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Modifying method of yellowing-resistant calcium carbonate for automobile coating

A calcium carbonate and yellowing resistance technology, applied in the field of inorganic pigments, can solve the problems of uneven distribution of surface treatment agents, poor weather resistance of heavy calcium carbonate, easy yellowing of automotive coatings, etc., and achieve good chemical stability and good compatibility. The effect of stability and dispersibility, and low production cost

Inactive Publication Date: 2018-11-27
贺州钟山县双文碳酸钙新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to insufficient surface treatment agents or uneven distribution of surface treatment agents on the surface of calcium carbonate, the problem of calcium carbonate agglomeration still exists
Secondly, due to the poor weather resistance of heavy calcium carbonate, it is easy to yellow when applied to automotive coatings, which will affect the gloss.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A modification method of anti-yellowing calcium carbonate for automotive coatings, comprising the steps of:

[0027] (1) Put limestone into the pulverizer and pulverize until the particle size is ≤0.4mm to get calcium carbonate coarse powder:

[0028] (2) Add the coarse calcium carbonate powder to the grinder, and add the first modifier of 3% by weight of limestone, and grind for 1.5h at a rate of 1000r / min to obtain calcium carbonate fine powder with a particle size of 375 mesh; The first modifying agent is composed of pentaerythritol stearate and sodium di-sec-octyl maleate sulfonate with a mass ratio of 2:1.

[0029] (3) Transport the calcium carbonate fine powder to a high-speed mixer, and then add a second modifier of 1.5% by weight of limestone, which is composed of octaphenyl clathrate silsesquisil with a weight ratio of 1:1 Composed of oxane and castor oil maleate; stir at a high speed of 1200r / min for 15min, mix evenly, and dry at a temperature of 100°C to obt...

Embodiment 2

[0031] A modification method of anti-yellowing calcium carbonate for automotive coatings, comprising the steps of:

[0032] (1) Put the marble into the pulverizer and pulverize until the particle size is ≤0.4mm to get calcium carbonate coarse powder:

[0033] (2) Add coarse calcium carbonate powder to the grinding machine, and add the first modifier of 2.5% of the marble weight, and grind for 2.5 hours at a speed of 1200r / min to obtain calcium carbonate fine powder with a particle size of 400 mesh; The first modifying agent is composed of pentaerythritol stearate and sodium di-sec-octyl maleate sulfonate with a mass ratio of 1:1.

[0034] (3) Transport the calcium carbonate fine powder to a high-speed mixer, and then add a second modifier equal to 2% of the weight of the marble. The second modifier is composed of octaphenyl clathrate silsesquisil with a weight ratio of 1:3 Composed of oxane and castor oil maleate; stir at a high speed of 1000r / min for 10min, mix evenly, and d...

Embodiment 3

[0036] A modification method of anti-yellowing calcium carbonate for automotive coatings, comprising the steps of:

[0037] (1) Add calcite into a pulverizer and pulverize until the particle size is ≤0.4mm to obtain coarse calcium carbonate powder:

[0038] (2) Add the coarse calcium carbonate powder to the grinder, and add the first modifier which is 2% by weight of calcite, and grind for 1 hour at a rate of 1500r / min to obtain a fine calcium carbonate powder with a particle size of 300 meshes; The first modifier is composed of pentaerythritol stearate and sodium di-sec-octyl maleate sulfonate with a mass ratio of 1:1.

[0039] (3) Transport the calcium carbonate fine powder to a high-speed mixer, and then add a second modifier of 2.5% by weight of calcite, which is composed of octaphenyl clathrate silsesquisil with a weight ratio of 1:2 Composed of oxane and castor oil maleate; stir at a high speed of 800r / min for 20min, mix evenly, and dry at a temperature of 95°C to obtai...

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Abstract

The invention discloses a modifying method of yellowing-resistant calcium carbonate for an automobile coating. The modifying method comprises the following steps: adding the raw materials calcium carbonate into a crushing machine, and crushing the raw materials until the diameter is less than or equal to 0.4mm, so as to obtain calcium carbonate crude powder; adding the calcium carbonate crude powder into a grinding machine, adding a first modifying agent, and grinding, so as to obtain calcium carbonate fine powder with a particle size of 300-500 meshes; and conveying the calcium carbonate finepowder to a high-speed stirrer, adding a second modifying agent, stirring at a high speed for uniform mixing, and drying, so as to obtain modified calcium carbonate for the automobile coating, wherein the first modifying agent contains pentaerythritol stearate and sodium diethylhexyl sulfosuccinate, and the second modifying agent contains octaphenyl cage-like silsesquioxane and maleic acid ricinoleate. Calcium carbonate prepared by virtue of the modifying method has good dispersity, thixotropy, processing fluidity, adhesion force, chemical stability, oxidation resistance, weather resistance and heat resistance and can be widely applied to the automobile coating.

Description

technical field [0001] The invention belongs to the technical field of inorganic pigments, in particular to a method for modifying anti-yellowing calcium carbonate for automobile coatings. Background technique [0002] Calcium carbonate is an important inorganic chemical product, which is widely used in rubber, plastic, paper, paint, ink, medicine, automobile paint, cosmetics, food and other industries. However, due to the smaller the particle size of calcium carbonate particles and the more atoms on the surface, the higher the surface energy, the stronger the adsorption, and the mutual agglomeration between the particles; followed by calcium carbonate as an inorganic filler, the surface of the particles is hydrophilic and hydrophobic. Oil has poor affinity with organic polymers and is easy to form aggregates, resulting in internal defects of polymers and poor mechanical properties. In order to improve the filling performance of calcium carbonate, effective technology and s...

Claims

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Application Information

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IPC IPC(8): C09D7/62
CPCC08K9/04C08K2003/265C09D7/62
Inventor 唐文易双
Owner 贺州钟山县双文碳酸钙新材料有限公司