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Preparation method of high-wear-resistance self-repairing super-hydrophobic coating

A super-hydrophobic coating and self-repairing technology, which is applied in coatings and other directions, can solve the problems of loss of surface functionality and uneven chemical properties of super-hydrophobic surfaces, etc., and achieve the effect of simple method, super-hydrophobic recovery and high durability

Inactive Publication Date: 2021-05-25
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual complex environment, acidic and alkaline organic solvents and gases, oil and particle pollution, high temperature environment and ultraviolet radiation may lead to uneven changes in the chemical properties of the superhydrophobic surface, thereby losing the functionality of the surface.

Method used

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  • Preparation method of high-wear-resistance self-repairing super-hydrophobic coating
  • Preparation method of high-wear-resistance self-repairing super-hydrophobic coating
  • Preparation method of high-wear-resistance self-repairing super-hydrophobic coating

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Experimental program
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Embodiment 1

[0029] This embodiment relates to a preparation method of a highly wear-resistant self-repairing superhydrophobic coating, see attached figure 1 and Figure 5 Shown: Include the following steps:

[0030] Step 1: Add 0.6 mL of PFDTES into 60 mL of absolute ethanol, then disperse 2 mL of acetic acid in the PFDTES solution, and stir magnetically at room temperature for 2 h. Mix 4 mL of deionized water with 40 mL of ethanol, add 3 g of SiO 2 (20nm) particles and 3gCNT (30μm) were filled into ethanol aqueous solution, ultrasonically dispersed for 10min, then slowly dropped into the treated PFDTES solution and magnetically stirred at 50°C for 24h. The precipitate was centrifuged at 10,000 rpm for 10 minutes, then the modified filler was washed once with ethanol, and dried at 80°C for 12 hours to obtain superhydrophobic F-CNT and F-SiO 2 filler;

[0031] Step 2: Add 0.3g F-CNT, 2g HAR and IPDI (the mass ratio of HAR to IPDI is 4) into 4ml ethanol solution respectively. After ult...

Embodiment 2

[0033] This embodiment relates to a method for preparing a highly wear-resistant self-repairing superhydrophobic coating, comprising the following steps:

[0034] Step 1: Add 0.6 mL of PFDTES into 60 mL of absolute ethanol, then disperse 2 mL of acetic acid in the PFDTES solution, and stir magnetically at room temperature for 2 h. Mix 4 mL of deionized water with 40 mL of ethanol, add 3 g of SiO 2 (20nm) particles and 3g of CNT (20μm) were filled into ethanol aqueous solution, ultrasonically dispersed for 10min, then slowly dropped into the treated PFDTES solution and magnetically stirred at 50°C for 24h. The precipitate was centrifuged at 10,000 rpm for 10 minutes, then the modified filler was washed once with ethanol, and dried at 80°C for 12 hours to obtain superhydrophobic F-CNT and F-SiO 2 filler;

[0035] Step 2: Add 0.3g F-CNT, 2g HAR and IPDI (the mass ratio of HAR to IPDI is 4) into 4ml ethanol solution respectively. After ultrasonic treatment for 30 min, 0.3 g of ...

Embodiment 3

[0037] This embodiment relates to a method for preparing a highly wear-resistant self-repairing superhydrophobic coating, comprising the following steps:

[0038] Step 1: Add 0.6 mL of PFDTES into 60 mL of absolute ethanol, then disperse 2 mL of acetic acid in the PFDTES solution, and stir magnetically at room temperature for 2 h. Mix 4 mL of deionized water with 40 mL of ethanol, add 3 g of SiO 2 (20nm) particles and 3g of CNT (30μm) were filled into ethanol aqueous solution, ultrasonically dispersed for 10min, then slowly dropped into the treated PFDTES solution and magnetically stirred at 50°C for 24h. The precipitate was centrifuged at 10,000 rpm for 10 minutes, then the modified filler was washed once with ethanol, and dried at 80°C for 12 hours to obtain superhydrophobic F-CNT and F-SiO 2 filler;

[0039]Step 2, 0.4g F-CNT, 2g HAR and IPDI (the mass ratio of HAR to IPDI is 4) were added into 4ml ethanol solution respectively. After ultrasonic treatment for 30 min, 0.3...

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Abstract

The invention provides a preparation method of a high-wear-resistance self-repairing super-hydrophobic coating. The preparation method comprises the following steps: step 1, adding a low-surface-energy siloxane solution into absolute ethyl alcohol, dispersing acetic acid into the solution, conducting magnetic stirring to obtain a solution A, mixing deionized water and ethanol to obtain an aqueous ethanol solution, adding a filler into the aqueous ethanol solution, performing ultrasonic dispersion to obtain a solution B, dropwise adding the solution B into the solution A, performing magnetic stirring, and centrifuging, cleaning and drying a precipitate to obtain a micron-sized modified filler and a nanometer modified filler; and step 2, adding the micron-sized modified filler, polyol and a curing agent into an ethanol solution, carrying out ultrasonic treatment, adding the nanometer modified filler and a siloxane solution, conducting stirring, spraying a formed mixture onto a substrate by using a spray gun, and subjecting the coated substrate to standing in an oven to obtain the super-hydrophobic coating. The high-durability super-hydrophobic coating prepared by the method disclosed by the invention is still a super-hydrophobic surface after being abraded by abrasive paper, scraped by a knife, scraped by a steel wire ball and the like, which proves that the coating has very high durability.

Description

technical field [0001] The invention belongs to the technical field of super-hydrophobic coatings; in particular, it relates to a preparation method of a highly wear-resistant self-repairing super-hydrophobic coating. Background technique [0002] Non-wetting surfaces are ubiquitous in nature. A non-wetting surface with a static water contact angle (CA) greater than 150° and a rolling angle (SA) less than 10° is defined as a superhydrophobic surface. Superhydrophobic surfaces have outstanding performance in many fields such as solar panels, water droplet transmission, metal corrosion protection, sewage treatment and underwater drag reduction, so superhydrophobic surfaces have been widely concerned and studied. Generally, there are two strategies for preparing superhydrophobic surfaces: one is to use small molecules with low surface energy to modify the surface with special patterns, and the other is to construct a hierarchical structure on low surface energy materials. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D7/62
CPCC08K2201/011C09D183/04C09D7/62C09D7/67C09D7/69C08K9/06C08K3/36C08K3/041
Inventor 沈一洲李坤龙陶杰吴正维
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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