水性聚氨酯的改性研究

分别采用丙烯酸酯、环氧树脂合成2种不同的改性水性聚氨酯,比较了改性前后及2种不同的改性水性聚氨酯在乳液、涂膜性能及粘接性能方面的差异。结果表明,改性后的水性聚氨酯综合性能明显提高,其中环氧树脂改性水性聚氨酯(EPU)在固化交联后涂膜的耐水、耐溶剂及力学性能又明显好于丙烯酸酯改性水性聚氨酯(PUA),其粘接强度与溶剂型聚氨酯相当;而采用丙烯酸酯改性的水性聚氨酯PUA乳液稳定性好于EPU乳液。     

丙烯酸酯改性水性聚氨酯树脂合成工艺的研究

以异氰酸酯、聚醚多元醇及二羟甲基丙酸为主要原料,合成了水性聚氨酯预聚体(PU),并且经过扩链、交联、丙烯酸酯复合改性等反应制备了丙烯酸酯改性水性聚氨酯树脂(PUA)。结果表明:对水性聚氨酯进行扩链、交联及丙烯酸酯复合改性,可以使两者优异的性能有机地结合起来,能显著提高水性聚氨酯的拉伸强度、硬度、耐磨性、耐水耐醇性,从而使水性PUA分散乳液胶膜的性能得到明显改善,以满足水性PUA木器漆用的要求。     

丙烯酸酯改性水性聚氨酯的研究进展

介绍了丙烯酸酯改性水性聚氨酯乳液(PUA)的制备方法,其中包括乳液型丙烯酸酯改性水性聚氨酯、单体丙烯酸酯改性水性聚氨酯、溶剂型丙烯酸酯低聚物改性水性聚氨酯,指出了各改性方法的优缺点;概述了国内外的研究现状,对丙烯酸酯改性水性聚氨酯前景进行了展望。     

丙烯酸酯改性水性聚氨酯乳液的制备及性能研究

采用物理共混和核-壳聚合法制备了丙烯酸酯改性水性聚氨酯(PU/PA,PUA)乳液,并对不同改性方法制得的乳液进行了研究。通过红外(FTIR)、透射电镜(TEM)、差示扫描量热(DSC)、热重分析(TGA)、耐水性和力学性能测试等研究了丙烯酸酯改性聚氨酯乳液及涂膜的结构与性能。结果表明具有核-壳结构的PUA乳液涂膜耐水性、耐热性和固含量较水性聚氨酯(PU)有明显的提高,力学性能稍有下降;PUA综合性能优于PU/PA。     

丙烯酸酯改性水性聚氨酯皮革涂饰剂研究进展

综述了近年来丙烯酸酯改性水性聚氨酯(PUA)皮革涂饰剂的改性方法,包括共混交联法、溶液聚合法、种子乳液聚合法和互穿网络聚合法。讨论了PUA复合乳液及漆膜结构与性能的关系,提出了水性皮革涂饰剂的发展趋势。     

丙烯酸酯对水性聚氨酯胶粘剂的改性研究

用自乳化的方法制备水性聚氨酯(PU)乳液,然后用丙烯酸酯进行改性,制备出水性聚氨酯和丙烯酸酯共聚乳液(PUA),并把聚丙烯酸酯(PA)乳液与PU乳液不同比例共混。考查了共聚型和共混型PUA乳液胶膜的吸水性、热行为、黏度、T型剥离强度。结果表明,在复合薄膜应用方面,共聚型PUA乳液的性能优于共混型PUA乳液。     

含氟水性PUA涂饰剂在PU合成革中的应用

采用含氟水性丙烯酸酯改性聚氨酯(PUA)作为合成革表面的涂饰剂,利用干法转移涂层和辊涂处理两种工艺方法分别制备了含氟水性PUA合成革,探讨了涂膜表面的性能.实验表明,含氟水性PUA的涂膜表面具有良好的剥离负荷和撕裂负荷及耐溶剂性;耐磨、耐水解性能与传统溶剂型聚氨酯表面涂饰剂相近.这不仅能环保、洁净生产,而且对合成革用聚氨酯从溶剂型向水性的变革具有现实意义.     

端羟基含氟丙烯酸酯接枝改性水性聚氨酯的性能研究

利用不同相对分子质量的端羟基含氟丙烯酸酯(FA)大分子改性水性聚氨酯得到一系列含氟丙烯酸酯改性水性聚氨酯(PUA)乳液.通过傅里叶红外光谱(IR)和透射电镜(TEM)分别表征了聚合物结构和聚合物乳液胶粒形态,通过吸水率、接触角,差示扫描量热(DSC),热重(TG)和拉伸强度测试研究了乳胶膜的性能.结果显示,PUA在耐水性、耐热性和力学性能等方面都有明显的提高.     

