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以改性蓖麻油(MCO)、聚碳酸酯二醇(PCDL)、异佛尔酮二异氰酸酯(IPDI)、六亚甲基二异氰酸酯(HDI)和二羟甲基丙酸(DMPA)等为原料合成水性聚氨酯种子乳液,通过MCO的双键活性位实现丙烯酸酯(AC)单体的种子乳液聚合,得到聚氨酯–丙烯酸酯(PUA)乳液。通过FT–IR(傅里叶变换红外光谱)分析、激光粒度仪、旋转黏度计研究了AC单体含量及配比、助剂用量对PUA乳液性能的影响。通过电子拉力试验机、耐水试验和动态力学分析仪研究了不同AC含量PUA膜的力学、耐水和动态力学性能。结果表明:通过种子乳液共聚,PUA均显示一个玻璃化温度,说明聚丙烯酸酯与聚氨酯具有较好的相容性;当n(MCO):n(PCDL)=1.2,n(甲基丙烯酸正丁酯):n(甲基丙烯酸甲酯)=0.9,w(乳化剂SDS)为2.0%,w(引发剂AIBN)为0.2%时所合成的PUA稳定性最好,且具有适中的黏度和较好的粒径分布;随AC含量的提高,PUA胶膜耐水性提高,胶膜硬度和弹性模量逐渐提高,拉伸强度和伸长率均在w(AC)为10%时出现最大值。
The modified castor oil (MCO), polycarbonate diol (PCDL), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI) and dimethylolpropionic acid (DMPA) The aqueous polyurethane seed emulsion was synthesized and the seed emulsion polymerization of acrylic acid (AC) monomer was achieved through the double bond active site of MCO to obtain polyurethane-acrylate (PUA) emulsion. The effects of the content of AC monomer and the ratio of the auxiliary agent on the properties of PUA emulsion were studied by FT-IR (Fourier transform infrared spectroscopy), laser particle size analyzer and rotational viscometer. The mechanical, water and dynamic mechanical properties of PUA films with different AC content were studied by electronic tensile testing machine, water resistance test and dynamic mechanical analyzer. The results showed that PUA showed a glass transition temperature through the seed emulsion copolymerization, indicating that polyacrylate had good compatibility with polyurethane. When n (MCO): n (PCDL) = 1.2, n (n-butylmethacrylate Ester): n (methyl methacrylate) = 0.9, w (emulsifier SDS) was 2.0% and w (initiator AIBN) was 0.2%, the synthesized PUA had the best stability and moderate viscosity Good particle size distribution. With the increase of AC content, the water resistance of PUA film increases, the hardness and elastic modulus of the film gradually increase, and the tensile strength and elongation reach the maximum value when w (AC) is 10%.