环氧丙烯酸酯改性光固化水性聚氨酯的合成及性能研究

采用环氧丙烯酸酯（PPG-EA）、甲苯-2,4-二异氰酸酯（TDI）、聚丙二醇（PPG）、二羟甲基丙酸（DM-PA）和丙烯酸羟乙酯（HEA）等制备了环氧丙烯酸酯改性光固化水性聚氨酯乳液（WPU）;研究了改性环氧丙烯酸酯用量、DMPA用量、n（—NCO）∶n（—OH）对乳液及涂膜性能的影响。结果表明：通过环氧丙烯酸酯改性的水性聚氨酯涂膜具有硬度高、耐水性和力学性能好的特点,并且克服了环氧树脂直接用于水性聚氨酯改性制备的乳液贮存稳定性差的不足。当改性环氧丙烯酸酯用量为6%-10%、DMPA用量为5.5%-7.5%、n（—NCO）∶n（—OH）为1.3-1.4时,UV固化水性聚氨酯乳液的综合性能较好。     

含交联结构聚醚型水性聚氨酯/丙烯酸酯的制备及性能

以聚醚二元醇GE-210为水性聚氨酯软段,二苯基甲烷二异氰酸酯、二羟甲基丙酸为硬段,三羟甲基丙烷为交联剂,通过原位聚合法制备了具有良好分散性的丙烯酸酯改性的阴离子水性聚氨酯分散液。研究了改性分散液及其成膜后的各项性能。测试结果表明,加入交联剂后,水性T-PUA分散液成膜后的耐水性和力学性能得到改善。其交联剂用量为0.75时,各项性能达到最佳。     

聚氨酯改性丙烯酸酯水性塑／塑复膜胶的研制

通过种子乳液聚合和单体预乳化工艺制备了一种塑／塑聚氨酯改性丙烯酸酯乳液复膜胶（GH-5142）。研究了聚氨酯加入工艺、丙烯酸酯单体类型、配比、乳化剂体系等对乳液性能的影响。实验结果表明,聚氨酯占乳液总量的2％,软硬单体质量比为1．5,乳化剂用量15％-2．0％,所得复膜胶性能较佳。     

硅烷偶联剂对光固化PUA/SiO2杂化涂料的改性研究

研究溶胶-凝胶法制备聚氨酯丙烯酸酯（PUA）/纳米二氧化硅（SiO2）复合涂料中加入硅烷偶联剂进行原位改性的作用机理,以期得到性能优良的有机-无机杂化纳米复合涂料。考察了硅烷偶联剂用量的变化对聚氨酯丙烯酸酯涂料性能的影响。结果表明,用硅烷偶联剂对溶胶-凝胶法制备的纳米二氧化硅进行改性,能够实现纳米颗粒的均匀分散,并在其表面形成良好的界面结合层;且适量的硅烷偶联剂的加入使聚氨酯丙烯酸酯涂料显示出优良的机械性能,表现出纳米材料特有的既增强又增韧特性,尤其是耐磨性能可以提高7倍。     

低温柔韧型高硬度水性聚氨酯分散体的合成与性能研究

制备了具有核壳结构的水性聚氨酯-丙烯酸酯（WPUA）复合分散体。研究了NCO／OH摩尔比、醇扩链剂、亲水性扩链剂、E-20、MMA等对分散体及涂膜性能的影响，从而确定了最佳合成配方，获得了低温成膜性好、贮存稳定性好、高硬度、耐水性佳的水性聚氨酯分散体及其涂料。     

紫外光固化环氧-丙烯酸酯/聚氨酯-丙烯酸酯复合型水性涂料的研制

制备了可反应性的阴离子型聚氨酯-丙烯酸酯，并用其作为乳化剂制成了可紫外光固化的水性环氧-丙烯酸酯／聚氨酯-丙烯酸酯复合型水性涂料。讨论了聚氨酯-丙烯酸酯的乳化机理，及其对环氧-丙烯酸酯水分散体系稳定性及涂膜性能的影响。     

水性双组分聚氨酯用丙烯酸酯分散体的合成

采用溶液聚合法合成了水性双组分聚氨酯用丙烯酸酯分散体。系统地研究了溶剂种类、聚合温度、引发剂种类及用量、链转移剂用量对丙烯酸酯多元醇分散体性能的影响,确定了制备低黏度丙烯酸分散体的合成工艺。     