聚氨酯/丙烯酸酯复合乳液

<正>近年来,许多研究者利用聚氨酯(PU)乳液和丙烯酸酯(PA)乳液共聚具有性能互补的作用,制备了聚氨酯/丙烯酸酯(PUA)复合乳液。虽然,PUA复合乳液较单一乳液性能好,但是其涂膜的硬度、耐水性和耐化学品性还难以满足高档水性木器涂料的要求。     

UV固化聚氨酯丙烯酸酯涂料的研究进展

简要介绍了UV(紫外光)固化涂料的发展历程,阐述了PUA(聚氨酯丙烯酸酯)的合成机制及原料选择;重点综述了3种新型UV固化涂料[如WPUA(水性PUA)、双重固化型PUA和改性PUA等]的研究进展,提出了目前UV固化PUA涂料所存在的不足之处及解决办法。最后对UV固化PUA涂料的发展方向及应用前景进行了展望。     

不同官能度水性聚氨酯丙烯酸酯的合成及性能

以丙烯酸羟乙酯与季戊四醇三丙烯酸酯作为封端剂,分别合成了二官能度水性聚氨酯丙烯酸酯(WPUA2)和六官能度的水性聚氨酯丙烯酸酯(WPUA6),并用红外光谱、粒径仪、热重分析对合成产物结构和性能进行表征。研究表明,相比于使用低官能度WPUA2紫外光固化所得聚氨酯丙烯酸酯(PUA)涂膜,加入单体或使用多官能度WPUA6,都可使PUA固化膜凝胶率提高20%以上,吸水率降低30%;质量损失10%,分解温度增大82℃。提高预聚物官能度可有效提高涂膜交联密度和耐热性能,并具有与加入活性单体相似的应用效果。     

多官能度扩链剂对水性光敏聚氨酯丙烯酸酯性能的影响

用IPDI、DMPA、PMTG（1000）、HEMA分别合成非扩链型和扩链型光敏聚氨酯丙烯酸酯（PUA）水分散液。通过红外光谱（FTIR）和动态热力学分析测试仪（DMA）对非扩链型与扩链型聚氨酯丙烯酸酯的结构和热力学性能进行了表征比较,同时从黏度、光固化速率、耐溶剂性、附着力、硬度和吸水性等方面对两种PUA乳液（涂膜）性能做了比较。研究结果表明：加入扩链剂丙三醇合成的聚氨酯丙烯酸酯树脂不仅涂膜的硬度大大地增强,而且亲水性、光固化速度和玻璃化转变温度（从-54．02℃提高到-37．78℃）也明显提高。     

丙烯酸酯改性非离子型水性聚氨酯的合成及性能

以异佛尔酮二异氰酸酯(IPDI)、聚氧化丙烯二醇(N-210)、聚氧化乙烯二醇(PEG)等为基本原料,丙烯酸羟乙酯(HEA)为封端剂,合成了非离子型双键封端水性聚氨酯(HPU)自乳化乳液,然后与甲基丙烯酸甲酯(MMA)及丙烯酸丁酯(BA)进行自由基聚合,得到丙烯酸酯改性非离子型水性聚氨酯(PUA)乳液.对这种材料进行了耐水性、粒径及热力学等方面的测试,结果表明:PUA乳液粒子有明显核壳结构,乳液的平均粒径增大;胶膜耐水性随着HPU添加量的提高而降低,胶膜的耐热性有明显提高.     

A Strategy for Preparation of Anionic Polyurethane/Acrylate Emulsions

In this article we proposed a new strategy for preparation of polyurethane/acrylate (PUA) hybrid emulsions. In the preparation of the polyurethane dispersion, methyl methacrylate (MMA) was used as the reactive solvent to reduce the viscosity of the reaction mixture, and 2-(Dimethylamino)ethyl methacrylate (DMEMA) as the reactive neutralizer. We then let MMA and DMEMA undergo further polymerization to form PUA hybrid emulsions. The morphology of the PUA hybrid emulsions was characterized by transmission electron microscopy (TEM) and dynamic light scattering (DLS). The structures of the waterborne polyurethanes (WPU) and PUA hybrid emulsions were characterized by Fourier transform infrared spectrometer (FTIR) and contact angle measurements.     

