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    • 9. 发明授权
    • Method of preparing thermoplastic foams using a gaseous blowing agent
    • 使用气体发泡剂制备热塑性泡沫的方法
    • US5707573A
    • 1998-01-13
    • US552473
    • 1995-11-09
    • Joseph A. BiesenbergerSubir K. DeyDavid B. Todd
    • Joseph A. BiesenbergerSubir K. DeyDavid B. Todd
    • B29C44/34C08J9/12B29C44/20
    • C08J9/122B29C44/3446B29C44/348Y10S264/05
    • Thermoplastic foams are provided by a process in which a gaseous blowing agent of nitrogen, air, carbon dioxide, argon or mixtures thereof is injected into a melted thermoplastic polymer and the pressure is used to form a solution of the blowing agent and the melted polymer. The solution is cooled to a temperature which is within 10.degree. C. of the polymer freezing point while the pressure is held to a point within which both of the following conditions exist: A) the pressure must be high enough to keep the gas blowing agent in the solution with the melt, and B) the pressure must be low enough to avoid adding more heat to the solution. Just before the cooled solution is extruded, it is important to have the solution at a temperature which is sufficiently uniform to make: A) the thermoplastic foam at least about 65% by volume in closed cells, and B) a substantially uniform cell size in the product. The cooled solution is then extruded out of an extruder die to where the pressure drop across the die is in the range of from about 70 to about 90% of the pressure in the extruder so that a cellular product is formed.
    • 通过将氮气,空气,二氧化碳,氩气或其混合物的气体发泡剂注入熔融的热塑性聚合物并且使用压力来形成发泡剂和熔融聚合物的溶液的方法提供热塑性泡沫。 将溶液冷却至聚合物凝固点的10℃以内的温度,同时将压力保持在存在以下两个条件的点:A)压力必须足够高以保持气体发泡剂 在熔体溶液中,B)压力必须足够低以避免向溶液中加入更多的热量。 在冷却的溶液挤出之前,重要的是使溶液的温度足够均匀,使得:A)热塑性泡沫体在闭孔中的体积至少约为65体积%,B)基本均匀的泡孔尺寸 该产品。 然后将冷却的溶液从挤出机模具中挤出出来,其中模具上的压降在挤出机中的压力的​​约70至约90%的范围内,从而形成细胞产物。