Regeneration plant tanning agent and preparation method thereof

A vegetable tanning agent and vegetable tanning technology, applied in the field of regenerated vegetable tanning agent and its preparation, can solve the problems of unstable quality of finished leather and inability to completely solve the problem of effective component utilization of vegetable tanning waste liquid, achieve low price, reduce production The effects of pollution in leather production and simple process operation

Inactive Publication Date: 2013-12-18
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the operation process is too extensive, the quality of the finished leather produced by this method is unstable, and it cannot completely solve the problem of the utilization of active ingredients in the vegetable tanning waste liquid and the environmental problems caused by the waste liquid discharge.

Method used

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  • Regeneration plant tanning agent and preparation method thereof
  • Regeneration plant tanning agent and preparation method thereof
  • Regeneration plant tanning agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Sulfonation treatment

[0035] Add 350 parts of Vitex bark extract vegetable tanning waste liquid into the reactor, add 2.8 parts of sodium sulfite and 1.2 parts of sodium bisulfite, then raise the temperature of the reactor to 75°C, stir thoroughly for 3.5 hours, and the sulfonation treatment is completed , the pH of the system at this moment is 5.5;

[0036] (2) Cross-linking treatment

[0037] Reduce the temperature of the reactor containing waste vegetable tanning liquid obtained in step (1) to 35°C, then add 7.5 parts of concentrated sulfuric acid to the reactor to lower the pH of the system to 3.1, add 1.4 parts of formaldehyde, and then adjust the temperature of the reactor to 30°C, stirred and reacted for 0.5 hours, and added 0.10 part of sodium sulfosuccinate to obtain a regenerated vegetable tanning agent.

Embodiment 2

[0039] (1) Sulfonation treatment

[0040] Add 200 parts of eucalyptus extract vegetable tanning waste liquid into the reactor, add 4.1 parts of sodium sulfite and 3.4 parts of sodium bisulfite, then raise the temperature of the reactor to 85°C, stir thoroughly for 9.5 hours, and the sulfonation treatment is completed. Now the pH of the system is 7.2;

[0041] (2) Cross-linking treatment

[0042] Reduce the temperature of the reactor containing waste vegetable tanning liquid obtained in step (1) to 35°C, then add 4.2 parts of concentrated sulfuric acid to the reactor to lower the pH of the system to 4.2, add 4.0 parts of glutaraldehyde, and then turn the reactor The temperature was adjusted to 40° C., stirred and reacted for 3.5 hours, and 0.02 part of alkylphenol ether sodium sulfosuccinate was added to obtain a regenerated vegetable tanning agent.

Embodiment 3

[0044] (1) Sulfonation treatment

[0045] Add 600 parts of larch extract vegetable tanning waste liquid into the reactor, add 3.6 parts of sodium sulfite and 7.8 parts of sodium bisulfite, then raise the temperature of the reactor to 75°C, stir thoroughly for 8.0 hours, and the sulfonation treatment is completed. Now the pH of the system is 6.2;

[0046] (2) Cross-linking treatment

[0047] Reduce the temperature of the reactor containing waste vegetable tanning liquid obtained in step (1) to 25°C, then add 6.2 parts of concentrated sulfuric acid to the reactor to lower the pH of the system to 3.6, add 1.9 parts of modified glutaraldehyde, and then The temperature of the reactor was adjusted to 35° C., stirred and reacted for 0.5 hour, and 0.08 part of fatty alcohol polyoxyethylene ether was added to obtain a regenerated vegetable tanning agent.

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Abstract

The invention discloses a regeneration plant tanning agent. The regeneration plant tanning agent is prepared according to the following steps: enabling macromolecular tannin precipitation in vegetable tanning liquid waste to be properly degraded and sufficiently peptized through sulfonated processing, at the same time, controlling reaction conditions and maintaining the completeness of the structure of small molecule phenolics; then, utilizing cross-linking treatment to enable the small molecule phenolics to be linked sufficiently in a cross mode, increasing the average molecular weight of the small molecule phenolics, and enabling the molecular weight of the tannin to be distributed in a most proper range in the vegetable tanning process; finally, utilizing peptizing agents to adjust the Zeta electric potential and the grain size of the regeneration tanning agent to stable states. The regeneration plant tanning agent can sufficiently tan naked leather sufficiently. Obtained finished leather can be compared with merchandise industrial tannin extracts in heat stability and mechanical performance. The invention relates to a preparation method of the regeneration plant tanning agent. Vegetable tanning liquid waste is used as basic materials, and the influence of vegetable tanning on the environment can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of leather chemical industry, and in particular relates to a regenerated vegetable tanning agent and a preparation method thereof. Background technique [0002] Vegetable tanning is one of the main methods of leather tanning. After the vegetable tanning process, about 20-30% of the tannins cannot be absorbed by the skin collagen, and usually exist in the wastewater in the form of free or precipitated substances, making the COD index of the wastewater as high as 8000mg / L or more. This will not only lead to serious environmental pollution problems, but also a great waste of resources. [0003] In order to solve this problem, the methods researched and developed by tanning workers are as follows: (1) chemical or biodegradation method, which reduces the molecular weight of tannins in waste liquid to achieve the purpose of reducing the biological activity of vegetable tanning wastewater (He Guiping , Shen Lin, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/10
Inventor 陈武勇滕博简晓昀张金伟
Owner SICHUAN UNIV
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