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Preparation method and application of acid-process cold core box resin for casting

A technology of cold box and resin, which is applied to casting molding equipment, molds, cores, etc., which can solve the problems of burrs, poisonous triethylamine, and poor surface quality of castings, so as to improve strength, reduce harmful components, and improve production efficiency. high efficiency effect

Active Publication Date: 2020-12-11
安徽省含山县威建铸造厂(普通合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The core sand of the triethylamine cold box method has good fluidity and the casting surface is smooth, but triethylamine is poisonous, and precautionary measures should be strengthened
However, because the resin and catalyst used are harmful to the human body; the poured castings often produce burrs, and the surface quality is poor
Therefore, the development of this core making method is relatively slow

Method used

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  • Preparation method and application of acid-process cold core box resin for casting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step, weigh the following raw materials according to the parts by weight: 42 parts of modified benzoxazine resin, 33 parts of chloroether resin, 15 parts of L-lysine diisocyanate, 22 parts of maleic anhydride, polyester resin 11 parts of softening agent, 3 parts of catalyst dibenzoyl peroxide and 1 part of sand surface modifier 2-methacrylic acid chromium chloride; the second step, resin slurry: add chlorine ether resin and maleic anhydride In the pulverizer, pulverize for 30 minutes, then pour the mixture into a high-speed mixer, add diisocyanate, catalyst, and polyester resin softener into the high-speed mixer according to the formula, and fully stir for 10 minutes to obtain a resin slurry; the third step , the resin slurry and the modified benzoxazine resin are fully mixed and stirred evenly to obtain final product. The preparation method of the modified benzoxazine is as follows: 12.8 parts of phenol, 8 parts of paraformaldehyde and 18 parts of 4- 01.1 par...

Embodiment 2

[0023]The first step, weigh the following raw materials according to the parts by weight: 39 parts of modified benzoxazine resin, 31 parts of chloroether resin, 13 parts of toluene diisocyanate, 19 parts of maleic anhydride, 9 parts of polyester resin softener , 1 part of catalyst azobisisobutyronitrile and 0.5 part of sand surface modifier vinyl benzyl aminoethyl trimethoxysilane hydrochloride; the second step, resin slurry: dichloroether resin, maleic butene di Add the acid anhydride into the pulverizer, pulverize for 20 minutes, then pour the mixture into a high-speed mixer, add diisocyanate, catalyst, and polyester resin softener into the high-speed mixer according to the formula, and fully stir for 10 minutes to obtain a resin slurry; Three steps, the resin slurry and the modified benzoxazine resin are fully mixed and stirred evenly, and the preparation method of the modified benzoxazine is as follows: 11.5 parts of phenol, 7 parts of paraformaldehyde and 17 parts of 0.6 ...

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Abstract

The invention discloses a preparation method and application of acid-process cold core box resin for casting, and belongs to the technical field of casting materials. The preparation method aims at preparing the cold core box resin for casting, which is prepared by the preparation method, with the advantages of high production efficiency, energy conservation, high sand core size precision, low gasevolution, long core box service life and small deformation. A casting is smooth in surface, high in dimensional precision, small in gas evolution, non-toxic, tasteless and unique in high-temperaturecharacteristic, a sand mold core made of cold core box resin has secondary hardening characteristic during high-temperature pouring, an acid curing gas source such as acetic acid and oxalic acid is adopted, natural decomposition is achieved, non-toxicity and harmlessness are achieved, and therefore the defects of hot cracking, burrs and the like of the casting can be prevented; and the cold corebox resin self-hardening sand has low gas evolution and good collapsibility.

Description

technical field [0001] The invention relates to the technical field of casting materials, in particular to a preparation method and application of an acid-process cold box resin for casting. Background technique [0002] Cold box resin sand is different from hot box resin sand. Cold box resin sand hardens the core sand in the core box by blowing gas or aerosol hardener at room temperature. Triethylamine cold box method, the binder is composed of thermoplastic liquid phenolic resin, toluene diisocyanate and amine catalyst. Generally speaking, the ratio of liquid phenolic resin and toluene dipolyisocyanate is 1:1, and the total amount of the two binders is 1.5% to 2.0% of the sand mass. After core shooting, triethylamine gas mist is blown in to harden the sand core. The core sand of the triethylamine cold box method has good fluidity and the surface of the casting is smooth and clean, but triethylamine is poisonous, and precautionary measures should be strengthened. "Cold bo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/22C08F259/04C08F222/06C08G14/12
CPCB22C1/2226B22C1/2233B22C1/2266C08F259/04C08G14/12C08F222/06
Inventor 徐正平徐正东
Owner 安徽省含山县威建铸造厂(普通合伙)
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