Introduction of metallic powder coatings (formula)

Metal effect powder coatings (hereinafter referred to as metal powder) in the entire application of decorative painting is more and more widely, is the mainstream of art powder.

Can be used for the metal pigment powder coating has many varieties, generally divided into four categories, namely aluminum powder pigment, pearlescent pigment, bronze powder pigments and other metal pigments (such as nickel powder, stainless steel powder etc.). Each kind of metal pigment and contains many color products, used in powder, the powder is colorful, greatly enriched the varieties and decorative powder coatings.

The metal powder is mainly applied to indoor and outdoor furniture, lamps, metal crafts, lampblack machine, baby stroller, sports equipment and other industries.

- aluminum powder

Aluminum powder is divided into two types of floating and non floating. When the floating type aluminum powder is added into the powder coating, the continuous phase can be formed on the surface of the coating after baking, and sometimes a mirror surface effect is formed.

Flash non floating aluminum powder

This kind of aluminum powder usually has a particle size of 20 mu m. The surface of the powder is usually coated with the coating material. The smaller the size of the non floating aluminum powder, the better the flicker effect. Because of its surface coating, with good acid and alkali, there is a certain outdoor durability.

The powder coating of the non floating type aluminum powder can be sprayed with the high requirement of the shell of the washing machine and the engine of the motorcycle. After the addition of mixed non floating aluminum powder is very wide, about 10% of the amount of powder coating is not much influence. The application of domestic non floating aluminium powder factory is a popular German love card's PCR series products.

The application of floating aluminum powder in powder coating is more popular.

The floating type aluminum powder was observed under high power microscope, and the average particle size is less than 20 mu m, the smaller the particle size is, the greater the hiding power is.

The strongest sense should be chrome plated metal, metal powder of this effect is the most popular in the current market, the effect of chrome powder coating development and production must start from the bottom and the choice of aluminum powder formula, formula 1 can be used as a reference.

Formula 1

Material name notes

P6060 45 DSM resin, 55mgKOH/g acid

E-12 25 epoxy resin,

GLP503 5 leveling agent

BENZOIN 0.5 anti foam agent

TiO2 3.5 rutile titanium dioxide

WAX 0.5 PE wax

BaSO4 21 ultrafine barium sulfate

Black C 0.0012 carbon black

Formula 1 Selection of P6060, is due to the melt viscosity of the resin is very small, with E-12 type epoxy compatibility of the production of the bottom powder flow roughness is high, the gloss is also very high. The effect of wax is mainly to improve the scratch resistance of the powder surface.

To get the mirror effect, must choose the appropriate powder, PC100 and Bandelu Eckart recommended company (BENDA-LUTZ), AL2081, the general added ratio of 1.5%, adding too high to produce spit powder and spray gun head clogging phenomenon, low dosage no mirror effect.

For other particle size of floating aluminum powder (particle size is mostly in 10~20 m), the proportion of 1.5%~2.0% can also get a very good silver effect. This kind of powder addition is smaller (such as < 1%), the amount of aluminum is less, can not fully cover the bottom powder, frequent flooding, sometimes appear fine lines.

- Art powder coating mainly uses floating aluminum powder

The fine arts here mainly for sand grains, hammer lines, wrinkles (continuous paint) and cracks and other powder coatings. The typical art powder black powder for honeysuckle, bottom hammer, in accordance with the production process, produce hammer powder mainly have two methods, one is added after the two is the flower floating agent, squeeze hammer agent.

With the use of the method of producing fine arts powder, the pattern is easy to adjust, but the appearance is poor, the spraying process is easy to produce uneven pattern distribution, the recycling of powder is very difficult.

If the process is well mastered, the pattern of regular and beautiful appearance can be obtained, and the three-dimensional sense is strong, the pattern is uniform in each part of the work piece, and the recovery and utilization rate of the powder is high. Recommended formula 2.

