辐射固化涂料及其发展

综述了红外线固化、紫外线固化和电子束固化等辐射固化涂料所用的设备、固化机理、涂料组成、它们的共性及区别,从涂料和涂膜性能、节省能源、环境友好等方面比较了辐射固化涂料和传统涂料,并展望了辐射固化涂料的发展前景。     

Coating performance and characteristics for UV-curable aliphatic urethane acrylate coatings containing norrish type I photoinitiators

The purpose of this study was to investigate the influence of several Norrish I (α-cleavage) type photoinitiators and UV dose on the curing behavior and coating performance of UV-curable aliphatic urethane acrylate coatings. UV-curable coatings were cured under a high-pressure mercury lamp. The curing behavior and coating performance of the UV-curable coatings that were cured using 2-hydroxy-2-methyl-1-phenyl-propan-1-one or 1-hydroxy-cyclohexyl-phenyl-ketone were superior to those of the UV-curable coatings cured using bis (2,4,6-trimethylben-zoyl)-phenylphosphine oxide or diphenyl (2,4,6-trimethylbenzoyl)-phosphine oxide, when the UV-curable coating was cured in air. Current address: Electronic Chemical Materials R&D Center, CHEIL Industries Inc.     

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。     

Light stabilisation of UV-curable powder coatings

UV-curable powder coatings have opened up new possibilites in actually combining the advantages of both powder and UV-curable systems. UV powders provide better flow (little or no orange peeling), no monomer emission, better cost effectiveness (shorter, low temperature melting and short UV curing cycles) and new application possibilities on heat sensitive substrates such as wood and plastics. In addition to the resins available (several radical and cationic curing systems are offered by resin suppliers), the choice of proper photo-initiators and light stabilisers is vital to obtain the required quality and durability properties for exterior applications.     

Mica pigments in solvent free coatings systems

Mica pigments are nowadays extensively used in different solvent containing paint systems, e.g. in automotive paints. Although water-borne coatings are gaining more and more importance, the need for even more environmentally safe to use coatings calls for coatings with less or even no solvents. To achieve this goal—no solvents—basically two technologies are used: one is powder coating, the other is radiation curing like UV- and electron beam-curable systems. Together with the need for more environmentally safe paint systems the consumer also requests highly esthetic coatings, especially concerning colour and effect. This paper describes how mica pigments, which are themselves environmentally safe and are used for high esthetic requirements, work in solvent free paint systems like powder coating and radiation-curable systems. Special attention is given to how mica pigments can be incorporated into powder coatings and what measures have to be taken to achieve an optimised effect. Concerning radiation, especially UV-curable systems, the advantages of mica pigments compared to other effect pigments are discussed.     

光固化不饱和聚酯树脂研究进展

综述了光固化不饱和聚酯树脂体系研究进展,其中包括:不饱和聚酯光敏预聚物的合成,可见光固化树脂,光固化UPR复合材料,光固化粉末涂料,紫外光固化胶衣树脂,光固化胶粘剂等。     

紫外光固化涂料的研究进展

介绍了紫外光固化涂料的构成体系：自由基光固化体系、阳离子光固化体系和阳离子与自由基混合光固化体系。对紫外光固化涂料的制备方法进行了综述,并简介几种新型紫外光固化涂料。     

中密度纤维板(MDF)粉末涂料低温固化技术研究

为了制备中密度纤维板(MDF)用低温固化粉末涂料,合成了一种液体叔胺促进剂,成功使聚酯/环氧粉末涂料在130℃,3 min条件下快速固化,并研究了促进剂用量对粉末涂料固化及涂层性能的影响,利用差示扫描量热仪(DSC)、红外光谱仪(FI-IR)对涂膜固化行为进行了分析:结果显示:促进剂用量提高可以有效降低固化温度和加快固化反应速率,促进剂的最佳用量为2 g时,固化后的涂层与底材结合力高.具有优异的机械性能和耐化学品性。DSC和红外光谱分析结果表明所制备的粉末涂料具备优异的低温固化性能,固化温度低于130℃。     

中密度纤维板(MDF)粉末涂料低温固化技术研究

为了制备中密度纤维板(MDF)用低温固化粉末涂料,合成了一种液体叔胺促进剂,成功使聚酯/环氧粉末涂料在130℃,3 min条件下快速固化,并研究了促进剂用量对粉末涂料固化及涂层性能的影响,利用差示扫描量热仪(DSC)、红外光谱仪(FI-IR)对涂膜固化行为进行了分析:结果显示:促进剂用量提高可以有效降低固化温度和加快固化反应速率,促进剂的最佳用量为2 g时,固化后的涂层与底材结合力高.具有优异的机械性能和耐化学品性。DSC和红外光谱分析结果表明所制备的粉末涂料具备优异的低温固化性能,固化温度低于130℃。     

气相二氧化硅对紫外光固化光纤涂料性能的影响

用聚氨酯丙烯酸酯与环氧丙烯酸酯预聚物按一定比例共混制备出性能较好的紫外光固化光纤涂料。着重研究了气相二氧化硅填料的加入对光纤涂料性能的影响。研究发现：气相二氧化硅填料的适量加入能有效降低涂料的吸水性，而对涂料的光固化速度等性能无明显的影响。此外，还探讨了聚合物涂层中气相二氧化硅微粒改善光纤疲劳与老化性能的作用机理，发现2％（质量分数）的气相二氧化硅填料使氧合物涂层的吸水率最小，从而降低光纤表面的侵蚀速率。     

Influence of thermo-analytical and rheological properties of an epoxy powder coating resin on the quality of coatings on medium density fibreboards (MDF) using in-mould technology

