浅谈汽车涂装车身打磨

汽车涂装中车身打磨的主要作用是消除车身表面的颗粒、粗糙和不平整度,增强涂层间的机械附着力等。简要介绍了车身不同涂层的打磨操作方法、步骤及作用。     

附着力促进剂对光固化金属涂层附着力提升的研究

为了探究附着力促进剂对光固化金属基涂层附着力的影响，本文通过划格法、拉拔法及搭接剪切实验，系统研究了磷酸酯类附着力促进剂、硅烷偶联剂对光固化金属基（低碳钢、铝板）涂层附着力的促进作用。结果表明：磷酸类附着力促进剂能够显著提高光固化金属基（低碳钢、铝板）涂层的附着力，而硅烷偶联剂对光固化金属基（低碳钢、铝板）涂层的附着力无明显提升作用。     

附着力促进剂对光固化金属基涂层附着力提升的研究

为了探究附着力促进剂对光固化金属基涂层附着力的影响,本文通过划格法、拉拔法及搭接剪切实验,系统研究了磷酸酯类附着力促进剂、硅烷偶联剂对光固化金属基(低碳钢、铝板)涂层附着力的促进作用。结果表明:磷酸类附着力促进剂能够显著提高光固化金属基(低碳钢、铝板)涂层的附着力,而硅烷偶联剂对光固化金属基(低碳钢、铝板)涂层的附着力无明显提升作用。     

塑料件油漆涂层耐水性能不合格原因分析及预防措施

油漆涂层对汽车塑料件起到保护和装饰作用,而涂装过程中常有涂层性能不合格情况发生。本文简述了塑料件油漆涂层耐水性能试验中出现的起泡及附着力不合格原因,并提供了在涂料生产和涂装施工中需注意的事项。     

施工工艺

通过印刷获得医疗设备精密涂层;汽车和摩托车修补涂层用的非彩色底漆表面的色彩鉴定法;多道涂层及形成方法;热沉积工艺提高对铝的电镀附着力     

环氧粉末涂层对金属基材附着力的影响因素

环氧粉末涂料具有附着力好、耐腐蚀性强、耐温性能好等优点,在金属防腐特别是重防腐领域应用非常广泛。在环氧粉末涂层的诸多性能中,涂层对基材的附着力是非常重要的一项技术指标,也是满足其他性能的基础,附着力的好坏直接影响着涂层对基材的保护寿命。本文主要从喷涂温度、基材表面处理的表面粗糙度以及粉末涂料原材料等方面讨论了环氧涂层对金属基材表面附着力的影响因素。研究表明：喷涂温度提高有利于涂层附着力的提高,表面粗糙度提高且锚纹深度相对均匀有利于涂层附着力的提高,填料以及助剂的种类对附着力具有一定的影响。     

热——光双重固化涂层对金属表面附着的影响

文章阐述了涂层在金属基材表面的附着理论,其中,静电吸附理论在紫外光固化涂层对金属基材表面附着的过程中起主导作用。重点分析了热——光双重固化方式、固化过程、低聚物、单体对涂层附着力的影响,引入柔性链段和极性基团的低聚物、单体,能增加涂层对金属基材表面的润湿程度,增加分子间作用力和氢键,减少涂层的体积收缩率,对提高涂层在金属基材表面的附着力有一定的帮助。     

水性可剥防护涂料的研制

水性可剥防护涂料是应用于汽车、舰船、大型仪器和设备的涂装、运输及存放等方面的临时保护涂料。主要研制并讨论了水性可剥防护涂料对不同基材及不同类型的涂层的可剥离性以及临时保护作用,并实验了其从基材和其他涂层表面剥离后对被保护涂层光泽度及附着力的影响。结果表明,该水性可剥防护涂料在多种基材上均具有良好的可剥离性,并且对被保护涂层的光泽度、附着力及表面状态几乎没有影响。     

