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     

常温固化氟碳涂料的研究

以三氟氯乙烯-乙烯基化合物共聚物（亦称FEVE树脂）为基料,异氰酸酯HDI三聚体为固化剂制成常温固化型双组分氟碳涂料。该涂料具有一般氟树脂涂料的超长耐候性和耐温性、优良的耐化学介质腐蚀性、卓越的防污染、良好的机械性能以及品位典雅的装饰性能,同时具有一般涂料的溶解性、可常温固化性等。分析讨论了树脂的氟含量、主要助剂、固化剂、溶剂的选用对涂料主要性能的影响。     

Grafting. IV. Graft tercopolymers as antifouling resin

A graft tercopolymer CLR-g-(MMA–TBTMA) based on chlorinated rubber as the backbone and binary copolymer of methyl methacrylate and tributyltin methacrylate as grafted chains has been synthesized. This graft copolymer has been used for the formulation of controlled-release antifouling paints, and leaching rate behavior of toxin from such paints has been studied. The data have been compared with those obtained using controlled-release antifouling paint based on linear chain copolymer of methyl methacrylate and tributyltin methacrylate. The paint based on grafted copolymer is characterized by having a lower leaching rate and reduced time for attainment of steady-state leaching. Raft exposure studies indicate longer antifouling life compared to that of linear chain copolymer-based paint both having the same dry paint film thickness.     

醋酸乙烯-乙烯乳液用于低气味环境友好高性能涂料

介绍了醋酸乙烯-乙烯(VAE)乳液的技术基础,如VAE乳液的发展、合成技术、化学结构及性能优点。重点研究了在低VOC和低气味的环境友好内墙涂料中,VAE乳液与醋丙乳液、苯丙乳液对涂料性能的影响。结果表明:VAE乳液制备的涂料相对于使用低成膜温度的醋丙乳液涂料,具有更好的低温成膜性能和耐洗刷性能,并且在低PVC(颜料体积浓度)的涂料中具有更好的弹性;VAE乳液制备的涂料相对于低成膜温度的苯丙乳液,具有更好的对比率、低温成膜性和耐洗刷性。电子鼻分析仪的测试结果表明,VAE乳液制备的涂料比使用低气味苯丙乳液制备的涂料气味更低。     

Simple preparation of long-persistent luminescent paint with superhydrophobic anticorrosion efficiency from cellulose nanocrystals and an acrylic emulsion

Novel photoluminescent paint was prepared for safety marking purposes using an emulsion system composed of an acrylic polymer, cellulose nanocrystals and lanthanide-doped strontium aluminate (LdSA) nanopaticles. The effect of LdSA concentration in the paint formula was investigated. Cellulose nanocrystals (CNCs) have been an attractive reinforcement material that can be incorporated into protective coatings due to their distinctive properties, such as biocompatibility, biodegradability, and renewability. The produced acrylic/cellulose nanocrystals/lanthanide-doped strontium aluminate paints were applied onto different surfaces of asphalt concrete and tinplate panels. LdSA was developed in the nano-scale form as described by transmission electron microscope (TEM) to allow a better dispersion in the paint formula. The applied paints were studied by energy-dispersive X-ray spectroscopy (EDS), X-ray fluorescence (XRF), scan electron microscopy (SEM), and infrared spectra (FTIR). Both transparency and coloration measurements of the applied paints were investigated by luminescence spectra and CIE Lab. The resistance to scratching, hydrophobic and corrosion resistivity were investigated. CNCs were monitored to be a key component for the anti-corrosion activity. The best long-lived luminescence was monitored for more that 60 min in the dark for LdSA concentration of 12% w/w. The paints containing cellulose nanocrystals and sodium hexametaphosphate demonstrated satisfactory results upon mixing with acrylic emulsion.     

Radiometric studies of mercury loss from fungicidal paints III. Loss from three paints with various mercury contents

Losses of mercury have been measured over a period of 220 days from paint films prepared from polyvinyl acetate emulsion (PVA), styrene/acrylic emulsion or alkyd gloss paints containing concentrations of mercury as phenyl mercuric acetate (PMA) from 0.005 to 0.16%. At all concentrations, simple PVA films lose mercury at lower rates than do comparable films prepared from PVA containing coalescing agent, or from styrene/acrylic emulsion. Mercury losses from alkyd gloss films are lower than those from other films at the lower mercury concentrations studied, but percentage loss rates for alkyd films increase somewhat with increasing mercury concentration. A simple explanation for this difference is offered in terms of physical structures of the paint films.     

Development of hybrid antifouling paints

The objectives of this study are to measure the efficiency of a hybrid system for antifouling paint and to observe the influence of the physico-chemical properties of the binder on the antifouling activity. Poly(ɛ-caprolactone) (PCL) and poly(dimethylsiloxane) (PDMS) homopolymers are already used as binder for different antifouling strategies. The use of the block copolymer should allow to mix the properties of erosion and hydrophobicity to obtain a more efficient paint with a reduced environmental impact.Paints containing triblock copolymer were immersed in seawater in Lorient harbour to evaluate their antifouling activities. The water absorption, the degradation and the surface properties of the copolymer were measured in distilled water to understand the influence of the binder characteristics in the resulting antifouling properties.The hybrid paints have shown efficiency close to a commercial paint during their immersion in situ in spite of inadequate static conditions of test.     

