绿色颜料在高性能涂料中的应用

该文阐述了绿色无机颜料和绿色有机颜料在氟碳涂料、高级建筑涂料、重防腐蚀涂料、汽车涂料、卷材涂料、隔热反射涂料、示温涂料、导电涂料等高性能涂料以及对环境友好的水性涂料、粉末涂料、紫外光固化涂料等领域的应用。     

浅谈对外墙乳胶色漆耐候性的影响因素

从基础漆中的乳液、颜填料和水性色浆的结构、颜色搭配等方面，叙述了对外墙乳胶色漆耐候性的影响。     

水性防锈涂料

介绍了以铁红、磷酸锌等为主要防锈颜料，苯丙乳液为基料的综合性能优良的水性防锈涂料的制备，分析了影响涂料性能的因素，并与油性防锈涂料进行了性能比较。     

Microwave assisted HMDSO/oxygen plasma coated polyethylene terephthalate films: Effects of process parameters and uniaxial strain on gas barrier properties,surface morphology,and chemical composition

The coating structure and barrier property relation of coated PET films is of high interest for understanding the difference between predicted and actual barrier performance of coated PET films. In this work the chemical and morphological structure of HMDSO coatings generated with and without oxygen in a microwave plasma has been investigated with XPS and AFM analysis. These results were correlated with oxygen permeation measurements at different strain rates and temperatures. The results show that with a more glass‐like chemical composition the barrier property is improved. The growth of the coatings takes place in a columnar manner and the interfaces between the columns seem to be the low energy passages for the permeation, which cause the difference between predicted and actual barrier performance. When the coatings are strained the barrier fails at a strain higher than 1%. Cracks occur and with higher strain rates the number of cracks increases. Cracking takes place perpendicular to the strain direction and at the interfaces of the columns of the coating. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 1485–1495, 2006     

一种水性含氟可剥离涂料的研制

介绍了一种水性含氟可剥离涂料的研制过程,通过合适的树脂配比、颜填料与助剂选择,制备了一种具有较好可剥离性的水性涂料,达到了可剥离涂料的性能要求指标。     

Water permeability of pigmented waterborne coatings

Coatings are used in a variety of applications. Last decades more and more coating systems are transforming from solvent to waterborne coating systems. In this study the influence of pigments on the water permeability of a waterborne coating system is studied, with special interest in the possible interfacial layer of additives around the pigments. In our study an acrylate based binder is mixed with different glass sphere concentrations and sizes. Subsequently, the coating permeability is studied through wet-cup experiments and water uptake in the coating, either on a glass substrate or on wood, is monitored with NMR. These experiments show that water is absorbed more quickly by coatings containing glass spheres. From the experimental results it can be concluded that an interface layer around the pigment particles facilitates water migration and increases the effective diffusion. A modification of the effective medium theory is used to describe the observation and good agreement between experiments and theory is obtained. Both theory and experiment show that in a coating a layer around the pigments facilitates water transport and increases the effective diffusion constant.     

几种水性防锈漆的性能比较

以丙烯酸改性环氧酯、苯丙、纯丙乳液为漆基制备水性防锈漆,与溶剂型醇酸防锈漆比较,研究了几种水性防锈漆涂膜的机械性能与防锈性能,分析了水性防锈漆的防锈机理以及导致不同防锈漆之间防锈性能差异、涂层耐水性与耐盐水性差异的原因。     

Structure of waterborne coatings by electrochemical impedance spectroscopy and a thermostimulated current method: influence of fillers

Electrochemical impedance spectroscopy (EIS) was coupled with a thermostimulated current (TSC) method to investigate the effect of fillers on the barrier properties of an epoxy-polyamido amine waterborne coating on a 2024 aluminium alloy. Four systems were studied: a clear coat and three pigmented coatings (with and without chromates). The results obtained by TSC highlight the specific action of chromates which decrease the molecular mobility (hardening) of the coating by comparison with neutral fillers. This has been explained by the high polarity of chromates that enhances interactions with the binder. Impedance measurements carried out for free-standing films and for coated aluminium alloy have corroborated the role of chromates on the barrier properties of the coating which remain high as a function of exposure time in a 0.5 M NaCl solution. TSC was also used to measure the glass transition temperature (T_g) of the hydrated systems. T_g was significantly decreased when the coatings were hydrated due to a strong plasticization effect induced by water uptake. For the different systems, we conclude that the weak barrier properties of the films (attached films) or the decrease of the barrier properties with time (free-standing films) were linked to the variation of the glass transition temperature by water uptake.     

