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Fluorinated polyurethane coating and preparation method of super-hydrophobic coating

A technology of fluorinated polyurethane and superhydrophobic coatings, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of unsatisfactory adhesion strength between coatings and substrates, limited mobility of low surface energy segments, and difficulty in blending and dispersing To achieve efficient preparation and other issues, to achieve the effects of good self-cleaning performance, excellent self-healing performance, and high surface migration ability

Active Publication Date: 2020-02-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the migration ability of the low surface energy chain segment is limited, resulting in short repair cycle and long repair time.
The soft superhydrophobic surface also makes it difficult to maintain its micro-nano structure
In addition, because the introduced low surface energy components are difficult to blend and disperse with other components, it is difficult to achieve efficient preparation, and the adhesion strength between the coating and the substrate is not ideal.

Method used

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  • Fluorinated polyurethane coating and preparation method of super-hydrophobic coating
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  • Fluorinated polyurethane coating and preparation method of super-hydrophobic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Superhydrophobic coating coated glass surface

[0040](1) Glass surface pretreatment: soak the glass plate in 2.5M NaOH solution for 24 hours, take it out and sonicate it in distilled water for 10 minutes. Then the glass plate was soaked in 0.1M HCl solution for 15 minutes, and after taking it out, it was ultrasonicated in distilled water and methanol for 10 minutes respectively. Finally, it was washed several times with distilled water and dried in an oven for later use.

[0041] (2) Preparation of fluorinated mercaptan prepolymer: Add 4.89 g of pentaerythritol tetramercapto propionate, 10.56 g of 2-(perfluorooctyl) ethyl methacrylate, and 0.1 g of 184 initiator in the reactor , Acetone 15g. React for 40 minutes under ultraviolet light and normal temperature conditions. The free radical addition thiol click reaction initiated by the photoinitiator has the characteristics of high-efficiency reaction. The infrared test shows that the infrared peaks of the e...

Embodiment 2

[0046] Embodiment 2: superhydrophobic coating coats PET fiber cloth

[0047] (1) Preparation of fluorinated mercaptan prepolymer: 3.98 g of trimethylolpropane trimercaptopropyl ester, 5.18 g of 2-(perfluorooctyl) ethyl methacrylate, and 184 Agent 0.08g, acetone 7.33g. React for 40 minutes under ultraviolet light and normal temperature conditions.

[0048] (2) Preparation of fluorinated polyurethane coating: Add 0.28 g of 4,4'-dicyclohexylmethane diisocyanate successively in a new reactor, dehydrated polytetrahydrofuran diol (M n =1000) 0.5g, dehydrated acetone 0.39g, 1 drop of dibutyltin dilaurate. The reaction was carried out at 60°C for 2 hours. Then, 0.195 g of the fluorinated thiol prepolymer prepared in (1) was added to the reactor, and acetone was added until a well-dispersed suspension was obtained, and the reaction was continued at 60° C. for 2 h. Finally, 0.037 g of chain extender neopentyl glycol was added, and the reaction was continued for 2 hours.

[0049] (3...

Embodiment 3

[0052] Embodiment 3: superhydrophobic coating coats PC surface (without chain extender)

[0053] (1) Preparation of fluorinated mercaptan prepolymer: add hexa(3-mercaptopropionic acid) dipentaerythritol ester 7.83g, 2-(perfluorooctyl) ethyl methacrylate 20.72g successively in the reactor, 0.157g of 184 initiator, 57.1g of acetone. React for 40 minutes under ultraviolet light and normal temperature conditions.

[0054] (2) Preparation of fluorinated polyurethane coating: add isophorone diisocyanate 0.22g successively in new reactor, dehydrated polyoxypropylene glycol (M n =1000) 0.75g, dehydrated acetone 0.97g, 1 drop of triethylamine. The reaction was carried out at 80°C for 2 hours. Then, 0.97 g of the fluorinated mercaptan prepolymer prepared in (1) was added to the reactor, and acetone was added until a well-dispersed suspension was obtained, and the reaction was continued at 80° C. for 2 h.

[0055] (3) Preparation of super-hydrophobic coating: Add 0.394 g of hydrophil...

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Abstract

The invention relates to a preparation method of a fluorinated polyurethane coating and a super-hydrophobic coating, and the method comprises the following steps: preparing a mercaptan prepolymer witha long fluoroalkane chain, and inoculating the fluoromercaptan prepolymer into a polyurethane prepolymer through a simple polyurethane reaction to obtain the fluorinated polyurethane coating; blending and dispersing nanoparticles and the fluorinated polyurethane coating according to a certain ratio, spraying, brushing or impregnating the mixture on the surface of a base material, and after a solvent is completely volatilized, putting the coating in a 70 DEG C drying oven for heat treatment for 5 hours to obtain the super-hydrophobic coating. The coating has high abrasion resistance, and afterthe coating is completely damaged, the super-hydrophobic performance of the coating can be recovered to a large extent within a short time through heating.

Description

technical field [0001] The invention belongs to the technical field of superhydrophobic coating materials, and relates to a preparation method of a fluorinated polyurethane coating and a superhydrophobic coating. Background technique [0002] Inspired by the hydrophobic effect of lotus leaves, water flies, butterfly wings, etc. in nature, artificial superhydrophobic materials have been deeply studied and have been greatly developed. The field has broad application prospects. According to the Wenzel-Cassie theory, it is generally believed that the realization of superhydrophobic properties depends on the construction of micro-nano multilevel rough structures and the use of low surface energy substances. Common preparation methods for superhydrophobic surfaces include: etching, photolithography, 3D printing, chemical deposition, self-assembly, in situ growth, in situ reduction, microphase separation, nanoparticle accumulation, etc. Because its micro-nano rough structure is m...

Claims

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Application Information

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IPC IPC(8): C09D175/06C09D175/08C08G18/32C08G18/12C08G18/40C08G18/42C08G18/48C08G18/62C08G18/66C09D7/61
CPCC09D175/06C09D175/08C09D7/61C08G18/12C08G18/6674C08G18/4277C08G18/4063C08G18/6279C08G18/664C08G18/4854C08G18/4825C08K2201/011C08G18/3206C08K3/36
Inventor 张秋禹付康张和鹏张宝亮
Owner NORTHWESTERN POLYTECHNICAL UNIV
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