摘要： 以自制的N-(2-氨基乙基)氨基乙磺酸钠(AAS-Na)为亲水单体,2,4-甲苯二异氰酸酯(TDI)作为主要硬段,采用丙酮法合成了固含量大约为50%的聚氨酯分散体(PUDs)。激光粒度分析表明PUDs胶粒平均粒径60～160 nm,部分PUDs胶粒呈二元分布,Zeta电位处于-50～-65 mV之间,黏度均小于200 mPa·s。透射电镜(TEM)显示PUDs胶粒呈不同尺寸的不规则球形结构。DMA测试显示PUDs膜未见软硬段的相分离,玻璃化温度(T_g )在-35～-20℃之间。电子拉力机测试结果表明伸长率为2 000%的定伸强度大多处于5～10 MPa之间,断裂伸长率均高于2 000%。

关键词: N-(2-氨基乙基)氨基乙磺酸钠, 2,4-甲苯二异氰酸酯, 高固含量, 聚氨酯分散体

Abstract: Polyurethane dispersions (PUDS ) about 50% solid content were synthesized by acetone process using 2, 4-toluene diisocyanate(TDI) as primary component in hard segment and ethylenediamine sodium sulphonate (AAS-NA )as a new type of highly versatile hydrophilic chain extender. Results showe that the average particle sizes of PUDS were at 60-160 nm, particle size distribution (PSD)of some samples was bimodal distribution, and the value of zeta potentials of PUDS was between -50-65 mv, which revealed an excellent stability of PUDS. Brookfield viscosity was lower than 200 mPa·s. Transmission electron microscope(TEM)analysis showed PUDS particles were spherical shapes with different sizes. Dynamic mechanical thermal analysis (DMA) revealed that the films of PUDS with low T_g were between -35~-20 ℃, and PUDS films had good compatibility of soft and hard segment and no phase separation. The measure of tensile tests showed that the ultimate elongation of PUDS cast films was over 2 000% and the tensile strength was 5~10 MPa at the elongation of 2 000%.

Key words: ethylenediamine sodium sulphonate, 2, 4-toluene diisocyanate, high solid content, poly urethane dispersion