Formula 2

Material name notes

56 mixed type polyester polyester with low acid value, acid value 35mgKOH/g

E-12 24604 epoxy, equivalent 750,

Cab-551-0.2 0.045 acetate butyl cellulose,

WAX 0.3 PE wax

Filler 20 can be selected calcium carbonate or barium sulfate

Black C 1 blue phase carbon black

Because it is inside the squeeze hammer, pattern in the extrusion stage, namely the basic shape, so the control of the extrusion condition is very important. Cellulose acetate butyrate melting point of 140 degrees Celsius, extrusion temperature has obvious influence on the dispersion of different, it added in the proportion of the powder also has great influence on the general pattern, adding amount is less than 0.035%, the pattern will be great, easy to open at the end; adding amount of more than 0.08%, the pattern will be smaller and stable.

Join the 0.3%~0.5% float type aluminum powder in the bottom, such as Su lunk PP1170, you can get a clear pattern, no confusion, stereoscopic effect strong black silver.

Formula 2 for high gloss metallic powder. Metal powder without light type is also very popular, but the production patterns in the without light type aluminum silver beautiful has technical difficulty. If the use of internal extrusion process, due to the high viscosity of the base powder, the dispersion of the hammer and the solidification of the flow is limited, so the pattern is usually not regular, the pattern is also small.

So the development of large pattern and beautiful light type aluminium powder, must be adjusted in the bottom of the powder, the method can be used in the formula is, adding hydroxyl polyester and epoxy resin, use it as incompatible, to reduce the amount of flatting agent, the viscosity of the base powder is reduced properly or adding low the viscosity in the formulations of carboxyl polyester joined 15%~20% CE1099, usually as long as you can get larger patterns, such as the reference formula shown in Formula 3 and formula 4.

Formula 3

Material name notes

E-12 50 epoxy resin,

EL-1200 25 hydroxy resin,

603-1A 4.5 extinction agent,

Wax 0.3 PE wax

BaSO4 20 thick barium sulfate

Black C 1 carbon black

Formula 4

Material name notes

E-12 55 epoxy resin

CE-1099 20 low acid value of polyester,

P-68 4.8 extinction agent,

Wax 0.3 PE wax

BaSO4 19 thick barium sulfate

Black C 1 carbon black

Formula 3 and 4 of the baking condition is 200 c /10min (metal substrate temperature), the bottom powder gloss < 5%.

After the above two kinds of bottom powder mixed powder and floating agent are easy to get a larger pattern, but there is a slight difference in the three-dimensional sense and pattern shape. Recommend the use of Su lunk's aluminum PP1170, the proportion is about 0.5%. The dosage of floating agent depends on the situation. Floating agent for flower varieties is very important to select the best one, more crushing, using the mesh coarse sieve, keep some coarse powder.

- other fine arts (sand grain powder or paint)

After adding aluminum powder. The general effect is not too obvious, this is because their pattern is very fine, the aluminum is not fully aligned, shiny caused by weakened or inhibited the. The production of this kind of art powder is relatively easy.

- pearl powder coating

Pearlescent pigments with flash effect similar to the natural pearl shells, fish, birds, etc., is a conventional pigment cannot replace.

Pearlescent pigment from fish is made, then gradually emerged artificial synthesis of silver chloride, carbonate lead and arsenic compounds of this series pearlescent pigment, pearlescent pigment due to toxicity is too large, the use scope is strictly limited.

Now the general promotion for the series of pearly pigment of mica titanium mica and iron, is non-toxic, good light stability, color rich, excellent comprehensive performance.

Pearlescent pigment rich hue, in accordance with the color can be divided into white, iridescent (interference color), color yellow, metal (bronze, red, purple, bronze etc.) four.

Technical personnel in the adjustment formula, must consider the pearlescent pigment's color and size stability, otherwise it will affect the color and quality of the final product.

Hammer - bronze powder

High gloss, bottom powder with formula 2, mixed pearlescent pigment F-052, dosage of 0.8%~1.0%.

No light, the bottom powder by formula 3 or 4, after adding F-050 pearlescent pigment (the amount of 0.5%), or F-052 (the amount of 0.8%), as well as the floating agent of flower (the amount of 0.5%).

Pine green hammer powder

High gloss, bottom powder with formula 2, what pigment G-035, dosage of 0.8%~1.0%.

No light, using formula 3 or 4 beads, pigment G-035, dosage of 1.0%~1.4%, dosage of 0.6% floating flowers.

