Ultrasonic wave and microwave assisted pass-type metal salt tanning method

A microwave-assisted, metal salt technology, applied in the field of leather processing, can solve the problems of inability to achieve zero-chromium emission from chrome tanning, and achieve the effects of high viscosity, small changes in composition and properties, and strong acidity

Inactive Publication Date: 2017-12-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the chrome tanning solution can be reused in this method, after using the lye for a certain number of times, it cannot be reused due to the accumulation of chromium in the solution. The discharge of this part of the liquid

Method used

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  • Ultrasonic wave and microwave assisted pass-type metal salt tanning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] For the pickling bare hide with a thickness of 0.8mm, first use sodium carbonate to adjust the pH value of the pickling bare hide to 4.5, and then use a roller extruder to adjust the distance between the extrusion rollers to 60% of the initial thickness of the bare hide. ; Pass the extruded bare leather with the grain side down through the aluminum sulfate tanning solution, which contains 50g / L sodium chloride and 70g / L aluminum oxide, tanning for 10min under the action of 40KHz ultrasonic waves, and then tanning on the extrusion roller Mechanical extrusion is carried out under the condition that the distance between them is 40% of the initial thickness of the bare hide; repeated tanning in the above-mentioned aluminum sulfate tanning solution once, and no mechanical extrusion is carried out after the first repeated tanning; finally, after the tanning agent has penetrated The aluminum tanning operation is completed by heat-preserving the leather base under 30°C microwave...

Embodiment 2

[0036] For the pickling bare hide with a thickness of 0.9mm, first use sodium bicarbonate and sodium formate to adjust the pH value of the pickling bare hide to 3.5, and then use a roller extruder to adjust the distance between the extrusion rollers to 40% of the initial thickness of the bare hide Extruding; pass the extruded bare leather with the grain side down through zirconium sulfate tanning solution, which contains 60g / L sodium chloride and 60g / L zirconium dioxide, tanning for 5min under the action of 40KHz ultrasonic waves, and then extruding Mechanical extrusion is carried out under the condition that the distance between the pressing rollers is 60% of the initial thickness of the bare hide; repeated tanning in the above-mentioned zirconium sulfate tanning solution for 3 times, and no mechanical extrusion is carried out after the third repeated tanning; finally, the tanning will be completed Zirconium tanning is completed by irradiating microwaves at 40°C for 10 minutes...

Embodiment 3

[0038] For the pickling bare hide with a thickness of 1.5mm, first use sodium bicarbonate to adjust the pH value of the pickling bare hide to 5.0, and then use a roller extruder to adjust the distance between the extrusion rollers to 55% of the initial thickness of the bare hide. Pressing; put the extruded bare leather grain face down into chrome sulfate tanning solution, which contains 60g / L sodium chloride and 50g / L chromium trioxide, tanning for 3min under the action of 40KHz ultrasonic waves, and then extruding Mechanical extrusion is carried out under the condition that the distance between the pressing rollers is 50% of the initial thickness of the bare hide; repeated tanning in the above-mentioned chromium sulfate tanning solution once, and no mechanical extrusion is carried out after the first repeated tanning; finally, the tanning will be completed After the agent has penetrated, the leather base is placed under microwave irradiation at 40°C for 5 minutes, and the chro...

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Abstract

The invention provides an ultrasonic wave and microwave assisted pass-type metal salt tanning method. The method comprises the following four steps: (1) regulating the pH value of pickled pelt firstly to be at least 3.5, extruding by adopting a roller type extruding machine, and regulating the distance between the extrusion rollers to be 40%-60% of the initial thickness of the pickled pelt; (2) enabling the grain side of the pickled pelt after extrusion to face downwards to pass through a metal salt tanning solution containing sodium chloride, tanning under the action of 40 KHz ultrasonic waves for at least 1 min, extruding the crust leather by adopting the roller type extruding machine, and further regulating the distance between the extrusion rollers to be 40%-60% of the initial thickness of the pelt; (3) repeating the operations in the step (2) for 1-3 times, and no longer extruding by adopting the roller type extruding machine after the last time tanning; and (4) performing heat preservation on the crust leather after the completion of operations in the step (3) in a microwave field for at least 2 min at the heat preservation temperature of 30-60 DEG C. The ultrasonic wave and microwave assisted pass-type metal salt tanning method is applicable to tanning adopting various metal salts, the tanning time is short, and the physical and chemical property of the obtained leather have no obvious difference compared with that obtained by adopting the conventional method; besides, the tanning solution in the method is recyclable, and waste water containing a tanning agent is not discharged during the tanning process.

Description

technical field [0001] The invention belongs to the technical field of leather processing, and in particular relates to a through-type leather inorganic metal salt tanning method based on ultrasonic waves and microwaves without using drums. Background technique [0002] Tanning is the most important process in leather processing. After tanning, raw hide can be transformed into leather. Compared with raw hide, leather is more resistant to heat and humidity, better in chemical resistance and biodegradation, will not swell in water, and has certain formability, good air permeability, bending resistance and plumpness after drying. It is an excellent material for making shoes, clothing, furniture and bags. [0003] Generally speaking, tanning methods are divided into three types: inorganic tanning, organic tanning and combined tanning. Inorganic tanning is the use of metal salt tanning agents to tan bare hide and convert it into leather. At present, the tanning operation in th...

Claims

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Application Information

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IPC IPC(8): C14C3/28
CPCC14C3/28
Inventor 陈武勇张金伟吴佳城
Owner SICHUAN UNIV
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