Method for extracting collagen fibers from offal produced during tanning process

A technology of collagen fibers and leftovers, which is applied in the chemical post-treatment of fibers, fiber treatment, animal raw materials, etc., to achieve the effects of high extraction rate, reduced arrangement density, and reduced binding force

Inactive Publication Date: 2012-06-13
JIAXING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the above-mentioned existing leather waste recycling methods, the present invention provides a method for extracting textile and non-woven available collagen fibers from leather waste, which extracts collagen fibers with suitable linear density and length from leather waste. fiber to produce high value-added products to achieve the purpose of mass utilization of leather waste without causing secondary pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] From the solid waste produced by the tannery, select irregularly shaped and large-sized cowhide or pigskin wetblue leather trimming waste. First soak the wetblue leather waste for 36 hours. The soaking solution is composed of alkali, co-solvent and Surfactant composition, wherein the alkali is ammonia, the usage amount is 0.3% (accounting for waste mass ratio), the co-solvent is sodium salicylate, the usage amount is 0.5% (accounting for waste mass ratio), and the surfactant is ethoxylated Alkyl sodium sulfate, the usage amount is 0.3% (accounting for waste mass ratio). Then, the swollen leftovers were treated with ultrasonic equipment for 30 minutes, the frequency used was 40KHZ, and the power was 300W. Then slowly pass through the high-pressure jet device, and use three row thorn heads to impact the waste. The pressures used by the three row thorn heads are: 28bar, 35bar, 60bar, the aperture of the water needle plate used is 1mm, and the jet hole density is 16 holes / c...

Embodiment 2

[0027] From the solid waste produced by the tannery, select irregularly shaped and large-sized cowhide or pigskin wetblue leather trimming waste. First, soak the wetblue leather waste for 28 hours. The soaking solution is composed of alkali, cosolvent and Surfactant composition, wherein the alkali is NaOH, the usage amount is 0.2% (accounting for the waste mass ratio), the co-solvent is urea, the usage amount is 0.3% (accounting for the waste material mass ratio), the surfactant is JFC, and the usage amount is 0.5% (accounting for waste mass ratio). Then, the swollen leftovers were treated with ultrasonic equipment for 30 minutes, the frequency used was 60KHZ, and the power was 600W. Then slowly pass through the high-pressure jet device, and use three row thorn heads to impact the waste. The pressures used by the three row thorn heads are: 30bar, 40bar, 65bar, the aperture of the water needle plate used is 2mm, and the jet hole density is 16 holes / cm. The mesh number of the o...

Embodiment 3

[0034] From the solid waste produced by the tannery, select irregularly shaped and large-sized cowhide or pigskin wetblue leather trimming waste. First, soak the wetblue leather waste for 48 hours. The soaking solution is composed of alkali, co-solvent and Surfactant composition, wherein the alkali is sodium carbonate, the use amount is 0.25% (accounting for waste mass ratio), co-solvent is ethylene glycol, the use amount is 0.4% (accounting for waste mass ratio), surfactant is Pingping plus O, The amount used is 0.2% (accounting for waste mass ratio). Then, the swollen leftovers were treated with ultrasonic equipment for 30 minutes, the frequency used was 40KHZ, and the power was 300W. Then slowly pass through the high-pressure jet device, and use three row thorn heads to impact the waste. The pressures used by the three row thorn heads are: 25bar, 40bar, 60bar, the aperture of the water needle plate used is 1.5mm, and the jet hole density is 16 holes / cm. The mesh number of ...

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Abstract

The invention discloses a method for extracting collagen fibers from offal produced during a tanning process. At present, the offal produced during the tanning process is treated through a chemical treatment method which has the defects that though the product added value is higher, the treatment is complex, the cost is high, secondary pollution is generated, the offal utilization ratio is low, and a great quantity of leather waste cannot be effectively utilized all along. The method provided by the invention comprises the following steps: selecting blocky wet blue leather scrap, immersing the wet blue leather scrap in soda lye for 36 to 48 hours, treating the tumefied wet blue leather scrap with ultrasonic equipment for 20 to 30 min, passing the wet blue leather scrap through a high-pressure water jet device slowly, drying, and finally beating and opening through a cotton carding machine to ensure complete separation between the collagen fibers and obtain the collagen fibers. The invention mainly adopts the physical and mechanical method, so as to ensure that trivalent chromium cannot be converted into poisonous hexavalent chromium; environment pollution is avoided; and the extraction rate of collagen fiber approximately reaches 70 percent.

Description

[0001] technical field [0002] The invention relates to the treatment of leather waste produced in the tanning process, in particular to a method for extracting collagen fibers from the leftovers produced in the tanning process. Background technique [0003] my country's traditional tanning industry is mainly based on the blue leather process. In the entire tanning production process, the final product made only accounts for about 50% of the original leather weight, and the rest is a large amount of tanning waste. As a big country in tanning, my country produces more than 1.4 million tons of leather waste (including chrome-containing leather waste) every year, accounting for almost one-half of the world's total. , the amount of tanning solid waste is also increasing. Most of the waste is the dregs and dander produced during the processing of blue leather, such as trimming and smoothing. The main component is collagen. If it is not utilized Discarding not only wastes resource...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01C3/00D01B9/00
Inventor 钱程
Owner JIAXING UNIV
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