Purple Satin hammer powder

High gloss, bottom powder with formula 2, what pigment G-019, dosage of 0.8%~1.0%.

No light type, available formula 3 or 4 as the base powder, beads pigment G-019, dosage of 1.2%~1.5%, dosage of 0.5% floating flowers.

- gold sand grain powder

The black sand grains are used as the bottom powder and the recommended formula is 5.

Formula 5

Material name notes

58 pure polyester polyester with low acid value, acid value 35mgKOH/g

T105M 3.2 HMMA type curing agent,

PV-88 0.12 silica adsorption type pure leveling agent

TF-1830 1.5 sand grain agent

Wax 0.6 PE wax

BP-881 1.2 organic bentonite

BaSO4 35 precipitated barium sulfate or barite

Black C 1 carbon black

The effect of the gold base powder directly after the mixed 2.5% H-030 pearlescent pigment can obtain elegant.

Many varieties of pearl pigment, can easily bring up all kinds of color powder, flashing non float type aluminum silver series pearlescent pigments, in strong acid and alkali resistant occasions to the selection of pearlescent pigment. In addition to the requirements of good weather resistance powder case, should give priority to the pearlescent pigment.

- copper gold powder

For copper and gold powder paint is not actually gold, is the main component of copper, and obtain a variety of hue because doped with different ratios of zinc or tin, adding powder coating, can take effect from the golden silk until thick bright.

Copper gold powder soft, warm color, simple and beautiful, and more for metal furniture, lamps and crafts of painting.

Selection of bronze powder in hue, to consider its heat resistance. Bronze powder pigment can be directly mixed with the bottom powder, adding ratio depends on the specific circumstances, the color and flash of pearlescent pigment is weaker than.

Process points of metal powder coatings

Metallic pigment selection tips

And don't try to float type aluminum for alkali occasions.

Ordinary copper gold powder is not temperature, the application should be done before the test.

Floating aluminum powder and copper powder can not be used for weather.

According to the existing experience, aluminum and copper powder as far as possible the choice of imported products, so as to better ensure the stability of powder quality.

Recipe adjustment tips

In the plane type metal powder, to fully display the metal effect, should be appropriate to increase the proportion of the resin in the base powder, the amount of leveling agent can also be increased. Fill the best choice of barium sulfate, and the smaller the size of the better.

Extrusion process must be to prevent the production of small depressions, which is due to the high resin in the formula, low viscosity, easy to be caused by interference, or in the mixed metal powder will occur when the flower.

A transparent or translucent powder base powder, adding metal powder, must pay attention to the metal pigment covering ability, lack of hiding power, in the spraying complex workpiece is easy to appear when open at the end of the cross or the corner.

Under normal circumstances, the amount of metal pigment added to a certain extent, floating aluminum powder should be less than 2%, non floating aluminum powder to add a higher proportion of (8%~10%). Pearlescent pigments dosage should be less than 3%, and the amount of copper powder and no-floating aluminium powder similar proportion allows higher.

After the metal pigment wetting and agglomeration are not suitable for use in.

Metal powder, hammer type, in development or production, should be more understanding of the customer's workpiece shape and thickness and curing conditions, according to the customer's specific circumstances to adjust the pattern, otherwise there will be inconsistent with the pattern of customer requirements.

The amount of wax should be added to the bottom powder to increase the scratch resistance of the coating.

In addition to special requirements, the metal pigments as far as possible not to squeeze out with the bottom powder, as will seriously damage the metal effect.

Post mixing process

The post mixing process of metal powder is an important factor to determine the quality of the powder.

Sand grains, hammer grains metal powder is relatively easy, and sometimes manual stirring for a few minutes, the effect can also be. But for the flat silver metal powder, how stable according to the standard model for the production bottleneck is currently restricted many powder factory.

For the finished powder mixed mechanical equipment has several, from mixed mode can be divided into: mixing, stirring, overturned overturned type and mixed type and help set machine.

The powder factory is widely used in high speed mixing tank and drum (with I-shaped paddle mixer, V mixer) and three rotating water-cooled type mixer, this several mixing equipment has its own characteristics.

