JP3200714B2 - Thermochromic fabric and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermochromic fabric and a method for producing the same. More specifically, the present invention relates to a thermochromic fabric with significantly improved washing durability and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, a thermochromic fabric formed by adhering a resin liquid containing a thermochromic pigment to a fabric surface and drying the resin is disclosed in Japanese Patent Application Laid-Open No. 61-179371.

[0003]

DISCLOSURE OF THE INVENTION The present invention aims to provide a thermochromic fabric of this type in which the washing fastness and the like of this type of thermochromic fabric are remarkably improved by a secondary treatment, and a method for producing the same. is there.

[0004]

The thermochromic fabric of the present invention comprises a thermochromic layer in which a thermochromic pigment is fixed to a water-soluble resin or a film-forming resin in a dispersed state on the surface of each fiber constituting the fabric. Is formed, and an isocyanate resin or an isocyanate prepolymer, or an oil-soluble resin containing an isocyanate resin or an isocyanate prepolymer is attached to at least the surface of the thermochromic layer. Furthermore, the cloth is treated with a thermochromic processing liquid in which the thermochromic pigment is dispersed in a water-soluble resin solution or a synthetic resin emulsion, and the thermochromic pigment is fixed in a dispersed state on the surface of each fiber constituting the cloth. After forming the thermochromic layer, the isocyanate resin or isocyanate prepolymer, or a secondary processing liquid containing the isocyanate resin or the isocyanate prepolymer and an oil-soluble resin is adhered to the cloth, and dried. A method of fabric production is required.

In the above, it is effective to use a coarse or thin cloth having a weight per square meter (hereinafter, referred to as a basis weight) of about 5 to 250 g, and examples thereof include knitted and woven fabrics and nonwoven fabrics. The effect is remarkable in a net-like or lace-like thing or a thin tricot. In the case of a thick cloth exceeding 250 g, the texture tends to be hard due to the resin component attached between the fibers, which is not preferable for clothing or the like.

As the fiber material constituting the fabric, chemical fibers other than polyethylene and polypropylene, specifically, polyester, nylon, acrylic, vinylon, polyurethane, polyvinylidene chloride, rayon, cupra,
Acetate, triacetate, etc., or cotton, wool, silk,
Natural fibers such as hemp; Among them, lace-like knitting composed of nylon or polyester,
A thin tricot or the like can effectively exert the processing effect in the present invention. The thermochromic material forming the thermochromic layer contains three components of a conventionally known electron-donating color-forming organic compound, an electron-accepting compound, and an organic compound medium that reversibly causes a color reaction between the two. Thermochromic materials or thermochromic materials exhibiting thermochromic properties in the form of fine particles of a resin solid solution of the above components (for example, JP-B-51-35414, JP-B-51-44706, and JP-B-1-29398). Etc.). Further, a thermochromic material containing a color-memorizing thermochromic dye that exhibits a large hysteresis characteristic and changes color, that is, the shape of a curve plotting a change in coloring density due to a temperature change, changes the temperature from a temperature lower than the color changing temperature range. In contrast to the case where the temperature is raised and the case where the temperature is lowered from the higher temperature side than the color change temperature range, the color changes following a significantly different path, and in the normal temperature range between the low temperature side color change point and the high temperature side color change point, The aspect changed at a temperature below the low-temperature side discoloration point or below the high-temperature side discoloration point can be stored and stored).

[0007] The thermochromic material is usually used as a pigment encapsulated in microcapsules by a known method, and dispersed in an aqueous medium containing a synthetic resin emulsion or a water-soluble resin as a medium. Is configured. 25 parts to 400 parts of an aqueous binder component is added to 100 parts of the thermochromic pigment (hereinafter, part and part by weight are shown). As the aqueous binder component, various synthetic resin emulsions and various water-soluble resins are used. Specific examples include an acrylic emulsion, a urethane emulsion, a partially saponified ethylene-vinyl acetate copolymer emulsion, an acrylic-styrene copolymer emulsion, and a vinyl acetate-acryl copolymer emulsion. Specific examples of water-soluble resins include:
Polyvinyl alcohol, hydroxymethyl cellulose,
Methyl cellulose, sodium alginate, styrene-maleic acid copolymer, ethylene-maleic acid copolymer, methyl vinyl ether-maleic acid copolymer, polyacrylamide, polyacrylic acid soda, etc. Those having a hydroxyl group, a carboxylic acid group, an amide group, an amino group and the like are effective.

