Application of calcium carbonate in coating industry
May 29, 2024, 11:58 AM
TDD-global
8578
Guide
Highlights at a glance
Calcium carbonate is a versatile, non-toxic filler used in various industries, including paints, coatings, and inks. It exists in multiple forms such as heavy and light calcium carbonate. This article discusses its roles as an extender pigment, cost reducer, and performance enhancer in different applications, highlighting its significance in enhancing product quality.
Calcium carbonate is a non-toxic, odorless, non-irritating white powder and one of the most versatile inorganic fillers. Calcium carbonate is neutral, basically insoluble in water, soluble in acid. According to the different production methods of calcium carbonate, calcium carbonate can be divided into heavy calcium carbonate, light calcium carbonate, colloidal calcium carbonate and crystalline calcium carbonate. Calcium carbonate is a common substance on earth, which exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks, and is also the main component of animal bones or shells. Calcium carbonate is an important building material and is widely used in industry.
Application of calcium carbonate in latex paint
1. The role of heavy calcium
(1) As an extender pigment, it has a filling effect, making it fine, uniform and high in whiteness.
(2) It has a certain dry covering power. Generally, ultra-fine products are used. When the particle size is close to the particle size of titanium dioxide, the covering effect of titanium dioxide can be improved.
(3) It can improve the strength, water resistance, dryness and scrub resistance of the paint film.
(4) Improve color retention.
(5) Reduce the cost, the usage is 10%~50%. Disadvantages: high density and easy precipitation, the usage amount should not be too large.
2. The role of light calcium
(1) As an extender pigment, it has a filling effect, is delicate, and increases whiteness.
(2) Has a certain dry covering power.
(3) The density is small, the specific surface area is large, and it has a certain degree of suspension, which plays an anti-settling effect.
(4) Reduce costs.
(5) Increase the feel. Disadvantages: It is easy to white frost, swell and thicken. The usage amount should not be too large, and it cannot be used in exterior wall coatings.
Application of Calcium Carbonate in Powder Coatings
(1) It can be used as a filler for high-gloss coating products.
(2) Semi-gloss coating products can generally be prepared by adding calcium carbonate directly, without adding a matting agent, saving costs.
(3) It is a white inorganic pigment and can be used in conjunction with titanium dioxide to reduce costs.
(4) Compared with other fillers, calcium carbonate is most suitable for some environmentally friendly products that require low heavy metal content, such as children's toys, strollers, etc.
(5) It can improve the powder coating rate and spraying area, especially when used in mixed powder.
(6) If outdoor weather resistance is required, it cannot be used as filler.
(7) Due to its high oil absorption, it is easy to cause orange peel on the surface of the paint film. At this time, a little hydrogenated castor oil can be added to the base material.
(8) It acts as a skeleton, which can increase the thickness of the paint film and improve the wear resistance and durability of the coating.
Application of calcium carbonate in wood coatings
(1) Used as a filler for colored primers to reduce costs.
(2) Increase the film strength and wear resistance.
(3) Light calcium has a little thickening effect, is easy to thixotrope, and has good anti-settling properties.
(4) Heavy calcium reduces the sandability in the paint film, and is easy to precipitate in the tank. Pay attention to strengthening the anti-settling property.
(5) Improve the gloss, dryness and whitening of the paint film.
(6) Not suitable for use with alkali-resistant pigments and fillers.
Application of calcium carbonate in automotive paint
Ultrafine calcium carbonate with a particle size of less than 80nm is used for anti-stone chipping coatings and topcoats for automobile chassis due to its good thixotropy. .
Application of calcium carbonate in ink
Ultrafine calcium carbonate is used in ink, showing excellent dispersibility, transparency, excellent gloss and hiding power, as well as excellent ink adsorption and drying. It must be activated and the crystal form is spherical or cubic.
1. The role of heavy calcium
(1) As an extender pigment, it has a filling effect, making it fine, uniform and high in whiteness.
(2) It has a certain dry covering power. Generally, ultra-fine products are used. When the particle size is close to the particle size of titanium dioxide, the covering effect of titanium dioxide can be improved.
(3) It can improve the strength, water resistance, dryness and scrub resistance of the paint film.
(4) Improve color retention.
(5) Reduce the cost, the usage is 10%~50%. Disadvantages: high density and easy precipitation, the usage amount should not be too large.
2. The role of light calcium
(1) As an extender pigment, it has a filling effect, is delicate, and increases whiteness.
(2) Has a certain dry covering power.
(3) The density is small, the specific surface area is large, and it has a certain degree of suspension, which plays an anti-settling effect.
(4) Reduce costs.
(5) Increase the feel. Disadvantages: It is easy to white frost, swell and thicken. The usage amount should not be too large, and it cannot be used in exterior wall coatings.
(1) It can be used as a filler for high-gloss coating products.
(2) Semi-gloss coating products can generally be prepared by adding calcium carbonate directly, without adding a matting agent, saving costs.
(3) It is a white inorganic pigment and can be used in conjunction with titanium dioxide to reduce costs.
(4) Compared with other fillers, calcium carbonate is most suitable for some environmentally friendly products that require low heavy metal content, such as children's toys, strollers, etc.
(5) It can improve the powder coating rate and spraying area, especially when used in mixed powder.
(6) If outdoor weather resistance is required, it cannot be used as filler.
(7) Due to its high oil absorption, it is easy to cause orange peel on the surface of the paint film. At this time, a little hydrogenated castor oil can be added to the base material.
(8) It acts as a skeleton, which can increase the thickness of the paint film and improve the wear resistance and durability of the coating.
Application of calcium carbonate in wood coatings
(1) Used as a filler for colored primers to reduce costs.
(2) Increase the film strength and wear resistance.
(3) Light calcium has a little thickening effect, is easy to thixotrope, and has good anti-settling properties.
(4) Heavy calcium reduces the sandability in the paint film, and is easy to precipitate in the tank. Pay attention to strengthening the anti-settling property.
(5) Improve the gloss, dryness and whitening of the paint film.
(6) Not suitable for use with alkali-resistant pigments and fillers.
Ultrafine calcium carbonate with a particle size of less than 80nm is used for anti-stone chipping coatings and topcoats for automobile chassis due to its good thixotropy. .
Application of calcium carbonate in ink
Ultrafine calcium carbonate is used in ink, showing excellent dispersibility, transparency, excellent gloss and hiding power, as well as excellent ink adsorption and drying. It must be activated and the crystal form is spherical or cubic.
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