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    • 3. 发明授权
    • Molecular oriented, silane-crosslinked ultra-high-molecular-weight
polyethylene molded article and process for preparation thereof
    • 分子取向,硅烷交联的超高分子量聚乙烯模塑制品及其制备方法
    • US4870136A
    • 1989-09-26
    • US934701
    • 1986-11-25
    • Kazuo YagiHitoshi Mantoku
    • Kazuo YagiHitoshi Mantoku
    • C08F255/02C08L23/06C08L43/04D01F6/04D01F11/06
    • C08F255/02C08L23/06C08L43/04D01F11/06D01F6/04C08L2207/068C08L2312/08C08L51/06C08L91/00
    • If ultra-high-molecular-weight polyethylene having an intrinsic viscosity (.eta.) of at least 5 dl/g is grafted with a silane compound in the presence of a radical initiator and extrusion-molded and the extrudate is impregnated with a silanol condensation catalyst after or during drawing and is then exposed to water to effect crosslinking, there is obtained a novel molecularly oriented molded articles in which increase of the melting temperature, which is not observed in conventional draw-molded or crosslinked molded articles of polyethylene, can be attained, and even if this molecularly oriented molded article is exposed to a temperature of 180.degree. C. for 10 minutes, the molded article is not fused but the shape is retained and even after this heat history, a high strength retention ratio can be maintained. In this draw-molded article, the adhesiveness and creep resistance are prominently improved while high elastic modulus and high tensile strength inherent to a draw-molded article of ultra-high-molecular-weight polyethylene are retained.
    • 如果特性粘度(η)至少为5dl / g的超高分子量聚乙烯在自由基引发剂的存在下用硅烷化合物接枝并挤出成型,挤出物用硅烷醇缩合催化剂 在拉伸之后或之后,然后暴露于水以进行交联,得到新的分子取向模制品,其中可以获得在常规的拉伸模制或交联的聚乙烯模制品中未观察到的熔融温度的升高 即使将该分子取向成型体在180℃的温度下暴露10分钟,也不会熔融成型制品,但是保持其形状,即使在该热历史之后,也能够保持高强度保持率。 在该拉伸成型品中,保持了超高分子量聚乙烯的拉伸成形品固有的高弹性模量和高拉伸强度,显着提高了粘合性和抗蠕变性。