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Easily collapsed coated sand

A technology of coated sand and raw sand, applied in the field of coated sand, can solve the problems of poor collapsibility, low thermal decomposition rate, difficulty in sand core falling out, etc. Effect

Active Publication Date: 2011-01-12
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems of low thermal decomposition rate, poor collapsibility, and difficulty in sand core shakeout in the prior art, and provide a high thermal decomposition rate, good collapsibility, and sand core fallout. Easy-to-collapse coated sand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A kind of easily collapsible coated sand, including raw sand, binder, curing agent, disintegrating agent and lubricant, wherein, the amount of curing agent is 50% of the amount of binder, and the amount of disintegrating agent is 50% of the amount of binder 40% of the original sand, the amount of binder is 6% of the original sand, the amount of lubricant is 4% of the original sand; the composition and weight ratio of the disintegrating agent are: sodium nitrate 50, sodium chloride 40, Iron oxide powder 15; the composition and weight ratio of the binder are: 60% phenolic resin, 30% polyalkylene oxide resin, 15% polyethylacrylate.

Embodiment 2

[0022] A kind of easily collapsible coated sand, including raw sand, binder, curing agent, disintegrating agent and lubricant, wherein, the amount of curing agent is 60% of the amount of binder, and the amount of disintegrating agent is the amount of binder 30% of the original sand, the amount of the binder is 12% of the original sand, and the lubricant is 2% of the original sand; the composition and weight ratio of the disintegrating agent are: 60% sodium nitrate, 30% sodium chloride Iron oxide powder 5; the composition and weight ratio of the binder are: 70% phenolic resin, 20% polyalkylene oxide resin, 5% polyethylacrylate.

Embodiment 3

[0024] A kind of easily collapsible coated sand, including raw sand, binder, curing agent, disintegrating agent and lubricant, wherein, the consumption of curing agent is 55% of that of binder, and the consumption of disintegrating agent is 55% of that of binder. 35% of the original sand, the amount of binder is 9% of the original sand amount, the amount of lubricant is 3% of the original sand amount; Iron oxide powder 10; the composition and weight ratio of the binder are: 65% phenolic resin, 25% polyalkylene oxide resin, and 10% polyethylacrylate.

[0025] It can be seen from the above that the present invention not only has a higher thermal decomposition rate and better collapsibility, but also the sand core is not easy to break and the sand core is easy to shake out.

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PUM

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Abstract

The invention discloses easily collapsed coated sand. The sand comprises crude sand, a bonding agent, a curing agent, a collapsing agent and a lubricant, wherein the using amount of the curing agent is 50 to 60 percent of that of the bonding agent; the using amount of the collapsing agent is 30 to 40 percent of that of the bonding agent; the using amount of the bonding agent is 6 to 12 percent ofthe crude sand; the using amount of the lubricant is 2 to 4 percent of the crude sand; the collapsing agent comprises the following components in part by weight: 50 to 60 percent of sodium nitrate, 30 to 40 parts of sodium chloride and 5 to 15 parts of ferric oxide powder; and the bonding agent comprises the following components in part by weight: 60 to 70 parts of phenolic resin, 20 to 30 parts of polyalkylene oxide resin and 5 to 15 parts of poly(ethyl acrylate). The easily collapsed coated sand has the advantages of relatively high thermal disintegration rate, relatively good collapsibility, difficult breaking of a sand core and simple dropping of the sand core.

Description

technical field [0001] The invention relates to a coated sand, in particular to an easily collapsed coated sand, which is particularly suitable for the production of non-ferrous metal castings with complex structures. 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 ...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/22
Inventor 浦巧生
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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