JPH11217770A - Heat retaining fabric and composition for imparting heat retaining property - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fabric excellent in heat retaining properties without any change in touch by applying a composition for imparting the heat retaining properties prepared by compounding a binder resin with specific hollow fine particles and an infrared ray absorber to a fabric. SOLUTION: This composition for imparting heat retaining properties is prepared by compounding 100 pts.wt. (solid content) of a binder resin such as a urethane-based resin with 1-2,000 pts.wt. of at least one kind of hollow fine particles selected from the group of a styrene based resin, an acrylic resin and/or a copolymer thereof and having <=1.0 μm diameter and >=25 vol.% hollow volume percentage and 1-200 pts.wt. of at least one kind of an infrared ray absorber selected from the group of a metal oxide-based fine particle such as an antimony-doped tin oxide and a carbon black or an infrared ray absorbing coloring matter. A fabric is then coated with the composition for imparting the heat retaining properties with a gravure roll, etc., to apply 1-30 g of the hollow fine particles and 0.01-10 g of the infrared ray absorber based on 1 m<2> fabric thereto. Thereby, the heat retaining fabric is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-retaining fabric and a heat-retaining composition used for producing the fabric. More specifically, the present invention relates to a heat-retaining fabric that can be used for clothing, interiors, other fiber materials, and the like for which heat retention is desired, and a heat-retaining composition used for producing the fabric.

[0002]

2. Description of the Related Art Various methods for producing a heat-retaining fabric have been proposed so far, but all have various problems as described below. One method is to attach a material that absorbs infrared rays from sunlight or the like to the fabric to enhance heat retention. Specifically, it is a method of kneading or applying an infrared absorbing material such as carbon black or a colored metal carbide, for example, zirconium carbide, to the fiber. However, the heat retaining fabric produced by this method is only warmer than the unprocessed fabric only when there is sunlight, and it is natural that it is warm when there is sunlight, and it is intentionally heat retaining. It is not practical because it is not necessary.

Next, a method of microencapsulating a phase change material such as paraffin and fixing the same to a cloth with a resin binder to exert a heat retaining effect (Japanese Patent Application Publication No. 5-156570)
There is. The phase change material absorbs heat when melting, lowers the ambient temperature, and generates heat when solidified. This method utilizes this principle. However, the heat-retaining fabric produced by this method requires a large amount of heat because the phase-change material has a small endothermic capacity and a small heat-generating capacity, so that the fabric has a hard feel and lowers its commercial value.

[0004] Further, there is a method of preventing heat loss due to convection of air by forming dead air in the fabric and improving heat retention. Specifically, there are a method of forming dead air by raising and raising hair, such as a blanket, and a method of forming a dead air layer using hollow fibers. The method that can surely exhibit the heat retaining effect is a method using dead air. However, this method has a problem that, in many cases, it is difficult to make a raised or raised state due to the characteristics of the material and use of the fabric, and the type of fabric that can form dead air is considerably limited. The method using hollow fibers requires product design from the yarn manufacturing stage, increases the manufacturing cost, is complicated in processing, and is not versatile.

[0005] As a method of forming dead air which is performed in fields other than the field of fibers, there is a method using a urethane foam material or the like. Creating dead air with a foamed structure is effective for imparting heat retention. The foaming method uses a chemical foaming agent that decomposes by heat, the method that uses carbon dioxide gas generated during the urethane reaction, the method that uses volatile gases such as freon gas, and the method that uses microcapsules that expand thermally. It has been known. However, in the method using the urethane foam, there is a serious problem that when the urethane foam is laminated on the fabric, the thickness is extremely increased, and there is also a problem that the original appearance and feel of the fabric are changed. That is, the cloth has substantial restrictions on the appearance, thickness, touch, and the like, for example, in taffeta lining, shirting, blouse, and the like, depending on the use and purpose of use. Therefore, it is necessary to obtain a heat-retaining fabric without substantially changing the appearance, thickness, feel, and the like of the unfinished fabric. This method also has a problem that the operation is complicated.

