JPH059868A - Reversible color changing endothermic fabric - Google Patents

Abstract

PURPOSE:To obtain an endothermic fabric capable of thermally changing color within a specific temperature region (a relatively low-temperature region), effectively absorbing near infrared rays only in a changed color state, developing heat absorbing properties and providing feeling of warmth. CONSTITUTION:A reversible color changing endothermic fabric is obtained by forming a film layer of 5-40 pts.wt. microcapsules enclosing a heat reversible near infrared absorbing composition composed of a compatible substance containing (A) an electron donative near infrared absorbing organic compound, (B) a compound which is electron accepting for the organic compound, (C) a compound that is a reaction medium for reversibly initiating the electron donating and accepting reaction by the components (A) and (B) within a specific temperature region as essential components in a dispersed state in 60-95 pts.wt. synthetic resin on the front surface or back surface of a fabric.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a reversible color-changing endothermic fabric. More specifically, the present invention relates to a heat-absorbing fabric made of woven fabric, knitted fabric, non-woven fabric, or the like, which is configured to effectively and selectively absorb solar heat in a specific temperature range.

[0002]

2. Description of the Related Art Heretofore, there has been disclosed a heat-absorbing cloth using fibers obtained by polymer blending or adsorbing a near-infrared absorbing substance such as an anthraquinone compound, a metal complex compound, a cyanine compound (JP-A-1-266274). Publication).

[0003]

The conventional heat-absorbing cloth, when exposed to sunlight, always absorbs near-infrared rays to obtain heat-absorbing property regardless of environmental temperature. The heat-absorbing and heat-retaining fabric is required for clothing and the like in an environment where the outside air temperature is low, and is not necessarily required in an environment where the outside air is relatively warm or hot, and is rather an unnecessary requirement. is there. The present invention has a specific temperature range (relatively low temperature range)
We provide a heat-absorbing fabric that heat-discolors with heat and effectively absorbs near-infrared rays only in the discolored state to develop a heat-absorbing property, making you feel warm, and applying it to sports clothes, winter clothes, leisure clothes, etc. It is an attempt to raise it.

[0004]

The heat absorbing cloth of the present invention comprises (a) an electron donating near infrared absorbing organic compound, and (b)
Compounds that are electron-accepting for the organic compounds, c)
Encapsulating a thermoreversible near-infrared absorbing composition composed of a compatible solution containing a compound, which is a reaction medium that reversibly causes an electron transfer reaction by the components (a) and (b) in a specific temperature range, as an essential component The reversible color-changing endothermic fabric has a requirement in which 5 to 40 parts by weight of the microcapsules are dispersed in 60 to 95 parts by weight of a synthetic resin on the front surface or the back surface of the cloth. If necessary, a suitable protective layer can be provided on the surface of the coating layer.

In the above, (a) the electron-donating near-infrared absorbing organic compound is an ethylenophthalide compound (for example,
Bis-3,3- [bis-1,1- (P-dimethylaminophenyl) ethyleno-2] -4,7-diazaphthalide,
Bis-3,3- [bis-1,1- (P-dimethylaminophenyl) ethyleno-2] phthalide, a fluorene compound (for example, 3,6-bis (dimethylamino) fluorene spiro (9,3 ')- 6'-Dimethylaminophthalide [manufactured by Yamamoto Chemical Co., product name Green118, colorless ← → blue-green], 3,6-bis (diethylamino) fluorenspyrro (9,3 ')-4'-azaphthalide, fluoran compound (for example, 2 -Chloro-3-methyl-6- (4'-dibutylamino) phenylaminofluorane [Nippon Soda, product name PSD-850 (colorless ← → dark green), 2-chloro-3-methyl-6- [4 '-Phenylamino- (4'
'-Phenylamino)] phenylaminofluorane [manufactured by Nippon Soda Co., Ltd., product name PSD-802 (colorless ← → dark purple).

(B) The compound having an electron accepting property with respect to the organic compound is a compound having a phenolic hydroxyl group, a metal salt thereof, an aromatic carboxylic acid, and an aliphatic carboxylic acid having 2 to 5 carbon atoms and their Metal salts, acidic phosphoric acid esters and metal salts thereof, 1,2,3-triazole and derivatives thereof, heterocyclic compounds (triazole compounds having a hydroxyl group at the 1-position or 3-position), halohydrins having 2 to 5 carbon atoms and the like Derivatives, urea and thiourea and their derivatives, guanidine and its derivatives, boric acid and boric acid esters and their metal salts, pyrrole, pyrazole and their derivatives, oxazole and thiazole derivatives, aromatic carboxylic anhydrides, aromatic monocarboxylic acids Acid-
Aromatic monocarboxylic acid mixed acid anhydride, total carbon number 4 to 6
And aliphatic carboxylic acid anhydrides and cycloolefin dicarboxylic acid anhydrides thereof.

The component (c), which is a medium that acts to reversibly cause the electron transfer reaction of the components (a) and (b) in a specific temperature range, will be described. Specifically, decyl alcohol, lauryl alcohol, myristyl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, oleyl alcohol, isostearyl alcohol, alcohols such as hexamethylene diol,
Heptyl laurate, stearyl myristate, propyl palmitate, butyl stearate, lauryl benzoate, esters such as dicetyl adipate, lauric acid,
Aliphatic carboxylic acids having 6 or more carbon atoms such as myristic acid, palmitic acid and adipic acid, and their anhydrides, ethers such as didecyl ether and didodecyl ether, ketones such as laurone, diheptyl ketone, stearone and benzophenone Boiling point of acid amides such as compounds, stearic acid amide, lauric acid amide, bisstearic acid amide, etc. 1
Examples thereof include compounds at 50 ° C. or higher, thiols, sulfides, disulfides, aromatic azomethines, aliphatic aldehydes having 7 or more carbon atoms, aromatic aldehydes, nitrile compounds, oximes and their derivatives.

