申请人:KABUSHIKI KAISHA SERUTEKUNO
公开号:EP0214858A2
公开(公告)日:1987-03-18
This disclosure relates to a method for producing polyethylene open-cell foam materials, comprising a process step of pressurized heating at a temperature of 110 to 135°C of a base compound consisting of polyethylene or a copolymer of polyethylene which has been compounded with an azodicarbonamide foaming agent and a bridging agent, in order to obtain a primary intermediate product with a cubical expansion coefficient of 1.0 to 2.0 times; a process step of heating the primary intermediate product under normal atmospheric pressure at a temperature of 150∼190°C and thus causing the complete decomposition of the foaming agent in order to obtain a secondary intermediate product having cell membranes capable of being easily ruptured by mechanical compression, and a process step of subjecting said secondary intermediate product to mechanical pressure in order to rupture and interconnect the closed cells; and, as needed, a foaming assist agent, or a high-melting-point resin powder, or both a high-melting-point resin powder and a foaming assist agent are added to and compounded with the base compound so that the resulting products are high-expansive or ultra-high-expansive materials with an expansion ratio of 25 times said base compound, or more, and have an open-cell ratio of 96-100%.
本公开涉及一种生产聚乙烯开孔泡沫材料的方法,包括以下工艺步骤:在 110 ∼ 135°C 的温度下加压加热由聚乙烯或聚乙烯共聚物组成的基础化合物,该基础化合物已与偶氮二甲酰胺发泡剂和架桥剂复合,以获得立方膨胀系数为 1.0 ∼ 2.0 倍的初级中间产品;在正常大气压下在 150 ∼ 190°C 的温度下加热初级中间产品,从而使发泡剂完全分解,以获得二级中间产品。在正常大气压力下,在 150∼190°C 的温度下加热初级中间产品,从而使发泡剂完全分解,以获得具有可通过机械压缩轻松破裂的细胞膜的次级中间产品,以及将所述次级中间产品置于机械压力下以使闭合细胞破裂并相互连接的工艺步骤;根据需要,向基础化合物中添加发泡辅助剂或高熔点树脂粉末,或同时添加高熔点树脂粉末和发泡辅助剂,并与基础化合物复合,使所得产品成为高膨胀或超高膨胀材料,其膨胀比为所述基础化合物的 25 倍或以上,开孔率为 96-100%。