摘要
以聚碳酸亚丙酯多元醇(PPC)、异佛尔酮异氰酸酯(IPDI)、1,6-己二醇(HDO)和二羟甲基丙酸(DMPA)为起始原料,三乙胺(TEA)为中和剂,三羟甲基丙烷(TMP)和环氧树脂(E-44)为交联改性剂,乙二胺(EDA)为后扩链剂,合成了固含量为35%的水性聚氨酯,并用傅里叶变换红外光谱(FT-IR)、激光粒度仪、拉力试验机对产物进行了测试。结果表明:当(n(—NCO)/n(—OH))=1.5,DMPA含量5.8%,E-44含量4%,TMP含量2%,乙二胺扩链度20%时,所得涂膜的100%模量为6.4MPa,拉伸强度36.8MPa,断裂伸长率630%,吸水率9.8%。乳液应用于半PU合成革面层时,制品耐磨超过2.6万次、低温耐折牢度超过3万次、表面色牢度干湿擦等级为4~5/4,恒温恒湿(温度70℃、相对湿度95%)7d后力学性能无明显下降。
Poly （propylene carbonate） based waterborne polyurethane （PPC-WPU） with 35% solid content was prepared with poly （propylene carbonate） polyols （PPC）,isophorone diisocyanate （IPDI）,1,6-Hexan-ediol （HDO） and dihydroxy methyl propionic acid （DMPA） as main initial materials,triethylamine（TEA） as neutralizing agent,ethylenediamine （EDA） as further chain extender,trimethylolpropane （TMP） and epoxy resin （E-44） as cross-linking modification agents.Then PPC-WPU was characterized by Fourier transform infrared spectrometer （FT -IR）,laser particle analyzer and universal testing machine.The results show that when the molar ratio of n （-NCO）/n（-OH） is 1.5,w（DMPA）=5.8%,w（E-44）=4%,w（TMP）=2%,and the degree of EDA chain extender is 20%,the 100% modulus of the obtained films is 6.4Mpa,the tensile strength is 36.8MPa,the elongation at break is 630%,and the water absorptivity of PPC-WPU films is 9.8%.When PPC-WPU is applied in semi-PU synthetic leather surface layer,the abrasion resistance of resultant leather is more than 26 000times,low temperature folding resistance is more than 30 000times and color fastness to dry-wet rubbing grade is 4 ～ 5/4.No significant decline in mechanical properties can be observed after 7-day constant-temperature-and-humidity test at 70℃ with 95% Relative humidity （RH）.
出处
《中国皮革》
北大核心
2017年第7期56-62,共7页
China Leather
基金
福建省2012年省产学研联合开发专项资金([2012]747号)
关键词
水性聚氨酯
半PU合成革
表面处理
聚碳酸亚丙酯二元醇
耐磨
耐水解
waterborne polyurethane
semi-PU synthetic leather
surface treatment
poly （propylene carbonate）
abrasion resistance
hydrolysis resistance
