Polymer-modified silicasol and manufacturing method thereof

A manufacturing method and technology of silica sol, applied in the direction of manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of shortening the drying time of the investment casting shell and reducing the residual strength, etc., to achieve excellent dehydration performance and reduce residual strength and shortening of drying time

Active Publication Date: 2012-09-26
GUANGDONG WELL SILICASOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production and application, the effects of shortening the drying time between investment casting shells, increasing the strength at room temperature and reducing the residual strength cannot be achieved significantly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A polymer-modified silica sol, containing alkaline silica sol and polyvinylpyrrolidone, wherein the SiO in the alkaline silica sol 2 The mass percent of the polymer-modified silica sol is 25.0%, and the mass percent of polyvinylpyrrolidone in the polymer-modified silica sol is 1.0%. The pH value of the polymer-modified silica sol is 10.0, and the molecular weight of the polyvinylpyrrolidone is 10,000-200,000.

[0020] The preparation method of the above-mentioned polymer-modified silica sol: take 10 g of polyvinylpyrrolidone (PVP) with a molecular weight of 10,000 to 200,000, add 90 g of deionized water, and vigorously stir at room temperature for 30 to 60 minutes to completely dissolve the PVP to obtain PVP solution. In addition, take 833.3g of ordinary silica sol of the model S-1430A produced by Dongguan Huihe Silicon Products Co., Ltd., adjust the pH value to 10.0 with dilute hydrochloric acid or saturated calcium chloride solution according to the actual pH value o...

Embodiment 2

[0022] A polymer-modified silica sol, containing alkaline silica sol and polyvinylpyrrolidone, wherein the SiO in the alkaline silica sol 2 The mass percent of the polymer-modified silica sol is 25.0%, and the mass percent of polyvinylpyrrolidone in the polymer-modified silica sol is 2.0%. The pH value of the polymer-modified silica sol is 9.5, and the molecular weight of the polyvinylpyrrolidone is 10,000-200,000.

[0023] The preparation method of the above-mentioned polymer-modified silica sol: take 20 g of polyvinylpyrrolidone (PVP) with a molecular weight of 10,000 to 200,000, add 80 g of deionized water, and vigorously stir at room temperature for 30 to 60 minutes to completely dissolve the PVP to obtain PVP solution. Another 833.3 g of ordinary silica sol of model S-1430A produced by Dongguan Huihe Silicon Products Co., Ltd. was used to adjust the pH value to 9.5 with dilute hydrochloric acid, and a certain amount of deionized water was added to obtain 900 g of alkalin...

Embodiment 3

[0025] A polymer-modified silica sol, containing alkaline silica sol and polyvinylpyrrolidone, wherein the SiO in the alkaline silica sol 2 The mass percent of the polymer-modified silica sol is 25.0%, and the mass percent of polyvinylpyrrolidone in the polymer-modified silica sol is 2.0%. The pH value of the polymer-modified silica sol is 10.0, and the molecular weight of the polyvinylpyrrolidone is 10,000-200,000.

[0026] The preparation method of the above-mentioned polymer-modified silica sol: take 20 g of polyvinylpyrrolidone (PVP) with a molecular weight of 10,000 to 200,000, add 80 g of deionized water, and vigorously stir at room temperature for 30 to 60 minutes to completely dissolve the PVP to obtain PVP solution. In addition, take 833.3g of ordinary silica sol of the model S-1430A produced by Dongguan Huihe Silicon Products Co., Ltd., adjust the pH value to 10.0 with dilute hydrochloric acid or saturated calcium chloride solution according to the actual pH value o...

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PUM

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Abstract

The invention provides polymer-modified silicasol which contains alkaline silicasol and polyvinyl pyrrolidone, wherein the weight percent of SiO2 in the alkaline silicasol in the polymer-modified silicasol is 20.0-36.0%, and the weight percent of the polyvinyl pyrrolidone in the polymer-modified silicasol is 0.1-5.0%. The preparation method comprises the following steps: (1) preparing a polyvinylpyrrolidone water solution; (2) preparing the alkaline silicasol; and (3) uniformly mixing the solutions prepared in step (1) and step (2) according to the required ratio to obtain the polymer-modified silicasol. The polymer-modified silicasol can obviously shorten the drying time of the investment casting shell-making interlayers, effectively increases the normal-temperature strength of a wax pattern shell, decreases the retained strength of the wax pattern shell without influencing the hot strength of the vax pattern shell, has the advantages of simple preparation method and low cost, and is applicable to popularization and application.

Description

technical field [0001] The invention belongs to an adhesive composite material and a manufacturing method thereof, in particular to a polymer-modified silica sol and a manufacturing method thereof. Background technique [0002] Silica sol is a colloidal solution in which silica particles are evenly dispersed in water, also known as silicic acid sol, or silica hydrosol. It is an inorganic polymer adhesive with excellent performance and is widely used in different industrial fields. Investment casting in the investment casting industry uses a wax model shell, and silica sol is used as an adhesive for the wax model shell. The wax model shell must be coated with slurry and sanded several times, and the sand layer is passed through silica sol and mullite powder. The constituent slurries bond together and the drying time intervals between the different sanding layers determine the productivity and economics of investment casting. [0003] In order to adapt to the requirements of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/18
Inventor 王国顺罗琼陈连喜李杨
Owner GUANGDONG WELL SILICASOL
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