Eco-friendly zero VOC anticorrosive paints for steel protection

With the growth of the green movement, it is important to prepare environmentally friendly anticorrosive paints to save lot of money, which are lost each year because of corrosion. High molecular weight organic corrosion inhibitor (safe adduct), barrier anticorrosive pigment (safe) and convertible anticorrosive pigment (toxic) are protective elements in paint formulations. Emulsification of the prepared adduct was the way to be applicable in water-borne paints, using mixture of emulsifiers. Surface tension measurements using ring method technique and thermal stability test could characterize the prepared emulsion systems. It was interesting to study the performance of the protective elements in water paint formulations based on short oil water thinned alkyd. Physical and mechanical properties of dry paint films, corrosion tests of the coated steel, water up-take% of the prepared paints, weight loss of steel under paint films after immersion in artificial sea water and corrosion inhibition efficiency of the protective elements were determined. Comparative studies of the protective elements in water-borne paints have been done according to performance, economic feasibility and environmental safety. It was found that zinc chromate as carcinogenic anticorrosive pigment could be replaced by 0.09% of the prepared water-borne corrosion inhibitor (MTDT adduct), 20% micaceous iron oxide (MIO) or their blend. Superior corrosion inhibition efficiency of steel was obtained in case of using MTDT/MIO blend. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

High performance water-based paints with non-toxic anticorrosive pigments

Legal restrictions have impelled the replacement of solvent-borne resins and of toxic chromates and lead-bearing pigments in the elaboration of paints. Water-based anticorrosive paints have come a long way to improve their efficiency but their behaviour is said to be poorer than that of solvent-based paints. Nevertheless, recent advances in water-borne technologies have now resulted in improved resin systems that may be employed to produce heavy-duty coatings.

The objective of this paper is to formulate high performance water-borne paints pigmented with non-toxic phosphate inhibitors. The anticorrosive properties of the paints were evaluated by accelerated tests (salt spray and humidity cabinets) and electrochemical tests (electrochemical impedance spectroscopy, EIS). The anticorrosive properties of the pigments were also evaluated by electrochemical tests.

It was found that it is possible to formulate high performance anticorrosive paints by selecting adequate water-borne resins and ecological pigments.     

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.     

Study of formulation variables of thermoplastic reflecting materials for traffic marking

Nine formulations of thermoplastic materials for traffic marking were prepared using a resin based on maleic anhydride modified with rosin in different proportions (18, 22, and 26%). A liquid coconut long oil alkyd resin (100% solids) was employed as a plasticizer. Titanium dioxide was used as a hiding pigment while calcium carbonate and micronized talc were used as extenders. Coarse marble powder facilitated the incorporation of glass beads. The operation was made by employing a double Z mixer heated with oil to obtain a mass temperature of 180–190°C. The mixer was equipped with two asynchronous arms rotating at 46 rpm. Dry and wet abrasion tests were carried out and the results obtained indicated that wearing values are three times greater in the case wet test. It is demonstrated that plasticization degree controls hardness variation as a function of temperature; therefore, a critical point, which is the beginning of an abrupt reduction of hardness, is determined. Water absorption increases when the plasticizer content increases. A matrix correlation of tests results was used to analyze the obtained numeric values. Centro de Investigación y Desarrollo en Tecnología de Pinturas, (CIC-CONICET), Av. 52 e/121 y 122, (1900) La Plata, Argentina. OSCAR SLUTZKY studied chemistry at the Universidad Nacional de la Plata, where he graduated in 1955. Immediately after graduation, he worked in the chemical industry as a Process Chemist. For 20 years Dr. Slutsky was a Process Master Chemist in the Nylon Technical Division of DuPoint in Argentina. In 1982, he was appointed by CONICET to work at CIDEPINT, where he carries out research work on paints and polymeric materials. Dr. Slutzky is author of numerous papers in specialized publications. JORGE MEDA studied at the Industrial School where he obtained a Chemical Technicana Degree in 1957. Immediately following graduation, he worked at the Argentinian National Atomic Energy Center. In 1977, he joined CIDEPINT. At present, Mr. Meda works on paint and computation models at CONICET. JUAN J. CAPRARI studied at the Universidad Tecnológica de la Plata (Argentina) where he graduated as a Chemical Engineer in 1966. Immediately following graduation, Eng. Caprari started working on paints at CIDEPINT. He was awarded with the Horacio Damianvoich prize of the Argentina Chemist Association. He is author of numerous publications on protection by paints, surface preparation and finishing, and paint application. In 1979, he received a fellowship from the Spain Scientific Research Council to do research on paints and cathodic corrosion at the Centro Nacional de Investigaciones Metalúrgicas (CENIM) in Spain. At present, he is head of the Paint Film Properties Area of the CIDEPINT and member of the scientific research career of CONICET. ALBERTO C. AZNAR studied at the Universidad Tecnológica de la Plata (Argentina) where he graduated as a Chemical Engineer in 1978. Immediately following graduation, Eng. Aznar started working on paints at CIDEPINT. His research is related to paints in general, and since 1983 he had been working with thermoplastic materials for traffic marking. Eng. Aznar also studies polymeric substances and resins. He is author of numeous papers published in specialized journals.     

