Furane self-hardening sand

A furan self-hardening, raw sand technology, applied in casting molding equipment, molds, cores, etc., can solve the problems of weak flame retardancy, poor air permeability, low strength, etc., and achieve improved strength, improved air permeability, and high strength. Effect

Active Publication Date: 2010-12-29
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 strength, poor gas permeability and weak fla

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A kind of furan no-bake sand, comprising former sand, binder, curing agent, coupling agent and lubricant, wherein, the consumption of curing agent is 60% of binder consumption, and the consumption of coupling agent is binder consumption 0.1% of the original sand, the amount of binder is 1% of the original sand amount, the amount of lubricant is 4% of the original sand amount; the composition and weight ratio of the binder are: furan resin 70, phenolic resin 20, Polyalkylene oxide resin 5; the composition and weight ratio of the curing agent are: 60% ethyl sulfate, 20% phenolsulfonic acid, 5% phosphoric acid; the mud content of the raw sand is equal to 0.4%, and the water content is equal to 0.5%.

Embodiment 2

[0023] A furan no-bake sand, comprising former sand, binder, curing agent, coupling agent and lubricant, wherein, the consumption of curing agent is 40% of the binder consumption, and the consumption of coupling agent is 40% of the binder consumption 0.5%, the amount of binder is 1.5% of the amount of raw sand, the amount of lubricant is 2% of the amount of raw sand; the composition and weight ratio of the binder are: furan resin 60, phenolic resin 30, poly 15 alkylene oxide resin; the composition and weight ratio of the curing agent are: 70% ethyl sulfate, 30% phenolsulfonic acid, 15% phosphoric acid; the mud content of the raw sand is equal to 0.3%, and the water content is equal to 0.45%.

Embodiment 3

[0025] A kind of furan no-bake sand, comprising former sand, binder, curing agent, coupling agent and lubricant, wherein, the consumption of curing agent is 50% of binder consumption, and the consumption of coupling agent is binder consumption 0.3% of the original sand, the amount of binder is 1.2% of the original sand amount, the amount of lubricant is 3% of the original sand amount; the composition and weight ratio of the binder are: furan resin 65, phenolic resin 25, Polyalkylene oxide resin 10; the composition and weight ratio of the curing agent are: 65% ethyl sulfate, 25% phenolsulfonic acid, 10% phosphoric acid; the mud content of the raw sand is equal to 0.4%, and the water content is equal to 0.5%.

[0026] It can be seen from the above that the present invention not only has higher strength and better air permeability, but also has stronger flame retardancy.

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Abstract

The invention relates to a furane self-hardening sand, comprising crude sand, binding agent, curing agent, coupling agent and lubricating agent, wherein the dosage of the curing agent is 40-60% of that of the binding agent, the dosage of the coupling agent is 0.1-0.5% of that of the binding agent, the dosage of the binding agent is 1-1.5% of that of the crude sand, the dosage of the lubricating agent is 2-4% of that of the crude sand, and the binding agent comprises the following components according to parts by weight: 60-70 parts of furane resin, 20-30 parts of phenolic aldehyde resin, and 5-15 parts of PEO resin; the curing agent comprises the following components according to parts by weight: 60-70 parts of sulfuric acid triacetin, 20-30 parts of phenolsulfonic acid, and 5-15 parts of phosphoric acid; the soil content of the crude sand is less than or equal to 0.4%; the water content is less than or equal to 0.5%; the tensile strength of the furane self-hardening sand is more than or equal to 0.7MPa; and the gas evolution is less than or equal to 14ml/g. The invention is not only high in strength and good in permeability, but also strong in fire resistance.

Description

technical field [0001] The invention relates to a self-hardening sand, in particular to a furan no-hardening sand, which is particularly suitable for the furan no-hardening sand used in alloy sand casting. Background technique [0002] Resin self-bake sand is generally prepared by mixing silica sand, resin and hardener. Commonly used resins are furan resin, resole phenolic resin and urethane resin. The sand mold made of this kind of molding sand has high strength, accurate size, good collapsibility and low energy consumption. It can be used in the production of cast steel, cast iron and non-ferrous alloy castings. The surface quality and dimensional accuracy of the castings are high. Resin self-setting sand is a promising molding sand. [0003] The Chinese patent authorization announcement number is CN1216703C, and the invention patent issued on August 31, 2005 discloses a self-setting sand belonging to the foundry industry. It is an environmentally friendly self-setting s...

Claims

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Application Information

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