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A kind of preparation method of aluminum-containing tannin

A technology of tannin and aluminum salt, applied in the field of tanning, can solve the problems of unsatisfactory light resistance and low solid content of the product, achieve high development value and application prospects, good filling performance, and improve the effect of poor parts

Inactive Publication Date: 2014-10-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The Czech patent (publication number CS215386) once reported an auxiliary white syntan, which uses phenol and concentrated sulfuric acid for sulfomethylation, adjusts pH with dilute sulfuric acid for urine formaldehyde, and uses aluminum salt as a whitening component A kind of synthetic tanning agent made from tanning agent, but the light fastness is not ideal, and the solid content of the product is low

Method used

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  • A kind of preparation method of aluminum-containing tannin
  • A kind of preparation method of aluminum-containing tannin

Examples

Experimental program
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Effect test

Embodiment 1

[0016] The first step: 5.3 parts of Na by mass parts 2 CO 3 Mix with 99.9 parts of aluminum sulfate octadecahydrate, then control the temperature at 55 ° C for 2 hours, then add 11.8 parts of succinic acid (masked ligand) and react for 1 hour to obtain masked modified aluminum with a basicity of 11%. Salt, Al in aluminum salt 2 o 3 The content is 9.3%;

[0017] The second step: 32.3 parts of synthetic tannin MND5901 containing bisphenol S structure (the main structure is the condensate of aromatic sulfone bridge compound and naphtholsulfonic acid condensation) is mixed with 54.8 parts of aluminum salt according to the number of parts, and then the temperature is controlled at React at 60°C for 1 h, add sulfuric acid after the reaction to adjust the pH to 3, and obtain the target product. The target product can be used for direct tanning and deliming naked goatskin, and the consumption of product (in Al 2 o 3 Calculated) is 3% of the mass of bare leather. After aging the ...

Embodiment 2

[0019] The first step: 5.3 parts of Na by mass parts 2 CO 3 Mix it with 66.6 parts of aluminum sulfate octadecahydrate, then control the temperature and react at 60°C for 1.5h, then add 13.2 parts of glutaric acid (masked ligand) and react for 1h to obtain the Aluminum salt, Al in aluminum salt 2 o 3 The content is 8.8%;

[0020] The second step: mix 32.3 parts of synthetic tannin MND5901 containing bisphenol S structure (the main structure is the condensate of aromatic sulfone bridge compound and naphthol sulfonic acid condensation) with 58 parts of aluminum salt in parts by mass, and then control the temperature at React at 50°C for 1.5h, add hydrochloric acid after the reaction to adjust the pH to 3, and obtain the target product. The target product can be used for direct tanning and deliming naked goatskin, and the consumption of product (in Al 2 o 3 Calculated) is 3% of bare leather quality, and the leather after tanning is aged for one day, and its shrinkage temper...

Embodiment 3

[0022] The first step: 5.3 parts of Na by mass parts 2 CO 3 Mix with 66.6 parts of aluminum sulfate octadecahydrate, then control the temperature and react at 65°C for 1 hour, then add 14.6 parts of adipic acid (masked ligand) and react for 1 hour to obtain masked modified aluminum with a basicity of 33%. Salt, Al in aluminum salt 2 o 3 The content is 7.8%;

[0023] The second step: 32.3 parts of synthetic tannin MND5901 containing bisphenol S structure (the main structure is the condensate of aromatic sulfone bridge compound and naphtholsulfonic acid condensation) is mixed with 66.2 parts of aluminum salt according to the number of parts, and then the temperature is controlled at React at 55°C for 1.2h, add formic acid after the reaction to adjust the pH to 3, and obtain the target product. The target product can be used for direct tanning and deliming naked goatskin, and the consumption of product (in Al 2 o 3 Calculated) is 3% of bare leather quality, and the leather ...

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Abstract

The invention discloses a method for preparing aluminum-containing tannins. Complexing is carried out on syntannin containing a bisphenol structure and aluminum salts with different basicities, which are modified by masking, to prepare a series of aluminum-containing tannins, the products are brownish black water-soluble liquids, the solid content is 50 percent by weight, and the aluminum-containing tannins contain a large number of hydroxyls, and also contain highly electrophilic sulfone bridge groups. Compared with the conventional chrominum-containing tannin, the aluminum-containing tannin has the advantages that the stability is greatly improved, harms caused by the chromium salt to the human body and the environment are avoided, and the pollution level is greatly reduced; at the same time a finished leather has a light color and the aluminum-containing tannin is suitable for retanning various crust leathers; the filling performance is good, and position difference can be obviously reduced to enable grain sides to be fine; and the crust leathers have certain light resistance and good sunlight fastness, so that the aluminum-containing tannin has a higher development value and good application prospects.

Description

technical field [0001] The invention belongs to the technical field of leather making, and in particular relates to a preparation method of aluminum-containing tannin. Background technique [0002] Today, as environmental protection is increasingly valued, clean production has become the key to the sustainable development of the leather industry, and the development of new chrome-free tanning agents and tanning methods has become one of the current research hotspots. Synthetic tannins, also known as synthetic tanning agents, are made from simple organic compounds through chemical synthesis. It has tanning properties and can improve the performance of other tanning agents. In terms of chrome tanning and other mineral salt tanning, using synthetic tannins as pre-tanning, combined tanning or retanning can make the grain surface of the finished leather compact and fine, with full body and good hand feeling. The traditional chromium-containing tannins will pollute the environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/08
Inventor 强西怀黄剑张辉王加里
Owner SHAANXI UNIV OF SCI & TECH
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