油管静电喷涂环氧粉末的附着力影响因素分析

附着力是环氧粉末涂层的重要质量指标之一,附着力的强弱直接关系到涂层的使用效果,本文从粉末本身的性能、喷砂工艺和喷涂生产过程谈了提高涂层附着力的几点看法。     

低温固化GMA丙烯酸粉末涂料的开发与应用

对环氧丙烯酸树脂进行改性,并用二元羧酸固化,通过混合、熔融挤出、磨粉、过筛制得适合塑料底材涂装的120 ℃低温固化环氧基丙烯酸粉末涂料。与红外固化方式相结合,可缩短固化时间。对聚丙烯材质的汽车保险杆进行表面处理后,将低温固化环氧丙烯酸粉末涂料涂装在表面处理过的汽车保险杆上,提高涂层在保险杠上的附着力。检测结果表明:涂层具有优异外观、附着力和耐候性,降低了目前保险杠涂装时的VOC排放。     

聚乙烯塑料涂装工艺

聚乙烯塑料通常难以进行表面涂装。本文采用特殊前处理工艺改变塑料表面分子结构和表面粗糙度，提高涂层与塑料表面的结合力。提出了聚乙烯塑料前处理和涂装工艺，配方。     

镍镀层表面薄金镀层的焊接特性研究

本文对电子产品天线或者印刷线路板中的镍镀层表面的薄镀金层,由于镀金层薄存在孔隙,在产品焊接过程中产生了表面焊点润湿不良的缺陷而影响焊接性能的过程进行了研究。通过对镀镍表面薄镀金层表面的金属做金属溶胶水溶液封闭润湿性处理,可以有效改善镍镀层上镀金层的表面接触角和微观形貌,镀薄金层的表面焊接性能也得到提高。     

木塑复合材料的界面影响因子研究

木粉塑料表面理化性质不一样,不能很好相容,木塑界面的强度将会很大程度上影响木塑复合材料的力学性能,综述了用润湿理论来研究木粉和塑料的表面自由能、表面极性对界面强度的影响,弱边界理论研究木粉对界面的影响,以及偶联剂的作用机理探讨偶联剂的选择。     

TiB2表面镀铜工艺

利用化学镀覆技术成功在TiB2颗粒表面均匀化学镀覆铜。透射电子显微镜观察表明：通过严格的镀前预处理工艺的优化设计以增加活化点,对传统镀液配方的调整以降低镀速,能够成功地在TiB2颗粒表面镀覆一层铜,从而培强了其和铜基体之间的界面结合力,为TiB2在复合材料领域之中的应用打下了坚实基础。     

Coating solvent effects producing adhesion to molded plastic parts

While adhesion is of paramount importance to ensure durability and quality of a coating system, solvents have long been known to affect coating adhesion to molded plastics, including polyolefins. Varions research group in their characterizations of interfaces and/or adhesion to plastics, have produced much understanding of the role played by solvents in adhesion to plastics. However, the 'goodness' of a coating solvent for the plastic, defined as a small Flory interaction parameter χ12, was not indicative of the quality of the coating adhesion to the molded plastic substrates under consideration. For instance, coating adhesion to either polypropylene or ethylene–styrene interpolymer substrates, as affected by the coating solvent, was poorly related to the solvent–polymer miscibility, the magnitude of solubility parameter mismatch, or the ability of the solvent to swell the polymer bulk, except where such swelling produced a topographical change to the polymer surface. Though the topographical change was different for polypropylene compared to the interpolymer surface, if a coating solvent induced little or no change in the topography of a molded plastic then little or no coating adhesion to the plastic was observed. Polymer surface crystallinity reduced the amount of topographical change caused by a solvent and, likewise, reduced adhesion of a coating containing the solvent. The alteration of topographical features by solvent provides an adhesion mechanism and an explanation for the reported formation of diffuse interfaces and how a coating solvent could expose sub-surface domains within a polymer substrate.     

