Preparation method of polyethylene polyamine cross-linked structure silicon-containing condensed tannin extract

A polyvinylpolyamine, cross-linked structure technology, applied in the chemical modification of natural resins, animal husbandry, chemical treatment of small raw hides/large hides/leather hides/furs, etc. To solve the problem of high content, to achieve the effect of improving the softness of the finished leather, solving the high content of small molecules of tannin extract and improving the fullness

Active Publication Date: 2019-03-29
XINGYE LEATHER TECH CO LTD
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  • Description
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Problems solved by technology

[0004] Therefore, in view of the above-mentioned problems, the present invention proposes a method for preparing polyvinyl polyamine crosslinked silicon-containing condensed tannin-like extracts. Through the preparation method of the present invention, organosilicon groups are introduced into condensed tannin-like extracts. The introduction of the group improves the water solubility of the tannin extract, thereby reducing the amount of inorganic salt required in the sulfitation treatment process, and solving the problem of too much water-insoluble matter in the existing solution of sulfitation-modified tannin extract; Moreover, the tannin extract prepared by modifying the preparation method of the present invention has a polyethylene polyamine cross-linked structure, which solves the problem that the existing sulfited modified tannin extract has too high a small molecule content in the tannin extract; using the present invention The polyethylene polyamine cross-linked structure containing silicon-containing condensed tannin extract prepared by the preparation method is used for tanning, and the obtained leather has excellent softness and fullness

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Experimental program
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Effect test

Embodiment 1

[0025] A kind of preparation method of polyethylene polyamine cross-linked structure silicon-containing condensed tannin-like extract, comprises following steps successively:

[0026] (1), select condensed tannin extract: the condensed tannin extract is wattle extract;

[0027] (2) Alkaline treatment of tannin extracts: adding condensed tannin extracts to an alkaline solution (sodium hydroxide solution with a mass fraction of 5%), the concentration of the condensed tannin extracts in the alkaline solution is 6g / L, at 20°C Soak for 18 hours, filter out the filter residue after fully reacting, take the filtrate and add alkali solution, stir at 60°C for 18 hours, filter out the filter residue, vacuum dry the filtrate (vacuum drying temperature is 60°C, drying time is 36h) and grind to obtain alkali treatment Condensed tannins;

[0028] (3), tannin extract modification: add the condensed tannin extract treated with tannin base, epichlorohydrin, and catalyst (sodium persulfate) in...

Embodiment 2

[0031] A kind of preparation method of polyethylene polyamine cross-linked structure silicon-containing condensed tannin-like extract, comprises following steps successively:

[0032] (1) Select condensed tannin extract: the condensed tannin extract is wattle extract.

[0033](2) Alkaline treatment of tannin extracts: adding condensed tannin extracts to alkali solution (sodium hydroxide solution with a mass fraction of 5%), the concentration of condensed tannin extracts in the alkaline solution is 10g / L, 40°C Soak for 6 hours, filter out the filter residue after fully reacting, take the filtrate and add alkali solution, stir at 80°C for 6 hours, filter out the filter residue, vacuum dry the filtrate (vacuum drying temperature is 100°C, drying time is 12h) and grind to obtain alkali treatment Condensed extracts.

[0034] (3), tannin extract modification: add the condensed tannin extract treated with tannin base, epichlorohydrin, and catalyst (sodium persulfate) into the solven...

Embodiment 3

[0037] A kind of preparation method of polyethylene polyamine cross-linked structure silicon-containing condensed tannin-like extract, comprises following steps successively:

[0038] (1) Select condensed tannin extract: the condensed tannin extract is wattle extract.

[0039] (2) Alkaline treatment of tannin extracts: adding condensed tannin extracts to alkali solution (sodium hydroxide solution with a mass fraction of 5%), the concentration of condensed tannin extracts in the alkali solution is 10g / L, soaking for 36h , after fully reacting, filter off the filter residue, take the filtrate and add alkali solution, stir at 40°C for 36h, filter off the filter residue, vacuum dry the filtrate (vacuum drying temperature is 30°C, drying time is 72h) and grind to obtain the alkali-treated condensation product Tannin extract.

[0040] (3), tannin extract modification: add the condensed tannin extract treated with tannin base, epichlorohydrin, and catalyst (sodium persulfate) into t...

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Abstract

Relating to the technical field of tanning chemistry and engineering, the invention provides a preparation method of a polyethylene polyamine cross-linked structure silicon-containing condensed tanninextract. According to the preparation method, an organosilicon group is introduced into condensed tannin extract to enhance the water solubility of the tannin extract, thus reducing the amount of inorganic salts needed in a sulfitation treatment process, and solving the problem of excessive insoluble substances in a solution in existing sulfitation modified tannin extract. Moreover, the tannin extract prepared by the preparation method provided by the invention has a polyethylene polyamine cross-linked structure, and solves the problem of too high tannin extract small molecule content in existing sulfitation modified tannin extract. The polyethylene polyamine cross-linked structure silicon-containing condensed tannin extract prepared by the preparation method provided by the invention canbe used for tanning, and the obtained leather has excellent softness and fullness.

Description

technical field [0001] The invention relates to the technical field of tanning chemistry and engineering, in particular to a method for preparing tannin-containing condensed tannins with polyethylene polyamine crosslinked structure. Background technique [0002] Tannin extract is a class of substances whose main components are plant polyphenols extracted from plants. Plant polyphenols include plant tannins, tannin precursor compounds, and tannin polymers. They are natural macromolecular compounds that are widely present in plants and have polyphenolic hydroxyl structures. Their content is second only to cellulose and hemicellulose. and lignin. At present, the research on plant polyphenols covers a wide range of fields including tanning, oil extraction, daily chemicals, medicine, food, agriculture, and environmental protection. Vegetable tanned leather is still the basic tanning method for producing heavy leather because of its good plumpness and formability, firm body, wea...

Claims

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Application Information

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IPC IPC(8): C09F1/04C14C3/12
CPCC09F1/04C14C3/12
Inventor 孙辉永姚庆达贾喜庆温会涛梁永贤唐渊
Owner XINGYE LEATHER TECH CO LTD
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