Research and development of metal effect of powder coatings, must grasp several key factors, one is the recipe to be reasonable, two is to strictly control the production process, third is the need to have the appropriate product mix.

Introduction of metallic powder coatings (formula)

Metal effect powder coatings (hereinafter referred to as metal powder) in the entire application of decorative painting is more and more widely, is the mainstream of art powder.

Can be used for the metal pigment powder coating has many varieties, generally divided into four categories, namely aluminum powder pigment, pearlescent pigment, bronze powder pigments and other metal pigments (such as nickel powder, stainless steel powder etc.). Each kind of metal pigment and contains many color products, used in powder, the powder is colorful, greatly enriched the varieties and decorative powder coatings.

The metal powder is mainly applied to indoor and outdoor furniture, lamps, metal crafts, lampblack machine, baby stroller, sports equipment and other industries.

- aluminum powder

Aluminum powder is divided into two types of floating and non floating. When the floating type aluminum powder is added into the powder coating, the continuous phase can be formed on the surface of the coating after baking, and sometimes a mirror surface effect is formed.

Flash non floating aluminum powder

This kind of aluminum powder usually has a particle size of 20 mu m. The surface of the powder is usually coated with the coating material. The smaller the size of the non floating aluminum powder, the better the flicker effect. Because of its surface coating, with good acid and alkali, there is a certain outdoor durability.

The powder coating of the non floating type aluminum powder can be sprayed with the high requirement of the shell of the washing machine and the engine of the motorcycle. After the addition of mixed non floating aluminum powder is very wide, about 10% of the amount of powder coating is not much influence. The application of domestic non floating aluminium powder factory is a popular German love card's PCR series products.

The application of floating aluminum powder in powder coating is more popular.

The floating type aluminum powder was observed under high power microscope, and the average particle size is less than 20 mu m, the smaller the particle size is, the greater the hiding power is.

The strongest sense should be chrome plated metal, metal powder of this effect is the most popular in the current market, the effect of chrome powder coating development and production must start from the bottom and the choice of aluminum powder formula, formula 1 can be used as a reference.

Formula 1

Material name notes

P6060 45 DSM resin, 55mgKOH/g acid

E-12 25 epoxy resin,

GLP5035 leveling agent

BENZOIN 0.5 anti foam agent

TiO2 3.5 rutile titanium dioxide

WAX 0.5 PE wax

BaSO4 21 ultrafine barium sulfate

Black C 0.0012 carbon black

Formula 1 Selection of P6060, is due to the melt viscosity of the resin is very small, with E-12 type epoxy compatibility of the production of the bottom powder flow roughness is high, the gloss is also very high. The effect of wax is mainly to improve the scratch resistance of the powder surface.

To get the mirror effect, must choose the appropriate powder, PC100 and Bandelu Eckart recommended company (BENDA-LUTZ), AL2081, the general added ratio of 1.5%, adding too high to produce spit powder and spray gun head clogging phenomenon, low dosage no mirror effect.

For other particle size of floating aluminum powder (particle size is mostly in 10~20 m), the proportion of 1.5%~2.0% can also get a very good silver effect. This kind of powder addition is smaller (such as < 1%), the amount of aluminum is less, can not fully cover the bottom powder, frequent flooding, sometimes appear fine lines.

- Art powder coating mainly uses floating aluminum powder

The fine arts here mainly for sand grains, hammer lines, wrinkles (continuous paint) and cracks and other powder coatings. The typical art powder black powder for honeysuckle, bottom hammer, in accordance with the production process, produce hammer powder mainly have two methods, one is added after the two is the flower floating agent, squeeze hammer agent.

With the use of the method of producing fine arts powder, the pattern is easy to adjust, but the appearance is poor, the spraying process is easy to produce uneven pattern distribution, the recycling of powder is very difficult.

If the process is well mastered, the pattern of regular and beautiful appearance can be obtained, and the three-dimensional sense is strong, the pattern is uniform in each part of the work piece, and the recovery and utilization rate of the powder is high. Recommended formula 2.

