JPH0280679A - Color change cloth - Google Patents

Abstract

PURPOSE:To obtain color change cloth capable of readily changing color by will of wearer and excellent durability by providing cloth with a dyestuff to alter color by change of hydrogen ion concentration and fixing the resin to the surface of the cloth. CONSTITUTION:Cloth consisting of synthetic fiber, regenerated fiber or natural fiber is impregnated and provided with a dyestuff such as anthocyanin, flavonoid or acid-base indicator, a resin is fixed to the surface of the cloth to give color change cloth having durability and fashionability free from fading. A dyestuff to change color in a range of pH3-10 is safe and preferable in handling in a home.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a fabric whose color can be changed with a simple operation.

(Prior art and its problems) Fibers that change color depending on temperature are already known. However, fibers that change color due to temperature may change color due to an external factor (environment) such as temperature, and have the disadvantage that the color cannot be changed solely by the will of the wearer. Also, dry.

Due to external factors such as ironing, friction, or cigarette burns,
It has the disadvantage that it easily changes color regardless of the wearer's will. Other methods have also been proposed in which fibers are dyed, changed color, and developed using pH and oxidation-reduction reactions. For example, JP-A No. 5270186, JP-A No. 60-526
Publication No. 86 dyes fibers using an oxidation-reduction reaction, but it has the disadvantage that once it has been dyed (changed color), it cannot be bleached or changed to another color tone.
Dyeing (discoloration) itself is not something that can be done easily at home; JP-A-60-181379 proposes a fiber that can be dyed (discolored) in any color or pattern by attaching a pH indicator to the fiber. However, the pH indicator here is water-soluble and changes color, so when it comes into contact with an aqueous solution with a changed pH, the dye may elute or fall off, making it impossible to dye the entire fabric uniformly. Even in the case of partial patterning, bleeding of the pattern is unavoidable, resulting in extremely low-quality products.Furthermore, the dyes easily fall off or move due to washing or sweat, resulting in poor durability. Not at all.

The object of the present invention is to be durable, and to be able to easily change the overall hue and partial colors according to the will of the wearer, regardless of external factors such as temperature and light. The aim is to provide fibers that can be used. Another purpose is to remove the entire product from discoloration by simply exposing it to an aqueous solution or steam with a changed pH.
It is an object of the present invention to provide a fabric which can be colored and has good durability without the above-mentioned color non-uniformity. For example, we provide a new and durable fabric that allows the same garment to be worn red today and blue tomorrow, and even in many different colors and patterns. There is something to do.

(Means for solving the problems) The present invention provides that at least a portion of the fibers constituting the fabric are
It is a color-variable fabric that contains a dye that changes color depending on a change in pH of 4 degrees of hydrogen ion, and is made by fixing a resin to the surface of the fiber.

The material and form of the fabric used in the present invention are not particularly limited, and examples of the material include polyester,
These include synthetic fibers such as nylon, acrylic, polyvinyl alcohol, and polyvinyl chloride, chemical fibers such as rayon and acetate, natural fibers such as cotton, wool, and silk linen, and mixtures thereof. Moreover, as for the form, knitted fabrics, woven fabrics, nonwoven fabrics, etc. can be used. Furthermore, there is no problem if the fabric is subjected to conventional dyeing, printing, etc. before the dye of the present invention is attached thereto, and in some cases, the effects of the present invention can be brought out more efficiently.

The dye used in the present invention is not particularly limited as long as it changes depending on the degree of hydrogen ion (pH).

Hydrogen ion 21 degrees (pH) can be expressed by the following formula when the amount of hydrogen ions in the liquid is (H”), and it is 7 for neutrality,
It is less than 7 in acidic conditions and greater than 7 in alkaline conditions.

p t+ = 1. e (H”) pH Pigments whose color changes depending on pH include the plant pigments andonan and its analogues (andonanine, andonanine, etc.), flavonoids and their analogues (chalcones, flavanones, flavones, flavonols, etc.), and acid-base I Examples of acid-base indicators include phenolphthalein, malachite green, thymol blue merle orange, methyl red, and many other pH indicators.
is 0 (= dyes with a color change range from near to around 14 are known) 0 The color changing dyes used in the present invention include, of course, the dyes mentioned above, but the color change range is within 3 and the hue (
H) At least one of saturation (C) and brightness (V) is visible to the naked eye in the product (fabric), that is, the product (fabric) has one or more discoloration areas where the sum of the absolute values of changes in the Munsell symbol changes by 2 or more. Preferably.

Further, for example, in order for the wearer of clothing to change the color at home with a safe and simple operation, a material that changes color in the range of pH 3 to pH10 is preferable, and a material that changes color in the range of pH 4 to pH 9 is most preferable.

Within this range, acetic acid is easy to handle and safe.

