Effect of particle size distribution on the performance of two-component water-reducible acrylic polyurethane coatings using tertiary polyisocyanate crosslinkers

A two-component waterborne polyurethane system with a 250 g/l VOC has been formulated to meet the performance requirements of the automotive refinish market. This paper discusses an experimental study to develop a two-component water-reducible polyurethane coating using a tertiary aliphatic polyisocyanate crosslinker with dry times, appearance, and reactivity equivalent to a two-component solventborne system. The effects of acrylic polyol monomer composition, glass transition temperature (T_g), and hydroxyl concentration on drytime and ambient cure film performance have been determined. The effects of particle size distribution of the formulated coating on performance were examined. It was found that smaller particle size provides overall improved film properties, i.e., faster dry time, increased hardness, and faster development of solvent resistance. The relationships of both acrylic polyol composition and formulation variables on the particle size distribution are discussed. Presented at 76th Annual Meeting of FSCT in New Orleans, LA, on Oct. 11–16, 1998. 1937 West Main Street, Stamford, CT 06904.     

溶解度参数在研制高性能丙烯酸聚氨酯涂料中的应用

本文采用革团贡献方法估算了双组份涂料中丙烯酸聚合物及固化剂HDI缩二毛的三维溶解度参数,并以此为基础选择了体系合适的溶剂：讨论了涂料成膜组份之间的相容性,分析了“雾影”的成因及消除“雾影”的方法,本实验将溶解度参数作为丙烯酸聚合物及其涂料配方设计的一项重要参数,并在此基础上制得了性能优良的丙烯酸聚氨酯涂料。     

双组分快干耐划伤聚氨酯涂料的制备

以丙烯酸树脂和高丁酰基含量醋丁纤维素(CAB)为成膜物质,TDI型多异氰酸酯为固化剂,制备了一种快干耐划伤双组分聚氨酯涂料。研究表明,醋丁纤维素的加入有助于提高涂料的硬干速率,在该涂料体系中添加漆料总量2%的玻璃粉和3%的醋丁纤维素可将漆膜的硬干时间缩短至5 min以内。各项性能测试表明,该涂料具有固化温度低,硬干时间短,耐划伤效果好,耐腐蚀性能优异等优点,适用于内含塑料件或液压油,需人工实现喷涂面翻转的工件的涂装。文章简要讨论了该涂料所使用原材料的选用原则。     

EIS study on failure process of two polyurethane composite coatings

The performance of acrylic polyurethane composite coating and aliphatic urethane composite coating in 3.5% NaCl solution under ultra-violet radiation was studied with methods of EIS, SEM and FTIR. For aliphatic polyurethane coating, the coating resistance decreased and the coating capacitance and porosity increased more quickly than acrylic polyurethane coating. The acrylic polyurethane composite coatings showed better performance than aliphatic polyurethane composite coatings. IR spectra showed that under UV irradiation conditions, the failure mechanism of the two polyurethane coatings was the transformation of sec-amide to primary amides. The fractured bonds in acrylic polyurethane were mainly C–O bonds, while in aliphatic polyurethane they were mainly C–N bonds. The lower protection property of aliphatic polyurethane coating may be mainly attributed to the C–N bonds which are more liable to be broken.     

Effects of additives on the performance of two-component waterborne polyurethane coatings

The effects of various additives and solvents on a coating’s performance in a two-component waterborne polyurethane coating system are studied using a statistical experimental design method. Using a blocked arrangement of fractional factorial design matrices, six different independent variables, including the use of different additives, catalysts, as well as solvents at different levels, were examined for their effects on various coating performance parameters, such as gloss, hardness, viscosity, and chemical resistance. Statistical analysis revealed several significant effects of these additives on the coating performances. Most importantly, several two-factor interactions between additives were also found to significantly influence the performance properties of the coating. These interactions could be very difficult to detect using traditional one-at-a-time experimental approaches. The information obtained from this study could be used for designing coating systems with superior performance properties. Presented at the 26th International Waterborne, High-Solids and Powder Coatings Symposium, February 10–12, 1999, New Orleans, LA. Coatings and Colorants Division, 100 Bayer Rd., Pittsburgh, PA 15205-9741.     