Formula 2

Material name notes

56 mixed type polyester polyester with low acid value, acid value 35mgKOH/g

E-12 24604 epoxy, equivalent 750,

Cab-551-0.2 0.045 acetate butyl cellulose,

WAX 0.3 PE wax

Filler 20 can be selected calcium carbonate or barium sulfate

Black C 1 blue phase carbon black

Because it is inside the squeeze hammer, pattern in the extrusion stage, namely the basic shape, so the control of the extrusion condition is very important. Cellulose acetate butyrate melting point of 140 degrees Celsius, extrusion temperature has obvious influence on the dispersion of different, it added in the proportion of the powder also has great influence on the general pattern, adding amount is less than 0.035%, the pattern will be great, easy to open at the end; adding amount of more than 0.08%, the pattern will be smaller and stable.

Join the 0.3%~0.5% float type aluminum powder in the bottom, such as Su lunk PP1170, you can get a clear pattern, no confusion, stereoscopic effect strong black silver.

Formula 2 for high gloss metallic powder. Metal powder without light type is also very popular, but the production patterns in the without light type aluminum silver beautiful has technical difficulty. If the use of internal extrusion process, due to the high viscosity of the base powder, the dispersion of the hammer and the solidification of the flow is limited, so the pattern is usually not regular, the pattern is also small.

So the development of large pattern and beautiful light type aluminium powder, must be adjusted in the bottom of the powder, the method can be used in the formula is, adding hydroxyl polyester and epoxy resin, use it as incompatible, to reduce the amount of flatting agent, the viscosity of the base powder is reduced properly or adding low the viscosity in the formulations of carboxyl polyester joined 15%~20% CE1099, usually as long as you can get larger patterns, such as the reference formula shown in Formula 3 and formula 4.

Formula 3

Material name notes

E-12 50 epoxy resin,

EL-1200 25 hydroxy resin,

603-1A 4.5 extinction agent,

Wax 0.3 PE wax

BaSO4 20 thick barium sulfate

Black C 1 carbon black

Formula 4

Material name notes

E-12 55 epoxy resin

CE-1099 20 low acid value of polyester,

P-68 4.8 extinction agent,

Wax 0.3 PE wax

BaSO4 19 thick barium sulfate

Black C 1 carbon black

Formula 3 and 4 of the baking condition is 200 c /10min (metal substrate temperature), the bottom powder gloss < 5%.

After the above two kinds of bottom powder mixed powder and floating agent are easy to get a larger pattern, but there is a slight difference in the three-dimensional sense and pattern shape. Recommend the use of Su lunk's aluminum PP1170, the proportion is about 0.5%. The dosage of floating agent depends on the situation. Floating agent for flower varieties is very important to select the best one, more crushing, using the mesh coarse sieve, keep some coarse powder.

- other fine arts (sand grain powder or paint)

After adding aluminum powder. The general effect is not too obvious, this is because their pattern is very fine, the aluminum is not fully aligned, shiny caused by weakened or inhibited the. The production of this kind of art powder is relatively easy.

- pearl powder coating

Pearlescent pigments with flash effect similar to the natural pearl shells, fish, birds, etc., is a conventional pigment cannot replace.

Pearlescent pigment from fish is made, then gradually emerged artificial synthesis of silver chloride, carbonate lead and arsenic compounds of this series pearlescent pigment, pearlescent pigment due to toxicity is too large, the use scope is strictly limited.

Now the general promotion for the series of pearly pigment of mica titanium mica and iron, is non-toxic, good light stability, color rich, excellent comprehensive performance.

Pearlescent pigment rich hue, in accordance with the color can be divided into white, iridescent (interference color), color yellow, metal (bronze, red, purple, bronze etc.) four.

Technical personnel in the adjustment formula, must consider the pearlescent pigment's color and size stability, otherwise it will affect the color and quality of the final product.

Hammer - bronze powder

High gloss, bottom powder with formula 2, mixed pearlescent pigment F-052, dosage of 0.8%~1.0%.

No light, the bottom powder by formula 3 or 4, after adding F-050 pearlescent pigment (the amount of 0.5%), or F-052 (the amount of 0.8%), as well as the floating agent of flower (the amount of 0.5%).

Pine green hammer powder

High gloss, bottom powder with formula 2, what pigment G-035, dosage of 0.8%~1.0%.

