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    • 9. 发明申请
    • FOUNDRY RESINS
    • 基础树脂
    • WO1995034392A1
    • 1995-12-21
    • PCT/US1995006880
    • 1995-06-06
    • KURPLE, Kenneth, R.
    • B22C01/22
    • B22C1/2293B22C1/02B22C1/2273C08G18/4081C08G18/6492
    • A process for making foundry cores and molds is disclosed as well as the core and molds which are produced as well as a sand binder. The binder is a resin which includes a lignin dissolved in a suitable solvent reacted and/or cured with an isocyanate material. The lignin used contains no more than 2 % sodium ions. A polyether polyol may be added which has a functionality of greater than 3 and preferably at least 6. A tin catalyst is disclosed for use in the system which has a valence of +4 and one soluble in the system. A material is added to the system to give the mold or core a resistance to the water in core and mold washes. Suitable materials are propylene oxide derivatives of bis phenol A.
    • 公开了制造铸造芯和模具的方法以及生产的芯和模具以及砂粘合剂。 粘合剂是一种树脂,其包括溶解在与异氰酸酯材料反应和/或固化的合适溶剂中的木质素。 使用的木质素含有不超过2%的钠离子。 可以加入具有大于3,优选至少为6的官能度的聚醚多元醇。公开了用于体系中的价态为+4和一种可溶于体系的锡催化剂。 将一种材料加入到系统中以使模具或芯体具有耐芯性和模具清洗性的耐水性。 合适的材料是双酚A的环氧丙烷衍生物。