室温固化型ABS塑料专用保护涂层材料的研制

研制了一种室温固化型ABS塑料专用保护涂层体系,该体系包括单组分ABS灰白底漆和双组分冰白丙烯酸聚氨酯面漆,通过对涂覆保护涂层ABS试样耐冲击试验以及涂层本身耐QUV老化试验的考察,证明该专用涂层体系对材料具有优异的保护作用,明显改善了ABS制品的外观并大大延长了其使用寿命.研制的该ABS塑料专用保护涂层已在南京某大型汽车零部件生产公司取得了较好的应用,具有很好的市场前景.     

双组分丙烯酸聚氨酯自成型橘纹漆花型改进

采用以低羟值丙烯酸树脂配合快干聚氨酯固化剂,添加中等吸油量的惰性填料,使涂膜既能形成橘纹骨架,又不过度消光.并添加适宜的触变剂,提供假塑性,优选助橘剂,调节表面张力,协同造成橘纹.研制成花纹一次均匀成型、花型较大的双组分自成型橘纹漆.讨论了各种因素对涂料性能的影响.试验结果表明：配制的双组分丙烯酸聚氨酯自成型橘纹漆,一道喷涂可成均匀橘纹,且有柔光效果.     

粉煤灰填充双组分聚氨酯防水涂料的制备

研究了粉煤灰填充双组分聚氨酯防水涂料的效果。粉煤灰的细度对防水涂料的固化速度和涂膜性能都有影响。当粉煤灰的细度为300目时能得到性能优良的双组分聚氨酯防水涂料。     

Failure process of acrylic polyurethane coating under alternate wetting and drying condition

The failure process of an acrylic polyurethane coating in simulated sea water under a wet‐dry cyclic condition and immersion condition was studied with the methods of electrochemical impedance spectroscopy (EIS), Fourier transform infrared spectroscopy (FT‐IR), and scanning electron microscope (SEM). The results show that the failure rate of acrylic polyurethane coating under the condition of wet‐dry alternation is obviously greater than that under complete immersion. Under wet‐dry condition, both the porosity and the water absorptivity of the coating are also greater than those under complete immersion condition. Owing to the physical effect of wet‐dry alternation, the fillers in the coating surface layer may fall off and result in micro‐pores, which could multiply the defects in the coating and accelerate the coating degradation. FT‐IR analysis shows that the isocyanate group in the coating not only participates in the curing of coating, but also hydrolyzes with water molecule. The C‐O bonds fracture partly due to hydrolysis of the main molecule chains, which is one reason of the coating failure. The failure process for acrylic polyurethane coating under a wet‐dry cyclic condition is discussed. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41989.     

高固体份含氟丙烯酸酯树脂的合成及性能研究

通过丙烯酸酯类单体与含氟丙烯酸单体的溶液聚合,制备了高固体份低粘度的含氟多羟基丙烯酸树脂。讨论了反应温度、引发剂、氟单体、羟基值等因素对树脂分子量、黏度以及性能的影响。通过优化条件,结果表明制备的含氟丙烯酸树脂,数均分子量小于6000,分子量分布<1.5,羟基含量>30 mgKOH/g,高固体份低粘度特性显著。通过与固化剂N75按质量比1∶5配制成涂料,常温固化成膜后,测定其各项性能均优于普通丙烯酸聚氨酯树脂涂料。     

锌黄丙烯酸聚氨酯底漆烘干参数研究

通过对锌黄丙烯酸聚氨酯底漆在不同温度下干燥的涂膜进行力学性能试验和耐介质性能试验,确定了该底漆的烘干参数为120℃保温1 h。     

太阳能反射镜镜背保护涂料的应用研究

以灰色环氧磷酸锌防腐涂料为底漆、丙烯酸改性聚硅氧烷涂料或丙烯酸聚氨酯涂料为面漆,作为太阳能反射镜镜背保护涂料,对保护涂料的施工工艺以及2种面漆的防护性能等进行了研究,研究表明:丙烯酸改性聚硅氧烷涂料配套体系的附着力、反射率、中性盐雾、CASS喷雾试验、人工加速老化、湿热试验及抗气候循环试验等各项性能指标达到了相应的技术标准,较传统的丙烯酸聚氨酯面漆在恶劣环境中更适合太阳能反射镜的保护。     