常温固化FEVE氟碳涂料耐候性地区差异研究

通过自然老化试验和环境扫描电镜(ESEM),研究并比较了FEVE氟碳涂料和丙烯酸聚氨酯涂料在不同曝晒地区的耐候性差异.结果表明,FEVE氟碳涂料的耐候性远远优于丙烯酸聚氨酯涂料;FEVE氟碳涂料对湿热、盐雾环境较敏感,而对单纯强紫外线照射环境以及工业腐蚀环境不敏感.     

Novel water based coatings containing some conducting polymers nanoparticles (CPNs) as corrosion inhibitors

A new type of anticorrosive water-based paints containing some conducting polymers nanoparticles (CPNs) such as poly anisidine (PAns), poly toluidine (PTol) and their copolymer (CCPNs) have been prepared and evaluated. The CPNs and CCPNs have been synthesized via miniemulsion polymerization. The prepared materials have been characterized by GPC, FTIR, TEM and DSC. The prepared CPNs and CCPNs of different weight percentages (wt.%) have been incorporated into paint formulations. It has been found that the presence of the prepared CPNs and CCPNs in the paint formulations highly enhanced the resistance of the formed paint films against washability, weathering and corrosion.     

调湿抗菌内墙涂料的研制

以苯丙乳液与硅溶胶组成有机-无机复合基料，以硅藻土、高吸水性树脂、海泡石粉组成调湿材料，在非吸湿颜填料、负离子添加剂及助剂的配合下，制备成调湿抗茵内墙涂料。该涂料不但具有普通内墙涂料的一般物理性能，而且还具有调湿防结露功能，同时还能释放负离子、抑茵抗茵、祛除有害气体、清新空气，是一种新型环保、节能的内墙涂料。     

Performance of phosphate–alumina pigments in waterborne paints for protection of cold-rolled steel

Core–shell theory presents a new easy method to obtain high performance, economic, and eco-friendly anticorrosive mixed pigments. The core–shell pigments in this work are prepared by depositing a surface layer of an expensive efficient anticorrosive pigment (phosphates) on a bulk of less expensive extender pigment (alumina). The combination of these two compounds led to the production of new pigments with improved properties different from each of its individual components; and consequently these improved properties led to changing the efficiency of protection properties of paint films containing these new pigments. The new pigments were characterized using XRD, SEM, TEM, and EDAX analysis to elucidate their structure and prove the presence of phosphate ions on the surface of alumina. These pigments were also evaluated according to ASTM measurements. Then they were incorporated in three groups of emulsion paint formulations based on styrene acrylic emulsion copolymer, and comprising different concentrations of Zn, Mg, and 1Zn·1Mg phosphates/alumina core–shell pigments; in addition to a control formulation free of these pigments, to evaluate their efficiencies in anticorrosive paints for protection of cold-rolled steel. Chemical, physical, and mechanical measurements were carried out, besides corrosion resistance tests and weight loss of steel panels under paint films which were determined in 5% NaCl solution for 28 days. The results proved that the prepared formulations containing the prepared pigments could protect steel efficiently from corrosion compared to the control specimen. Groups II and III containing higher weight percentages of prepared pigments showed the best performance in corrosion protection, and the best performance among these two groups was paint films containing magnesium phosphate/alumina pigments.     

Environment-friendly paints: their technical (im)possibilities

In this paper technical (im)possibilities of environment-friendly paints are discussed from a paint developer's point of view. Special attention is paid to acrylic emulsion paints for wood protection. Important and interesting examples are given based on binder technology and paint formulations.     

超声乳化法制备TiO2/PMMA及其在乳胶漆中的影响

采用超声乳化法原位乳液聚合技术制备了聚甲基丙烯酸甲酯包覆的纳米TiO2(TiO2/PMMA),确定了超声乳化法原位乳液聚合合成TiO2/PMMA的工艺条件。制得的TiO2/PMMA应用于乳胶漆中,与未加TiO2/PMMA的同种乳胶漆比较,干膜硬度由2H提高到5H,耐洗刷性提高了1倍,自洁能力提高到1.6倍。扫描电镜照片显示,加了TiO2/PMMA的乳胶漆干膜中分散相粒子的团聚得到明显改善。     

Retention of some non-mercurial fungicides in paint films

The fungicides, 3,5-dimethyltetrahydro-1,3,5-thiadiazine-2-thione (DTTT) and 4-tolyldiiodomethylsulphone (TDMS) have been prepared labelled with ¹⁴C and incorporated into polyvinylacetate emulsion (PVA), styrene/acrylic emulsion (acrylic) or alkyd gloss (alkyd) paints. Test plates prepared from these paints have been exposed in both tropical and temperate conditions and losses of fungicides have been followed radiometrically. In outdoor conditions, DTTT is rapidly lost from all the paints. Indoors, DTTT is retained well (50% after 150 days) only by alkyd paint. TDMS is well retained in indoor conditions by all the paints. Outdoors however, retention in PVA and acrylic films is less than 50% after 150 days and is poorer in tropical conditions. About 90% of the TDMS is retained in alkyd films for an indefinite period in temperate conditions: in tropical conditions, 80% is retained after 150 days. Comparisons of losses from paint films of mercurial and non-mercurial fungicides show that TDMS is a satisfactory substitute for the more commonly used mercurials.     