A method of kneading infrared radiation ceramic into fibers has been proposed (Japanese Patent Application Laid-Open No. 9-5982).
It is questionable whether infrared radiation and effects work at low temperatures close to body temperature. In addition, the thermal insulation effect of the method using the infrared absorbing material described above can be confirmed with an infrared radiation thermometer, and the thermal insulation effect of the method using the phase change material can be confirmed with a differential calorimeter. The heat retention effect of the method using infrared radiation ceramic can be easily confirmed with a color photograph (thermograph) using a measuring device such as Thermolab II manufactured by Kato Tech Co., Ltd. The effect is difficult to demonstrate.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a versatile material capable of imparting heat retention to any kind of fabric, exhibit an excellent heat retention effect, and this heat retention effect is definitely demonstrated by a known measuring method. It is an object of the present invention to provide a highly practical heat insulating cloth that can be used. Another object of the present invention is to provide a heat retaining composition for easily obtaining such a heat retaining cloth.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a heat insulating cloth according to the present invention has a diameter of 1.0 mm in a cloth main body.
It is provided with hollow particles having a size of not more than μm. In order to solve the above-mentioned problems, the composition for imparting heat retention according to the present invention comprises a binder resin and hollow particles having a diameter of 1.0 μm or less and an infrared absorber.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a fabric body is
It refers to a fabric to which heat retention is to be imparted, and any type of fabric can be used as long as it is a fabric. The types of fibers constituting the fabric body include synthetic fibers such as polyester and nylon, regenerated fibers such as rayon, natural fibers such as cotton, wool, and silk, and composites thereof, and are particularly limited. Not something. Examples of the form include a woven fabric, a knitted fabric, and a nonwoven fabric, and there is no limitation on the thickness, the basis weight, the appearance, and the like of the fabric.

The hollow particles used in the present invention have a diameter of 1.
It has a diameter of 0 μm or less, and preferably has a diameter of about 0.5 μm. The hollow fine particles of this size are sufficiently small compared to the circumference of the fiber constituting the fabric main body of several tens of microns, and even if this is adhered to the fabric, the appearance, thickness, and touch inherent in the main body of the fabric are almost zero. Without changing, the fabric body can be provided with heat retention.

Hollow particles generally have the property of scattering light due to the difference in the refractive index between the internal pores and the air / polymer interface of the shell to increase whiteness and opacity, and have a shielding white color. Although it is a pigment, there is no problem in attaching it to the fabric body. The hollow particles are not particularly limited, but those made of a styrene resin, an acrylic resin, and / or a copolymer resin thereof are preferably used. Specifically, styrene-based resins such as polystyrene and poly-α-methylstyrene, and acrylic-based resins such as polymethyl methacrylate, polyethyl methacrylate, polyisopropyl methacrylate, polyisobutyl methacrylate, polyacrylonitrile, and polymethacrylonitrile Other than resins, polyvinyl chloride, polytetrafluoroethylene, polyvinyl alcohol, poly-o-vinylbenzyl alcohol, poly-m-vinylbenzyl alcohol, poly-p-vinylbenzyl alcohol, polyvinyl formal, polyvinyl acetal, polyvinyl propional, Polyvinyl butyral, polyvinyl isobutyral, polyvinyl-tert-butyl ether, polyvinyl pyrrolidone, polyvinyl carbazole, cellulose acetate, polycarbonate, and further Such as those of the copolymer, and the like.

The hollow particles having a hollow volume ratio of 25% by volume or more are preferably used, and have a structure having a large number of fine pores, a single shell layer, or a multi-shell layer. And so on. The hollow volume ratio refers to the ratio of the volume of the hollow portion to the particle volume. As described in JP-A-56-32513, the volume of the hollow portion can be measured by immersing the hollow particles in a hydrocarbon oil (n _D 1.51) and then observing the particles with an optical microscope.

The hollow particles can be obtained in an aqueous dispersion state or in a dry powder form. When the heat insulating fabric is produced using a solvent-based compounding composition, crosslinked hollow particles are preferably used in order to impart insolubility to a solvent. In the present invention, in order to improve the heat retaining property, it is preferable to attach an infrared absorbing agent to the cloth body in addition to the hollow particles having a diameter of 1 μm or less. When an infrared absorber is used in combination with the hollow particles, the heat retention effect is improved far more than expected, compared to a case in which only an infrared absorber is applied to a fabric. That is,
In addition to absorbing relatively strong infrared rays such as sunlight and maintaining the temperature of the fabric whose temperature has risen, in addition to the infrared absorber alone, the release of energy could not be confirmed because it was weak. Infrared rays can also be stored, and the heat retention can be dramatically improved.

