Coating composition used for steel plates with weatherability and preparation method thereof

Abstract

The invention discloses a coating composition used for steel plates with weatherability and a preparation method thereof. The coating composition comprises the following components by weight percent: 30-50% of organosilicone modified polyester resin, 20-46% of fillers, 1-2% of a siloxane coupling agent, 0.5-1% of phthalic ester and 1-48.5% of a xylene solvent. The coating composition is prepared by mainly using the organosilicone modified polyester resin as a coating base material, then mixing the organosilicone modified polyester resin with auxiliary materials including the fillers, the siloxane coupling agent, phthalic ester and the xylene solvent and grinding the mixture into a paste with a ball mill, wherein the fineness of the paste is 10-20mu m. During actual use, as the organosilicone modified polyester resin has excellent high temperature resistance, a coating formed by the organosilicone modified polyester resin has good properties, can be sprayed onto the surfaces of metals, such as iron, aluminium or stainless steel, and is widely applied to heat resistant materials in a high temperature working condition for a long term, such as petroleum refining furnaces, aluminium refining furnaces, engine exhaust systems and motor vehicle mufflers.

Description

technical field [0001] The invention belongs to the field of coating of metal materials, in particular to a coating composition for weather-resistant steel plates and a preparation method thereof. Background technique [0002] The coating on the metal can not only protect and beautify the appearance of the metal, such as anti-rust and coloring, but sometimes, the coating can also be used to achieve some special functions, such as improving lubrication and deep drawing performance. In the actual application process, the effect of the coating is closely related to the coating. Taking heat-resistant coatings as an example, heat-resistant coatings mean that the coating film can be maintained at high temperature (generally above 150°C) for a long time without cracking, with little yellowing and falling off, and can maintain appropriate physical properties and protective functions. , the existing patent document CN1583912 (coil primer coating and its preparation method, 2005.02.2...

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Problems solved by technology

[0003] With the advancement of technology, it is found that silicone resin also has better heat resistance. The basic skeleton of silicone resin is the main chain of Si-O, which has higher bond energy than the C-C bond of ordinary polymers. Heat resistance and anti-oxidation are also strong. Normally, the heat resistance temperature of silicone resin is 300°C. It has been proved by practice that in addition to heat resistance, silicone resin also shows excellent weather resistance and stain resistance. , water removal, cold resistance and chemical corrosion resistance, etc., but in actual use, there are still the following problems, such as: need high temperature curing (above 250 ℃) and long curing time, difficult large-scale construction, adhesion to metal Poor, poor solvent resistance and high production cost, for this reason, we must find a high-performance material that can replace silicone resin, and at the same time, it also needs to have higher heat resistance than the existing polyester resin or epoxy resin

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