CN-121991543-A - Solvent-free rapidly-curable hydrophobic transparent antifouling coating and preparation method thereof

Abstract

The invention relates to the technical field of antifouling coatings, and provides a solvent-free prepared hydrophobic transparent antifouling coating and a preparation method thereof. The coating takes hydroxy-terminated polydimethylsiloxane as a main body, tetraethyl orthosilicate, hydrophilic monomers and hydrophobic monomers are added, and the coating is quickly solidified under the action of a photoinitiator and a catalyst at room temperature to form a transparent coating. The preparation method of the antifouling coating comprises the following steps of taking hydroxyl-terminated polydimethylsiloxane as a main material, adding tetraethyl orthosilicate, hydrophilic monomers, hydrophobic monomers, an initiator and a catalyst, mixing and stirring according to a certain proportion, coating the antifouling coating on a substrate, and curing and drying the antifouling coating. The coating has high hydrophobicity and excellent anti-fouling and light-transmitting properties, and can realize strong adhesion on the surfaces of various base materials such as glass, polymers, metals, fibers and the like. The method does not need an organic solvent, is environment-friendly, and is suitable for large-scale preparation.

Inventors

• ZHANG KUNXI
• Shu Haobo
• FANG HAOWEI
• YANG XINYU

Assignees

• 上海大学

Dates

Publication Date

20260508

Application Date

20251219

Claims (10)

1. 1. A method for preparing a solvent-free rapidly curable hydrophobic transparent antifouling coating, comprising the steps of: Hydroxyl-terminated polydimethylsiloxane is used as a matrix, tetraethyl orthosilicate, hydrophilic monomers, hydrophobic monomers, a photoinitiator and a tin catalyst are added, and after being uniformly mixed in a solvent-free system, the transparent antifouling coating is obtained by ultraviolet irradiation of 5min and solidification of 4h at 20-35 ℃.
2. 2. The method for producing an antifouling coating according to claim 1, wherein the mass ratio of said hydroxy-terminated polydimethylsiloxane to tetraethyl orthosilicate is (20-70): 4-14.
3. 3. The method for producing an antifouling coating according to claim 1, wherein the hydrophilic monomer is one of hydroxyethyl methacrylate, 2-propenoxyethanol, and acrylic acid ester.
4. 4. The method for producing an antifouling coating according to claim 1, wherein the hydrophobic monomer is one of butyl methacrylate, glycidyl methacrylate, and ethyl 2- (perfluorooctyl) methacrylate.
5. 5. The method for producing an antifouling coating according to claims 1,3 and 4, wherein the mass ratio of the hydrophilic monomer to the hydrophobic monomer is (10-30): 10-30.
6. 6. The method for preparing an antifouling coating according to claim 1, wherein the initiator is one of 2-hydroxy-2-methyl-1- [4- (2-hydroxyethoxy) phenyl ] -1-propanone, benzophenone, phenyl-2, 4, 6-trimethylbenzoyl lithium phosphinate.
7. 7. The method for producing an antifouling coating according to claim 1, wherein the catalyst is one of dibutyltin dilaurate and stannous octoate.
8. 8. The method for preparing an antifouling coating according to claim 1, wherein the mass ratio of the initiator to the catalyst is 1 (1-10).
9. 9. The method for producing an antifouling coating according to claim 1, wherein the curing temperature is 20 to 35 ℃ and the time is 1 to 6h when the antifouling coating is produced.
10. 10. Use of an anti-fouling coating prepared by a method according to any one of claims 1-9, characterized in that the coating is suitable for anti-fouling, anti-fingerprint, anti-greasy, anti-fog applications on the surface of a substrate such as glass, polymer, metal, rubber, fabric, etc.

Description

Solvent-free rapidly-curable hydrophobic transparent antifouling coating and preparation method thereof Technical Field The invention relates to the field of antifouling coatings, in particular to a hydrophobic colorless transparent antifouling coating applicable to various materials and a preparation method thereof. Background Dirt, i.e. unwanted adhesion, is attached to a surface either reversibly or irreversibly in a variety of ways, such as macromolecules, microorganisms or suspended particles. This process is a ubiquitous problem in real life, creating many challenges in medical, marine and industrial applications. In medical applications, fouling can present significant health risks, including the transmission of infectious diseases, rejection of implants, and failure of sensors. In marine environments, fouling on the hull increases drag, corrosion, and fuel consumption. Thus, it is highly desirable to find a method that can be adapted to a variety of materials to combat or reduce fouling. The polymer-based coating is low in price, easy to process, has a wide range of efficacy, and has high versatility. Their function and structure can be easily modified, which allows the interface characteristics to be tuned to improve specific performance. The adhesion of soil is primarily dependent on surface properties such as surface energy, wettability and microstructure, so altering the surface structure is considered a direct soil control method. The most common and successful method of achieving this is to treat the substrate with an anti-fouling coating. Hydrophobic surfaces are surfaces commonly found in nature (e.g., lotus leaf, butterfly wings, taro leaves, mosquito eyes, water legs, etc.). Because of the application of the anti-corrosion, anti-fouling, self-cleaning, oil-water separation, viscous drag reduction and the like, has received a great deal of attention in recent years. Hydrophobicity is determined by both surface chemistry and topography, and can be quantified by water contact angle, with surfaces having Water Contact Angles (WCA) greater than 150 ° and sliding angles less than 15 ° generally being defined as superhydrophobic surfaces. The hydrophobic coating is effective to prevent dirt from contacting the substrate, making it a suitable candidate for an anti-fouling coating. However, the existing anti-fouling coating technology focuses on high anti-fouling properties, i.e. contaminants cannot adhere to the surface and thus achieve anti-fouling effects. Optical devices such as lenses require transparent coatings with high anti-fouling effects, devices such as detectors require high anti-fouling coatings which can be permanently adhered and adapt to harsh environments, plastic substrates require anti-fouling coatings which do not contain organic solvents and which can be stably adhered, and these are all the problems to be solved by the current mainstream anti-fouling coating technology. Polydimethylsiloxane is a common material for preparing an antifouling coating at present, has the advantages of extremely low surface energy, high hydrophobicity, high light transmittance, excellent physiological inertia, high biocompatibility and the like, and has wide application prospects in the fields of antifouling coatings, gas-liquid sealants and the like. However, the existing anti-fouling coating systems based on polydimethylsiloxane generally depend on organic solvents to reduce viscosity and improve film forming property, and meanwhile increase biological and environmental safety risks, and the problems of insufficient adhesion and slow curing of the coating on the surfaces of different substrates are caused. In addition, solvent residues can reduce the optical clarity and biocompatibility of the coating, limiting its application in the field of optics and medical devices. Therefore, there is an urgent need for a hydrophobic anti-fouling coating system that does not require an organic solvent, cures rapidly at room temperature, and combines high transparency with strong adhesion to overcome the limitations of the prior art. Disclosure of Invention In order to overcome the defects of the polydimethylsiloxane anti-fouling coating technology, the invention provides a hydrophobic colorless transparent anti-fouling coating which is suitable for various materials and does not need an organic solvent and a preparation method thereof, as shown in figure 7. The aim of the invention can be achieved by the following technical scheme: a method for preparing a solvent-free rapidly curable hydrophobic transparent antifouling coating, comprising the steps of: Hydroxyl-terminated polydimethylsiloxane (PDMS-OH) is used as a matrix, tetraethyl orthosilicate (TEOS), hydrophilic monomers and hydrophobic monomers are added, and under the combined action of a photoinitiator and a tin catalyst, the mixture is uniformly mixed at room temperature, and then ultraviolet light irradiation curing is carried out to form the tra