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Modified silicasol and application thereof in preparing water paint

A technology of water-based paint and silica sol, applied in the direction of coating, latex paint, etc., can solve the problems of poor leveling, fast drying, strong rigidity, etc., and achieve the effect of high decoration, simple manufacturing method, and high hardness

Inactive Publication Date: 2008-08-13
DALIAN JIAOTONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic water-based base materials are mainly four types of silicate, phosphate, silica sol, and cement. Such coating films have defects such as strong rigidity, poor gloss, fast drying, easy cracking, and poor leveling, and their applications are limited. , especially in the application of preparing ultra-thin coatings or protective coatings on metal surfaces, mostly organic solvent-based

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: the preparation of modified silica sol

[0027] The modified silica sol described in the present invention is obtained by modifying a commercially available silica sol product through organosilane. The silica sol product used in this example is produced by Zhejiang Yuda Chemical Co., Ltd., with a particle size of 10-20 nm. Content 30%, pH9~10.

[0028] The modified silica sol is specifically prepared by the following method: adjust the pH value of the silica sol to between 3 and 6 with acid, then put it in a water bath at 50°C to 80°C, stir slowly, and add organosilane while stirring, The amount of organosilane added and SiO in silica sol 2 The mass ratio is between 1: 1 and 5: 1; stirring in the open, or reflux stirring, keeping for 0.5 to 5 hours, evaporating off the by-products generated by hydrolysis, thus obtaining a transparent sol, which is described in the present invention organosilane-modified silica sol. See Table 1 for specific examples.

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Embodiment 2

[0033] Embodiment 2: the application of modified silica sol in the preparation of water-based paint

[0034] The specific method of applying the modified silica sol of the present invention to prepare the water-based paint is as follows: adopt the SDF-400 type disperser with a blade diameter of 60 mm. First, add the dispersing aid, half of the defoamer and water into the barrel of the dispersing machine, and disperse at a low speed for 3 to 5 minutes to make the additives uniformly disperse in the water; then add nano-scale metal oxides, disperse at a high speed for 5 to 10 minutes, and then Add the rest of the pigments and fillers and disperse at high speed for 30-40 minutes. After the pigments and fillers are dispersed, grind at 800-1000rpm for 40-60 minutes to reach the specified fineness. Finally, the modified silica sol of the present invention and the remaining additives are added and dispersed at a low speed for 20 to 30 minutes to obtain a coating with good dispersion...

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Abstract

The invention discloses a modified silica sol and application thereof in preparation of aqueous painting. The inventive modified silica sol is prepared from aqueous silica sol by regulate pH value of raw material to 3-6; charging organosilane with a mass ratio with SiO2 in silica sol of 1:1 - 5:1, water bathing at temperature of 50-80 DEG C., waiting for 0.5-5 hours, vaporizing by-products generated in hydrolysis to obtain transparent sol, which is final product. The modified silica sol has cheap raw material, simple preparation. When used as matrix in preparation of paint, the sol uses only water as solvent, without need of adding any organism such as alcohol. The preparation is simple, economic, environmental protecting. The prepared aqueous paint not only has high decorative, great adhesion and toughness of organic paint, but also has high rigidity, chemical resistance of inorganic paint, which can be used on surface of substrates of metal, glass, wood, plastic and in construction industry.

Description

technical field [0001] The invention relates to a modified silica sol and its application in the preparation of water-based paint, which belongs to the field of paint industry. Background technique [0002] The first thing to be solved in the preparation of water-based paints is the preparation of water-based base materials, that is, water-based emulsions. Inorganic water-based base materials are mainly four types of silicate, phosphate, silica sol, and cement. Such coating films have defects such as strong rigidity, poor gloss, fast drying, easy cracking, and poor leveling, and their applications are limited. , especially in the application of preparing ultra-thin coatings or protective coatings on metal surfaces, mostly organic solvent-based. [0003] The research on silica sol-organosilicon composites has a long history. The coatings based on silica sol-organosilicon composites have the dual advantages of organic coatings and inorganic coatings, and have high application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/06C09D183/04C09D5/02
Inventor 李国军崔学军任瑞铭董洪亮
Owner DALIAN JIAOTONG UNIVERSITY
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