Method for implementing leather fibre areosis and expansion by using supercritical carbonic anhydride

A carbon dioxide, leather fiber technology, applied in small raw hide/large raw hide/leather/fur treatment, leather/skin/leather/raw hide chemical treatment equipment, small raw hide/large hide/leather hide/fur chemical treatment, etc. Dry skin is difficult to return water, difficult to recycle and other problems, to achieve the effects of improved physical properties, high production efficiency and simple process

Inactive Publication Date: 2008-09-24
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method of using supercritical carbon dioxide to realize the loosening and swelling of leather

Method used

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  • Method for implementing leather fibre areosis and expansion by using supercritical carbonic anhydride
  • Method for implementing leather fibre areosis and expansion by using supercritical carbonic anhydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Soak the dry sheepskin in water to remove inorganic impurities on the surface and inside of the leather, dry it in a vacuum oven at 40°C for 4 hours after drying. Cut the large dry skin into 1cm×3cm blocks and medium-sized standard tensile splines, and do SEM and tensile experiments respectively.

[0023] Place the dry sheepskin slice sample at the bottom of a 50ml autoclave, seal the autoclave and transfer it to a heating mantle with a constant temperature of 38°C, introduce a small amount of carbon dioxide, drain the air in the autoclave, and then close the release valve ; Inject CO into the autoclave 2 To 12MPa, stop injecting carbon dioxide, close the inlet valve, hold constant temperature and pressure for 3 hours, then quickly depressurize to normal pressure, the decompression time is controlled at 6s, open the kettle and take out the dry sheepskin sample. The SEM electron micrographs of dry sheepskin before and after treatment are shown in figure 1 with figure...

Embodiment 2-5

[0025] In the autoclave, feed carbon dioxide to pressures of 8MP, 10Mpa, 14Mpa, and 16Mpa respectively, and the others are the same as in Example 1.

Embodiment 6-7

[0027] The temperature of the constant temperature heating mantle was adjusted to 33°C and 43°C respectively, and other operations were the same as in Example 1.

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Abstract

The invention relates to a method of utilizing supercritical carbon dioxide to achieve rarefaction and expansion of leather. The leather to be treated is put in the airtight reactor, the reaction condition is constant at 33 to 43 DEG C, carbon dioxide is introduced into the reactor till the reactor pressure reaches 8 to 16 Megapascal, the pressure is maintained about 1 to 5 hours and then is dropped to atmospheric pressure, and the treated leather is obtained. The invention solves the existing problems of the difficult rewatering of dried leather and the difficult recycling, achieves the rarefaction and expansion of leather fiber; the method of utilizing supercritical carbon dioxide to achieve rarefaction and expansion of leather has the advantages of the simple process, the convenient operation, the high production efficiency, no pollution, repeatedly recycling of carbon dioxide, and being utilized in leather industry and being a clean anhydrous production technology.

Description

(1) Technical field [0001] The invention relates to a method for realizing loose expansion of leather fibers by using supercritical carbon dioxide. (2) Background technology [0002] Tanning is a complex physical and chemical process involving hundreds of chemicals. The water consumption per ton of leather is at the upper limit of the average level of the industry in the world, and about 80-90 million tons of wastewater are generated every year. Because the wet processing of tanning production is carried out in water, many leather chemical raw materials have to be added to the water, and the raw leather cannot completely absorb the chemical raw materials in the water, so a large amount of complex and high-concentration organic wastewater is produced. Contains a large amount of toxic and harmful substances such as lime, dyes, proteins, salts, grease, ammonia nitrogen, sulfides, chromium salts, hair, leather dregs, mud sand, etc., and the pollution load is very large. Secondl...

Claims

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Application Information

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IPC IPC(8): C14C15/00
Inventor 许群陈加福杨秋艳秦树法
Owner ZHENGZHOU UNIV
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