Mechanisms of non-toxic anticorrosive pigments in organic waterborne coatings

Investigations have been carried out concerning the mechanism of the behaviour of non-toxic anticorrosive pigments belonging to the group of phosphates, ferrites and ion exchange pigments in waterborne systems. The mechanism controlling the protective effectiveness of organic coatings is complex and results from simultaneous activity of various agents, from among which the kind of the corrosion inhibitor and the structure of the coating are of fundamental importance. The effect of pigments on the protective properties of coatings was tested by means of electrochemical impedance spectroscopy (EIS), scanning vibrating electrode technique (SVET) as well as the salt spray and Prohesion tests. For the investigation of the structure of coatings the porosymetric method and modulated-force thermomechanical analysis (mf TMA) were applied. The results of these investigations have shown that calcium zinc phosphate and zinc ferrite are the most effective. These pigments take part in the passivation of steel, which has been proved by the results of electrochemical investigations and by the presence of the passive layers as has been found out by X-ray diffraction (XRD), energy dispersive X-ray analysis (EDXA) and scanning electron microscopy (SEM). Calcium zinc phosphate and zinc ferrite affect the structure of the coatings, increasing the glass transition temperature (Tg) of the coatings. Zinc phosphate and calcium-exchanged silica do not act in compliance with electrochemical mechanism neither do they improve the barrier properties of the binder.     

环保型建筑钢结构涂料发展形势分析

介绍了环保型建筑钢结构涂料的应用状况,包括:无公害高性能防锈颜料和环保型涂料树脂的使用,建筑钢结构涂料固体含量的提高,水性钢结构涂料和低表面处理涂料的应用等.指出中国建筑钢结构涂料已步入世界先进行列.     

水性热反射船壳漆的研制

研制了一种水性太阳热反射型船壳涂料,考察了不同的基料、相同的隔热颜填料和颜基比对涂层耐介质性能的影响。采用光反射率表征了涂料对可见光、红外光的反射性能。结果表明,以水性聚氨酯树脂为成膜基料,以钛白粉、云母粉、空心陶瓷微珠为隔热功能颜填料,再加上水及助剂等,制备出的涂层与同样体系的溶剂型热反射船壳漆对可见光和近红外光的反射率基本相同。     

The influence of binder content on the water transport properties of waterborne acrylic paints

Diffusion coefficients and sorption isotherms of water in waterborne acrylic paint films and in the pure binder of the paints have been measured by gravimetric sorption. Solubility of water was found to enhance with the increased binder content in the paint films while the diffusivity of water decreased significantly. Sorption isotherms in the paint and pure copolymer films were correlated with the Flory Huggins theory and ENSIC model, respectively. Fickian diffusion was observed in both types of films and the kinetic data were best correlated with a numerical model which takes into account the concentration dependency of the diffusion coefficient and the dimensional change of the film due to sorption. It was concluded that the utilization of a simplified analytical solution may lead to significant errors in the estimation of diffusivities.     

Effect of different polymers on the efficiency of water‐borne methyl amine adduct as corrosion inhibitor for surface coatings

Styrene/acrylic emulsion copolymer and water‐based short oil urethane alkyd resin were used as binders to prepare water‐based, environmentally friendly paints by using 0.5% emulsified methylamine adduct as corrosion inhibitor. The choice of the two above‐mentioned binders was based on the fact that styrene/acrylic emulsion copolymer is a nonconvertible binder, whereas short oil urethane alkyd resin is a convertible binder. The physical, chemical, mechanical, and corrosion properties of the paint films were evaluated and compared with a commercially known anticorrosive water‐based paint. It was found that the prepared paints have unique desirable properties such as the following: they do not contain anticorrosive pigments (which contain heavy metals in their main chemical structure); they are solvent‐free; and they can be produced to match any color. Corrosion tests on the films of the formulated paints revealed that the short oil urethane alkyd resin is superior to the styrene/acrylic copolymer. Moreover, the corrosion inhibition properties of the paint films prepared from both binders are comparable with the commercially available paints containing anticorrosive pigments. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 879–885, 2002     

