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Wet precoated sand

A technology of coated sand and wet state, applied in the field of coated sand, can solve the problems of not easy to store for a long time, small roughness, not easy to absorb moisture, etc.

Active Publication Date: 2011-01-05
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 existing in the prior art that the roughness is large, easy to absorb moisture, and not easy to store for a long time, and to provide a kind of wet coated sand with small roughness, not easy to absorb moisture, and easy to store for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of wet coated sand, including raw sand, binder, curing agent, coupling agent and lubricant, the consumption of curing agent is 50% of the binder dosage, and the consumption of coupling agent is 50% of the binder dosage 1%, the amount of binder is 5% of the amount of raw sand, and the amount of lubricant is 0.2% of the amount of raw sand; the composition and weight ratio of the binder are: phenolic resin 70, quartz powder 10, refractory Soil 5; the coupling agent is a silane coupling agent; the tensile strength of the produced wet-state coated sand is equal to 4Mpa, and the gas generation is equal to 16.

Embodiment 2

[0023] A kind of wet coated sand, including raw sand, binder, curing agent, coupling agent and lubricant, the consumption of curing agent is 70% of the binder consumption, and the consumption of coupling agent is 50% of the binder consumption 0.5%, the amount of binder is 3% of the amount of raw sand, the amount of lubricant is 0.8% of the amount of raw sand; the composition and weight ratio of the binder are: phenolic resin 80, quartz powder 20, refractory Soil 15; the coupling agent is a silane coupling agent; the tensile strength of the produced wet-state coated sand is equal to 4.2Mpa, and the gas generation is equal to 18.

Embodiment 3

[0025] A kind of wet coated sand, including raw sand, binder, curing agent, coupling agent and lubricant, the consumption of curing agent is 60% of the binder consumption, and the consumption of coupling agent is 60% of the binder consumption 0.75%, the amount of binder is 4% of the amount of raw sand, the amount of lubricant is 0.5% of the amount of raw sand; the composition and weight ratio of the binder are: phenolic resin 75, quartz powder 15, refractory Soil 10; the coupling agent is a silane coupling agent; the tensile strength of the produced wet-state coated sand is equal to 4.1Mpa, and the gas generation is equal to 19.

[0026] It can be seen from the above that the present invention not only has small roughness and strong cohesiveness, but also has good density, is not easy to absorb moisture, is not easy to absorb dryness, and can be stored for a long time in the daily environment.

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Abstract

The invention discloses wet precoated sand, which comprises raw sand, a binding agent, a curing agent, a coupling agent and a lubricating agent. The amounts of the curing agent and the coupling agent are respectively 50-70% and 0.5-1% of the amount of the binding agent; the amounts of the binding agent and the lubricating agent are respectively 3-5% and 0.2-0.8% of the amount of the raw sand; the binding agent comprises the following components in part by weight: 70-80 parts of phenolic resin, 10-20 parts of quartz powder and 5-15 parts of fire clay; the coupling agent is a silane coupling agent; and the wet precoated sand has the tensile strength not less than 4 MPa and the gas-generating amount not more than 19. The wet precoated sand not only has relatively small degree of roughness, relatively strong cohesive property, but also has relatively good density, difficult moisture absorption and difficult dryness absorption and can be stored for a long time in a daily environment.

Description

technical field [0001] The invention relates to a coated sand, in particular to a wet-state coated sand, which is particularly suitable for the production of high-precision castings. 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, sm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22
Inventor 浦巧生
Owner WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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