轨道交通用丙烯酸聚氨酯半光面漆的研究

通过添加不同量的消光粉或滑石粉制备出不同配方的丙烯酸聚氨酯半光面漆,并研究其光泽稳定性;采用不同配比的高、低羟值丙烯酸树脂拼用制备了丙烯酸聚氨酯半光漆,并研究其光泽稳定性;研究了流平剂对丙烯酸聚氨酯半光漆漆膜光泽的影响。结果表明:采用消光粉消光的丙烯酸聚氨酯半光漆漆膜光泽不稳定;滑石粉对高羟值丙烯酸聚氨酯面漆漆膜消光效果不好,大量添加会降低漆膜的机械性能和耐候性能;流平剂对丙烯酸聚氨酯半光漆漆膜光泽影响轻微;高、低羟值丙烯酸树脂拼用的半光漆光泽最为稳定,且不牺牲其他性能,配方中填料添加量较少。     

水性双组分聚氨酯涂料性能研究--丙烯酸树脂分散体对涂膜性能的影响

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,制备水性双组分聚氨酯涂料,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100 mgKOH/g时性能较好.     

水性丙烯酸涂料光泽的影响因素研究

对水性丙烯酸涂料涂膜光泽的影响因素进行了研究。结果表明:水性丙烯酸乳液对水性丙烯酸涂料涂膜光泽影响很大。乳液的粒径越小,粒度分布越窄,涂膜的光泽就越高;反之,光泽越差。乳液用量增加,涂膜的孔隙率减小,光泽随之提高,水性丙烯酸乳液HD-1019C的用量为450 g时涂膜的光泽可达90%以上。拼用水性环氧酯树脂YGEE672A后,水性丙烯酸涂料的干燥性能有所降低但耐水性和光泽有明显的提高,水性环氧酯树脂适宜的用量为150～200g。颜料体积浓度(PVC)越大,涂膜的光泽越差,应控制在48%以下。增稠剂对水性丙烯酸涂料的光泽影响较大,非离子聚氨酯增稠剂AR-540在水性丙烯酸体系中有较好的表现,适宜的用量为涂料总量的1.0%。     

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

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。     

槽液稳定性好的高硬度丙烯酸阳极电泳涂料的研制

在混合溶剂中加入甲基丙烯酸、各种甲基丙烯酸酯单体以及引发剂AIBN和链转移剂DDM,在85℃下反应合成了丙烯酸树脂。分别研究了不同酸值和羟值的丙烯酸单体、不同Tg的丙烯酸树脂以及各种助溶剂和中和剂对漆膜性能的影响。获得了丙烯酸阳极电泳涂料的最佳配方:丙烯酸共聚树脂的酸值为65 mg KOH/g、羟值为69 mg KOH/g、Tg为20℃,溶剂是体积比为1∶1的丙二醇单甲醚和异丙醇的混合物,中和剂是二乙醇胺。该电泳涂料具有良好的槽液稳定性和起泡消泡性。制得的涂膜外观平整、丰满、光亮,厚度为18~20μm,硬度为5 H,冲击强度为500 N/cm2,附着力为1级,柔韧性为1 mm,耐烟雾实验超过400 h。     

汽车内饰抗刮亚黑聚氨酯涂料的研制

为解决亚黑 PU涂料抗刮性能差的问题,根据汽车内饰涂料的特点及要求,通过筛选不同的羟基丙烯酸树脂、添加剂,并对各物料配比进行合理化设计,最终采用了中羟丙烯酸树脂与改性的功能树脂混拼,并搭配消光粉、镁强粉、蜡粉、蜡浆等,研制了一种具有良好抗刮性能的汽车内饰单涂亚黑 PU涂料。对涂膜的综合性能进行了测试,结果显示：制备的单涂亚黑 PU涂料涂膜综合性能优良,在抗刮划方面的效果理想,适合作为汽车内饰用漆推广应用。     

