Novel heat-hardenable binders phenol-formaldehyde+HMT+acid
    2.
    发明授权
    Novel heat-hardenable binders phenol-formaldehyde+HMT+acid 失效
    新型热硬化粘合剂酚醛+ HMT +酸

    公开(公告)号:US4942217A

    公开(公告)日:1990-07-17

    申请号:US263066

    申请日:1988-10-26

    CPC分类号: C08G8/10 B22C1/2253

    摘要: A heat-hardenable binder comprising (a) a phenolic resin of a phenolic compound and formaldehyde in a molar ratio of 1:1 to 1:2 and (b) an effective amount of a hardener mixture of hexamethylenetetramine and an acidic latent hardening agent with reduced emission problems and curing rapidly.

    摘要翻译: 一种热可硬化粘合剂,其包含(a)酚类化合物的酚醛树脂和摩尔比为1:1至1:2的甲醛和(b)有效量的六亚甲基四胺和酸性潜硬化剂的固化剂混合物与 减少排放问题,迅速治愈。

    Novel molding materials
    3.
    发明授权
    Novel molding materials 失效
    新型成型材料

    公开(公告)号:US5043365A

    公开(公告)日:1991-08-27

    申请号:US407232

    申请日:1989-09-14

    IPC分类号: B22C1/00 C08G18/18 C08G18/54

    CPC分类号: B22C1/00 C08G18/542

    摘要: A granular molding material with a binder comprising a phenol novolac and a polyisocyanate which hardens upon addition of amine catalysts wherein the molar ratio of phenol to formaldehyde in the novolac is 1:0.25 to 1:0.5 and has the formula ##STR1## wherein R, R' and R" are individually selected from the group consisting of hydrogen, alkyl of 1 to 12 carbon atoms, hydroxy, cycloalkyl of 3 to 12 carbon atoms and an anellated ring and X is an integer from 0 to 4 or >4 with the percent molar distribution based on X is as follows:______________________________________ when X = 0: 20-55% X = 1: 15-30% X = 2: 10-30% X = 3: 0-50% X .gtoreq. 4: 0-2.5% ______________________________________ for the production of improved foundry cores and molds.

    摘要翻译: 一种具有粘合剂的粒状模制材料,其包含苯酚酚醛清漆和多异氰酸酯,其在加入胺催化剂时硬化,其中酚醛与酚醛清漆之间的摩尔比为1:0.25至1:0.5,并具有式“ R'和R“分别选自氢,1至12个碳原子的烷基,羟基,3至12个碳原子的环烷基和一个安定的环,X是0-4或> 4的整数, 基于X的摩尔分数百分比如下:当X = 0:20-55%-X = 1:15-30%-X = 2:10-30%-X = 3:0-50%-X > / = 4:0-2.5% - 用于生产改进的铸造芯和模具。