【摘要】 以硝化纤维(NC)、丙烯酸(AA)、丙烯酸羟丙酯(HEPA)、六亚甲基二异氰酸酯(HDI)为主要原料,采用自乳化法制备了聚丙烯酸接枝共聚水性硝化纤维(PWNC)乳液,并进一步制成PWNC涂膜。采用FTIR、表面水接触角测量仪、TEM、TGA和Zeta电位测试了PWNC涂膜的化学结构、疏水性、胶粒形态、耐热性以及PWNC乳液的粒径大小;考察了AA与HEPA物质的量比、偶氮二异丁腈(AIBN)质量分数、HDI用量、单体聚合温度对PWNC乳液和涂膜的影响。结果表明:当n(AA)∶n(HEPA)=3∶1,AIBN质量分数为0.8%、HDI 5.05 g、聚合温度为80℃时,乳液胶粒呈球形,具有核壳结构。乳液粒子平均粒径和分散系数分别是52 nm和0.021;涂膜接触角增加至118.9°,相比于NC涂膜,PWNC涂膜具有优异的耐水性。更多还原

【Abstract】 A polyacrylic modified waterborne nitrocellulose(PWNC) emulsion was prepared by selfemulsification method with nitrocellulose(NC), acrylic acid(AA), hydroxypropyl acrylate(HEPA) and hexamethylene diisocyanate(HDI) as main raw materials. Then, the corresponding PWNC films were obtained. FTIR, contact angle measuring instrument, TEM, TGA and nano particle surface potential analyzer were use to characterize the chemical structure, hydrophobicity, particle morphology, thermal properties of PWNC films and the particle size of PWNC emulsions. The effects of molar ratio of AA to HEPA, the amount of azodiisobutyronitrile(AIBN), dosage of HDI and polymerization temperature on the properties of emulsion and film were also studied. The results showed that when n(AA)∶n(HEPA) was 3∶1,the mass fraction of AIBN was 0.8%, HDI dosage was 5.05 g and polymerization temperature was 80 ℃,the prepared PWNC emulsion colloidal particles were spherical with core-shell structure. The average particle size and polydispersity index(PDI) were 52 nm and 0.021, respectively. The contact angle of PWNC film was 118.9°, which indicated that PWNC film had better water resistance than NC film.更多还原