Elastomers and Composites
- Volume 35 Issue 3
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- Pages.205-214
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- 2000
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- 2092-9676(pISSN)
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- 2288-7725(eISSN)
A study on the Synthesis end Properties of Polyurethane Resin Based on PPG as a Glycol
폴리프로필렌글리콜을 글리콜 성분으로 하는 폴리우레탄 수지의 합성 및 물성에 관한 연구
- Yoo, Kil-Sang (Defense Quality Assurance Agency) ;
- Choi, Sang-Goo (Dept. of Chemical Tech., Ho-Won University)
- Published : 2000.09.30
Abstract
The polyurethane resin was prepared by the reaction of tolylenediisocyanate(TDI) and polypropyleneglycol(PPG). Physical properties of the resin were investigated experimentally. Charging catalyst before TDI-dropping induced the rapid increase of viscosity. On the other hand, charging catalyst after TDI-dropping resulted in mild stability without immoderate generation of heat on reaction. The use of phosphoric acid as catalyst led to low viscosity by restraining side-reaction such as forming of branch-chain, buret reaction and allopanate reaction, but it showed low cross-link density and slow drying. The curing speed was more influenced by structures of molecules rather than NCO/OH ratio. Including PPG 400 over 30 wt % showed excellent adhesive strength due to increase of crosslink density.
TDI에 PPG 3000을 기재로 사용하고 PPG 400, PPG 1000, PPG 2000을