聚氨酯丙烯酸水性木器涂料附着力影响因素的研究

以水性聚氨酯丙烯酸酯乳液(PUA)为基料配制水性木器涂料。从润湿与附着的角度考察了乳液种类、涂布量、基材润湿剂、附着力促进剂、成膜助剂等对PUA涂膜附着力的影响。结果表明:PUA乳液表面张力越低,润湿性越好,PUA涂膜附着力越强;涂布量增加,涂膜厚度增加,涂膜附着力降低;加入0.6%~0.8%(质量分数)基材润湿剂可明显提高涂膜附着力;附着力促进剂硅烷偶联剂能有效提高涂膜附着力;成膜助剂也对涂膜附着力有影响。     

紫外光固化塑料涂料中助剂的应用

以UV固化塑料涂料基本配方为依据,研究了流平剂、润湿分散剂和消泡剂的不同用量对ABS塑料表面外观、附着力、硬度、抗冲击性等的影响。结果表明,当流平剂质量为2g、润湿分散剂为0.5g、消泡剂为0.6g(配方总量为107.9g)时得到的涂膜性能最佳。     

载酶塑料填料的制备与优化

酶催化反应精馏（ERD）是使用酶作催化剂,将反应精馏（RD）与生物催化相结合的过程。近年来,该工艺过程因其高选择性和环境友好性而日益得到认可。本文研究了塑料填料固定化酶,将含有脂肪酶的溶胶-凝胶溶液喷涂到塑料填料表面,制备了载酶塑料填料。载酶填料作为精馏柱内不可或缺的结构单元,其稳定性是影响ERD发展的重要因素。溶胶-凝胶配方各组分的相对含量直接影响凝胶基质和被包埋酶的性能,因此,本研究对凝胶配方进行了优化,以改善塑料填料载酶涂层的开裂问题。用傅里叶红外光谱（FTIR）、扫描电镜（SEM）对样品进行了表征,并对黏附强度、循环稳定性、机械性能、酶活性和催化效率进行了研究。结果表明,塑料填料表面凝胶涂层的脆性开裂情况得到了改善,涂层与填料的结合强度提高了14.2%。溶胶-凝胶配方的优化可以改善凝胶基质的性能,提高载酶填料的机械稳定性,且优化配方制备的催化剂具有优异的酶学稳定性。这一工作证明了塑料填料固定化酶的可行性,为ERD的工业化打下基础。     

Contact-angle development of polymer melts

In powder coatings, the quality of the final film is often associated with its smoothness. This is affected by the wetting and levelling process which occurs during film formation and is mainly determined by surface tension (driving force) and viscosity (resistance).

Especially for the surface tension the requirements are complex. On the one hand a lower surface tension facilitates the substrate wetting process, but if it is too low levelling is poor, resulting in wavy surfaces (“orange peel”). On the other hand, a higher surface tension promotes levelling, but if it is too high the wetting is poor, resulting in crater defects. Therefore, the surface tension of a powder coating has to be optimised carefully. It can be adjusted by addition of “levelling” or “surface flow” compounds to a formulation as well as changing the composition of the resin. Most of the current knowledge however is based on trial and error and a more systematic approach should provide better fundamental insight into the interrelation between the different parameters.

Since there is no generally accepted method of measuring wetting and levelling, a new method has been devised by which the actual melting and flow process can be monitored. The method provides information about the wetting and flow process of polymers by measuring the contact-angle of polymer melts as a function of temperature and gives significant and consistent results while data analysis provides quantitative information.

In this presentation, the method will be explained and examples will be given, showing the effects of structural parameters of coating binders on their wetting and flow behaviour.     

Self-stratifying coatings: a review

A self-stratifying coating is an economical coating containing multiresinous components with different functional groups, which spontaneously stratify after application to the substrate. These coating systems could be composed of two or more different layers to protect substrates against corrosion, by first layer, and simultaneously to create a desirable appearance, by second layer, with decorative properties. Conventional multilayer coating systems encounter some problems such as poor interfacial adhesion, application, and labor costs and also lengthy processing time. The concentration gradient of two layers would eliminate the inter-coating boundary which can be the point of failure in conventional coatings. In this paper, the surface tension and solubility theory regarding these coatings are discussed. In addition, the effects of different factors on the pigment location into the coating systems are studied. The main factors, including curing mechanisms, substrate effects, thickness, viscosity, kinetics of reaction, evaporation rate of solvents, dispersing agents, and surface properties of pigments have been reviewed. The models for prediction of self-stratifying coatings such as UNIFAC and computer simulation have also been addressed and taken into consideration. The prospect of these coatings and their application in different industries is presented.