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Silica collosol binder and its manufacturing method

A manufacturing method and technology of silica sol, applied in the direction of adhesives, monocarboxylic acid ester copolymer adhesives, adhesive types, etc., can solve the problems of rising cost, increasing selling price, discomfort, etc.

Inactive Publication Date: 2003-04-30
章浩龙
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in practical application, the following problems will appear: the acidic region can maintain the stable existence of silica sol and high polymer, but it brings many discomforts in application
More importantly, the high-demand acidification, deionization, and metal ion surface modification of silica sol mentioned in the patent will not only bring cumbersome processes, but also increase costs and lower sales prices. Improve, limit its promotion and application
[0005] Of course, the modified silica sol binder can also be used in some fields other than investment casting, while the acidic silica sol will limit the application in some fields

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A silica sol binder, the composition of which contains alkaline silica sol, PVA or modified starch or modified cellulose.

Embodiment 2

[0014] A silica sol binder, which contains alkaline silica sol, PVA or modified starch or modified cellulose, and the pH value of the silica sol binder is 7.5-10.0.

Embodiment 3

[0016] A kind of silica sol binding agent, its composition contains alkaline silica sol, PVA or modified starch or modified cellulose, in described silica sol binding agent, SiO 2 The content is 5-35%, preferably 15-30%.

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PUM

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Abstract

A silicone sol adhesive modified by PVA, modified starch, or modified cellulose is prepared through preparing the aqueous solution of PVA, modified starch, or modified cellulose, preparing the solution of alkaline silicon sol, and mixing. It can be used for investment casting to increase drying speed, wet strength and residual strength with low cost.

Description

technical field [0001] The invention belongs to a binder composite material and a manufacturing method thereof, in particular to a high polymer modified silica sol and a manufacturing method thereof. Background technique [0002] Binder is the main raw material for investment casting, which directly affects the shell and casting quality, production cycle and cost. In 1939, when the investment casting industry was produced, alcohol-based ethyl silicate hydrolyzed solution was used as binder, and in 1960, water-based silica sol binder was introduced. For a long time, silica sol binders have been continuously improved and developed, initially using Na + As a stabilizer, the diameter of colloidal particles is 12-15nm, SiO 2 30% binder. In 1970, silica sol with a small particle size of 7-8nm appeared and was used in surface coatings. However, the disadvantages of slow drying speed and low shell-making efficiency of silica sol binder restrict its rapid development. [0003] W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J11/04C09J101/02C09J103/04C09J131/04
Inventor 章浩龙
Owner 章浩龙
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