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Method for preparing amphiprotic tanning agents in aryl-sulfone type

An amphoteric tanning agent, aryl sulfone-type technology, applied in the field of preparation of aryl sulfone-type amphoteric tanning agents, can solve the problems of reducing the coloring rate of anionic dyes in chrome tanned leather, achieve good leveling and color fixation, reduce pores, fine grained effect

Inactive Publication Date: 2005-01-12
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing aromatic syntans are all anionic, and most of them will reduce the coloring rate of anionic dyes on chrome-tanned leather to varying degrees while playing the above-mentioned role, resulting in the so-called "bleaching effect".

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: First melt 1 mole of phenol and add 1 mole of concentrated sulfuric acid dropwise at 90°C to obtain phenolsulfonic acid after heat preservation for 4 hours; then mix 1 mole of 4,4'-dihydroxydiphenyl sulfone with 1 mole of phenol After the sulfonic acid is stirred and dissolved at 45°C, slowly add 1 mole of formaldehyde dropwise, stir well and gradually heat to 70°C for 1 hour to obtain the formaldehyde condensate of 4,4'-dihydroxydiphenylsulfone and phenolsulfonic acid; Condensate 1 mole of diethanolamine and 1 mole of formaldehyde at 60°C for 20 hours, then distill and dehydrate under reduced pressure at 60°C to obtain 3-hydroxyethyl oxazolidine; finally, 1 mole of 4,4'-dihydroxydiphenylsulfone and The formaldehyde condensate of phenolsulfonic acid was adjusted to pH 7 with NaOH, heated to 50°C, and 1.5 moles of 3-hydroxyethyl oxazolidine was added dropwise with stirring, and the condensation reaction was carried out for 90 minutes to obtain an amphoteric tan...

Embodiment 2

[0007] Example 2: First melt 1 mole of phenol and add 1 mole of concentrated sulfuric acid dropwise at 95°C to obtain phenolsulfonic acid after heat preservation for 3 hours; then mix 1 mole of 4,4'-dihydroxydiphenyl sulfone with 5 moles of phenol After the sulfonic acid is stirred and dissolved at 40°C, slowly add 3 moles of formaldehyde dropwise, stir well and gradually heat to 80°C for 5 hours to obtain the formaldehyde condensate of 4,4'-dihydroxydiphenylsulfone and phenolsulfonic acid; Condensate 1 mole of diethanolamine and 1 mole of formaldehyde at 30°C for 16 hours, then distill and dehydrate under reduced pressure at 100°C to obtain 3-hydroxyethyl oxazolidine; finally, 1 mole of 4,4'-dihydroxydiphenylsulfone and The formaldehyde condensate of phenolsulfonic acid was adjusted to pH 8 with NaOH, heated to 100°C, and 3 moles of 3-hydroxyethyl oxazolidine was added dropwise with stirring, and the condensation reaction was carried out for 60 minutes to obtain an amphoteric ...

Embodiment 3

[0008] Example 3: First melt 1 mole of phenol and add 1 mole of concentrated sulfuric acid dropwise at 100°C to obtain phenolsulfonic acid after 3.6 hours of heat preservation reaction; then mix 1 mole of 4,4'-dihydroxydiphenyl sulfone with 3 moles of phenol After the sulfonic acid is stirred and dissolved at 44°C, slowly add 2.5 moles of formaldehyde dropwise, stir well and then gradually heat to 100°C to react for 3 hours to obtain the formaldehyde condensate of 4,4'-dihydroxydiphenylsulfone and phenolsulfonic acid; Condensate 1 mole of diethanolamine and 1 mole of formaldehyde at 45°C for 12 hours, then distill and dehydrate under reduced pressure at 80°C to obtain 3-hydroxyethyl oxazolidine; finally, 1 mole of 4,4'-dihydroxydiphenylsulfone and The formaldehyde condensate of phenolsulfonic acid was adjusted to pH 7.5 with NaOH, heated to 80°C, and 1 mole of 3-hydroxyethyl oxazolidine was added dropwise with stirring, and the amphoteric tanning agent was obtained through cond...

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Abstract

A preparation method for bisexual tanning agent takes 4,4' dihydroxy sulfobenzide, phenol sulfuric acid and methanol as the raw material to prepare a methanol condensate, takes diethanolamine and methanol as the raw material to prepare 3-ethoxyl oxazolidine, then to condensate the methanol condensate and 3-ethoxyl oxazolidine to prepare a bisexual tanning agent.

Description

technical field [0001] The invention relates to a method for preparing a tanning agent for leather, in particular to a method for preparing an aryl sulfone type amphoteric tanning agent. Background technique [0002] In tanning production, in order to make chrome tanned leather have good mechanical finishing properties such as resistance to dry falling, shovel resistance, ironing resistance, and easy polishing, and to make crust leather have good light resistance and clear grain surface, it is often necessary to use Aromatic syntans for retanning chrome-tanned leather. However, the existing aromatic syntans are all anionic, and most of them will reduce the coloring rate of anionic dyes on chrome-tanned leather to varying degrees while playing the above-mentioned effects, resulting in so-called "bleaching effect". The method adopted to solve this problem at home and abroad is to remedy by adding a large amount of color fixing agent when dyeing. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): C14C3/08
Inventor 王鸿儒程巧兰
Owner SHAANXI UNIV OF SCI & TECH
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