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1.
采用甲基丙烯酸甲酯(MMA)与蓖麻油水性聚氨酯乳液共聚反应制备聚氨酯丙烯酸酯(PUA)复合乳液,研究了蓖麻油水性聚氨酯性能、MMA添加量、引发剂种类和聚合温度对PUA复合乳液及涂膜性能的影响,并应用傅里叶红外光谱(FTIR)测定反应产物的结构.研究发现,用外观半透明或微透明的PU-M分散液制备的PUA乳液及涂膜性能优良.油溶性引发剂(AIBN)比水溶性引发剂(K2S2O8)更适合本体系的乳液聚合.随着MMA含量增大,PUA复合乳液胶粒粒径增大,黏度减小,涂膜光泽度下降,机械性能变好,耐水性增加.合适的MMA含量为体系总固含量的20%~30%.提出了PUA复合乳液胶粒形成及粒径长大机理. 相似文献
2.
聚氨酯-丙烯酸酯复合乳液的合成与性能 总被引:15,自引:0,他引:15
采用甲基丙烯酸甲酯(MMA)与水性聚氨酯乳液共聚反应制备聚氨酯-丙烯酸酯(PUA)复合乳液,研究了MMA添加量、引发剂种类和聚合温度对PUA复合乳液及涂膜性能的影响,确定了PUA复合乳液合成的工艺参数。用傅立叶红外光谱(FTIR)测定反应产物的结构。研究发现油溶性引发剂比水溶性引发剂更适合PUA体系的乳液聚合。随着MMA添加量的增大,PUA复合乳液胶粒粒径增大,黏度减小,涂膜光泽度下降,机械性能增强,耐水性增加。 相似文献
3.
Jianhong Yang Qin Shen Fengqin Shen Jun Cai Wanghui Liu Ming Zhou 《Journal of Coatings Technology and Research》2018,15(4):819-830
Acrylate latices were prepared by seeded emulsion polymerization of methyl methacrylate (MMA) and butyl acrylate (BA) in presence of urushiol with multifunctional groups (0–6 wt%). The emulsion polymerization was strongly influenced by the urushiol content. With increasing urushiol content, the conversion rate of the monomers first increased then decreased, the stability of emulsion polymerization gradually declined, the average particle size of the latex increased from 115.9 to 175.3 nm, and a change from mono- to bimodal particle size distribution occurred. Interestingly, transmission electron microscopy (TEM) showed that some particles were connected by linear bridges in presence of urushiol. Based on results of 1H nuclear magnetic resonance (NMR) analysis, such formation of interparticle bridges is due to participation of urushiol in the emulsion polymerization of the acrylate monomers. The content of urushiol also affected the properties of latex films. With increasing urushiol content from 0 to 3 wt%, the adhesion, pencil hardness, and contact angle were markedly improved from grade 6 to grade 2, from B to 3H, and from 22° to 61°, respectively, due to formation of interparticle bridges. When the content of urushiol exceeded 3 wt%, the adhesion and pencil hardness remained unchanged, but the water contact angle markedly declined because of higher surface roughness of the latex film. Furthermore, addition of urushiol enhanced the thermal stability of the latex films. 相似文献
4.
Emulsion and miniemulsion copolymerizations were carried out with acrylic monomers (methyl methacrylate, butyl acrylate, and acrylic acid) in the presence of an alkyd resin. Poly(methyl methacrylate) was used as a hydrophobe or cosurfactant in the miniemulsion reactions. The results demonstrate that miniemulsion polymerization is the preferred process, probably because of mass transport limitations of the alkyd in the conventional emulsion polymerization reactions. The monomer emulsions prepared for the miniemulsion reactions were much more stable and the polymerizations were free of coagulum. Reaction rates, particle size characteristics, grafting efficiencies, and some film properties were measured. © 1996 John Wiley & Sons, Inc. 相似文献
5.
