阅读说明：本技术 一种基于稀土配位具有抗紫外性能的天然染料染色方法 (Rare earth coordination-based natural dye dyeing method with ultraviolet resistance ) 是由 陈杨轶 齐欢 张宏杰 张初阳 邱夷平 于 2019-09-29 设计创作，主要内容包括：本发明提供了一种基于稀土配位具有抗紫外性能的天然染料染色方法。先对纺织品进行前处理,制备出稀土配位天然染料,然后对织物进行染色获得天然染料染色织物。本发明提出的稀土配位天然染料染色方法工艺流程短、节能环保,能够显著增强纺织品的抗紫外性能,并具有良好的染色牢度。在抗紫外纺织品领域具有广阔的应用前景。(The invention provides a rare earth coordination-based natural dye dyeing method with ultraviolet resistance. Firstly, pretreating the textile to prepare the rare earth coordination natural dye, and then dyeing the textile to obtain the natural dye dyed textile. The rare earth coordination natural dye dyeing method provided by the invention has the advantages of short process flow, energy conservation and environmental protection, can obviously enhance the ultraviolet resistance of textiles, and has good dyeing fastness. Has wide application prospect in the field of uvioresistant textiles.)

1. A natural dye dyeing method based on rare earth coordination and having uvioresistant performance is characterized in that: the method comprises the following steps: firstly, carrying out oxygen bleaching treatment on the textile, then utilizing a rare earth compound and a natural dye to carry out coordination reaction to prepare a rare earth coordination natural dye, dyeing and washing the textile, and finally obtaining the natural dye dyed textile with uvioresistant performance.

2. The method for dyeing natural dye with ultraviolet resistance based on rare earth coordination as claimed in claim 1, wherein: the forms of the textile comprise fibers, yarns and fabrics; the materials of the textile include cotton, hemp, silk, wool and regenerated cellulose fiber.

3. The method for dyeing natural dye with ultraviolet resistance based on rare earth coordination as claimed in claim 1, wherein: the preparation method of the rare earth coordination natural dye comprises the following specific steps: dissolving a certain amount of natural dye in deionized water, adjusting the pH, adding a rare earth compound, stirring and heating to a proper temperature for complete dissolution, standing, naturally cooling, filtering and drying to obtain a primary product; further dissolving the primary product in a proper amount of deionized water, heating to boil, filtering while the solution is hot, repeating the process for three times, collecting filtrate, and freeze-drying to obtain the purified rare earth coordination natural dye.

4. The method for dyeing natural dye with ultraviolet resistance based on rare earth coordination as claimed in claim 3, wherein: rare earth elementThe compound is LnX₃Wherein Ln refers to light rare earth elements Pr, La, Ce or Nd, and X refers to halogen F, Cl, Br or I.

5. The method for dyeing natural dye with ultraviolet resistance based on rare earth coordination as claimed in claim 3, wherein: the natural dye comprises one of tea polyphenols, fructus Gardeniae yellow, alizarin red, and indigo blue.

6. The method for dyeing natural dye with ultraviolet resistance based on rare earth coordination as claimed in claim 3, wherein: the pH value needs to be adjusted to 4-6 before the natural dye and the rare earth compound react, and the mass ratio of the rare earth compound to the natural dye is 1: 3-6, the reaction temperature is 60-80 ℃, and the reaction time is 1-3 h.

7. The method for dyeing natural dye with ultraviolet resistance based on rare earth coordination as claimed in claim 1, wherein: the dyeing process specifically comprises the following steps: dissolving 1-4% (o.w.f) of rare earth coordination natural dye in deionized water, stirring and heating to 60-80 ℃ until the rare earth coordination natural dye is completely dissolved to obtain a dye solution, weighing a proper amount of textile subjected to oxygen bleaching treatment, soaking the textile into the dye solution, stirring and reacting at 60-80 ℃ for 30-90 min at a bath ratio of 1: 30-50, taking out, washing with cold water, washing with hot water, soaping, washing with hot water, washing with cold water, and drying.

Technical Field

The invention belongs to the technical field of textile dyeing and finishing, and particularly relates to a dyeing method which is suitable for dyeing by natural dyes and can improve the ultraviolet resistance of textiles.

Background

In recent decades, as the ozone layer is damaged and the amount of ultraviolet radiation is increased, the outdoor life and work of human beings are threatened, and ultraviolet protection textiles become research hotspots of vast scientists. At present, the ultraviolet-resistant textile achieves the ultraviolet protection effect mainly through coating, lamination and blended spinning treatment of an ultraviolet reflecting agent or an ultraviolet absorbing agent.

Through the treatment, the ultraviolet reflecting agent can endow textiles with ultraviolet resistance, but the textile has poor air permeability, hand feeling and fastness, and some textile can even cause anaphylactic reaction of human bodies, so the ultraviolet reflecting agent is only used for outdoor umbrellas, tents and the like. Most ultraviolet absorbers are organic compounds, which are expensive and tend to color fabrics, limiting their use in apparel.

