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
CN103451328AInactive Publication Date: 2013-12-18SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SICHUAN UNIV
Publication Date
2013-12-18
Estimated Expiration
Not applicable · inactive patent

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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.
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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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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