Micro-nano coating material with low surface energy and preparation method thereof

Abstract

The invention belongs to the technical field of functional materials, and particularly relates to a micro-nano coating material with low surface energy and a preparation method thereof. The preparation method comprises the following steps of mixing composite microspheres with micro sodium structure and hydrophobic nature, matrix resin with contact angle more than 90 degrees with coating film, solvent, powder, and additive, and adopting a co-mixing method, an in-situ emulsion polymerizing method, an in-situ solution polymerizing method, an in-situ concentration and polymerizing method, an in-situ addition and polymerizing method and the like, so as to prepare the coating material with micro-nano structure; performing spraying, brushing, roll coating, photo-etching, 3D (three-dimensional) printing, mechanical processing and the like, drying and curing at the temperature of 0 to 1000 DEG C, and coating the coating material with micro-nano structure onto different matrix surfaces, so as to obtain the micro-nano coating material with low surface energy and groove structure. The micro-nano coating material has the advantages that the preparation technology is simple, the coating hardness is high, the water-resistant property is good, the adhesion force to different matrix surfaces is strong, and the micro-nano coating material can be used for self-cleaning, resistance-reducing, denoising, anti-icing and other functional materials.

Description

technical field

[0001] The invention belongs to the technical field of functional materials, and in particular relates to a low surface energy micro-nano coating material and a preparation method thereof. Background technique

[0002] Due to the characteristics of light weight, excellent mechanical properties, good corrosion resistance, and excellent electrical properties, coating materials are widely used in the fields of construction, aerospace, trains, automobiles, ships, energy, oceans, etc. as surface protection of base materials, coatings In addition to the protective function, special functions such as light, electricity, heat, force, etc. can be obtained through the selection of matrix resin, pigments and fillers, additives, etc. of the coating material, and the control of the coating structure, such as photosensitive coating layer, heat-sensitive coating, antistatic coating, drag-reducing coating, anti-icing coating, wear-resistant coating, scratch-resistant coating...

Examples

Embodiment 1

[0054] Monodisperse positively charged polymethyl methacrylate (PMMA) microspheres with a particle size of 20 microns were prepared by dispersion polymerization, the aqueous dispersion was diluted to a solid content of 10%, and then 5% of the particle size was added to 50 nm Siloxane modified silica sol (SiO 2 ), stirred at 80°C for 20 hours, separated, washed, and dried in an oven at 70°C for 100 hours. Strawberry-type hydrophobic PMMA / SiO can be obtained 2 Micro-nano structure composite microspheres.

[0055] Put 5 grams of strawberry type PMMA / SiO 2 Micro-nano structure composite microspheres, 10 grams of methyl methacrylate (MMA), 5 grams of n-butyl acrylate (BA), 2 grams of acrylic acid (AA), 4 grams of vinyl siloxane monomer, 0.5 grams of azobis Isobutyronitrile (AIBN) and 74 grams of butyl acetate were mixed, and the mixture was reacted in a 500mL four-neck bottle at 70-80°C for 24 hours to prepare a low surface energy micro-nano coating material, which was coated on...

Embodiment 2

[0057] Weigh 40 g of polydimethylsiloxane microspheres (PDMS) with a particle size of 50 microns and hydroxyl groups on the surface, 60 grams of water, and 1 g of polydimethylsiloxane with a particle size of 10 nm and alkoxy groups on the surface Oxane microspheres (PDMS), stirred at 50°C for 100 hours, separated, washed, and dried in a vacuum oven at 50°C for 24 hours. The hydrophobic PDMS / PDMS micro-nano structure composite microspheres can be obtained.

[0058] 50 grams of PDMS / PDMS micro-nano structure composite microspheres, 10 grams of silicone modified fluororesin, 4 grams of titanium dioxide, 3 grams of kaolin, 3 grams of barium sulfate, 20 grams of propylene glycol butyl ether acetate, 10 grams of acetone, 0.1 grams Defoamer, 0.2 g dispersant, 0.7 g simethicone, stirred at room temperature for 2 hours to prepare a low surface energy micro-nano coating material, and the low surface energy coating material with groove structure can be obtained by roller coating. Capabl...

Embodiment 3

[0060] Weigh glass microspheres with a particle size of 200 microns, use the hydrofluoric acid etching method to make the surface of the glass microspheres have carboxyl groups, mix 70g of modified glass microspheres, 10 grams of nano-titanium dioxide (TiO 2 ), 20 grams of water, stirred at room temperature for 50 hours, separated and washed, and the product was placed at room temperature for 2 days to obtain hydrophobic TiO 2 / Glass micro-nano structure composite microspheres.

