Durable superhydrophobic coating

A technology of coatings and nano-additives, applied in coatings, fiber treatment, textiles and papermaking, etc., can solve problems such as cumbersome preparation process, high-cost coating coating chemistry and environmental tolerance, coating safety and comfort , to achieve high durability, excellent long-term tolerance, simple application and effective effect

Inactive Publication Date: 2018-10-23
AGENCY FOR SCI TECH & RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although RGO-modified organopolysiloxanes exhibit excellent properties, there are limitations, including tedious preparation of vinyl-functionalized RGO and limited Si-H groups available for reaction with polymer matrices.
[0007] In this regard, although extensive efforts have been made to achieve superhydrophobic textile coatings, there are still challenging issues such as high cost of materials, mechanical properties of coatings, chemical and environmental resistance of coatings, Coated Safety and Comfort

Method used

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  • Durable superhydrophobic coating
  • Durable superhydrophobic coating
  • Durable superhydrophobic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0180] Example 1: Materials and methods

[0181] Material

[0182] Poly(methylhydrogensiloxane) (average Mn 1,700-3,200, PMHS), poly(dimethylsiloxane-co-methylhydrogensiloxane) (trimethylsilyl-terminated, (PDMS / PMHS), (Mn is about 13,000, methylhydrogensiloxane accounts for 3-4mol%) is purchased from Sigma-Aldrich. The clay used is alkyl quaternary ammonium salt bentonite "CLOISITE 30B". Other chemicals are purchased from Sigma -Aldrich and used as is.Water was purified using Millipore Milli-Q water system.

[0183] method

[0184] Scanning electron microscope (SEM) images were taken using a JEOL JSM 6700F operating at an accelerating voltage of 5.0 kV. Contact angle (CA) measurements were performed on a ramé-hart contact angle goniometer using a droplet volume of 5 μL. Fourier transform infrared (FTIR) spectroscopy was performed on a Bruker VERTEX 70 instrument in ATR mode at 4 cm -1 The resolution record was accumulated 32 times.

Embodiment 2

[0185] Embodiment 2: synthesis

Embodiment 2A

[0186] Example 2A: Preparation of Vinylsilane Functionalized Silica Nanoparticles (SiNPs)

[0187] Briefly, tetraethoxysilane (TEOS, 10 mL) and ammonium hydroxide (10 mL) were dissolved in a solution of ethanol / water (428 mL / 60 mL, v / v) and gently stirred at 30°C for 2 hours. The white product was washed 4 times with ethanol and distilled water, respectively. The resulting surfactant-free SiNPs were dried overnight in a vacuum oven at 40 °C to remove the remaining solvent. Then, SiNPs (1.00 g) were refluxed in 80.00 mL of anhydrous toluene with 0.25 mL (1.00 mmol) of trimethoxy(vinyl)silane for 20 hours to produce vinylsilane-functionalized SiNPs.

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Abstract

The invention relates to a polymeric coating material comprising a surface-functionalized such as vinyl functionalized nanoadditive covalently bound to an organopolysiloxane, such as poly(methylhydrosiloxane) (PMHS), wherein the nanoadditive comprises (a) a nanoadditive substrate and (b) a linker covalently bound by a silyloxy moiety to the nanoadditive substrate at one end and said organopolysiloxane at the other end. The invention also relates to a method of making such a coating material, the use of such a coating material, a method for coating a substrate with such a coating material, anda coated substrate obtainable by such a method.

Description

technical field [0001] The present invention relates to coatings for superhydrophobic coatings. The invention also relates to methods of making such coatings. Background technique [0002] Superhydrophobic textiles are attractive due to their wide range of applications in surgical tools, medical devices, textiles (such as swimwear and military apparel), maritime industry, and environmental applications. Currently, the main problems in the commercialization of superhydrophobic textiles are the high overall manufacturing cost, low mechanical strength, and poor durability of coatings on textile substrates. Therefore, current approaches focus on how to use cost-effective materials to achieve superhydrophobicity with enhanced long-term durability. Moreover, in recent years, imitating the hierarchical morphology of lotus leaves has become a major strategy to generate superhydrophobic textiles, which involves introducing coatings with low surface energy or creating special morpho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/38C09D183/04D06M15/643
CPCC09D183/04D06M15/643C09D5/28C08K3/346C08G77/12C09D7/40C08K3/36C08K5/549C08K2201/005C08K2201/011C08K3/041C08G77/16C08K9/06
Inventor 严宏徐建伟叶群周慧
Owner AGENCY FOR SCI TECH & RES
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