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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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以甲苯二异氰酸酯(TDI)、聚乙二醇(PEG)和N-甲基二乙醇胺(MDEA)等为主要原料,以蓖麻油(C.O.)作为部分聚醚多元醇的替代物,采用PU(聚氨酯)预聚体法制备出具有一定交联结构的亲水性阳离子型WPU(水性聚氨酯)乳液。结果表明:当体系交联度较低时,C.O.对WPU的改性效果不明显;当体系交联度较高时,WPU乳液稳定性及其胶膜耐水性等均随C.O.比例增加而提高;当n(PEG)∶n(C.O.)=7∶3时,WPU胶膜的耐水性(吸水率约6%)相对最好,其静态接触角(约82°)相对最大。 相似文献
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以蓖麻油为原料,通过与马来酸酐半酯反应合成了改性蓖麻油树脂(HEAMACO).该树脂分子链上含有较多的可参与白由基反应的双键,经与稀释单体笨乙烯共聚合,可形成一种具有生物降解性的热固性塑料。详细研究了固化反应温度、苯乙烯的含量、引发剂和促进剂的含量对所制得的热固性材料的物理力学性能的影响。结果表明:该材料的玻璃化温度(Tg)及力学性能均随笨乙烯含量的增加而升高,而且增加引发剂和促进剂的用量也有利于材料性能的提高。随苯乙烯含量的不同,该固化材料具有从软质到半硬质材料的特性,Tg介于10~60℃之间,土埋实验初步表明该材料具有良好的生物降解性。 相似文献
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环氧改性蓖麻油基水性聚氨酯树脂的结构与性能 总被引:1,自引:0,他引:1
用蓖麻油(CO)、聚四氢呋喃醚二醇(PTHF)、甲苯二异氰酸酯(TDI)、二羟甲基丙酸(DMPA)、环氧树脂(E—12)合成了水基聚氨酯树脂,去离子水乳化得到蓖麻油交联改性和环氧复合改性的水性聚氨酯乳液。通过拉伸、TG等测试手段表征了乳液的机械性能、热性能及耐化学品性能。结果显示:当蓖麻油的添加量为7.1%,环氧树脂含量为13.7%时,材料的机械性能达到最佳,环氧树脂的引入明显改善了材料的耐水性和耐温性,如耐水性达到120h无异常,耐沸水15min无变化。 相似文献
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Synthesis and Properties of Waterborne Polyurethane Dispersions with Ions in the Soft Segments 总被引:3,自引:0,他引:3
A maleic anhydride modified castor oil (MCO) was used to prepare aqueous polyurethane dispersions (MCPUs) with ionic groups in the soft segments according to the prepolymer mixing process. The aliphatic polyether PU prepolymer was prepared with MCO and polyether glycol (Ng210) as polymeric glycol component. The prepolymer was dispersed under vigorous agitation by adding water and by chain extension with ethylene diamine. The effects of r
m (the mass ratio of MCO and Ng210) on the properties of the resultant waterborne polyurethanes (MCPUs) were studied. Structures and properties of the MCPU dispersions and their films were examined by FT-IR, particle size analyzer, DTG, DSC, WAXD, SEM and tensile tester. The MCPUs exhibit higher phase mixing with increasing of r
m. 相似文献
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蓖麻油和丙烯酸酯双重改性水性聚氨酯复合乳液的研制 总被引:2,自引:0,他引:2
以1,4-丁二醇(BDO)、二羟甲基丙酸(DMPA)和乙二胺(EDA)为扩链剂,蓖麻油(C.O.)为内交联剂,以甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)改性聚氨酯(PU)制得水性聚氨酯-丙烯酸酯复合乳液(PUA).研究了C.O.、DMPA和BA对乳液及涂膜性能的影响. 相似文献
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Chengshuang Wang Jie Zhang Jieru Huang Han Wang Meng He Liang Ding 《European Journal of Lipid Science and Technology》2021,123(4):2000248
Although tremendous efforts have been dedicated to developing environmentally friendly bio-based waterborne polyurethane (WPU) dispersions from vegetable oil, the fabrication of WPU dispersions solely derived from vegetable oil-based polyol with excellent comprehensive properties is still challenging. In the present work, novel bio-based WPU dispersions derived from castor oil and soy polyol is successfully modified by phosphorus-nitrogen chain extender [bis(2-hydroxyethyl)amino]-methyl-phosphonic acid dimethyl ester (BH). The structure and properties of the dispersions and films are characterized systematically by Fourier transform infrared spectroscopy, thermogravimetric analysis , mechanical test, and limiting oxygen index (LOI), etc. The results indicate that bio-based WPU films display moderate mechanical performance by adjusting BH content, and the WPU film containing 100% BH with 47.8% biobased content has a tensile strength of 8 MPa and the highest Young's modulus of 62.3 MPa. The incorporation of BH can increase the production of char residue. The flame retardancy of WPU films increase gradually with the BH molar content, and the LOI value of the WPU100 with 1.53 wt% phosphorus content can reach as high as 28.1%. This work may provide a new approach to develop high biobased content, eco-friendly, flame retardant WPU for application in the surface coating industry. 相似文献
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以聚氧化丙烯二醇(PPG)和异佛尔酮二异氰酸酯(IPDI)为原料,蓖麻油(CO)和环氧树脂(E-44)为交联剂,采用预聚体分散法合成了一系列用于皮革涂饰的环氧树脂蓖麻油双重改性水性聚氨酯(ECOWPU)。采用FTIR、TEM、DSC、TGA对聚合物结构及膜的性能进行了分析。FTIR表明聚合物中引入了蓖麻油和环氧树脂,羟基和环氧基均参与反应。通过TEM可观察乳液颗粒呈球形,粒径较为均匀。DSC表明,改性后胶膜的微相分离程度增大。TGA表明,环氧树脂和蓖麻油的加入提高了聚氨酯的热稳定性。蓖麻油、E-44含量的增加,均使胶膜拉伸强度逐渐增大,断裂伸长率、吸水率降低。当蓖麻油添加量为4.9%,E-44添加量为7%时,胶膜的综合性能最佳。 相似文献
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水性聚氨酯涂料的制备 总被引:3,自引:0,他引:3
李文安 《精细与专用化学品》2004,12(15):26-28,25
采用聚酯二元醇与甲苯二异氰酸酯 (TDI)和二羟甲基丙酸 (DMPA)反应合成水性聚氨酯分散体 ,进一步制成涂料。讨论了影响水性聚氨酯涂膜性能的因素 ,结果表明 ,当—NCO/—OH量比为 1 2时 ,DMPA溶解加入的分步预聚法合成的水性聚氨酯具有较好的机械性能 相似文献