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A kind of reducing agent for dye and preparation method thereof

A reducing agent and dye technology, applied in the field of printing and dyeing, can solve problems such as unfavorable storage, easy heating, easy decomposition, etc., and achieve the effect of enhancing the ability of waterproof vapor penetration, prolonging storage time, and reducing the possibility of carbonization

Active Publication Date: 2022-04-19
NINGBO MENGHENG LINE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the unstable nature of sodium hydrosulfite, it is easy to decompose when directly exposed to the air, and it is very easy to be damp and easy to generate heat, which is not conducive to preservation.

Method used

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  • A kind of reducing agent for dye and preparation method thereof
  • A kind of reducing agent for dye and preparation method thereof
  • A kind of reducing agent for dye and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for preparing a reducing agent for dyes, comprising the steps of,

[0038] Step 1: each component of nucleosome is taken by weighing, be respectively 10g hydrosulfite, 8g thiourea dioxide and 7g sodium ascorbate;

[0039] Step 2: adding all the substances in step 1 into a dry blender for uniform mixing to obtain a dry blend;

[0040] Step 3: Place the dry mixture in a polyvinyl alcohol film with a thickness of 20um, and then wrap the dry mixture with the polyvinyl alcohol film;

[0041] Step 4: heating the polyvinyl alcohol film and the dry mixture together at a temperature of 120-140° C., so that the polyvinyl alcohol is softened and completely coated on the dry mixture, thereby obtaining a finished reducing agent with a core-shell structure.

[0042] Here, the degree of alcoholysis of polyvinyl alcohol is 65%, and the degree of polymerization is 1700-2600.

Embodiment 2

[0044] A method for preparing a reducing agent for dyes, comprising the steps of,

[0045] Step 1: take each component of nuclear body, be respectively 13g sodium bicarbonate, 16g thiourea dioxide and 10g sodium ascorbate;

[0046] Step 2: adding all the substances in step 1 into a dry blender for uniform mixing to obtain a dry blend;

[0047] Step 3: Place the dry mixture in a polyvinyl alcohol film with a thickness of 20um, and then wrap the dry mixture with the polyvinyl alcohol film;

[0048] Step 4: heating the polyvinyl alcohol film and the dry mixture together at a temperature of 120-140° C., so that the polyvinyl alcohol is softened and completely coated on the dry mixture, thereby obtaining a finished reducing agent with a core-shell structure.

[0049] Here, the degree of alcoholysis of polyvinyl alcohol is 75%, and the degree of polymerization is 1700-2600.

Embodiment 3

[0051] A method for preparing a reducing agent for dyes, comprising the steps of,

[0052] Step 1: take each component of nuclear body, be respectively 16g sodium bicarbonate, 24g thiourea dioxide and 13g sodium ascorbate;

[0053] Step 2: adding all the substances in step 1 into a dry blender for uniform mixing to obtain a dry blend;

[0054] Step 3: Place the dry mixture in a polyvinyl alcohol film with a thickness of 20um, and then wrap the dry mixture with the polyvinyl alcohol film;

[0055] Step 4: heating the polyvinyl alcohol film and the dry mixture together at a temperature of 120-140° C., so that the polyvinyl alcohol is softened and completely coated on the dry mixture, thereby obtaining a finished reducing agent with a core-shell structure.

[0056] Here, the degree of alcoholysis of polyvinyl alcohol is 85%, and the degree of polymerization is 1700-2600.

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Abstract

The invention discloses a reducing agent for dyes, which relates to the field of printing and dyeing, comprising a core body and a shell coated outside the core body, the shell is made of polyvinyl alcohol, and the core body is calculated in parts by mass, comprising: 10-16 parts of hydrosulfite, 8-24 parts of thiourea dioxide and 7-13 parts of sodium ascorbate. By adopting the above-mentioned technical scheme, polyvinyl alcohol is used to wrap the components of the core body, so that on the one hand, when storing, the possibility of direct contact with air between sodium hydrosulfite and thiourea dioxide can be reduced, thereby reducing the amount of hydrosulfite and thiourea dioxide. Possibility of failure due to moisture. On the other hand, when the whole reducing agent is put into the alkaline solution, the polyvinyl alcohol will dissolve into the water, so that the components of the nuclei will be dispersed into the alkaline solution, thus forming a strong alkaline reducing solution. This facilitates the feeding operation of the reducing agent. At the same time, its preparation method is relatively simple and suitable for large-scale production.

Description

technical field [0001] The invention relates to the field of printing and dyeing, in particular to a reducing agent for dyes and a preparation method thereof. Background technique [0002] Vat dyes refer to dyes that are originally insoluble in water. When dyeing, they must be reduced and dissolved in a strong alkaline reducing solution to form leuco-salt sodium salts to dye fibers. After oxidation, they will return to insoluble dye lakes and fix on fibers. , generally washable, light fastness is higher. For example Shihlin blue and so on. It is mainly used for dyeing cotton and polyester-cotton blended fabrics; vinylon can also be colored; in the silk industry, it is used for rayon, rayon-rayon interweaving, and real silk discharge printing. [0003] In the process of printing and dyeing of vat dyes, the reducing agent selected plays a very important role, and often affects the color fastness of the dye. And in the prior art, generally just use sodium hydrosulfite and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06P1/673D06P1/52D06P1/22D06P1/613D06P1/46D06P1/649D06P1/651
CPCD06P1/67375D06P1/5228D06P1/22D06P1/6133D06P1/46D06P1/67383D06P1/6491D06P1/65125
Inventor 陆晓君田宗海石东风乐明军郭亮
Owner NINGBO MENGHENG LINE IND
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