Binder for dry sand mold and method of its usage
First Claim
1. A method for manufacturing a sand mold for castings which comprises the steps of mixing foundry sand with an aqueous solution of a binder selected from the group consisting of a hydrolyzate of a butadiene/maleic anhydride copolymer, a neutralized or a partially neutralized substance of said hydrolyzate, a modified substance prepared by modifying said hydrolyzate with a basic organic compound, or a mixture thereof so that the amount of the binder in terms of a solid content is within the range of 0.1 to 5 parts by weight based on 100 parts by weight of said foundry sand, and molding, heating, drying and thereby curing the resultant mixture.
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Abstract
The present invention provides a binder for foundry sand which comprises a hydrolyzate of a butadiene/maleic anhydride copolymer, a neutralized or a partially neutralized substance of the hydrolyzate, a modified substance prepared by modifying the hydrolyzate with a basic organic compound, or a mixture thereof.
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Citations
4 Claims
- 1. A method for manufacturing a sand mold for castings which comprises the steps of mixing foundry sand with an aqueous solution of a binder selected from the group consisting of a hydrolyzate of a butadiene/maleic anhydride copolymer, a neutralized or a partially neutralized substance of said hydrolyzate, a modified substance prepared by modifying said hydrolyzate with a basic organic compound, or a mixture thereof so that the amount of the binder in terms of a solid content is within the range of 0.1 to 5 parts by weight based on 100 parts by weight of said foundry sand, and molding, heating, drying and thereby curing the resultant mixture.
Specification