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CN-122008363-A - Preparation method of waterproof marine plywood

CN122008363ACN 122008363 ACN122008363 ACN 122008363ACN-122008363-A

Abstract

The invention provides a preparation method of waterproof marine plywood, which belongs to the technical field of marine paint, and comprises the following steps of S1, adding fluorinated MXene into a solvent, performing ultrasonic dispersion to obtain a dispersion liquid, S2, adding cardanol glycidyl ether, bisphenol A epoxy resin, a rheological additive, a dispersing agent and the dispersion liquid obtained in S1 into a high-speed dispersing machine, performing high-speed shearing dispersion, then switching to low-speed stirring, adding epoxy modified polysiloxane, and uniformly stirring to obtain the waterproof paint, S3, preprocessing the plywood, uniformly mixing the waterproof paint obtained in S2 with a curing agent citric acid solution, coating the mixture on the surface of the plywood, and performing flash drying layering and step curing to obtain the waterproof marine plywood. By constructing a self-assembly system based on the surface energy gradient, a gradient structure with high adhesion at the bottom and superhydrophobic surface is formed by single coating, so that the construction efficiency is greatly improved, and the interlayer stripping problem of the traditional multilayer coating is thoroughly solved.

Inventors

  • ZHAO HOUBIN
  • LIU CHUANMING
  • Wei Xunrong
  • MA ZHONGQIU

Assignees

  • 徐州盛启家木业有限公司

Dates

Publication Date
20260512
Application Date
20260127

Claims (10)

  1. 1. The preparation method of the waterproof marine plywood is characterized by comprising the following steps of: S1, adding fluorinated MXene into a solvent, and performing ultrasonic dispersion to obtain a dispersion liquid; S2, adding cardanol glycidyl ether, bisphenol A epoxy resin, a rheological additive, a dispersing agent and the dispersion liquid obtained in the step S1 into a high-speed dispersing machine, carrying out high-speed shearing and dispersing, then switching to low-speed stirring, adding epoxy modified polysiloxane, and uniformly stirring to obtain a waterproof coating; and S3, preprocessing the plywood, uniformly mixing the waterproof coating obtained in the step S2 with a curing agent citric acid solution, coating the mixture on the surface of the plywood, and performing flash drying layering and step curing to obtain the waterproof marine plywood.
  2. 2. The preparation method of the waterproof paint according to claim 1, wherein the waterproof paint comprises, by weight, 60-80 parts of cardanol glycidyl ether, 10-20 parts of bisphenol A epoxy resin, 5-15 parts of epoxy modified polysiloxane, 0.5-3 parts of fluorinated MXene, 1-4 parts of rheological additive, 0.1-1 part of dispersing agent and 30-50 parts of solvent.
  3. 3. The preparation method of claim 2, wherein the solvent is a mixed solvent comprising xylene, propylene glycol methyl ether acetate and n-butanol, the mass ratio of the solvent is (4-6): 3-5): 0.5-1.5, and the rheological additive is hydrophobically modified fumed silica.
  4. 4. The method according to claim 1, wherein in step S1, the method for preparing fluorinated MXene comprises the steps of: Step S101, adding Ti 3 AlC 2 powder into a mixed solution containing LiF and hydrochloric acid, stirring and reacting for 20-25 hours at 30-40 ℃, centrifugally cleaning to be neutral, and carrying out ultrasonic stripping to obtain Ti 3 C 2 T x nano-sheet dispersion; And S102, adding 1.5-2wt% of perfluorooctyl triethoxysilane relative to the mass of the Ti 3 C 2 T x nano-sheets into the dispersion, adjusting the pH value to be acidic, refluxing and stirring for 12 hours at 60-65 ℃, and washing and drying to obtain the fluorinated MXene.
  5. 5. The method according to claim 1, wherein in step S2, the high-speed shearing dispersion is performed at a rotation speed of 1800-2200rpm for 15-25 minutes, and the low-speed stirring is performed at a rotation speed of 200-600rpm for 5-15 minutes.
  6. 6. The preparation method of claim 1, wherein in the step S3, the citric acid solution of the curing agent is an ethanol solution of citric acid with the mass concentration of 40-60%, and the mixing ratio of the waterproof coating and the citric acid solution of the curing agent is measured according to the molar ratio of carboxyl to epoxy of (0.9-1.1): 1.
  7. 7. The preparation method of the plywood, according to claim 1, is characterized in that in the step S3, the step of pretreating the plywood comprises the steps of selecting marine plywood with water content below 6%, polishing the surface with 180-240 mesh sand paper in a smooth line, removing dust by compressed air, and wiping the surface with acetone to perform degreasing treatment.
  8. 8. The preparation method according to claim 1, wherein in the step S3, the coating is performed by high-pressure airless spraying, and the wet film thickness of the coating is controlled to be 250-300 μm.
  9. 9. The preparation method according to claim 1, wherein in the step S3, the specific process condition of the flash delamination is that the flash delamination is carried out after coating, and the flash delamination is carried out for 30-45 minutes in a windless environment with the temperature of 20-30 ℃.
  10. 10. The method of claim 1, wherein in step S3, the step curing comprises a first curing stage and a second curing stage, wherein the first curing stage is heated at 75-85 ℃ for 1.5-2.5 hours and the second curing stage is heated at 130-150 ℃ for 0.5-1.5 hours.

