JPS5857546B2 - Dyeing method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for dyeing fabrics.

Conventionally, fabrics are dyed using various methods such as ground printing, gravure coating, spray coating, and putting, etc. After applying a dye solution to the fabric by means such as printing, coating, or impregnation, dry heat or A method of fixing dyes using steam heat is known.

However, these methods tend to cause peeling and white spots due to migration of the dye solution and poor penetration of the dye solution into the fabric structure, and they also have drawbacks such as difficulty in dyeing fluff, making it difficult to achieve uniform quality. Dyeing is difficult, and even now it is difficult to dye some materials and fabrics, and the reality is that dyeing is only possible in a limited hue and density range.

As a result of intensive research in view of the above problems, the present inventors have discovered a dyeing method with exceptional effects, and have completed the present invention by eliminating the deficiencies of the existing methods. The purpose is to provide a dyeing method with excellent level dyeing properties by eliminating various unevenness caused by migration, penetration of the dye solution, defective fluff dyeing, etc.

Another object of the present invention is to provide a dye liquor to be used in the above-mentioned dyeing method, a method for producing the same, and an advantageous and economical dyeing method for producing dyed products without any trouble.

Further objects and advantages will become apparent from the description below.

The above-mentioned purpose is to use a polymeric surfactant (hereinafter referred to as a foaming agent) that exhibits a foaming action when heated in a dyeing method in which a dye solution is applied to fabrics by means such as printing, coating, or impregnation.

) and a dye solution are applied to fabrics and then heated and foamed (thus, they are distantly related).

In the present invention, in order to cause foaming after applying the dye liquor, a foaming agent is usually added to the dye liquor or a foaming agent is applied to the fabric by pre-dying treatment, and after applying the dye liquor, Foaming is caused by heating, and the foaming agents referred to in the present invention include:
Water-soluble polymeric surfactants such as polyvinylpyrrolidone, polyalkylene oxide, polyacrylic acid derivatives, and polyacrylamide derivatives, which are foamed using air expansion during heating, can be used.

The blowing agents that can be used in the present invention are not limited to those mentioned above, but include various modified products of each of the above substances,
Any polymeric surfactant that exhibits a foaming action when heated can be used alone or in combination.

In actual use, auxiliary agents and sizing agents may be used in combination to control the degree of foam generation and size stability.As sizing agents, it is preferable to use one that has the ability to form a film. In order to maximize the level dyeing effect, it is necessary to select the blowing agent according to the type and amount.
This can be determined by testing in advance.

When these foaming agents are added to the dye liquor (this is
The foaming agent is dissolved or dispersed in a dye liquor consisting of a corresponding dye and a dyeing aid.

Since the degree of foaming varies depending on the type of foaming agent and the heating conditions, the amount is usually 0.1 to 10% more than the dye liquor (although it is difficult to say in general).

On the other hand, when applying a foaming agent to fabrics by pre-dying treatment, it is sufficient to apply a solution or dispersion of the foaming agent by impregnation, spraying, etc., and drying. However, if necessary, a sizing agent may be added as a binder. It's good to do that.

After that, a normal dye solution is applied. The fabrics coated with the dye liquor in this manner are then subjected to heat treatment to cause foaming.

The heating means may be dry heat, saturated steam, superheated steam, etc., but the temperature must be selected within a temperature range that does not deteriorate the target fiber material and allows the foaming agent to foam effectively.

Although the processing time depends on the heating energy density, the minimum time necessary for effective foaming is the minimum time required, and the processing time can be determined based on the unevenness of the product.

Next, the dye is fixed by drying, coloring, or S coloring treatment.

As described above, the heating and foaming treatment may be provided separately, but it may also be carried out simultaneously with the coloring or drying treatment in the process of coloring the fabrics to which the dye solution has been applied or coloring the fabrics after drying.

Next, the product is obtained by washing, soaping, finishing, etc. as usual.

In this way, plain dyeing can be obtained by coloring fabrics to which a dye solution has been applied by printing, coating, or impregnation, but if a dye that can be removed with a reducing agent or other agent is used, it can be used for discharge printing. A beam is obtained.

In addition, if the method of the present invention is applied after printing with a physical or chemical resist paste, a pre-resist print can be made.Conversely, by applying the present invention, after drying the fabric to which the dye liquid has been applied, the resist paste is applied. It goes without saying that a post-resist print can be obtained by printing and coloring.

In the present invention, fabrics refer to knitted fabrics, nonwoven fabrics, and the like.

