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A kind of cowhide processing method

A processing method and technology of cowhide, applied in leather surface treatment, tanning treatment, small raw hide/large raw hide/leather/fur treatment, etc., can solve the problems of low molecular weight, inability to improve leather elasticity, etc., and achieve the effect of improving elasticity

Active Publication Date: 2019-07-05
广东艾弗尼品牌管理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the molecular weight of isocyanate is relatively low, and it can effectively cross-link with collagen molecules, thereby increasing the shrinkage temperature of leather, but it cannot improve the elasticity of leather

Method used

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  • A kind of cowhide processing method
  • A kind of cowhide processing method
  • A kind of cowhide processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This embodiment provides a polyurethane finishing agent S1, its preparation method and a cowhide treatment method using the polyurethane finishing agent.

[0034] The preparation method of described polyurethane finishing agent S1 comprises the following steps:

[0035] S11: A reactant composed of 0.1mol of polyoxypropylene triol (abbreviated as PPG) with a functionality of Fn=3 and a number average molecular weight of Mn=1000g / mol and 0.3mol of isophorone diisocyanate (abbreviated as IPDI) And the dibutyltin dilaurate (English abbreviation DBTDL) catalyst of 20ppm joins in the there-necked flask of a 1000ml;

[0036] S12: Under the condition of an 85°C oil bath, mechanically stir the reactants in the three-necked flask. After 2 hours of reaction, the polyurethane prepolymer formed by the reaction is cooled to room temperature. The schematic diagram of the chemical reaction is as follows figure 2 As shown, the PPG and IPDI in the polyurethane prepolymer are cross-link...

Embodiment 2

[0061] This embodiment provides a polyurethane finishing agent S2, its preparation method and a cowhide treatment method using the polyurethane finishing agent.

[0062] The preparation method of described polyurethane finishing agent S2 comprises the following steps:

[0063] S21: Reactant composed of 0.1 mol of polyoxyethylene ether triol with functionality Fn=3, number average molecular weight Mn=4000g / mol, 0.3 mol of cyclohexane dimethyl diisocyanate and 50 ppm of dibutyltin dilaurate Catalyst joins in the there-necked flask of a 1000ml;

[0064] S22: Under the condition of an oil bath at 90°C, mechanically stir the reactants in the three-necked flask, and after 3 hours of reaction, cool down the polyurethane prepolymer formed by the reaction to room temperature, and the polymer in the polyurethane prepolymer Oxyethylene ether triol and cyclohexane dimethyl diisocyanate crosslinked;

[0065] S23: using ethanol to dilute the polyurethane prepolymer to a solution with a cu...

Embodiment 3

[0082] This embodiment provides a polyurethane finishing agent S3, its preparation method and a cowhide treatment method using the polyurethane finishing agent.

[0083] The preparation method of described polyurethane finishing agent S3 comprises the following steps:

[0084] S31: A reactant composed of 0.1 mol of polyoxypropylene diol (abbreviated as PEG) and 0.2 mol of toluene diisocyanate (abbreviated as TDI) with number average molecular weight Mn=8000g / mol and 100ppm The dibutyltin dilaurate catalyst joins in a 1000ml there-necked flask;

[0085] S32: Under the condition of an oil bath at 90°C, mechanically stir the reactants in the three-necked flask, and after 4 hours of reaction, cool down the polyurethane prepolymer formed by the reaction to room temperature, and the PEG in the polyurethane prepolymer and TDI cross-connect;

[0086] S33: using isopropanol to dilute the polyurethane prepolymer to a solution with a curing amount of 50%;

[0087] S34: Adding 0.3 mol ...

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Abstract

The invention discloses a cow leather treatment method. The cow leather treatment method includes the following steps that in the tanning and finishing process, cow leather wet blue skin is used as a raw material to be put into a revolving drum, the mass of the cow leather wet blue skin is used as a datum mass, 100%-200% of water is added at first and then 6%-16% of a polyurethane finishing agent is added for treatment; 1% of pigment is added for treatment by 1-2 hours; dewatering is performed and 8%-15% of grease is added for treatment by 1-1.5 hours at the temperature of 50 DEG C; treated cow leather is taken out, a vacuum ironing device is used for ironing the cow leather for 3-4 minutes at the temperature of 40 DEG C, and then the cow leather is taken out for suspending and drying; then water is sprayed onto the inner surface of the dried cow leather, and the moisture content of the cow leather is made to reach 10%-15%; and mechanical vibration is adopted for staking of the cow leather, the cow leather surface is decorated and ground flat, then color coating / spraying treatment is carried out, and accordingly the cow leather treated through the method can be obtained after ironing. According to the cow leather treatment method provided by the method, an elastic structure can be formed in collagen fibers of the treated cow leather, and the leather elasticity is improved.

Description

technical field [0001] The invention relates to a method for preparing a leather finishing agent, in particular to a method for treating cowhide. Background technique [0002] In the leather manufacturing industry, especially the handbag product manufacturing industry, the elastic recovery performance of cowhide is very important. This performance not only affects the appearance of the product but also affects the function of the product. [0003] In the existing leather treatment process, the leather is filled with silicone finishing agent or wax or oil to make it soft and improve its elastic recovery. However, the elastic recovery of the leather obtained by these treatments is not durable. Such as figure 1 As shown, after the cowhide is filled with the existing leather treatment process, the collagen fibers 11 of the cowhide are filled with filling substances 12; Different degrees of extrusion, while forming new chemical bonds 13 between collagen fibers 11, lead to thin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/22C14C3/14C14B1/04C14C11/00
CPCC14B1/04C14B2700/14C14B2700/27C14C3/14C14C3/22C14C11/00
Inventor 胡金莲邓申伟韩建平胡霄韩颜庭
Owner 广东艾弗尼品牌管理有限公司