【摘要】 以聚醚多元醇、二苯基甲烷二异氰酸酯(MDI-50)、苯酚、2,2’-二氯-3,3’-二甲基-4,4’-二氨基二苯基甲烷等为主要原料合成了单组分热固化聚氨酯弹性涂料,考察了封端过程中温度、时间、催化剂质量分数对封端反应的影响,利用差示扫描量热法研究了涂料的解封温度,红外光谱法对封端结果进行表征,对所得涂膜各项性能进行了测试。结果表明,封端过程中反应温度为80℃,反应时间为6 h,催化剂质量分数为0.35%时,封端效果较为理想,封端率达90%左右,封端反应较为完全,预聚体解封温度从120℃开始,约180℃完全解封,所得涂膜各项性能优异,是一种具有良好性能的单组份热固化涂料。更多还原

【Abstract】 A series of one component heat-cured polyurethane coatings are synthesized with polyether polyols,methylene diphenyl diisocyanate,phenol and 2,2’-dichlloro-3,3’-dimethyl-4,4’-diaminodiphenyl-methane as raw materials. The effect of blocking temperature,blocking reaction time and dosage of catalyst on the blocking reaction is investigated. The unblocking temperature is studied with DSC. The properties of coating are also tested. The structure of terminated prepolymer is characterized by FT-IR. The results show that the blocking rate can reach 90% under the following conditions: 80℃ of blocking temperature,6 h of blocking time and 0. 35% mass fraction of catalyst. The deblocking temperature is from 120℃ to 180℃. All the properties of the film is excellent,indicating that MDI-50 type polyurethane is a good one-component heat-cured coating.更多还原