摘要
用异佛尔酮二异氰酸酯(IPDI)、聚酯二元醇、二羟甲基丙酸(DMPA)、乙二胺、二乙醇胺、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)、甲基丙烯酸羟乙酯(HEMA)通过原位聚合方法合成了聚氨酯(脲)/聚丙烯酸酯水分散液,并且通过溶胶-凝胶方法合成了聚氨酯(脲)/聚丙烯酸酯/硅溶胶(PU(U)A/SiO2)杂化水分散液.杂化水分散液在pH值为7-11时的贮存稳定性大干1年;经高温、冻融试验后,无絮凝或沉淀出现, 与PU(U)A水分散液相同.杂化膜的摆杆硬度、粘附力、耐吸水性、耐溶剂性比无硅溶胶的膜性能好.PU(U) A/SiO2杂化水分散稀溶液成膜后的透射电镜(TEM)结果表明,粒径为8—10nm的硅溶胶(SiO2)包覆在粒径为50-200nm的PU(U)A粒子外围.ART—FTIR分析结果表明,杂化膜表面富含Si-O-Si官能团.AFM结果表明,与PU(U)A膜相比,杂化膜的硬区相畴尺寸变小.
Waterborne Polyurethane （urea）/polyacrylate （ PU（ U ）A） dispersion was synthesized from 1 - iso- cyanato - 3,3,5 - trimethyl - 5 - isocyanato - methyl - cyclohexane, dimethylol propionic acid, polyester polyol （ Mn = 2000g/mol, f = 2 ） , ethyldiamine, diethanol amine, methyl methacylate, butyl acrylate and hydroxyethyl methacrylate by using the in -situ polymerization, and PU （U）A/SiO2 hybrid dispersion was obtained then by using the sol - gel process. The storage time of the hybrid dispersion was more than one year at pH 7 ～ 11. Its heat stability, freeze -thaw stability was just the same of PU（U）A dispersion. The properties of the hybrid film, including hardness, adhesion, absorption of water and solvent resistance were better than those of the film without SiO2. TEM photograph of the PU（U）A/SiO2 hybrid dispersion showed that the PU （U） A particles with the diameter of 50 ～ 200nm was surrounded by silica particles with the diameter of 8 ～ 10nm. ART - FTR showed that the Si - O - Si groups enriched on the surface of the hybrid film. AFM revealed that, compared with the surface of PU（U）A film, the size of hard domains became smaller.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2005年第4期344-346,共3页
Materials Science and Technology
基金
国家自然科学基金资助项目(50073005).
关键词
聚氨酯(脲)/聚丙烯酸酯
硅溶胶
杂化材料
水性涂料
膜性能
polyurethane （urea）/polyacrylate
colloidal silica
hybrid material
water - borne coating
film property
