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CN-122011893-A - Composite anti-corrosion fireproof dual-functional steel structure coating and preparation method thereof

CN122011893ACN 122011893 ACN122011893 ACN 122011893ACN-122011893-A

Abstract

The invention discloses a composite anti-corrosion fireproof dual-function steel structure coating and a preparation method thereof, and relates to the technical field of fireproof coatings. The composite anti-corrosion fireproof dual-function steel structure coating comprises, by weight, 35-40 parts of silicon modified epoxy resin, 4-6 parts of nano reinforcing materials, 0.8-1.2 parts of dispersing agents, 8-10 parts of phosphorus-nitrogen-carbon flame retardants, 3-5 parts of corrosion inhibitors, 1-2 parts of silane coupling agents, 0.5-1.0 parts of rheological agents, 12-15 parts of polyamide curing agents and 20-30 parts of xylenes, wherein the composite anti-corrosion fireproof dual-function steel structure coating prepared by the invention has excellent impact resistance, flame resistance, salt resistance and adhesive force.

Inventors

  • HU MINFAN
  • FAN HAIYING
  • LIAO YOUWEI
  • FAN SHI

Assignees

  • 长沙民德消防工程涂料有限公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (10)

  1. 1. The composite corrosion-resistant fireproof dual-functional steel structure coating is characterized by comprising, by weight, 35-40 parts of silicon modified epoxy resin, 4-6 parts of nano reinforcing material, 0.8-1.2 parts of dispersing agent, 8-10 parts of phosphorus-nitrogen-carbon flame retardant, 3-5 parts of corrosion inhibitor, 1-2 parts of silane coupling agent, 0.5-1.0 part of rheological agent, 12-15 parts of polyamide curing agent and 20-30 parts of dimethylbenzene; the structural formula of the corrosion inhibitor is as follows: ; the structural formula of the dispersing agent is as follows: 。
  2. 2. The composite corrosion-resistant fireproof dual-function steel structure coating according to claim 1, wherein the nano reinforcing material is composed of 2-4 parts by weight of graphene oxide and 2-3 parts by weight of nano zinc oxide.
  3. 3. The composite corrosion-resistant fireproof dual-function steel structure coating according to claim 1, wherein the phosphorus-nitrogen-carbon flame retardant is compounded by ammonium polyphosphate, melamine and pentaerythritol according to a mass ratio of 5:3:2.
  4. 4. The composite corrosion-resistant fireproof dual-function steel structure coating according to claim 1, wherein the silane coupling agent is gamma-aminopropyl triethoxysilane, and the rheological agent is fumed silica.
  5. 5. The composite corrosion-resistant and fire-resistant dual-function steel structure coating according to claim 1, wherein the corrosion-resistant agent is prepared by the following method: S1, N2, N6-bis (4- (hydroxymethyl) benzyl) pyridine-2, 6-dimethylformamide reacts with 3- (2-perfluorohexylethoxy) -1, 2-epoxypropane to generate an intermediate 1, S2, reacting the intermediate 1 with 3- (3- (3-chloropropoxy) propoxy) propionic acid to generate an intermediate 2, S3, reacting the intermediate 2 with (2-mercaptoethyl) phosphonic acid to generate the corrosion inhibitor.
  6. 6. The composite corrosion-resistant fireproof dual-function steel structure coating according to claim 1, wherein the dispersing agent is prepared by the following method: 1,1,3,3,5,5,7,7,9,9,11,11,13,13-tetradecylthiosiloxane is reacted with tetraethylene glycol monoallyl ether to form a dispersant.
  7. 7. The composite corrosion-resistant fireproof dual-function steel structure coating according to claim 5, wherein in the step S1, the feeding mole ratio of N2, N6-bis (4- (hydroxymethyl) benzyl) pyridine-2, 6-dicarboxamide to 3- (2-perfluorohexylethoxy) -1, 2-epoxypropane is 1:2.05.
  8. 8. The composite corrosion-resistant fireproof dual-function steel structure coating according to claim 5, wherein in the step S2, the feeding mole ratio of the intermediate 1 to 3- (3- (3-chloropropoxy) propoxy) propionic acid is 1:2.03, and in the step S3, the feeding mole ratio of the intermediate 2 to (2-mercaptoethyl) phosphonic acid is 1:2.08.
  9. 9. The composite corrosion-resistant fireproof dual-functional steel structure coating according to claim 6, wherein the feeding mole ratio of 1,1,3,3,5,5,7,7,9,9,11,11,13,13-tetradecyl heptasiloxane to tetraethylene glycol monoallyl ether is 1 (2.02-2.05).
  10. 10. A method for preparing the composite anti-corrosion fireproof dual-function steel structure coating as claimed in any one of claims 1 to 9, which comprises the following steps: (1) According to weight portion, the epoxy resin comprises 35-40 portions of silicon modified epoxy resin, 4-6 portions of nano reinforcing material, 0.8-1.2 portions of dispersing agent, 8-10 portions of phosphorus-nitrogen-carbon flame retardant, 3-5 portions of corrosion inhibitor, 1-2 portions of silane coupling agent, 0.5-1.0 portion of rheological agent, 12-15 portions of polyamide curing agent and 20-30 portions of dimethylbenzene; (2) Adding nano reinforcing material into silicon modified epoxy resin, stirring, mixing uniformly, adding dispersing agent, stirring and ultrasonic dispersing, sequentially adding phosphorus-nitrogen-carbon flame retardant, corrosion-resisting agent, silane coupling agent and rheological agent, stirring, mixing uniformly, adding polyamide curing agent and dimethylbenzene, stirring, mixing uniformly, standing and curing to obtain the invented product.