No light, using formula 3 or 4 beads, pigment G-035, dosage of 1.0%~1.4%, dosage of 0.6% floating flowers.

Purple Satin hammer powder

High gloss, bottom powder with formula 2, what pigment G-019, dosage of 0.8%~1.0%.

No light type, available formula 3 or 4 as the base powder, beads pigment G-019, dosage of 1.2%~1.5%, dosage of 0.5% floating flowers.

- gold sand grain powder

The black sand grains are used as the bottom powder and the recommended formula is 5.

Formula 5

Material name notes

58 pure polyester polyester with low acid value, acid value 35mgKOH/g

T105M 3.2 HMMA type curing agent,

PV-88 0.12 silica adsorption type pure leveling agent

TF-1830 1.5 sand grain agent

Wax 0.6 PE wax

BP-881 1.2 organic bentonite

BaSO4 35 precipitated barium sulfate or barite

Black C 1 carbon black

The effect of the gold base powder directly after the mixed 2.5% H-030 pearlescent pigment can obtain elegant.

Many varieties of pearl pigment, can easily bring up all kinds of color powder, flashing non float type aluminum silver series pearlescent pigments, in strong acid and alkali resistant occasions to the selection of pearlescent pigment. In addition to the requirements of good weather resistance powder case, should give priority to the pearlescent pigment.

- copper gold powder

For copper and gold powder paint is not actually gold, is the main component of copper, and obtain a variety of hue because doped with different ratios of zinc or tin, adding powder coating, can take effect from the golden silk until thick bright.

Copper gold powder soft, warm color, simple and beautiful, and more for metal furniture, lamps and crafts of painting.

Selection of bronze powder in hue, to consider its heat resistance. Bronze powder pigment can be directly mixed with the bottom powder, adding ratio depends on the specific circumstances, the color and flash of pearlescent pigment is weaker than.

Process points of metal powder coatings

Metallic pigment selection tips

And don't try to float type aluminum for alkali occasions.

Ordinary copper gold powder is not temperature, the application should be done before the test.

Floating aluminum powder and copper powder can not be used for weather.

According to the existing experience, aluminum and copper powder as far as possible the choice of imported products, so as to better ensure the stability of powder quality.

Recipe adjustment tips

In the plane type metal powder, to fully display the metal effect, should be appropriate to increase the proportion of the resin in the base powder, the amount of leveling agent can also be increased. Fill the best choice of barium sulfate, and the smaller the size of the better.

Extrusion process must be to prevent the production of small depressions, which is due to the high resin in the formula, low viscosity, easy to be caused by interference, or in the mixed metal powder will occur when the flower.

A transparent or translucent powder base powder, adding metal powder, must pay attention to the metal pigment covering ability, lack of hiding power, in the spraying complex workpiece is easy to appear when open at the end of the cross or the corner.

Under normal circumstances, the amount of metal pigment added to a certain extent, floating aluminum powder should be less than 2%, non floating aluminum powder to add a higher proportion of (8%~10%). Pearlescent pigments dosage should be less than 3%, and the amount of copper powder and no-floating aluminium powder similar proportion allows higher.

After the metal pigment wetting and agglomeration are not suitable for use in.

Metal powder, hammer type, in development or production, should be more understanding of the customer's workpiece shape and thickness and curing conditions, according to the customer's specific circumstances to adjust the pattern, otherwise there will be inconsistent with the pattern of customer requirements.

The amount of wax should be added to the bottom powder to increase the scratch resistance of the coating.

In addition to special requirements, the metal pigments as far as possible not to squeeze out with the bottom powder, as will seriously damage the metal effect.

Post mixing process

The post mixing process of metal powder is an important factor to determine the quality of the powder.

Sand grains, hammer grains metal powder is relatively easy, and sometimes manual stirring for a few minutes, the effect can also be. But for the flat silver metal powder, how stable according to the standard model for the production bottleneck is currently restricted many powder factory.

For the finished powder mixed mechanical equipment has several, from mixed mode can be divided into: mixing, stirring, overturned overturned type and mixed type and help set machine.

