JPH07166480A - Dyeing with phycocyanin - Google Patents

Abstract

PURPOSE:To provide a dyeing method capable of easily and safely dyeing to beautiful blue color which has not been obtained with conventional natural dye by using phycocyanin which is a natural dye harmless to the health. CONSTITUTION:This process for the dyeing with phycocyanin comprises the dyeing of a fiber in a dyeing bath containing phycocyanin and the post-treatment of the dyed fiber with an acid. As an alternative, fiber is dyed in a dyeing bath containing phycocyanin, post-treated with an acid and then treated with a metal salt.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a phycocyanin dyeing method, and more specifically, it uses phycocyanin, which is a natural pigment that does not harm health, to produce a beautiful blue color that cannot be obtained with conventional natural dyes. The present invention relates to a dyeing method for easily and safely dyeing.

[0002]

2. Description of the Related Art In recent years, with the deepening of interest in safety and health, dyeing with natural dyes has been reviewed, and colorful clothing with dyeing of natural dyes has been desired. In order to meet this demand, various kinds such as safflower and purple root have been demanded. It is practiced to dye clothes with colorful natural dyes.

[0003]

However, in order to obtain a blue color tone with a natural dye, indigo is generally used,
Even though odorous wood is used, no one that gives a vivid blue color tone has been obtained yet.

In view of the above situation, it is an object of the present invention to provide a dyeing method capable of easily and safely dyeing a bright blue color with a natural dye that does not harm health.

[0005]

Means for Solving the Problems The present invention uses phycocyanin as a natural pigment, dyes a fiber in a dye bath containing this phycocyanin, and then post-treats it with an acid to easily and safely produce a bright blue color. It is designed to be dyeable.

[0006] Further, after dyeing the fiber in a dye bath containing phycocyanin, it is post-treated with an acid and then treated with a metal salt so that a bright blue color can be dyed easily and safely, and the fastness to sunlight is increased. Is a good one.

The phycocyanin used in the present invention is a natural pigment contained in algae such as cyanobacteria, red algae and cryptoalgae, and has an extremely beautiful blue color tone belonging to phycobilin pigments.

In particular, Spirulina, which is a kind of cyanobacteria,
Belonging to the genus Lemur, Spirulina and having a higher content of this phycocyanin than other cyanobacteria, it is used as a health food or as a protein source, so it can be used as a safe dyeing material. Is preferably used as a safe dye.

However, while this phycocyanin has an extremely beautiful blue color tone and is suitable as a safe pigment, it does not have a great affinity for fibers, and the fibers can be dyed to a practical concentration by ordinary dyeing methods. It is difficult to dye and cannot be used as a dye as it is. This is probably because the phycocyanin molecule is always bound to a high-molecular weight protein component, and unlike other natural pigment molecules, it does not easily penetrate and adsorb into the amorphous region of the fiber.

Therefore, when dyeing with this phycocyanin, phycocyanin is adsorbed on the fiber in an aqueous solution by utilizing the fact that phycocyanin has a considerable water solubility and that it precipitates and precipitates under acidic conditions. After soaking, it is preferably treated in an aqueous solution of an acid, and when treated in an aqueous solution of an acid, phycocyanin is deposited and fixed on the fiber.

Therefore, when dyeing with phycocyanin is carried out by dissolving phycocyanin in water, immersing the fibers therein, and then introducing these fibers into an aqueous solution of an acid, phycocyanin is deposited on the fibers, It is fixed, the color density of the fiber is increased, good dyeing is performed, and a bright blue color tone is obtained.

Then, by repeating the operation of immersing the phycocyanin in water in which it is dissolved and the operation of introducing this fiber into an aqueous solution of an acid, the dyeing density can be increased.
Practical dyeing is done.

Further, if a metal salt treatment is carried out after these dyeings, the fastness to sunlight and the like are sufficiently improved, and a product which can be practically and sufficiently used can be obtained.

As described above, when phycocyanin is dissolved in water and the fibers are immersed therein, and then the fibers are put into an aqueous solution of an acid, the dyeing is repeated. The bath ratio when immersing the fiber in the aqueous phycocyanin solution is preferably in the range of 1:10 to 1:50. If the bath ratio is too small, uneven dyeing tends to occur.
If it is too large, the dyeing amount will decrease.

At this time, the concentration of the phycocyanin aqueous solution in which the fibers are immersed is 0.5 to 2 with respect to the fibers to be dyed.
It is preferable to set it within the range of 0.5% by weight, and if it is less than 0.5% by weight, dyeing with phycocyanin cannot be satisfactorily performed, and if it is too large, unevenness occurs and uniform dyeing cannot be obtained.

The temperature at this time is 20 to 40 ° C.,
It is preferable to dye for 1-2 hours, and the temperature is 20 ° C.
If it is lower than 40 ° C, the amount of dyeing is reduced, and if it is higher than 40 ° C, decomposition of the dye is likely to occur. If the time is too short, a practical dyeing amount cannot be obtained, and if it is too long, level dyeing is difficult to obtain.

Further, as the aqueous solution of acid that is added to insolubilize the phycocyanin after immersing the fiber in the aqueous solution of phycocyanin, an aqueous solution of acetic acid, tannic acid, citric acid, polyphosphoric acid or the like is preferably used.

Such an aqueous acid solution has an acid concentration of 5 to 1
It is preferable to use it within the range of 0% and the bath ratio within the range of 1:10 to 1: 100. When the acid concentration is less than 5%, phycocyanin is difficult to insolubilize, and when it exceeds 10%, the fiber is damaged. May occur.

