摘要
聚氨酯/环氧树脂亲水性能低,不适合制作涂料。以2,4-甲苯二异氰酸酯、聚乙二醇单甲醚和环氧树脂为原料,通过2步聚合法合成了亲水性能较好的聚氨酯/环氧树脂(PU/EP)接枝共混物。利用Spectrum BXⅡ红外光谱、JGW-360型接触角测定仪、TH-5000N型电子万能试验机、METTLER-TOLEOO型动态力学分析仪研究了PU/EP接枝共混物的价键结构,PU与EP的配比对其亲水性、吸水率、力学强度和损耗因子等性能的影响。结果表明:2步聚合法成功地制备了PU/EP接枝共混物;随着PU含量的提高,PU/EP接枝共混物的亲水性、吸水率和拉伸强度都有所提升,剪切强度有一定程度的下降,玻璃化转变温度逐渐降低,内耗峰呈现先变窄后变宽的趋势;PU和EP含量分别是60%和40%时为最佳配比。
Using TDI,MPEG and E20 as raw materials,hydrophilic PU/EP film-forming resin was synthesized by two-step polymerization.The valence bond structure of the film-forming resin and the effects of PU and EP on the hydrophilicity,water absorption ratio,mechanical strength and dissipation factor of the film-forming resin were studied by means of Spectrum BXⅡ FTIR,JGW-360 contact angle tester,TH-5000 N electronic universal testing machine,METTLER-TOLEOO DMA. Results showed that PU/EP film-forming resin was successfully prepared by two-step polymerization. With the increase of PU content,the hydrophilicity,water absorption ratio and tensile strength of the resin increased,whereas the shear strength decreased to a certain extent,and the glass transition temperature gradually reduced,as well as the internal friction peak showed a trend of first narrowing and then widening. The optimal contents of PU and EP were 60% and 40%,respectively.
引文
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