Preparation,mechanical properties of waterborne polyurethane and crosslinked polyurethane‐acrylate composite

The waterborne polyurethane (PU) prepolymer was first prepared based on isophorone diisocyanate, polyether polyol (NJ‐210), dimethylol propionic acid (DMPA), and hydroxyethyl methyl acrylate via in situ method. The crosslinked waterborne polyurethane‐acrylate (PUA) dispersions were prepared with the different functional crosslinkers. The chemical structures, optical transparency, and thermal properties of PU and PUA were confirmed by Fourier transform infrared spectrometry, ultraviolet–visible spectrophotometry, and differential scanning calorimetry. Some physical properties of the aqueous dispersions such as viscosity, particle size, and surface tension were measured. Some mechanical performances and solvent resistance of PUA films were systemically investigated. The experimental results showed that the particle sizes of the crosslinked PUA aqueous dispersions were larger than the PU and increased from 57.3 to 254.4 nm. When the ratios of BA/St, BA/TPGDA, and BA/TMPTA were 70/30, PUA films exhibited excellent comprehensive mechanical properties. The tensile strength and elongation at break of the film were 2.17 MPa and 197.19%. When the ratio of BA/St was 30/70, the film had excellent water resistance and was only 6.47%. The obtained PUA composites have great potential application such as coatings, leather finishing, adhesives, sealants, plastic coatings, and wood finishes. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Waterborne Polyurethane-Acrylate Containing Different Polyether Polyols: Preparation and Properties

The waterborne polyurethane–acrylate (PUA) was prepared based on isophorone diisocyanate, polyether polyol, dimethylol propionic acid, hydroxyethyl methyl acrylate, butyl acrylate (BA) and styrene (St). Fourier transform infrared spectrometry (FT-IR), Ultraviolet-visible spectrophotometry (UV-Vis) and Differential scanning calorimetry (DSC) were employed to investigate the structures, optical transparency and thermal properties. Some physical properties of the aqueous dispersions such as viscosity, particle size and surface tension were measured. Some mechanical performances and solvent resistance of films were investigated. When the ratio of the BA/St was 30/70, the films had excellent water and alkali resistances. The obtained PUA composites have great potential application such as coatings, leather finishing, adhesives, sealants, plastic coatings and wood finishes.     

Preparation and properties of UV‐curable waterborne polyurethane–acrylate emulsion

Polyurethane–acrylate oligomer terminated with multiple unsaturated bonds was prepared using isophorone diisocyanate, (IPDI), methylene diphenyl diisocyanate, and polyols as monomers, using 2,2‐dimethylol propionic acid as hydrophilic chain extender, together with pentaerythritol triacrylate (PETA) as end‐capper. The UV‐curable waterborne polyurethane–acrylate (UV‐WPUA) composite emulsion was obtained by mixing the PUA oligomer with certain content of reactive diluents and then dispersing the mixture in water. The molecular structure of the polyurethane prepolymer, PUA oligomer, and UV‐cured polymer was investigated by Fourier transform infrared spectroscopy. The influence of the composition and content of the diluents and end‐capper on UV‐WPUA properties, including the emulsion stability, thermal property, water resistance, adhesion, hardness, glossiness of polymer film were studied. The results show that the WPUA emulsion has excellent stability, and the UV‐cured film features good hardness and remarkable water resistance when PETA is used as end‐capper and the end‐capping ratio of the polyurethane prepolymer is 70% and dipentaerythritol hexaacylate/dipropylene glycol diacrylate (mass ratio 1:1) is used as diluent. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45208.     

聚丙烯酸酯改性聚氨酯复合乳液研究进展

总结了聚丙烯酸酯改性聚氨酯(PUA)复合乳液(包括PUA共混乳液、PUA共聚乳液、PUA核壳结构乳液、PUA互穿网络乳液)的制备方法和性能特点,详细介绍了近年来PUA复合乳液的新进展,并对PUA复合乳液的发展作了一些展望。     

阴离子改性PUA紫外光固化胶粘剂的制备及性能

以异佛尔酮二异氰酸酯(IPDI)、二羟甲基丁酸(DMBA)和聚四氢呋喃醚二醇(PTMG)等为主要原料,制得聚氨酯(PU)预聚体;然后将其与丙烯酸羟乙酯(HEA)反应,制得HEA封端的聚氨酯丙烯酸酯(PUA)预聚体;最后在PUA预聚体中加入中和剂等助剂,制备出阴离子改性PUA紫外光(UV)固化胶粘剂。研究结果表明:当w(DMBA中-COOH)=1.2%(相对于PU预聚体质量而言)、中和度=n(中和剂)∶n(DMBA)=80%、以PTMG为多元醇且偶联剂采用预处理法加入时,相应的阴离子改性PUA型UV固化胶粘剂的耐水性、粘接强度和耐久性俱佳。