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Preparation method of core-shell type titanium dioxide coated silica

A technology of silicon dioxide and titanium dioxide, which is applied in chemical instruments and methods, dyeing low-molecular-weight organic compounds, fibrous fillers, etc., to achieve good application prospects and the effect of improving hiding power

Active Publication Date: 2018-09-25
HENAN JUNHUA DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used modifiers mainly include chlorosilanes, alcohols, silane coupling agents, and siloxane-based organosilicon compounds, but the research on coating a layer of titanium dioxide film on the surface of silica matrix particles by hydrolysis precipitation has not been reported yet.

Method used

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  • Preparation method of core-shell type titanium dioxide coated silica

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] It is 15% ammonium chloride solution 333Kg to add mass concentration in reactor earlier, and 1000Kg mass concentration is the water glass solution of 10%, add the ammoniacal liquor-ammonium chloride damping fluid 2Kg that pH value is 7.5 simultaneously, temperature is raised to React at 80°C for 3 hours under the condition of strong mechanical stirring to obtain 76Kg of silicon dioxide. Then add 12.5Kg titanyl sulfate and 6.7Kg sodium acetate, and add 0.37Kg sodium dodecylbenzenesulfonate at the same time, adjust the reaction temperature to 70°C, and after 2 hours of reaction, wash, filter, dry, calcinate, pulverize and other processes, Finally, a core-shell titanium dioxide-coated silica product is obtained.

[0028] The test results of the obtained product performance and application performance are shown in Table 1.

Embodiment 2

[0030] It is 10% ammonium chloride solution 700Kg that adding mass concentration is 10% in reactor earlier, and 1300Kg mass concentration is the water glass solution of 12%, adds the ammoniacal liquor-ammonium chloride buffer solution 3Kg that pH value is 8.5 simultaneously, temperature is raised to React at 70°C for 4 hours under the condition of strong mechanical stirring to obtain 118Kg of silicon dioxide. Then add 47.2Kg titanyl sulfate and 28.8Kg sodium acetate, add fatty alcohol polyoxyethylene ether 1.88Kg at the same time, adjust the reaction temperature to 75°C, react for 3 hours and go through washing, filtering, drying, calcining, crushing and other processes to finally get Core-shell titanium dioxide coated silica products.

[0031] The test results of the obtained product performance and application performance are shown in Table 1.

Embodiment 3

[0033] It is 333Kg of ammonium chloride solution 333Kg that mass concentration is 12% in reactor earlier, and 900Kg mass concentration is 15% water glass solution, adds the ammoniacal liquor-ammonium chloride damping fluid 1.5Kg that pH value is 9.0 simultaneously, raises temperature To 90°C, react for 2h under the condition of strong mechanical stirring to obtain 103Kg of silicon dioxide. Then add 30.2Kg titanyl sulfate and 16.1Kg sodium acetate, and add 1.51Kg fatty acid glyceride at the same time, adjust the reaction temperature to 85°C, after 4 hours of reaction, wash, filter, dry, calcinate, crush and other processes, and finally get the core-shell type Titanium dioxide coated silica products.

[0034] The test results of the obtained product performance and application performance are shown in Table 1.

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Abstract

The invention provides a preparation method of core-shell type titanium dioxide coated silica. The method includes following steps in order: firstly adding an ammonium chloride solution and a water glass solution to the reaction kettle, and adding a certain amount of an aqueous ammonia-ammonium chloride buffer solution at the same time; reacting at 55-95 DEG C for a certain period of time to obtain silica sol; then adding titanyl sulfate and sodium acetate to the silica sol and adding an appropriate amount of a surfactant at the same time; stirring and mixing the mixture with an emulsifier; and after a period of time of reaction at 60-90 DEG C, performing washing, filtration, drying, calcining, crushing, and the like to obtain a core-shell type titanium dioxide coated silica product. According to the product, silica is coated with a titanium dioxide film, thus increasing the covering power of the silica. The core-shell type titanium dioxide coated silica can improve product thixotropicproperties in coating and ink application, can replace a part of expensive titanium dioxide, and is of great significance for broadening the application range of silica. The method is simple to operate and prone to industrial production.

Description

technical field [0001] The invention relates to a method for preparing silicon dioxide, in particular to a method for preparing core-shell type titanium dioxide-coated silicon dioxide. Background technique [0002] Silica, commonly known as white carbon black, is a white, non-toxic, amorphous fine powder with porosity, high dispersibility, light weight, good chemical stability, high temperature resistance, non-combustibility, and good electrical insulation Important inorganic silicon compounds with excellent properties. [0003] Silica is an excellent rubber reinforcing agent in the rubber industry, which can improve bonding and tear resistance. In the paper industry, silica can improve the whiteness, strength and opacity of paper. Silica can be used as anti-caking agent and dispersant in pesticide industry. [0004] The surface of silica contains a large number of silicon hydroxyl groups. Using certain chemical substances to react with the hydroxyl groups on the surface ...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/06C09C3/08C09C3/04C09D7/62C09D11/03
CPCC09C1/28C09C3/006C09C3/04C09C3/06C09C3/063C09C3/08C09D11/03C09D7/62
Inventor 王恩伟郑强李冬孙浩杰潘幸辉刘源穗贤杰李森冯炳勋
Owner HENAN JUNHUA DEV
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