Casting coating for stainless steel valve body and preparation method thereof

A casting coating, stainless steel technology, applied in casting molding equipment, coating, mold and other directions, can solve the problems of poor surface quality of valve body castings, poor wax mold wettability, long production cycle, etc., to ensure surface quality and size. Accuracy requirements, reducing casting costs, and improving the effect of suspension

Inactive Publication Date: 2014-02-19
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The cast stainless steel valve body usually adopts the investment casting process. The coatings currently used in the investment casting mainly include water glass, silica sol, ethyl silicate, etc. The price of water glass is low, and the surface quality of the valve body castings produced is poor, and The dimensional accuracy is not high; the price of silica sol is moderate, the surface quality of the produced valve body castings is good, and the dimensional accuracy is high, but the wettability of the silica sol coating to the wax pattern is poor, the wet strength is low, the drying speed is slow, and the production cycle Longer; the castings produced by ethyl silicate coating have good surface quality and high dimensional accuracy, but they are expensive and the cost of castings is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] A kind of preparation technology for the casting paint of stainless steel valve body, it is characterized in that comprising the following steps:

[0025] Step 1: Configure the above-mentioned casting paint for stainless steel valve body;

[0026] Step 2: Prepare a hydrolyzate, pour alcohol and distilled water into the hydrolyzer and stir for 2 minutes, while stirring, add hydrochloric acid, acetic acid, sulfuric acid in turn and continue stirring for 2-3 minutes, then slowly add ethyl silicate and continue stirring for 1 hour , cooled to below 30°C by cooling water;

[0027] The third step: configure the paint, weigh the primary hydrolyzate and quartz powder according to the mass ratio of primary hydrolyzate: quartz powder is 1:2, and add the primary hydrolyzate into the paint bucket, gradually add quartz powder while stirring, and stir Evenly, let it stand for exhaust.

[0028] The composition of the casting coating for stainless steel valve body of the present inve...

Embodiment 1

[0030] A casting paint for stainless steel valve body, its composition and weight ratio are: 100% quartz powder, 20% ethyl silicate with 30% silicon dioxide content, 13% alcohol, and 36% hydrochloric acid 7%, 7% acetic acid, 7% sulfuric acid with a concentration of 95%, 3% distilled water, and 2% modified water glass. The modified water glass is obtained through the following steps: the first step: take 0.15% sodium polyacrylate solution and add it to the water glass, stir it evenly, pour it into the reaction kettle and stir for 20 minutes, then heat it to 80°C; the second step: take 2% sodium polyacrylate solution Sodium polyphosphate is added in the solution after the first step heating, is incubated 1.5h, is cooled to room temperature; Said percentage is accounted for water glass mass percentage, and the concentration of water glass is 43.82%, and modulus is 2.63, and specific gravity is 1.48g / cm3.

[0031] Pour the alcohol and distilled water in the casting coating into ...

Embodiment 2

[0033] A casting paint for stainless steel valve body, its composition and weight ratio are: 100% quartz powder, 26% ethyl silicate with 34% silicon dioxide content, 15% alcohol, and 38% hydrochloric acid 15%, 10% acetic acid, 10% sulfuric acid with a concentration of 98%, 5% distilled water, and 5% modified water glass. The modified water glass is obtained through the following steps: the first step: take 0.15% sodium polyacrylate solution and add it to the water glass, stir it evenly, pour it into the reaction kettle and stir for 30 minutes, then heat it to 90°C; the second step: take 3% sodium polyacrylate solution Add sodium polyphosphate to the solution heated in the first step, keep it warm for 3h, and cool to room temperature; the percentage is the mass percentage of water glass, the concentration of water glass is 43.82%, the modulus is 2.63, and the specific gravity is 1.48g / cm3 .

[0034] Pour the alcohol and distilled water in the casting coating into the hydrolyze...

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Abstract

The invention relates to a casting coating for a stainless steel valve body. The casting coating for the stainless steel valve body comprises the following components by weight percent: 100% of quartz powder, 20-26% of ethyl silicate with the silicon dioxide content of 30-34%, 13-15% of alcohol, 7-15% of hydrochloric acid with the concentration of 36-38%, 7-10% of acetic acid, 7-10% of sulfuric acid with the concentration of 95-98%, 3-5% of distilled water and 2-5% of modified water glass. The formula components of the casting coating for the stainless steel valve body are low in price, so that the casting cost of the valve body is reduced; the modified water glass is used as a binder, so that the suspension of the coating is greatly improved, sand sticking of a cast product is avoided, and further the requirements for the surface quality and the dimensional accuracy of the cast product are met.

Description

technical field [0001] The invention relates to a casting coating, in particular to a casting coating for a stainless steel valve body and a preparation method thereof. Background technique [0002] The casting coating is used as a barrier between the casting and the mold to achieve the purpose of anti-sticking sand. The quality of the casting depends partly on the quality of the coating. The cast stainless steel valve body usually adopts the investment casting process. The coatings currently used in the investment casting mainly include water glass, silica sol, ethyl silicate, etc. The price of water glass is low, and the surface quality of the valve body castings produced is poor, and The dimensional accuracy is not high; the price of silica sol is moderate, the surface quality of the produced valve body castings is good, and the dimensional accuracy is high, but the wettability of the silica sol coating to the wax pattern is poor, the wet strength is low, the drying speed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
Inventor 浦傲天
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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