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水性双组分聚氦酯涂料性能研究——丙烯酸树脂分散体对涂膜性能的影响 总被引:2,自引:0,他引:2
丙烯酸树脂分散体作为羟基组分与亲水改性多异氰酸酯配漆,制备水性双组分聚氯酯涂料,研究了丙烯酸树脂分散体的羟值、酸值、玻璃化转变温度等对涂膜性能的影响;用红外光谱仪表征了固化膜的结构,用扫描电镜观察了固化膜的表面形态。结果表明:涂膜的机械性能较好,但耐化学品性和耐水性较差;羟值在100mgKOH/g时性能较好。 相似文献
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水性双组分涂料用丙烯酸酯乳液的羟值因素 总被引:2,自引:0,他引:2
以甲基丙烯酸-β-羟丙酯(HPMA)为羟基单体,采用种子乳液聚合、极性单体分段滴加工艺合成了高羟值(98.8 mgKOH/g)和高固含量(≥45.0%)的丙烯酸酯乳液,配制水性双组分丙烯酸酯聚氨酯涂料(2K-WPU),考查了羟值对聚合稳定性、乳液粒径和涂膜物理化学性能的影响,研究了水性双组分丙烯酸酯聚氨酯涂料合适的-NCO和-OH物质量的比.研究发现:羟值的提高会增加乳液聚合的凝胶率,降低单体的转化率,使乳液聚合稳定性下降,乳液粒径变大,分布变宽;涂膜硬度和交联度随羟值的增大而提高,涂膜光泽和耐介质性能分别在羟值为65.9 mgKOH/g和82.4 mgKOH/g时达到最佳;当n(-NCO)∶n(-OH)为1.5~1.8时,水性双组分丙烯酸酯聚氨酯涂膜的综合性能最佳.傅里叶红外光谱分析表明在涂膜形成过程中-NCO与-OH的固化反应完全需7 d,TGA分析了水性双组分聚氨酯涂膜的耐热性. 相似文献
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双组分水性聚氨酯涂料主要由水性羟基组分(A组分)和多异氰酸酯组分(B组分)构成。以丙烯酸分散体多元醇为A组分,以亲水改性HDI三聚体为B组分,将两者混合固化成膜,得到了双组分水性聚氨酯涂膜。在这一过程中,考察了A组分的组成和结构以及A、B组分的混合配比对最终涂膜性能的影响。结果表明:得到性能良好的双组分水性聚氨酯涂膜,适宜的工艺参数为:羟基含量4%~5%,中和度80%,多异氰酸酯固化剂与羟基树脂的n(—NCO)∶n(—OH)为1.0~1.2。最后将该涂膜与双组分溶剂型聚氨酯涂膜进行了性能比较,结果表明其综合性能接近相应的溶剂型涂膜,其VOC含量只有后者的36%,符合环保要求,因此具有广阔的应用前景。 相似文献
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UV固化超支化聚氨酯丙烯酸树脂的研究进展 总被引:1,自引:0,他引:1
超支化聚氨酯是一种新型的功能性树脂,UV固化超支化聚氨酯丙烯酸树脂作为一种新型的涂料成膜物质,具有固化速度快、涂膜性能好、环境污染小等优点,对制备环境友好、性能优异的产品以及用其改性普通的UV光固化树脂具有实际意义,展现出良好的发展前景。本文就国内外有关UV固化超支化聚氨酯丙烯酸树脂的制备方法、固化动力学和固化流变行为等方面的研究工作进行了综述,并介绍了UV固化超支化聚氨酯丙烯酸树脂在改善涂膜力学性能和阻尼性能等方面的应用研究现状,提出完善UV固化超支化聚氨酯丙烯酸树脂的基础研究和在此基础上的相关产品的开发将是今后研究的主要发展方向。 相似文献
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采用几种不同酸值和羟值的丙烯酸树脂与HDI多异氰酸酯制备双组分丙烯酸聚氨酯涂料,研究在高温施工环境下树脂酸值和羟值对双组分聚氨酯涂料适用性和施工性能的影响,同时还探讨了如何消除施工中涂膜的病态,设计了该环境下专用的稀释剂配方。 相似文献
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合成羟基丙烯酸类共聚物与环氧树脂冷混拼用作为漆基制漆,以聚氨酯交联固化,涂膜兼有丙烯酸树脂,环氧树脂和聚氨酯之优点。介绍了树脂合成工艺,油漆性能,并对三种成膜材料的组成进行了探讨。 相似文献
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用于裸塑料的快速固化丙烯酸聚氨酯涂料 总被引:1,自引:0,他引:1
于剑昆 《化学推进剂与高分子材料》2005,3(2):53
日本武藏涂料株式会社首次研制成功一种用于塑料的高性能双组分丙烯酸聚氨酯系涂料,据称其固化时间仅为现有制品的一半。现有的丙烯酸聚氨酯涂料强制干燥后,涂装件必须放置约1周,才能得到耐乙醇等的涂料性能,为此要求开发能生成高性能涂膜,具有优良耐乙醇性、硬度和耐磨性的涂料。 相似文献
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针对水性双组分聚氨酯涂料涂膜外观橘纹的问题,通过对涂膜的长波、短波、光泽等性能的表征,从树脂、流平剂、消泡剂和助溶剂因素研究分析了涂膜鲜映性的影响因素。结果表明:当树脂羟基含量达到3.0 mg KOH·g-1以后,树脂羟基含量高低对于涂膜鲜映性的影响很少,与树脂本身的通透性、与体系相容性等参数相关;不同类型的流平剂对涂膜鲜映性影响较大,丙烯酸类流平剂对长波改善较为明显;在消泡剂方面,有机硅类消泡剂对涂膜外观改善有明显作用;助溶剂的沸点、表面张力与水的相溶性参数直接影响涂膜的鲜映性。 相似文献
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Preparation and Characterization of Two-component Waterborne Poly-urethane Comprised of Water-soluble Acrylic Resin and HDI Biuret 总被引:12,自引:0,他引:12
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ZHOUXinhua 《中国化学工程学报》2006,14(1):99-104