Dyeing with phycocyanin is carried out in this way, but if a metal salt treatment is further carried out after this dyeing, the fastness to sunlight and the like will be improved, so it is preferable to carry out a metal salt treatment.

In this metal salt treatment, the concentration of dissolved salts of nickel, copper, aluminum, magnesium, etc. is 1 to
It is carried out by immersing in a 5% aqueous solution at a bath ratio of 1:10 to 1: 100 at 20 to 30 ° C. for 10 to 20 minutes.
If the salt concentration is less than 1%, the fastness to sunlight cannot be sufficiently improved, and if the salt concentration exceeds 5%, uniform treatment becomes difficult.

The bath ratio is too small or the temperature is 20 ° C.
If the temperature is lower or the treatment time is shorter than 10 minutes, the fastness to sunlight is not sufficiently improved, and if the bath ratio is too high, the temperature is higher than 30 ° C, or the treatment time is longer than 20 minutes, the dyes and fibers May be damaged.

As described above, the fibers dyed with phycocyanin, which is a natural pigment, include natural fibers and
All fibers such as artificial fibers are used, and in particular, knitted fabrics, non-woven fabrics and threads made of natural fibers such as silk, wool, cotton and hemp and artificial fibers such as rayon are dyed well.

[0023]

EXAMPLES Next, examples of the present invention will be described. Example 1 100 g of phycocyanin obtained by purifying Spirulina
Is dissolved in 2 l of water to prepare a dye bath, in which silk white cloth 1
00 g was immersed at 40 ° C. for 1 hour. Then, the silk white cloth was taken out from the dyebath and put into 10 l of a 10% aqueous solution of tannic acid.

After dipping such a silk white cloth in a dyeing bath and introducing it into an aqueous tannic acid solution three times, it is immersed in 5 l of a 1% aqueous solution of nickel sulfate at 30 ° C. for 20 minutes for metal salt treatment. went. The silk cloth dyed in this way is
It was dyed in bright greenish blue.

Example 2 Example 1 was repeated except that a 10% aqueous solution of tannic acid was replaced with a 10% aqueous solution of citric acid.
The silk white cloth was dyed in the same manner as in (1). The silk cloth dyed in this manner was dyed in bright greenish blue.

Example 3 A white cotton cloth was dyed in the same manner as in Example 1 except that the white cotton cloth was used instead of the white silk cloth. The cotton cloth dyed in this manner was dyed in a bright greenish blue color.

Example 4 A rayon non-woven fabric was dyed in the same manner as in Example 1 except that a rayon non-woven white fabric was used in place of the silk white fabric. The rayon nonwoven fabric dyed in this manner was dyed in a bright greenish blue color.

Example 5 A white silk cloth was dyed in the same manner as in Example 1 except that the metal salt treatment was omitted. The silk cloth dyed in this manner was dyed in a bright blue color.

Example 6 A white silk cloth was dyed in the same manner as in Example 2 except that the metal salt treatment was omitted. The silk cloth dyed in this manner was dyed in a bright blue color.

Example 7 A white cotton cloth was dyed in the same manner as in Example 3 except that the metal salt treatment was omitted. The cotton cloth dyed in this manner was dyed in a bright blue color.

Example 8 A white non-woven fabric of rayon was dyed in the same manner as in Example 4 except that the metal salt treatment was omitted.
The rayon nonwoven fabric dyed in this manner was dyed in a bright blue color.

Comparative Example 1 A silk white cloth was dyed in the same manner as in Example 1 except that the addition to the tannic acid aqueous solution was omitted, but a dyeing amount of a practical density was obtained. Moreover, the silk cloth could not be dyed in a bright blue color.

The dyed cloths obtained in the respective examples were subjected to a daylight fastness test. Sunlight fastness test is an accelerated weathering tester, Suntester, which has an ultraviolet distribution closest to sunlight.
It was carried out using the X-1 type and evaluated in a grade of 1 to 8 in comparison with fading of blue scale. In addition, the dyeing with a natural dye is sufficiently practical in the grade 3, and the fastness to sunlight in dyeing with safflower, purple root and the like, which are famous natural dyes from ancient times, is usually grade 1. Table 1 below shows the results.

[0034]

[0035]

As is apparent from the above Table 1, dyeing cloths such as silk, cotton and rayon have poor dyeing properties and have a fastness to sunlight of about 1st grade unless tannic acid is used. On the other hand, the dyed cloth such as silk, cotton and rayon dyed by the method of the present invention has a practical dyeing amount obtained by using tannic acid, and at the same time has improved fastness to sunlight. In addition, those subjected to metal salt treatment (Examples 1 to 1
In 4), the fastness to sunlight is further improved.

From this, according to the method of the present invention,
With phycocyanin, which is a natural pigment, clothing can be dyed in bright blue, and dyed cloths such as dyed silk, cotton and rayon have good fastness to sunlight and can be put to practical use sufficiently. It turns out to be a thing.

Further, the dyeing with phycocyanin, which is a natural pigment, uses the pigment contained in algae which is the safest for human beings and is easily available. Beautiful blue dyeing can be done easily and cheaply. Further, there is no fear of environmental pollution due to dyeing waste water, and industrially excellent dyeing can be performed.

Claims (2)

[Claims] 1. A method for dyeing with phycocyanin, which comprises dyeing a fiber in a dye bath containing phycocyanin and then post-treating with an acid. 2. A method for dyeing with phycocyanin, which comprises dyeing a fiber in a dye bath containing phycocyanin, post-treating with acid, and then treating with a metal salt.