Next, a method for treating the fabric with the thermochromic working fluid will be described. As concrete means, screen printing,
Examples include gravure printing, doctor coat, reverse coat, impregnation, spray coating, etc., and the amount of thermochromic working fluid applied is 5 to 500 parts per 100 parts of fabric weight. Adjusted as follows. If the amount is less than 5 parts, no clear color change is exhibited, and if it exceeds 500 parts, the texture becomes hard.
After the above treatment, drying is performed by warm air or the like. Then
Isocyanate resin or isocyanate prepolymer,
Alternatively, treatment is performed with a treatment liquid having a viscosity (1000 mPa.S or less, preferably 600 mPa.S or less) in which the oil-soluble resin containing the resin or the prepolymer is compatible with a solvent.
Usually, secondary processing is performed by dipping or spraying the already processed thermochromic fabric in the processing liquid. By the application of the above-described relatively low-viscosity treatment liquid, the liquid permeates into the surface of each fiber constituting the fabric, and the reaction between the water-soluble resin or the film-forming resin as the fixing resin of the thermochromic layer and the isocyanate component is performed. Improves adhesive strength and film strength. The solid content of the resin required to provide the adhesiveness for improving the washing resistance is 100% of the solid content of the binder component in the primary processing.
Sufficient performance can be obtained by using 1 to 50 parts per part. If a hard finish is desired, up to 400 parts are used.

Next, the types of resins that can be used will be described. At least 5% or more of the resin solid content is an isocyanate resin or a prepolymer of isocyanate.
Must be used. If it is less than 5%, the desired adhesive strength cannot be obtained, and the washability cannot be improved. Specific examples of the isocyanate resin and its prepolymer include tolylene diisocyanate, diphenylmethane diisocyanate, dianisidine diisocyanate, triden diisocyanate, and hexamethylene diisocyanate. , Meta-xylylene diisocyanate, phenyl isocyanate,
Parachlorophenyl isocyanate, orthochlorophenyl isocyanate, metachlorophenyl isocyanate
G, 3,4-dichlorophenyl isocyanate, 2, 5
-Dichlorophenyl isocyanate, methyl isocyanate, ethyl isocyanate, n-butyl isocyanate
, N-propyl isocyanate, octadecyl isocyanate, 1,5-naphthalene diisocyanate, polymethylene polyphenyl isocyanate, triphenylmethane triisocyanate, trans vinylene diisocyanate -, Tris (4-phenylisocyanate-totithiophosphate), N, N '(4,4'-dimethyl3,3'
-Diphenyldiisocyanate) uresion, 4,
4 ′, 4 ″ -trimethyl 3,3 ′, 3 ″ -triisocyanate, 2,4,6-triphenyl cyanurate,
One or more of monomers or prepolymers such as 2,6-diisocyanate, methylcaproate and isophorone diisocyanate can be mentioned.

Incidentally, it can be used in combination with another oil-soluble resin for the purpose of adjusting the texture. As such resins, acrylate resin, polyurethane resin, polyester resin, vinyl acetate resin, polyol resin, methacryl resin, polyamide resin, terpene resin and the like can be used. The resin is dissolved in an appropriate drying solvent to form a secondary processing liquid, and is applied according to the above-described method for treating a thermochromic processing liquid. At this time, the adhesion amount is adjusted so that the solid content of the low-viscosity treatment liquid is 1 to 50 parts per 100 parts of the solid content of the aqueous binder component.

[0011]

The isocyanate component of the secondary processing solution reacts with the water-soluble resin or the film-forming resin as the binder component of the thermochromic layer formed on the surface of each fiber constituting the fabric to form a film of the thermochromic layer itself. It increases the strength and the adhesiveness to the fiber surface, and improves the washing strength. Since the secondary processing liquid has a relatively low viscosity, it penetrates not only to the surface of the thermochromic layer but also to the fiber surface, and effectively exerts the above-mentioned action. Thus, for fabrics made of synthetic fibers such as nylon or polyester,
The weak bonding strength using a water-soluble resin or a synthetic resin emulsion as a bonding medium can be reinforced by secondary processing.

[0012]

【Example】

Example 1 A net-like lath fabric (basis weight 10 g) knitted with nylon filaments was impregnated with thermochromic working fluid A. The impregnation process was performed using a rubber roll so as to adjust the drawing ratio (the ratio of the weight of the adhering processing liquid to the weight of the fabric) to 95%.
Next, using a secondary processing liquid, impregnation is performed in the same manner as described above (drawing ratio: 25%).
A thermochromic net-like lace fabric exhibiting a pink color below 0 ° C. was obtained. [Composition of thermochromic treatment liquid A] Thermochromic pigment (colorless at 30 ° C. or higher and pink at less than 30 ° C.) 18 parts Acrylic ester emulsion (solid content 47%) 72 parts Water-soluble Epoxy resin (crosslinking agent) 5 parts Sodium polyacrylate aqueous solution (solid content 30%, thickener) 5 parts

[Second working liquid A] Acrylic resin solution (solid content 60%, toluene solution) 50 parts Isocyanate prepolymer (toluene diisocyanate solid content 100%) 2 parts Xylene 418 parts Ethyl acetate 530 parts

A washing test was performed on the obtained thermochromic net-like lace fabric and the fabric before the secondary treatment. As a result, the fabric which had been subjected to the secondary treatment did not show any deterioration or the like and showed a good color change, while the fabric which had not been subjected to the secondary treatment did not show thermochromic properties and had a thermochromic pigment. It was confirmed that most of them had dropped out.

