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Prepn process of polymer coated silica composite particle

A silica and polymer technology, applied in the treatment of dyed polymer organic compounds, fibrous fillers, etc., can solve the problem that the degree of hydrophobicity cannot meet the needs of practical use.

Inactive Publication Date: 2007-12-19
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the degree of hydrophobization of the polymer-coated silica obtained by the above method still cannot meet the needs of actual use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0073] Preparation of carboxyl-containing copolymers:

[0074] (Take C-4 as an example)

[0075] Add water 500mL and anionic surfactant (sodium dialkyl succinate sulfonate) 1.8g, methacrylic acid 25.8g, methyl methacrylate After 70.0 g, it was emulsified and dispersed while stirring from room temperature to 70°C. Then dissolve 0.05g of benzoyl peroxide in 100mL of toluene and drop it into the reaction vessel within 2 hours for emulsion polymerization. After the addition of the catalyst, continue the reaction at 70°C for 3 hours and cool to room temperature to obtain methacrylic acid-methyl Methyl acrylate copolymer (C-4:molar ratio=30:70) O / W type emulsion.

[0076] The following carboxyl group-containing copolymers (C-1 to C-13) can be obtained by the above method.

[0077] C-1: methacrylic acid-methyl methacrylate (molar ratio is 3:97) copolymer;

[0078] C-2: methacrylic acid-methyl methacrylate (molar ratio is 7:93) copolymer;

[0079] C-3: methacrylic acid-methyl met...

Embodiment 1

[0093] Example 1 (polymer-coated silica composite microparticles 1):

[0094] After adding 100mL of deionized water and 1g of amino silane coupling agent (A-1) into a 1000mL metal reaction vessel with a stirrer, thermometer and condenser tube, slowly add wet-process hydrophilic Silicon (B-1) 20g, reacted at room temperature for 30 minutes, filtered (or centrifuged) to obtain silicon dioxide containing amino groups on the surface, and then added to the metal reaction container. In addition, 1.8 g of methacrylic acid-methyl methacrylate copolymer (C-1) was added to a 300 mL beaker, 150 mL of toluene was stirred and dissolved at 70°C, and then added to the above-mentioned metal reaction vessel heated to 70°C and stirred for 2 Hour. Finally, water and toluene were removed at 90-110°C, and the product was then vacuum-dried at 120°C for 4 hours to obtain the polymer-coated silica composite fine particles 1 of the present invention.

Embodiment 2～10

[0095] Examples 2-10 (polymer-coated silica composite microparticles 2-10):

[0096] Using the same method as in Example 1, replace methacrylic acid-methyl methacrylate copolymer (C-1) in Example 1 with carboxyl-containing copolymers (C-2) to (C-10) to obtain the present invention Polymer-coated silica composite microparticles 2-10.

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PUM

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Abstract

The preparation process of polymer coated silica composite particle includes the following steps: 1. preparing hydrophilic silica, amino silane coupler in the amount of 2-20 wt% hydrophilic silica, and carboxyl group containing copolymer in such amount as the molar ratio between the carboxyl groups in the copolymer and the amino groups in the amino silane coupler of 1-2 to 1; 2. compounding the amino silane coupler into water solution or organic solution, and compounding the carboxyl group containing copolymer into solution or emulsion; and 3. mixing the water solution or organic solution of amino silane coupler with silica through spraying or soaking, mixing the solution or emulsion of carboxyl group containing copolymer with the amino silane coupler treated silica, and drying to obtain polymer coated silica composite particle possessing excellent hydrophobic performance.

Description

technical field [0001] The invention relates to a preparation method of polymer-coated silicon dioxide composite microparticles, which can be used as fillers for coatings, resins, rubbers and dental materials. Background technique [0002] Polymer-coated silica composite microparticles can be used as functional fillers to improve mechanical and physical properties such as strength, toughness, impact resistance, and thermal stability of polymer materials such as coatings, resins, rubber, and dental materials. At the same time, the surface properties of the molding material added with the composite microparticles, such as light aging resistance, water resistance, oil resistance, chemical resistance, pollution resistance, anti-adhesion and wear resistance, and other surface physical and chemical properties are also greatly improved. . [0003] When using commercially available polysiloxane-coated hydrophobic silica mixed with resin, rubber, etc. to prepare composite molding ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/10C09C1/28
Inventor 王重辉许婷杨小军
Owner WUHAN UNIV OF TECH
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