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Ultrasonic-assisted through-type four-bath chromium tanning method with separated penetration and fixation

A fixed separation and ultrasonic technology, applied in the field of leather tanning, can solve the problems of long tanning time, achieve high tanning efficiency, reduce pollution, and simple process and operation

Inactive Publication Date: 2014-11-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these studies utilize ultrasonic assistance, they still use the drum tanning method, and the tanning time is still long

Method used

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  • Ultrasonic-assisted through-type four-bath chromium tanning method with separated penetration and fixation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] After pickling treatment, the acid skin used for the production of sheep shoe upper leather with a pH of about 2.5 and a thickness of 1.2mm is mechanically extruded to a moisture content of about 40%, and then the ultrasonic frequency is 28kHz and the temperature is 20°C. , Containing 10% chromium powder and 4% sodium chloride permeate (the first bath) for 5 minutes; mechanically extrude the permeated leather to a moisture content of about 40%, at an ultrasonic frequency of 28kHz and a temperature of 20 ℃, 2% sodium bicarbonate solution (the second bath) for 1 min; before the second infiltration, the fixed leather billet is mechanically extruded to a moisture content of about 40%, and then the ultrasonic frequency is 28kHz and the temperature is Infiltrate in permeate (the third bath) containing 10% chromium powder and 8% sodium chloride at 20°C for 5 minutes; before the second fixation, mechanically extrude the infiltrated leather billet to a moisture content of about 4...

Embodiment 2

[0032] After acid pickling treatment, the acid leather used for the production of goat shoe upper leather with a pH of about 2.5 and a thickness of 1.2mm is first mechanically extruded to a moisture content of about 45%, and then the ultrasonic frequency is 28kHz and the temperature is 35°C. , Containing 30% chromium powder and 7% sodium sulfate permeate (the first bath) for 1 min; mechanically extrude the permeated leather billet to a moisture content of about 45%, at an ultrasonic frequency of 28kHz and a temperature of 35°C , fixed in ammonia solution (the second bath) with a concentration of 1% for 2 minutes; before the second penetration, mechanically extrude the fixed leather billet to a moisture content of about 55%, and then in the ultrasonic frequency of 28kHz, the temperature is 35 ℃ , Infiltrate in the penetrating solution (the third bath) containing 20% ​​chromium powder and 7% sodium sulfate for 2 minutes; before the second fixation, mechanically extrude the infilt...

Embodiment 3

[0034] After pickling treatment, the pH is about 3.0 and the thickness is 0.5mm, which is used for the production of pig shoe lining leather. First, it is mechanically extruded until the moisture content is about 50%, and then the ultrasonic frequency is 28kHz and the temperature is 45℃. , Containing 10% chromium powder and 3% potassium chloride permeate (the first bath) for 1 min; mechanically extrude the permeated leather to a moisture content of about 50%, at an ultrasonic frequency of 28kHz and a temperature of 45 ℃, 1.5% sodium carbonate solution (the second bath) for 1 min; before the second infiltration, the fixed leather billet is mechanically extruded to a moisture content of about 50%, and then the ultrasonic frequency is 28kHz, the temperature Infiltrate in the permeate solution (the third bath) containing 20% ​​chromium powder and 3% potassium chloride at 20°C for 1 min; before the second fixation, mechanically extrude the infiltrated leather billet to a moisture co...

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Abstract

The invention discloses an ultrasonic-assisted through-type four-bath chromium tanning method with separated penetration and fixation. The method completes chromium tanning through the following four steps: 1, mechanically extruding acidic leather until the acidic leather has certain moisture content and then allowing the acidic leather to enter into a penetrating fluid (a first bath) on which an ultrasonic wave field acts for penetration; 2, mechanically extruding a penetrated leather blank until the leather blank has certain moisture content and then allowing the leather blank to enter into a fixing fluid (a second bath) on which the ultrasonic wave field acts for fixation; 3, mechanically extruding the fixed leather blank until the leather blank has certain moisture content and then allowing the leather blank to enter into the penetrating fluid (a third bath) on which the ultrasonic wave field acts for penetration; and 4, mechanically extruding the penetrated leather blank until the leather blank has certain moisture content and then allowing the leather blank to enter into the fixing fluid (a fourth bath) on which the ultrasonic wave field acts for fixation; wherein the extruded penetrating fluid and the extruded fixing fluid are returned to a system for cycle use. According to the invention, continuous chromium tanning operation can be realized, and a blue wet leather blank meeting requirements can be obtained; the total time for tanning is only 4 to 20 min; the penetrating fluid and the fixing fluid can be easily recycled, so zero discharge of chromium tanning waste liquid is realized.

Description

technical field [0001] The invention belongs to the technical field of leather tanning, and in particular relates to an ultrasonic-assisted four-bath chrome tanning method with zero discharge of chromium and neutral salt, penetration, fixation and separation. Background technique [0002] Tanning is an important process for converting raw hides into leather. Since Knapp invented the chrome tanning method in 1858, chrome tanned leather has the advantages of high moisture and heat resistance, washability, soft hand feeling, plump leather body, and storage resistance. It has always occupied a dominant position in the tanning industry, especially in the production of light leather. Chrome tanning can improve the shrinkage temperature, enzymolysis resistance and microbial resistance of leather, which is the basis for subsequent retanning, dyeing, fatliquoring and finishing of leather. [0003] At present, the main method of producing chrome tanned leather is drum tanning. This ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/28C14C3/06B01J19/10
Inventor 陈武勇张金伟滕博王瑜
Owner SICHUAN UNIV