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    Home > Coatings News > Paints and Coatings Market > Coating classification: phosphate modified acrylic system for waterborne anticorrosive coatings

    Coating classification: phosphate modified acrylic system for waterborne anticorrosive coatings

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: Product Introduction: With the increasing awareness of environmental protection and the restrictions of environmental regulations on volatile organic compounds (VOC) and harmful air pollutants (HAP), the world anti-corrosion coating industry is developing towards the direction of "green" while improving its performance The development of non-toxic, tasteless, nonflammable and low pollution environment-friendly coatings, such as water-based coatings, powder coatings and high solid coatings, has become the main research direction of anti-corrosion coatings Among them, acrylate polymer based water-based acrylic coating system is the most widely used Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Coating home news: Product Introduction: with the increasing awareness of environmental protection and the restriction of environmental protection laws and regulations on volatile organic compounds (VOC) and harmful air pollutants (HAP), the world anti-corrosion coating industry is rapidly developing towards the "green" direction while continuously improving performance The development of non-toxic, tasteless, nonflammable and low pollution environment-friendly coatings, such as water-based coatings, powder coatings and high solid coatings, has become the main research direction of anti-corrosion coatings Among them, acrylate polymer based water-based acrylic coating system is the most widely used The film forming material of waterborne acrylic coatings consists of monomers of butyl acrylate (BA), methacrylic acid (MAA) and styrene (St) It has good weatherability, corrosion resistance, stain resistance and light retention and color retention However, compared with solvent based coatings, the comprehensive properties of waterborne acrylic coatings are not ideal Therefore, the research on polymerization and modification of acrylic emulsion is strengthened It is of great significance to prepare metal anticorrosive coatings with excellent performance With the development of the coatings industry, phosphate esters, as an important functional monomer and surfactant, are increasingly used in the production of emulsion and coatings Anti corrosion mechanism: Although the addition of acrylic monomers in the polymerization process of waterborne acrylic resin has a great effect on improving the adhesion of the coating under the condition of dry film, in the humid environment, water molecules are easy to enter the interface between the metal and the coating, because the water and the carboxyl group on the acrylic acid have a strong association, which leads to the decrease of the force between the carboxyl group and the metal substrate surface, and the wet adhesion The anticorrosive property of the coating film will also decrease with the decrease of the coating The functional phosphate monomer is generally composed of a mixture of phosphate monoester, phosphate diester and a small amount of phosphate monomers Its function is to form a dense phosphate protective film between the phosphate group and the metal substrate, to passivate the metal surface, to prevent the contact between water molecules and other salt ions and metal, and to have a good anti rust effect At the same time, the phosphorus hydroxyl group in phosphate has strong chelating action with the surface of the metal substrate, thus forming a complex with the multivalent metal The polymer is firmly connected to the metal substrate in the form of covalent bond, and the adhesion force of the emulsion particles and the metal particles on the surface of the emulsion is enhanced, so that the antirust property of the coating is further enhanced Preparation method: phosphorus oxychloride and phenol are used as raw materials Lewis acid is commonly used as catalyst in this reaction The selectivity of the reaction was improved by controlling different temperature, molar ratio of reaction and using different catalytic system However, the operating conditions of phosphorus oxychloride are very strict, so it is necessary to slowly add alcohol and phenol into phosphorus oxychloride at low temperature; moreover, due to the toxicity and volatility of phosphorus oxychloride, the by-product hydrogen chloride corrosion is serious, and its application is limited Phosphorus trichloride and phenol are used as raw materials: since phosphorus trichloride is trivalent phosphorus, phosphite is obtained first, and then converted into phosphate by oxidation method, usually by liquid chlorine oxidation hydrolysis method There are many process steps in this method, which affect the yield; although the organic acid can obtain a higher yield, it needs to be carried out at low temperature, so it is difficult to industrialized production; due to the use of chlorine gas or liquid chlorine oxidation reaction in the reaction, hydrogen chloride by-products are produced, which seriously corrodes the equipment and is not conducive to green production Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,
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