微波干燥应用于双组分水性聚氨酯木器漆的干燥过程

干燥问题是长期以来制约水性双组分聚氨酯木器涂料工业化应用的瓶颈。将微波干燥应用于水性双组分聚氨酯木器涂料的干燥过程,打破了微波干燥只能应用于水性单组分涂料的传统观念,实验结果表明:水性双组分聚氨酯木器涂料经微波干燥形成的漆膜性能略高于常温干燥形成的漆膜,可与溶剂型双组聚氨酯木器涂料相媲美,且固化剂用量减少。     

丙烯酸/蓖麻油聚氨酯耐磨涂料的研究

介绍了丙烯酸/聚氨酯涂料的制备和性能测试工艺流程以及蓖麻油改性TDI制备聚氨酯、丙烯酸树脂和丙烯酸改性聚氨酯涂料的合成步骤。通过正交实验对羟基丙烯酸树脂和耐磨性填料———二硫化钼、氧化铬和聚四氟乙烯的用量进行了优化,获得了涂料的最优化配方(用质量分数表示):A组分:聚氨酯3%,醋酸丁酯3%;B组分:羟基丙烯酸1.5%,二硫化钼0.3%,三氧化二铬0.4%,聚四氟乙烯0.6%,混合溶剂5%,十二烷基硫酸钠0.12%,KH-5500.025%,二丁基二月桂酸锡0.0125%。所得涂膜的表干时间约为30min,实干时间约为36h。涂层的附着力1级,硬度1B。在3.3kg的载荷下,磨轮旋转1500圈后,涂层磨痕弦长6.5mm,说明涂料耐磨性优良。试样在质量分数分别为5%和15%的盐酸、氢氧化钠溶液中浸泡一周后,涂层无起泡、润胀和脱落现象,说明涂层耐蚀性优良。     

双组分水性丙烯酸酯聚氨酯涂料的改性及影响因素研究进展

介绍了用于双组分水性聚氨酯涂料的羟基丙烯酸酯树脂分散体(A组分)和多异氰酸酯(B组分)的改性进展;综述了丙烯酸酯树脂分散体的活性基、酸值、羟值、玻璃化温度Tg、中和剂、中和度、溶剂以及多异氰酸酯等因素对双组分水性丙烯酸酯聚氨酯涂料性能的影响;提出了双组分水性丙烯酸酯聚氨酯涂料的发展趋势。     

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。     

水性聚氨酯木器涂料改性研究进展

水性聚氨酯木器漆具有良好的性能，是目前水性木器漆研发的一个热点和重点。介绍了单组分水性聚氨酯涂料和双组分水性聚氨酯涂料的制备和性能，综述了水性聚氨酯木器涂料的改性研究进展。     

Tuning the mechanical performance and adhesion of polyurethane UV cured coatings by composition of acrylic reactive diluents

An approach to modify the properties of UV curable polyurethane coatings by altering the amount and functionality of acrylic reactive diluents, in order to optimize the coating performance, is demonstrated. Based on the rheology analysis, a model of the rheological behavior of the UV curable materials depending on the amount and type of a reactive diluent in the composition is demonstrated in this study. The relationships between the rheological behavior, the mechanical properties and adhesion of the coatings prepared from polyurethane UV curable compositions containing different amounts and functionalities of acrylic reactive diluents, have been investigated and discussed in this study. Based on the results of the study, the desired properties of UV cured coatings can be modeled and controlled without changing the nature of a particularly selected oligomer, thus maintaining the advantages of its chemical structure in a coating composition.     

应用于塑料基材的溶剂型双组分聚氨酯柔感涂料

通过对树脂、助剂和固化剂进行筛选,获得了适用于塑料基材的溶剂型双组分聚氨酯柔感涂料配方。测试了涂膜的各项性能。结果表明,该双组分柔感涂料具有附着力佳、手感细腻滑爽、抗划伤力强以及优异的耐腐蚀等性能。讨论了柔感涂料施工过程中常见的问题及其解决办法。     

UV固化超支化聚氨酯丙烯酸树脂的研究进展

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。