The effect of the present invention is to prevent the unevenness of each ridge beam.

That is, the first step is to uniformly dye the inside of the tissue of the fabric.

The dyeing inside the tissue varies depending on the structure of the target fabric and the viscosity of the dye solution, but at present, the dyeing inside the tissue becomes uneven, which tends to cause defects such as peeling and vitiligo.

These drawbacks are that heat transfer printing is not easy to remove, but
Compared to immersion dyeing, which dyes uniformly to the inside of the fabric, differences in dyeing concentration tend to occur between the surface and the inside of the fabric, and differences in dyeing concentration occur not only when the fabric is slightly stretched, but also when the fabric is not stretched, depending on the tissue. can be visually recognized, resulting in a kind of uneven color.

In addition, if a strongly foamed dye liquor is used in the same dyeing process, the penetration of the dye liquor into the fabric becomes poor and the above-mentioned defects are more likely to appear, but according to the method of the present invention, the dye liquor (There are no bubbles, or there are only a few bubbles, so they do not cause any problems when applying the dye solution, and in order to cause foam to form after the dye solution is applied, these bubbles seem to spread the dye solution to every corner of the tissue. Can be dyed without uneven dyeing such as eye peeling or vitiligo.

Next, when dyeing brushed products or fabrics using spun yarn,
Conventionally, after applying a dye solution, once it dries and develops the color, the dyeing of the fluff is very poor, and if the dye is left undried and the color develops, the fluff is hardly dyed in some areas, resulting in so-called frosting. The drawback is that this gives the surface of the fabric a very harsh feel.

According to the method of the present invention, in any case, the dyeing of the fluff is good and the appearance is uneven (copper), and it is extremely effective in removing uneven dyeing in this sense.

The second effect appears when the present invention is used in conjunction with discharge printing.

Conventionally, when ground dyeing is carried out using a method similar to that of the present invention in combination with anti-discharge printing, attempts have been made to improve the uneven dyeing by adding various auxiliaries to the dyeing solution. However, if, for example, a penetrating agent is added to allow the dye solution to sufficiently penetrate into the tissue, the anti-discharge printing becomes susceptible to bleeding and halation.

The current method of discharge printing, which is dyeing, is done by dipping into the ground.
Even when discharging cloth that has been thoroughly washed,
Bleeding and halation occur frequently, and discharge printing is said to be an extremely risky method compared to direct printing.How to reduce the defective rate caused by these is an important issue for discharge prevention. One of the things is being done.

The method of the present invention can eliminate these defects and is advantageous not only in terms of the quality of discharge-proof prints but also in terms of production.

As described above, the present invention eliminates various defects that occur in conventional dyeing or anti-discharge prints, and makes it possible to stably produce dyed or anti-discharge prints with excellent quality using a simple method. However, its industrial utility value is extremely limited.

The present invention will be specifically described below with reference to Examples, but the present invention is of course not limited to these three Examples.

In the examples, parts represent parts by weight.

Example 1 A dye solution shown in Table 1 was stirred on an acrylic spun fabric to create minute bubbles, and a gravure coating Q was applied thereto, followed by drying with an infrared lamp.

Table 1 Cationic dye Maxilon Blue GRL (Chino g 2
0 parts acetic acid 15
Part tartaric acid 15 parts Polypropylene oxide and polio before foaming 1] Oxyethylene block polymer 3oH5 parts
Re locust bean gum 200 parts water
720 copies of this material was printed with a resist dyeing paste containing the cationic dye Astrazon Pink FG (Bayer) and stannous chloride, dried, and then heated at 105°C for 15 minutes.
Steamed for a minute and washed with water.

The obtained product was a colored resist-dyed product with good fluff in the ground color area, no irritation, and good print quality.

For comparison, the same procedure as above was carried out except that no foaming agent was added to the dye liquor, and the dyeing of the fluff in the ground color area was weak, and the level dyeing was lacking as a whole.

Claims (1)

[Scope of Claims] 1. In a dyeing method in which a dye liquid is applied to fabrics by means such as printing, coating, or impregnation, a polymeric surfactant that exhibits a foaming effect when heated and a dye liquid are applied to fabrics. A dyeing method characterized by heating and foaming after application. 2. The dyeing method according to claim 1, wherein a polymeric surfactant is added to the dye liquor and applied to the fabrics. 3. The dyeing method according to claim 1, wherein a polymeric surfactant is applied to the fabrics in advance of the dyeing solution.