CN-121495462-B - Preparation method of organic/inorganic composite coating with transparency, ultraviolet resistance and antifouling property

Abstract

The invention discloses a preparation method of an organic/inorganic composite coating with transparency, ultraviolet resistance and antifouling property, which comprises the following steps of preparing SiO 2 by adopting an acid catalytic sol-gel method, and preparing an organic/inorganic hybrid antifouling coating with high hardness, transparency and ultraviolet resistance by graft polymerization. The method prepares SiO 2 by a sol-gel method, constructs a continuous organic silicon resin network by methyl phenyl polysiloxane resin, simultaneously adds inorganic phase SiO 2 and organic MT-PDMS and octocrylene as polymerization reactants, and prepares the organic/inorganic hybrid coating by grafting, polymerization and the like. This unique design gives the coating excellent transparency, stain resistance, uv resistance. In addition, the coating also has good hardness and abrasion resistance, and still maintains excellent transparency and ultraviolet resistance under low and high temperature environments.

Inventors

• HAO YUWEI
• XIE WENFENG
• JIAO SHOUZHENG
• SUN ZHICHENG
• ZHANG XINYU
• PAN FANGHUA
• Xi Rongxue

Assignees

• 北京印刷学院

Dates

Publication Date

20260512

Application Date

20251124

Claims (6)

1. 1. A method for preparing an organic/inorganic composite coating having transparency, uv resistance and stain resistance, characterized in that the method comprises the steps of: step one, preparing SiO 2 by adopting an acid catalysis sol-gel method; Preparing an organic/inorganic hybrid antifouling coating with high hardness, transparency and ultraviolet resistance through graft polymerization: Uniformly dispersing SiO 2 in a solvent to obtain SiO 2 dispersion, wherein the content of SiO 2 in the SiO 2 dispersion is 1.0-6.0 wt%; Step two, adding the octocrylene into SiO 2 dispersion liquid to uniformly disperse the octocrylene, so as to obtain a mixed solution A, wherein the content of the octocrylene in the mixed solution A is 0.5-5 wt%; Adding methoxy-polydimethylsiloxane and methylphenyl polysiloxane resin into the mixed solution A to uniformly disperse the methoxy-polydimethylsiloxane and the methylphenyl polysiloxane resin to obtain a mixed solution B, wherein the content of the methoxy-polydimethylsiloxane in the mixed solution B is 1.0-6.0 wt% and the content of the methylphenyl polysiloxane resin is 40-60 wt%; spraying the mixed solution B onto a clean substrate; step five, covering and drying the sample sprayed in the step two and the step four at room temperature to volatilize the solvent partially; Step six, solidifying the sample in the step two in a drying oven; And seventhly, taking out the sample in the drying oven, and cooling to room temperature to obtain the UV-HSC.
2. 2. The method for preparing an organic/inorganic composite coating having transparency, uv resistance and stain resistance according to claim 1, wherein in the second step, the solvent is xylene, toluene or cyclohexanone.
3. 3. The method for preparing an organic/inorganic composite coating having transparency, uv resistance and stain resistance according to claim 1, wherein in the second to fourth steps, the substrate is glass, plastic or metal substrate.
4. 4. The method for preparing an organic/inorganic composite coating with transparency, ultraviolet resistance and antifouling property according to claim 1, wherein in the second step, the spraying diameter is controlled to be 0.2-0.5 mm, the spraying pressure is controlled to be 1.0-2.0 bar, and the coating thickness is controlled to be 30-60 μm.
5. 5. The method for producing an organic/inorganic composite coating having transparency, uv resistance and stain resistance according to claim 1, wherein in the second five steps, the drying time is 0.5 to 1.5 hours.
6. 6. The method for preparing an organic/inorganic composite coating having transparency, uv resistance and stain resistance according to claim 1, wherein in the second step, the curing temperature is 150 to 200 ℃ and the time is 0.5 to 1.5 hours.

