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A method for enhancing the strength of two-layer leather by means of filling

A technology of leather and means, which is applied in the field of enhancing the strength of two-layer leather by means of filling, which can solve the problems of reducing product quality and use comfort, reducing the hygienic performance of two-layer leather, and unable to solve the use value, etc., to achieve good product stability, Good filling effect and improvement of filling uniformity

Active Publication Date: 2020-01-07
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of method improves the strength of the two-layer leather, it greatly reduces the hygienic performance of the two-layer leather, and reduces product quality and comfort.
In addition, this method is carried out in the dry finishing section of the two-layer leather, which cannot solve the phenomenon of loss of use value due to the reduction of strength in the preparation section and wet finishing section, and has certain limitations.
[0007] Therefore, a simple and suitable way to improve the mechanical properties of the split leather has not been found in the current actual production without affecting the quality of the split leather or reducing its unique hygienic properties.

Method used

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  • A method for enhancing the strength of two-layer leather by means of filling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Two-layer tanned leather filling reinforcement process is as follows:

[0024] Two-layer chrome tanned leather→squeezing→shaving→weighing→rewetting→washing→neutralization→filling→dyeing, fatliquoring→washing→drying→finishing→two-layer reinforced hide. The specific steps are:

[0025] (1) Select two-layer leather: select two-layer tanned leather through chrome tanning;

[0026] (2) Pre-filling treatment: the selected second-layer tanned leather is sequentially squeezed, shaved, weighed, re-wetted, washed, and neutralized. After neutralization, the pH of the second-layer leather is 4.5;

[0027] (3) Filling: Put the two-layer leather that has been treated before filling into the drum, and add water with a tare weight of 400%, adjust the temperature to 80°C, and then add 30% polyvinyl alcohol (the degree of polymerization is 1700, Alcoholysis degree is 70%), rotate 8h;

[0028] (4) Post-filling treatment: the filled two-layer leather is sequentially dyed, fatliquored, w...

Embodiment 2

[0030] Two-layer tanned leather filling reinforcement process is as follows:

[0031] Second-layer aldehyde tanned leather→squeezing→shaving→weighing→rewetting→washing→neutralization→filling→dyeing, fatliquoring→washing→drying→finishing→two-layer reinforced hide. The specific steps are:

[0032] (1) Select two-layer leather: select two-layer tanned leather through aldehyde tanning agent tanning;

[0033] (2) Pre-filling treatment: the selected second-layer tanned leather is squeezed, smoothed, weighed, re-wetted, washed, and neutralized in sequence. After neutralization, the pH of the second-layer leather is 9.0;

[0034] (3) Filling: Dissolve polyvinyl alcohol with a tare weight of 5% (the degree of polymerization is 300, and the degree of alcoholysis is 90%) in water with a tare weight of 100%, and the temperature is adjusted to 75°C. In the drum of the two-layer leather, rotate for 4 hours;

[0035] (4) Post-filling treatment: After the filled two-layer leather is sequen...

Embodiment 3

[0037] Two-layer tanned leather filling reinforcement process is as follows:

[0038] Two-layer zirconium tanned leather→squeezing→shaving→weighing→rewetting→washing→neutralization→filling→dyeing, fatliquoring→washing→drying→finishing→two-layer reinforced hide. The specific steps are:

[0039] (1) Select two-layer leather: select two-layer tanned leather tanned by zirconium tanning agent;

[0040] (2) Pre-filling treatment: the selected second-layer tanned leather is sequentially squeezed, shaved, weighed, re-wetted, washed, and neutralized. After neutralization, the pH of the second-layer leather is 6.0;

[0041] (3) Filling: Put the two-layer leather that has been treated before filling into the drum, and add water with a tare weight of 400%, adjust the temperature to 60°C, and then add 20% polyvinyl alcohol with a tare weight (the degree of polymerization is 1000, Alcoholysis degree is 75%), rotate 2h;

[0042] (4) Post-filling treatment: After the filled two-layer leath...

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Abstract

The invention discloses a method for enhancing the strength of two-layer leather by means of filling. The two-layer leather is sequentially processed through the pre-filling, filling and post-filling processes to obtain a two-layer reinforced leather blank; wherein, the specific method of filling is as follows: The pre-filled two-layer leather, water with a tare weight of 40% to 600%, and polyvinyl alcohol with a tare weight of 5% to 50% are added to the drum, and the temperature is adjusted to 50 to 80°C, and the rotation is 1 to 8 hours; the polyethylene used The degree of polymerization of alcohol is 100-2000, and the degree of alcoholysis is 50%-99%. By adopting the double-layer leather strengthening method of the present invention, the tear strength, tensile strength and bursting strength of the double-layer leather can be significantly improved, and the technical problems of complicated leather filling and insignificant strength improvement can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of leather treatment, and in particular relates to a method for enhancing the strength of two-layer leather by means of filling. Background technique [0002] The leather industry is a pillar industry in China's light industry. It uses animal skins as raw materials to process leather products suitable for people's life and production. During the tanning process of animal skin, components that are useless to tanning (such as epidermis, fat glands, fat, subcutaneous tissue, elastic fibers, reticular fibers, etc.) will be removed or destroyed, basically only leaving Useful components (collagen fibers), which we commonly call the dermis. According to the thickness and weaving of collagen fibers, the dermis can be divided into papillary layer (also known as grain layer) and reticular layer. In the actual leather processing and production process, animal skins are generally divided into 1 to 3 layers through the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08C14C3/10C14C3/28C14B1/58
CPCC14B1/58C14C3/08C14C3/10C14C3/28
Inventor 许维星石碧周建飞曾慧
Owner SICHUAN UNIV
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