催化剂对废旧PU硬泡回收再利用的影响  

Effect of Two⁃Component Small Molecule Alcoholysis Agent on Recycling and Reuse of Waste PU Foam

作　　者：顾晓华[1] 吕士伟 罗鸿翔 李燕 GU Xiaohua;LYU Shiwei;LUO Hongxiang;LI Yan(Qiqihar University,Qiqihar 161006,China)

机构地区：[1]齐齐哈尔大学,黑龙江齐齐哈尔161006

出　　处：《中国塑料》2020年第10期69-74,共6页China Plastics

基　　金：黑龙江省省属本科高校基本科研业务费面上项目(135409301)。

摘　　要：用含有小分子醇的交联剂和催化剂使废旧聚氨酯(PU)硬泡进行降解能够获得多元醇,将降解料与聚醚多元醇、催化剂和发泡剂共混以制备白料,然后与黑料异氰酸酯混合均匀,得到再生PU硬泡。通过对降解产物的黏度、羟值以及获得的再生PU硬泡材料的密度、强度、吸水率、热稳定性、扫描电子显微镜、红外光谱和热失重等进行测试分析,得出了催化剂添加量对废旧PU材料回收再利用的影响因素。结果表明,催化剂(KOH)用量为0.9 g时废旧PU的降解效果最好,获得的再生PU硬泡的密度为37.6 kg/cm^3,压缩强度为164.2 kPa,热导率为0.01524 W/(m·K),吸水率为0.4295%。Polyols were obtained by degrading waste PU rigid foams with cross-linking agents and catalysts containing small-molecular alcohols.The resultant degradable materials were blended with polyether polyols,catalysts and blowing agents to prepare white materials and then mixed with black isocyanates to get the regenerated PU hard foam.The regenerated PU rigid foam was analyzed in terms of the viscosity,hydroxyl value,density,strength,water absorption,thermal stability,infrared spectroscopy and scanning electron microscopy,and the effect of addition amount of catalyst on the recycling and reuse of the waste PU rigid foams was investigated.The results indicated that the waste PU rigid foams achieved the optimum degradation effect when 0.9 g of KOH catalyst was added.The density of regenerated PU hard foam was 37.6 kg/cm^3,its compressive strength was 164.2 kPa,its thermal conductivity was 0.01524 W/(m·K),and the water absorption rate was 0.4295%.

关 键 词：废旧聚氨酯硬泡 小分子醇 醇解 发泡 添加剂 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]