Easy-to-demould precoated sand and production process of easy-to-demould precoated sand
A technology of coated sand and easy demoulding, which is applied in the direction of manufacturing tools, metal processing equipment, casting molding equipment, etc., can solve the problems of high friction resistance between molds and sand cores, increase production costs, and reduce production efficiency, so as to improve production Effects of efficiency, friction reduction, high yield and yield
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Example Embodiment
[0017] Example one:
[0018] In this embodiment, the easy-release coated sand includes 100kg raw sand, the raw sand is silica sand for foundry; the anti-mucosal liquid is pitch-kerosene liquid, which is 0.1kg; 0.1kg flake graphite powder; 2.0kg novolak resin; 2kg hexamethylenetetramine solution with a concentration of 15%; 0.1kg calcium stearate.
[0019] The production of the present invention is as follows: heat 100kg raw sand to 150~160℃, put it into the sand mixer that has started, add 0.1kg pitch-kerosene liquid, mix for 10s, add 0.1kg flake graphite powder and mix for 10s, add 2.0kg Novolac resin, mix for 40s and blow in cold air for 15s, then add 2kg of hexamethylenetetramine solution (concentration of 15%) and mix for 10s, add 0.1kg of calcium stearate and mix for 15s, blow in cold air for the second time for 30s, Sand is produced to obtain a finished product.
Example Embodiment
[0020] Embodiment two:
[0021] The difference between this embodiment and the first embodiment is that the anti-mucosal liquid added in this embodiment is a paraffin-kerosene solution with a mass of 0.3 kg, while the mass of the added flake graphite powder is 0.25 kg.
[0022] The production steps of the present invention are as follows: heat 100kg of raw sand to 150-160°C, put it into the sand mixer that has started, add 0.3kg of paraffin-kerosene solution, mix for 10s, add 0.25kg of flake graphite powder and mix for 10s, add 2.0 kg novolak resin, mix for 40s and blow in cold air for 15s, then add 2kg of hexamethylenetetramine solution (concentration of 15%) and mix for 10s, add 0.1kg of calcium stearate and mix for 15s, blow in cold air for the second time for 30s , The finished product is made from sand.
Example Embodiment
[0023] Embodiment three:
[0024] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that: in this embodiment, the added anti-mucosal liquid is a coal tar-kerosene solution with a mass of 0.2 kg, and the mass of the added flake graphite powder is 0.15kg.
[0025] The production process of the present invention is as follows: heat 100kg of raw sand to 150-160°C, put it into the activated sand mixer, add 0.2kg of coal tar-kerosene solution, mix for 10s, add 0.15kg of flake graphite powder and mix for 10s, add 2.0kg of phenolic resin, mixed for 40s and then blow in cold air for 15s, then add 2kg of hexamethylenetetramine solution (concentration of 15%), mix for 10s, add 0.1kg of calcium stearate, mix for 15s, blow in cold air for the second time for 30s , The finished product is made from sand.
[0026] In order to better illustrate the technical effects that can be achieved by the present invention, the following comparative example is used for comparison.
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