氨基涂料系列产品开发与配方设计

试验选用异丁醇醚化的三聚氰胺甲醛树脂分别与醇酸树脂、环氧树脂和丙烯酸树脂进行复配制漆,对这3类氨基涂料综合性能进行了考察。试验表明,当与醇酸树脂复配时树脂配比为1∶3、溶剂用量在6%～10%时涂膜性能较好;与环氧树脂复配时树脂配比为3∶1时涂膜性能最佳,添加萘酸钙催干效果较好;与含羟基丙烯酸树脂复配时树脂配比为1∶3时涂膜性能最佳。     

快干汽车修补清漆的制备

从树脂合成、固化剂、催化剂等方面进行改善,制备的羟基丙烯酸树脂具有较好的干燥速度和优异的板面状态,经检测,在满足涂膜综合应用性能的前提下,能够使修补清漆喷涂后0.5 h即可达到不沾灰、不沾尘、光泽丰满、不失光的效果,在国内修补涂料市场发展前景广阔。     

汽车塑料零部件用水性双组分聚氨酯弹性涂料制备

研究了水性双组分聚氨酯塑料零部件弹性涂料的制备工艺,讨论了树脂分散体、亚光粉、成膜助溶剂、固化剂稀释溶剂对涂膜性能的影响。结果表明:当水性聚氨酯分散体与羟基丙烯酸乳液协同使用时,涂膜的柔韧性、抗划伤性及耐化学品性综合性能优异;当亚光粉粒径为4μm、添加量为6%时,涂料的分散性、贮存稳定性及涂膜亚光颗粒细腻度良好;当十二醇酯作为成膜助溶剂时,所得涂膜干燥速度及流平性皆好;当固化剂稀释溶剂为丙二醇二醋酸酯、稀释浓度为70%、固化剂添加比例n(—NCO)/n(—OH)为1.5时,涂膜硬度、柔弹性及耐溶剂擦拭等综合性能最佳。     

高温环境下施工双组分丙烯酸聚氨酯涂料配方设计及漆膜病态的解决方案

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。     

巴士客车用丙烯酸聚氨酯罩光清漆的制备

介绍了以聚酯树脂和特种助剂对罩光清漆进行改性,制得了适合巴士客车使用的丙烯酸聚氨酯罩光清漆。分析了聚酯树脂和特种助剂对罩光清漆的丰满度、抗划伤性能、流平性和施工性能的影响。结果表明当选用高固含、高羟基聚酯树脂对丙烯酸树脂进行改性时,涂料具有较好的丰满度和抗划伤性能;当流平剂选用丙烯酸类和有机硅类搭配使用时,可大大提高罩光清漆的流平性能;当触变剂BYK-410的用量为0.3%时,清漆一次涂装干膜60μm不流挂,当DBE慢干剂用量为2%时,涂料具有好的施工性能。     

影响聚氨酯亚光清漆涂膜光泽稳定性的因素

影响聚氨酯亚光清漆涂膜光泽度的因素是多种多样的,既有涂料配方的特殊性,也有涂装工艺的规范性,更有施工环境的差异性。本文系统研究了影响聚氨酯亚光清漆消光作用的环境因素、施工因素与配方因素等,探讨了各因素影响涂膜消光的机理,并全面总结了提高聚氨酯亚光清漆涂膜光泽稳定性的方法。     

Waterborne hybrid alkyd–acrylic dispersion: Optimization of the composition using mixture experimental designs

VOC-free waterborne hybrid alkyd–acrylic (50/50 wt/wt) dispersions were synthesized by melt condensation reactions between acrylic pre-polymers bearing carboxylic groups and medium-oil alkyd resins, followed by a self-emulsification through the neutralization of the carboxylic groups by an aqueous ammonia solution. A mixture experimental design was used to investigate how formulation components of the hybrid alkyd–acrylic resin affect the properties of the hybrid dispersion in terms of the viscosity of the dispersion, particle size, hydrolytic stability, and coating performance, namely gloss and film hardness. It was found that the content of ionizable monomers is the dominant factor controlling the particle size. This latter was shown to meaningfully affect the gloss of the coating after drying. The viscosity of the dispersion was mainly governed by the content of the soybean oil fatty acid which also controlled the hardness of the coating film after drying. An optimal composition that fits the requirement of paint formulation in terms of particle size, viscosity, hardness, and gloss was defined on the basis of the results of the mixture experimental design.     

