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水性聚氨酯改性研究进展 总被引:7,自引:0,他引:7
吕维忠 《合成材料老化与应用》2003,32(3):36-38
详细讨论了水性聚氨酯的性能与改性研究,对水性聚氨酯今后的发展提出了建议。 相似文献
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主要总结了几种提高水性聚氨酯综合性能的交联改性方法,包括内交联改性水性聚氨酯、外交联改性水性聚氨酯及其作用机理;综述了近年来国内外最新研究进展,旨在加深人们对水性聚氨酯的研究了解。 相似文献
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环氧硅烷外交联改性水性聚氨酯的研究 总被引:5,自引:2,他引:5
合成阴离子型水性聚氨酯,使用环氧硅烷外交联改性水性聚氨酯。研究发现,环氧硅烷经预乳化之后能够与水性聚氨酯相容,改性之后的水性体系能够保持较长时间稳定而不凝胶,有效贮存期超过3个月。随着环氧硅烷用量的增加,涂膜的拉伸强度逐渐增加,延伸率先持续下降,后略有增加,吸水率大幅下降,粘接强度得到明显的提高。 相似文献
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主要对光固化脂肪族水分散聚氨酯的合成与性能进行了初步的探讨。利用多元醇,异氟尔酮二异氰酸酯和丙烯酸羟丙酯合成了稳定的可紫外光固化的水分散性聚氨酯乳液,并发现随着光照时间和丙烯酸羟丙酯用量的增加,聚氨酯薄膜的拉伸强度增加,断裂伸长率下降,在有机溶剂中的溶胀下降。 相似文献
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水性聚氨酯的合成及改性研究 总被引:7,自引:0,他引:7
以甲苯二异氰酸酯、聚醚二元醇、二羟甲基丙酸为主要原料合成了水性聚氨酯乳液。采用二乙烯三胺内交联改性水性聚氨酯。研究发现,改性乳液常温贮存性好,有效贮存期超过5个月,但常温成膜的性能较差,热处理之后随着二乙烯三胺用量的增加,涂膜的拉伸强度增大,吸水率极大的下降,性能得到改善。 相似文献
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Aqueous polyurethane (APU) dispersions having a solid content of 50% were synthesized using dimethyol propionic acid (DMPA) as the stabilizing moiety. The principal diols used were poly‐1,4‐butylene adipate glycol (PBA). The diisocyanates used in this study were a 30:70 blend of hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI). All these samples were neutralized using triethylamine (TEA) and chain‐extended using ethylene diamine (EDA). The effects of the COOH content, NCO/OH molar ratio, and molecular weight (Mn) of PBA on the properties of APU dispersion and its cast film were studied. Dynamic light scattering results revealed that these high solid content dispersions shown broad particle size distributions as well as bimodal. Differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMA) results showed that as the hard segment content increased, the melting point (Tm) of the APU cast film increased, but the glass transition temperature (Tg) did not show significant alteration, when a PBA lower than 1000 Mn was used, the APU exhibited faint soft‐segment crystallization and tended to form amorphous polymer. Tensile and T‐peel strength tests attained excellent mechanical properties, such as a maximum Young's modulus of 166 MPa and the elongation at break reached to 2000%. T‐peel strength test (PVC/PVC) yielded a maximum peel strength value of 8.8 N/mm. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 相似文献
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