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Method for constructing superhydrophobic coating on leather surface by layer-by-layer assembly

A super-hydrophobic coating, layer-by-layer assembly technology, applied in textiles, papermaking, fiber processing, etc., can solve problems such as limited application and easy hydrolysis, and achieve the effects of environmental friendliness, convenient operation, and improved contact angle.

Active Publication Date: 2016-04-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of leather collagen fibers that are easy to shrink at high temperature and easy to hydrolyze under strong alkaline conditions, the application of the above method for preparing fiber-based superhydrophobic coatings on leather surfaces is limited.

Method used

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  • Method for constructing superhydrophobic coating on leather surface by layer-by-layer assembly
  • Method for constructing superhydrophobic coating on leather surface by layer-by-layer assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1: Dilute the polymer emulsion (polyacrylate emulsion) with a solid content of 30% with water to a mass fraction of 2%, and spray it on the leather surface after dyeing, fatliquoring, cleaning, and drying, and spray 2 Times, the spraying amount is 10g / sf 2 , Dried at room temperature to form polymer latex film;

[0025] Step 2: Spray 0.5% hydrophobized silica (commercially available hydrophobized silica) ethanol dispersion on the surface of the polymer latex film, spray twice, and the spray amount is 10g / sf 2 , And placed in an oven at 30℃ to dry;

[0026] The spraying described in step 1 and step 2 are all air spraying methods, the pressure of the air compressor is 0.4 MPa, and the distance between the spray gun and the leather sample is 0.17 m.

Embodiment 2

[0028] Step 1: Dilute the polymer emulsion (polyurethane emulsion) with a solid content of 40% with water to a mass fraction of 6%, and spray it on the leather surface after dyeing, fatliquoring, cleaning, and drying, and spray twice. Spraying amount is 15g / sf 2 , Dried at room temperature to form polymer latex film;

[0029] Step 2: Spray 1.7% hydrophobized silica on the surface of the polymer latex film (after heptafluorooctyltrimethoxysilane, heptafluorooctyltriethoxysilane, tridecafluorooctyltrimethyl) Oxysilane or tridecafluorooctyltriethoxysilane modified silica) ethanol dispersion, sprayed twice, the spraying amount is 15g / sf 2 , And placed in an oven at 65℃ to dry;

[0030] The spraying described in step 1 and step 2 is air spraying, the pressure of the air compressor is 0.6 MPa, and the distance between the spray gun and the leather sample is 0.25 m.

Embodiment 3

[0032] Step 1: Dilute the polymer emulsion (epoxy resin emulsion) with a solid content of 50% with water to a mass fraction of 10%, and spray it on the leather surface after dyeing, fatliquoring, cleaning, and drying, and spray 2 Times, spraying volume is 20g / sf 2 , Dried at room temperature to form polymer latex film;

[0033] Step 2: Spray 3% hydrophobized silica (silica modified with long-chain alkyl silane with C atom number greater than or equal to 12) ethanol dispersion on the surface of polymer latex film, spray 2 Times, spraying volume is 20g / sf 2 , And placed in an oven at 100℃ to dry;

[0034] The spraying described in step 1 and step 2 are all air spraying methods, the pressure of the air compressor is 0.8MPa, and the distance between the spray gun and the leather sample is 0.33m.

[0035] See figure 1 with figure 2 In contrast, the leather coating obtained according to the method of the present invention without changing the leather processing process has a significant...

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Abstract

The invention relates to a method for forming a super-hydrophobic coating on a surface of leather in a layer-by-layer assembling mode. According to an existing method for forming a super-hydrophobic coating on the surface of a fiber-based material, specific devices, strong bases, organic solvents and the like are used, and accordingly shrinkage and hydrolysis of leather are caused. According to the method for building the super-hydrophobic coating on the surface of the leather in the layer-by-layer assembling mode, diluted polymer emulsion is sprayed onto the surface of the leather, so that a polymer latex film is formed, and the spray quantity is 10-20 g / sf2; ethyl alcohol dispersion liquid of hydrophobization silicon dioxide is sprayed to the surface of the polymer latex film, the spray quantity is 10-20 g / sf2, and the super-hydrophobic leather coating can be obtained after drying. The method for forming the super-hydrophobic coating on the surface of the leather in the layer-by-layer assembling mode is convenient and quick to operate, does not need expensive instruments and is environmentally friendly due to the fact that water or ethyl alcohol serves as solvents.

Description

Technical field [0001] The invention belongs to the technical field of leather finishing, and particularly relates to a method for constructing a super-hydrophobic coating on the surface of leather by layer-by-layer assembly. Background technique [0002] Leather is woven from collagen fibers. Collagen fibers contain a large number of hydrophilic groups such as amino groups, carboxyl groups, and hydroxyl groups. At the same time, a large number of surfactants, salts and other hydrophilic substances are used in the leather processing. , Resulting in poor hydrophobic properties of the leather. When the surface of leather products is stained with water, improper handling can easily cause the leather products to become hard or deformed, which not only affects the appearance of the leather products, but also reduces the wearing comfort of the leather products and restricts the leather products in special environments (rain and snow). Weather) or special applications (combat boots, co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M15/263D06M15/564D06M15/55D06M11/79
Inventor 马建中张晓艳鲍艳刘俊莉
Owner SHAANXI UNIV OF SCI & TECH
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