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CN-122011929-A - Solvent-free plasticizer-free spray-type metal anti-corrosion paint and preparation method thereof

CN122011929ACN 122011929 ACN122011929 ACN 122011929ACN-122011929-A

Abstract

The invention relates to the technical field of anticorrosive paint, in particular to solvent-free plasticizer-free spray-type metal anticorrosive paint and a preparation method thereof, wherein the preparation raw materials comprise, by weight, 40-60 parts of polysiloxane resin, 30-50 parts of reactive diluent, 0.3-1 part of epoxy silane coupling agent, 1-3 parts of amino silane coupling agent, 30-40 parts of silicon micropowder, 0.15-0.4 part of organotin, 1-3 parts of vinyl trimethoxy silane, 0.4-1.6 part of anti-aging agent, 0.1-0.5 part of polyamide wax and 0.3-0.8 part of organosilicon defoamer, and the provided product realizes high-solid low-viscosity by optimizing the matching and adding amount control of modified polysiloxane resin, reactive diluent and other raw materials, and ensures comprehensive properties such as adhesive force, mechanical property and the like while meeting the requirements of spray-coating construction.

Inventors

  • WANG SHUSHENG

Assignees

  • 上海牛元工贸有限公司

Dates

Publication Date
20260512
Application Date
20260304

Claims (10)

  1. 1. The solvent-free plasticizer-free spray-type metal anticorrosive paint is characterized by comprising, by weight, 40-60 parts of polysiloxane resin, 30-50 parts of reactive diluent, 0.3-1 part of epoxy silane coupling agent, 1-3 parts of amino silane coupling agent, 30-40 parts of silicon micropowder, 0.15-0.4 part of organotin, 1-3 parts of vinyl trimethoxy silane, 0.4-1.6 parts of anti-aging agent, 0.1-0.5 part of polyamide wax and 0.3-0.8 part of organosilicon defoamer; The reactive end group of the polysiloxane resin is alkoxy silicon group, the viscosity of the polysiloxane resin at 25 ℃ is 2000-10000 Pa.s, the reactive end group of the reactive diluent is alkoxy silicon group, and the viscosity of the reactive diluent at 25 ℃ is 100-200mPa.s.
  2. 2. The solvent-free and plasticizer-free spray-type metal anticorrosive paint according to claim 1, wherein the metal anticorrosive paint is prepared from, by weight, 50-55 parts of polysiloxane resin, 33-43 parts of reactive diluent, 0.5-0.8 part of epoxy silane coupling agent, 1.5-2 parts of aminosilane coupling agent, 35-38 parts of silica micropowder, 0.2-0.25 part of organotin, 1.8-2 parts of vinyl trimethoxysilane, 1-1.2 parts of anti-aging agent, 0.2-0.3 part of polyamide wax and 0.5-0.6 part of organosilicon defoamer.
  3. 3. The solvent-free and plasticizer-free spray-type metal anticorrosive coating of claim 1 wherein the epoxy silane coupling agent comprises at least one of 3-glycidoxypropyl trimethoxysilane, 3-glycidoxypropyl triethoxysilane, or 2- (3, 4-epoxycyclohexyl) ethyl trimethoxysilane.
  4. 4. The solvent-free and plasticizer-free spray-type metal anticorrosive coating of claim 1 wherein the aminosilane coupling agent comprises N-beta-aminoethyl-gamma-aminopropyl trimethoxysilane and aminopolymersilane.
  5. 5. The solvent-free and plasticizer-free spray-type metal anticorrosive paint according to claim 3, wherein the mass ratio of the N-beta-aminoethyl-gamma-aminopropyl trimethoxysilane to the aminopolymersilane is 1-2:0.5-1.
  6. 6. The solvent-free and plasticizer-free spray-type metal anticorrosive paint according to claim 1, wherein the particle size of the fine silica powder is 2000-3000 mesh.
  7. 7. The solvent-free and plasticizer-free spray-type metal anticorrosive coating of claim 1, wherein the anti-aging agent comprises UV-328 and UV-770.
  8. 8. The solvent-free and plasticizer-free spray-type metal anticorrosive paint according to claim 7, wherein the mass ratio of UV-328 to UV-770 is 0.4-0.8:0.4-0.8.
  9. 9. The solvent-free, plasticizer-free spray-type metal anticorrosive coating of claim 1 wherein the organotin comprises dibutyltin dilaurate.
  10. 10. A method of preparing a solvent-free, plasticizer-free spray-type metallic anti-corrosive coating as claimed in any one of claims 1 to 9, comprising the steps of: stirring and dispersing polysiloxane resin, vinyl trimethoxy silane, an anti-aging agent, an epoxy silane coupling agent, polyamide wax and an active diluent, adding filler for vacuum dispersion, adding organic tin, an amino silane coupling agent and a defoaming agent for vacuum stirring, and filling after the detection is qualified.

