【作者】 杨琪；

【导师】 朱秀玲；

【作者基本信息】 大连理工大学 ， 高分子材料， 2012， 硕士

【摘要】 水性聚氨酯拥有溶剂型聚氨酯的高性能和水性聚氨酯(WPU)体系环保性的双重优点,随着环保意识的逐渐增强以及相关法规的出台,水性聚氨酯的研究越来越受到关注。本文旨在合成一种基于可再生资源环保型高性能水性聚氨酯,探讨各因素对合成过程的影响,通过与多异氰酸酯固化剂交联成膜,研究各种因素对其成膜性的影响,优化固化工艺条件,并讨论不同的因素对漆膜性能的影响。本文以松香和马来酸的加成物马来松香与一缩二乙二醇进行酯化反应合成马来海松酸聚酯多元醇(MAPP),通过红外光谱法和核磁表征其结构,经GPC测定分子量为2.2×103。从MAPP出发制备了阴离子型和阳离子型的双组分水性聚氨酯水分散体,表征了乳液粒径及其稳定性。然后将聚氨酯水分散体与多异氰酸酯混合,制备了松香基双组分水性聚氨酯漆膜。对固化后的漆膜通过FT-IR进行了表征,证明了结构与所设计结构一致。论文研究了固化反应条件对漆膜性能的影响。系统讨论了漆膜的各项物理性能,如漆膜的硬度、冲击强度、柔韧性、附着力、耐水和耐酸碱性。通过热重分析、拉伸测试、动态接触角等测试系统考察了松香基组份对漆膜性能的影响。实验表明随着MAPP含量的增加,漆膜的耐热性、拉伸强度和硬度显著提高。所制备的漆膜性能优良,硬度达到6H,柔韧性0.5mm,10%热失重高达309℃,拉伸强度达到20.1MPa,其性能可与溶剂型双组份聚氨酯相媲美,显著降低有机挥发物的排放,能够满足环保要求,在涂料和胶黏剂等领域中有着广阔的应用前景。更多还原

【Abstract】 Waterborne polyurethane has two merits:the high performance of solvent based polyurethane and the low VOC value of water based polyurethane(WPU).With the environmental protection consciousness gradually being strengthened and relevant regulations issued.the research of waterborne polyurethane has gotten more and more attention. This paper aimed at synthesizing one environmental friendly PU coating with high performance and renewable resources contained, and factors which affected the synthesis are also discussed.Through crosslinking with curing agent of polyisocyanates, studied effect of the factors on the process of forming a film, optimised the curing process conditions and discussed the influence of the performance of the film.In this paper the maleopimaric acid polyester polyols(MAPP) was synthesized from diglycol and maleric rosin which was the adduct of rosin and maleric acid by esterification. The product is white and the molecular weight is2.2×103by the determination of GPC.The structure was been characterized by FT-IR and1H-NMR and tested particle size and stability of the dispersion. Anion and cation two-component water-borne polyurethane coating containing hydroxyl components, namely polyurethane dispersion was prepared with homemade MAPP. Then two-component waterborne polyurethane based on rosin was prepared by combined hydrophilically-modified polyisocyanate with polyurethane dispersion. Infrared spectroscopy(IR) was used to characterize the curing film. The results showed the accordance with molecular structure. The effect of curing process on film performances was studied in detail. And the physical properties of the film, such as hardness, impact strength, flexibility, adhesion, water resistant and acid and alkali resistance were investigated systematically.Performances of films processinged by different polyols、isocyanate and content of MAPP was discussed through thermogravimetric analysis、tensile test and dynamic water contact angle. The experiment shows that with the increase of the content of MAPP, heat resistance, tensile strength, hardness have been improved significantly. The film with excellent performance was obtained:Its pencil hardness was6H, and the flexibility was0.5mm,10%thermo-gravimetric as high as309℃,tensile strength was20.1MPa. It achieved the performance standards of two-component solvent polyurethane coatings and greatly reduced the emissions of volatile organic and met the requirements of environmental protection.It would have broad application prospects in the field of coating and adhesive.更多还原