Titanium dioxide special for plastic-steel profiles and preparation method thereof

A special type of titanium dioxide technology, applied in chemical instruments and methods, fibrous fillers, dyeing physical treatment, etc., can solve problems such as strong surface polarity, damage to product continuity, and reduced weather resistance, and achieve lubricity and flow Good performance, excellent fluidity of dry powder, and the effect of avoiding direct contact

Active Publication Date: 2019-01-25
CHONGQING TITANIUM IND OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photochemical activity of titanium dioxide pigment is the main factor affecting the weather resistance. Because titanium dioxide itself has some lattice defects, there are many photoactivation points on its surface, which have a slight absorption of visible light and ultraviolet spectrum. Under the long-term irradiation of ultraviolet light, if With the action of catalysts such as water, titanium dioxide can undergo continuous oxidation-reduction reactions to generate hydroxyl and peroxyl radicals. They are highly active and can oxidize organic polymers in products, resulting in polymer chain scission and degradation. , destroy the continuity of the product and reduce the weather resistance of the product
In order to achieve clean and environmentally friendly production, improve production automation and output, solve the problem of feeding and conveying dust, and reduce the labor intensity of workers, the current transportation method of titanium dioxide in the production of plastic steel profiles is mainly air transportation under airtight conditions, and the particle size of titanium dioxide is small. Large specific surface area, strong surface polarity, easy to agglomerate, poor fluidity of dry powder, in order to improve the fluidity of dry powder of titanium dioxide for plastic steel profiles, it is necessary to carry out special control on its production process and carry out surface treatment
[0006] However, the existing titanium dioxide has poor weather resistance and dry powder fluidity

Method used

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  • Titanium dioxide special for plastic-steel profiles and preparation method thereof

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preparation example Construction

[0030] The preparation method of special type titanium dioxide for plastic steel profile comprises the following steps:

[0031] A. Pretreatment: add dispersant sodium silicate solution into deionized water or distilled water, add rutile titanium dioxide particles, perform beating and dispersion treatment, and obtain titanium dioxide slurry with a slurry concentration of 300-600g / L; The slurry is wet ground, and the ground slurry is classified to obtain a titanium dioxide slurry with a titanium dioxide particle size D50 of 0.25-0.45 μm and D90≤0.8 μm;

[0032] B. Inorganic coating:

[0033] ① Coated silica: Add the classified slurry into the coating equipment with stirring device, start the stirring device, heat and maintain the temperature of the slurry at 70-90°C, add silicate solution to the slurry, the The amount of silicate solution added is SiO 2 Calculated as TiO in the slurry 2 2.0 to 4.0% of the mass, react for 10 to 30 minutes; add acid or alkali solution at a con...

Embodiment 1

[0045] The prepared sodium silicate dispersant was added into the deionized water, and then rutile titanium dioxide particles were added for beating and dispersion treatment to obtain a titanium dioxide slurry with a concentration of 450 g / L. The titanium dioxide slurry was subjected to wet grinding, and the ground slurry was classified to obtain the classified slurry: the particle size D50 of the titanium dioxide particles in the slurry was 0.35 μm, and the D90 was 0.75 μm.

[0046] Put the slurry into the coating equipment with stirring device, start the stirring device, heat and maintain the temperature of the slurry at 85°C, add a sodium silicate solution with a concentration of 200g / L to the slurry, and the addition amount is expressed as SiO 2 Calculated as TiO in the slurry 2 3.5% of the mass, react for 25 minutes; add dilute alkali solution at a constant speed within 100 minutes to adjust the pH value of the slurry to 5.5, and react for 25 minutes;

[0047] Lower the ...

Embodiment 2

[0051] The prepared sodium silicate dispersant was added into the deionized water, and then rutile titanium dioxide particles were added for beating and dispersion treatment to obtain a titanium dioxide slurry with a concentration of 450 g / L. The titanium dioxide slurry was subjected to wet grinding, and the ground slurry was classified to obtain the classified slurry: the particle size D50 of the titanium dioxide particles in the slurry was 0.35 μm, and the D90 was 0.75 μm.

[0052] Put the slurry into the coating equipment with stirring device, start the stirring device, heat and maintain the temperature of the slurry at 65°C; add 100g / L zirconium sulfate solution to the slurry within 100min, and the addition amount is expressed as ZrO 2 Calculated as TiO in the slurry 2 0.5% by mass, react for 40 minutes;

[0053] Heat and maintain the temperature of the slurry at 85°C, add a sodium silicate solution with a concentration of 200g / L to the slurry, and the amount added is exp...

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Abstract

The invention belongs to the field of chemical industry, and particularly relates to titanium dioxide special for plastic-steel profiles and a preparation method thereof. The technical problem to be solved by the invention is how to provide a preparation method for titanium dioxide special for plastic-steel profiles. The preparation method includes the steps of performing pulping, grinding and graded pretreatment on titanium dioxide rutile and then performing silicon oxide and aluminum oxide inorganic coating, and performing sieving and washing to perform organic coating to obtain the product.The titanium dioxide special for plastic-steel profiles prepared by the method has good weather resistance and dry powder flowability, and can well meet the subsequent use.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a titanium dioxide special for plastic steel profiles and a preparation method thereof. Background technique [0002] Titanium dioxide, commonly known as titanium dioxide, is currently the best white pigment in the world. It not only has very stable physical and chemical properties, but also has excellent optical and electrical properties such as high refractive index, best hiding power, best whiteness and brightness, and is widely used. It is called "industrial monosodium glutamate" in the fields of coatings, plastics, papermaking, ink, electronics and so on. [0003] Plastic steel profiles are made of polyvinyl chloride (PVC) resin as the main raw material, plus a certain proportion of stabilizers, colorants, fillers, ultraviolet absorbers, etc., and extruded into profiles. As the best white inorganic pigment, titanium dioxide is used as a colorant in plastic steel profiles. I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/04C09C3/06C09C3/12C08K9/10C08K9/02C08K3/22
CPCC01P2004/51C01P2006/20C08K3/22C08K9/02C08K9/10C08K2003/2241C09C1/3692C09C3/006C09C3/041C09C3/063C09C3/12
Inventor 肖勇丽柯良辉赵北东刘茂涛冯燕罗静刘延豪
Owner CHONGQING TITANIUM IND OF PANGANG GROUP
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