【作者】 陈晶晶；

【导师】 朱传方；

【作者基本信息】 华中师范大学 ， 应用化学， 2008， 硕士

【摘要】 低VOC含量的水性聚氨酯涂料具有广阔的应用前景,已开始大量的在纺织印染、皮革、涂料、粘合剂、木材加工、建筑和造纸等行业进行推广应用,为进一步提高水性聚氨酯的性能,使其得到广泛的应用,考虑到纳米氧化硅的优异特性及低成本与原料易得的特点,论文以纳米氧化硅与水性聚氨酯复合及加入交联剂γ-异氰酸酯丙基硅氧烷从而达到提高水性聚氨酯性能的目的。通过应用硅溶胶法对纳米氧化硅包覆改性制成粉状的纳米氧化硅及纳米氧化硅水性分散体,然后以异佛尔酮二异氰酸酯(IPDI)、聚碳酸酯二元醇(PCD)、聚己二酸丁二醇酯多元醇(PBA)、二羟甲基丙酸(DMPA)等为主要原料,以N-甲基吡咯烷酮(NMP)为溶剂,通过加入纳米氧化硅经预聚后乳化再经扩链,得到水性聚氨酯纳米氧化硅复合材料分散体(WPUNS)。通过对所作的水性聚氨酯涂膜后,对树脂的各基本性能如粘度、硬度、附着力、吸水率、断裂伸长、拉伸强度等性能及树脂的微观状态进行表征。分析纳米氧化硅的加入方式、加入量对树脂性能的影响,并对加入纳米氧化硅的原位聚合与共混方式从性能上进行了比较,其结果加入纳米氧化硅原位聚合的水性聚氨酯分散性、抗吸水率、耐热性等均优于共混的水性聚氨酯纳米氧化硅复合材料。为通过加入固化剂进一步提高水性聚氨酯纳米复合材料的性能,论文中以异佛尔酮二异氰酸酯(IPDI)、聚碳酸酯二元醇(PCD)、聚己二酸丁二醇酯多元醇(PBA)、γ-异氰酸酯丙基硅氧烷、二羟甲基丙酸(DMPA)及丙烯酸羟乙酯(HEA)等为主要原料,合成出水性聚氨酯分散体。对树脂性能进行了表征,探讨了γ-异氰酸酯丙基硅氧烷的加入方式、加入量对树脂基本性能的影响。更多还原

【Abstract】 The waterborne polyurethanes（WPU）with low concent of Volatile Organic Component（VOC）have been widely used in printing,leather,coating,bond（adhesive）, architectural,paper-making and other vocation.To spread their using scope,we have to improve the properties of aqueous polyurethanes.Cause of the excellent performance and lower cost,Nano-SiO₂ was used to modified WPU.In this paper we use Nano-SiO₂ to composite with WPU,then add crosslinking agentγ-isocyanatopropyltriethoxysilane to enhence the properties of WPU.The method of silane sol-gel was used to modify the Nano-SiO₂ to obtain the modified silica particles and dispersoid.Then isophoronediisocyanate（IPDI）, polycarbonate diol（PCD-1000）,Poly（1,4-butylene adipate）diol（PBA）,dimethylol propionic acid（DMPA）and N-methyl-2-pyrrolodone（NMP）were used as the main materials,adding the modified silica particles,we can receive the prepolymer, emulsification and chain extension an aqueous dispersion（WPUNS）was prepared.The properties of WPU such as viscidity,rigidity,Tensile strength,Elongation at break,water absorption was analysed in this paper.Discussing the different methods and amount of adding nano-SiO₂,we found that WPU in in-suit polymerization have better in decentralization and resistance to high temperature and water than the blending method.In order to improve the properties of WPUNS,we added the curing agent,the isophoronediisocyanate（IPDI）,polycarbonate diol（PCD-1000）、Poly（1,4-butylene adipate） diol（PBA）,dimethylol propionic acid（DMPA）and Hydroxyethyl acrylate（HEA）were used as the main materials to prepare the WPU;The WPUNS’properties were characterized and the influence of the way and the amount of addingγ-isocyanatopropyltriethoxysilane were discussed.更多还原