磺酸型亲水单体扩链制备水性聚氨酯的研究

以聚氧化丙烯二醇（N210）和2，4-甲苯二异氰酸酯（TDI）为原料，以自制的磺酸型亲水单体1,2-二羟基-3-丙磺酸钠（DHPA）作为扩链剂，制备了磺酸型水性聚氨酯乳液；研究了R（NCO/OH）值、DHPA含量对乳液及胶膜力学性能的影响，通过红外光谱对产物的结构进行了表征。结果表明，随着R值的增大，乳液的黏度下降，胶膜的拉神强度增大，断裂伸长率下降；同时，当R为2时，随着DHPA的增加，乳液的平均粒径变小，乳液的稳定性逐渐增强，胶膜的拉伸强度逐渐增大，断裂伸长率则先增大后减小。当DHPA为5％时，胶膜的力学性能最佳。

Study on preparation of waterborne polyurethane with sulfonate hydrophilic chain extending agents

In this paper,waterborne polyurethane containing both carboxylic and sulfonic groups was synthesized using toluene diisocyanates and polyether glycol as materials with 1,2-dihydroxy-3-propanesulfonic acid salt as hydrophilic chain-extending agents.The chemical structure of the product was characterized with FTIR spectrum.The effects of R(the radio of NCO and OH) and content of DHPA on the properties of film were mainly studied by testing properties.The experiment results show that viscosity of the aqueous polyurethane emulsion decreases,tensile strength increases and elongation at break becomes weak with increasing value of R;In addition,when R is 2 viscosity of the aqueous polyurethane emulsion and tensile strength increase,but elongation at break increases then decreases.And when DHPA% is 5%,the film with excellent properties is prepared.