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Caking agent

A technology of binder and surfactant, which is applied in the field of molding sand binder and molding materials in the field of foundry, and can solve the problems of poor sand mold collapse and difficult recycling of old sand.

Active Publication Date: 2013-08-21
JINAN SHENGQUAN GRP SHARE HLDG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is: to overcome the defects of poor collapsibility of sand molds made of water glass binder in the prior art and difficult recycling of old sand, and to provide a method that can improve the collapsibility of sand molds and realize the use of old sand Fully recycled binder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 80 kg of water glass into the YT22 high-speed disperser (manufactured by Sichuan Yongtong Machinery Equipment Co., Ltd.), start stirring, slowly add 10 kg of polyacrylamide solution, 4 kg of sodium tetraborate, and 3 kg of sodium stearate, and mix for two hours Finally, the binder S1 is obtained.

[0029] Among them, the modulus M of water glass is 2.6, and the density is 1.35g / cm 3 ; The number average molecular weight of polyacrylamide is 3 million, and the weight percentage of polyacrylamide in its aqueous solution is 35wt%.

[0030] In this example, by controlling the number-average molecular weight of polyacrylamide to 3 million and making it into an aqueous solution with a concentration of 35 wt%, the temperature at high temperature (referring to the temperature during casting, such as the temperature during casting aluminum alloy is 500-700°C) is greatly improved. The decomposable high molecular content makes the sand mold prepared with this binder have exce...

Embodiment 2

[0033] Add 88 kg of water glass into the YT22 high-speed disperser (manufactured by Sichuan Yongtong Machinery Equipment Co., Ltd.), start stirring, slowly add 5 kg of polyacrylamide solution, 3 kg of sodium tripolyphosphate, 4 kg of potassium stearate, mix two Binder S2 was obtained after 1 hour.

[0034] Among them, the modulus M of water glass is 1.9, and the density is 1.6g / cm 3 ; The number average molecular weight of polyacrylamide is 1 million, and the weight percentage of polyacrylamide in its aqueous solution is 45wt%.

Embodiment 3

[0036] Add 50 kilograms of water glass into the YT22 high-speed disperser (manufactured by Sichuan Yongtong Machinery Co., Ltd.), start stirring, and slowly add 15 kilograms of polymethacrylamide solution, 5 kilograms of sodium hexametachlorate, and 5 kilograms of potassium stearate , to obtain binder S3 after mixing for two hours.

[0037] Among them, the modulus M of water glass is 3.5, and the density is 1.5g / cm 3 ; The number average molecular weight of polyacrylamide is 5 million, and the weight percentage of polyacrylamide in its aqueous solution is 20wt%.

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Abstract

The invention relates to a caking agent, which comprises the key components according to the parts by weight: 50-90 parts of water glass, 3-15 parts of water solution of strong hydrophilicity organic polymer materials, 0-5 parts of water-solubility inorganic modifier, and 0.1-5 parts of surface active agent; wherein, the modulus M of the water glass is 1.9-3.5, and the density is 1.1-1.6g / cm<3>; the number average molecular weight of high molecular is 0.5-22 million; the weight percentage composition of high molecular in the water solution is 5-55wt%. Sand mold prepared by using the caking agent is characterized by hot air hardening, wet hygrometric state cleaning, and caking agent reusage, and has the advantages of good collapsibility and can realize complete recovery and reuse of old sand.

Description

technical field [0001] The invention belongs to molding materials in the casting field, in particular to molding sand binders in the casting field. Background technique [0002] At present, in the foundry field, molding sand binders are mainly divided into two categories, one is an organic binder mainly composed of furan resin and phenolic resin, and the other is an inorganic binder mainly composed of water glass. Due to factors such as strong pungent smell, serious environmental pollution, and higher prices of organic resins, the use of organic binders is greatly restricted; compared with this, inorganic binders based on water glass have the ability to produce no irritation The advantages of non-toxic gas, no black pollution, and low price. However, there are two major problems in the process of using the sand mold prepared by using water glass as a binder in the molding sand: (1) the mold residual strength is high after the sand mold is poured, the sand mold collapse is p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/18
Inventor 祝建勋许增彬
Owner JINAN SHENGQUAN GRP SHARE HLDG CO LTD
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