Description

Preparation method of waterproof marine plywood Technical Field The invention belongs to the technical field of marine coatings, and particularly relates to a preparation method of waterproof marine plywood. Background Marine plywood is an important structural material applied to ship decks, cabin interior trim and ocean engineering, and is widely applied due to high strength-to-weight ratio and easy workability. In addition to the basic mechanical load-bearing capacity, marine plywood must also be able to withstand the high humidity, high salt, strong uv radiation and attack by marine organisms in the marine environment. The surface coating protection is a key means for isolating the external environment and prolonging the service life of the plywood, and particularly has high-performance coating with environmental adaptability and long-acting protection function, thereby having important significance for guaranteeing the safety of the ship structure. At present, the protection technology of the marine plywood mainly relates to two aspects of a coating process and a material system. In the coating process, a multi-layer composite system of primer, intermediate coat and finish is mainly adopted. Although the system realizes functional complementation through superposition of different coatings, the construction process is complex, the repainting interval between layers needs to be strictly controlled, and the interlayer peeling is easily caused by stress concentration or curing mismatch at the interface. In the material system, the rigid thermosetting resin and the antifouling functional material are mainly classified. Although the rigid material represented by bisphenol A epoxy resin has high hardness and strong barrier property, the rigid coating cannot relax along with the deformation of the base material due to the remarkable moisture absorption expansion and water loss shrinkage characteristics of wood in a dry-wet alternating environment, and microcracks are extremely easy to generate, so that the moisture invasion and the decay of the base material are caused. While the environment-friendly antifouling materials represented by organic silicon have low surface energy characteristics and can effectively inhibit the adhesion of organisms, the materials have poor wettability and adhesion with the surface of hydrophilic wood, and are difficult to be directly used as single-layer coating materials. In order to achieve both the penetration anchoring of wood and the antifouling and hydrophobic properties of the surface, the prior art attempts to solve the problems by physical blending or improving a multilayer process, but the simple physical blending is difficult to realize ordered distribution of functional components in the thickness direction, and the multilayer process cannot solve the problems of interlayer failure and low construction efficiency. Therefore, the development of a preparation method which can realize layered assembly of the interior of a coating through single construction, can adapt to wood deformation to prevent cracking and can provide efficient antifouling surfaces is a technical problem to be solved at present. Disclosure of Invention In view of the foregoing, it is an object of the present invention to provide a method for manufacturing a waterproof marine plywood, which at least partially solves the problems set forth in the background art. The technical scheme adopted by the invention is as follows: The invention provides a preparation method of a waterproof marine plywood, which comprises the following steps: S1, adding fluorinated MXene into a solvent, and performing ultrasonic dispersion to obtain a dispersion liquid; S2, adding cardanol glycidyl ether, bisphenol A epoxy resin, a rheological additive, a dispersing agent and the dispersion liquid obtained in the step S1 into a high-speed dispersing machine, carrying out high-speed shearing and dispersing, then switching to low-speed stirring, adding epoxy modified polysiloxane, and uniformly stirring to obtain a waterproof coating; and S3, preprocessing the plywood, uniformly mixing the waterproof coating obtained in the step S2 with a curing agent citric acid solution, coating the mixture on the surface of the plywood, and performing flash drying layering and step curing to obtain the waterproof marine plywood. In some embodiments of the invention, the waterproof coating comprises, by weight, 60-80 parts of cardanol glycidyl ether, 10-20 parts of bisphenol A epoxy resin, 5-15 parts of epoxy modified polysiloxane, 0.5-3 parts of fluorinated MXanee, 1-4 parts of rheological additive, 0.1-1 part of dispersing agent and 30-50 parts of solvent. In some embodiments of the invention, the solvent is a mixed solvent comprising xylene, propylene glycol methyl ether acetate and n-butanol, wherein the mass ratio of the solvent is (4-6): 3-5): 0.5-1.5, and the rheological additive is hydrophobically modified fumed silica. In some embodimen