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Method for improving absorptivity of chrome tanning agent in tanning process through microwave irradiation pretreatment

A technology of microwave irradiation and chrome tanning agent, applied in chemical/physical process, chemical/physical/physical-chemical process, chemical/physical/physical-chemical process of applying energy, etc., to reduce production cost, reduce sewage treatment load and Cost and high absorption rate

Inactive Publication Date: 2020-06-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the use of microwave irradiation to treat conventional chrome tanning agents, and then use the treated tanning liquor for tanning

Method used

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  • Method for improving absorptivity of chrome tanning agent in tanning process through microwave irradiation pretreatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Dissolve chrome tanning agent with a basicity of 0% in water to prepare Cr 2 o 3 The chrome tanning solution with a concentration of 5g / L; under the condition of stirring, microwave irradiation with a frequency of 915MHz is used to raise the temperature to 30°C, and stir and keep warm at this temperature for 60min; then add the chrome tanning solution treated by microwave irradiation into the Drum, and add sodium chloride to make the concentration of neutral salt in the tanning solution 90g / L; turn the drum until the neutral salt is completely dissolved, put in the pickled bare hide, the weight of the bare hide is 200% of the weight of the tanning solution, and then press The chrome tanning is carried out by the conventional method, and the parameters such as the amount of tanning agent, liquid ratio, temperature, time and pH value during the chrome tanning process are the same as those of conventional chrome tanning.

Embodiment 2

[0015] Dissolve the chrome tanning agent with a basicity of 33% in water to prepare Cr 2 o 3 The chrome tanning solution with a concentration of 20g / L; under the condition of stirring, microwave irradiation with a frequency of 2450MHz is used to raise the temperature to 40°C, and stir and keep warm at this temperature for 150min; then add the chrome tanning solution treated by microwave irradiation into the Drum, and add sodium chloride to make the concentration of neutral salt in the tanning solution 60g / L; turn the drum until the neutral salt is completely dissolved, put in pickled hides, the weight of the bare hide is 100% of the weight of the tanning solution, and then press The chrome tanning is carried out by the conventional method, and the parameters such as the amount of tanning agent, liquid ratio, temperature, time and pH value during the chrome tanning process are the same as those of conventional chrome tanning.

Embodiment 3

[0017] Dissolve the chrome tanning agent with a basicity of 42% in water to prepare Cr 2 o 3 The chrome tanning solution with a concentration of 10g / L; under the condition of stirring, microwave irradiation with a frequency of 2450MHz is used to raise the temperature to 50°C, and stir and keep warm at this temperature for 45min; then add the chrome tanning solution treated by microwave irradiation into the Drum, and add sodium sulfate to make the concentration of neutral salt in the tanning solution 70g / L; turn the drum until the neutral salt is completely dissolved, put in the pickled bare hide, the weight of the bare hide is 150% of the weight of the tanning solution, and then press the conventional Methods Chrome tanning was carried out, and the parameters such as tanning agent dosage, liquid ratio, temperature, time and pH value during the chrome tanning process were the same as those of conventional chrome tanning.

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PUM

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Abstract

The invention provides a method for improving the absorptivity of a chrome tanning agent in the tanning process through microwave irradiation pretreatment. The method is characterized by comprising the following steps: dissolving a chrome tanning agent in water to prepare chrome tanning liquid with certain concentration; raising the temperature to 30 to 50 DEG C by utilizing microwave irradiationunder a stirring condition; stirring and carrying out heat preservation treatment for 30 to 150 minutes at the temperature; then adding the treated chrome tanning liquid into a rotating drum and adding a certain amount of neutral salt; after the drum is rotated until the neutral salt is completely dissolved, a proper amount of pickled bare leather can be put into the drum to be subjected to chrometanning according to a conventional method, the weight of the bare leather is 100-200% of the weight of tanning liquid, and parameters such as tanning agent dosage, liquid ratio, temperature, time and pH value in the chrome tanning process are the same as those of conventional chrome tanning. By adopting the method provided by the invention, the chromium absorption rate in the tanning process canbe remarkably improved, and the chromium content in the wastewater is reduced. Materials used in the method are chemical raw materials commonly used in the tanning industry, the influence of the technical scheme on existing chrome tanning operation is small, and the practicability is high.

Description

technical field [0001] The invention belongs to the technical field of leather tanning and chrome tanning agent modification processing, and in particular relates to a method for pretreating chrome tanning liquid by microwave irradiation to improve the absorption rate of tanning agent in the chrome tanning process. Background technique [0002] When tanning with chrome tanning agent alone, the shrinkage temperature of the finished leather can exceed 100°C, and the chrome tanned leather has excellent softness, plumpness and washing resistance, which is beyond the reach of other tanning agents and tanning methods. In addition, the chrome tanning process is simple to operate, the production efficiency is high, and the product quality is stable, making chrome tanning the most important tanning method in the current leather processing. However, the absorption rate of the tanning agent in the traditional chrome tanning process is only 65-75%, and a large amount of chromium is not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/06B01J19/12
CPCB01J19/0006B01J19/126C14C3/06
Inventor 张金伟
Owner SICHUAN UNIV
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