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Hydrophobic moisture-resistant coating as well as preparation method and application thereof

A moisture-blocking and coating technology, applied in the coating and other directions, can solve the problems of poor stability and weak adhesion on the surface of the substrate, and achieve the effect of enhancing the bonding strength, excellent bonding, and increasing the diffusion path.

Active Publication Date: 2021-12-03
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, their weak adhesion to the substrate surface and poor stability limit their use as coatings for moisture barrier research, and there are still major problems

Method used

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  • Hydrophobic moisture-resistant coating as well as preparation method and application thereof
  • Hydrophobic moisture-resistant coating as well as preparation method and application thereof
  • Hydrophobic moisture-resistant coating as well as preparation method and application thereof

Examples

Experimental program
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preparation example Construction

[0024] The invention provides a preparation method of a hydrophobic and moisture-blocking coating, comprising the following steps;

[0025] Reacting dopamine hydrochloride with methacrylic substances to obtain 3-methacrylic acid-based dopamine;

[0026] Mixing the 3-methacrylic acid-based dopamine, polymerized monomers and azobisisobutyronitrile to carry out radical polymerization to obtain a dopamine copolymer, wherein the polymerized monomers are acrylates, acrylamides or silicones side chain group organics;

[0027] mixing the dopamine copolymer, organic solvent and filler to obtain a coating;

[0028] The substrate is subjected to oxygen plasma surface hydroxylation to obtain a pretreated substrate;

[0029] The coating is applied on the surface of the pretreated substrate to obtain the hydrophobic moisture barrier coating.

[0030] In the present invention, unless otherwise specified, the raw materials used are all commercially available products in the field.

[0031...

Embodiment 1

[0066] Weigh 5 g of dopamine hydrochloride, 250 mL of deionized water, and adjust the pH of the solution to 10; weigh 5 g of methacrylic acid chloride to mix and react, then acidify the reaction product and extract to obtain 3-methacryloyl dopamine.

[0067] Weigh 2.5g acrylic acid, 125g methacrylic acid-1H,1H-perfluorooctyl ester, 125g 3-methacryloyl dopamine, configure 8% azobisisobutyronitrile (AIBN) initiator, mix The solution was subjected to radical polymerization under nitrogen atmosphere to obtain dopamine copolymer-R 1 , dopamine copolymer-R 1 The structure of is as follows:

[0068]

[0069] x: 5 to 15, y: 10 to 100.

[0070] Synthetic dopamine copolymer-R 1 Dissolved in the mixed solution of butyl acetate and xylene (volume ratio 2:1), the mass fraction is 2%.

[0071] Take the reduced graphene into the paint, and the mass fraction of the reduced graphene is 0.2%. Magnetic stirring to make it fully mixed, that is, to obtain the hydrophobic dopamine copolymer...

Embodiment 2

[0086] The same as Example 1, the difference is only that the single reduced graphene filler in Example 1 is replaced with a mixed filler of reduced graphene and carbon nanotubes, and the total mass is equal to the quality of the reduced graphene in Example 1, and the reduced graphene The mass ratio of carbon nanotubes is 1:1.

[0087] Reference standard: GB / T 20313-2005; with reference to the method in Example 1, the moisture barrier coating samples were prepared, and the contact angle and moisture barrier effect were characterized. The results are shown in Tables 2.1 to 2.3. It can be seen from Table 2.1 that the dopamine copolymer mixed coating has good hydrophobicity.

[0088] Table 2.1 Contact angles of the hydrophobic moisture barrier coating samples and blank substrates prepared in Example 2

[0089]

[0090] Prepare 15 samples with a hydrophobic coating thickness of 20 μm according to the formula in Example 2, and use the industry standard moisture-proof cup for pa...

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Abstract

The invention provides a hydrophobic moisture-resistant coating as well as a preparation method and application thereof, and belongs to the technical field of coatings. The prepared dopamine copolymer has an excellent adhesion characteristic, the coating and the surface of a pretreated base material are combined together through chemical covalent bonds, excellent bonding performance is given to the hydrophobic moisture-resistant coating and a substrate, and the bonding strength of the coating and the substrate is greatly enhanced; by adding the filler, the diffusion path of water molecules is increased, the diffusion rate of the water molecules is effectively reduced, meanwhile, the interaction between the hydrophobic moisture-resistant coating and the water molecules is weak, the moisture adsorption capacity is low, and therefore the function of blocking moisture for a long time is achieved. The hydrophobic moisture-resistant coating provided by the invention can be applied to the surface and interface fields of building external wall thermal insulation, roof waterproof and thermal insulation integration, building boards, thermal insulation and moisture-resistant materials of refrigerator cars and refrigeration houses, external protective layers of precise instruments and the like, and can effectively avoid oxidation and swelling deformation of wrapped materials due to moisture absorption of the materials, and influences on the dimensional precision of precision parts.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a hydrophobic moisture-blocking coating and a preparation method and application thereof. Background technique [0002] Moisture blocking technology mainly focuses on the field of packaging and packaging, and has a wide range of application prospects in life. Hydrophilic porous polymer materials represented by polyurethane foam have been widely used in building exterior wall insulation, roof waterproofing and thermal insulation integration, building boards, refrigerated vehicles and Cold storage insulation materials, outer layers of precision instruments and other surface and interface fields. However, polyurethane foam is extremely sensitive to moisture, and has serious moisture absorption problems in practical applications. It will slowly absorb water vapor in the air, and the moisture contained in the porous structure will be released during use, especially for other materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/24C08F220/58C08F220/56C08F230/08C09D133/16C09D133/24C09D7/61C08J9/36C08L75/04
CPCC08F220/24C08F220/58C08F220/56C09D133/16C09D133/24C09D7/61C08J9/365C08K2201/011C08J2375/04C08J2433/24C08J2433/16C08F230/085C08K3/042C08K3/041
Inventor 周峰向阳阳于波于强亮杨武芳王晓龙
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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