At present, high temperature resistant coatings on the market are mainly inorganic high temperature resistant coatings and organic high temperature resistant coatings. Among them, inorganic high temperature resistant coatings mainly include ceramic coatings, silicate coatings, phosphate coatings and zinc-rich primers. Organic high temperature coatings mainly include fluororesin coatings, heterocyclic polymer coatings and silicone high temperature coatings. . Fluororesin coating The fluorocarbon coating refers to a coating material containing a fluororesin as a main film-forming substance, and is also called a fluorocarbon lacquer, a fluorine coating, a fluororesin coating, and the like. Among various coatings, fluororesin coatings have high electronegativity due to the introduction of fluorine elements, strong fluorocarbon bonds, and have particularly superior properties: weather resistance, heat resistance, low temperature resistance, and chemical resistance. Moreover, it has unique non-stickiness and low friction. Its core technology was born in DuPont in the United States in 1938. The physicochemical properties of fluororesin coatings were sensational in the global chemical industry. Silicone resin Silicone resin is most popular as a high temperature resistant coating film because the bond energy of the silicon oxide bond is as high as 443 kJ·mol-1, and the silicone resin has the following advantages: (1) Good thermal stability: The covalent bond energy of the Si-O bond is larger than the covalent bond energy of the common organic polymer CC bond, up to 443 kJ·mol-1, which increases the bond energy of the silicone polymer. stability. The CC bond in the ordinary polymer is thermally oxidized and easily broken into low molecular substances, and the atomic-linked hydrocarbon group in the silicone polymer is thermally oxidized to form a highly crosslinked, more stable Si-O-Si. The bond forms a Si-O chain protective layer, which reduces the influence on the interior of the polymer. (2) Oxidation resistance: In the Si-O bond, the difference in relative electronegativity between the silicon atom and the oxygen atom is large, so the Si-O bond has a large polarity and shields the oxidation of the attached hydrocarbon group. . (3) Special molecular structure: The basic structural unit of the silicone polymer (ie, the main chain) is composed of Si-O chain links, and the side chains are connected to various other organic groups through silicon atoms. The structure of a silicone product contains both "organic groups" and "inorganic structures". This special composition and molecular structure allows it to combine the properties of organic matter with the function of inorganic matter. Therefore, silicone resin has excellent weather resistance, heat resistance, gloss retention, acid rain resistance, stain resistance, moisture resistance, water repellency, electrical insulation, chemical stability, etc. Some varieties are also resistant to radiation and oil. Resistance to solvents and other characteristics. Research status At present, the research of high-temperature coatings first solves the problem of curing at room temperature of high-temperature coatings, so that it can form a film when cured under normal temperature conditions, and the performance against high temperature and corrosion is improved. Secondly, expand the performance of high-temperature coatings, such as temperature resistance and acid and alkali corrosion resistance. Once again, we must widen the temperature range and strive to achieve long-term high temperature protection between 800 °C and 1800 °C, or higher temperatures. Fiber optic waterfall lighting is a new creative lighting.It is un-replaceable because of its special design and lighting effect. Fiber Optic Waterfall,Fibre Optic Waterfall,Led Fiber Optic Curtain,Fiber Optic Wall Jiangxi Daishing POF Co.,Ltd , https://www.jxopticfibrelight.com
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Heat resistant coating classification
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