聚氨酯树脂及其涂料

201312005高羟基含量的水性丙烯酸酯聚合物分散体的制备及其在聚氨酯涂料中的应用：W02013-92807[同际专利申请,英]／德国BayerIntellectualPropertyGmbH（Schrinner,MarcClaudius等）．-2013．06.27．-22页．-2011／195286（2011．12．22）：IPCC08F283／02     

微小乳液聚合制备丙烯酸酯杂化聚氨酯分散液

微小乳液聚合工艺技术在25~30年前即已问世,但用于丙烯酸酯杂化聚氨酯分散液的制备仅有10年历史。用该工艺技术可有效制得稳定的纳米级丙烯酸酯杂化聚氨酯分散液,其性能独特。本文阐述了微小乳液聚合工艺的原理、影响因素、存在问题和解决措施,并以实例说明之。     

聚氨酯丙烯酸酯/环氧丙烯酸酯分散体系的制备

用水性聚氨酯丙烯酸酯改性环氧丙烯酸酯,制备了聚氨酯丙烯酸酯/环氧丙烯酸酯分散体系。随着分散体中聚氨酯丙烯酸酯浓度的增加,体系稳定性增加,当其浓度达到30%时,可制得稳定的分散体系。这种分散体系可作为一种紫外光固化水性涂料,其涂膜的耐磨性、柔韧性都比环氧丙烯酸酯涂膜增强,而硬度变化不大。     

Effect of annealing on the properties of waterborne polyurethane adhesive containing urethane-based thickener

Different amounts of hydrophobically modified ethoxylated urethane-based thickener (HEUR) were added to improve the rheology of waterborne polyurethane adhesives. The thickened solid adhesive films were thermally annealed and characterised by IR spectroscopy, plate–plate rheology, dynamic mechanical thermal analysis (DMTA), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Hydrogen bonds played a key role in the thickening mechanism of polyurethane dispersions containing urethane-based thickener, along with ionic adsorption and micelles formation between hydrophobic groups. The adhesion properties were measured from T-peel test of leather/polyurethane adhesive/vulcanised styrene-butadiene rubber joints. Optimal results were obtained when water in the waterborne polyurethane adhesive (just before joint formation) was removed under open air, while forced air drying impeded the complete removal of water. On the other hand, the thermal annealing did not greatly affect the rheological and thermal properties of the thickened polyurethanes.     

水基环氧胶粘剂的制备及应用

介绍合成反应性乳化剂的技术路线、制备水基环氧树脂乳液的方法及水基环氧胶粘剂配方和应用方面的新进展。     

OPP膜用聚氨酯复合粘合剂的研究

采用丙酮法制备水性聚氨酯树脂,再复配聚醋酸乙烯酯乳液和松香乳液,提高了水性聚氨酯树脂粘合剂与0PP膜的粘合性。研究了粘合剂组成、烘干时间对0PP膜粘合性的影响,最后进行了优化正交实验。优化结果表明,当聚氨酯与聚醋酸乙烯酯乳液、松香乳液的配比（质量比）为11：9：3,干燥温度60℃,干燥时间为60s时,聚氨酯复合胶粘剂的力学性能较好,其抗拉强度为12．1N·mm^-2以。     

Waterborne Coatings Based on Renewable Oil Resources: an Overview

Polyurethane dispersions are gaining in importance due to their environmentally friendly coating system, versatile coating properties and ease of application. An enormous amount of research is focused on waterborne coatings such as waterborne alkyds, water-reducible alkyds, alkyd–acrylic hybrids, oil modified polyurethane dispersions and their composite latexes. This review gives a comprehensive compilation of recent studies on the synthesis and applications of waterborne coatings. The article specifically covers all of the research work carried out in the field of waterborne alkyd–acrylics, polyurethane dispersions and their hybrid latexes systematically.     

Synthesis and Properties of Aqueous Polyurethane/Polytert-butylacrylate Hybrid Dispersions

Aqueous polyurethane/polytert-butylacrylate (PU/Pt-BA) hybrid dispersions were prepared by polymerizing tert-butyl acrylate monomers that were emulsified by the waterborne polyurethane dispersions. The waterborne polyurethane dispersions, which contained no volatile solvent, were prepared by the prepolymer mixing process. The structure characteristics and properties of the hybrid dispersions were studied. A particle sizer and a viscometer were used to examine the physical characteristics of the dispersions. A Fourier transform infrared spectrophotometer and a gel permeation chromatograph were used to examine the structure of the hybrid composites. The thermal and mechanical properties were examined by a dynamic mechanical analyzer, a thermogravimetric analyzer, and an abrasion resistance tester. When the amount of ionic PU emulsifiers maintains constant, the average particle diameter and viscosity of the PU/Pt-BA hybrid dispersion become larger as more t-BA monomer was added and polymerized. As compared to the pure PU and Pt-BA polymers, the shifting of two T_gs in the composite toward each other may imply the improved compatibility between PU and Pt-BA through the hybridization process used in this study. The Pt-BA enhances the thermal and abrasion resistances of the PU/Pt-BA composites.     

