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Method for preparing special titanium dioxide pigment for plastic sectional materials by chlorination method

A technology of titanium dioxide and plastic profiles, which is applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve the problems that the weather resistance can not be truly satisfied, and the covering power of dense silicon is not effectively improved, so as to improve the opacity, improve the Compatibility and the effect of improving optical properties

Active Publication Date: 2011-05-25
中信钛业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

According to the technology introduced in US3437502, porous aluminum is used to cover the outer layer of dense silicon, although the dispersion is improved without sacrificing the weather resistance of the pigment, but the hiding power of dense silicon is not effectively improved; while CN97190344. This form of aluminum film can effectively improve the opacity and hiding power of the product, but the weather resistance of this type of product cannot really meet the needs of its use in the field of high-grade plastic profiles

Method used

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  • Method for preparing special titanium dioxide pigment for plastic sectional materials by chlorination method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Weigh 500g of the primary product powder of titanium dioxide by chlorination method, wherein alumina accounts for 0.6% of the weight of the primary product of titanium dioxide, add deionized water to prepare a 500g / l slurry, and use a concentration of 20% sodium hydroxide solution to adjust the pH of the slurry value to 4.5; add sodium hexametaphosphate solution, phosphorus pentoxide in the phosphate dispersant accounts for 0.3% of the weight of the initial titanium dioxide product, and disperse for 30 minutes. Sand was added into a sand mill, and the above-mentioned slurry was sand-milled to obtain a slurry with an average particle size of 318nm, and the particle size distribution was calculated by quantity, and the proportion exceeding 800nm ​​was 0.5%. Remove the grinding medium from the water slurry, raise the temperature of the sand-milled slurry to 80°C, and maintain this temperature throughout the silicon coating process, add 3.0% sodium silicate solution in 2 hou...

Embodiment 2

[0023] Weigh 400g of the primary product powder of titanium dioxide obtained by the chlorination method, wherein alumina accounts for 1.5% of the weight of the primary product of titanium dioxide, add deionized water to prepare a 400g / l slurry, and use a concentration of 20% sodium hydroxide solution to adjust the pH of the slurry value to 4.0, add sodium hexametaphosphate solution, phosphorus pentoxide in the phosphate dispersant accounts for 0.1% of the weight of the initial titanium dioxide product, and disperse for 20 minutes. The average particle diameter of the obtained slurry is 400nm, and the particle size distribution is calculated by number, and the proportion exceeding 800nm ​​is 1.0%. Remove the grinding medium from the water slurry, raise the temperature of the sand-milled slurry to 60°C, and maintain this temperature throughout the silicon coating process, add 2.0% sodium silicate solution within 1 hour, and use 10% hydrochloric acid at the same time The solution...

Embodiment 3

[0025] Weigh 600g of the primary product powder of titanium dioxide obtained by the chlorination process, wherein alumina accounts for 1.0% of the weight of the primary product of titanium dioxide, add deionized water to prepare a 600g / l slurry, and use a concentration of 20% sodium hydroxide solution to adjust the pH of the slurry value to 5.0, add sodium hexametaphosphate solution, phosphorus pentoxide in the phosphate dispersant accounts for 1.0% of the weight of the initial titanium dioxide product, and disperse for 30 minutes. Sand was added into a sand mill, and the above-mentioned slurry was sand-milled to obtain a slurry with an average particle size of 327nm, and the particle size distribution was calculated by number, and the proportion exceeding 800nm ​​was 0.5%.

[0026]Remove the grinding medium from the water slurry; raise the temperature of the sand-milled slurry to 90°C, and maintain this temperature throughout the silicon coating process, add 4.0% sodium silica...

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Abstract

The invention provides a method for preparing special titanium dioxide pigment for plastic sectional materials by a chlorination method, which comprises the following steps that: the chlorination method is adopted for preparing titanium dioxide primary products into slurry, and the pH value of the slurry is regulated to 4.0 to 5.0; phosphate dispersing agents are added; grinding treatment is carried out, then, grinding media is removed, and the temperature is raised; water-soluble silicate solution is added, the pH value of the slurry is maintained between 3.5 and 4.5, amorphous silicon oxide is formed, curing is carried out, and a first covering layer is formed; the pH value of the slurry is regulated to 6.0 to 7.0, curing is carried out, and a second covering layer is formed; aluminum salt solution is added, the pH value is controlled between 7.0 and 9.0, curing is carried out, a third covering layer is formed, the pH value of the slurry is regulated to 6.0 to 7.0, and curing is carried out; the slurry is washed by de-ionized water until the conductivity of filter cake is higher than 15000 ohm*cm, and then, drying and air powder treatment are carried out; modified polysiloxane is added in the air powder process, and a fourth organic covering layer is formed; and materials are recovered through a bag filter. The titanium dioxide pigment prepared by the method provided by the invention has the advantages of high weatherability, high shielding capability, high non-transparency and excellent processing performance in the field of plastic sectional materials.

Description

technical field [0001] The invention relates to a preparation method of a special-purpose titanium dioxide pigment for chlorinated plastic profiles in the field of chemical industry. Background technique [0002] The surface treatment of primary titanium dioxide products is mainly based on silicon and aluminum oxides. The pigments produced by this coating process are used in coatings and plastic profiles to prevent chalking and loss of gloss, and are used in paper. Has good opacity and good hiding power in flat latex paints. Silica hydrate is used to coat the surface of titanium dioxide. Although the weather resistance of this pigment is improved, the gloss and opacity are not as good as other coated products. According to the technology introduced in US3437502, porous aluminum is used to cover the outer layer of dense silicon, although the dispersion is improved without sacrificing the weather resistance of the pigment, but the hiding power of dense silicon is not effectiv...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/12C09C3/06C09C3/04
Inventor 于学成姜志刚王建伟马英华马玉杰杜枫徐兴龙张炳
Owner 中信钛业股份有限公司
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