Easily-scattered precoated sand and preparation method thereof

A technology of coating sand and starch, applied in the field of foundry industry, can solve the problems of poor fluidity and sticky sand, and achieve the effects of reasonable formula, simple preparation method and improved fluidity

Active Publication Date: 2014-12-24
广东越翼包装材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this invention has high strength and high temperature resistance, it has poor fluidity and is easy to stick sand on castings.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] In this embodiment, a kind of easily collapsible coated sand is made of the following raw materials in parts by weight: 100 parts of raw sand, 4 parts of silane coupling agent, 1.5 parts of binder, 0.5 part of curing agent, 1 part of additive and 1.5 parts of lubricant; the former sand passes through a 300-mesh sieve and is composed of 80% new sand and 20% old sand, and the parts by weight of each component in the binder are respectively: 20 parts of epoxy resin, clay 8 parts, 18 parts of silicone oil and 15 parts of modified starch. The parts by weight of each component in the curing agent are respectively: 30 parts of polyethylene polyamine, 7 parts of polyurethane and 4 parts of fatty amine. The parts by weight of each component in the additive are: 30 parts of boron carbide, 12 parts of ethyl acetate and 4 parts of sugar alcohol. The modified starch is obtained by the following steps: placing the starch at a temperature of 52°C After fully stirring and mixing evenl...

Embodiment 2

[0027] In this embodiment, a kind of easily collapsible coated sand is made of the following raw materials in parts by weight: 100 parts of raw sand, 2 parts of silane coupling agent, 2.5 parts of binder, 0.1 part of curing agent, 3 parts of additives and 1.5 parts of lubricant; the former sand passes through a 300-mesh sieve and is composed of 80% new sand and 20% old sand; the parts by weight of each component in the binder are respectively: 30 parts of epoxy resin, clay 5 parts, 12 parts of silicone oil and 20 parts of modified starch. The parts by weight of each component in the curing agent are respectively: 30 parts of polyethylene polyamine, 4 parts of polyurethane and 7 parts of fatty amine. The parts by weight of each component in the additive are respectively: 20 parts of boron carbide, 18 parts of ethyl acetate and 2 parts of sugar alcohol. The modified starch is obtained through the following steps: put the starch in water at a temperature of 48°C, stir and mix we...

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Abstract

The invention discloses easily-scattered precoated sand and a preparation method thereof. The easily-scattered precoated sand is prepared from the following raw materials in parts by weight: crude sand, a silane coupling agent, a bonding agent, a curing agent, an additive and a lubricating agent, wherein the crude sand is screened by a 300-mesh sieve, and consists of 80% of fresh sand and 20% of used sand. The preparation method comprises the following steps: (1) preparing the bonding agent, namely, putting epoxy resin and modified starch into a stirrer, stirring, sequentially feeding clay and silicone oil, and stirring for 20-40 minutes to obtain the bonding agent; (2) preparing the curing agent, namely, feeding polyethylene polyamine, polyurethane and fatty amine into a ball mill in parts by weight, and carrying out dry ball-milling for 60-80 minutes to obtain the curing agent; (3) mixing, namely, heating the crude sand up to 35-40 DEG C, then putting the heated crude sand into a sand mixer, feeding the bonding agent, the silane coupling agent and the lubricating agent, and fully mixing; then, feeding the additive under at room temperature; and finally, feeding the curing agent and fully mixing to obtain the precoated sand.

Description

technical field [0001] The invention relates to a collapsible coated sand and a preparation method thereof, belonging to the technical field of foundry industry. 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. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand grains, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to melt, 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. For steel castings and iron castings. Due to the advantages of high strength, low gas generation, high dimensional accuracy of production castings, smooth surface and easy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/16B22C1/02
Inventor 浦巧生
Owner 广东越翼包装材料科技有限公司
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