[0061] 70 g TiO 2 / glass micro-nano structure composite microspheres, 20 grams of ultraviolet curing (UV) acrylate-polyurethane resin, 10 grams of ultraviolet curing (UV) polyester-polyurethane resin, stirred at 40 ° C for 20 minutes to prepare low surface energy microspheres The nano-coating material adopts ultraviolet curing (UV) and etching methods to obtain a low surface energy micro-nano coating with a groove structure. The water contact angle of the coating is 120°.

technical field

[0001] The invention belongs to the technical field of functional materials, and in particular relates to a low surface energy micro-nano coating material and a preparation method thereof. Background technique

[0002] Due to the characteristics of light weight, excellent mechanical properties, good corrosion resistance, and excellent electrical properties, coating materials are widely used in the fields of construction, aerospace, trains, automobiles, ships, energy, oceans, etc. as surface protection of base materials, coatings In addition to the protective function, special functions such as light, electricity, heat, force, etc. can be obtained through the selection of matrix resin, pigments and fillers, additives, etc. of the coating material, and the control of the coating structure, such as photosensitive coating layer, heat-sensitive coating, antistatic coating, drag-reducing coating, anti-icing coating, wear-resistant coating, scratch-resistant coating...

Examples

Embodiment 1

[0054] Monodisperse positively charged polymethyl methacrylate (PMMA) microspheres with a particle size of 20 microns were prepared by dispersion polymerization, the aqueous dispersion was diluted to a solid content of 10%, and then 5% of the particle size was added to 50 nm Siloxane modified silica sol (SiO 2 ), stirred at 80°C for 20 hours, separated, washed, and dried in an oven at 70°C for 100 hours. Strawberry-type hydrophobic PMMA / SiO can be obtained 2 Micro-nano structure composite microspheres.

[0055] Put 5 grams of strawberry type PMMA / SiO 2 Micro-nano structure composite microspheres, 10 grams of methyl methacrylate (MMA), 5 grams of n-butyl acrylate (BA), 2 grams of acrylic acid (AA), 4 grams of vinyl siloxane monomer, 0.5 grams of azobis Isobutyronitrile (AIBN) and 74 grams of butyl acetate were mixed, and the mixture was reacted in a 500mL four-neck bottle at 70-80°C for 24 hours to prepare a low surface energy micro-nano coating material, which was coated on...

Embodiment 2

[0057] Weigh 40 g of polydimethylsiloxane microspheres (PDMS) with a particle size of 50 microns and hydroxyl groups on the surface, 60 grams of water, and 1 g of polydimethylsiloxane with a particle size of 10 nm and alkoxy groups on the surface Oxane microspheres (PDMS), stirred at 50°C for 100 hours, separated, washed, and dried in a vacuum oven at 50°C for 24 hours. The hydrophobic PDMS / PDMS micro-nano structure composite microspheres can be obtained.

[0058] 50 grams of PDMS / PDMS micro-nano structure composite microspheres, 10 grams of silicone modified fluororesin, 4 grams of titanium dioxide, 3 grams of kaolin, 3 grams of barium sulfate, 20 grams of propylene glycol butyl ether acetate, 10 grams of acetone, 0.1 grams Defoamer, 0.2 g dispersant, 0.7 g simethicone, stirred at room temperature for 2 hours to prepare a low surface energy micro-nano coating material, and the low surface energy coating material with groove structure can be obtained by roller coating. Capabl...

Embodiment 3

[0060] Weigh glass microspheres with a particle size of 200 microns, use the hydrofluoric acid etching method to make the surface of the glass microspheres have carboxyl groups, mix 70g of modified glass microspheres, 10 grams of nano-titanium dioxide (TiO 2 ), 20 grams of water, stirred at room temperature for 50 hours, separated and washed, and the product was placed at room temperature for 2 days to obtain hydrophobic TiO 2 / Glass micro-nano structure composite microspheres.

[0061] 70 g TiO 2 / glass micro-nano structure composite microspheres, 20 grams of ultraviolet curing (UV) acrylate-polyurethane resin, 10 grams of ultraviolet curing (UV) polyester-polyurethane resin, stirred at 40 ° C for 20 minutes to prepare low surface energy microspheres The nano-coating material adopts ultraviolet curing (UV) and etching methods to obtain a low surface energy micro-nano coating with a groove structure. The water contact angle of the coating is 120°.

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