The rare earth elements can receive exposed electron pairs of hydroxyl, carboxyl, amino and other groups to form stable coordination compounds due to the 4f and 5d empty orbits, and ultraviolet light is converted into visible light through radiation transition, so that the absorption of the ultraviolet light is realized. In recent years, natural dyes are widely concerned about ecological environment protection, and various natural dyes have abundant active groups such as hydroxyl, carboxyl, amino and the like, and can perform coordination reaction with rare earth elements.

Based on the rare earth coordination natural dye, the rare earth coordination natural dye is prepared by combining the natural dye and the rare earth compound, and the coordination vacancy is combined with the textile for dyeing, so that the textile is endowed with the ultraviolet resistance, and has good hand feeling, color and dyeing fastness.

Disclosure of Invention

The invention aims to overcome the defects of poor hand feeling and fastness of ultraviolet-resistant textiles and provides a dyeing method for improving the dyeing fastness of rare earth coordination natural dye and endowing the textiles with ultraviolet resistance.

In order to achieve the purpose, the invention adopts the following technical scheme that the method comprises the following steps:

a natural dye dyeing method based on rare earth coordination and having uvioresistant performance comprises the following steps: firstly, carrying out oxygen bleaching treatment on the textile, then utilizing a rare earth compound and a natural dye to carry out coordination reaction to prepare a rare earth coordination natural dye, dyeing and washing the textile, and finally obtaining the natural dye dyed textile with uvioresistant performance. The method specifically comprises the following steps:

the method comprises the following steps: pretreatment of textiles

The textile (the form of the textile comprises fibers, yarns and fabrics, and the material of the textile comprises cotton, hemp, silk, wool and regenerated cellulose fibers) → oxygen bleaching (hydrogen peroxide (30%) 2-8 g/L, penetrant JFC 1-6 g/L and scouring agent 1-8 g/L, the pH is controlled to 10-12, the bath ratio is 1: 30-50, the temperature is 80-95 ℃, and the time is 40-90 min) → cold water washing → hot water washing → drying.

Step two: preparation of rare earth coordination natural dye

Dissolving a certain amount of natural dye in deionized water, and adjusting the pH value to 4-6. Adding rare earth compound (rare earth compound refers to LnX)₃Wherein Ln refers to light rare earth elements Pr, La, Ce or Nd, X refers to halogen F, Cl, Br or I), stirring and heating to a proper temperature for complete dissolution, wherein the mass ratio of the rare earth compound to the natural dye is 1: 3-6. Keeping the temperature at 60-80 ℃, stirring and reacting for 1-3 h. Standing, naturally cooling, filtering and drying to obtain a primary product.

Further dissolving the primary product in a proper amount of ionized water, heating to boil, filtering while the primary product is hot, repeating the process for three times, collecting filtrate, and freeze-drying to obtain the purified rare earth coordination natural dye.

The natural dye comprises one of tea polyphenols, fructus Gardeniae yellow, alizarin red, and indigo blue.

Step three: dyeing of textiles

And (3) dissolving 1-4% (o.w.f) of the rare earth coordination natural dye prepared in the step two in deionized water, stirring and heating to 60-80 ℃ until the rare earth coordination natural dye is completely dissolved to obtain a dye solution. Weighing a proper amount of the textile treated in the step one, immersing the textile into the dye liquor, stirring the textile at a bath ratio of 1: 30-50 and at a temperature of 60-80 ℃, and reacting for 30-90 min. Taking out, washing with cold water, washing with hot water, soaping, washing with hot water, washing with cold water, and drying.

Compared with the prior art, the invention has the beneficial effects that:

1. the dyeing process is simple, saves dyeing auxiliaries, and is energy-saving and environment-friendly in production process.

2. The invention utilizes the coordination chemical reaction of rare earth elements to realize the coloring of textiles (cotton, hemp, silk, wool and the like) by natural dyes. Not only endows the textile with uvioresistant performance, but also has good hand feeling, color and dyeing fastness.

3. The invention firstly prepares the coordination natural dye in the dyeing process, and can realize the commercialization of the functional natural dye.

Drawings

FIG. 1 shows ultraviolet absorptivity of cotton fabric dyed by natural dye and rare earth coordination dye in embodiments 1-4. The rare earth coordination natural dye is proved to remarkably enhance the uvioresistant performance of the textile when being dyed;

FIG. 2 is an infrared spectrum of the rare earth complex dye of tea polyphenol of example 1. The tea polyphenols are 1235cm^-1、1684cm^-1Characteristic absorption peaks of phenolic hydroxyl C-O stretching vibration and ester carbonyl C = O stretching vibration respectively appear, and corresponding absorption peaks of tea polyphenol rare earth coordination dyes (tea polyphenol-La, tea polyphenol-Ce and tea polyphenol-Nd) are obviously weakened or disappear, so that successful coordination of tea polyphenol and rare earth compounds is proved.

Detailed Description

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below. The method of the present invention is a method which is conventional in the art unless otherwise specified.