阴极电泳涂料用微凝胶的合成及应用

通过两种方法合成含可交联型硅氧烷基团的微凝胶溶液，将微凝胶溶液作为添加剂应用到阴极电泳涂料中，可使涂料获得低颜基比、高防腐性能、高耐油污性等特性.     

Application of silica-containing nano-composite emulsion to wall paint: A new environmentally safe paint of high performance

A new emulsion-type paint was prepared by utilizing a nano-composite emulsion (NCE), which contained nano-size particles (ca. 60 nm in diameter) consisting of silica (inorganic core, ca. 30 nm in diameter) and polyacrylate (organic shell), and evaluated as wall paint. By applying NCE for the wall paint, about 35 wt.% of the organic content in the paint could be reduced in comparison with the commodity emulsion-type paint, which is highly effective to save the petroleum resources. The basic properties of the white NCE paint film on gloss, surface hardness, adhesion, and solvent resistance were evaluated and compared with those of acrylic emulsion-type paints as well as those of silica-containing paints which were prepared simply by blending the acrylic emulsion with silica sol. The NCE paint was especially excellent in solvent resistance. Then the practical tests were performed to evaluate its appropriateness as wall paint, which clarified the excellent antipollution property and the high flame resistance of the NCE paint.     

Fluorinated additives for stain-resistant matt latex paints

Latex paints are often preferred over solvent-based paints due to their good gloss and color retention, ease of handling, and lower volatile organic contents. However, matt latex paints tend to show poor stain resistance since they develop highly porous and rough surfaces. In recent years, matt latex paints have been improved in their stain resistance with resulting better cleanability, by adding hydrocarbon acrylic polymers and fluorine-containing compounds. In this work, we prepared fluorinated acrylic emulsions of the copolymer of butyl acrylate (BA) and perfluorobutylethylene (PFBE), which were introduced in latex paint compositions. The properties of the modified paints were evaluated by performing stain resistance tests with several domestic products. It was observed that they had good stain release properties, thus conferring good properties to the final painting system. They contain the self-cleaning behavior typical of fluorinated coatings, which have been proven by the decrease of their surface energies. Since the cleaning procedures of a matt paint film can also impart some gloss increase, the wet and dry burnishes were also evaluated. The results have shown improvements in stain resistance and cleanability of the modified matt latex paints with the maintenance of their stability and the coatings gloss as required.     

常温固化FEVE氟碳涂料耐候性研究

通过自然老化、人工加速老化、ESEM分析研究了不同类型FEVE氟碳涂料的耐候性。结果表明:FEVE氟碳涂料具有非常优异的耐候性;具有更大交替性的醚类单体和位阻型大单体合成的FEVE氟碳树脂具有更优异的耐候性。     

Rheological and curing behavior of aqueous ambient self‐crosslinkable polyacrylate emulsion

An aqueous ambient crosslinkable polymer acrylic (AACPA) emulsion was obtained by adding adipic acid dihydrazide (ADH) to the polyacrylate emulsion incorporating diacetone acrylamide (DAAM), and this emulsion was synthesized by two feeding materials methods. The AACPA emulsion and its paint film were characterized with rheological measurements, laser light scattering, Fourier transform infrared, torsional braid analysis (TBA), DTA, and so on. The results showed that AACPA emulsion was pseudoplastic fluid and pseudoplasticity increased with increasing of DAAM content. The results also showed that water resistance, solvent resistance, and thermotacky temperature of AACPA paint film increased with increasing of the content of DAAM. The results dealing with curing behavior of the paint film showed that adding organic swelling solvent and organic acid to the AACPA emulsion can accelerate the curing speed of the paint film. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

高光含氟外墙乳胶漆的研制

介绍了一种高光含氟外墙乳胶漆的研制方法,并从涂料各组分的角度阐述了润湿分散剂、增稠剂、顔填料、乳液等对光泽和其他性能的影响。筛选出高光含氟外墙乳胶漆所需的原材料,对含氟乳液的性能进行分析和概括,开发出成本低、性能好,用于建筑外墙的高光含氟外墙乳胶漆。多次优化配方,以实际检测和应用情况为基础,提供稳定性好、容易调色的外墙高光含氟乳胶漆生产配方。为研制高光、环保、高性能的建筑外墙用高光含氟外墙乳胶漆提供设计思路和理论依据。