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Calcium-based titanium dioxide pigment and preparation method thereof

A technology of titanium dioxide and silicon dioxide, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems of insufficient combination of calcium carbonate and titanium dioxide, low weather resistance, and insufficient hiding power, etc., to achieve Low oil absorption value, low cost, good decolorization performance

Inactive Publication Date: 2017-04-26
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the composite titanium dioxide prepared by this method, the combination of calcium carbonate and titanium dioxide is not strong enough, the hiding power is not strong enough, and the weather resistance is not high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 50g of 1250 mesh calcium carbonate and add it to 100mL of water, stir evenly, add 15mL of ethyl orthosilicate and 25mL of ethanol to prepare a silica-coated calcium carbonate slurry.

[0024] Adjust the pH value of the silica-coated calcium carbonate slurry to 10 with ammonia water, stir at 50°C for 2 hours, filter and wash to obtain a filter cake, calcinate the obtained filter cake at 500°C for 4 hours, and then pulverize it to obtain Silica coated calcium carbonate powder.

[0025] Add the above silica-coated calcium carbonate powder into 150mL of water, stir evenly, add 50mL of titanyl sulfate solution with a concentration of 200g / L, and stir at 90°C for 3h to prepare a titanium dioxide-coated pigment slurry.

[0026] washing the coated pigment slurry, and filtering to obtain a filter cake;

[0027] The filter cake obtained by washing and filtering was calcined at 700° C. for 4 hours, and then pulverized after calcining to obtain calcium-based titanium dioxide...

Embodiment 2

[0029] Weigh 50g of 1250mesh calcium carbonate and add it to 120mL of water, stir evenly, add 12mL of ethyl orthosilicate and 25mL of ethanol to prepare a silica-coated calcium carbonate slurry.

[0030] Adjust the pH value of the silica-coated calcium carbonate slurry to 12 with ammonia water, stir at 30°C for 4 hours, filter and wash to obtain a filter cake, calcinate the obtained filter cake at 500°C for 5 hours, and then pulverize it to obtain Silica coated calcium carbonate powder.

[0031] Add the above silicon dioxide-coated calcium carbonate powder into 120mL of water, stir evenly, add 50mL of titanium sulfate solution with a concentration of 250g / L, and stir at 105°C for 1 hour to prepare a titanium dioxide-coated pigment slurry.

[0032] washing the coated pigment slurry, and filtering to obtain a filter cake;

[0033] The filter cake obtained by washing and filtering was calcined at 800° C. for 3 hours, and then pulverized after calcining to obtain calcium-based ti...

Embodiment 3

[0035] Weigh 50g of calcium carbonate of 1250 mesh and add it into 150mL of water, stir evenly, add 50ml of 400g / L sodium silicate solution to prepare a silica-coated calcium carbonate slurry, and the pH value of the solution is 13.

[0036] Stir the silica-coated calcium carbonate slurry at 30°C for 2 hours, filter and wash to obtain a filter cake, calcinate the obtained filter cake at 550°C for 3 hours, and pulverize it after calcining to obtain silica-coated calcium carbonate powder .

[0037] Add the above silicon dioxide-coated calcium carbonate powder into 100 mL of water, stir evenly, add 50 mL of titanyl sulfate solution with a concentration of 200 g / L, and stir at 120° C. for 1 h. Prepare a pigment slurry coated with titanium dioxide on the surface.

[0038] washing the coated pigment slurry, and filtering to obtain a filter cake;

[0039] The filter cake obtained by washing and filtering is calcined at 900° C. for 2 hours, and then pulverized after calcining to obt...

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PUM

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Abstract

The invention provides a calcium-based titanium dioxide pigment and a preparation method thereof. The calcium-based titanium dioxide pigment is prepared through the following two steps: coating the surface of calcium carbonate with a silicon dioxide film, and coating the silicon dioxide film with a titanium dioxide film, wherein the pigment is prepared from, in parts by weight, 60 to 85 parts of calcium carbonate, 2 to 5 parts of silicon dioxide and 10 to 35 parts of titanium dioxide. The preparation method comprises steps like coating-condensation, washing, filtering and calcining; and the pigment prepared by the preparation method has the characteristics of low cost, high whiteness, good tint-reducing power, low oil absorption value, etc.

Description

technical field [0001] The invention relates to a preparation method of calcium-based titanium dioxide pigment. Background technique [0002] The scientific name of titanium dioxide is titanium dioxide, which is an important white pigment. Compared with traditional white pigments such as lead white, zinc white, and lithopone, titanium dioxide has high refractive index, strong decolorization power, large hiding power, and good whiteness. , non-toxic and other excellent properties, known as the king of white pigments. Titanium dioxide occupies an important position in the national economy, and its consumption growth rate in all aspects is directly proportional to the total output value of the national economy. Therefore, the consumption of titanium dioxide can be used as an important indicator to measure a country's economic development level and people's living standards. sign. With the development of titanium dioxide application technology, the application field of titaniu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06
CPCC09C1/3653C01P2006/19C01P2006/90C09C3/06
Inventor 赵伟刘悦陈彦如齐涛曹磊
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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