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以多亚甲基多苯基异氰酸酯(PM-200)、聚醚多元醇(5110)为主要原料,以硅油(L580)为稳泡剂,水(H2O)为发泡剂,采用一步发泡法制备一系列不同密度硬质聚氨酯泡沫材料,通过水压穿孔工艺实现硬质聚氨酯泡沫开孔,制备具有形如迷宫样的相互贯通的开孔硬质聚氨酯泡沫。研究了泡沫密度和开孔压力对泡沫开孔率和压缩强度的影响,以及开孔率对吸声系数的影响。结果表明:开孔压力越大,相应的开孔率越大;在开孔压力相同的情况下,泡沫的密度越小,开孔率越大;开孔率越大,材料吸声系数越大;开孔压力的变化对泡沫压缩强度影响不大。
Polystyrene polyisocyanate (PM-200) and polyether polyol (5110) were used as main raw materials, silicone oil (L580) as foam stabilizer and water as foaming agent A series of rigid polyurethane foams of different densities were prepared. The rigid polyurethane foams were perforated by a hydraulic perforation process to prepare an open-celled rigid polyurethane foam in the shape of a labyrinth. The effects of foam density and open pressure on the foam open porosity and compressive strength, and the influence of open area ratio on the sound absorption coefficient were investigated. The results show that the larger the opening pressure is, the larger the opening ratio is. When the opening pressure is the same, the smaller the foam density is, the larger the opening ratio is. The larger the opening ratio is, the larger the sound absorption coefficient ; The change of pore pressure has little effect on the compressive strength of foam.