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    • 9. 发明申请
    • Method for preparing thermoplastic vulcanizates with improved extrusion surfaces
    • 制备具有改进的挤压表面的热塑性硫化橡胶的方法
    • US20070135571A1
    • 2007-06-14
    • US11297937
    • 2005-12-09
    • Maria EllulJianya Cheng
    • Maria EllulJianya Cheng
    • C08L53/00
    • B29C47/1063B29C47/0004B29C47/0009B29C47/1045B29K2021/00B29K2101/12B29K2105/0005B29K2105/0055B29K2105/16C08F8/50
    • The invention described is a process for the preparation of dynamically vulcanized thermoplastic elastomers comprising melt processing under shearing conditions in melt reaction extruder, A) at least one thermoplastic resin, B) at least one vulcanizable gas-phase elastomer having a Mooney viscosity (ML1+4(125° C.)) of from about 65 to about 450, C) a curing agent or agents, and D) process oil, wherein said process oil D) is added to the extruder in at least three oil injection positions located a) at least one location before or within the first 15% of the total length of the extruder; b) at least one other location prior to, at or within 10% total extruder length after the onset of the vulcanization of said gas-phase elastomer; and c) at least one location subsequent to the location of the point at which the vulcanization of said gas-phase elastomer is substantially completed; wherein the direct oil injection locations into the extruder are positioned at or immediately before one or more distributive mixing elements, which distributive mixing elements are immediately followed by one or more dispersive mixing elements. Thermoplastic vulcanizates capable of being extrusion molded with a smooth surface and low surface spot count, in addition to excellent elastomeric properties, are obtained through the use of the process described.
    • 本发明描述了制备动态硫化热塑性弹性体的方法,该方法包括在熔融反应挤出机中的剪切条件下的熔融加工,A)至少一种热塑性树脂,B)至少一种门尼粘度(ML)的可硫化气相弹性体, 约1至4℃(125℃))为约65至约450℃,C)固化剂或试剂,和D)加工油,其中将所述加工油D)加入到挤出机中 至少三个注油位置位于a)在挤出机的总长度的前15%之前或之内的至少一个位置; b)在所述气相弹性体硫化开始之前,期间或之内的10%总挤出机长度处的至少另一个位置; 和c)在所述气相弹性体的硫化基本上完成的点的位置之后的至少一个位置; 其中进入挤出机的直接注油位置位于或紧邻一个或多个分配混合元件之前,分配混合元件紧随着一个或多个分散混合元件。 通过使用所述方法,可以获得能够通过光滑表面挤出成型并具有低表面斑点数的热塑性硫化橡胶,以及优异的弹性体性质。