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US4482654A Binder coated foundry sand grains 失效
粘结剂涂层铸造砂粒

Binder coated foundry sand grains
摘要:
Foundry sand grains coated with a binder composition which comprises 100 wt. parts of methylolmelamine or alkylated methylolmelamine and 5 to 100 wt. parts of a water-soluble organic compound having a hydroxyl group. The sand grains coated with the composition are effective in a low-temperature foundry, especially for forming a core in an aluminum-alloy foundry.
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