【摘要】 以三羟甲基丙烷作为交联剂,探讨了三羟甲基丙烷的用量对水性聚氨酯的乳液性能、涂膜吸水率、力学性能及耐黄变性能的影响,并通过差示扫描量热法分析了三羟甲基丙烷的加入对聚氨酯低温性能的影响。结果表明:三羟甲基丙烷的加入可以明显降低聚氨酯涂膜的吸水率,提高其抗张强度,改善其耐黄变性能,也会降低聚氨酯涂膜的断裂伸长率,提高其玻璃化转变温度。更多还原

【Abstract】 The influences of the TMP dosage on the emulsion behaviors,film’s water absorption,mechanical properties and yellow-stain resistance property of polyurethane were discussed,with trimethylolpropane(TMP) as cross-linking agent.The influence of the introduction of TMP on the cryogenic property of polyurethane was analyzed by DSC.The results show that the introduction of TMP may dramatically improve the water resistance,the tensile strength and the yellow-stain resistance of the polyurethane film.And TMP may also decrease the elongation at rupture and enhance the glass transition temperature(Tg) of the films.更多还原