塑料制品水性涂料的发展

随着人们环保意识的增强,开发塑料制品水性涂料将取代溶剂型涂料。水性涂料作为一种环保型涂饰材料,具有广阔的应用前景。综述了水性丙烯酸、水性聚氨酯和UV固化等主要的塑料用水性涂料的发展现状、性能特点和应用范围,并提出了其今后的发展方向。     

水性丙烯酸道路标线涂料的发展历史和优势

主要论述了水性丙烯酸道路标线涂料的发展历史,以及在道路交通安全、环境保护、施工人员的身体健康方面的优势。通过一系列的路试试验进一步阐述了水性丙烯酸道路标线涂料在交通安全,特别在夜晚和雨夜的交通安全反光性能中的重要功能。     

纳米化聚丙烯酸系乳液在水性木器涂料中的应用

介绍水性木器涂料用树脂的类型、存在的主要问题以及水性丙烯酸乳液木器涂料的新进展。采用纳米化丙烯酸系乳液为基本成膜物质、并配以各种助剂,得到室温自交联水性木器涂料,其可挥发性有机物含量远远低于国家相关标准,漆膜硬度、柔韧性、耐水等性能优异。     

Air-drying high solids alkyd pants for decorative coatings

The restrictions on the emission of solvents in paints makes the need for environmentally-friendly systems still more important. For industrial applications, powder coatings and water-borne systems are the most attractive alternatives and are already in use. For architectural purposes there is a minimum acceptance of water-borne systems (except wall paints). In this application high solids are becoming more and more accepted as an alternative to traditional systems, not only because of their environmental effects but also for their technical performance and economical benefits.     

水性仿古漆——重塑木材自然气质的涂装工艺

水性仿古漆(水性擦拭型着色剂)在水性木器涂料涂装工艺中能塑造出木材自然的纹理气质,可同目前的溶剂型涂料涂装效果相媲美。     

水性木器封闭底漆的配方探讨

为了解决水性木器色漆涂膜快速变色的问题,使用水性封闭底漆是一种简单有效的方法。测试了封闭底漆中不同水性成膜物、助溶剂、底材润湿剂对封闭性能的影响,探讨了水性木器涂料变色的原因。     

Nanoparticles as antifungal additives for indoor water borne paints

There are nanotechnology-based materials that can be used as antimicrobial additives in different applications such as water-borne paints. Antimicrobial paints are important tool in order to avoid indoor biological colonization and therefore prevent paint bio-deterioration and health problems in people and pets. These paints would have application in kitchens, bathrooms and hospitals. The present study evaluated the incorporation of silver (of two different sizes), copper and zinc oxide nanoparticles in indoor waterborne paints and the bio-resistance imparted by them. The antifungal activity of nanoparticles is a less studied topic in relation to the antibacterial activity but is no less important from the environmental point of view. Molds that grow in indoor environments contribute significantly with bioaerosol formation and therefore on air contamination and human health deterioration. In this sense, this research evaluated the nanoparticles’ antifungal activity using previously isolated fungi, Chaetomium globosum and Alternaria alternata, on solid medium. Then, the bio-resistance of acrylic paints, with nanoparticles incorporated, was evaluated in Petri dishes and observations were made using scanning electron microscopy. The better results were obtained with the paint that contained silver with the smaller size (10 nm).     

Progress of fluoropolymers on coating applications: Development of mineral spirit soluble polymer and aqueous dispersion

Fluoro-olefine vinyl ether copolymer (FEVE) has been well known as highly durable polymer for paints industry. FEVE has been widely used for ambient temperature curable solvent-borne paints. In this report, recent developments of FEVE copolymer are reported for mild-solvent paint system and water-borne paint system. Firstly, mineral spirit soluble FEVE copolymers are mentioned for both 1-component and crosslinkable 2-component mild-solvent paint systems. Secondly, FEVE aqueous dispersion polymers are mentioned for non-crosslinkable 1-component latex paint system, crosslinkable 2-component emulsion paint system with isocyanate as containing high OH value and for 1-component crosslinkable emulsion paint system containing carboxyl functionality reactive with hydrazide.     

