文献类型：期刊文献

中文题名：苯酚封端蓖麻油基聚氨酯预聚物对苯酚-间苯二酚-甲醛泡沫性能的影响

英文题名：Effects of castor oil-based polyurethane prepolymer on the properties of phenol-resorcinol-formaldehyde foams

作者：刘娟[1] 郭腾飞[1] 陈日清[1] 王春鹏[1] 储富祥[2]

机构：[1]国家林业局林产化学工程重点开放性实验室,中国林业科学研究院林产化学工业研究所,南京210042;[2]中国林业科学研究院,北京100091

年份：2017

卷号：2

期号：3

起止页码：97-102

中文期刊名：林业工程学报

外文期刊名：Journal of Forestry Engineering

收录：CSTPCD;;北大核心:【北大核心2014】；

基金：中央级公益性科研院所基本科研业务费专项资金(CAFYBB2016ZX002)

语种：中文

中文关键词：蓖麻油基聚氨酯预聚物;苯酚-间苯二酚-甲醛树脂泡沫;力学性能;热稳定性;微观结构;阻燃性能

外文关键词：castor oil-based polyurethane prepolymer; phenol-resorcinol-formaldehyde foam; mechanical properties ; thermal stability; microstructure; flame retardant properties

分类号：TQ323

摘要：以二苯基甲烷二异氰酸酯(MDI)、蓖麻油及苯酚为原料合成了苯酚封端的蓖麻油基聚氨酯预聚物(CPUP),以该预聚物作为增韧剂改性苯酚-间苯二酚-甲醛树脂制备泡沫材料。采用FTIR和1 H NMR对CPUP结构进行了表征,用丙酮-二正丁胺法测试了CPUP制备过程中异氰酸根(—NCO)含量的变化;同时研究了CPUP添加量对泡沫力学性能、热稳定性能、阻燃性能以及泡沫微观形态的影响。结果表明,反应3.0h时,蓖麻油基聚氨酯预聚物的—NCO含量达到理论值5.85%,用苯酚封端3.0h后,—NCO值接近0;当增韧剂质量分数为5%时,泡沫的力学性能最好,其中压缩强度和弯曲强度分别为186.2和329.7kPa,比未改性的泡沫提高了26.7%和45.4%,掉渣率为17.2%,比纯泡沫降低了18.5%;改性泡沫的热稳定性能略有提高,阻燃性能优良,氧指数为35.8%;泡沫壁与壁之间结合紧密,分布均匀。
As a traditional commercial synthetic polymer, phenolic foams have been widely used in construction, horticulture and other infrastructure applications due to its excellent physical and chemical properties such as flame resistance, thermal stability, low smoke emission. However, pure phenolic foams were brittle, which severely limited the popularization and application of phenolic foams. In this study, castor oil-based polyurethane prepolymer （CPUP） was synthesized by reacting diphenyl methane diisocyanate （MDI） with castor oil and phenol, where phenol was used as a blocking agent. And the resulting CPUP was used to improve the tougheness of phenolic foam. The structure of CPUP was characterized by FTIR and I H NMR, and the content of isocyanate group was tested by acetone-dibutyl- amine method. Meanwhile, the mechanical properties, thermal stability, flame retardant and microstructure of the phenolic foams were determined with universal material testing machine, thermogravimetric analysis, oxygen index tester and scanning electron microscopy, respectively. The results showed that when castor oil and diphenyl methane diisocyanate reacted for 3.0 h, the content of isocyanate group of prepolymer reached the theoretical value of 5.85%, and isocyanate content decreased to 0. 02% when the synthetic prepolymer continued to react with phenol for 3.0 h. The phenolic foam modified with 5% CPUP had the best performance：the compression strength and flexural strength were 186. 2 kPa and 329. 7 kPa, respectively, which increased by 26. 7% and 45.4% compared with those of pure phenolic foam; the fragility of modified foam was 17. 2% and decreased by 18.5%; the thermal stability was better than that of pure foam as well. The limit oxygen index of modified foam was 35.8%, indicating a good flame retardant property of the foam. In addition, the foam cell walls were closely combined and evenly distributed.