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    • 86. 发明授权
    • Method of preparing resin coated foundry sand using unsaturated polyester
    • 使用不饱和聚酯制备树脂涂层铸造砂的方法
    • US4396571A
    • 1983-08-02
    • US329507
    • 1981-12-10
    • Akira OyamadaKoue OhkawaKazumi TanakaIsao Suyama
    • Akira OyamadaKoue OhkawaKazumi TanakaIsao Suyama
    • B22C1/22C08F283/01C08F299/00C08F299/04C08K9/08C08L67/06
    • B22C1/2266C08K3/34C08K9/08Y10T428/2998
    • In preparing a resin coated sand for use in sand mold casting processes by a hot-melt process using an unsaturated polyester which is solid at room temperature as the coating material, a solution of an organic peroxide as a polymerization initiator for the unsaturated polyester is introduced into the mixture of heated foundary sand and the unsaturated polyester while the polyester is in the state of liquid coating on the sand particles, and stirring is continued to uniformly mix the solution with the unsaturated polyester and evaporate and dissipate the solvent before solidification of the polyester coating as the result of cooling of the mixture. The polyester coating contains no liquid cross-linking agent, so that the resin coated sand is untacky and high in fluidity at room temperature and, therefore, can be filled into a die cavity to shape a sand mold or core with sufficiently high bulk density.
    • 在通过使用在室温下为固体的不饱和聚酯作为涂层材料的热熔方法制备用于砂模铸造工艺中的树脂涂布砂时,引入作为不饱和聚酯的聚合引发剂的有机过氧化物溶液 进入加热的砂和不饱和聚酯的混合物,同时聚酯处于砂粒上的液体涂覆状态,继续搅拌以使该溶液与不饱和聚酯均匀混合,并在聚酯固化之前蒸发并消散溶剂 作为混合物冷却的结果。 聚酯涂层不含液体交联剂,使得树脂涂布的砂在室温下是非粘性的且流动性高,因此可以填充到模腔中以形成具有足够高堆积密度的砂模或芯。