低温表干快的聚氨酯密封胶的研制  

Development of polyurethane sealant with fast surface drying at low temperature

作　　者：招兆林 郭盟 韦欣照 江虹 Zhao Zhaolin;Guo Meng;Wei Xinzhao;Jiang Hong(Guangdong Pustar Adhesives and Sealants Co.,Ltd.,Dongguan 523646,Guangdong,China)

机构地区：[1]广东普赛达材料科技股份有限公司,广东东莞523646

出　　处：《中国胶粘剂》2025年第3期41-45,共5页China Adhesives

摘　　要：为满足生产节奏的不断加快,发展低温快干快固的单组分聚氨酯密封胶是最重要的趋势之一。本研究制备了一种低温表干快的单组分聚氨酯密封胶,讨论了增塑剂的相对分子质量、不同伯羟基含量的聚醚多元醇、两种催化剂的不同量搭配及两种预聚体的不同配比对密封胶低温表干时间及固化速度的影响。研究结果表明:(1)不同相对分子质量的增塑剂对单组分聚氨酯密封胶的固化速度有影响,相对分子质量越小,固化速度越大。考虑增塑剂的迁移性,增塑剂的相对分子质量在270~350之间较为合适。(2)聚醚多元醇的伯羟基含量越大,对单组分聚氨酯密封胶的低温表干时间及固化速度提升越大。结合伯羟基对树脂相容性的影响,选取伯羟基含量为20%的聚醚多元醇相对最优。(3)二吗啉二乙基醚(DMDEE)添加0.15%、二月桂酸二丁基锡(DBTDL)添加0.05%时,低温表干时间相对最快,固化速度也最快。(4)使用4,4'-二苯基甲烷二异氰酸酯(MDI)制备的预聚体与使用甲苯二异氰酸酯(TDI)制备的预聚体搭配使用,可以提升密封胶的表干时间及固化速度。当两者添加量分别为25%和10%时,其保证了低温表干时间较快的同时不降低固化速度。To meet the constantly accelerating production pace,the development of single-component polyurethane sealant with fast drying and fast curing at low temperature is one of the most important trends.A single-component polyurethane sealant with fast surface drying at low temperature was prepared in this paper,and the effects of the relative molecular weight of plasticizers,polyether polyols with different primary hydroxyl contents,different dosages of two catalysts,and different ratios of two prepolymers on the surface drying time and curing speed of sealant at low temperature were discussed.The research results showed that,(1)Plasticizers with different relative molecular weights had an impact on the curing rate of single-component polyurethane sealant,with smaller relative molecular weights resulting in faster curing rates.Considering the migration of plasticizers,a relative molecular weight between 270 and 350 was relatively suitable(.2)The higher the primary hydroxyl content of polyether polyols,the greater the improvement in surface drying time and curing speed of single-component polyurethane sealant at low temperature.Considering the influence of primary hydroxyl groups on resin compatibility,the polyether polyol with a primary hydroxyl content of 20%was relatively optimal(.3)When 0.15%of 2,2'-dimorpholinyldiethyl ether(DMDEE)and 0.05%of dibutyltin dilaurate(DBTDL)were added,the surface drying time at low temperature was relatively fast and the curing speed was also the fastest(.4)The combination of prepolymers prepared by using 4,4'-diphenylmethane diisocyanate(MDI)and those prepared by using toluene diisocyanate(TDI)could improve the surface drying time and curing speed of the sealant.When the addition amounts of the two were 25%and 10%respectively,it ensured fast surface drying time at low temperature without reducing the curing speed.

关 键 词：聚氨酯 密封胶 表干快 低温 

分 类 号：TQ436.6[化学工程]