Coating classification: self repairing coating

Core tip: Introduction: The surface function of materials and products widely used by people mostly depends on the function of coating Conductive coating, insulating coating, heat-resistant coating, anticorrosive coating, anticorrosive coating, antifouling coating, invisible coating and other functional coatings have long been used in commercial products and military products Self repairing coatings refresh the recent research and development of coating products, which have great value and good prospects in application Self repairing coating is the name of intelligent coating, which was put forward in 1990s It often means that the coating has self repairing function after being damaged, or has self repairing function under certain conditions 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 Introduction: the surface function of widely used materials and products mostly depends on the function of coating Conductive coating, insulating coating, heat-resistant coating, anticorrosive coating, anticorrosive coating, antifouling coating, invisible coating and other functional coatings have long been used in commercial products and military products Self repairing coatings refresh the recent research and development of coating products, which have great value and good prospects in application Self repairing coating is a kind of intelligent coating, which was put forward in 1990s It often refers to the organic polymer coating with self repairing function after the coating is damaged, or with self repairing function under certain conditions As a result of the mechanical and chemical damage to the film, there are several situations as follows: the surface of the film is damaged (such as scratch), the gap reaching the metal surface of the substrate, large area of delamination, discoloration, microcrack (also known as craze in Polymer Physics) In order to have self repairing function for these damages under different conditions, new requirements are undoubtedly put forward for the design of coatings Due to the different damage conditions and principles, it is a challenge for the research and development of coating products In order to meet the self-healing function, the coating and self-healing function must have the following basic conditions and requirements: ① the coating body must contain mobile phase substances (repair reagents), which can be released during the repair process, and the repair reagents can only be released when the coating is damaged or needed; ② When repairing some damages, such as cracks and scratches, in order to help fill in new materials, it often depends on some external repair reagents (such as moisture, oxygen, etc.); ③ the repair process needs a certain time under no load condition; ④ In order to help the release rate and amount of the repair agent in the film and shorten the repair time, external energy is often required, such as local heating, ultraviolet light or high-speed kinetic energy impact, etc.; ⑤ the test method for the cause of damage and the activation method for starting the repair are also needed Classification: from different perspectives, self repairing coatings can be divided into the following types: ① from the basic structure of the coating, there can be the auxiliary type of the phase separation structure and the intrinsic type of the continuous phase structure; ② based on the basic composition of the coating, in the auxiliary type of the phase separation coating, there are encapsulation, fiber filler, layered expansion filler, nano kaolin type; ③ From the perspective of repair mechanism, there are liquid release type, chemical reaction type, volume expansion type, reversible covalent bond type, reversible non covalent bond type and reversible polymer network type, etc.; ④ from the perspective of function, there are appearance repair function, anticorrosion function repair coating, etc Main properties: preparation process: Development Prospect: at present, the development of self-healing coatings focuses on the repair of macro cracks and micro cracks, that is, appearance repair and anti-corrosion performance repair However, it has been noticed in other repair functions, such as surface hydrophobic repair and adhesive repair between coating and substrate If the good adhesion between coating and substrate can be maintained all the time, the anti-corrosion performance will be greatly improved However, due to the extremely complex corrosion factors, it will bring difficulties to the development of products, but it is also in progress In addition, there is a very high degree of repair function that is interesting, that is, color repair, which involves optical knowledge, pigments, additives, resin points and other factors 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,