THIEC改性三聚氰胺甲醛树脂泡沫的制备及其性能表征

Preparation and Performance Characterization of Tripolycyanamide Formaldehyde Resin Foam Modified by THIEC

首先,采用三-(2-羟乙基)异氰酸脲酯(THIEC)作为增韧剂对三聚氰胺甲醛树脂(蜜胺树脂)进行化学改性,以提高树脂的韧性。然后,将改性蜜胺树脂与表面活性剂、发泡剂、固化剂、成核剂等充分混合搅拌,采用普通热发泡法制得三聚氰胺甲醛树脂泡沫(蜜胺泡沫)。用扫描电子显微镜(SEM)、氧指数仪、万能电子试验机、导热系数仪对蜜胺泡沫的形态结构、阻燃性能、力学性能及热绝缘性能进行了测试和分析。探究了发泡剂、固化剂用量对蜜胺泡沫表观密度及形态的影响。结果表明:当THIEC、发泡剂、固化剂、成核剂的用量依次为蜜胺树脂质量的15%、10%、6%、2%,发泡温度为80℃时,蜜胺泡沫的压缩强度达到150kPa、极限氧指数为34、导热系数为0.027W/(m·K),综合性能良好。

Firstly,1,3,5-tris（2-hydroxyethyl） isocyanurate（THIEC） as a toughening agent was introduced into the structure of tripolycyanamide formaldehyde resin （melamine resin） for chemical modification to improve the toughness of resin.Then,modified melamine resin was fully mixed and stirred with the surfactant,foaming agent,curing agent,nucleating agent and so forth,followed by foaming the mixed solution using the ordinary heating method to produce tripolycyanamide formaldehyde resin foam （melamine foam）.The morphological structure,flame retardation,mechanical property,and thermal insulation of melamine foam were examined and analyzed by Scanning Electron Microscope （SEM）,oxygen index testing apparatus,universal material testing machine,thermal conductivity measuring instrument,respectively.Effects of the amounts of foaming agent,curing agent on the apparent density and morphology of melamine foam were studied.Results showed that melamine foam compression strength reached 150 kPa,limited oxygen index was 34,thermal conductivity coefficient was 0.027 W/（m·K）,when THIEC、foaming agent、curing agent、nucleating agent dosage followed by melamine resin quality of 15%、10%、6% and 2%,and the foaming temperature was 80℃.