Method for preparing titanium dioxide-coated ground calcium carbonate powdered inorganic filler

A technology of heavy calcium carbonate and titanium dioxide, which is applied in fibrous fillers, inorganic pigment treatment, chemical instruments and methods, etc., can solve problems such as insufficient whiteness and poor acid resistance of heavy calcium carbonate, and achieve product quality assurance and pollution-free The effect of small size and simple process

Active Publication Date: 2015-01-21
HUNAN LEIXIN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, heavy calcium carbonate has poor acid resistance and whiteness is not as good as titanium dio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Stir 500 kg of water in a mixing tank, gradually disperse 500 kg of heavy calcium carbonate in the water, and add 10 kg of acetylacetone. The stirring speed was maintained at 1000 rpm. After stirring evenly, it was put into a grinder, and 85 kg of tetrabutyl titanate was added dropwise. After the dropwise addition, the stirring was continued for 0.5 hours. Grind and filter. The filtered heavy calcium carbonate is dried and pulverized once in a large flash dryer.

example 2

[0019] The preparation method of this titanium dioxide coated ground calcium carbonate powdery inorganic filler, the steps are as follows:

[0020] 1. Preparation of heavy calcium carbonate slurry:

[0021] Gradually add 100 parts by mass of 1500 mesh calcium carbonate powder to 100 parts of water, then add calcium carbonate and 1% acetylacetone of the total mass of water, namely AcAc, and keep the stirring speed at 1000 rpm until the stirring is uniform ;

[0022] At the same time, titanium dioxide is added to the slurry, the mass fraction is 4 powders, and the particle size of the titanium dioxide is 3000 mesh.

[0023] Second, the coating of heavy calcium carbonate:

[0024] The coating of heavy calcium carbonate is carried out in a grinder, and the stirring speed is maintained at 1000 rpm, and 17 parts by mass of butyl titanate are slowly added dropwise. After the dropwise addition, continue to grind for 0.5 hours. In the process, under the action of acetylacetone, b...

Embodiment 3

[0028] In step 2, during grinding, slowly add the dispersant dropwise, the amount of the dispersant is 1% of the total mass of calcium carbonate and water, among the dispersant, polycarboxylate sodium salt type dispersant SN5040 accounts for 1 / 3 of the mass of the dispersant The polymer dispersant SN5027 of ammonium polyacrylate accounts for 2 / 3 of the dispersant quality; the rest of the steps are the same as in Example 2.

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Abstract

The invention discloses a method for preparing a titanium dioxide-coated ground calcium carbonate powdered inorganic filler. The method comprises the following steps: 1, gradually adding 100 parts of 1500-mesh calcium carbonate powder to 100 parts of water, adding acetylacetone which is 1% of total mass of calcium carbonate and water, stirring evenly, preferably, adding titanium dioxide to slurry; 2, slowly dropwise adding 17 parts of butyl titanate to a grinder, hydrolyzing to generate titanium dioxide nanoparticles; coating on the surface of ground calcium carbonate particles; preferably slowly dropwise adding a dispersing agent and a surface modifier during the period of grinding, wherein the surface modifier is a water-based titanate coupling agent; the quantity of the surface modifier is 1% of total mass of the calcium carbonate and water; and 3, filtering the titanium dioxide-coated calcium carbonate, drying and crushing, and finishing drying and crushing of the titanium dioxide-coated ground calcium carbonate in a large flash streaming drier once. The method is simple in technological process, and small in environmental pollution, and the quality of the generated titanium dioxide-coated ground calcium carbonate product is ensured.

Description

technical field [0001] The invention relates to a preparation method of an inorganic filler, that is, a preparation method of a titanium dioxide-coated ground calcium carbonate powdery inorganic filler. Background technique [0002] Heavy calcium carbonate, referred to as heavy calcium, is ground from natural carbonate minerals such as calcite, marble, and limestone. It is a commonly used powdered inorganic filler, widely used in coatings, rubber, plastics, paper and other industries. It has the advantages of high chemical purity, good thermal stability, low oil absorption and low refractive index. However, heavy calcium carbonate has poor acid resistance, and its whiteness is not as good as that of titanium dioxide. Therefore, it cannot be widely used as a white filler in plastic steel, coatings and other fields. If you disperse heavy calcium carbonate into a paint with a pH value that is too low, the calcium carbonate will dissolve and the paint itself will easily foam....

Claims

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Application Information

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IPC IPC(8): C09C1/02C09C3/06C09C3/10
Inventor 李刚杨雷周俊蒋冬华
Owner HUNAN LEIXIN NEW MATERIAL TECH
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