Description

Composite anti-corrosion fireproof dual-functional steel structure coating and preparation method thereof Technical Field The invention relates to the technical field of fireproof coatings, in particular to a composite anti-corrosion fireproof dual-function steel structure coating and a preparation method thereof. Background The steel structure is used as an important material in the field of modern buildings, has the advantages of high strength, stable performance, good toughness, convenient processing and easy mass production, and is particularly suitable for the construction of large-span, ultrahigh or super-heavy buildings. However, in practical applications, steel structures are susceptible to corrosion caused by environmental factors, such as automobile exhaust in urban atmosphere, industrial flue gas, salt spray corrosion in seashore areas, and hot and humid climates in south areas, and these corrosive media can lead to oxidation of the steel surfaces and reduced strength, thereby shortening the structural life. In addition, the steel structure has weaker performance under the fire condition, and has high heat conduction coefficient, so that the temperature rises rapidly in the fire, the strength drops sharply along with the temperature rise, and the collapse of the structure can be caused. Therefore, the application of fire-retardant coatings is critical, the main purpose being to provide adequate escape time in the event of a fire, and to delay the rise in temperature of the steel by means of a thermal insulation or expansion mechanism. At present, steel structure fireproof coatings are mainly divided into organic type, inorganic type and semi-inorganic type, wherein the organic type is based on polymer or resin, but the whole fireproof performance needs to be further optimized. In the prior art, the anti-corrosion coating and the fireproof coating are often used independently, so that the coating system needs to be overlapped in multiple layers, for example, an anti-corrosion layer is firstly applied and then a fireproof layer is covered, the construction complexity and the cost are increased, and the integral protection effect is possibly influenced due to poor interlayer compatibility. For example, the traditional thick steel structure fireproof coating is mainly made of inorganic mineral heat insulation materials, but has limited corrosion resistance, and the phosphorus-nitrogen expansion fireproof coating has certain fireproof efficacy, but has defects in outdoor weather resistance and corrosion resistance. In addition, the existing dual-function coating still needs to be improved in adhesion and durability to meet the comprehensive requirements of modern buildings on performance, beauty and environmental protection. The Chinese patent publication No. CN111826047A discloses a fireproof and anticorrosive paint for steel structures and a preparation method thereof, wherein the fireproof and anticorrosive paint is prepared by mixing acrylic resin, aqueous polyester resin, ammonium polyphosphate, melamine, pentaerythritol, expanded perlite, decabromodiphenylethane, silicon stannate, zinc phosphate, aluminum tripolyphosphate, nano zinc oxide, mica iron oxide, heavy calcium carbonate, organic bentonite, fumed silica and an auxiliary agent. Disclosure of Invention Aiming at the defects existing in the prior art, the invention aims to provide a composite anti-corrosion fireproof dual-function steel structure coating and a preparation method thereof. In order to achieve the above object, the present invention is realized by the following technical scheme: The composite anticorrosive fireproof dual-functional steel structure coating comprises, by weight, 35-40 parts of silicon modified epoxy resin, 4-6 parts of nano reinforcing material, 0.8-1.2 parts of dispersing agent, 8-10 parts of phosphorus-nitrogen-carbon flame retardant, 3-5 parts of corrosion inhibitor, 1-2 parts of silane coupling agent, 0.5-1.0 part of rheological agent, 12-15 parts of polyamide curing agent and 20-30 parts of dimethylbenzene; the structural formula of the corrosion inhibitor is as follows: ; the structural formula of the dispersing agent is as follows: 。 The nano reinforcing material consists of 2-4 parts by weight of graphene oxide and 2-3 parts by weight of nano zinc oxide. The phosphorus-nitrogen-carbon flame retardant is prepared by compounding ammonium polyphosphate, melamine and pentaerythritol according to a mass ratio of 5:3:2. The silane coupling agent is gamma-aminopropyl triethoxy silane, and the rheological agent is fumed silica. The corrosion inhibitor is prepared by the following method: S1, N2, N6-bis (4- (hydroxymethyl) benzyl) pyridine-2, 6-dimethylformamide reacts with 3- (2-perfluorohexylethoxy) -1, 2-epoxypropane to generate an intermediate 1, S2, reacting the intermediate 1 with 3- (3- (3-chloropropoxy) propoxy) propionic acid to generate an intermediate 2, S3, reacting the intermediate 2 with (2-mercapt