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Leather pretreatment method

A pretreatment and leather technology, applied in leather surface treatment, small raw hide/big raw hide/leather/fur treatment, leather degreasing, etc., can solve the problems of decolorization, dyeing is not firm, etc., to achieve high quality, soft and uniform texture, high quality uniform effect

Inactive Publication Date: 2018-06-08
成都岚牌辛普皮业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the leather retanning processing method of the invention, by adjusting the chrome retanning process, using a suitable environmentally friendly tanning agent, reducing the chromium content in the chrome solution to improve the fullness and firmness of the leather, but in the actual production process may be There will be weak dyeing, which will cause discoloration during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A leather pretreatment process comprising the following steps,

[0035] Step 1: Degreasing and softening, add 90 parts by weight of water at a temperature of 50°C to the drum, then put the leather into the drum, add degreasing agent to the drum and adjust the pH to 4.5~4.8 overnight, then add 0.4 parts of baking soda, and set the drum to automatically stop for 30 minutes, turn for 10 minutes, and rotate for 120 minutes. The degreasing agent includes 0.1 parts of alkaline degreasing agent, 2 parts of alkaline additives, 0.2 parts of Pingpingjia, and 3 parts of softening enzyme;

[0036] Step 2: Washing and pre-greasing, drain the degreased and softened water and continue to add 90 parts of water with a temperature of 42 °C to the drum, then add 1 part of disodium terephthalic acid, and the drum Stop after turning for 30 minutes, then continue to add 2 parts of softening and fatliquoring agent, 2 parts of phospholipid SQS, stop after the drum starts to rotate for 30 minut...

Embodiment 2

[0043] A leather pretreatment process comprising the following steps,

[0044] Step 1: Degreasing and softening, add 90 parts by weight of water at a temperature of 50°C to the drum, then put the leather into the drum, add degreasing agent to the drum and adjust the pH to 4.5~4.8 overnight, then add 0.5 parts of baking soda, set the drum to automatically stop for 30 minutes, turn for 10 minutes, and rotate for 120 minutes. The degreasing agent includes 0.12 parts of alkaline degreasing agent, 2.2 parts of alkaline additives, 0.4 parts of Pingpingjia, and 2.5 parts of softening enzyme;

[0045] Step 2: Washing and pre-greasing, drain the degreased and softened water and continue to add 95 parts of water with a temperature of 44 °C to the drum, then add 1.2 parts of disodium terephthalic acid, and the drum Stop after turning for 30 minutes, then continue to add 2.5 parts of softening and fatliquoring agent, 2.5 parts of phospholipid SQS, stop after the drum starts to rotate for ...

Embodiment 3

[0052] A leather pretreatment process comprising the following steps,

[0053] Step 1: Degreasing and softening, add 92 parts by weight of water at a temperature of 50°C to the drum, then put the leather into the drum, add degreasing agent to the drum and adjust the pH to 4.5~4.8 overnight, then add 0.4 parts of baking soda, set the drum to automatically stop for 30 minutes, turn for 10 minutes, and turn for 120 minutes. The degreasing agent includes 0.12 parts of alkaline degreasing agent, 2.5 parts of alkaline additives, 0.3 parts of Pingpingjia, 3.5 parts of softening enzyme and 0.4 parts of baking soda;

[0054] Step 2: Washing and pre-greasing, drain the degreased and softened water and continue to add 902 parts of water with a temperature of 43°C to the drum, then add 1.2 parts of disodium terephthalic acid, and the drum Stop after turning for 30 minutes, then continue to add 2.5 parts of softening and fatliquoring agent, 2.5 parts of phospholipid SQS, stop after the dru...

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PUM

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Abstract

The invention discloses a leather pretreatment method. The leather pretreatment method comprises degreasing softening, washing water pre-fatliquoring, neutralizing, washing, dyeing fatliquoring, filling and cold water supplement. In the degreasing, an alkaline degreasing agent, an alkaline aid and peregal produce synergism so that excellent degreasing effects are realized. The produced leather hassoft and uniform texture. Formic acid and sodium formate can form a buffer pair to increase the stability of the pretreatment system. The leather pretreatment method achieves the stable pretreatmenteffect on the leather and has good dyeing effects.

Description

technical field [0001] The invention relates to the technical field of leather production, in particular to a leather pretreatment process. Background technique [0002] Leather is denatured and non-perishable animal skin obtained through physical and chemical processing such as depilation and tanning. The existing basic process of tanning is as follows: pre-tanning raw material hides, then chrome tanning, wet blue leather, washing, squeezing, and peeling, then chrome retanning, alkali extraction, neutralization, dyeing and esterification, Finally, the color is fixed, and the finishing is made into finished leather. [0003] The Chinese patent with the notification number CN102517409B discloses a leather retanning method, which includes water washing, rewetting and softening, chrome retanning, neutralization, dyeing and filling, esterification, overdyeing and other processes, and finally drying, finishing and finishing , to obtain finished leather. [0004] In the leather...

Claims

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Application Information

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IPC IPC(8): C14C1/04C14C5/00C14C9/02C14C11/00
CPCC14C1/04C14C5/00C14C9/02C14C11/00
Inventor 罗小军
Owner 成都岚牌辛普皮业有限公司
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