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A kind of superhydrophilic/underwater superoleophobic coating material and preparation method thereof

A technology of underwater super-oleophobic and coating materials, which is applied in antifouling/underwater coatings, coatings, paints containing biocides, etc., and can solve problems such as poor water resistance, low transparency of coatings, and poor mechanical properties. problems, to achieve the effect of good mechanical properties of the coating, high transparency of the coating, and low cost of raw materials

Active Publication Date: 2019-05-31
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent CN103524766A prepares a transparent or opaque polymer micro-nano structure template by sanding, while CN101220165 uses fish scales as a natural template, and obtains a polydimethylsiloxane template with a fish scale negative structure through one-time shaping. On this basis, The hydrophilic polymer or monomer is shaped during cross-linking to obtain surface micro-nano structures, but the above-mentioned template method is not suitable for large-scale preparation of underwater super-oleophobic surfaces
Although the sol-gel method and the nanocomposite coating method can obtain a large-area underwater superoleophobic surface, the micro-nano structure exists not only on the surface, but also in the interior of the coating, resulting in low transparency of the coating and poor mechanical properties. poor performance
In addition, when hydrophilic polymers are used as film-forming substances, there are still problems such as easy peeling off of the coating and poor water resistance.

Method used

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  • A kind of superhydrophilic/underwater superoleophobic coating material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Dissolve 5g of polyvinyl alcohol (PVA) 1788 with a degree of alcoholysis of 88% with 50g of hot water, and add 2.5g of SiO with a particle size of 12nm 2 , made of PVA / SiO 2 / 33% dispersion. 2g of hydroxyacrylic resin and 0.2g of fully etherified melamine were dissolved in 5g of butyl acetate, and 0.01g of p-toluenesulfonic acid was added. The solution was rolled onto a standard glass slide with a 120 μm wire bar. After the solvent is fully volatilized and the coating film loses its fluidity, a layer of PVA / SiO is coated on it with a 120 μm wire rod. 2 / 33% dispersion. After the upper liquid film is dried at room temperature, the uncrosslinked double-layer coating is placed in an oven at 70° C. for 0.5-5 hours. After taking it out, cool it to room temperature, put it into 5 vol% formaldehyde aqueous solution (adjust the pH to 2 with sulfuric acid), soak and solidify for 0.1-3 hours, rinse and dry. Finally, the double-layer coating is heat-treated at 120° C. for 0.1...

Embodiment 2

[0036] Dissolve 5g of polyvinyl alcohol Mowiol 117 with a degree of alcoholysis of 98% in 50g of hot water, and add 5.0g of SiO with a particle size of 20nm 2 , and drop 0.02g defoamer BYK021 to make PVA / SiO 2 / 50% water dispersion. 2g of hydroxyacrylic resin and 0.5g of partially methylated melamine were dissolved in 2g of butyl acetate, and 0.01g of p-toluenesulfonic acid was added. The solution was rolled onto a standard glass slide with a 30 μm wire bar. After the solvent is fully volatilized and the coating film loses its fluidity, spray a layer of PVA / SiO on it 2 / 17% dispersion. The uncrosslinked double-layer coating is placed in an oven at 90° C. for 0.1-2 hours. Take it out and cool it to room temperature, put it into 2.5 vol% glutaraldehyde aqueous solution (adjust the pH to 2 with hydrochloric acid) and soak for 0.1-3 hours, rinse and dry. Finally, the double-layer coating is heat-treated at 140° C. for 0.1-0.5 hours to fully cross-link the primer. The coating...

Embodiment 3

[0038] Dissolve 5 g of polyvinyl alcohol 1788 with an alcoholysis degree of 88% in 50 g of hot water, and add 3.5 g of ZnO with a particle size of 20 nm to make a PVA / ZnO / 41% dispersion. 2g of hydroxyacrylic resin and 0.2g of fully etherified melamine were dissolved in 5g of butyl acetate, and 0.01g of p-toluenesulfonic acid was added. The solution was rolled onto a standard glass slide with a 120 μm wire bar. After the solvent is fully volatilized and the coating film loses its fluidity, a layer of PVA / ZnO / 41% dispersion is coated on it with a 120 μm wire rod. After the upper liquid film is dried at room temperature, the uncrosslinked double-layer coating is placed in an oven at 70° C. for 0.5-5 hours. After taking it out, cool it to room temperature, put it into 5 vol% formaldehyde aqueous solution (adjust the pH to 2 with sulfuric acid), soak and solidify for 0.1-3 hours, rinse and dry. Finally, the double-layer coating is heat-treated at 120° C. for 0.1-0.5 hours to full...

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Abstract

The invention relates to a superhydrophilic / underwater superoleophobic coating material and a preparation method thereof. The coating material is composed of a primer layer and a finish coat layer, wherein the primer layer is mainly composed of a hydroxy acrylic resin and a curing agent thereof; the finish coat layer is composed of polyvinyl alcohol and nanoparticles; and the curing agent in the primer can produce chemical crosslinking reaction with the polyvinyl alcohol. The preparation method comprises the following steps: applying the primer layer on the substrate surface; applying the finish coat layer, and precrosslinking by drying at room temperature or low temperature to initiate the chemical bonding between the primer layer finish coat layer; soaking the coating in a crosslinking agent water solution for some time; and taking the coating out of the crosslinking agent water solution, and sufficiently curing the primer layer by drying at room temperature or high-heat treatment. The coating material obtained by the method has a gradient micro / nano structure surface, and has the advantages of outstanding superhydrophilicity and underwater superoleophobicity, high binding force with the substrate and favorable transparency. The coating material can be used as an antifogging coating, and can also be used as a self-cleaning antifouling coating on the surface of an underwater facility.

Description

technical field [0001] The invention relates to the field of new chemical materials, and relates to a composition of a superhydrophilic / underwater superoleophobic coating material and a preparation method thereof. Background technique [0002] Super-hydrophilic coating is a coating whose surface contact angle of water droplets is less than 10°. Water can easily spread on its surface to form a water film, which has outstanding anti-fog and self-cleaning properties. When it is used in an underwater environment, it exhibits superoleophobic properties, so it can also be used as an underwater superoleophobic self-cleaning coating. Currently, one class of underwater superoleophobic materials is polymer hydrogels containing hydrophilic groups or zwitterionic groups, such as polyethylene glycol, polyvinyl alcohol, chitosan, calcium alginate, and betaines. etc., see Chinese patents CN104804116A and CN104861755A. This kind of hydrogel material has good transparency and outstanding u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D129/04C09D133/00C09D5/16C08J3/24B05D5/00B05D7/24B05D3/10
CPCB05D3/107B05D5/00B05D7/24B05D7/544B05D2451/00B05D2502/00B05D2518/00B05D2601/20B05D2601/22B05D2601/24B05D2602/00C08J3/246C08J2329/04C08J2333/00C08J2429/04C08J2433/00C08K3/22C08K3/36C08K2003/2296C08K2201/003C08K2201/011C08L2201/10C09D5/16C09D5/1693C09D7/63C09D7/67C09D129/04C09D133/00C08L61/32C08K5/42B05D2420/01B05D2420/02
Inventor 周树学顾云娇
Owner FUDAN UNIV
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