Fire-resisting high-temperature-resistant shop primer and preparation method thereof

Abstract

The invention discloses a fire-resistant and high-temperature-resistant shop primer and a preparation method thereof. The shop primer is prepared from component A and component B, and the raw materials and parts by weight of component A are: 20-80 parts of polyethyl silicate Si-40, 20-80 parts of organic solvent, 1-10 parts of deionized water, 0.5-5 parts of concentrated acid; the raw materials and weight parts of component B are: 15-20 parts Organic solvent, 2-5 parts of polyvinyl acetal, 0-8 parts of alcohol-soluble silicone resin, 1-6 parts of epoxy resin, 10-30 parts of anti-burning agent, 1-5 parts of coating additive, 4- 8 parts of 1000-1500 mesh iron phosphorus powder, 20-40 parts of 1000-1500 mesh zinc powder; the weight ratio of the A component and the B component is 15-90:100. The heat resistance of the coating prepared by the primer reaches above 800° C., the burning area is very small, and almost no smoke is generated during cutting or welding.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a calcining-resistant and high-temperature-resistant shop primer and a preparation method thereof. Background technique [0002] Since the early 1950s, shop primers have been used as pretreatment primers for large steel structures such as super yachts and offshore oil drilling platforms. In order to adapt to the assembly line operation, the shop primer needs to meet the requirements of fast drying, excellent anti-rust performance, good weldability and mechanical properties. [0003] At present, the widely used shop primer is based on polyvinyl butyral and ethyl silicate hydrolyzate, which is a pre-painted primer compounded with zinc powder. The disadvantage is that the outdoor maintenance time is short (generally only 3 days). months), the burning area is large during thermal processing, and the area to be recoated is large. [0004] There is also an epoxy zinc-rich shop primer, which i...

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Problems solved by technology

[0003] At present, the widely used shop primer is based on polyvinyl butyral and ethyl silicate hydrolyzate, which is a pre-painted primer compounded with zinc powder. The disadvantage is that the outdoor maintenance time is short (generally only 3 days). months), the burning area is large during thermal processing, and the area to be recoated is large

[0004] There is also an epoxy zinc-rich shop primer, which is formulated from zinc powder, epoxy resin, polyamide curing agent, etc. It has a history of decades of development in China and is widely used in the shipbuilding industry; It has excellent cathodic protection anti-corrosion performance, mechanical wear resistance, heat resistance and small paint film burning surface during welding and cutting. If the thickness of the dry film is controlled at about 20 μm, it will not affect the welding process and welding quality of steel. impact, and can be matched with commonly used antirust paints and topcoats; however, this kind of shop primer contains more zinc powder. When performing thermal processing such as electric welding and cutting, the coating cannot withstand high temperatures, so it releases more Zinc oxide fumes can easily lead to "zinc fever" and threaten human health, and this coating also has a certain impact on cutting speed and quality

[0005] There is also a common shop primer in the prior art, but it is not heat-resistant and will vaporize above 400°C, so it needs to be repainted

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