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    • 4. 发明授权
    • Moldable composition suitable for the preparation of vitreous carbon
    • 适用于制备玻璃碳的可成型组合物
    • US4624984A
    • 1986-11-25
    • US782313
    • 1985-10-01
    • Louis L. KorbPhillip A. Waitkus
    • Louis L. KorbPhillip A. Waitkus
    • C08G8/04C08G8/06C08K3/04C08L61/06C08L61/08C08L61/10C08L61/14
    • C08K3/04C08G8/04C08G8/06C08L61/06
    • The moldable composition disclosed herein comprises co-reacted mixtures of powder or otherwise blendable form of 20-80% by weight of a phenolic-furfuraldehyde Novolac resin and of 20-80% by weight of a phenolic-aldehyde resol resin in water, either in solution or suspension, the percentages being based on the combined weight of the Novolac and resol resins, and the aldehyde in said Novolac resin comprising at least 50 molar percent, preferably substantially 100 percent, furfuraldehyde. The composition contains an amine such as hexamethylenetetramine ("hexa") in an amount equivalent to 1-15%, preferably 2-10% of hexamethylenetetramine based on the total amount of phenolic component. The composition is made by adding the preformed phenol-furfuraldehyde Novolac to the resol resin prior to dehydration of the resol resin to produce a grafted polymerization product of improved properties. This composition is particularly useful in admixture with a carbonaceous filler, preferably graphite in a proportion as high as 76% by weight based on the total composition. Generally in such admixtures the graphite may comprise 30-76%, advantageously 35-65% and preferably 40-60% of the molding composition. The vitreous carbon is improved in electrical properties and in the capability of being suitably molded, carbonized and graphitized into large shapes, particularly thin places which are much more stress-free and crack or pore-free than otherwise produced.
    • 本文公开的可模塑组合物包含20-80重量%的酚醛糠醛酚醛清漆树脂和20-80重量%的酚醛树脂在水中的粉末或其它可混合形式的共反应混合物, 溶液或悬浮液,百分比基于酚醛清漆和甲阶酚醛树脂的组合重量,所述酚醛清漆树脂中的醛包含至少50摩尔%,优选基本上100%的糠醛。 该组合物含有基于酚组分总量的相当于十六烷基四胺的1-15%,优选2-10%的六亚甲基四胺(“hexa”)的胺。 通过在甲醛树脂脱水之前将预制的苯酚 - 糠醛酚醛清漆加入到甲阶酚醛树脂中以制备具有改进性能的接枝聚合产物来制备组合物。 该组合物特别可用于与碳质填料混合,优选基于总组合物高达76重量%的比例的石墨。 通常在这样的混合物中,石墨可以占模塑组合物的30-76%,有利地35-65%,优选40-60%。 玻璃碳的电性能以及适当地模塑,碳化和石墨化的大型形状,特别是较其它制造的无应力,无裂纹或无孔隙的薄部位的能力得到改善。