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    Press-curable fluoropolymer compositions and process
    2.
    发明授权
    Press-curable fluoropolymer compositions and process 失效
    可固化氟聚合物组合物和方法

    公开(公告)号：US4177223A

    公开(公告)日：1979-12-04

    申请号：US864606

    申请日：1977-12-27

    申请人： Richard J. Arhart ,  Arthur Nersasian

    发明人： Richard J. Arhart ,  Arthur Nersasian

    IPC分类号： C08L27/00 ,  B01D53/94 ,  B01J29/06 ,  B01J29/44 ,  C01B3/16 ,  C08J3/24 ,  C08K3/22 ,  C08K5/04 ,  C08K13/02 ,  C08L1/00 ,  C08L27/12 ,  C08L27/14 ,  F01N3/08 ,  F23G7/07 ,  C08F8/00 ,  C08F14/22

    CPC分类号： C08K13/02 ,  C08K3/22 ,  C08K5/06 ,  C08K5/13 ,  C08K5/36

    摘要： Copolymers of vinylidene fluoride with at least one other fluorinated- ethylenically unsaturated monomer are press-cured at about 163.degree.-204.degree. C. by crosslinking with an aromatic polyhydroxy compound in the presence of an accelerator in a weakly basic system, at least a portion of the polyhydroxy compound being blocked by conversion to acetal or thioacetal groups. At the press-cure temperature some of the acetal or thioacetal groups are decomposed and the free hydroxyl groups are reformed, thus providing crosslinking capability. The remainder of acetal or thioacetal groups are decomposed during post-cure oven heating at a higher temperature, and under those conditions copolymer vulcanization is completed. Press-cured compositions of this invention have excellent hot tensile elongation, which permits easy demoldability; and very good recyclability, which eliminates or reduces fluoropolymer waste. The compositions of this invention also have excellent mold flow properties at press-cure temperature.

    摘要翻译： 偏二氟乙烯与至少一种其它氟化烯属不饱和单体的共聚物在约163℃-20℃下通过在弱碱性体系中的促进剂存在下与芳族多羟基化合物交联进行加压固化，至少部分 的多羟基化合物被转化成缩醛或硫缩醛基团而被封闭。 在压固温度下，一些缩醛或硫缩醛基团被分解，游离羟基被重整，从而提供交联能力。 缩醛或硫缩醛基团的剩余部分在后期固化烘箱中在较高温度下分解，在这些条件下共聚物硫化完成。 本发明的压固组合物具有优异的热拉伸伸长率，这允许容易的脱模性; 并且具有非常好的可回收性，可消除或减少含氟聚合物的浪费。 本发明的组合物在压固温度下也具有优异的模具流动性能。