Xuesen Lv Pei Guo Haifeng Liu Li Cui Xuemin Cui 《Journal of Coatings Technology and Research》2018,15(4):867-874
A type of paraffin phase-change microcapsule for thermal insulation of exterior walls was prepared by in situ polymerization of low-softening-point paraffin (46°C) as core material and acrylic copolymer as shell. The surface morphology, phase-change thermal properties, and thermal stability were characterized by scanning electron microscopy, laser particle size distribution analysis, differential scanning calorimetry, and thermogravimetric analysis, respectively. The results showed that, for polymerization reaction temperature of 75°C and paraffin/acrylic copolymer mass ratio of 1.8, the microcapsules prepared at rotation speed of 1600 r/min with 8% emulsifiers were spherical particles with smooth surface and average particle size of 0.68 μm. The phase-change temperature and latent heat storage capacity of the microcapsules were 47.8°C and 174 J/g, respectively. The paraffin phase-change microcapsules obtained using the optimum synthesis condition were mixed in a metakaolin-based geopolymer coating at different proportions, and the thermal insulation ability of the resulting phase-change thermal energy storage coating characterized. 相似文献
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以水包油(O/W)型Pickering乳液为模板,经UV光聚合法制备复合壳层中空微胶囊,探究了乳化剂纳米粒子的加入方式、粒径和光敏低聚物PUA对微胶囊壳层的影响,并将微胶囊加入到树脂涂层中,探究微胶囊作为填料对涂层基本性能的影响。使用傅立叶变换红外光谱、扫描电镜、光学显微镜、热重等仪器对微胶囊结构进行表征,并对涂层性能进行了测试。结果表明:乳化剂SiO2-E纳米粒子加入到油相中制备得到的中空微球表面镶嵌有SiO2-E纳米粒子;乳化剂纳米粒子粒径的增加,影响中空微球的形貌但对尺寸无影响;当PUA的质量分数从10%增加到30%时,中空微胶囊表面分布的纳米粒子减少,断裂伸长率从11.1%增加至34.5%,而最大拉伸应力从21.5 MPa降低至12.1 MPa。中空微胶囊加入到涂料中,随中空微胶囊含量的增加,涂层的铅笔硬度提高且附着力良好。 相似文献
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Hideaki Kawahara Tokio Goto Kiyoshi Ohnishi Hironao Ogura Hiroyuki Kage Yoshizo Matsuno 《应用聚合物科学杂志》2001,81(1):128-133
Epoxy resin/acrylic composite latexes were prepared by miniemulsion polymerization. Epoxy resins have a functional epoxy group in them and excellent characteristics, such as heat resistance and good adhesion. Acrylic latexes have weather and water resistance. Combining the epoxy resin and the acrylic latex was an attempt to actualize these advantages. The miniemulsion polymerization method was effective in obtaining the composite latex. A less than 500‐nm droplet size for the monomer preemulsion was necessary to obtain the latex in a stable manner. Dimethylaminoethylmethacrylate and methacrylic acid as the reactive functional monomer with an epoxy group were introduced to the latexes. The effect of the polymerization method of these functional groups on the properties of latexes and their films was investigated. The latex prepared by the two‐stage polymerization method had good polymerization stability, storage stability, and solvent resistance. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 128–133, 2001 相似文献
8.
Silmar B. Barrios Jessica F. Petry Clemens K. Weiss Cesar L. Petzhold Katharina Landfester 《应用聚合物科学杂志》2014,131(15)
Waterborne acrylic resins with a solid content higher than 40 wt % were obtained by miniemulsion polymerization of methyl methacrylate, butyl acrylate, and acrylic acid using a hydrocarbon coumarone–indene resin (HCR) as osmotic agent. HCR is a cheap polymer widely used for coatings and pressure‐sensitive adhesives. The resin leads to a higher hydrophobicity for the acrylic latex film and acts as osmotic agent in miniemulsion polymerization preventing Ostwald ripening, leading to latexes with particle sizes, size distributions, and stability comparable to those obtained using n‐hexadecane as osmotic agent. However, the monomer conversion and molecular weight were lower, indicating the occurrence of a chain‐transfer reaction. Atomic force microscopy analysis demonstrated that a smooth film surface with phase‐separated morphology was formed when using HCR. Faster film hardness development was achieved with HCR comparing with hexadecane. Compared with market standard in a paint formulation, a similar performance was achieved. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40569. 相似文献
9.
