没食子酸改性氢化萜烯基环氧树脂多元醇的合成及性能研究

利用天然可再生资源没食子酸(GA)与氢化萜烯基环氧树脂(HTME)在一定条件下反应制备了环氧树脂基多元醇(HTME - GA多元醇).通过研究合成反应的影响因素,确定了HTME - GA多元醇的合成反应条件:以GA物质的量12.5倍的正丙醇为反应溶剂,以占HTME与GA总质量2%的季铵盐为催化剂,HTME与GA共沸回流反应3h.经FT - IR、NMR光谱表征了HTME - GA多元醇的化学结构,比较了该多元醇与聚己二异氰酸酯HN90T、改性聚己二异氰酸酯EC385的交联反应特性及交联产物性能.实验结果表明,HTME - GA多元醇与EC385的交联产物具有优良的机械力学性能,与HN90T的交联产物具有较好的耐液体介质性能和硬度,但后者柔韧性较差.随着NCO与OH物质的量比的增大,交联产物的硬度和耐液体介质性能提高.

Synthesis and Properties of Polyol from Hydrogenated Terpinene-maleic Ester Type Epoxy Resin Modified by Gallic Acid

A new kind of polyol(HTME-GA polyol) was synthesized from hydrogenated terpinene-maleic ester type epoxy resin(HTME) modified by gallic acid(GA),and the suitable synthesis conditions were confirmed by studying the factors of synthesis reaction.HTME-GA polyol could be obtained by reacting GA with HTME at reflux temperature for about 3 hours in the solvent of n-propyl alcohol with the amount about 12.5 times of GA by molar weight and catalyst of quaternary ammonium salt with the amount about 2 % of the reactants by weight.The chemical structure of HTME-GA polyol was characterized by chemical analysis,FT-IR and 13C NMR spectral methods.HTME-GA polyol was crosslinked with two different curing agents,namely HN90T(HDI trimer) and EC385(HDI trimer modified with polyether).It was shown that the crosslinked product of HTME-GA polyol with EC385 had better mechanical properties,and the crosslinked product of HTME-GA polyol with HN90T had better properties of resistance against liquids and higher hardness,while with poor flexibility.The increase of molar ratio of NCO/OH resulted in higher hardness and better liquid resistance of crosslinked product.