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1.发明授权Suspension polymerization of polyurethanes and spin-molding the powder product thereof 失效聚氨酯的悬浮聚合，并对其粉末产物进行旋转成型
公开(公告)号：US4107256A
公开(公告)日：1978-08-15
申请号：US788214
申请日：1977-04-18
IPC分类号： C08G18/00 , B29C41/00 , B29C41/04 , C08G18/08 , C08G18/72 , B29C5/04 , C08G18/82 , C08G18/83 , C08G18/86
CPC分类号： C08G18/0871 , B29C41/003 , B29C41/04 , B29K2075/00 , B29K2105/251
摘要： Polyurethanes having a fine particle size are prepared according to a suspension process wherein silicone surfactants are utilized and the polymerization is carried out under agitation in a nonaqueous and a nonsolvent system according to either a two step, or preferably a one step process. The produced suspension-type polyurethanes are generally powders or very small granules and, therefore, can be utilized directly for rotational or spin molding processes wherein they are cured through the use of specific curing agents. Additionally, generally any suspension polyurethanes having a plasticity value of at least 2,000 square mm. at 150.degree. C, can be cured in a rotational or spin molding operation utilizing specific curing agents and curing at a temperature below the decomposition temperature of the polyurethane, for example, below 250.degree. C.
摘要翻译： 根据悬浮法制备具有细粒度的聚氨酯，其中使用硅氧烷表面活性剂，并且根据两步或优选一步法在非水和非溶剂体系中搅拌下进行聚合。 生产的悬浮型聚氨酯通常是粉末或非常小的颗粒，因此可以直接用于旋转或旋转模塑方法，其中它们通过使用特定的固化剂固化。 另外，通常具有塑性值为至少2000平方毫米的任何悬浮聚氨酯。 在150℃下，可以使用特定的固化剂在旋转或旋转成型操作中固化，并在低于聚氨酯的分解温度的温度下固化，例如低于250℃。
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