Flexible, breathable and wear-resistant leather coating layer and preparation method thereof

A leather and coating technology, applied in the field of leather coating preparation, can solve the problems of poor air permeability and flexibility of leather, increase difficulty and production cost, etc., and achieve the effect of improving wear resistance and good air permeability

Active Publication Date: 2019-10-22
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are two main methods for improving the wear resistance of leather finishing materials: 1. By introducing "hard segment" polymers into the base material of the finishing agent or increasing the degree of cross-linking of the matrix, by enhancing the strength and hardness of the finishing material, Improve the wear resistance of leather, but this method will easily lead to poor air permeability and flexibility of leather
2. Improve the wear resistance of leather by introducing nano-materials into the finishing agent matrix. This method can use the characteristics of nano-materials to improve the wear-resistance of leather and give it certain functionality. However, nano-materials are very easy to wear. Aggregation, so complex functional modification is often required, which increases the difficulty and production cost in the actual application process

Method used

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preparation example Construction

[0021] The preparation method of the flexible, breathable and wear-resistant leather coating of the present invention specifically comprises the following steps:

[0022] (1) Preparation of composite emulsion: Dissolve a certain amount of polyvinyl alcohol in water, and stir until completely dissolved at 90°C to 100°C to obtain an aqueous solution of polyvinyl alcohol, which can optionally be added to the transparent aqueous solution of polyvinyl alcohol A certain amount of modifying agent is added to obtain modified polyvinyl alcohol aqueous solution. The modified polyvinyl alcohol aqueous solution is added into the coating agent matrix (polymer) emulsion at a certain temperature under the stirring condition and stirred for a certain period of time to obtain the modified polyvinyl alcohol / finishing agent matrix composite emulsion.

[0023] (2) Preparation of flexible, breathable and wear-resistant leather coating: first, immerse the leather to be treated in water at a certain...

Embodiment 1

[0032] (1) Preparation of composite emulsion: 1 part of polyvinyl alcohol was weighed and dissolved in 10 parts of water, and stirred at 90°C until the polyvinyl alcohol was completely dissolved to obtain a transparent aqueous solution of polyvinyl alcohol. Add polyvinyl alcohol aqueous solution to 20 parts of aqueous polyurethane emulsion prepared from isophorone diisocyanate and polytetrahydrofuran ether glycol at a mass ratio of 1:2, stir and blend at 70°C for 2 hours to obtain polyvinyl alcohol / water-based polyurethane Complex emulsion.

[0033] (2) Preparation of flexible, breathable and wear-resistant leather coating: first, immerse the leather to be treated in water at 40°C for wetting; secondly, dilute the polyvinyl alcohol / water-based polyurethane composite emulsion obtained in the previous step with three times of water Finally, it is applied to the water-wet leather surface by spraying. Finally, the coated leather sample was immediately frozen with liquid nitrogen,...

Embodiment 2

[0036] (1) Preparation of composite emulsion: Weigh 0.92 parts of polyvinyl alcohol and dissolve it in 10 parts of water, stir at 95°C until the polyvinyl alcohol is completely dissolved, then add 0.08 parts of glutaraldehyde to the transparent polyvinyl alcohol solution and 0.05 parts nano-SiO 2 , to obtain modified polyvinyl alcohol aqueous solution. Add the modified polyvinyl alcohol aqueous solution to 19 parts of aqueous polyurethane emulsion prepared by isophorone diisocyanate and polytetrahydrofuran ether diol in a mass ratio of 1:2, and stir at 75°C for 2 hours to obtain the modified polyvinyl alcohol. Vinyl alcohol / water-based polyurethane compound emulsion.

[0037] (2) Preparation of flexible, breathable and wear-resistant leather coating: firstly, immerse the leather to be treated in 70°C water for wetting; secondly, add three After diluting with water, it is applied to the surface of leather wetted by water by spraying. Finally, the coated leather sample was im...

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Abstract

The invention provides a flexible, breathable and wear-resistant leather coating layer and a preparation method thereof. The preparation method includes the steps of firstly, dissolving polyvinyl alcohol into water to obtain a polyvinyl alcohol aqueous solution, adding the polyvinyl alcohol aqueous solution into a coating agent matrix emulsion while stirring, and stirring to obtain a polyvinyl alcohol / coating agent matrix composite emulsion; secondly, wetting the surface of to-be-treated leather, spraying the polyvinyl alcohol / coating agent matrix composite emulsion to the surface of the wetted leather, immediately performing a freezing-thawing cycle on the coated leather repeatedly, and drying at room temperature to form a film. The leather coating layer prepared by the method has a three-dimensional porous network structure, so that the wear resistance of the leather can be evidently increased while the flexibility and breathability of the leather are guaranteed effectively.

Description

technical field [0001] The invention relates to a preparation method of a leather coating, in particular to a flexible, breathable and wear-resistant leather coating and a preparation method thereof. Background technique [0002] Leather is tightly woven by collagen fibers, and collagen fibers are composed of collagen with a linear polymer structure, so its strength is low, resulting in poor wear resistance of leather. As the last process of leather processing, leather finishing plays a role in many aspects such as beautiful leather surface and improving the performance of leather products. The quality of coating wear resistance directly determines the application range of leather. Therefore, the study of wear resistance leather finishing Materials, prolonging the service life of leather is of great significance for the development of its industry. At present, there are two main methods for improving the wear resistance of leather finishing materials: 1. By introducing "har...

Claims

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Application Information

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IPC IPC(8): D06N3/04D06N3/00D06N3/14
CPCD06N3/04D06N3/0018D06N3/009D06N3/0077D06N3/0063D06N3/0061D06N3/14D06N3/042D06N2211/28D06N2209/123D06N2209/1685D06N2209/1642
Inventor 刘超林阳殷青鲍艳董雨菲柳杨
Owner SHAANXI UNIV OF SCI & TECH
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