[Washing test method] JIS0217-103
It was carried out according to the law. That is, 2 g of a synthetic detergent for clothing is added and dissolved in 1 liter of water at a liquid temperature of 40 ° C. to prepare a washing liquid. A sample and a load cloth are put into the washing liquid so that the bath ratio becomes 1:30, and the operation of the washing machine is started. After treating for 5 minutes, the operation was stopped, the sample and the load cloth were dehydrated with a dehydrator, then the washing liquid was replaced with fresh water of 40 ° C., rinsed for 2 minutes at the same bath ratio, dehydrated, and dehydrated again. 2
Rinse for minutes and air dry.

Example 2 Nylon filament, cotton yarn, thread-shaped iris film (THE MEARL CORPO, USA)
REARION, IREARDESCENT
The thermochromic treatment liquid B was printed on a Russell lace fabric (basis weight 250 g) composed of FILM (trade name) by a gravure printing machine so as to have a weight of 30 g per square meter. Then, the secondary processing liquid B was spray-coated so as to be 60 g per square meter. The obtained Russell lace fabric has no gloss on the printing surface, but the gloss of the iris film remains from the back surface, and 3
It showed white at 0 ° C or higher and blue at less than 30 ° C.

[Composition of thermochromic treatment liquid B] Thermochromic pigment 75 parts (colorless at 30 ° C. or more, blue color at less than 30 ° C.) polyvinyl alcohol aqueous solution (solid content 20%) 20 parts Foaming agent 5 parts Water (for viscosity adjustment) 100 parts

[Composition of Secondary Processing Liquid B] Isocyanate prepolymer (xylene diisocyanate solid content: 75%) 10 parts Xylene 40 parts Ethyl acetate 50 parts

Example 3 A thermochromic treating solution A was applied to a sparkle tricot (basis weight 5 g) constituted by polyester filaments.
Was applied on a rotary screen from one side to 15 g per square meter. The obtained tricot exhibited white at 30 ° C. or higher, had blue and pink surfaces below 30 ° C., and exhibited purple in transmitted light.

[0020]

According to the fabric of the present invention, the isocyanate component of the secondary processing solution reacts with the water-soluble resin or the film-forming resin as the binder component of the thermochromic layer formed on the surface of each fiber constituting the fabric. In addition, it increases the film strength of the thermochromic layer itself, improves the adhesiveness to the fiber surface, and improves the washing strength.
Thus, the adhesive strength of the thermochromic layer containing the thermochromic pigment using the water-soluble resin or the film-forming resin of the synthetic resin emulsion as the bonding medium is secondarily determined for the cloth made of synthetic fibers such as nylon or polyester. Processing makes it relatively easy to reinforce, and it is possible to impart a thermochromic function having excellent washing strength to a lace or thin cloth made of this kind of synthetic fiber.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-41234 (JP, A) JP-A-60-228141 (JP, A) JP-A-2-15341 (JP, U) JP-A-4-15234 126596 (JP, U) JP 4-18543 (JP, B2) JP 4-10178 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) D06Q 1/00-1 / 12 B41M 5/26 A63H 33/22 B32B 1/00-35/00

Claims (4)

(57) [Claims] A thermochromic layer in which a thermochromic pigment is fixed in a dispersed state on a water-soluble resin or a film-forming resin is formed on the surface of each fiber constituting a fabric, and at least one of the thermochromic layers is formed. A thermochromic fabric characterized by having an isocyanate resin or isocyanate prepolymer or an oil-soluble resin containing the isocyanate resin or isocyanate prepolymer adhered to the surface. 2. A cloth is treated with a thermochromic processing liquid in which a thermochromic pigment is dispersed in a water-soluble resin solution or a synthetic resin emulsion, so that the thermochromic pigment is dispersed on the surface of each fiber constituting the cloth. After forming the fixed thermochromic layer, an isocyanate resin or an isocyanate prepolymer, or a secondary processing liquid containing the isocyanate resin or the isocyanate prepolymer and an oil-soluble resin is adhered to the cloth and dried. A method for producing a discolorable fabric. 3. The thermochromic fabric according to claim 1, wherein the fabric is a net-like or lace-like fabric knitted and woven with nylon filaments. 4. The thermochromic fabric according to claim 1 is clothing for a doll.