Elastomers and Composites
- 제35권3호
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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)
폴리프로필렌글리콜을 글리콜 성분으로 하는 폴리우레탄 수지의 합성 및 물성에 관한 연구
A study on the Synthesis end Properties of Polyurethane Resin Based on PPG as a Glycol
- Yoo, Kil-Sang (Defense Quality Assurance Agency) ;
- Choi, Sang-Goo (Dept. of Chemical Tech., Ho-Won University)
- 발행 : 2000.09.30
초록
TDI에 PPG 3000을 기재로 사용하고 PPG 400, PPG 1000, PPG 2000을
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.