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Phenolic resin self-hardening sand and preparation method thereof

A technology of phenolic resin and no-bake sand, which is applied in the manufacture of tools, casting molding equipment, metal processing equipment, etc., can solve the problems of unreal filling, reduced strength, poor fluidity of coarse silica sand, etc., achieve less gas generation and improve moisture resistance Good effect with compressive strength and hardening effect

Active Publication Date: 2014-11-12
WUJIANG HYDRAULIC COMPONENTS FOUNDRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resin no-bake sand of this invention has high strength, good air permeability and a small amount of gas generation, but the coarse silica sand has poor fluidity, which will lead to poor filling and reduced strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In this embodiment, a phenolic resin no-bake sand is made of the following raw materials in parts by weight: 100 parts of raw sand, 30 parts of phenolic resin, 1.5 parts of silane coupling agent, 4 parts of methyl formate, and 5 parts of calcium carbonate , 1.5 parts of aluminate, 14 parts of ethylene glycol, 12 parts of bentonite and 8 parts of polyamide. The raw sand passes through a 250-mesh sieve, the average particle shape coefficient is less than or equal to 1.4, and the raw sand is composed of pearl sand and silica sand at a weight ratio of 1:5, and the moisture content in the raw sand is less than 0.2%. The bentonite is sodium bentonite and passed through a 300-mesh sieve. The phenolic resin is an alkaline phenolic resin.

[0018] The preparation method of a kind of phenolic resin no-bake sand, mixes the raw sand passing through 250 mesh and bentonite passing through a 300 mesh sieve, and successively adds phenolic resin, silane coupling agent, polyamide, calci...

Embodiment 2

[0020] In this embodiment, a phenolic resin no-bake sand is made of the following raw materials in parts by weight: 100 parts of raw sand, 20 parts of phenolic resin, 1 part of silane coupling agent, 2 parts of methyl formate, and 8 parts of calcium carbonate , 1 part of aluminate, 10 parts of ethylene glycol, 16 parts of bentonite and 5 parts of polyamide; wherein, the weight ratio of phenolic resin to aluminate is 20:1, and the weight ratio of aluminate to silane coupling agent is 1:1. The raw sand passes through a 250-mesh sieve, and the average particle shape coefficient is less than or equal to 1.4, and the raw sand is composed of pearl sand and silica sand in a weight ratio of 1:5. The moisture content in the raw sand is less than 0.2%. The bentonite is sodium bentonite and passed through a 300-mesh sieve. The phenolic resin is an alkaline phenolic resin.

[0021] The preparation method of a kind of phenolic resin no-bake sand, mixes the raw sand passing through 250 m...

Embodiment 3

[0023] In this embodiment, a phenolic resin no-bake sand is made of the following raw materials in parts by weight: 100 parts of raw sand, 26 parts of phenolic resin, 1.3 parts of silane coupling agent, 3 parts of methyl formate, and 6 parts of calcium carbonate , 1.3 parts of aluminate, 12 parts of ethylene glycol, 14 parts of bentonite and 7 parts of polyamide; wherein, the weight ratio of phenolic resin to aluminate is 20:1, and the weight ratio of aluminate to silane coupling agent is 1:1. The raw sand passes through a 250-mesh sieve, and the average particle shape coefficient is less than or equal to 1.4, and the raw sand is composed of pearl sand and silica sand in a weight ratio of 1:5. The moisture content in the raw sand is less than 0.2%. The bentonite is sodium bentonite and passed through a 300-mesh sieve. The phenolic resin is an alkaline phenolic resin.

[0024] The preparation method of a kind of phenolic resin no-bake sand, mixes the raw sand passing through...

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PUM

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Abstract

The invention discloses phenolic resin self-hardening sand and a preparation method thereof. The self-hardening sand is made of roughing sand, phenolic resin, a silane coupling agent, methyl formate, calcium carbonate, aluminic acid ester, ethylene glycol, bentonite and polyamides. The rough sand passing through a 250-mesh screen and the bentonite passing through a 300-mesh screen are mixed, then the phenolic resin, the silane coupling agent, the polyamide, the calcium carbonate, the aluminic acid ester, the ethylene glycol and the methyl formate are added in sequence, rapid stirring is carried out until the materials are mixed fully, and the stirring speed is 129 r / min. The preparation method is simple, the prepared phenolic resin self-hardening sand is small in gas generating amount and does not contain harmful elements of nitrogen, phosphorus, sulphur or the like, the hardening effect is good, and under the condition that the roughing sand is at ambient temperature, the hardening time is 15 to 20 min; the intensity is high, after hardening is conducted for 24 hours, the compressive strength is 7.4 to 8.5 MPa, compared with the self-hardening sand in the prior art, the occurrence rate of the heat crack phenomenon is reduced by 18 percent, and the phenolic resin self-hardening sand is especially suitable for casting of steel castings.

Description

technical field [0001] The invention relates to a phenolic resin self-setting sand and a preparation method thereof, belonging to the technical field of 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 application number is 201010152282.9 "Resin No-bake Sand for Magnesium Alloy Sand Casting and Its Preparation Method", which discloses a no-bake sand whose components by weight percentage are: fine silica sand 51-100%, coarse silica sand 0-50%, The amount of resin added ...

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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