异氰酸酯/可发性酚醛树脂泡沫体的制备  

Preparation of foam from isocyanate and foaming phenolic resin

作　　者：文振广 许亮 程珏[1] 

机构地区：[1]北京化工大学碳纤维及功能高分子教育部重点实验室,北京化工大学材料科学与工程学院,北京100029

出　　处：《热固性树脂》2010年第6期1-5,32,共6页Thermosetting Resin

基　　金：国家863计划(2007AA03Z559)

摘　　要：采用端异氰酸酯聚醚预聚物与可发性酚醛树脂制备了新型泡沫体。通过ESI-MS光谱分析和泡沫物理力学性能测试研究了异氰酸酯基团与可发性酚醛树脂比例、异氰酸酯基团和三聚体相对含量、可发性酚醛树脂分子质量对泡沫体制备及性能的影响。结果表明:异氰酸酯基团与酚醛树脂质量比为40/100、三聚体质量分数<17.33%、酚醛树脂聚合时间>45min时,泡沫体的体积稳定性好,收缩率低;可发性酚醛树脂分子质量增加时,泡沫体的密度从60.16kg/m3增加到63.96kg/m3,基本保持稳定;其弯曲强度为0.2MPa,弯曲应变达到15%以上,远高于纯酚醛泡沫(6%)。在150℃下烘烤2h,泡沫体的质量损失为6%左右,体积变化为-5%左右。泡沫体的热稳定性优于聚氨酯泡沫,同时又有良好的韧性。A novel foam was prepared from isocyanate-terminated polyurethane prepolymer and foaming phenolic resin. The effect of ratio of isocyanate groups and phenolic resin,relative content of of —NCO groups and trimer,and molecular weight of foaming phenolic resin on the preparation and property of the foam were investigated by ESI-MS analysis,phisical and mechanical property tests. The results showed that the foam had good volume stability and low shrinkage at the conditions as followed：mass ratio of —NCO groups and expandable PF resin 40 /100,content of trimer 17. 33% and polymerization time of foaming phenolic resin 45min. With the molecular weight of the foaming phenolic resin increasing,the density of the foam was increased from 60. 16 kg/m3 to 63. 96 kg/m3and remained stable. The bending strength of the foam was 0. 2 MPa and bending strain was more than 15% which was much higher than that of pure phenolic foam （ 6% ） ; The mass lose of the foam was about 6% and the volume changes was about -5% when the foam was heated at 150 ℃ for 2 h. The thermal stability of foam was better than that of polyurethane foam and had good toughness.

关 键 词：异氰酸酯 可发性酚醛树脂 泡沫体 制备 弯曲应变 耐热性 

分 类 号：TQ323.1[化学工程—合成树脂塑料工业]