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Preparation method of titanium dioxide for PVC (polyvinyl chloride) hard materials

A hard material, titanium dioxide technology, applied in chemical instruments and methods, titanium dioxide, fibrous fillers, etc., can solve the problems of poor light stabilization effect, reduced mechanical strength and service life of products, poor dispersibility, etc., to improve mechanical strength. and service life, improve thermal stability and hiding power, improve the effect of color stability

Inactive Publication Date: 2017-08-04
ANHUI JXTB GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In general PVC products, usually according to the fineness, whiteness, decolorization power, TiO2 added titanium dioxide 2 Technical indicators such as content, hiding power, and dispersibility are often used to evaluate the quality of titanium dioxide. TiO 2 Titanium dioxide with low content (insufficient shielding effect) and poor dispersibility (affecting the surface brightness of the product) has generally poor thermal stability, weather resistance, and light stability in the later stage
If this kind of inferior titanium dioxide is used, the product will show a gradual change in color (first yellow, then red, and finally brown) under the irradiation of ultraviolet rays from the sun, which will cause molecular chain scission in the molecular structure of PVC, which is often called light. Degradation, which greatly reduces the mechanical strength and service life of the product

Method used

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  • Preparation method of titanium dioxide for PVC (polyvinyl chloride) hard materials
  • Preparation method of titanium dioxide for PVC (polyvinyl chloride) hard materials

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preparation example Construction

[0021] The invention provides a method for preparing titanium dioxide used for PVC hard materials, comprising the following steps:

[0022] (1) Put a sodium hydroxide solution with a mass concentration of 48% into an alkali-dissolving tank and heat it to 80°C to 95°C; add metatitanic acid with a concentration of 280g / L to 320g / L into the metatitanic acid metering tank, Heat to 70°C-75°C, then add liquid caustic soda and metatitanic acid into the alkali-dissolving tank at the same time, and age for a period of time after the reaction is complete;

[0023] (2) The aged solution in step (1) is filtered and washed by plate and frame, and the washed solid slurry is put into a peptization tank to prepare crystal seeds;

[0024] (3) Add hydrochloric acid to the peptization tank to adjust the pH value to below 3.1, then heat to 50°C to 80°C, and adjust the pH value to below 3.1 again; then fine-tune the pH value with hydrochloric acid, heat to boiling, and make salt for pretreatment ...

Embodiment 1

[0030] Carry out the titanium dioxide preparation that is used for PVC hard material according to following process, concrete technical scheme is as follows:

[0031] (1) Add 1L18.5mol / L sodium hydroxide into the alkali dissolution tank and heat to 90°C; add 1.5L305g / L (calculated as titanium dioxide) metatitanic acid into the metatitanic acid metering tank and heat to 70°C, Then add liquid caustic soda and metatitanic acid into the alkali dissolution tank at the same time, and age for a period of time after the reaction is complete;

[0032] (2) The solution aged in step (1) is filtered and washed by plate and frame, and then the washed solid slurry is put into a peptization tank to prepare seed crystals;

[0033] (3) Add hydrochloric acid to the peptization tank to adjust the pH value to below 3.1, then heat to 60° C., and adjust the pH value to below 3.1 again; then add 750 ml of hydrochloric acid and heat to boiling to prepare a pre-treatment solution for salt treatment; ...

Embodiment 2

[0039] Carry out the titanium dioxide preparation that is used for PVC hard material according to following process, concrete technical scheme is as follows:

[0040] (1) Add 1L of 18.5mol / L sodium hydroxide into the alkali dissolution tank and heat to 90°C; add 1.5L of 308g / L (calculated as titanium dioxide) metatitanic acid into the metatitanic acid metering tank and heat to 70°C, Then add liquid caustic soda and metatitanic acid into the alkali dissolution tank at the same time, and age for a period of time after the reaction is complete;

[0041] (2) The solution aged in step (1) is filtered and washed by plate and frame, and then the washed solid slurry is put into a peptization tank to prepare seed crystals;

[0042] (3) Add hydrochloric acid to the peptization tank to adjust the pH value to below 3.1, then heat to 58° C., and adjust the pH value to below 3.1 again; then add 768 ml of hydrochloric acid and heat to boiling to make a pre-treatment solution for salt treatment...

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Abstract

The invention belongs to the technical field of titanium dioxide production and relates to a preparation method of titanium dioxide for PVC (polyvinyl chloride) hard materials. The preparation method includes crystal form stabilizer introduction and titanium dioxide aftertreatment. By introduction of crystal form stabilizer in calcination of titanium dioxide, thermal stability and covering power of titanium dioxide are improved, and thermal resistance and color stability of PVC products under high-temperature conditions can be improved remarkably. By a compact phosphorus, silicon and aluminum composite coating technique applied to rutile titanium dioxide, weather resistance, acid resistance and dispersity of titanium dioxide are enhanced, and mechanical strength of the PVC products is improved.

Description

technical field [0001] The invention relates to a preparation method of titanium dioxide used for PVC hard materials, and belongs to the technical field of titanium dioxide production. Background technique [0002] The main component of titanium dioxide is titanium dioxide (TiO 2 ) white pigment is a polycrystalline compound whose particles are arranged regularly and have a lattice structure. Titanium dioxide is widely used in various structural surface coatings, paper coatings and fillers, plastics and elastomers, and other uses include ceramics, glass, catalysts, coated fabrics, printing inks, roofing granules and fluxes. In plastic products, titanium dioxide is often used as a light stabilizer in the formulation of PVC products to play a shielding role. [0003] In general PVC products, usually according to the fineness, whiteness, decolorization power, TiO2 added titanium dioxide 2 Technical indicators such as content, hiding power, and dispersibility are often used t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/06C09C3/12C01G23/08C08K9/10C08K9/06C08K3/22C08L27/06
CPCC09C1/3661C01G23/08C08K3/22C08K9/06C08K9/10C08K2003/2241C08L2201/08C09C1/3684C09C3/006C09C3/063C09C3/12C08L27/06
Inventor 张本发张俢臻马征程
Owner ANHUI JXTB GRP