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Preparation method for phenolic resin self-hardening sand

A technology of phenolic resin and self-hardening sand, which is used in manufacturing tools, casting molding equipment, metal processing equipment, etc., can solve the problems of low removal rate of phenolic resin, poor hardening effect, easy occurrence of defects, etc. cost, the effect of improving the removal rate

Inactive Publication Date: 2016-10-26
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are some recycling methods of phenolic resin self-setting sand and old sand, and the removal rate of phenolic resin is low, resulting in poor hardening effect or prone to defects when reused

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] A preparation method of phenolic resin self-setting sand, comprising the following steps:

[0012] (1) Break 100kg of old sand, pass through a 40-mesh sieve, put the old sand into the washing tank, soak it in 300L potassium citrate solution with a mass fraction of 2%, and use ultrasonic waves during the soaking process, and the ultrasonic frequency is 25 -28KHz, after oscillating for 10 minutes, press 4m 3 Add ammonia water with a mass concentration of 6% at a flow rate of / h, the amount of ammonia water added is 235L, stir at 25°C for 12-15min, filter, remove the filtrate, and obtain pretreated sand;

[0013] (2), use the silica sand scrubbing machine to process the pretreated sand processed in step (1). When scrubbing, the feed concentration is 33%, dry the scrubbed sand, and use a magnetic separator for magnetic separation. During magnetic separation, the magnetic field strength is 0.72T to obtain secondary treated sand;

[0014] (3) Mix and stir the secondary trea...

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Abstract

The invention relates to a preparation method for phenolic resin self-hardening sand. The preparation method comprises the following steps that (1) pretreatment is conducted; (2) secondary treatment sand is prepared; (3) the secondary treatment sand and a mixed solution are mixed and stirred at the weight ratio of 1:3, suspended matters are removed, filtering is conducted, and third-time treatment sand is obtained; and (4) the third-time treatment sand obtained in the step (3) is washed and dried to obtain regenerated sand; the regenerated sand and new sand are mixed at the weight ratio of 1:0.2; the mixed sand is added into a precoated sand device, and a powder-like thermoplastic phenolic resin adhesive of which the weight accounts for 0.5% of the weight of the sand is added and stirred for 1 h at the temperature of 145 DEG C; and then petroleum calcium sulfonate of which the weight accounts for 0.08% of the weight of the sand is added, continuously stirred for 2 h and naturally cooled, so that the phenolic resin self-hardening sand is obtained. According to the preparation method for the phenolic resin self-hardening sand, old sand refurbishment is mainly used, the cost is low, and resources are saved.

Description

technical field [0001] The invention belongs to the field of casting, and in particular relates to a preparation method of phenolic resin self-setting sand. Background technique [0002] my country is a big foundry country. During casting, about 1.5 tons of old foundry sand is produced for every ton of castings cast. The annual output of used foundry sand in my country reaches more than 50 million tons. Many of them are disposed of by burial. When preparing no-hardening sand, Most of them are made of new sand, and the cost is relatively high. Although there are some recycling methods of phenolic resin self-setting sand and old sand, and the removal rate of phenolic resin is low, resulting in poor hardening effect or prone to defects when reused. Contents of the invention [0003] The purpose of the present invention is to provide a preparation method of phenolic resin no-bake sand, which mainly uses old sand to recycle and manufacture, and can meet casting requirements aft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C5/00B22C5/06B22C5/08B22C5/04
CPCB22C5/00B22C5/0409B22C5/06B22C5/08
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING