JPH03213589A - Dyeing of fiber using anthocyanin - Google Patents

Abstract

PURPOSE:To obtain a dyed material having excellent fastness to light by mordanting yarn with a solution containing one or more metallic ions, dyeing the yarn in a dyeing bath containing anthocyanin and then mordanting the yarn with a metallic ion except the above-mentioned metallic ion. CONSTITUTION:Yarn, especially animal yarn is immersed and mordanted in a solution containing preferably copper ion, adjusted to pH 3.5-4.5, dyed in a solution containing anthocyanin and then subjected to after mordanting with a metallic ion such as aluminum ion or chromium ion except the metal used in the mordanting before the dyeing to give a dyed material having extremely excellent fastness to light.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an improvement in a method for dyeing fibers using and/anine.

(Conventional technology) Fiber dyeing using anthocyanins contained in plants is
It has been known since ancient times as a type of ``plant dyeing''. However, dyed fabrics obtained by soaking fabrics in an anthocyanin dyeing liquid extracted from plants have poor light fastness and have low market value.

Therefore, attempts were made to improve the light fastness by adding iron, aluminum, tin, antimony, chromium salts, etc. to the dye solution, but no product with marketable light fastness could be obtained. In addition, an attempt was made to improve the light fastness by adding an ultraviolet absorber to the dyeing solution, but this also did not yield good results.

In addition, attempts have been made to improve light fastness by mordanting the fibers with a copper-containing solution having a pH of 6 or higher before dyeing with a dyeing solution, but these efforts have not always been sufficiently effective.

(Problems to be Solved by the Invention) The present invention provides a method for improving the dyeing method using anthocyanins and greatly increasing the light fastness.

(Means for Solving the Problems) In the present invention, the second problem was solved by mordanting with a solution containing different metal species before and after dyeing with anthocyanin. That is, in the present invention, fibers are mordanted with a solution containing one or more metal ions, then dyed in a dye bath containing andonanine, and then a metal other than the metal used in the mordant before dyeing is dyed. Provided is a dyeing method characterized by mordanting with a solution containing ions.

The anthocyanin used in the present invention may be any anthocyanin normally contained in flower petals or pericarp, or preferably anthocyanin consisting of only one type of compound for dyeing and weaving applications where bright colors are to be obtained. It is known that anthocyanins collected from normal biological tissues are composed of multiple anthocyanin compounds, and for this purpose,
Cyanisin-3-arabinocyto, which is the only type of anthocyanin produced by Hanakirin cultured cells, is preferable (Japanese Patent Application Laid-Open No. 57-2697).

The fibers used in the present invention are various common fibers, such as protein-derived animal fibers (eg, silk, wool, etc.) or synthetic fibers (eg, polyester, acrylic, etc.).

From the viewpoint of anthocyanin adsorption properties, protein-based animal fibers such as silk and wool are preferred. These fibers may be subjected to various pretreatments, modifications, etc. in order to improve their dyeability.

In the present invention, before and after dyeing fibers with andonanine, mordanting is carried out with a solution containing metal ions. Various metal ions can be used, such as copper ions, aluminum ions, chromium ions, and iron ions. A mixture of these ions may also be used. What should be noted is that the metal ions used for mordant before dyeing (hereinafter referred to as pre-mordanting) and the metal ions used for mordanting after dyeing (hereinafter referred to as post-mordanting) must be different. If the same metal ion is used before and after dyeing, sufficient light fastness cannot be obtained.

The concentration of metal ions in the mordant solution is OO1-2.0 mol%,
Preferably it is 01 to 10 mol%. The mordant solution dissolves salt, which serves as a source of metal ions, in ion-exchanged water. pH of mordant
is preferably 2-8, more preferably 3-6. p
Adjustment of H is carried out with acids, especially hydrochloric acid. Mordanting is carried out under normal conditions or preferably by soaking the fibers at a temperature of 25 DEG to 40 DEG C. for 0.1 to 1 hour.

Pre-mordanting preferably uses copper ions. In the case of pre-mordanting using copper dye, a solution whose pH is adjusted to 3.5 to 4.5 is kept at 20 to 60°C, and the cloth or thread of the above fiber is placed in the bath for 30 minutes to 20 minutes. Mordant by soaking for an hour. Thereafter, the mordant is removed by thorough washing with water and air-dried. When copper ions are used for pre-mordanting, aluminum ions, chromium ions, and iron ions are suitable for post-mordanting. When using these ions, the dyed fabric is mordanted by immersing it in a solution (preferably an aqueous solution) containing metal ions at 25°C for 5 minutes to 2 hours. Thereafter, the mordant is removed by thorough washing with water and air-dried.

The dye bath liquid used in the present invention contains 0 of the above-mentioned andonanine.
．． A 01% (w/v) to 10% (w/v) aqueous solution is used after being adjusted to pH 4 or less, preferably pH 2.5 or less, more preferably pH 2 or less with hydrochloric acid or the like. If the pH is higher than 4, the dyeing property becomes purple instead of red, and the light fastness becomes poor.

The stronger the acidity, the better the results. Further, preferable results can be obtained by adding a compound having sulfonic acid to silk or wool. In addition to this, the red dyeability can also be improved by adding an electrolyte. As a compound having a sulfonic acid, when an arylsulfonic acid (for example, I.'tecylbensesulfonic acid, ], ]5-naphthalenesulfonic acid, 2-hydroxy-4-methoxybenzophenone 5-sulfonic acid) is used, red stainability,
Favorable results can be obtained in both light resistance. The amount of compounds containing sulfonic acid in the dye bath solution is 0.01% (w/
v) to 5% (w/v), favorable results are obtained in both red dyeability and light resistance. The amount of electrolyte present is 0.5
% (w/v) to 10% (w/v), favorable results for red stainability are obtained.

The above-mentioned dye bath is maintained at 80 to 95° C., and the fabric or thread of the “2” fibers is immersed in the dye bath solution for 30 minutes to 2 hours to dye. After that, the dyeing solution is removed by washing thoroughly with water and air-dried.

A light fastness test (JTSL-842) using a carbon arc lamp is performed on the dyed and woven fabric or dyed and woven thread obtained after post-mordanting to confirm the light fastness.

(Effects of the Invention) By the method of the present invention, the light fastness of metal-mordanted anth/anine dyed fibers improved from the conventional level 1 or below to grade 3.
-The market value has increased.

(Example) The present invention will be explained in more detail with reference to Examples. The present invention is not limited to these examples.

Friend'41-↓ 1 g of copper acetate was dissolved in ion-exchanged water of +, ooxc, and adjusted to pH 4, o with citric acid. A 5 cm square piece of silk or wool cloth was immersed in the 25°C solution for 1 hour.

The dyed cloth was taken out and soaked in running water to thoroughly remove the mordant, and then air-dried to remove moisture.

0.1% obtained by immersing 20 g of dried Hanakirin cultured cells in 1000 ffC of hydrochloric acid acidic aqueous solution of pH 2 and filtering it.
Cyanine 3-arabinondo water soluble? &100011Q,
Add 19% sodium chloride to the solution and adjust the pH of the dye bath solution with hydrochloric acid.
Adjusted to 4. The dye bath solution was transferred to a 200 mQ glass beaker and kept at 95°C. Mordanted silk or wool cloth was immersed in the dye bath solution for 1 hour and dyed. The dyed fabric was taken out and soaked in running water to remove the dyeing solution sufficiently, and then air-dried to remove water.

1g of iron acetate was added to 100m0. Dissolved in ion-exchanged water,
The obtained dyed fabric was immersed in the 25°C solution for 1 hour.

The dyed cloth was taken out and soaked in running water to thoroughly remove the mordant, and then air-dried to remove moisture. The dyeability and light fastness were observed. The results are shown in Table-1.

Practical Twisting λ The same process as in Example 1 was carried out except that 1 g of aluminum alum was used instead of iron acetate in Example 1. The results are shown in Table-1.

The process was carried out in the same manner as in Example 1 except that the p+-+ of the copper acetate aqueous solution in Example 1 was changed to 2.0. The results are shown in Table 1.

Practical Facility H--Processing was carried out in the same manner as in Example 1, except that the pH of the aqueous copper acetate solution was changed to 60. The results are shown in Table-1.

The process was carried out in the same manner as in Example 1, except that 1 g of aluminum alum was used instead of copper acetate. The results are shown in Table-1.

Claims (1)

[Claims] 1. After mordanting the fibers with a solution containing one or more metal ions, dyeing them in a dye bath containing anthocyanins,
A dyeing method characterized in that the material is then mordanted with a solution containing metal ions other than the metal used in the mordanting before dyeing.