The infrared absorber is not particularly limited, but metal oxide fine particles, carbon black, an infrared absorbing dye of an organic compound, and the like can be used.
Among the infrared absorbers, particularly, metal oxide-based fine particles often have both infrared absorption performance and infrared reflection performance, and are preferably used. Specifically, antimony-doped tin oxide (ATO) and tin-doped indium oxide (ITO)
Metal oxide-based fine particles of 100 nm or less such as TO) are preferably used. Such metal oxide-based fine particles,
It is also a transparent material that transmits visible light, and is also preferable in that it does not change the hue of the fabric body. Such metal oxide-based fine particles can be obtained as an aqueous dispersion or a solvent-based dispersion such as toluene. Carbon black, which is generally used as a black pigment, is also an effective infrared absorber, and can be used not only for coating but also for kneading fibers to improve heat retention. The particle diameter of the carbon black is not particularly limited, but may be any particle diameter of about several μm used for a black pigment or the like. Carbon black is
It is preferably used when the hue of the fabric is a dark color product such as black, navy blue or orange. When carbon black is applied to a light-colored thin fabric body, the color of the fabric body tends to be gray.

The amount of the hollow particles and the infrared absorbing agent applied to the main body of the fabric is preferably 1 g or more and 30 g or less, more preferably 1 g or more and 10 g or less per square meter of the fabric. The amount of the infrared absorber is preferably 0.01 g or more and 10 g or less per square meter. When carbon black is used as an infrared absorbing agent, the amount is preferably 0.1 g or more and 10 g or less per square meter.

In the present invention, the hollow particles and the infrared absorber are mixed with a urethane resin, an acrylic resin, a polyester resin,
It is added to a binder resin such as a silicone resin, a vinyl chloride resin, or a nylon resin and used to give the cloth.
The type of the binder resin is not particularly limited. The amount of the binder resin applied is 1 based on the resin solid content.
It is preferable that the amount be 0.1 g or more and 30 g or less per square meter. This blended composition may be composed of either an aqueous system or a solvent system. However, considering the composition of available materials, an aqueous system is easier to compose. As the solvent, toluene, isopropyl alcohol, dimethylformamide,
Methyl ethyl ketone, ethyl acetate and the like are preferably used. In this composition, melamine, isocyanate yarn,
A crosslinking agent such as an epoxy type may be used in combination.

The composition for imparting heat retention according to the present invention refers to the above-mentioned composition obtained by mixing hollow particles and an infrared absorber in the binder resin. An appropriate additive may be further compounded for the purpose of improving the adhesion to the fabric body. The compounding amount of the hollow particles and the infrared absorber is, for example, 1 to 100 parts by weight of the solid content of the binder resin and the hollow particles 1 to
2000 parts by weight and 1 to 200 parts by weight of the infrared absorbent.

As a means for applying the resin composition to the cloth body, any known applying means such as a method of squeezing with a mangle roll after padding, a gravure coating method, a knife coating method, a kiss roll method, and a screen printing method can be applied. What is necessary is just to select according to the target adhesion amount and adhesion state. When the infrared absorbent is applied to the fabric in addition to the hollow fine particles, the infrared absorbent is applied after the hollow particles are applied to the fabric, or the reverse order is applied, or the hollow particles are formed using the heat retaining composition. For example, fine particles and an infrared absorber are simultaneously applied.

The hollow particles and the infrared absorbing agent may be applied to the main body of the fabric by a method such as kneading into fibers, and there is no particular limitation on the means of applying the hollow particles and the infrared absorbing agent.

[0020]

EXAMPLES The present invention will be specifically described below with reference to examples. (Example 1) A taffeta woven fabric (density: 76 × 90 fibers / inch) composed of 100% polyester was dispersed at a disperse dye Kayalon polyester yellow 4GE (manufactured by Nippon Kayaku Co., Ltd.) at 1% o.
w. f. At 130.degree. Then, after drying by a conventional method, the substrate was set at 160 ° C. for 30 seconds.

