High-quality molding sand
A kind of molding sand, high-quality technology, applied in the direction of casting molds, cores, casting molding equipment, etc., can solve the problems of poor air permeability of sand molds, rough surface of aluminum sand parts, poor finish, etc., to improve the preservation time and quality, process Short time, high surface quality results
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[0035] A preparation method of high-quality molding sand is prepared by the following production steps:
[0036] 1) Evenly mix quartz sand, clay, modified sodium bentonite, aluminum sulfate, modified thermoplastic phenolic resin, diatomaceous earth, carboxymethyl cellulose, sodium tripolyphosphate, treated urotropine and starch mixture Afterwards, stir 20 minutes with 500r / min rotating speed;
[0037] 2) Mix sodium silicate, tributyl citrate, polyvinyl acetate, lignocellulose, nano-attapulgite, and brown corundum powder evenly together, and stir for 15 minutes at a speed of 200r / min;
[0038] 3) Grind titanium dioxide and coconut shell activated carbon to a particle size of 0.1-0.2mm, and mix evenly with the materials in 2), stir to disperse, heat to 55°C, and stir at 150r / min for 15 minutes;
[0039] 4) After uniformly mixing the materials in 1) and the materials obtained in 3), add water, stir at a speed of 300r / min for 40 minutes, and mix with water for 15 minutes to make ...
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