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通过自乳化法,分别以3-氨基丙基三乙氧基硅烷与N-甲基二乙醇胺(MDEA)为封闭剂与亲水扩链剂,自制N-(1,1-二甲基-2-乙酰基)乙基]-β-二羟乙氨基丙酰胺(DDP),异佛尔酮二异氰酸酯、聚己内酯二醇、双酚A、ADH为基本原料制备出室温自交联型阳离子聚氨酯纳米水分散液(CBPU)。采用傅里叶变换红外光谱(FT-IR)、动态激光光散射(DLS)、透射电镜(TEM)对CBPU分子结构、乳液粒径与分布及乳胶粒形态进行了研究,研究了封闭率对涂膜表面水接触角及力学性能的影响。结果表明,产物分子结构中出现了叔胺基、Si—O—Si和氨基甲酸酯结构;乳液粒径随封闭率的增加而增加;乳胶粒粒径均一,呈规则的球形结构;增加CBPU封闭率,能提高涂膜的耐水性及力学性能。当CBPU封闭率为15%时,乳液粒径、涂膜水接触角及拉伸强度分别为80.86 nm、83°及23.4 MPa。
By self-emulsification method, 3-aminopropyl triethoxysilane and N-methyl diethanolamine (MDEA) as blocking agent and hydrophilic chain extender, N- (1,1-dimethyl- -acetyl) ethyl] -β-bishydroxyethylaminopropionamide (DDP), isophorone diisocyanate, polycaprolactone diol, bisphenol A and ADH were used to prepare room temperature self-crosslinking type cation Polyurethane nano-aqueous dispersion (CBPU). The molecular structure of CBPU, the particle size and distribution of the emulsion and the morphology of the latex particles were investigated by Fourier transform infrared spectroscopy (FT-IR), dynamic laser light scattering (DLS) and transmission electron microscopy (TEM) Effect of membrane surface water contact angle and mechanical properties. The results showed that the structure of tertiary amine, Si-O-Si and carbamate appeared in the molecular structure of the product. The emulsion particle size increased with the increasing of the blocking rate. The particle size of the latex particles was uniform with a regular spherical structure. Sealing rate, can improve the water resistance and mechanical properties of the coating. When CBPU blocking rate was 15%, the emulsion particle size, water contact angle and tensile strength were 80.86 nm, 83 ° and 23.4 MPa, respectively.