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CN-122011872-A - PVB resin-based anti-corrosion weather-resistant coating and preparation method thereof

CN122011872ACN 122011872 ACN122011872 ACN 122011872ACN-122011872-A

Abstract

The invention relates to the technical field of anti-corrosion coating, in particular to an anti-corrosion weather-resistant coating based on PVB resin and a preparation method thereof. The anti-corrosion weather-resistant coating is prepared from modified PVB resin, acrylic emulsion, composite filler, organic silicone oil, silane coupling agent, film forming auxiliary agent, photoinitiator and deionized water according to a specific weight portion ratio, wherein the composite filler is a mixture of talcum powder, kaolin, wollastonite powder, organic modified montmorillonite and nano SiO 2 . The anti-corrosion weather-proof coating provided by the invention has the advantages that the structure of PVB resin molecules is modified and regulated, the sheet-shaped blocking structure and the interface strengthening effect of the composite filler are combined, the water resistance and alkali resistance of the coating are obviously improved, the anti-corrosion weather-proof effect is further enhanced, and the anti-corrosion weather-proof coating can be applied for a long time in humid, alkaline and high-salt-fog severe environments such as ships and ocean engineering.

Inventors

  • PAN BENHAO
  • WANG GAICHAO

Assignees

  • 江西天城高新材料有限公司

Dates

Publication Date
20260512
Application Date
20260304

Claims (10)

  1. 1. The anti-corrosion weather-resistant coating based on the PVB resin is characterized by comprising modified PVB resin, acrylic emulsion, composite filler, organic silicone oil, a silane coupling agent, a film-forming auxiliary agent, a photoinitiator and deionized water; the composite filler is a mixture of talcum powder, kaolin, wollastonite powder, organically modified montmorillonite and nano SiO 2 ; the modified PVB resin is prepared from PVA as a raw material through acetalation, hydrophobic grafting of fluorine-containing monomers and isocyanate crosslinking.
  2. 2. The anticorrosive weather-resistant coating based on PVB resin, according to claim 1, wherein the mass ratio of the modified PVB resin, the acrylic emulsion, the composite filler, the organic silicone oil, the silane coupling agent, the film forming auxiliary agent, the photoinitiator and the deionized water is (30-40): (15-25): (18-25): (5-8): (1-2): (5-8): (3-5): (10-15); the mass ratio of talcum powder, kaolin, wollastonite powder, organic modified montmorillonite and nano SiO 2 in the composite filler is 6:3:9 (2-3) (1-2), and the organic modified montmorillonite is cetyl trimethyl ammonium bromide modified montmorillonite.
  3. 3. The PVB resin-based corrosion and weather resistant coating of claim 1, wherein the silane coupling agent comprises any one of KH-550, KH-560, and KH-570, the film forming aid comprises any one of propylene glycol methyl ether acetate, propylene glycol ethyl ether, and dipropylene glycol methyl ether, and the photoinitiator comprises any one of photoinitiator 1173, photoinitiator 184, and photoinitiator TPO.
  4. 4. The PVB resin-based corrosion-resistant weather-resistant coating of claim 1, wherein the preparation of the modified PVB resin comprises the steps of: Adding PVA and n-butyraldehyde into ethanol solution, adding sulfonated activated carbon solid acid, and reacting for 10-12 hours at 7-9 ℃ to obtain acetal PVB resin; t2, sequentially adding methyl methacrylate, fluorine-containing acrylic ester and azodiisobutyronitrile into the acetal PVB resin, and reacting for 4-5 hours in an oil bath at 80-85 ℃ to obtain a graft copolymer; and T3, adding an isocyanate cross-linking agent into the graft copolymer, and reacting for 1-2h at 55-60 ℃ to obtain the modified PVB resin.
  5. 5. The PVB resin-based anticorrosive weather-resistant coating according to claim 4, wherein in the T1, the sulfonated activated carbon solid acid is prepared by sulfonation modification of activated carbon by concentrated sulfuric acid, the loading capacity of sulfonic acid groups is not less than 1.0mmol/g, the water content is not more than 1%, the mass ratio of PVA, n-butyraldehyde and the sulfonated activated carbon solid acid is 100:70 (2-3), and the volume ratio of ethanol to water in the ethanol solution is 1.1:1.
  6. 6. The PVB resin-based corrosion and weather resistant coating according to claim 4, wherein in the T2, the mass ratio of the acetal PVB resin, the methyl methacrylate, the fluorine-containing acrylate to the azobisisobutyronitrile is 100:30:15 (0.2-0.9), and the fluorine-containing acrylate comprises any one of tridecafluorooctyl acrylate, perfluorodecyl acrylate and trifluoroethyl methacrylate.
  7. 7. The PVB resin-based anticorrosive weather-resistant coating according to claim 4, wherein the mass ratio of the graft copolymer to the isocyanate-based crosslinking agent in T3 is (11-15): 1, and the isocyanate-based crosslinking agent comprises any one of hexamethylene diisocyanate, toluene diisocyanate, and isophorone diisocyanate.
  8. 8. A method of preparing a PVB resin-based corrosion-resistant weather-resistant coating according to claim 1, comprising the steps of: s1, adding modified PVB resin and acrylic emulsion into a dispersion kettle, and stirring to obtain a mixed base material; s2, adding composite filler into the mixed base material, performing high-shear dispersion, and performing ultrasonic treatment to obtain a premix; And S3, sequentially adding organic silicone oil, a silane coupling agent, a film forming auxiliary agent, a photoinitiator and deionized water into the premix, continuously stirring, and filtering to obtain the PVB resin-based anticorrosive weather-resistant coating.
  9. 9. The method for preparing the PVB resin-based anticorrosive weather-resistant coating according to claim 8, wherein in the step S1, the stirring condition is that the rotating speed is 1300-1500r/min and the stirring time is 30-60min.
  10. 10. The method for preparing the PVB resin-based anticorrosive weather-resistant coating according to claim 8, wherein in the step S2, the high-shear dispersing condition is that the rotating speed is 2500-3500r/min, the dispersing time is 30-45min, the ultrasonic condition is that the power is 200-250W, the ultrasonic time is 20-30min, and the stirring condition is that the rotating speed is 300-500r/min and the stirring time is 1-3h.

