马来海松酸改性水性聚氨酯的制备及性能研究

摘要

以马来海松酸聚酯多元醇(MAPP)、甲苯二异氰酸酯为原料采用丙酮法制备了马来海松酸改性水性聚氨酯(MWPU).在制备过程中,分别对NCO/OH物质的量比值(R值)、亲水扩链剂二羟甲基丙酸(DMPA)的加入量和MAPP的加入量进行考察,研究各因素对马来海松酸改性水性聚氨酯乳液以及胶膜性能产生的影响,并对所得产品进行了拉伸强度、摆杆硬度、断裂伸长率、耐水性、耐热性等性能的表征.最终数据显示,当R值为1.3、DMPA加入量为5％、MAPP的加入量为30％时,制备的MWPU拉伸强度为23.2 MPa、摆杆硬度为0.7、断裂伸长率为569％、吸水率为14.2％、质量损失5％时温度为258℃.%Waterborne polyurethanes modified by maleopimaric acid (MWPU) were prepared from maleopimaric acid polyester polyols (MAPP) and toluene diisocyanate by acetone method.The effects of NCO/OH value (R value),DMPA amount and MAPP amount on the properties of MWPU emulsions and MWPU films were studied respectively.The properties of the products,such as tensile strength,pendulum hardness,elongation at break,water resistance and heat resistance,were characterized.The comprehensive properties of MWPU were tensile strength 23.2 MPa,pendulum hardness 0.7,elongation at break 569 ％,water absorption 14.2 ％ and 5 ％ weight loss at 258 ℃ on condition of DMPA mass fraction 5 ％,R value 1.3,and the amount of MAPP 30 ％.