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A direct, p-nitrotoluene technology, applied in the direction of organic dyes, stilbene-azo dyes, etc., can solve the problem of low dyeing rate
Active Publication Date: 2015-01-28
常州悦朋科技有限公司
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Its advantage is that the price is low, but its dyeing rate is low, so it is
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preparation example Construction
[0016] A kind of preparation method of environment-friendly direct yellow 11 with high dye uptake rate, its preparation comprises the following process:
[0017] 4) Weigh diethylene glycol ethyl ether in a three-necked flask, weigh p-nitrotoluene o-sulfonic acid and add it, after stirring evenly, weigh the alcohol amine, slowly drop into the mixed solution, and stir until p-nitrotoluene o-sulfonic acid Sulfonic acid dissolves completely.
[0018] 5) Raise the temperature of the mixture in step 1). After reaching the temperature, slowly add NaOH solution dropwise to the reaction solution. After keeping it warm for a period of time, add ethylene glycol monomethyl ether solution and stir evenly.
[0019] 6) Lower the temperature of the above 2) solution, after room temperature, use H 2 SO 4 The pH value of the solution was adjusted, filtered with suction, and dried to obtain a solid of Direct Yellow 11.
[0020] 1) Diethylene glycol ether, the molecular structure is CH 3 CH ...
Embodiment 1
[0022] Add 10ml of diethylene glycol ethyl ether to the three-neck flask, weigh 10g of p-nitrotoluene o-sulfonic acid with a content of 80-90%, add it to the water, stir evenly, raise the temperature to 60°C, add about 54ml of 10% NaOH solution , after stirring for 30min, add 10g of triethanolamine, after heat preservation for 8h, add Second Diol monomethyl ether 4ml, stir evenly, use H 2 SO 4 The solution was adjusted to pH 8, filtered with suction and dried.
Embodiment 2
[0024] Add 10ml of diethylene glycol ethyl ether to the three-neck flask, weigh 10g of p-nitrotoluene o-sulfonic acid with a content of 80-90%, add it to the water, stir evenly, raise the temperature to 60°C, add about 54ml of 10% NaOH solution , after stirring for 30min, add 3.4g of diethanolamine, heat preservation reaction for about 8h and finish heating, use H 2 SO 4 The solution was adjusted to pH 8, filtered with suction and dried.
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Abstract
The invention discloses a method for improving direct yellow 11 dye-uptake, and relates to a method for improving dye-uptakes. 4-nitrotoluene-2-sulfonic acid as raw material and a NaOH solution undergo a self condensation reaction to produce direct yellow 11. The method comprises the following steps of weighing diethylene glycol monoethyl ether, putting it into a three-necked flask, weighing 4-nitrotoluene-2-sulfonic acid, putting it into the same three-necked flask, carrying out stirring well, weighing alcohol amine, slowly and dropwisely adding the alcohol amine into the mixed solution, stirring the mixed solution until the 4-nitrotoluene-2-sulfonic acid is completely dissolved, heating the mixed solution to a certain temperature, slowly and dropwisely adding a NaOH solution into the reaction solution, carrying out heat preservation for a period of time, adding an ethylene glycol monomethyl ether solution into the mixed solution, carrying out stirring well, then carrying out cooling, regulating the pH value by a H2SO4 solution, carrying out suction filtrating, and carrying out direct drying to obtain the direct yellow 11 solids. The direct yellow 11 prepared by the method has a high dye-uptake and is environmental friendly.
Description
Technical field [0001] The present invention involves a method of improving the upper dyeing rate, especially a method that involves an increase in direct yellow 11 upper dyeing rate. Background technique [0002] The direct dye is widely used for its simple synthesis process, convenient dyeing, and low price.In 1973, the output of direct dyes in my country reached 12,295 tons, which was the highest level in history.Direct dyes are very important in the printing and dyeing industry, especially knitting and silk industries.Under the current situation of various dyes, the sales of direct dyes are better.Direct yellow 11 dyes have been widely used in industry, printing, textiles and other industries.Its advantage is that the price is low, but its upper dyeing rate is low. Therefore, it is necessary to study the method of improving the direct dyeing rate of direct yellow 11. Invention content [0003] The purpose of the present invention is to provide a method to increase the dyeing...
Claims
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