【摘要】 利用废弃对苯二甲酸乙二醇酯(PET)对国产二聚酸型聚酰胺(PA)进行改性,合成了满足热缩材料、电视机和汽车等领域使用要求的聚酰胺热熔胶。采用GPC、DSC、SEM等测试手段对产品进行表征,分析了合成过程,考察了影响产品性能的主要因素,并将所得产品与改性前PA及进口同类产品性能进行比较。结果表明:该反应主要由酯-酰胺交换、醇解和缩聚三步构成;共混时间延长,温度升高,酯-酰胺交换程度加深,产品软化点升高;PET加量增加,产品软化点提高,超过20%时,体系相容性变差,产品呈脆性;缩聚时间越长,产品黏度越大,软化点越高。更多还原

【Abstract】 The title polyamide hot-melt adhesive has been prepared by modification of domestic dimer acid PA with wasted PET,which can meet the demands of heat shrinkable joint closure,TV and vehicles.The reaction process and structure of products were investigated using GPC,DSC and SEM.Factors affecting the properties of copolymer were studied.The properties of the product was compared with unmodified PA and the similar imported products.The results show that ester-amide exchange,alcoholysis and polycondensation are primary reactions.Ester-amide exchange is stressed if the blending time is prolonged and temperature is increased,which will cause increase of the softening point of products.The softening point is also increased with the increasing of PET amount and when it is above 20%,the compatibility of system is down and the product becomes brittle.The apparent viscosity and softening point of products are augmented with increasing of polycondensation time.The properties of the products have been reached the standard of the imported products.更多还原