摘要
为了得到耐水解、软而不粘软革用水性聚氨酯，在优化聚醚二元醇、异氰酸酯配比前提下。研究了后交联和后扩链对聚醚型水性聚氨酯防粘性能的影响。结果表明：当摩尔比n（PPG）：n（PTMG）=3：3，n（IPDI）：n（HDI）=3：1，选用KH550作为后交联剂，用量为乳液的0．2％时，100％模量和拉伸强度分别为0．94MPa和6．02MPa，断裂伸长率可达800％，所得涂层柔软、防粘性大幅提升。在水性聚氨酯分散体中继续添加H12MDI进行后扩链后，进一步提升了涂膜的拉伸强度、断裂伸长率和防粘性。
In order to get the hydrolysis resistant and anti-stickiness of waterborne polyurethane for soft leather, the influences of post-crosslinking and post-chain extension on the anti-stickiness of polyether type waterborne polyure- thane were investigated based on optimization of mole ratio of polyether diol and isocyanate. Results indicate that when mole ratio ofn （PPG） ： n （PTMG） is 3 ： 3, n （IPDI） ： n （HDI） is 3 ： 1, KH550 is chosen as the post crosslin ing agent and the dosage is controlled to 0.2% （based emulsion mass）, The 100% modulus and tensile strength of the films are 0. 94MPa and 6.02MPa respectively, the elongation at break reaches 800%. The softness and anti-stickiness of films are improved. After post chain extension by adding H12MDI to the waterborne polyurethane dispersions, the tensile strength, elongation at break and anti-stickiness of the coating are further enhanced.
作者
徐佳丽
范浩军
梁飞飞
颜俊
XU Jiali;FAN Haojun;LIANG Feifei;YAN Jun(National Engineering Laboratory for Clean Technology of Leather Manufacture,Sichuan University,Chengdu 610065,China;Synthetic Leather Research Center,Sichuan University,Chengdu 610065,China;State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China)
出处
《中国皮革》
CAS
2018年第10期48-55,共8页
China Leather
基金
国家重点研发计划项目项目资助(项目资助号2017YFB0308600)
关键词
聚醚型水性聚氨酯
后交联
后扩链
防粘性
软革
polyether type waterborne polyurethane
post crosslinking
post chain extension
anti- stickiness
soft leather
