硫脲改性聚醚胺环氧固化剂的性能研究

Thiourea modified polyether amine curing agents and their performance

采用硫脲改性3种不同分子质量的聚醚胺制备环氧固化剂,通过红外光谱、固化剂的粘度和胺值、固化干燥时间、固化物力学性能测试等研究了反应温度对产物结构,聚醚胺分子质量对固化剂性能、固化剂用量和固化时间对体系性能的影响。结果表明,改性反应温度应不高于130℃,较高分子质量的D2000不适于硫脲改性,低分子质量的聚醚胺硫脲改性固化剂在-10℃下16~18 h即可达到实干。以聚醚胺D230和D400改性的固化剂具有良好的低温固化性能和力学性能,在-10℃下固化7 d后的压缩强度分别为70 MPa和64 MPa,拉伸强度分别为46 MPa和45 MPa,剪切强度分别为14 MPa和13 MPa。

The epoxy curing agents were prepared by modifying three different molecular weight polyether amines with thiourea. The effects of reaction temperature on the product structure,molecular mass of polyether amine on the curing agent performance,curing agent amount and curing time on the system performance were investigated by infrared spectroscopy,testings of amine value and viscosity of the curing agent,curing drying time and mechanical properties of the cured products. The results showed that the modified reaction temperature should below 130 ℃.The higher molecular weight D2000 was not suitable for using thiourea modifying. The thiourea modified low molecular weight polyether amine curing agent could dry at-10 ℃ for 16-18 h. The modified D230 and D400polyether amine curing agent had good low temperature curing and mechanical properties. The compressive strength after curing at-10 ℃ for 7 d were 70 MPa and 64 MPa,tensile strength were 46 MPa and 45 MPa and shearing strength were 14 MPa and 13 MPa,respectively.