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Mending paste special for lost foam casting

A technology of lost foam casting and repair paste, which is applied in casting and molding equipment and other directions, can solve the problems of inability to ensure the quality of castings, high pyrolysis residues, and low strength of repair paste, so as to solve the wrinkle defects and improve competition. Ability, effect of good surface finish

Inactive Publication Date: 2011-05-18
郑宝安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently used repair paste has low strength, poor moldability, large gas generation, and many pyrolysis residues, so the quality of castings cannot be well guaranteed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A special repair paste for lost foam casting is characterized in that its components and weight content are as follows:

[0011] Stearic acid 800g, paraffin wax 200g, polyethylene glycol 150g, sodium hydroxide 50g, water 400g. Wherein the melting point of stearic acid is 70-71° C., the freezing point is 54-57° C., the viscosity of polyethylene glycol is 37-45 Pa.s, and the hydroxyl value is 268-249 mgKOH / g.

Embodiment 2

[0013] A special repair paste for lost foam casting is characterized in that its components and weight content are as follows:

[0014] Stearic acid 700g, paraffin 300g, polyethylene glycol 200g, sodium hydroxide 40g, water 500g. Wherein the melting point of stearic acid is 70-71° C., the freezing point is 54-57° C., the viscosity of polyethylene glycol is 37-45 Pa.s, and the hydroxyl value is 268-249 mgKOH / g.

Embodiment 3

[0016] A special repair paste for lost foam casting is characterized in that its components and weight content are as follows:

[0017] Stearic acid 750g, paraffin wax 250g, polyethylene glycol 100g, sodium hydroxide 45g, water 450g. Wherein the melting point of stearic acid is 70-71° C., the freezing point is 54-57° C., the viscosity of polyethylene glycol is 37-45 Pa.s, and the hydroxyl value is 268-249 mgKOH / g.

[0018] The preparation method of the above-mentioned special repair paste for lost foam casting: mix stearic acid, paraffin, polyethylene glycol, and water into a steel vessel, then heat, add sodium hydroxide after the stearic acid and paraffin are completely dissolved, and stir Let stand to room temperature to form.

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Abstract

The invention relates to a mending paste special for lost foam casting, comprising the following components in parts by weight: 70-80 parts of stearic acid, 20-30 parts of paraffin, 10-20 parts of polyethylene glycol, 4-5 parts of sodium hydroxide and 40-50 parts of water, wherein the melting point of stearic acid is 70-71 DEG C, the freezing point is 54-57 DEG C, the viscosity of polyethylene glycol is 37-45Pa.s and the hydroxyl value is 268-249mgKOH / g. The mending paste has the advantage of good forming property and levelling property, high strength, good surface glossiness, low gas generation and good residue decomposition property at high temperature.

Description

technical field [0001] The invention belongs to a chemical product, in particular to a special repair paste for lost foam casting. Background technique [0002] Lost foam casting is a casting process in which polystyrene is used to make a foam model. Under negative pressure, molten iron is used to vaporize the foam model and replace the space occupied by the foam model, and then cooled to form a casting. Because foam models tend to be scrapped due to defects such as poor surface fusion during the manufacturing process, a layer of repair paste is usually applied to the defective surface to repair the defects. The repair paste currently used has low strength, poor moldability, large gas generation, and many pyrolysis residues, so the quality of the casting cannot be well guaranteed. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the deficiencies and shortcomings of the above-mentioned prior art, and provide a sp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C7/02
Inventor 郑宝安
Owner 郑宝安
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