폴리우레탄 접착제의 제조 및 물성에 관한 연구

Abstract

Now a day polymers such as ABS, PP and etc in automobile indoor materials applied because of needs of this time such as reducing weigh and cost reduction. So use of the adhesive for bonding system is gradually spreading but we have to solve environmental problems such as VOC reduction and BTX free. This paper was provided about polyurethane adhesives composed of diisocyanate and polyol having about 2000 molecular weight that can be flexible and soft. Polyester polyol used in this paper has more excellent properties such as heat resistance and adhesion force except for the hydrolysis than polyether polyol. Current BTX free adhesive products have some difficulties to automobile application because of less adhesion properties. Solvents of polyurethane adhesives in this paper is AC, MEK, EtAc and the rates used as 20wt%, 30wt% and 20wt% respectively. So these adhesives are toluene free type having low VOCs. Polyester polyols used polytetramethyl adipate(PTMA) and polyhexametyl adipate(PHMA) having 2000 molecular weight. The ratios of PTMA/PHMA are 100/0, 80/20, 72/28, 60/40, 52/48, 40/60 respectively. Aging time, adhesion properties, heat resistance, GC for defining solvents, GPC for defining molecular weight of adhesives, and mechanical properties are studied. In this study the adhesion properties is high as increasing PHMA proportion and especially T-5 adhesive with PTMA(52)/PHMA(48) have a good property by all accounts.