Powder coating of engineered wood panels such as medium density fibreboards (MDF) is gaining industrial interest due to ecological and economic advantages of powder coating technology. For transferring powder coating technology to temperature-sensitive substrates like MDF, a thorough understanding of the melting, flowing and curing behaviour of the used low-bake resins is required. In the present study, thermo-analysis in combination with iso-conversional kinetic data analysis as well as rheometry is applied to characterise the properties of an epoxy-based powder coating. Neat resin and cured powder coating films are examined in order to define an ideal production window within which the resin is preferably applied and processed to yield satisfactory surface performance on the one hand and without exposing the carrier MDF too high a temperature load on the other hand to prevent the panel from deteriorating in mechanical strength. In order to produce powder coated films of high surface gloss – a feature that has not yet successfully been realized on MDF with powder coatings – a new curing technology, in-mould surface finishing, has been applied.     

有机硅树脂在粉末涂料中的改性作用及应用进展

综述了近年来国内外有机硅树脂在粉末涂料中的应用研究进展。讨论了有机硅树脂与有机树脂通过共混、化学结合作为粉末涂料基材以及互为固化剂等不同改性方式的特点。有机硅组分的引入可以改善和提高粉末涂料涂膜性能 ,特别是耐候性及耐热性能。展望了有机硅改性树脂在粉末涂料中的应用和发展前景。     

耐候型聚酯粉末涂料的研究进展

针对户外用粉末涂料的老化,介绍了国内外耐候型聚酯粉末涂料的研究进展。阐述了其目前在树脂合成与改性、固化体系和固化剂选择及添加特殊助剂等方面的发展方向,并简要分析了其抗老化机理。指出作为粉末涂料的主要组成物质,聚酯和固化剂的性能对粉末涂料的耐候性起着至关重要的作用,同时添加纳米粒子改性粉末涂料也是提高其耐候性的一种新型有效的方法。     

羟烷基酰胺体系低温固化超耐候粉末涂料用聚酯树脂的合成研究

为克服聚酯树脂的性能缺陷,进一步提升羟烷基酰胺体系超耐候粉末涂料的耐候性能,使用溶液聚合制备环氧基丙烯酸酯预聚物,通过研究丙烯酸预聚物环氧值、用量对改性聚酯性能的影响,考察酸解剂对聚酯性能的作用,采用酯化缩聚工艺设计并制备出适用于羟烷基酰胺（ Primid）体系低温固化超耐候粉末涂料的新型聚酯树脂。结果表明：合成的新型聚酯具有高反应活性, 160 ℃固化涂层可兼顾耐冲击性和流平效果,涂料同时具有优异的贮存稳定性和突出的超耐候性。     

高性能聚氨酯粉末涂料的研究

比较了不同聚氨酯粉末涂料固化剂的性能,考察了催化剂对胶化时间的影响,介绍了一种制造消光聚氨酯粉末涂料的方法,该方法所制得粉末涂料固化后涂层平整光滑、物化性能优异,可以调整出各种光泽的涂层,并且在生产过程中光泽比较稳定,重现好。     

Alkyd resins: From down and out to alive and kicking

Alkyd resins have been introduced in the 1930s as binders for paints. Their compatibility with many polymers and the extremely wide formulating latitude made them suitable for the production of a very broad range of coating materials. This includes do-it-yourself paints and varnishes for wood and metal, road marking paints, anticorrosive paints, nitrocellulose lacquers, two-component isocyanate curing coatings, acid curing coatings, stoving enamels, etc. Except for phthalic anhydride, being of petrochemical origin, the other raw materials used in the synthesis of the alkyds are from biologically renewable sources. This, combined with their biological degradability, makes them very interesting binders from an ecological point of view. Solvents which are used to reduce and adjust the paint viscosity are the only concern with respect to the ecological aspects of the alkyd paints. In recent years, however, we witness quite an activity in designing alkyd emulsions and high solids alkyds which can serve as binders for environmentally friendly coatings.     

常用光引发剂在紫外光固化涂料中的应用研究

针对紫外光固化体系,研究了常用光引发剂在紫外光固化涂料中的应用。讨论了常用光引发剂的用量及其对亮光体系、亚光体系和色漆体系固化性能的影响。得出在紫外光固化涂料中选择引发剂的规律。     

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。     

Basic investigations for development of new curing mechanisms for powder coatings

Powder coatings have attained great importance as coating materials because of their economic and environmental benefits. However, there are also some limitations which have prevented the penetration of solid paints into some promising markets up to now. A new concept of combined reactions is introduced in order to find a control mechanism for flow procedure that is dependent on the curing reaction for powder coatings. Useful combinations were found by characterization of reactivity in one-stage curing reactions in bulk using low molecular models. A two-stage reaction mechanism was proved in combined low molecular model systems as well as in polymeric powder coating basic systems consisting of binder and hardener for various combined reaction systems. Results are shown for the combined reaction system epoxide/carboxylic acid/phenolic compound.     

Recent developments in two-pack water-based epoxy coatings

In recent years new curing agent technology has been developed which allows water-based curing agents to be introduced into high performance coating, these are classified according to the type of epoxy resin used. Type I utilises low molecular weight, liquid epoxy resins and Type II pre-formed dispersions of higher molecular weight solid epoxy resins. The chemical composition of the binder of water-borne epoxy coatings plays a critical role in their performance properties, hence some of the structural properties of the amine hardeners will be reviewed. New curing agents will be discussed which demonstrate the versatility these products can offer to the coating formulator. Performance data of clear coats and anti-corrosive primers confirm the applicability of the new systems for the long term protection of steel and concrete surfaces.