L. Sowntharya S. Lavanya G. Ravi Chandra N.Y. Hebalkar R. Subasri 《Ceramics International》2012,38(5):4221-4228
Hybrid nanocomposite coatings derived from titanium tetraisopropoxide and epoxy or acrylic modified silanes were deposited on polycarbonate (PC) by dip coating employing various withdrawal speeds followed by ultraviolet and thermal curing. The effect of different organic functional groups in the precursors and ageing effect of these sols were systematically studied with respect to thickness, abrasion resistance, pencil scratch test, nanoindentation hardness and transmittance. The gels derived from the freshly prepared and aged sols were structurally characterized by FT-IR and TEM analysis. The viscosities of the sols were monitored with time. The change in viscosity is rapid for sol from epoxy modified silane. The thickness of the coatings increases with increase in viscosity in case of both the silane precursors. The scratch as well as abrasion resistance increases as a function of coating thickness. The pencil scratch hardness improves from 2B for the bare PC to a maximum of 3H for the coating obtained from an aged sol derived from epoxy modified silane. Also, the abrasion resistance of the coatings from same sol was maximum as evidenced by a <6% change in haze after 500 cycles, vis-a-vis 40% for the bare PC. The coatings from a freshly prepared sol of acrylic modified silane and titania showed the maximum nanoindentation hardness of 0.52 GPa, when compared to 0.23 GPa for the bare PC. 相似文献
10.
Fabrication and performance of the castor oil (CO)-based hyperbranched acrylate (C20AA) UV-curable coatings are highlighted in this work. Herein, C20AA was obtained through a facile reaction of a castor oil-based hyperbranched polyol (C20) with acrylic acid. FT-IR and 1H NMR spectra confirmed the synthesis of the target C20AA. Subsequently, the as-prepared C20AA was employed for crosslinking a commercialized linear polyurethane acrylate (PUA) UV-curable oligomer. Specifically, by varying the content of C20AA over the range of 0, 20, 40, and 60 wt%, a series of UV-curable coatings were prepared and coded as C20AA-0, C20AA-20, C20AA-40, and C20AA-60, respectively, which were further cured under UV irradiation. The effect of C20AA loadings on the UV-curing efficiency and final polymer performance were investigated. Consequently, the tensile strength, Shore D hardness, pencil hardness, gel content, water resistance, and glass-transition temperature of the UV-cured coatings were greatly improved upon the addition of C20AA. Impressively, with the incorporation of 40 wt% C20AA, the resultant UV-cured coating exhibited highest double bond conversion, superior chemical resistance, and good flexibility. Additionally, all of the coatings showed outstanding transparency and good surface microstructures. 相似文献
11.
丙烯酸树脂改性水性聚氨酯的结构与性能研究 总被引:3,自引:0,他引:3
采用丙烯酸树脂对水性聚氨酯进行改性,得到了共混改性(PU/PA)、共聚改性(PUA’)、接枝改性(PUA)3种丙烯酸改性水性聚氨酯聚合物。通过对改性聚氨酯乳液的激光粒度分析,乳胶膜的红外光谱、热分析、透明性、耐化学性及扫描电镜进行分析,结果表明:改性后的水性聚氨酯,各项性能均有不同程度的提高。在机械共混聚合物PU/PA体系中,聚氨酯分子链和丙烯酸树脂分子链间具有一定的相容性及共混性;在共聚反应聚合物PUA’、PUA体系中,聚氨酯分子链和丙烯酸树脂分子链形成核壳结构,且在PUA中,聚氨酯分子链和丙烯酸树脂分子链之间形成的化学键,可以有效的提高二者的相容性及共混程度。 相似文献
12.
《Journal of Adhesion Science and Technology》2013,27(8):883-892
In this study, water-borne coating formulations which could be cured quickly were prepared using acrylic emulsion as the major coating constituent and highly reactive melamine resin as curing agent, and further incorporating a variety of additives. Melamine and acrylic types, melamine/acrylic mass ratio in coating formulation, and curing temperature were found to influence the performance of cured coatings. When melamine resin etherified slightly with methanol was used as curing agent, melamine/acrylic mass ratio was 0.45 and the coating formulation was baked at 170°C for 30 s, it was observed that performance of cured coating was the best. FTIR was used to study molecular structural changes of coatings after curing, and to analyze the cure mechanism of the coating. DSC was used to study the range of temperature in which curing occurred. The water-borne coating prepared in this study could be cured quickly when it was applied on decorative paper surface and baked at high temperature. Performance properties of cured coatings were tested according to standard methods, it was observed that dry heat resistance, wet heat resistance, adhesion, pencil hardness, and stain resistance all met standard requirements. 相似文献
13.
