【摘要】 用丙酮法合成了经三羟甲基丙烷(TMP)、环氧树脂(E-20)和甲基丙烯酸甲酯(MMA)改性的阴离子型自乳化水性聚氨酯(PU)分散体,得到了具有核壳结构的聚氨酯-聚丙烯酸酯(PUA)复合分散体。研究了n(NCO)/n(OH)、二羟甲基丙酸(DMPA)、TMP、E-20、MMA和乙二胺(EDA)用量对复合分散体粒径、贮存稳定性、稀释稳定性、离心稳定性、Ca2+离子稳定性、冻融稳定性的影响。结果表明:当n(NCO)/n(OH)=1.3~1.5、n(NH2)/n(NCO)=0.3~0.5,以及DMPA、TMP、E-20和MMA在PUA中的质量分数分别为7.5%、1.5%~3.0%、4%~6%和20%~30%时,获得了漆膜摆杆硬度大于0.75、吸水率低于8.9%、贮存稳定性按GB6753.3—86检测,30 d未出现不良变化的PUA复合分散体。目前,该分散体作为水性木器漆的树脂,已经在国内某企业稳定生产和销售,累计销售量已达8 000 t。更多还原

【Abstract】 An anionic self-emulsified waterborne polyurethane dispersion,which was modified by trimethylolpropane(TMP),epoxy resin(E-20) and methyl methacrylate(MMA),was prepared using acetone as the solvent.Then,a core/shell waterborne polyurethane/polyacrylate(PUA) hybrid dispersion was obtained.When n(NCO)∶n(OH)=1.3～1.5,n(NCO)∶n(NH2)=(0.3～0.5)∶1,charges of DMPA,TMP,E-20 and MMA were 7.5%,1.5%～3.0%,4%～6% and 20%～30%(mass fraction to PUA),respectively,a PUA hybrid dispersion with hardness>0.75,water uptake<8.9% and good storage stability(unchanged after 30 days according to GB6753.3—86) was obtained.At present,this kind of dispersion is produced and sold regularly as resin for waterborne wood coating in a domestic manufactory,and about 8 000 tons of this kind of dispersion have been sold.更多还原