This is because the color can be changed by treatment with a weak acid such as citric acid or oxalic acid or a weak alkali aqueous solution such as sodium carbonate or sodium bicarbonate. Can strong acids such as sulfuric acid, hydrochloric acid and dinitric acid, and strong alkalis such as sodium hydroxide and potassium hydroxide be diluted? If the 8 liquid is used, the pH can be kept within the above-mentioned preferred range, and it is also safe.

To adjust p II, salts of strong acids and weak alkalis, such as ammonium sulfate, salts of weak acids and strong alkalis, such as sodium acetate, can be used, and mixed solutions of acids, alkalis, etc., and salts, such as buffered? Liquid 8 can also be used for the purpose of color change and color preservation (maintaining a constant color) of the products of the present invention. Examples of color-changing dyes with a pH range of 3 to 1 are shown below.
Shown in the table.

It is sufficient that the dye is contained in at least a portion of the fibers constituting the fabric. In other words, it is sufficient that the dye is contained in the entire fabric, a part of the fabric, or a patterned part.Containing a dye may be uniformly dyed or dispersed within the fiber, and may be caused by the presence of a specific polymer. The dye may be dispersed only in the components. Alternatively, the dyeing may be unevenly distributed.
Further, the resin to be fixed to the fiber surface is not particularly limited as long as it has a high pigment retention property and does not easily fall off during use such as washing, cleaning, and wearing.

For example, rubbers such as SBR, NBR, ABR, BR, dimethyl nolicone, methyl ethyl silicone, amino-modified silicone 7 epoxy-modified silicone 1, silicone resins such as Milanol silicone, Volite I, lafluoroethylene, polyhexafluoropropylene, Polypurfluoroethylene propylene copolymer, perfluoro resin such as polyperfluorobutanene, polyperfluoromethyl acrylate, polyperfluoroethyl acrylate]
・Polyvinyl chloride, copolymers thereof, etc.

Polyvinyl acetate, polyamides, polyesters, polyethers, polyolefins such as polyethylene and polypropylene, and their modified products, etc., cellulose 1, acetyl cellulose 1, cellulose modified products such as carboxyl methyl cellulose, hydroxyethyl cellulose, phenolic resins, and raw materials. Resins such as formalin resins and epoxy resins can be used. Preferably, those that can be used in the form of an aqueous solution, aqueous dispersion, or an aqueous emulsion are preferred. In addition, it is preferable to use a material that has good affinity with the dye and does not easily release the dye.

Regarding the hydrophobicity of the resin surface, the contact angle of water to the resin surface is preferably 80 degrees or more, more preferably 90 degrees, in order to prevent the pigment from falling off and to suppress color bleeding in the case of discoloration.
That's all. Also, in order to improve the adhesion and durability of the resin coating, it is preferable to crosslink the resin coating to some extent. In particular, for phenol resins, urea resins, formalin resins, epoxy resins, etc., crosslinking to the same degree as normal resin processing for fabrics is preferable. However, fluorinated acrylic resins, silicone resins, urethane resins, etc. are preferable from the viewpoints of resin film formation, durability, texture, color development, etc. However, depending on the use, purpose, It can be selected as appropriate depending on the method, and is not limited to this.

Deposition of the resin onto the fibers can be accomplished by conventional methods. For example, dipping-drying method, printing method, coating method,
This can be done by a spray method, etc., and may be selected depending on the purpose. Moreover, it is even more effective to use multiple methods. For example, multilayer coating with different pigment-containing resins,
By printing specific designs on the coating layer, even more fashionable clothing can be made. After adhering the resin, it is dried, and if necessary, cured and washed with water.

The amount of dye attached to the fibers is at most 5% by weight, preferably 0.1 to 3% by weight.

If it exceeds 5% by weight, a large amount of pH-changing aqueous solution will be required to achieve the desired color development or discoloration, and color bleeding or pigment loss will also occur, which is undesirable.If it is less than 0.1% by weight, the color development or discoloration will become obvious. do not.

The amount of resin attached to the fibers is expressed as the thickness of the resin coating.
It is at most 30μ, preferably from 0.3 to 10μ. 0.3
If it is thinner than μ, the protective effect of the resin will not be sufficiently expressed. Moreover, if the thickness is more than 30 μm, the texture of the fabric becomes boar-bore or stiff.

Hereinafter, preferred embodiments of the present invention will be summarized.

(b) Discoloration in which the sum (S) of the absolute values of changes in hue (H), saturation (C), and brightness (V) of the Munsell color standard is at least 2 when aqueous solutions with 3 different pH+ are deposited. The fabric according to claim 1, which has an area.

(b) The fabric according to claim 1, in which the pigment has two or more discoloration areas.

(c) The fabric according to claim 1, wherein the contact angle of water to the surface of the resin is 90'' or more.

