阅读说明：本技术 一种植物靛蓝印花方法 (Plant indigo printing method ) 是由 彭勇刚 汪媛 黎珊 纪俊玲 陶永新 于 2019-10-14 设计创作，主要内容包括：本发明提供了一种植物靛蓝印花方法,该方法采用阿拉伯树胶和瓜尔豆胶混合糊料为增稠剂,采用亚铁离子与N-(2-羟基乙基)乙烯二胺三乙酸三钠络合物为还原剂,通过直接印花方式,实现植物靛蓝印花。亚铁盐络合还原体系具有很强的还原势,可将植物靛蓝还原,避免了保险粉的使用；同时,混合糊料中含有的还原性糖也有助于靛蓝的还原。此外,在印花过程中,采用透明质酸钠作为保湿剂,避免了尿素的使用。(The invention provides a plant indigo printing method, which adopts a mixed paste of gum arabic and guar gum as a thickening agent, adopts a ferrous ion and N- (2-hydroxyethyl) ethylene diamine triacetic acid trisodium complex as a reducing agent, and realizes plant indigo printing by a direct printing mode. The ferrite complex reduction system has strong reduction potential, can reduce the plant indigo, and avoids the use of sodium hydrosulfite; at the same time, the reducing sugar contained in the mixed paste also contributes to the reduction of indigo. In addition, during the printing process, sodium hyaluronate is used as a humectant, so that the use of urea is avoided.)

1. A plant indigo printing method is characterized in that: the preparation method comprises the following steps of,

adopting gum arabic and guar gum mixed paste as a thickening agent, adopting a ferrous ion and N- (2-hydroxyethyl) ethylene diamine triacetic acid trisodium complex as a reducing agent, and realizing the printing of the plant indigo by a direct printing mode.

2. A plant indigo printing process according to claim 1, characterised in that: the method comprises the specific steps of carrying out the following steps,

(1) mixing gum arabic raw paste with the mass fraction of 25% and guar gum raw paste with the mass fraction of 3.0% according to the mass ratio of 1:5-1:10, and stirring at high speed for 30-45min to obtain mixed paste for later use;

(2) dissolving N- (2-hydroxyethyl) ethylene diamine triacetic acid trisodium into deionized water to prepare an N- (2-hydroxyethyl) ethylene diamine triacetic acid trisodium solution with the amount concentration of 0.5-1.0 mol/L, and adding ferrous sulfate under continuous stirring until the ferrous sulfate is completely dissolved to prepare a ferrous complex system solution;

(3) mixing plant indigo with a small amount of deionized water uniformly for later use; dissolving sodium hyaluronate with a small amount of water to prepare sodium hyaluronate solution; dissolving sodium hydroxide in a proper amount of deionized water to prepare a sodium hydroxide solution; adding the printing raw paste into an enamel beaker, respectively adding the indigo dye solution, the sodium hyaluronate solution and the ferrous complex system solution obtained in the step (2) under stirring, finally adding the sodium hydroxide solution, and uniformly stirring to obtain printing paste;

wherein, the printing paste comprises the following components in percentage by weight: 40-58% of mixed paste, 1.0-8.0% of plant indigo, 20-30% of ferrous complex system solution, 0.5-1.0% of sodium hyaluronate, 1.0-3.0% of sodium hydroxide and 0-37.5% of water;

(4) and (4) printing, prebaking, reducing steaming, oxidizing, washing, soaping and drying the cellulose fiber fabric by adopting the printing paste obtained in the step (3) according to a conventional printing process.

3. A plant indigo printing process according to claim 2, characterised in that: the molar ratio of the ferrous sulfate to the trisodium N- (2-hydroxyethyl) ethylenediamine triacetate in the step (2) is 4:1-8: 1.

4. A plant indigo printing process according to claim 2, characterised in that: the pre-drying temperature in the step (4) is 60-80 ℃, and the pre-drying time is 3-5 min; the reduction steaming temperature is 102-105 ℃, and the steaming time is 15-30 min; and (3) oxidation conditions: h₂O₂2g/L, and the oxidation time is 2-3 min; soaping conditions are as follows: 90-95 ℃ and Na₂CO₃2g/L, 2g/L of soap flakes, a bath ratio of 1:30, and a soaping time of 10-15 min.

