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| | Furfuryl alcohol resin produced by our nation-wide people's communes is recognized as one of the cheapest heat-resisting and non-corrosive polymers available at present. The use of the resin for sand-bonding and glueing foundry shells together was first developed in China. Both liquid and powdered resins were tested in this experiment. Their bonding efficiency is evaluated by means of strength tests on 8-shaped standard specimens. The resin as an adhesive is applied to the shell joint in paste form and made... | | 糠醇树脂是我国广大人民公社能生产的耐热、抗蚀、价廉的聚合物,利用它於铸造生产中首 创於我国。本试验中研究了液态与固态的两种树脂,用8字试样测其强度;而树脂作为粘壳用途 是作成膏状且利用型壳余热来固化的。试验证明:由於糠醇与砂的混合物流动性较糠醇树脂的型 砂混合物流动性高,因此吹出性能也较优良。 | | 文摘来源 | | This paper deals with the dependence of the structure of Epoxy Resin upon the condition of outing process when anhydrids are used as curing agents, and from those investigations favor-able curing condilions are ascertained. Some possible form of molecular connections between the lipoxy Rcsin anil the cnting agent are also discussed. | | 本文研究了当利用酸酐类为固化剂时,环氧树脂的固化条件与分子结构的关系,从而导出适当的固化条件。同时在固化过程中,对于分子交联的可能方式也作了讨论。 | | 文摘来源 | | With 0.1-1.5% polyaluminophenylsiloxane as catalyst, the rate of curing of poly-methylphenylsiloxane resin increases. The apparent energy of activation of curing falls from 26 kcal/mole in the absence of the catalyst to 20 kcal/mole in its presence, being little affected by the amount of catalyst used. However, the apparent frequency factor of curing increases with the increase of the catalyst, being one order of magnitude higher with 0.6 % catalyst than without.There are two stages in the thermal oxidative... | | 当引入0.1—1.5%聚铝苯基硅氧烷作为聚甲基苯基硅树脂固化催化剂时,后者由甲阶向乙阶转变时的聚合速度显著地增加;聚合反应表观活化能约由无催化剂存在时的26千卡/克分子降为20千卡克分子,改变催化剂的含量对表观活化能影响很小。表观频率因子随催化剂用量增加而增加,催化剂用量为0.6%时约增加一个数量级。 热固化的聚甲基苯基硅树脂的侧基显示出不同的热氧化稳定性。在空气中增高温度时其侧基破坏分为二个阶段,即甲基比苯基先破坏。当引入聚铝苯基硅氧烷作为硅树脂 固化催化剂,可提高其甲基的起始分解温度,同时降低苯基的起始分解温度。随催化剂用量的增加,使二种侧基起始分解温度趋于一致,逐渐消失其侧基破坏的阶段性。 | | 文摘来源 | |   | | << 更多相关文摘 |
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