Decolorizer and its preparation method
A decolorizing agent and catalyst technology, which is applied in the field of dyes, can solve the problems of poor decolorization effect of wool protein extract, and achieve good decolorization effect
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[0029] A first aspect of the present invention provides a preparation method of a decolorizing agent, and the preparation method of the decolorizing agent mainly includes:
[0030] Esterify the mixture mixed with wool keratin, N,N-dimethylethanolamine, catalyst and toluene at 80°C-100°C, and adjust the pH to 5-6;
[0031] Wherein, the catalyst is one or more of propionic acid, concentrated sulfuric acid and solid heteropolyacid.
[0032] In the prior art, waste wool fibers are used as raw materials to extract keratin in wool. The inventors found that wool keratin has a poor decolorization effect on anionic dyes because wool keratin has a small adsorption capacity for acidic, direct, reactive and other anionic dyes.
[0033] In this embodiment, the carboxyl group of wool keratin is esterified with N,N-dimethylethanolamine, and amine group is introduced into wool keratin molecule, and the number of cations in wool keratin is increased after amination modification, The adsorpti...
Embodiment 1
[0068] The present embodiment provides a kind of decolorizing agent, and this decolorizing agent is mainly obtained through the following steps:
[0069] Preparation of sheep keratin: mix 100g of washed wool, 250g of 35wt% sodium hydroxide aqueous solution, and 250g of 35wt% hydrogen peroxide, shake in a water bath at 80°C for 60min to hydrolyze, and then filter the hydrolyzed solution to remove undissolved wool residues, A keratin solution is obtained.
[0070] Preparation of decolorizing agent: take 300g of the above-mentioned wool keratin and put it into a four-necked flask with a stirring device, a water separator and a condenser, heat it to 40°C and add 100g of N,N-dimethylethanolamine, 0.50g of propionic acid and 50g of toluene , poured reflux water, heated up to 80 ℃, and reacted under reflux for 4 h. After the reaction, the toluene was distilled off under reduced pressure. The pH value of the solution was adjusted to 5 with 45wt% KOH to obtain a decolorizing agent.
Embodiment 2
[0072] The present embodiment provides a kind of decolorizing agent, and this decolorizing agent is mainly obtained through the following steps:
[0073] Preparation of sheep keratin: mix 100g of washed wool, 500g of 45wt% sodium hydroxide aqueous solution, and 500g of 25wt% hydrogen peroxide, shake in a water bath at 100°C for 60min to hydrolyze, and then filter the hydrolyzed solution to remove undissolved wool residues, A keratin solution is obtained.
[0074] Preparation of decolorizing agent: take 300g of the above-mentioned wool keratin and put it into a four-necked flask with a stirring device, a water separator and a condenser, add 500g of N,N-dimethylethanolamine, 20g of concentrated sulfuric acid and 100g of N,N-dimethylethanolamine after being heated to 40°C Toluene was introduced into refluxing water, heated to 90° C., and reacted under reflux for 4 hours. After the reaction, the toluene was distilled off under reduced pressure. The pH value of the solution was ad...
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Abstract
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