Sharon Xudong Feng Mike Dvorchak Kevan E. Hudson Christine Renk Tammy Morgan Vic Stanislawczyk Francine Shuster Dick Todd Howard Bender Jim Papenfuss 《Journal of Coatings Technology》1999,71(899):51-57
Statistical methods were used to develop hydroxy functional acrylic emulsions for use with a water-dispersible polyisocyanate
crosslinker. The resulting two-component waterborne coating systems were optimized for kitchen cabinet and office furniture
applications. Key performance criteria included appearance and aesthetics, pot life, print and mar resistance, and chemical
resistance involving both Kitchen Cabinet Manufacturers’ Association (KCMA) and office furniture requirements. Statistical
analysis revealed several strong correlations between acrylic emulsion hydroxy level, particle size, composition Tg, polymerization process and wood coating performance. For example, smaller acrylic emulsion particle size was found to yield
many performance benefits with few detriments.
Coating formulation variables were also found to be significant. Ultimate coating hardness increased with water-dispersible
polyisocyanate level, yet early hardness readings correlated negatively with water-dispersible polyisocyanate level. Plasticization
and crosslinking effects were thought to be responsible. A higher ethylene glycol monbutyl ether (EB) coalescent level was
found to correlate negatively with coating hardness, suggesting a reaction between the EB hydroxyl group and the water-dispersible
polyisocyanate, resulting in plasticization of the coating.
Coatings and Colorants Div., 100 Bayer Rd., Pittsburgh, PA 15205-9741
Performance Materials Div., 9921 Brecksville Rd., Brecksville, OH 44141-3259. 相似文献
14.
《国际聚合物材料杂志》2012,61(7):397-401
A series of polymer/SiO2 organic-inorganic composite microspheres were successfully prepared through miniemulsion polymerization. A TEM study indicated that the composite microspheres had raspberry-like morphology and silica particles were successfully deposited onto the surfaces of organic polymer microspheres. The average particle size and the silica content of composite microspheres could range from 180 nm to 240 nm and 15 ~ 35 wt%, respectively. The influence of reaction conditions such as the amount of emulsifier, the sonification frequency and sonification time, the amount of silica sol, butyl acrylate (BA) on the particle size, silica content and morphology of composite microspheres have been studied. 相似文献
15.
聚氨酯-聚丙烯酸互穿网络聚合物乳液的合成 总被引:1,自引:0,他引:1
以甲苯二异氰酸酯、聚醚多元醇、二羟甲基丙酸、1,4 丁二醇、甲基丙烯酸甲酯、甲基丙烯酸丁酯等为原料,采用原位乳液聚合工艺合成聚氨酯聚丙烯酸酯乳液.研究了单体含量对乳液及胶膜性能的影响.实验结果表明:随着乙烯基单体含量的增加,乳液稳定性下降;胶膜的断裂伸长率降低,硬度和耐水性增加.当乙烯基单体的质量分数为35%时,乳液的稳定性大于365 d,胶膜的断裂伸长率为482%,摆杆硬度为0.68,吸水率为18.7%.红外光谱分析表明合成了聚氨酯聚丙烯酸酯. 相似文献
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Sol-Gel法制备光固化纳米复合涂料的应用性能 总被引:1,自引:0,他引:1
运用紫外光固化技术与溶胶-凝胶(Sol-Gel)法制备紫外光固化纳米复合涂料,考察了SiO2含量及有机树脂结构对涂膜性能的影响.结果表明复合涂料中纳米颗粒具有良好的分散性,并在其表面形成良好的界面结合层;纳米SiO2的加入可以改善涂膜的硬度、附着力和抗冲性能.用该方法得到的EA/PUA纳米复合涂料光固化后涂膜具有优良的综合性能. 相似文献