Preparation method of dual-purpose hide for hair and leather by formaldehyde-free chrome-free tanning

A chrome-free tanning and tanning technology, applied in the field of fur processing, can solve problems such as allergic dermatitis, stains, necrosis, affecting normal breathing, fetal deformity or stillbirth, etc. delicate effect

Active Publication Date: 2014-10-22
SICHUAN DEHUA LEATHER MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its adhesion, the hair is yellowed, and because the molecular structure of Tara extract is relatively large, the absorption rate of skin board is relatively low, and the water-bath tanning method will use more Tara extract, which will cause waste and increase production costs. It is necessary to study a method to replace the water bath tanning method, so as to achieve the purpose of saving Tara extract and reducing costs
[0008] Formaldehyde is one of the important materials in the chemical industry. It has a wide range of uses. It is used in the processes of synthetic resin, leather, pesticide, fumigation and anticorrosion. From the perspective of histology, formaldehyde is a good fixer. It has the advantages of less tissue shrinkage, less damage, good preservation of inherent substances, uniform fixation, strong penetrating power, hardening of tissue and improving tissue elasticity. Therefore, formaldehyde has a good effect on tanning fur leather. However, formaldehyde has Toxici

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] According to the size of the rabbit skin, coat, road, etc., group batches according to similar, and cut off the head and feet when batching. After batching, at room temperature, immerse 20 kg of raw skins of the same group after meat removal (each liter of water contains 0.3mL fungicide, 0.5mL HAC wetting agent, 15g sodium chloride), and the mass ratio of raw skins to water is 1:20, start the slotting rotation for 30 minutes, and then stop for 55 minutes every 5 minutes. After overnight, rotate for 30 minutes the next day to take out the raw material skin. The soaking is completed, and the next step is soreness; at 26℃, in every liter of water Add 0.8mL TS-80 degreaser to the water and put the raw skin into the water according to the mass ratio of water to raw skin 20:1. At the same time, add 0.7mL sulfuric acid and 0.5g sodium sulfite to each liter of water. Start the groove and rotate for 15 minutes and stir evenly. After that, stop for 55 minutes every 5 minutes of ro...

Embodiment 2

[0042] The water immersion, soreness, re-immersion, degreasing and acid immersion are exactly the same as those in Example 1.

[0043] The raw leather after pickling needs to be tanned first. At room temperature, add sodium chloride to the water, the content of sodium chloride in the water is 50g / L, put the raw material skin into the sodium chloride aqueous solution, the mass ratio of the raw material skin to the sodium chloride aqueous solution is 1:20, start After turning the groove for 5 minutes, add 0.3 mL of HAC penetrant and 0.5 g of sodium carbonate to each liter of sodium chloride aqueous solution. After starting the groove for 30 minutes, add 5 mL of per liter of sodium chloride aqueous solution. Fatty aldehyde tanning agent forms the initial kneading liquid, start the groove rotation for 30 minutes to mix the initial kneading liquid evenly, then stop for 55 minutes every 5 minutes of rotation, and continue for 6 times according to the rule of "rotating for 5 minutes-sto...

Embodiment 3

[0049] The water immersion, soreness, and re-immersion are exactly the same as in Example 1.

[0050] Degreasing step: At 40°C, take 100L of water, add 4.5Kg of sodium chloride, 60g of sodium carbonate, 140mL of TS-80 degreasing agent, and 160mL of JA-50 degreasing agent to the mixture to obtain a degreasing solution. Put 7Kg of raw skin into the degreasing solution At this time, the ratio of the mass of the raw skin to the degreasing liquid is about 1:15, and the other is the same as in Example 1, except that the notching is performed 5 times according to the rule of "rotating for 10 minutes-stopping for 50 minutes".

[0051] Pickling step: first prepare pickling solution, take 100L of water at 32℃, add 5.5Kg sodium chloride, 40mL HAC penetrant, 250mL formic acid, 7.0g 535 acid softening enzyme to form pickling solution. Put the defatted 5.3Kg raw skins into the pickling solution. The mass ratio of the raw skins to the pickling solution is 1:20. Start the slotting rotation. First,...

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PUM

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Abstract

The invention discloses a preparation method of dual-purpose hide for hair and leather by formaldehyde-free chrome-free tanning. The method mainly comprises the following improved operation steps: degreasing: degreasing by using a mixed solution of sodium chloride, sodium carbonate, TS-80 degreaser and JA-50 degreaser; pickling: carrying out secondary pickling by using sodium chloride, HAC penetrant, formic acid, 535 acidic softening enzyme, sulfuric acid and TS-80 degreaser; and tanning and retanning: carrying out tanning and retanning by using a tanning agent containing an aluminum tanning agent and a tanning extract, a fatty aldehyde tanning agent is used for primary tanning before tanning, and no aluminum tanning agent or alum is used in the tanning and retanning process of the raw hide subjected to primary tanning. By using the formaldehyde-free chrome-free tanning process, the product is free of heavy metals or free formaldehyde; the degreasing procedure is reinforced, thereby avoiding using the dry washer; and the spreading process is used instead of the traditional bath tanning process in the tanning and retanning procedure, thereby saving abundant water and reducing the use of the tanning extract.

Description

Technical field [0001] The embodiment of the present invention relates to the field of wool leather processing. More specifically, the embodiment of the present invention relates to a method for preparing a formaldehyde-free and chrome-free tanned dual-purpose leather. Background technique [0002] The dual-purpose fur of wool and leather has been studied since the 1970s, but the technology is immature. Chrome tanning is mainly used, and the suede effect of the tanned leather is poor. Entering the 21st century, my country's tanning technology has made great progress, both in production technology and production equipment have been significantly improved, but the production process is still mainly chrome tanning, supplemented by other processes, or chrome tanning + aldehyde tanning (More), chrome tanning + tannin tanning (less), and it is mainly used for sheep skin, because the sheep skin is thicker and slightly softer, it is suitable for dual-purpose wool leather. The dual-use of...

Claims

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Application Information

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IPC IPC(8): C14C3/28C14C3/16C14C3/10C14C1/08
Inventor 刘强李雪辉李宇柯悦
Owner SICHUAN DEHUA LEATHER MFG
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