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Novel easily collapsible precoated sand and preparation method thereof

A new type of coated sand technology, applied in foundry molding equipment, molds, cores, etc., can solve the problems of difficulty in cleaning falling sand, increase labor intensity, poor heat resistance, etc., achieve good fluidity, enhance fluidity, good thermal conductivity

Inactive Publication Date: 2015-08-19
MAANSHAN HENGYI MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The coated sand in the prior art has poor heat resistance, large roughness, easy sand sticking on the casting, poor collapsibility, and extremely difficult cleaning of falling sand, which increases labor intensity

Method used

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Examples

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Embodiment Construction

[0014] The present invention will be described in detail below through specific examples.

[0015] A new type of easily collapsible coated sand, made of the following raw materials in parts by weight (kg): thermoplastic phenolic resin 4, polyoxymethylene 1, crosslinking agent TAC 1, water 2.5, urotropine 0.8, quartz sand 80, two Molybdenum sulfide 3, diatomite 8, calcium peroxide 0.4, calcium stearate 0.25, synergist 5;

[0016] The synergist is prepared from the following raw materials in parts by weight (kg): 4 corn stalks, 2 starch, 3 water glass, 1.5 calcium hydroxide, 1 magnesium chloride, 4 graphene, 20 clay, 9 zircon powder, and Dibutyl phthalate 3, water 9; the preparation method is as follows: dry the corn stalks and crush them into 100-mesh powder, mix them with pottery clay and starch, mix them evenly, add water and stir them evenly, control the temperature at 60°C-80°C, and keep it for 1 hour , then add the remaining ingredients except water glass and dibutyl phth...

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PUM

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Abstract

The invention discloses novel easily collapsible precoated sand, which is characterized by being made of the following raw materials in parts by weight: 4 to 6 parts of thermoplastic phenolic resin, 1 to 2 parts of polyformaldehyde, 1 to 1.5 parts of cross-linking agent TAC, 2.5 to 3 parts of water, 0.8 to 1.2 parts of urotropine, 80 to 90 parts of silica sand, 3 to 5 parts of molybdenum disulfide, 8 to 11 parts of kieselguhr, 0.4 to 0.7 parts of calcium peroxide, 0.25 to 0.35 parts of calcium stearate and 5 to 7 parts of synergists. The synergists made by a special process are added, so liquidity, breathability, heat dispersion and strength of the precoated sand are enhanced, and the surface is compact and is not easy to crack and deform; the components for enhancing the liquidity and breathability, including the molybdenum disulfide, the kieselguhr and the like, and the collapsing components including the calcium peroxide and the like are also added, and the polyformaldehyde and the thermoplastic phenolic resin are mixed to increase product strength, so the made precoated sand is high temperature resistant, easily collapsible, small in sand burning possibility, free of shell mould delamination, good in thermal conductivity and liquidity, and is smooth in casting surface.

Description

technical field [0001] The invention relates to the technical field of molding sand, in particular to a novel easily collapsible coated sand and a preparation method thereof. Background technique [0002] Coated sand refers to the molding sand or core sand that is covered with a solid resin film on the surface of the sand grains before molding. In recent years, the production process of thermal coated sand has been widely used, that is, preheat the sand to a certain temperature, add resin to melt it, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, Cool, crush and sieve to obtain coated sand. Due to the advantages of high strength, low gas generation, high dimensional accuracy of production castings, smooth surface and easy storage, coated sand has been widely used in recent years. The coated sand in the prior art has poor heat resistance, large roughness, easy sand sticking on castings, poor collapsibility, and extremely di...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/02
Inventor 章功国王泾文段宗银李纯金陈超王淑妍张少伍王晓芬谢勇
Owner MAANSHAN HENGYI MACHINERY MFG
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