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Preparation method of alkali-resistant yellow disperse dye

A disperse dye, yellow technology, applied in the direction of dyeing, azo dyes, organic dyes, etc., can solve the problems of insufficient alkali resistance, insufficient oxidation resistance and stability, difficult to remove, etc.

Active Publication Date: 2020-08-11
浙江山川科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, common alkali-resistant disperse dyes are usually dyed in the pH7-9 range, and alkali resistance is still insufficient
Chinese patent CN102250485B discloses a yellow disperse dye for acid-alkaline dyeing, which can be dyed in a dyebath of pH=4-14, but the oxidation resistance and stability of the dye is insufficient
[0009] However, the above-mentioned alkali-resistant disperse dyes are prone to color blooms or uneven dyeing during the dyeing process, and it is difficult to remove them by means of stripping and the like.

Method used

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  • Preparation method of alkali-resistant yellow disperse dye
  • Preparation method of alkali-resistant yellow disperse dye
  • Preparation method of alkali-resistant yellow disperse dye

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Add 4.9 g of 2,4-diaminotoluene, 7.4 g of 2,4-dinitrofluorobenzene, 20 g of N,N-diisopropylethylamine and 120 mL of absolute ethanol into a three-necked flask, and heat to reflux for 24 hours. After the reaction, cool to room temperature, filter; wash with distilled water 3 times, and dry to obtain 10.6 g of orange solid (92% yield in this step), namely the compound of formula (II-1).

[0052]

[0053] Add the compound of formula (II-1) and appropriate amount of water into another three-necked flask, and stir at room temperature for 1 h. Add ice to cool down to 0-5°C, add 14.3g of 30wt% hydrochloric acid under heat preservation conditions, and stir well for 2h. At 0-5°C, 12.1 g of a 25 wt % sodium nitrite solution was continuously added dropwise, and after the dropwise addition was completed, the mixture was incubated for 4 hours. Add sulfamic acid to remove excess sodium nitrite, use starch potassium iodide test paper to detect that it does not turn blue in 3-5 sec...

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Abstract

The invention discloses a preparation method of an alkali-resistant yellow disperse dye, which comprises the following steps: reacting 2, 4-diaminotoluene with 2, 4-dinitrofluorobenzene to obtain a compound of formula (II-1); performing diazotization and coupling reaction to obtain a compound shown as a formula (III-1); and reacting with methyl bromide to obtain the compound shown in the formula (I-1). The dye prepared by the preparation method can realize short-process dyeing on polyester fiber fabrics, not only can improve the alkali resistance of alkali-resistant disperse dyes under the condition that the pH value is 10-12, but also can significantly improve the dyeing defect or non-uniform dyeing phenomenon of the polyester fabrics.

Description

technical field [0001] The invention belongs to the technical field of printing and dyeing, and relates to a preparation method of an alkali-resistant yellow disperse dye. Background technique [0002] For a long time, the printing and dyeing industry has been one of the major polluting industries, and the amount of wastewater discharged ranks first among all industries. Studies have shown that for every ton of fabric printed and dyed, about 100-200 tons of wastewater are generated. According to incomplete statistics, the total amount of wastewater discharged by the printing and dyeing industry in my country is about 1 billion tons every year. Printing and dyeing wastewater not only contains a large amount of dyes, dyeing auxiliaries and impurities contained in fibers, but also contains a large amount of acids, alkalis and inorganic salts. These wastewaters have a deep color and high COD and BOD values. As my country's environmental protection legislation and law enforcem...

Claims

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Application Information

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IPC IPC(8): C09B29/01C09B29/12C09B67/22C09B67/38C09B67/40D06P1/18D06P1/19D06P3/54
CPCC09B29/0003C09B29/0018C09B29/12C09B67/0041C09B67/008C09B67/0082D06P1/18D06P1/19D06P3/54
Inventor 韩耀君
Owner 浙江山川科技股份有限公司
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