The present invention relates to a method for producing an extruded styrene resin foam comprising the steps of heating and melting a styrene resin, adding a blowing agent to the styrene resin, and extrusion-foaming the resultant into a lower pressure region through a die, wherein the blowing agent comprises 1) 2 to 6 parts by weight of one or more saturated hydrocarbons selected from the group consisting of saturated hydrocarbons having 3 to 4 carbon atoms, 2) 1 to 6 parts by weight of at least one ether selected from the group consisting of dimethyl ether, methyl ethyl ether and diethyl ether, and 3) 0 to 3 parts by weight of at least one member selected from the group consisting of water and alcohols having 1 to 4 carbon atoms, based on 100 parts by weight of the styrene resin, and wherein the pressure drop in a die slit portion is not less than 4MPa and the resin residence time in the die slit portion is not more than 0.4 seconds.
本发明涉及一种生产挤压
苯乙烯树脂泡沫塑料的方法,该方法包括以下步骤:加热和熔化
苯乙烯树脂,向
苯乙烯树脂中加入发泡剂,通过模头将发泡剂挤压至低压区,其中发泡剂包括:1)2至6份(重量)选自具有3至4个碳原子的饱和碳氢化合物组的一种或多种饱和碳氢化合物、2) 1 至 6 份(按重量计)至少一种选自二
甲醚、
甲乙醚和二
乙醚组成的组的醚,和 3) 0 至 3 份(按重量计)至少一种选自
水和具有 1 至 4 个碳原子的醇组成的组的成员,以 100 份(按重量计)
苯乙烯树脂为基准,其中在模头狭缝部分的压降不小于 4MPa,
树脂在模头狭缝部分的停留时间不超过 0.4 秒。