The powder factory is widely used in high speed mixing tank and drum (with I-shaped paddle mixer, V mixer) and three rotating water-cooled type mixer, this several mixing equipment has its own characteristics.

Research and development of metal effect of powder coatings, must grasp several key factors, one is the recipe to be reasonable, two is to strictly control the production process, third is the need to have the appropriate product mix.

Metal effect powder coatings (hereinafter referred to as metal powder) in the entire application of decorative painting is more and more widely, is the mainstream of art powder.

Can be used for the metal pigment powder coating has many varieties, generally divided into four categories, namely aluminum powder pigment, pearlescent pigment, bronze powder pigments and other metal pigments (such as nickel powder, stainless steel powder etc.). Each kind of metal pigment and contains many color products, used in powder, the powder is colorful, greatly enriched the varieties and decorative powder coatings.

The metal powder is mainly applied to indoor and outdoor furniture, lamps, metal crafts, lampblack machine, baby stroller, sports equipment and other industries.

- aluminum powder

Aluminum powder is divided into two types of floating and non floating. When the floating type aluminum powder is added into the powder coating, the continuous phase can be formed on the surface of the coating after baking, and sometimes a mirror surface effect is formed.

Flash non floating aluminum powder

This kind of aluminum powder usually has a particle size of 20 mu m. The surface of the powder is usually coated with the coating material. The smaller the size of the non floating aluminum powder, the better the flicker effect. Because of its surface coating, with good acid and alkali, there is a certain outdoor durability.

The powder coating of the non floating type aluminum powder can be sprayed with the high requirement of the shell of the washing machine and the engine of the motorcycle. After the addition of mixed non floating aluminum powder is very wide, about 10% of the amount of powder coating is not much influence. The application of domestic non floating aluminium powder factory is a popular German love card's PCR series products.

The application of floating aluminum powder in powder coating is more popular.

The floating type aluminum powder was observed under high power microscope, and the average particle size is less than 20 mu m, the smaller the particle size is, the greater the hiding power is.

The strongest sense should be chrome plated metal, metal powder of this effect is the most popular in the current market, the effect of chrome powder coating development and production must start from the bottom and the choice of aluminum powder formula, formula 1 can be used as a reference.

Formula 1

Material name notes

P6060 45 DSM resin, 55mgKOH/g acid

E-12 25 epoxy resin,

GLP503 5 leveling agent

BENZOIN 0.5 anti foam agent

TiO2 3.5 rutile titanium dioxide

WAX 0.5 PE wax

BaSO4 21 ultrafine barium sulfate

Black C 0.0012 carbon black

Formula 1 Selection of P6060, is due to the melt viscosity of the resin is very small, with E-12 type epoxy compatibility of the production of the bottom powder flow roughness is high, the gloss is also very high. The effect of wax is mainly to improve the scratch resistance of the powder surface.

To get the mirror effect, must choose the appropriate powder, PC100 and Bandelu Eckart recommended company (BENDA-LUTZ), AL2081, the general added ratio of 1.5%, adding too high to produce spit powder and spray gun head clogging phenomenon, low dosage no mirror effect.

For other particle size of floating aluminum powder (particle size is mostly in 10~20 m), the proportion of 1.5%~2.0% can also get a very good silver effect. This kind of powder addition is smaller (such as < 1%), the amount of aluminum is less, can not fully cover the bottom powder, frequent flooding, sometimes appear fine lines.

- Art powder coating mainly uses floating aluminum powder

The fine arts here mainly for sand grains, hammer lines, wrinkles (continuous paint) and cracks and other powder coatings. The typical art powder black powder for honeysuckle, bottom hammer, in accordance with the production process, produce hammer powder mainly have two methods, one is added after the two is the flower floating agent, squeeze hammer agent.

With the use of the method of producing fine arts powder, the pattern is easy to adjust, but the appearance is poor, the spraying process is easy to produce uneven pattern distribution, the recycling of powder is very difficult.

If the process is well mastered, the pattern of regular and beautiful appearance can be obtained, and the three-dimensional sense is strong, the pattern is uniform in each part of the work piece, and the recovery and utilization rate of the powder is high. Recommended formula 2.

