改良式聚胺基甲酸乙酯研究（V）：紫外光硬化PU系統的組成對PU薄膜的影響

The Study of Some Modified Polyurethane (V): The Effects of UV Curable PU Compositions on PU Films

簡文祥(Wen-Shiang Chien) ； 陳幹男(Kan-Nan Chen)

《化學》 46卷1期 (1988/03) Pp. 1-8

https://doi.org/10.6623/chem.1988001

摘要

本報告之紫外光硬化型PU系統，係由PPG-400或1000與甲苯異氰酸酯反應，再以2-羥基乙基甲基丙烯酸酯為末端基之反應性PU寡聚合物。本系統使用有效的光起始劑（或光敏化劑），安息香醚系，二苯甲酮，烷基苯甲酼甲酸酯等在紫外光譜分別為λ_(max)248，253和255 nm。在PU系統中反應性稀釋劑TMPTA的濃度與組成（TMPTA與EHA之比例），多元醇的分子量和NCO%等這些變數均影響硬化後的PU薄膜的性質，如膠含量、硬度、抗張強度、撞擊強度伸長率、模數和熱性質等。

並列摘要

Polyether polyols-based UV curable PU systems were prepared from the reactions of polypropylene glycols (PPG-400 or 1000), with excess of toluene diisocyanates, and 2-hydroxy-ethyl-methacrylate as the terminal groups. The effective photoinitiators (or photosensitizers), benzoin alkyl ethers, benzophenone, and alkylbenzoyl formate had λ_(max) at 248, 253 and 255 nm, respectively. Some variables of this UV curable PU systems were applied: 1. concentrations and compositions of diluents (TMPTA and EHA); 2. molecular weights of polyols; 3. NCO%(concentrations of vinyl groups) . The effects of the properties of cured PU films among these variables, such as, gel contents, pencil hardness, tensile strength , impact strength, elongation, modulus, and thermal properties were investigated.