Yuan Lei's Little Knowledge | Application Range of Calcium Carbonate in Coatings and Ink

Release time:

2024-01-29 09:34

Calcium carbonate is a non-toxic, tasteless, non-irritating white powder, is one of the most widely used inorganic filler. 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 the earth. It exists in aragonite, calcite, chalk, limestone, marble, travertine and other rocks. It is also the main component of animal bones or shells. Calcium carbonate is an important building material and is widely used in industry.



1. In latex paint

The role of heavy calcium

1) As a body pigment, it has a filling effect to make it delicate, uniform and high whiteness.

2) It has a certain dry hiding power. Generally, ultrafine products are used. When its particle size is close to that of titanium dioxide, the covering effect of titanium dioxide can be improved.

3) can improve the film strength, water resistance, dry, scrub resistance.

4) Improve color retention.

5) Reduce costs, the use of 10% to 50%. Disadvantages: high density, easy to precipitate, the amount of use should not be too large.

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, with a certain suspension, play the role of anti-settling.

4) Reduce costs.

5) increase the feel. Disadvantages: easy frosting, swelling, thickening, the amount should not be too large, can not be used in exterior wall coatings.



2. In powder coating

1) It can be used as a filler for high-gloss coating products.

2) Semi-gloss coating products, generally can be directly added to the preparation of calcium carbonate, without adding matting agent, cost savings.

3) It is a white inorganic pigment, which 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) can improve the coating powder rate and spraying area, especially in the mixed powder is more obvious.

6) If outdoor weather resistance is required, it cannot be used as a filler.

7) Because of 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) play a skeleton role, can increase the film thickness, improve the wear resistance and durability of the coating.



3、In wood coatings

1) as a colored primer filler, reduce costs.

2) increase the film strength, wear resistance.

3) light calcium has a little thickening effect, easy to change, good anti precipitation.

4) Heavy calcium in the paint film to reduce the grinding, easy to precipitate in the tank, pay attention to strengthen the anti-settling.

5) improve the film gloss, dry, whitening.

6) should not be used with alkali resistant pigments and fillers.


4. In car paint

The ultrafine calcium carbonate with particle size less than 80nm is used for anti-stone coating and topcoat of automobile chassis due to its good thixotropy. The market capacity is 7000~8000t/a, and the price is as high as 1100~1200 USD/t in the international market.


5, in the ink

Ultrafine calcium carbonate is used in ink, showing excellent dispersion, transparency, excellent gloss and hiding power, as well as excellent ink adsorption and drying, which must be activated, the crystal shape is spherical or cubic.


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