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Silicon-sol adhesive and preparing method

A manufacturing method and technology of silica sol, which is applied in the direction of manufacturing tools, casting molding equipment, casting molds, etc., can solve the problems of rising costs, cumbersome processes, and rising prices

Inactive Publication Date: 2003-08-27
ZHEJIANG YUDA CHEM IND
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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 performance modification of silica sol mentioned in the patent will not only bring cumbersome processes, but also increase costs and lower selling 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

preparation example Construction

[0016] (1) The preparation of PVA aqueous solution, preparation step is as follows;

[0017] a. According to the required concentration of PVA, calculate the required solution, the amount of water to be added, and the amount of PVA;

[0018] b. Add 85-95% of the calculated amount of water into the container, slowly add PVA under stirring at 70-100 rpm at room temperature, and fully stir for about 15 minutes to fully disperse it;

[0019] c. Wash the solids on the mixing blade or the container wall, and continue to stir the mixture until the PVA particles and water are evenly dispersed;

[0020] d. Heat the solution to about 90°C and continue stirring for 30-60 minutes to fully dissolve the PVA;

[0021] e. cooling to room temperature or near room temperature while stirring;

[0022] f. Add water to the calculated amount, stir well and set aside.

[0023] (2) the preparation of alkaline silica sol, conventional common silica sol all can satisfy the requirement of the present...

Embodiment 1

[0028] Embodiment 1: get PVA0.6 gram, add 5.4 gram of water, be mixed with the aqueous solution that 6 grams contain 10% PVA for subsequent use. Take 32% SiO 2 100 grams of alkaline silica sol with a pH value of 10.5, treated with an ion exchange resin treated with 5% dilute hydrochloric acid to make the pH value to 9.5, take 94 grams of the solution, and slowly add it to the prepared solution under continuous stirring 6 grams of PVA in water. Obtain 100 grams of silica sol binder of the present invention after mixing, its SiO 2 The content is 30%, the PVA content is 0.6%, and the pH value is 9.5.

[0029] According to this embodiment, replace the ion exchange resin treated with 5% dilute hydrochloric acid with 5% dilute sulfuric acid to treat the ion exchange resin containing 32% SiO 2 , The alkaline silica sol with a pH value of 10.5 can obtain the same silica sol binder as above, and its use effect is also the same as that of the above silica sol binder.

[0030] Simila...

Embodiment 2

[0032] Embodiment 2: get PVA 0.4 gram, add 5.6 gram of water, be mixed with the aqueous solution that 6 gram contains 6.7% PVA for subsequent use. Take 32% SiO 2 100 grams of alkaline silica sol with a pH value of 10.5, treated with an ion exchange resin treated with 5% dilute hydrochloric acid to make the pH value to 9.5, take 94 grams of the solution, and slowly add it to the prepared solution under continuous stirring 6 grams of PVA in water. Obtain 100 grams of silica sol binder of the present invention after mixing, its SiO 2 The content is 30%, the PVA content is 0.4%, and the pH value is 9.5.

[0033] According to this embodiment, replace the ion exchange resin treated with 5% dilute hydrochloric acid with 5% dilute sulfuric acid to treat the ion exchange resin containing 32% SiO 2 , The alkaline silica sol with a pH value of 10.5 can obtain the same silica sol binder as above, and its use effect is also the same as that of the above silica sol binder.

[0034] Simi...

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PUM

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Abstract

The present invention discloses a silicon sol adhesive modified by using high polymer and its preparation method. Its composition comprises alkaline silicon sol containing 20-30%, SiO2 and PVA whose content is less than [(32-100XSiO2%) / 320]X100%. Its preparation method includes: a. preparing PVA aqueous solution; b. preparing alkaline silicon sol solution; and c. mixing said two solution uniformly, in which after the alkaline silicon sol solution is prepared or after the two solutions are mixed uniformly its pH value must be regulated. Said silicon sol adhesive can accelerate drying speed when it is used in investment casting industry, and can raise the normal temp. strength of pattern shell in the investment casting, and can reduce retained strength.

Description

technical field [0001] The invention belongs to adhesive composite materials and a manufacturing method thereof, in particular to a high polymer modified silica sol adhesive 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 particle diameter is 12-15nm, SiO 2 30% binder. In 1970, silica sol with small particle size of 7-8nm appeared, which was used in surface coating. However, the disadvantages of slow drying speed and low shell-making efficiency of silica sol binder restrict its rapid development. [0003] With ...

Claims

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Application Information

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IPC IPC(8): B22C1/22
Inventor 章浩龙
Owner ZHEJIANG YUDA CHEM IND
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