Delayed combustion-retarding high temperature-resistant workshop primer and preparation method thereof

Abstract

The invention discloses a delayed combustion-retarding high temperature-resistant workshop primer and a preparation method thereof. The workshop primer is prepared from a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight: 20-80 parts of polyethyl silicate Si-40, 20-80 parts of organic solvent, 1-10 parts of deionized water and 0.5-5 parts of concentrated acid; the component B is prepared from the following raw materials in parts by weight: 15-20 parts of organic solvent, 2-5 parts of polyvinyl acetal, 0-8 parts of alcohol-soluble organic silicon resin, 1-6 parts of epoxy resin, 10-30 parts of delayed combustion-retarding agent, 1-5 parts of coating auxiliaries, 4-8 parts of ferrophosphorous powder with the granularity of 1000-1500 meshes and 20-40 parts of zinc powder with the granularity of 1000-1500 meshes; the ratio of the component A to the component B in parts by weight is (15-90):100. The heat-resistant temperature of the coating obtained by the primer can achieve more than 800DEG C, the burning loss area is extremely small, and smoke is not almost generated during the cutting or welding process.

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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