聚氨酯涂料的配方设计及PVC计算

采用羟基丙烯酸树脂为成膜物质,钛白粉、超细硫酸钡为颜填料,配用合适的助剂和溶剂,制备了高光泽、耐候性优异及低成本的聚氨酯涂料。考察了颜基比(P/B)、填料、催化剂及紫外线吸收剂对漆膜性能的影响。通过单一颜料涂料体系的颜料体积浓度(PVC)的计算,推导出PVC的倒数与P/B的倒数呈一次线性函数关系。     

Preparation of amphiphilic acrylic acid copolymer and its application in humidity‐sensitive coatings

A new kind of water‐dispersed resin, amphiphilic acrylic acid copolymer resin was prepared by hydrophilic monomer, hydrophobic monomer, and functional monomer (diacetone acrylamide). The effect of acid value and diacetone acrylamide concentration on water solubility was investigated. It showed that the acid value should be greater than 100 mg KOH/g. The coating properties of the amphiphilic acrylic acid copolymer resin and its film were measured, which showed excellent properties in hardness, gloss, and water resistance. It was applied to prepare the humidity‐sensitive coatings. The water absorption of humidity‐sensitive coatings was 260%. It could increase indoor humidity or dehumidify in dry or moist environment. On the basis of scanning electron microscopy images, the mechanism of humidity‐sensitive activity was also discussed. The humidity‐sensitive exhibited humidity sensitivity and excellent humidity retention because fillers of porous structure combined with amphiphilic copolymer. It could be widely applied in indoor coating for controlling humidity. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Studies on Performance of Cured Water-Borne Melamine–Acrylic Emulsion Coatings

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.     

自交联型丙烯酸阴极电泳涂料树脂的合成

采用甲基丙烯酸二甲胺基乙酯(DMAEMA)、甲基丙烯酸β羟乙酯(HEMA)、N-羟甲基丙烯酰胺(NHMA)、甲基丙烯酸甲酯(MMA)、丙烯酸丁酯(BA)等单体合成了自交联型丙烯酸阴极电泳涂料,研究了影响树脂水溶性和漆膜性能的因素。实验结果表明,DMAEMA、HEMA、NHMA用量分别为单体用量的16%、15%、6%,引发剂偶氮二异丁腈(AIBN)的用量为单体用量的2%,合成反应2 h,电泳电压125 V时,可得到综合性能良好的高装饰性自交联型丙烯酸阴极电泳涂膜。电泳漆膜外观平整光亮,性能优良,膜厚可达22μm,光泽度(20°)可达123.9,适用于要求高装饰性表面的涂装。     

水性金属构件专用涂料的研制及其施工工艺

通过选用水性丙烯酸树脂与水性环氧树脂复配,研制了一种水性金属构件专用涂料。采用浸涂或喷淋的方式施工,涂膜均匀,表面平整光滑、硬度好、附着力强、防腐性好、关节活动性好、无漏涂现象,膜厚5～15μm的涂膜耐盐雾性可达48h。     

Synthesis and properties of hybrid alkyd–acrylic dispersions and their use in VOC-free waterborne coatings

Hybrid waterborne alkyd–acrylic dispersions with solid content of 40%, free from any surfactant and exempt of any organic solvent, were successfully synthesized by a melt co-condensation reaction between an acrylic prepolymer bearing carboxylic groups and a long-oil alkyd resin. Spontaneous emulsification of the ensuing hybrid resin was achieved by the addition of an aqueous ammonia solution that neutralized the carboxylic functions. The key role of the carboxylic groups on the stabilization process and on the storage stability of the dispersion was assessed and it was shown that the insertion of anhydride moieties within the acrylic prepolymer ensured the efficient coupling between the acrylic and the alkyd resin and prevented the phase separation. These dispersions are easy to implement and might be used to prepare high quality zero VOC coatings in terms of drying time, stability and gloss. The most stable dispersion was also used in the formulation of air-drying waterborne lacquers and their coating properties were evaluated.