Vitreous fillers in intumescent coatings

The introduction of vitreous fillers in some intumescent coatings compositions proved to be useful both in improvement of thermal insulation and durability of char under fire and in smoke emission characteristics. In this paper a comprehensive experimental study is presented showing results for solvent-borne, 2K epoxy and water-borne intumescent paints.

Blends of vitreous fillers with different melting temperatures, between 350°C and 850°C, have been tested together with refractory fillers (with melting temperatures between 1100°C and 1350°C). Lead free vitreous fillers with very low melting temperatures (from 350°C to 550°C) and with low water solubility were developed. Different types of paints have been prepared by adding different amounts of vitreous fillers. These compositions were then fire tested after application on steel plates. The effect of vitreous fillers on fire performance and stabilization of char (by means of encapsulation, with or without self-extinguishing additives) has been studied. The fillers’ effect on smoke emission under fire was also examined both in terms of optical density and toxicity index.

A special attention was focused on water-borne intumescent paints modified with vitreous fillers of different solubility and melting temperature. Residual solubility of the vitreous fillers, which appeared as a very important parameter for paint stability, has been assessed. Vitreous fillers releasing alkaline ions in such an amount to give a conductivity higher than 500 μS cm, make the intumescent paint composition unstable.     

Safflower oil utilization in surface coatings

The unique high linoleic acid content of 78% in safflower oil makes it especially suitable to the coatings industry. The high content of linoleic acid, low amount of saturated acids, and absence of linolenic acid constitutes an oil which forms fast-drying, nonyellowing films that have an excellent through dry and low wrinkling characteristics. More safflower oil is utilized in the manufacture of alkyd resins than any other single nonedible use. The oil alcoholizes rapidly with polyols and heat-bleaches to very ligh colors in cooking the alkyd resins. These alkyds have the best combination of fast-drying and nonyellowing properties of any drying oil alkyd of equal oil content. Heat-bodies safflower oil has uniform polymer structure as shown by its viscosity reduction curves. Heat-bodied and low viscosity safflower oils are used in exterior house paints. These paints show good through dry, low wrinkling and resistance to dew flatting. Specialty uses for safflower oil include urethane resins, caulks and putties, linoleum and oil emulsion exterior house paints. Presented at the AOCS Meeting, Cincinnati, October 1965.     

Polyvinyl chloride film local isometric heat treatment for hidden 3D printing on polymer packaging

A method of 3D embossed printing is proposed where both point and line images can be printed on rigid polyvinyl chloride (PVC) shrink films without any consumables, such as paints, primers, dampening solutions, or washes. Embossed lettering and symbols on packaging are intended for people with poor vision, but capable of tactile marking recognition and reading Braille. This 3D printing is based on reversible deformation and stress relaxation in anisotropic glassy polymers by local isometric heat treatment of thermoplastic films under pressure. Films can be protected from counterfeiting by hidden markings due to time separation of information recording onto the film and displaying this information for visual or tactile reading. The results quantify the rate of internal stress relaxation in PVC shrink films at various stages of 3D printing, including tactile sign formation conditions. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43046.     

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     

不同乳化剂对水性上光油的影响研究

利用小分子乳化剂OP-10、自乳化单体对苯乙烯磺酸钠、丙烯酸酯共聚树脂乳化剂制备纸品水性上光油。研究不同乳化剂对上光油乳液凝胶含量、粒径、黏度以及涂层光泽度、吸水率的影响。结果表明,使用自乳化单体对苯乙烯磺酸钠,提高了上光油涂层的耐水性;使用丙烯酸酯共聚树脂乳化剂可以制备凝胶含量低、粒径小、涂层光泽度高的水性上光油。     

水性不粘涂料的开发

对水性不粘涂料进行综述，并介绍了几种相关的配方。     

我国路面标线涂料的发展

我国的路面标线涂料主要是以Ｃ５ 石油树脂为基料的热熔型和以丙烯酸树脂为基料的常温溶剂型两种类型， 对两者的性能优劣作了分析比较， 并指出， 今后该涂料的高固体及水性化发展是必然趋势。     

Properties of calcined kaolins in anticorrosion paints depending on PVC,chemical composition and shape of particles

The properties of calcined kaolins in paints were identified in relation to their pigment volume concentration (PVC). The study involved three kinds of kaolin exhibiting different development of the lamellar structure of primary particles as well as different distribution of particle size. Kaolins also displayed varying contents of a glassy phase – mullite and quartz. Prepared model paints were formulated with the increasing content of kaolins, with PVC ranging from 5 to 40% up to a maximum critical pigment concentration (CPVC), i.e. up to a point where PVC = CPVC. The properties of paints were tested by means of laboratory corrosion tests in the environments of neutral salt mist and of condensed humidity. It was the aim of the study to identify the effect of kaolin's PVC on the mechanical and corrosion resistance of coatings based on water-borne epoxy resin.