Description

Preparation method of organic/inorganic composite coating with transparency, ultraviolet resistance and antifouling property Technical Field The invention relates to a preparation method of an organic/inorganic composite coating, in particular to a preparation method of an organic/inorganic composite coating with transparency, ultraviolet resistance and antifouling property. Background An antifouling coating, also known as an antifouling paint or paint, is a functional coating that has a low surface energy and is less likely to adhere to surfaces by aqueous and oily contaminants. The antifouling coating is widely applied to the fields of intelligent glass, photovoltaic devices, ship antifouling and anticorrosion, pipeline drag reduction and the like because of the characteristics of pollution prevention, self cleaning and the like. Generally, antifouling coatings are classified according to chemical composition, and are mainly classified into inorganic coatings and organic coatings. The inorganic coating is mainly made of metal oxide (SiO 2、Al2O3), silicate or ceramic (SiC, tiN), and forms a network structure through ionic bond/covalent bond. The inorganic coating has the advantages of high hardness, good wear resistance, good mechanical property and the like, but also has the defects of high brittleness, easy cracking and the like. The organic coating uses polymer as matrix (epoxy resin, polyurethane, acrylic ester, etc.), contains covalent bond of C-C/C-O and Van der Waals force, has good crosslinking density and flexibility, but its hardness and mechanical property are far less than those of inorganic coating. In order to solve the above problems, organic/inorganic hybrid coating has become a research hotspot in recent years. The organic/inorganic hybrid coating combines the advantages of inorganic phases (SiO 2, znO, etc.) and organic phases (silicone, polyurethane, etc.), and is prepared by the methods of molecular-level interface design, chemical bonding, etc. This preparation breaks the inorganic/organic phase performance barrier and is considered as a solution to the above-mentioned problems. Meanwhile, with industrial progress and consumer upgrades, the performance requirements on the antifouling coating are increasingly severe, and the single-function coating cannot meet the extremely pursuit of the modern industry and consumer products on the material performance. The multifunctional protective coating can organically integrate various protective mechanisms (physical shielding, chemical stability, surface energy regulation and control and the like) into a synergistic coating system through material innovation and process optimization, and becomes a necessary trend of development in the technical field of antifouling coatings. Therefore, the organic/inorganic composite coating preparation method which can effectively cooperate with the anti-ultraviolet and anti-fouling functions and has good durability, environmental protection and process feasibility is developed, and not only has important scientific and technical values, but also has wide commercial application prospect. Lv Jianyong team （Guo X, Di Y, Liang Q, et al. Inorganic–organic silica/PDMS nanocomposite antiadhesive coating with ultrahigh hardness and thermal stability[J]. ACS Applied Materials & Interfaces, 2023, 15 (13): 17245-17255.） of the national academy of sciences of China proposed a silica/Polydimethylsiloxane (PDMS) nanocomposite coating (SPNC) that covalently embeds nanophase PDMS as a dispersed phase into a silica continuous phase by a sol-gel process with covalent bonding. The nano-confined PDMS phase exhibits enhanced thermal stability and imparts SPNC smooth behavior while the enrichment of PDMS at the surface exhibits a gradient composition of the coating. The SPNC coating obtained has high nanoindentation hardness of 3.07 GPa and pencil hardness exceeding 9H, has thermal stability as high as 400 ℃ and shows excellent adhesive strength to different substrates. In addition, SPNC also has high optical transparency, good flexibility, and antibacterial adhesion and chemical corrosion resistance. The marchantia team （Chen R, Zhang Y, Xie Q, et al. Transparent polymer-ceramic hybrid antifouling coating with superior mechanical properties[J]. Advanced Functional Materials, 2021, 31 (19): 2011145.） at the university of south China, by compounding amine-terminated hyperbranched polysiloxane with stain-resistant zirconium epoxy particles, successfully prepared an organic/inorganic hybrid aqueous stain-resistant coating. Wherein the amine-terminated hyperbranched polysiloxane is prepared from an amine-functional silane, and the stain resistant zirconium oxide particles are prepared by reacting zirconium oxide with the epoxy-functional silane and a zwitterionic silane. The composite coating shows the combination of the characteristics of the polymer and the ceramic, not only has high transparency, high hardness and excellent substrat