Anionomeric waterborne poly(urethane semicarbazide) dispersions and their adhesive properties

Aqueous polyurethane dispersions were prepared from isocyanate‐terminated ionic polyurethane prepolymers by chain extension with dihydrazides. These water‐borne dispersions had excellent adhesive properties and were used to bond leather and canvas. The base polymers were varied with respect to (1) the ionic content with the same chain extender and (2) the nature of the chain extender with the ionic content kept constant. Studies on the particle size and viscosity revealed that the ionic content had an influence on the aforementioned properties: the particle size decreased and the viscosity increased with increasing ionic content. The polarity of the films cast from the dispersions were determined with contact‐angle measurements: hydrophilic character was exhibited by all the compositions. X‐ray studies revealed that the increase in the ionic content led to increasing intensities of the diffraction peaks due to increased secondary forces of bonding. The tensile strength measurements showed that the films were highly elastomeric and had good mechanical strength, which varied with the composition. A shear strength and peel strength analysis of specimens obtained through the bonding of leather to leather, leather to canvas, and canvas to canvas revealed that the waterborne dispersions were excellent adhesives for bonding leather surfaces. Thus, a very efficient, ecofriendly waterborne dispersion of polyurethane that could find applications in bonding leather in the footwear industry was prepared successfully. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

MMA/BA共聚物改性的水性聚氨酯的合成与表征

以1, 4-丁二醇 (BDO)、二羟甲基丙酸 (DMPA) 和己二酸二酰肼 (ADH) 为扩链剂，以甲基丙烯酸甲酯 (MMA) 和丙烯酸丁酯 (BA) 改性聚氨酯 (PU)，得聚氨酯-丙烯酸酯复合乳液 (PUA).研究了BA和二丙酮丙烯酰胺 (DAAM) 对乳液及膜性能和粘接性能的影响，并用傅立叶红外光谱 (FTIR)仪对PUA复合乳液进行了结构表征.实验结果表明当BA含量为4.0%～6.0%，DAAM含量为2.0%～3.0%时，乳液和膜性能较好，黏度性能较佳.用该乳液配制的胶黏剂对木材有很好的粘接性能.     

脂肪族水性聚氨酯脲的改性研究

采用原位聚合法,通过聚醚多元醇、异佛尔酮二异氰酸酯和二羟甲基丙酸反应合成聚氨酯预聚体,以有机硅单体和乙二胺为扩链剂,得到有机硅改性的脂肪族水性聚氨酯脲分散液.改性后的水分散液呈蓝光透明或乳白色,且稳定性良好.与未改性聚氨酯脲相比,改性后聚氨酯脲水分散液的粒径有所增大,但粒径分布基本不变.改性水分散液成膜后的热稳定和冻融...     

PU/PA纳米粒子改性酚醛树脂胶粘剂的研究

采用自乳化法制备PU/PA纳米粒子,并对酚醛树脂进行增韧改性.考查了丙烯酸酯单体种类、用量以及环氧树脂用量对改性酚醛树脂粘接性能的影响.借助TG、DSC、SEM和TEM对改性酚醛树脂体系的耐热性能、固化反应和微观形态进行了表征.结果表明,PU/PA纳米粒子的加入使酚醛树脂的常温和高温粘接强度显著增加,提高了酚醛树脂的固...     

Incidence of the polyol nature in waterborne polyurethane dispersions on their performance as coatings on stainless steel

Three waterborne polyurethane dispersions derived from polyester, polyether and polycarbonate diols with molecular weight of 1000 Da were synthesized by the acetone method and used as coatings on stainless steel 304 plates. The properties of the dispersions and the polyurethane films were influenced by the polyol nature. The polyurethanes obtained with polyether or polyester showed higher degree of phase separation between the soft and the hard segment. The higher adhesive strength under shear stresses was obtained in the joints produced with the waterborne dispersion obtained with polycarbonate diol. The properties of the polyurethane coating obtained with polycarbonate diol on stainless steel 304 were significantly higher as compared with the others. Improved performance of coatings obtained with polycarbonate diol was ascribed to the higher polarity of the carbonate groups that contributed to additional hydrogen bond formation between soft segments with respect to those obtained with polyether or polyester