氨基磺酸盐型水性醋酸纤维乳液的制备与性能

采用乙二胺基乙磺酸钠(AAS)作为亲水剂,在二月桂酸二丁基锡(DBTDL)的催化下,通过异佛尔酮二异氰酸酯(IPDI)将亲水基引入二醋酸纤维(CA)分子中,制得了一种氨基磺酸盐型水性醋酸纤维乳液(SWCA)。利用FTIR、DLS、黏度计、TEM、SEM、接触角测量仪、XRD、TGA,对SWCA结构及涂膜性能进行表征。考察了IPDI与AAS物质的量比对SWCA乳液粒径、黏度、涂膜表观形貌及耐水性的影响。结果表明:当n(IPDI)∶n(AAS)=1.1∶1时,乳液最稳定,微观形态呈水包油型(O/W)核壳结构,乳液粒径和分散系数(PDI)最小,分别为128nm和0.112,此时乳液表观黏度最大,为73.5m Pa·s,所成涂膜致密平整,接触角可达110.2°±2°,表现出明显的疏水性;此外,与二醋酸纤维相比,SWCA涂膜结晶性减弱,呈微晶态或次晶态结构,且具有较好的耐热性。

Preparation and properties of sulfamate waterborne cellulose acetate emulsion

2-(2-aminoethyl)amino]-ethanesulfonic acid monosodium salt (AAS) was selected as hydrophilic chain extender. By the introduction of hydrophilic group into CA molecular through IPDI, under the catalysis of DBTDL, a kind of sulfonate waterborne cellulose acetate emulsion (SWCA) was prepared, and cast into a film. The structure and properties of SWCA and coating film were characterized by FTIR, nano-particle size analyzer, viscometer, TEM, SEM, contact angle measuring instrument, XRD and TGA. The effects of IPDI and AAS molar ratio on particle size, viscosity, surface morphology and water resistance of SWCA were investigated. The results demonstrated that when n(IPDI/AAS)=1.1, the emulsion was the most stable, and microscopic morphology was in oil-in-water (O/W) core-shell structure; the particle size and dispersion coefficient (PDI) of the emulsion were the smallest (128 nm and 0.112, respectively); Meanwhile, the apparent viscosity of the emulsion was 79.8 mP?s, and the resulting film was compact and smooth. When n(IPDI/AAS) ranged from 1.1 to 1.4, the film contact angle increased from (75.9??2?) to (110.2??2?) with the decrease of n(IPDI/AAS). In addition, microcrystalline or subcrystalline SWCA film was obtained after the modification. Compared with CA, the SWCA coating film has weaker crystallinity, and it has a microcrystalline or subcrystalline structure and has good heat resistance.