A two-component waterborne polyurethane (2K-WPU) was prepared by mixing water-soluble acrylic resin and hexamethylene diisocyanate biuret, and then diluted for phase inversion with water. Compared with water-soluble acrylic resin, the phase inversion of 2K-WPU occurs at lower water content. It is indicated by TEM that 2K-WPU particles show a core-shell structure, in which HDI biuret is encapsulated by hydrophilic acrylic resin. 2K-WPU emulsion with HDI biuret has larger particle size and narrower distribution index, while for 2K-WPU emulsion with HDI isocyanurate, the latex not only has large particle size, but also has two-peak distribution. FTIR shows that the reaction between HDI biuret and acrylic resin can complete in 12h. In addition, studies on effect of composition of acrylic resin on performance of 2K-WPU show that narrowing the polar difference between water-soluble acrylic resin and HDI biuret and improving the miscibility of two components are the key to prepare the transparent and high gloss films with high crosslinking density. 相似文献
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氟改性双组分水性丙烯酸聚氨酯涂料性能研究 总被引:1,自引:0,他引:1
以甲基丙烯酸十二氟庚酯(DFMA)、丙烯酸(AA)、甲基丙烯酸羟乙酯(HEMA)、甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为原料,采用溶液聚合法合成了一系列氟含量不同的水性羟基丙烯酸树脂。将含氟水性羟基丙烯酸树脂、亲水性异氰酸酯固化剂和助剂混合制备氟改性双组分水性丙烯酸聚氨酯(2K—WPU)涂料。利用傅里叶变换红外光谱(FT-IR)对其结构进行了表征,并对涂料的接触角、吸水率和清漆性能分别进行了测试。结果表明,该水性树脂粒径在28.2~68.1nm之间,粒径分布均匀。当水性羟基丙烯酸树脂组成中DFMA质量分数从0增加至20%时,所制备氟改性2K-WPu涂料的水接触角从70.3。增大到97.6。,吸水率从11.4%降低至6.31%,涂膜的耐水性显著提高。清漆性能测试表明,所制氟改性2K.WPu的各项性能优异。 相似文献
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聚合方法对水性羟基丙烯酸树脂及相应2K-WPU性能的影响 总被引:1,自引:0,他引:1
分别通过溶液聚合、乳液聚合和两步聚合法制备了3种水性羟基丙烯酸树脂(PAS、PAE、PAT),采用傅里叶变换红外光谱(FT-IR)、动态光散射(DLS)和示差扫描量热法(DSC)对所合成树脂进行了表征。在无催化剂存在的条件下,分别将3种水性树脂与异氰酸酯固化剂Bayhydur XP 2655以及助剂混合得到双组分水性聚氨酯清漆,通过红外光谱对固化后清漆结构进行了表征,并对3种水性清漆的性能进行了研究。实验结果表明基于PAT的水性清漆综合性能较优。 相似文献
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阳离子型水性丙烯酸酯聚氨酯塑料涂料的研究 总被引:1,自引:0,他引:1
合成了阳离子型羟基丙烯酸酯树脂分散体(A组分),其与多异氰酸酯固化剂(B组分)配制的双组分水性聚氨酯涂料可用于ABS、PC/ABS、PC、PVC等塑料制件的表面涂装。研究了甲基丙烯酸-N,N-二甲氨基乙酯(DMAEMA)、丙烯酸羟乙酯(HEA)用量,硬单体甲基丙烯酸甲酯与软单体丙烯酸丁酯(MMA/BA)的质量比及A、B组分(NCO/OH)物质的量比对聚氨酯涂膜性能的影响,采用FT-IR和DSC对固化膜结构进行了表征。结果表明:DMAEMA用量为5%,HEA用量为15%,m(MMA)/m(BA)=2,n(NCO)/n(OH)=1.2~1.4可得到力学性能、耐水性、耐化学品性优秀的涂膜。 相似文献
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The effects of four kinds of hardener on the properties of castor oil (CO) based 2-package waterborne polyurethane (2K-WPU) wood coatings were examined. Modified castor oil (MCO) was prepared by transesterification of glycerol and CO at the molar ratio of 2.0. The waterborne polyurethane-dispersed polyol (PUDp), one component of the 2K-WPU, was synthesized from MCO, dimethylol