Influences of silicone emulsion on fire protection of waterborne intumescent fire-resistive coating

The combination of self-crosslinking polyacrylate emulsion and silicone emulsion was used as a binder for the preparation of waterborne intumescent fire-resistive coatings. The influences of silicone emulsion on fire protection and char formation of the coatings were investigated in detail by means of TGA, SEM, energy dispersive spectroscopy analysis, rheological measurement, and fire protection tests. The results showed that using silicone emulsion improved thermal stability and antioxidation ability of the coating and increased the residue weights of the char layer at high temperature. Furthermore, an appropriate amount of silicone emulsion could improve the rheological property of the mixed binders and be conducive to the increase of the intumescent factor of the coatings, thus improving the fire protection of the coating significantly. However, an excess amount of silicone emulsion can lead to uneven dispersion of silicone emulsion in the mixed binder and cause an uneven distribution of cell size of the char layer.     

水性双组分聚氨酯防锈漆的研制

以水性聚氨酯树脂和多异氰酸酯固化剂为主要原料,制备了水性双组分聚氨酯防锈漆,并检测了涂料的性能指标。检测结果表明：该涂料的各项性能指标均达到可用于金属表面涂装的标准要求。讨论了成膜树脂、固化剂用量、防锈颜料和流变助剂对涂料性能的影响。     

双组分水性聚氨酯涂料的合成与表征

随着环境法规对涂料的挥发性有机化合物（VOC）含量的限制，高性能与低VOC含量相结合的双组分水性聚氨酯涂料成为涂料工业发展的趋势。采用三羟甲基丙烷（TMP）为扩链剂合成具有交联结构的水性聚氨酯分散体多元醇，与多异氰酸酯固化剂组成双组分水性聚氨酯涂料。研究发现双组分涂膜的机械性能和外观是由合成的水性聚氨酯多元醇的扩链剂（TMP）含量，中和度，中和工艺和双组分涂料的配比等决定的。当扩链剂含量为2％－4％，中和度为100％，NCO:OH=1．0－1．2时所得双组分水性聚氨酯涂膜外观好，快干，硬度高和施工方便。     

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.     

Nanofibrillated cellulose in wood coatings: Dispersion and stabilization of ZnO as UV absorber

The effect of nanofibrillated cellulose (NFC) on the dispersion and stabilization of zinc oxide (ZnO) nanoparticles in waterborne wood coatings was examined. Different coating compositions with and without NFC at varying concentrations of unstabilized, powdery or stabilized ZnO were produced. Properties of free coating films prepared via bar coating and wood specimens coated by brush with the coating compositions were evaluated. This included the effects of NFC and ZnO on the coating appearance, film formation, distribution of ZnO in the coatings, tensile properties and UV absorbing properties of free films and the effects of artificial weathering on the coated wood specimens. We showed that NFC significantly improved the distribution of the unstabilized ZnO in the coatings and prevented sedimentation of ZnO. NFC also improved film formation and inhibited crack formation during curing and weathering for more brittle binder materials. NFC had a pronounced matting effect but did not influence the coating colour. Colour stability of coated wood specimens during weathering was affected by the ZnO content, but needs further improvement. The results show that the biopolymer NFC is suitable to stabilize ZnO in coatings for wood, which could be of interest for other applications, as well.     

水性紫外光木器涂料的研制

以水性UV丙烯酸酯树脂、水性UV脂肪族聚氨酯丙烯酸酯树脂为基料制备成水性紫外光木器涂料,经检测,水性UV涂装性能上大大得到改善,气味比普通UV涂料低、硬度比水性木器涂料高、表面效果与施工方法得到有效的改善,解决了水性木器、UV光固化涂料在喷涂技术领域遇到的技术瓶颈。     

应用于塑料和涂料中的有机颜料

在生产塑料时,选择正确的颜料取决于颜料的分散能力,迁移特性,热稳定性,光稳定性以及价格。这些性能与颜料的浓度,塑料的厚度,助剂的使用有很大的关系。当颜荆粉末与高分子树脂混合,在溶剂中高速分散,制成涂料。所有的涂料者含有四个主要成分：颜料、高分子/树脂连接剂、溶剂、助剂。此文阐述有机颜料在塑料与涂料中的性能并且总合其在商业上的一些应用。