Technical Field

The invention belongs to the technical field of spinning, and particularly relates to a plant indigo printing method.

Background

China is one of the earliest countries using indigo dye, and has a history of more than three thousand years. The plant indigo is bright in color, wide in source and convenient to use, and is deeply loved by ancient workers in China. The dyed textile has elegant color and plump hand feeling, and the traditional dyeing method using the plant indigo in rural areas such as Jiangsu, Zhejiang, Yunnan, Sichuan, Guizhou, Guangxi and the like is still adopted.

Because indigo is insoluble in water and needs to be reduced into soluble leuco salt by caustic soda and sodium hydrosulfite before dyeing, the indigo can be dyed on fibers, so that the indigo is commonly used for dyeing textiles or white discharge printing after dyeing, and reports of direct printing of the indigo are rarely adopted, which may be related to difficult reduction of the indigo.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention provides a plant indigo printing method, which adopts a mixed paste of gum arabic and guar gum as a thickening agent, adopts a complex of ferrous ions and N- (2-hydroxyethyl) ethylene diamine triacetic acid trisodium as a reducing agent, and realizes plant indigo printing by a direct printing mode.

The invention provides a plant indigo printing method, which comprises the following steps:

(1) mixing gum arabic raw paste with the mass fraction of 25% and guar gum raw paste with the mass fraction of 3.0% according to the mass ratio of 1:5-1:10, and stirring at high speed for 30-45min to obtain mixed paste for later use;

(2) dissolving N- (2-hydroxyethyl) ethylene diamine triacetic acid trisodium into deionized water to prepare an N- (2-hydroxyethyl) ethylene diamine triacetic acid trisodium solution with the amount concentration of 0.5-1.0 mol/L, and adding ferrous sulfate under continuous stirring until the ferrous sulfate is completely dissolved to prepare a ferrous complex system solution;

(3) mixing plant indigo with a small amount of deionized water uniformly for later use; dissolving sodium hyaluronate with a small amount of water to prepare sodium hyaluronate solution; dissolving sodium hydroxide in a proper amount of deionized water to prepare a sodium hydroxide solution; adding the printing raw paste into an enamel beaker, respectively adding the indigo dye solution, the sodium hyaluronate solution and the ferrous complex system solution obtained in the step (2) under stirring, finally adding the sodium hydroxide solution, and uniformly stirring to obtain printing paste;

wherein, the printing paste comprises the following components in percentage by weight: 40-58% of mixed paste, 1.0-8.0% of plant indigo, 20-30% of ferrous complex system solution, 0.5-1.0% of sodium hyaluronate, 1.0-3.0% of sodium hydroxide and 0-37.5% of water;

(4) and (4) printing, prebaking, reducing steaming, oxidizing, washing, soaping and drying the cellulose fiber fabric by adopting the printing paste obtained in the step (3) according to a conventional printing process.

Wherein the molar ratio of the ferrous sulfate to the trisodium N- (2-hydroxyethyl) ethylenediamine triacetic acid in the step (2) is 4:1-8: 1.

Wherein the pre-drying temperature in the step (4) is 60-80 ℃, and the pre-drying time is 3-5 min; the reduction steaming temperature is 102-105 ℃, and the steaming time is 15-30 min; and (3) oxidation conditions: h₂O₂2g/L, and the oxidation time is 2-3 min; soaping conditions are as follows: 90-95 ℃ and Na₂CO₃2g/L, 2g/L of soap flakes, a bath ratio of 1:30, and a soaping time of 10-15 min.

The invention has the beneficial effects that:

(1) the plant indigo is reduced by adopting a ferrite and N- (2-hydroxyethyl) ethylene diamine triacetic acid trisodium complex reduction system, so that the use of sodium hydrosulfite is avoided.

(2) The gum arabic and guar gum mixed paste is used as a thickening agent, and reducing polysaccharide contained in the mixed paste is beneficial to reduction of plant indigo.

(3) And sodium hyaluronate is adopted to replace urea, so that the influence of urea on the environment is reduced.

Detailed Description

The present invention will be described in further detail with reference to specific examples. It will be understood that these examples are intended to illustrate the invention and are not intended to limit the scope of the invention in any way.