Formula 2

Material name notes

56 mixed type polyester polyester with low acid value, acid value 35mgKOH/g

E-12 24604 epoxy, equivalent 750,

Cab-551-0.2 0.045 acetate butyl cellulose,

WAX 0.3 PE wax

Filler 20 can be selected calcium carbonate or barium sulfate

Black C 1 blue phase carbon black

Because it is inside the squeeze hammer, pattern in the extrusion stage, namely the basic shape, so the control of the extrusion condition is very important. Cellulose acetate butyrate melting point of 140 degrees Celsius, extrusion temperature has obvious influence on the dispersion of different, it added in the proportion of the powder also has great influence on the general pattern, adding amount is less than 0.035%, the pattern will be great, easy to open at the end; adding amount of more than 0.08%, the pattern will be smaller and stable.

Join the 0.3%~0.5% float type aluminum powder in the bottom, such as Su lunk PP1170, you can get a clear pattern, no confusion, stereoscopic effect strong black silver.

Formula 2 for high gloss metallic powder. Metal powder without light type is also very popular, but the production patterns in the without light type aluminum silver beautiful has technical difficulty. If the use of internal extrusion process, due to the high viscosity of the base powder, the dispersion of the hammer and the solidification of the flow is limited, so the pattern is usually not regular, the pattern is also small.

So the development of large pattern and beautiful light type aluminium powder, must be adjusted in the bottom of the powder, the method can be used in the formula is, adding hydroxyl polyester and epoxy resin, use it as incompatible, to reduce the amount of flatting agent, the viscosity of the base powder is reduced properly or adding low the viscosity in the formulations of carboxyl polyester joined 15%~20% CE1099, usually as long as you can get larger patterns, such as the reference formula shown in Formula 3 and formula 4.

Formula 3

Material name notes

E-12 50 epoxy resin,

EL-1200 25 hydroxy resin,

603-1A 4.5 extinction agent,

Wax 0.3 PE wax

BaSO4 20 thick barium sulfate

Black C 1 carbon black

Formula 4

Material name notes

E-12 55 epoxy resin

CE-1099 20 low acid value of polyester,

P-68 4.8 extinction agent,

Wax 0.3 PE wax

BaSO4 19 thick barium sulfate

Black C 1 carbon black

Formula 3 and 4 of the baking condition is 200 c /10min (metal substrate temperature), the bottom powder gloss < 5%.

After the above two kinds of bottom powder mixed powder and floating agent are easy to get a larger pattern, but there is a slight difference in the three-dimensional sense and pattern shape. Recommend the use of Su lunk's aluminum PP1170, the proportion is about 0.5%. The dosage of floating agent depends on the situation. Floating agent for flower varieties is very important to select the best one, more crushing, using the mesh coarse sieve, keep some coarse powder.

- other fine arts (sand grain powder or paint)

After adding aluminum powder. The general effect is not too obvious, this is because their pattern is very fine, the aluminum is not fully aligned, shiny caused by weakened or inhibited the. The production of this kind of art powder is relatively easy.

- pearl powder coating

Pearlescent pigments with flash effect similar to the natural pearl shells, fish, birds, etc., is a conventional pigment cannot replace.

Pearlescent pigment from fish is made, then gradually emerged artificial synthesis of silver chloride, carbonate lead and arsenic compounds of this series pearlescent pigment, pearlescent pigment due to toxicity is too large, the use scope is strictly limited.

Now the general promotion for the series of pearly pigment of mica titanium mica and iron, is non-toxic, good light stability, color rich, excellent comprehensive performance.

Pearlescent pigment rich hue, in accordance with the color can be divided into white, iridescent (interference color), color yellow, metal (bronze, red, purple, bronze etc.) four.

Technical personnel in the adjustment formula, must consider the pearlescent pigment's color and size stability, otherwise it will affect the color and quality of the final product.

Hammer - bronze powder

High gloss, bottom powder with formula 2, mixed pearlescent pigment F-052, dosage of 0.8%~1.0%.

No light, the bottom powder by formula 3 or 4, after adding F-050 pearlescent pigment (the amount of 0.5%), or F-052 (the amount of 0.8%), as well as the floating agent of flower (the amount of 0.5%).