The above-mentioned three components are component (a): component (b):
Weight ratio of component (c) 1: 0.1 to 10: 1 to 100
To obtain a thermoreversible near-infrared absorbing composition that reversibly absorbs wavelengths in the near-infrared region due to temperature change, by mixing at a ratio of 80 ° C. and melting at 80 ° C. to 100 ° C. to form a homogeneous compatible solution. You can In order to eliminate the problem that its properties are impaired when it comes into contact with other substances such as a strongly acidic substance that causes an irreversible reaction with component (a) or a substance that interferes with the reaction between components (a) and (b), The problem is solved by forming a microcapsule having a particle size of 1 to about 30 μm, which encloses the composition by a well-known microencapsulation method, and at the same time, two or more different near infrared absorptions in the same system. A composition exhibiting characteristics can coexist.

[0009]

Example 1 A thermoreversible near-infrared absorbing composition comprising 3 parts of PSD-850 (manufactured by Nippon Soda Co., Ltd., fluoran leuco dye), 6 parts of bisphenol A, 25 parts of myristyl alcohol, and 25 parts of decyl myristate (this composition) The substance changed to dark green at about 15 ° C or lower, and changed to colorless at about 15 ° C or higher) by a known method. The obtained microcapsules were mixed with an acrylic emulsion type resin, and the white cloth surface was coated to give 20 g / m ^{2 of} microcapsules to obtain a reversible color-changing endothermic cloth (at room temperature, in a reflection spectrum (No visible absorption in the near infrared region)

[0010]

Example 2 Myristyl alcohol used in Example 1, and cell alcohol 5 instead of decyl myristate
A reversible thermochromic fabric was similarly obtained by using 0 part. The cloth had a color change similar to that of Example 1 at a temperature of about 40 ° C. (at room temperature, it has absorptivity in visible and near-infrared portions).

[0011]

Comparative Example 1 In place of the PSD-850 used in Example 1, 3 parts of ODB-2 (a fluoran leuco dye manufactured by Yamamoto Chemical Co., Ltd.) was used to obtain a reversible discolorable cloth in the same manner. The obtained fabric had a black color change on the low temperature side and a colorless color change on the high temperature side at about 15 ° C. (At room temperature, there is no absorption in the visible and near infrared).

[0012]

Comparative Example 2 In place of PSD-850 used in Example 2, 3 parts of ODB-2 was used to obtain a reversibly discolorable cloth in the same manner. The obtained fabric showed the same color change as in Comparative Example 1 at a boundary of about 40 ° C. There is absorption in the visible region at room temperature, but no absorption in the near infrared region.

[0013]

[Example 3] Green 118 (Yamamoto Chemical Co., Ltd., electron donating infrared absorbing organic compound) 3 parts, bisphenol A6
Part, 25 parts of Conol 1495, and 25 parts of Engerb DM (manufactured by Shin Nippon Rika Co., Ltd., decyl myristate) were microencapsulated by a conventional method to obtain a thermochromic pigment (this pigment is about 15 ° C. Blue-green, colorless at 15 ° C or higher). 20 parts of the microcapsule pigment and 80 parts of an acrylic ester resin emulsion were mixed and uniformly applied to a cloth to obtain a thermochromic endothermic cloth. A cloth obtained in the same manner using the cloth and the microcapsule pigment obtained in the comparative example was exposed to sunlight at 10 ° C. in the open air (the cloths of Example 1, Example 3 and Comparative Example 1 were all colored). As a result of exposing and measuring the surface temperature, the surface temperatures of the fabrics of Examples 1 and 3 became high. However, when the surface temperature was measured when the outside air temperature was 20 ° C. (all of the above cloths were decolored), almost no difference was observed. The cloths obtained in the above Examples and Comparative Examples were exposed in an environment of 21 to 22 ° C. with a 60W round incandescent light bulb, the distance between the light bulb and the cloth surface was set to 15 cm, and exposed for 20 minutes, during which The back surface temperature of the fabric (maximum temperature reached) was measured with a temperature sensor.

[0014]

[Table 1]

As shown in Example 2 in Table 1, it has a near-infrared absorbing ability and has a large endothermic effect in the colored state as compared with the other cases. Further, as seen in Examples 1 and 2, also in the systems having the near-red recording absorptivity, there is a difference in the endothermic property in the colorless state and the colored state.

[0016]

EFFECTS OF THE INVENTION The fabric of the present invention discolors (colors) in a specific temperature range (relatively low temperature range) and effectively absorbs wavelengths in the near-infrared region in the colored state as seen in the above Examples. A heat-absorbing cloth can be provided, and the cloth can be applied to sports clothes, leisure clothes, winter clothes and the like as a garment that gives a feeling of warmth.

Claims (1)

Claims: (a) an electron-donating near-infrared absorbing organic compound, (b) a compound that is electron-accepting to the organic compound, (c) the (i), ( (B) Microcapsules containing a thermoreversible near-infrared absorbing composition comprising a compatible solution containing a compound, which is a reaction medium that reversibly causes an electron transfer reaction by the component in a specific temperature range, as an essential component.
A reversible color-changing endothermic fabric having a coating layer, which is dispersed in a synthetic resin in an amount of -40 to 60 parts by weight, on a front surface or a back surface of the cloth.