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Method for enhancing alkali resistance and oxidation resistance of benzothiazole disperse dyes

A technology of benzothiazoles and disperse dyes, applied in chemical instruments and methods, dyeing methods, azo dyes, etc., can solve the problems that the relationship between dye molecular structure and alkali resistance and oxidation resistance has not yet formed a system

Active Publication Date: 2020-11-24
QINGDAO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few studies on the oxidation resistance of disperse dyes, and the relationship between the molecular structure of dyes and alkali resistance and oxidation resistance has not yet formed a system

Method used

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  • Method for enhancing alkali resistance and oxidation resistance of benzothiazole disperse dyes
  • Method for enhancing alkali resistance and oxidation resistance of benzothiazole disperse dyes
  • Method for enhancing alkali resistance and oxidation resistance of benzothiazole disperse dyes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0123] A kind of benzothiazole disperse dye shown in the following structural formula,

[0124]

[0125] Its synthetic route is:

[0126]

[0127] Its preparation method comprises the following steps:

[0128] (1) Diazo reaction: Take 2-amino-5,6-dichlorobenzothiazole (0.04mol) and join in a single-necked flask, add 20.00ml of water and 15.6g of 98% sulfuric acid solution, cool to 0°C, and Add an appropriate amount (12.7g) of nitrosylsulfuric acid under stirring (300-500rpm). After stirring evenly, it turns blue with starch-potassium iodide test paper to ensure that the nitrosylsulfuric acid is excessive. Continue to react for 3 hours. After the reaction is completed, add 3.88g of amino Sulphonic acid eliminates excess nitrosyl sulfuric acid, and continues to stir at 0°C for 15 minutes to obtain diazonium solution;

[0129] (2) Coupling reaction: add 60mL water, 2mL H 2 SO 4 and the coupling component (N-ethyl-N-p-tolylaniline (0.1mol)), cooled to 8°C to obtain the cou...

Embodiment 2

[0134] A kind of benzothiazole disperse dye shown in the following structural formula,

[0135]

[0136] Its synthetic route is:

[0137]

[0138] Its preparation method comprises the following steps:

[0139] (1) Diazonium reaction: adjust the "2-amino-5,6-dichlorobenzothiazole" in step (1) of Example 1 to "2-amino-6-chlorobenzothiazole", and other examples Step (1) of 1 is consistent;

[0140] (2) Coupling reaction: consistent with step (2) of Example 1;

[0141] (3) Dissolve the filter cake obtained in step (2) in 95% ethanol solution (the ethanol solution can dissolve the filter cake), reflux at 70° C. for 2 hours, recrystallize after cooling, and obtain benzo Thiazole disperse dyes.

[0142] The obtained benzothiazole disperse dyes are characterized by structure, and the result of H-NMR spectrum ( figure 2 )for:

[0143] 1 H NMR (400MHz, CDCl 3 )δ8.11(s,1H,Ar-H,1),7.96-7.93(dd,2H,Ar-H,3,3'),7.89(s,1H,Ar-H,2),7.26(solvent peak), 7.17-7.08(dd,4H,Ar-H,8,9,10,...

Embodiment 3

[0145] A kind of benzothiazole disperse dye shown in the following structural formula,

[0146]

[0147] Its synthetic route is:

[0148]

[0149] Its preparation method comprises the following steps:

[0150] (1) Diazo reaction: adjust "2-amino-5,6-dichlorobenzothiazole" in step (1) of Example 1 to "2-amino-6-nitrobenzothiazole", and implement Step (1) of Example 1 remains the same;

[0151] (2) Coupling reaction: consistent with step (2) of Example 1;

[0152] (3) Dissolve the filter cake obtained in step (2) in 95% ethanol solution (the ethanol solution can dissolve the filter cake), reflux at 70° C. for 2 hours, recrystallize after cooling, and obtain benzo Thiazole disperse dyes.

[0153] The obtained benzothiazole disperse dyes are characterized by structure, and the result of H-NMR spectrum ( image 3 )for:

[0154] 1 H NMR (500MHz, CDCl 3 )δ8.08-7.99(d,1H,Ar-H,1),7.96-7.85(d,1H,Ar-H,2)7.85-7.49(dd,1H,Ar-H,3),7.26(solvent peak), 7.17-7.07(dd,4H,Ar-H,10,11...

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Abstract

The invention discloses a method for enhancing alkali resistance and oxidation resistance of benzothiazole disperse dyes, and belongs to the field of disperse dyes. According to the method, four diazocomponents and eight coupling components are adopted to design and synthesize 28-branch thiazole heterocyclic azo disperse dyes, so that the alkali resistance and the oxidation resistance of the disperse dyes are enhanced. The synthesized disperse dyes are subjected to structure confirmation, and the alkali resistance, the oxidation resistance and other dyeing properties of the disperse dyes aretested. According to the method for enhancing the alkali resistance and the oxidation resistance of the benzothiazole disperse dyes, the relationship between the dye structure and the alkali resistance and the oxidation resistance is clear, the disperse dyes with excellent alkali resistance and oxidation resistance are obtained, and the dyeing property is stable under the dyeing condition of 10g / Lsodium hydroxide or 5g / L hydrogen peroxide. The dyes can be applied to bleaching and dyeing one bath of polyester cotton and decrement dyeing one bath of polyester, short-process dyeing and finishingprocessing is achieved, and huge ecological benefits and economic benefits are generated.

Description

technical field [0001] The invention relates to a method for enhancing the alkali resistance and oxidation resistance of benzothiazole disperse dyes, belonging to the field of disperse dyes. Background technique [0002] Polyester is the largest and most widely used fiber variety among many synthetic fibers. The unique linear macromolecular structure of polyester endows its fabric with good strength, elasticity, abrasion resistance, heat resistance and practicality. Polyester has tight fiber structure, small molecular gap, high crystallinity, and less hydrophilic groups in the molecule, so disperse dyes with relatively small molecular weights are often used for dyeing. In order to achieve a good dyeing effect, the fiber is usually heated during dyeing. Since polyester is a thermoplastic fiber, when the heating temperature is higher than the glass transition temperature (Tg) of polyester, the crystallization area inside the fiber is reduced, and the movement of the macromole...

Claims

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Application Information

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IPC IPC(8): C09B29/045C09B29/09D06P1/16D06P3/82
CPCC09B29/0088C09B29/08C09B29/0844D06P3/8233D06P1/18D06P3/54Y02P70/62
Inventor 许长海于家学王小艳何亮邱明涛赵新婷杜金梅唐敬淋
Owner QINGDAO UNIV
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