Description

Solvent-free plasticizer-free spray-type metal anti-corrosion paint and preparation method thereof Technical Field The invention relates to the technical field of anti-corrosion paint, in particular to solvent-free plasticizer-free spray-type metal anti-corrosion paint and a preparation method thereof. Background The traditional solvent-based paint can flexibly adjust the proportion of the solvent to meet different construction modes, but the performance of the obtained coating is required to be further improved and does not meet the increasingly severe environmental protection requirements. The spray application requires that the coating have a suitable viscosity for good atomization. Too high a viscosity can lead to poor atomization and uneven paint film, and too low a viscosity can easily sag. It is extremely difficult to achieve the low viscosity required for spraying without solvent dilution. In order to reduce the viscosity of a solvent-free coating system, a reactive diluent is usually added, but the addition of the reactive diluent affects the crosslinking density, further affects the hardness and chemical resistance, chinese patent (publication No. CN 113174188A) discloses a high-solid-content rust-free anti-corrosion coating for metals and a preparation method thereof, and the anti-corrosion performance and the wear resistance of the coating are improved through the combination of oil-soluble resin, functional ceramic filler, reactive small molecules and the like, but an organic solvent is still needed, and the comprehensive performance of the product needs to be further improved. Chinese patent application (publication No. CN 121108843A) discloses a multifunctional long-acting anti-corrosive paint and a preparation method thereof, wherein high-activity epoxy resin and flexible resin are compounded, polyaniline, a gas-phase rust inhibitor and a benzotriazole rust inhibitor are doped in a combined manner, and an Ess rust-proof microcapsule is added, so that compactness is improved, corrosion resistance and adhesive force are improved, but brittleness of a product is high, and weather resistance is required to be further improved. Disclosure of Invention The invention provides a solvent-free plasticizer-free spray-type metal anti-corrosion coating and a preparation method thereof, wherein the combination of modified polysiloxane resin, reactive diluent and other raw materials and the control of addition amount are optimized, so that the provided product realizes high solid and low viscosity, and the comprehensive properties such as adhesive force, mechanical property and the like are ensured while the spray-coating construction requirement is met. The invention provides a solvent-free plasticizer-free spray-type metal anti-corrosion coating, which comprises, by weight, 40-60 parts of polysiloxane resin, 30-50 parts of reactive diluent, 0.3-1 part of epoxy silane coupling agent, 1-3 parts of aminosilane coupling agent, 30-40 parts of silicon micropowder, 0.15-0.4 part of organotin, 1-3 parts of vinyltrimethoxysilane, 0.4-1.6 parts of anti-aging agent, 0.1-0.5 part of polyamide wax, 0.3-0.8 part of organosilicon defoamer, wherein the reactive end group of the polysiloxane resin is alkoxy silicon, the viscosity of the polysiloxane resin at 25 ℃ is 2000-10000 Pa.s, the reactive end group of the reactive diluent is alkoxy silicon, and the viscosity of the reactive diluent at 25 ℃ is 100-200mPa.s. In order to make the provided products meet the requirements of spraying application, the viscosity is reduced by introducing a solvent in the early stage based on a polysiloxane resin system with high addition amount, but pores are formed after the solvent volatilizes, so that the adhesive force and weather resistance are reduced. The invention further reduces viscosity by incorporating plasticizers, but results in reduced adhesion and chemical resistance. According to the invention, through the discovery in the further research process, the reactive diluent with the reactive end group of alkoxy silicon group and the viscosity of 100-200mPa.s at 25 ℃ is introduced into the solvent-free coating system, and the reactive end group with the viscosity of 2000-10000mPa.s at 25 ℃ is matched with the polysiloxane resin with the reactive end group of alkoxy silicon group, the viscosity of the provided product is ensured to meet the spraying application requirement under high solid content, the problems of overhigh hardness and reduced toughness are effectively avoided, and the comprehensive performance of the product is good. The analysis reasons are that small molecules with low viscosity and reactive alkoxy silicon-based end groups can be effectively inserted between high molecular chains, the initial viscosity of the system is obviously reduced physically, the small molecules are compatible with polysiloxane resin with medium and low viscosity (2000-10000 Pa.s), the molecular weight distribution and viscosity gradien