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Alcohol-base foundry coating for green sand mold and preparation method of alcohol-base foundry coating

A technology of foundry coating and green sand, which is used in foundry molding equipment, coatings, molds, etc., can solve the problems of sand sticking and sand inclusion in castings, high rejection rate of castings, cracking and peeling of molding sand, etc., and achieve high suspension rate. , The effect of high reinforcement capacity and high permeability

Inactive Publication Date: 2015-07-29
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low strength of the green mold sand, the coating shrinks during the drying process, which may easily cause cracking and peeling of the coating and the molding sand on the surface of the sand mold, resulting in sand sticking and sand inclusion defects in the casting. Therefore, if the coating is used improperly, the casting rejection rate is very high. high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Prepare 100 kg of alcohol-based casting coatings for green mold sand molds:

[0023] 1) Weigh 48 kg of refractory powder with a particle size of 400-600 mesh, 1.4 kg of sodium bentonite, 0.5 kg of water, 48 kg of ethanol, 1.6 kg of thermoplastic phenolic resin powder and 0.5 kg of polyvinyl butyral powder, and set aside; Among them, the refractory powder includes 24 kg of zircon powder and 24 kg of corundum powder; the viscosity of polyvinyl butyral is 320 flow seconds;

[0024] 2) Pretreating sodium bentonite and water in a mixer to form a paste;

[0025] 3) Add 400-600 mesh refractory powder, thermoplastic phenolic resin, polyvinyl butyral and the paste obtained in step 2) into the mixer, then weigh 12 kg of ethanol and pour it into the mixer, cover Seal the lid well, start the mixer, and mix for 2 hours to get a paste coating;

[0026] 4) Take out the paste paint obtained in step 3) and put it into a mixing bucket with a sealed cover, add 36 kg of ethanol, stir and...

Embodiment 2

[0031] Prepare 100 kg of alcohol-based casting coatings for green mold sand molds:

[0032] 1) Weigh 44 kg of refractory powder with a particle size of 400-600 mesh, 1.3 kg of sodium bentonite, 0.6 kg of water, 52 kg of ethanol, 1.5 kg of thermoplastic phenolic resin powder and 0.6 kg of polyvinyl butyral powder, and set aside; Among them, the refractory powder includes 10 kg of mullite powder, 20 kg of corundum powder, and 14 kg of bauxite; the viscosity of polyvinyl butyral is 330 flow seconds;

[0033] 2) Pretreating sodium bentonite and water in a mixer to form a paste;

[0034] 3) Add 400-600 mesh refractory powder, thermoplastic phenolic resin, polyvinyl butyral and the paste obtained in step 2) into the mixer, then weigh 13 kg of ethanol and pour it into the mixer, cover Seal the lid well, start the mixer, and mix for 2.5 hours to get a paste coating;

[0035] 4) Take out the paste paint obtained in step 3) and put it into a mixing bucket with a sealed cover, add 39 k...

Embodiment 3

[0040] Prepare 100 kg of alcohol-based casting coatings for green mold sand molds:

[0041] 1) Weigh 55 kg of refractory powder with a particle size of 400-600 mesh, 1.45 kg of sodium bentonite, 0.55 kg of water, 41 kg of ethanol, 1.4 kg of thermoplastic phenolic resin powder and 0.6 kg of polyvinyl butyral powder, and set aside; Among them, the refractory powder includes 35 kg of zircon powder, 5 kg of mullite powder, 10 kg of corundum powder, and 5 kg of bauxite; the viscosity of polyvinyl butyral is 325 flow seconds;

[0042] 2) Pretreating sodium bentonite and water in a mixer to form a paste;

[0043] 3) Add 400-600 mesh refractory powder, thermoplastic phenolic resin, polyvinyl butyral and the paste obtained in step 2) into the mixer, then weigh 10.25 kg of ethanol and pour it into the mixer, cover Seal the lid well, start the mixer, and mix for 3 hours to get a paste coating;

[0044] 4) Take out the paste paint obtained in step 3) and put it into a mixing bucket with a...

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Abstract

The invention discloses an alcohol-base foundry coating for a green sand mold and a preparation method of the alcohol-base foundry coating. The coating comprises components in percentage by weight as follows: 44%-55% of 400-600-mesh refractory powder, 1.30%-1.45% of sodium bentonite, 0.45%-0.60% of water, 0.5%-0.7% of polyvinyl butyral, 1.4%-1.6% of thermoplastic phenolic resin and 41%-52% of ethanol. The preparation method comprises steps as follows: 1), raw materials are weighed in proportion; 2), sodium bentonite and water are ground and preprocessed to form paste; 3), the 400-600-mesh refractory powder, the thermoplastic phenolic resin and the polyvinyl butyral are mixed with the paste obtained in the step 2), the ethanol accounting for 25% of total weight of ethanol is added for mixing grinding, and a pasty coating is obtained; 4), the remained ethanol is added and stirred to obtain the coating. The alcohol-base foundry coating has high suspension rate and high permeability, the surface strength of the sand mold can be enhanced, the coating breathability is good and avoids cracking and peeling, and casting is not stuck with sand.

Description

technical field [0001] The invention relates to an alcohol-based casting coating for a green sand mold, in particular to an alcohol-based casting coating for a green sand mold and a preparation method thereof. Background technique [0002] The production technology and process of green sand casting steel is an advanced method abroad. In recent years, it has also been applied in China. The advantages of this process are high utilization rate of old sand, short production cycle and low production cost. However, for this process The sand mold coating used is very demanding. [0003] Because green sand molds are used to produce cast steel, there are at least the following problems that need to be addressed: First, green sand molds are traditionally used to produce cast iron, and green sand has low strength compared with sodium silicate sand and resin sand. Many, can not withstand the erosion of high-temperature molten steel, so the use of paint is required not to damage the str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C3/00
CPCB22C3/00
Inventor 张友寿黄晋李四年龙威夏露陈爱平
Owner HUBEI UNIV OF TECH
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