2) The fabric according to claim 1, wherein the resin is a fluorine-based acrylic resin.

(e) The fabric according to claim 1, wherein the resin is a silicone resin.

(f) The amount of resin adhered is 0.3 to 10 in terms of the thickness of the resin film.
The fabric according to claim 1, which is μ.

g) The fabric according to claim 1, wherein the amount of dye attached is 0.1 to 3% by weight.

(Effects of the Invention) The color-variable fabric of the present invention is a six-pronged fabric that has an unprecedented function and fashionability in that the overall color and partial pattern can be formed and changed arbitrarily and easily according to the will of the wearer. Since the resin layer sufficiently retains the pigment that contributes to color generation, there is no significant decrease in color development or discoloration even if the color is repeatedly changed. Furthermore, it is fully practical, with no fading or uneven coloring even after repeated selection, sweat, rain, etc.

(Examples) Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1 Score roll C-1i of cotton cloth (10 cm square).

Purification treatment was performed at 60°C for 20 minutes (2 g/e, bath ratio 1:100). Then bromcresol green Ig
Dissolve it in a small amount of ethyl alcohol, add water and make 2X
A 10-'wt% aqueous solution was prepared. 33 mj of purified cotton cloth! The mixture was placed in an aqueous bromcresol green solution, heated to 100°C with stirring, and treated at 100°C for 20 minutes.

The dyeing rate was about 1% based on the cloth.

Next, water-based emulsions of various resins shown in Table 3 were applied to the cloth by spraying in an amount of 1% by weight based on the cloth, followed by drying and curing.

Subsequently, an aqueous solution of pH 2, pH] 2 was applied by spraying to cause discoloration. For the items coated with the pH 2 solution, a pH 12 solution was further applied over them to see if the discoloration occurred reversibly. Color development and discoloration were evaluated by measuring the air-dried cloth using a Maches Color Eye and using the Munsell color system H (hue) (lightness) and C (chroma). The contact angle of the resin used with water was determined by applying the resin emulsion onto a filter paper by spraying, drying it repeatedly, applying a sufficiently thick resin film, and then curing it at 170°C for 10 minutes. It was measured using an angle measuring device (manufactured by Kyowa Kagaku). The results are shown in Example 2. A cloth obtained by the same resin treatment as in Example 1 was prepared at a bath ratio of 1:1.
After washing in hot water at 0.60°C for 10 minutes with slow stirring, the clothes were air-dried. Example 3 of removing the resin by washing measured from the change in weight I of the cloth before and after immersion in the bath.A cotton cloth of 8 cm x 8 cm was pretreated with score roll Cl.
10 (2 g/l, bath ratio 1:1OO) at 90°C
A minute I# training process was performed. Dissolve 1g of indicator in as much ethyl alcohol as possible, add water and mix 2.0X.
Adjusted to IO-ff% water/8e.

The cotton fabric of the scouring method was placed in an indicator liquid adjustment solution, heated to 100° C., and dyed for 20 minutes (dying rate was approximately 1% based on the weight of the fiber).

Next, a silicon emulsion was applied as a dye fixing agent to the cotton cloth to which the indicator dye was attached using a spray. The adhesion rate of the fixing agent 41 was about 2% based on the weight of the fibers.

For the cotton cloth treated as described above, pH 2
, pH 4, pl (7, pH 9, and pH 12) were applied to each cloth, and the state of discoloration and color development was observed.

Using a color analyzer, check the hue before and after the color change 5 (
H), brightness (V), and image (C) were measured.

The measurement results are shown in Table 4, and the results of the visual evaluation are shown in Table 5.

It quickly returned to colorless.

Also, if you apply an acidic liquid to a part that has been discolored by an alkaline liquid, the color will be reversible.

[Brief explanation of the drawing]

FIG. 1 shows a partially patterned case of the fabric of the invention, and FIG. 2 shows a cross section of the fiber of the invention. In FIG. 2, 1 indicates a fiber dyed or dispersed with a dye, and 2 indicates a resin layer. Procedural amendment June 1, 1989 Patent Application No. 227947 2, Name of the invention Color variable fabric 3, Relationship with the person making the amendment Patent applicant address 17 Sumida 5-chome, Sumida-ku, Tokyo No. 4, day 5, number of inventions increased by amendment None 6, "Detailed description of the invention" column 7 of the specification subject to the amendment, content of the amendment (1) " Above 105@
The following is corrected. ``4゜〒534 1-5-90 Tomobuchi-cho, Bejima-ku, Osaka-shi, Japan Patent Department, Kanebo Co., Ltd. Tel: (06) 921-1251 Date of amendment order

Claims (1)

[Claims] (1) A color-variable fabric in which at least a portion of the fibers constituting the fabric contain a pigment that changes color depending on changes in hydrogen ion concentration (pH), and a resin is fixed to the surface of the fiber.