Advantages of epoxy based coating in new coating technology

The world coating technology is changing from process type to design type In this process with the new characteristics of industrial technology progress in the 21st century, the epoxy resin based coating with excellent performance and environmental protection will become an important role Nowadays, the development of coating technology is in the process of transformation From the perspective of the development of coating technology, as early as the early 1960s, with the promulgation of the air cleaning law (66 regulations) on VOC emission control in the United States, and the similar regulations enforced by many European and American environmental protection bureaus, the reduction of VOC has been put on the main agenda of coating manufacturers in these countries As a result, four alternative technologies have been developed, namely, solvent based high solid coatings, water-based coatings, powder coatings and radiation curing coatings Among them, the radiation curing coating has been used on the scale of laboratory since the early 1970s, but its actual commercialization is quite late, which is due to the lack of attention to the development of appropriate UV curing channels The fast curing solventless epoxy coating based on bisphenol A epoxy resin has been known since 1960s, but the commercialization of this technology has been greatly delayed due to the lack of suitable construction equipment Therefore, it is very important to balance the emphasis of all aspects of technology to accelerate the process of technology commercialization in the future Organic-inorganic hybrid is an important content of new coating technology At present, the varieties of coating developed by organic-inorganic hybrid technology include: new generation of air dried carbon siloxane hybrid, such as epoxy polysiloxane, siloxane acrylic acid, siliconized emulsion, etc., which have outstanding durability and have been commercialized According to experts from China epoxy Industry Association, the most famous one is the engineering epoxy polysiloxane coating In the heavy duty anticorrosive coating system, unlike organic / inorganic zinc rich coatings, epoxy interlayer and polyurethane topcoat, the 3 systems are organic / inorganic zinc rich primers and epoxy polysiloxane topcoat 2 systems, which are superior to the former and lower VOC, reducing environmental pollution The emulsion system developed by hybrid technology is made of core shell emulsification and external emulsification Acrylic acid and alkyd, the air dry waterborne hybrid emulsion has double advantages of acrylic emulsion and alkyd emulsion, and can be used in the field of construction It has excellent properties, such as gloss, flow and leveling, brush ability and wettability Silicated emulsion is also a kind of hybrid emulsion, which is made from copolymerization of vinyl siloxane or its derivatives with acrylic monomers for penetration Exposed to wind and rain resistant concrete, masonry and silicate paint, which can be mixed with acrylic emulsion to make long-life silicate coatings for exterior walls It has 8 years of durability, excellent resistance to stain and wind and rain without sacrificing respiration Water repellent polysiloxane oligomer mixed with emulsion paint is used on the exterior wall of buildings, which has excellent water drop effect Epoxy polysiloxane coating has excellent stain resistance, which can be used as self polishing coating without organotin, and has a dominant position in the non-toxic antifouling paint market