Preparation method of resin binder capable of realizing CO2 gas hardening
A technology for hardening resins and binders, applied in the field of preparation of CO2 gas hardening resin binders, which can solve the problems of resin toxicity and poor environmental conditions, and achieve the effects of low cost, easy storage, and simple tooling and equipment
Inactive Publication Date: 2015-12-30
JIUJIANG UNIVERSITY
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Problems solved by technology
Although hardening does not require heating, the resin has certain toxicity, and the hardening process releases toxic gas, and the environmental conditions are poor
Method used
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example 1
[0011] for CO 2 Binder for gas-hardening resin sand, the selected monomer concentration is 25%, the amount of initiator-ammonium persulfate added is 3% of the monomer mass, the polymerization temperature is 80°C, and the neutralization degree is 1.0 to synthesize sodium polyacrylate The resin is a binder, and its viscosity-average molecular weight is 22.4×10 4 . The molding sand mixed with it is formulated as: 100% raw sand, 0.6% resin binder, Ca(OH) 2 The amount of powder added is 3%, CO 2 Under the condition of gas hardening time of 30 seconds, the hardening strength of the molding sand is 1.2-1.4MPa.
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A preparation method of a resin binder capable of realizing CO2 gas hardening is provided; the concentration of a sodium acrylate monomer is 20-35%, ammonium persulfate is used as an initiator, the addition amount of ammonium persulfate is 2.5-3.5% of the monomer mass, and a polymerization temperature is 75-85 DEG C. The resin binder can be synthesized at atmospheric pressure, autoclaves, high temperature and complicated equipment have no need of use, the synthesis process is simple and is easy to control, no pollution gas is discharged in the synthetic process, the cost is low, and the binder is good in stability and easy to preserve.
Description
technical field [0001] The present invention relates to a CO 2 Synthesis process of gas hardening sodium polyacrylate resin. Background technique [0002] Resin binder is the main raw material for resin sand preparation. At present, the commonly used hot core box resin sand resin binders include furan resin and phenolic resin, and the commonly used furan resin mainly includes urea-furan resin, phenol-furan resin, and urea-phenol-furan copolymer. These resin binders have the advantages of high hardening strength and high speed. However, there are problems of high cost, heating required for hardening, complex recycling process and high cost, and certain toxicity and pollution problems during hardening and use. Cold box resin sand, the resin binder used (cold box resin is a two-component binder, the first is phenolic resin, the second is polyisocyanate), and the catalyst used is triethylamine or dimethyl Ethylamine. Although hardening does not require heating, the resin ha...
Claims
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IPC IPC(8): B22C1/22
Inventor 纪岗昌邢华婷何纪运陈枭王洪涛白小波
Owner JIUJIANG UNIVERSITY
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