Description

PVB resin-based anti-corrosion weather-resistant coating and preparation method thereof Technical Field The invention belongs to the technical field of anti-corrosion coating, and particularly relates to an anti-corrosion weather-resistant coating based on PVB resin and a preparation method thereof. Background Polyvinyl butyral (PVB) resins have been widely used in industrial fields such as paints, adhesives, photovoltaic packaging, and the like, because of their excellent film formation continuity, substrate adhesion compatibility, and basic weather resistance stability. In the field of anti-corrosion weather-resistant paint, PVB resin becomes a potential high-quality base material candidate by virtue of unique film forming toughness and good adhesion to base materials such as metal/concrete and the like. However, when the traditional PVB resin-based anti-corrosion weather-resistant coating is applied in severe outdoor environments such as humidity, alkalinity, high salt mist and the like, the core defects of poor water resistance, alkali resistance and short corrosion resistance life are commonly existed, and the popularization and application of the traditional PVB resin-based anti-corrosion weather-resistant coating in the high-end anti-corrosion fields such as ships, ocean engineering and the like are severely limited. And meanwhile, the linear PVB intermolecular crosslinking density is low, and a large number of microscopic pores exist in the formed coating, so that a channel is provided for alkali liquor permeation, and further the swelling and falling of the coating are induced. On the other hand, the filler in the paint formula is unevenly dispersed, the film forming auxiliary agent is improperly selected, and the interface defect formed in the film forming process further aggravates the deterioration of the water and alkali resistance. The lack of water resistance and alkali resistance can directly lead corrosive media (such as water, alkali liquor, chloride ions and the like) to easily invade the inside of the coating film, cause corrosion of a base material and ageing of the coating film, and finally lead to failure of the anti-corrosion and weather-resistant effects. In the prior art, attempts are made to optimize the performance of the coating by means of resin compounding, filler modification and the like, for example, PVB is simply blended with acrylic resin, or a single type of hydrophobic filler is added, but the improvement can only improve the water resistance of the coating on the surface, the problems of hydrophilic defects and insufficient crosslinking of PVB resin cannot be solved from the molecular structure level, and the fundamental improvement of the water resistance and alkali resistance is difficult to realize. In the PVB modification field, the existing research is concentrated on a composite binder system, and the interfacial binding force is improved through a hydrogen bond network, but the collaborative design of hydrophobic group grafting and crosslinking modification is not involved, and the hydrophilic defect cannot be radically solved. Therefore, development of an anti-corrosion weather-resistant coating based on PVB resin and a preparation method thereof are needed, and the anti-corrosion weather-resistant effect is enhanced by improving the water resistance and the alkali resistance, so that the wide application of the anti-corrosion weather-resistant coating based on PVB resin in humid, alkaline and other severe environments of ships, ocean engineering and the like is realized. Disclosure of Invention Aiming at the defects of the prior art, the invention provides the anti-corrosion weather-resistant coating based on PVB resin and the preparation method thereof, wherein the PVB resin is subjected to three steps of synergistic modification of high acetalation, hydrophobic grafting and crosslinking, and the water resistance and the alkali resistance of the coating are improved by combining with the optimization of a composite filler and the composite film forming process, so that the penetration of corrosive media is blocked, and the anti-corrosion weather-resistant effect is further enhanced. In a first aspect, the present application provides a PVB resin-based corrosion-resistant weatherable coating comprising a modified PVB resin, an acrylic emulsion, a composite filler, a silicone oil, a silane coupling agent, a film forming aid, a photoinitiator, and deionized water; the composite filler is a mixture of talcum powder, kaolin, wollastonite powder, montmorillonite and nano SiO 2. Preferably, the mass ratio of the modified PVB resin to the acrylic emulsion to the composite filler to the organic silicone oil to the silane coupling agent to the film forming auxiliary agent to the photoinitiator to the deionized water is (30-40) (15-25) (18-25) (5-8) (1-2) (5-8) (3-5) (10-15), the mass ratio of the talcum powder to the kaolin to the wollastonite powder to the organic mod