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Method for preparing oligomer of ethylene group in used for aluminium tanning

A vinyl and oligomer-like technology, which is applied in the field of preparation of vinyl oligomers, can solve problems such as poor light resistance, and achieve the effects of improved alkali resistance stability and good washing resistance

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 obtained leather has a darker base color, and the color is easy to further darken during use, and the light resistance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] Example 1: Firstly, 1 mole of thiosemicarbazide was dissolved in 800 ml of glacial acetic acid with a concentration of 99.5% by mass, and then 1.1 moles of maleic anhydride was dissolved in 400 ml of glacial acetic acid with a concentration of 99.5% by mass. The two solutions were dissolved in 5 Mix at ℃, stir for 40 minutes, stand at 5℃ for 24 hours, filter, dry to obtain N-thioureidomaleamic acid; then dissolve 1 mole of N-thioureidomaleamic acid with 120% water of its own mass Mix with 1 mole of acrylic acid solution with pH 6.0 neutralized by sodium hydroxide solution and 2 moles of hydroxypropyl acrylate as a mixed monomer; then mix 8% of the monomer mass with 99.5% ammonium persulfate and mono Sodium bisulfite with a weight percentage of 4.5% by weight and 99.5% by weight is dissolved in deionized water 10 times its own weight, and then mixed as a mixed initiator; finally, 260% by weight of monomer is added to the reactor with deionized water After stirring and heatin...

Embodiment 2

[0007] Example 2: Firstly, 1 mole of thiosemicarbazide was dissolved in 1200 ml of glacial acetic acid with a mass percentage of 99.5%, and then 1.0 mole of maleic anhydride was dissolved in 500 ml of glacial acetic acid with a mass percentage of 99.5%, and the two solutions were dissolved in 30 Mix at ℃, stir for 30 minutes, stand at 30℃ for 48 hours, filter, dry to obtain N-thioureidomaleamic acid; then dissolve 1 mole of N-thioureidomaleamic acid with 80% of its mass in water Mix with 2 moles of acrylic acid solution with pH 6.0 neutralized by sodium hydroxide solution and 1.6 moles of hydroxypropyl acrylate as mixed monomers; then 7% by mass of monomers and 99.5% by mass of ammonium persulfate and mono Sodium bisulfite with a mass percentage of 4.2% by mass and 99.5% by mass is dissolved in deionized water 10 times its own mass, and then mixed as a mixed initiator; finally, deionized by monomer mass of 264% is added to the reactor After stirring the water and heating to 88°C, ...

Embodiment 3

[0008] Example 3: First, 1 mole of thiosemicarbazide was dissolved in 900 ml of glacial acetic acid with a mass percentage concentration of 99.5%, and then 1.03 moles of maleic anhydride was dissolved in 600 ml of glacial acetic acid with a mass percentage concentration of 99.5%, and the two solutions were dissolved in 26 Mix at ℃, stir for 20 minutes, stand at 26℃ for 29 hours, filter, dry to obtain N-thioureido maleamic acid; then dissolve 1 mole of N-thioureido maleamic acid with 100% water of its own mass Mixed with 3 moles of acrylic acid solution with pH 6.0 neutralized by sodium hydroxide solution and 1 mole of hydroxypropyl acrylate as mixed monomers; then 7.6% by mass of monomers and 99.5% by mass of ammonium persulfate and mono Sodium bisulfite with a mass percentage of 3.5% by mass and 99.5% by mass was dissolved in deionized water 10 times its own mass, and then mixed as a mixed initiator; finally, 270% of the monomer mass was added to the reactor with deionized water ...

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Abstract

A preparation method for vinyl low polymer used in Al tannge takes maleic anhydride and aminothiourea as the raw materials to prepare N-thioureido maleamidic acid first which is copolymerized with acrylic acid and its derivations to get the prepared low polymer with carboxy, hydroxyl and thioureido moleculars.

Description

Technical field [0001] The invention relates to a preparation method of an aluminum tanning auxiliary agent for leather making, in particular to a preparation method of a vinyl oligomer for aluminum tanning. Background technique [0002] Chrome tanning is the most important tanning method in leather production. However, the chrome tanning process will produce a large amount of chrome-containing waste liquid, which will pollute the environment after being discharged. In order to avoid the generation of chromium-containing waste liquid, people began to explore the method of using aluminum complexes to completely replace chromium complexes for tanning as early as the 1980s. However, due to the low shrinkage temperature of pure aluminum tanned leather (only 70-73°C), it is far from reaching the requirement above 90°C, and the aluminum in the leather is easily washed out during dyeing and fatliquoring and detanning occurs. Therefore, it has not been possible to completely replace chro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C14C3/22
Inventor 王鸿儒王新刚
Owner SHAANXI UNIV OF SCI & TECH
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