propionic acid (DMPA) and isophorone diisocyanate (IPDI) by the acetone process to provide a prepolymer with a carboxyl and hydroxyl groups. Then the prepolymer was neutralized by triethylamine (TEA) and dispersed into water. After vacuum distillation to remove acetone, the PUDp was obtained and then mixed with four different hardeners: IPDI, hexamethylene diisocyanate (HDI), polyethylene glycol (PEG) modified PIPDI (polymeric IPDI) and PEG-modified PHDI (polymeric HDI). The NCO/OH molar ratio of 1.5 was used and a 2K-WPU coating was obtained. The results showed that the film of the 2K-WPU coatings obtained from IPDI hardener had excellent gloss and hardness. On the contrary, the film containing PEG-modified PIPDI hardener (PEG-PIPDI) had lower hardness and gloss but higher tensile strength. The film containing PEG-modified PHDI hardener (PEG-PHDI) showed the best elongation at break, abrasion resistance and impact resistance, though it had the worst hardness. The film with HDI hardener had the best hardness and highest tensile strength and superior water resistance among all the films with different hardeners, and it was suitable for wood coatings. 相似文献
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丙烯酸树脂改性的水性聚氨酯耐水性研究 总被引:5,自引:0,他引:5
本文研究了用丙烯酸树脂改性的水性聚氨酯耐水性特征。研究结果表明:通过聚氨酯与丙烯酸树脂机械共混能一定程度提高其耐水性;而实施化学共混即核-壳型聚合过程,形成的核-壳型聚合物具有二者树脂分子链相互贯穿与缠结的互穿网络结构,可以实现二者树脂的性能优势互补和耐水性能显著提高。 相似文献
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Alkoxysilane‐modified high solids hydroxyl acrylic polyurethane was prepared by solution polymerization. Its structure, surface, and thermal properties were investigated by 1H NMR, device of contact angle, thermo gravimetric analysis (TGA), atomic force microscopy (AFM), and X‐ray photoelectron spectroscopy (XPS). Research showed that alkoxysilane modified high solids hydroxyl acrylic polyurethane has superior properties that can be used for automotive paints. The contents of silicone in the alkoxysilane‐modified high solids hydroxyl acrylic polyurethane were 1.25, 1.5, 2, and 2.5 wt %. In this study, γ‐methacryloxypropyltrimethoxysilane (MPTS) was chosen as the modifier. Results showed that the contact angles of water and surface roughness on the film of MPTS modified high solids hydroxyl acrylic polyurethane increased, and thermal stability of the film at high temperatures improved with the increasing of the silicone content in the resins. MPTS modified high solids hydroxyl acrylic polyurethane with 2.5 wt % silicone content had better water resistance, better acid resistance, higher hardness, and excellent weatherability. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1866–1871, 2006 相似文献