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Preparation method and application of organic modified silica sol

An organic modifier and silica sol technology, which is applied in the treatment of dyed organosilicon compounds, chemical instruments and methods, dyed low-molecular-weight organic compounds, etc. The appearance of the sol is clear and transparent, the film-forming property is not affected, and the effect of good physical and mechanical properties

Active Publication Date: 2016-05-04
HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that silica sol is sensitive to the complex external environment and prone to flocculation and gel, the present invention provides a method for preparing organically modified silica sol. The obtained silica sol has a high grafting rate and good storage stability. Applied to water-based paint

Method used

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  • Preparation method and application of organic modified silica sol
  • Preparation method and application of organic modified silica sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1). Preparation of organic modifier

[0029] First raise the temperature of 20 parts by weight of isopropanol to 80°C, and then dropwise add 20 parts by weight of γ-(methacryloyloxy)propyltrimethoxysilane, 10 parts by weight of polyethylene glycol methyl 1 / 3 of the weight of the mixed solution composed of acrylate, 20 parts by weight of styrene, 0.5 parts by weight of AIBN, and 0.5 parts by weight of dodecyl mercaptan, add the remaining mixed solution dropwise after 30 minutes, and keep the temperature after the dropwise addition After 3 hours, the temperature was lowered, filtered, and the solvent was removed under reduced pressure to obtain the silica sol organic modifier 1.

[0030] 2).Modification of silica sol

[0031] Get 50 parts by weight of acidic silica sol (average particle diameter 20nm, solid content is 30%), add the catalyst formic acid of 1 part by weight, and the ethanol of 50 parts by weight, then add dropwise the organic modifier 1 of 20 parts by weig...

Embodiment 2

[0033] 1). Preparation of organic modifier

[0034] First raise the temperature of 30 parts by weight of isopropanol to 60°C, and then dropwise add 30 parts by weight of γ-(methacryloyloxy)propyl triethoxysilane, 10 parts by weight of polyethylene glycol 1 / 3 of the weight of the mixed solution composed of methacrylate, 0.3 parts by weight of AIBN, and 2.5 parts by weight of dodecanethiol, and then add the remaining mixed solution dropwise after 15 minutes, keep the temperature for 8 hours after the dropwise addition, and finally cool down , filtered, and the solvent was removed under reduced pressure to obtain silica sol organic modifier 2.

[0035] 2).Modification of silica sol

[0036] Get 30 parts by weight of alkaline silica sol (average particle diameter 20nm, solid content is 30%), add 0.5 parts by weight of catalyst acetic acid, and 30 parts by weight of isopropanol, then dropwise add 100 parts by weight of organic modifier 2. After modification at 30° C. for 5 hours,...

Embodiment 3

[0038] 1). Preparation of organic modifier

[0039] First raise the temperature of 40 parts by weight of isopropanol to 70°C, and then add 40 parts by weight of γ-(methacryloyloxy)propyltrimethoxysilane and 50 parts by weight of N-vinylpyrrolidone dropwise at this temperature. , 1 / 3 of the mixed solution weight that the AIBN of 0.1 weight part, the dodecyl mercaptan of 2 weight parts form, then add dropwise remaining mixed solution after 45min, after dropping, keep warm for 7h again, finally through cooling, filter, and The solvent was removed under reduced pressure to obtain silica sol organic modifier 3.

[0040] 2).Modification of silica sol

[0041] Get 20 parts by weight of neutral silica sol (average particle diameter 20nm, solid content is 30%), add 1.5 parts by weight of catalyst industrial hydrochloric acid, and 20 parts by weight of n-butanol, then dropwise add 10 parts by weight of organic modified Agent 3 was modified at 40° C. for 4 hours, and filtered to obtain...

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Abstract

The invention belongs to the field of organic-inorganic composite materials. In order to solve the problem that silica sol is sensitive to the external complex environment so as to be easy to cause the phenomena such as flocculation and solidification, the invention provides a preparation method of an organic modified silica sol. The method comprises the following steps of preparing an organic modifier first, and then modifying the silica sol, so that the obtained silica sol is higher in grafting yield, good in storage stability and applied to water-based paint.

Description

technical field [0001] The invention belongs to the field of organic-inorganic composite materials, and in particular relates to an organically modified silica sol and an application thereof. Background technique [0002] Silica sol is nanoscale amorphous SiO 2 Particles, which are dispersed in water and stabilized in colloidal solutions in water through charges or other auxiliary forms, are environmentally friendly and inexpensive inorganic nanomaterials, and have been widely used in coatings, ceramics, adhesives, fabrics and other fields. [0003] Due to its low VOC emission and low impact on the environment, water-based coatings are gradually replacing ordinary oil-based coatings. However, due to the problems of the resin itself, water-based coatings have low hardness and poor water resistance after film formation, so they need to be improved. sex. with SiO 2 The particles can be used to blend and modify the water-based resin in the water-based paint, which can be used...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/28C09C3/08C09C3/10C09C3/12C08F230/08C08F212/08C08F220/28C08F226/10C08F220/14C08F220/18C09D7/12
CPCC09D7/62C08F212/08C08F226/10C08F230/08C09C1/28C09C3/006C09C3/08C09C3/10C09C3/12C08F220/286C08F220/14C08F220/1804
Inventor 钱涛徐凯刘海龙刘海兵
Owner HANGZHOU JIHUA POLYMER MATERIAL CO LTD
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