For the purpose of imparting heat retention, the following composition was prepared. Blended composition Impranyl DLN 6.0% (water-based urethane resin manufactured by Bayer AG, solid content 40%) Aqueous dispersion of acrylic / styrene copolymer fine particles 80.0% (hollow particle diameter 0.45 micron, hollow ratio 33) %, Solid content 40%) water 14.0% Then, 7 g / m ² was applied to one side of the woven fabric using a gravure roll of 125 mesh, and then dried at 120 ° C.
A heat insulating fabric was obtained.

When the heat retention rate and the infrared radiation temperature of the obtained heat insulating cloth and the untreated cloth were measured, the heat retention rate: Example 19%, untreated cloth 13% Infrared radiation temperature: Example 32.0 ° C. , Untreated cloth 32.0 ° C, and the heat retention was improved. The hue of the heat insulating cloth also hardly changed.

The measurement of the heat retention and the infrared radiation temperature as the measurement of the heat retention of the heat insulating cloth and the untreated cloth were carried out as follows. Measurement method of heat retention Measurement of Insulation Ratio Thermolab II manufactured by Kato Tech Co., Ltd. was used for the measurement.

A 15 × 15 cm measurement sample was placed on a hot plate at 36 ° C., and after placing the sample, the heat retention was calculated from the amount of power consumed to maintain the same temperature. 2. Measurement of infrared radiation temperature Infrared radiation temperature was measured to confirm heat storage.
A 250 W infrared lamp manufactured by Jeb Electric was used to irradiate the sample with infrared light, and a thermotracer 3102 manufactured by NEC Sanei Co., Ltd. was used to measure the infrared radiation temperature distribution.

A sample of 15 × 15 cm was placed on styrofoam in an environment of a climate chamber at 20 ° C. and 65% RH.
Irradiation was performed using an infrared lamp. When the temperature around the sample reached 31 ° C., the infrared radiation temperature distribution on the sample surface was recorded as a color photograph with a temperature display and measured. For reference, a heat insulating cloth for comparison was obtained in the same manner as in Example 1 except that the hollow particles were removed from the heat insulating composition and carbon black was used. That is, a heat insulating cloth for comparison was obtained using the following composition.

Blended composition Impranyl DLN 6.0% (water-based urethane resin manufactured by Bayer AG, solid content 40%) Ryudai W Black RC 5.0% (carbon black, manufactured by Dainippon Ink, solid content 40%) Water 89 Measurement of the heat retention rate and the infrared radiation temperature of the obtained comparative heat insulating cloth and the untreated cloth were as follows. Heat retention rate: 9% for Comparative Example, 13% for untreated cloth Infrared radiation temperature: Comparative Example 37 0.2 ° C., untreated cloth 32.0 ° C., and it was confirmed that the infrared radiation temperature increased, but the heat retention rate was rather decreased. Moreover, the hue of the obtained fabric became gray. (Example 2) A taffeta woven fabric (density: 76 x 90 fibers / inch) composed of 100% polyester was used for 15% o. w. f. And dyed black at 130 ° C. Then, after reducing and washing by a conventional method, and drying,
Set at 30 ° C. for 30 seconds.

For the purpose of imparting heat retention, the following composition was prepared. Blended composition Impranyl DLN 6.0% (water-based urethane resin manufactured by Bayer AG, solid content 40%) Aqueous dispersion of acrylic / styrene copolymer fine particles 80.0% (hollow particle diameter 0.45 micron, hollow ratio 33) %, Solid content 40%) Ryudai W Black RC 5.0% (carbon black, manufactured by Dainippon Ink, solid content 40%) Water 9.0% Next, on one side of the fabric using a 125 mesh gravure roll After applying 7 g / m ^2, it was dried at 120 ° C.
A heat insulating fabric was obtained.

When the heat retention rate and the infrared radiation temperature of the obtained heat retaining cloth and the untreated cloth were measured, the heat retention rate: 19% in Example, 13% of untreated cloth Infrared radiation temperature: Example 37.2 ° C. The temperature of the untreated cloth was 32.0 ° C., and it was confirmed that the heat retention was improved by any method. (Example 3) Sumikaron Yellow E is a taffeta woven fabric (density: 76 × 90 / inch) made of 100% polyester.
-RPD (Sumitomo Chemical Co., Ltd.) 0.005% o.
w. f. With ivory. After washing with water and drying, 16
Set at 0 ° C. for 30 seconds.

The following composition was prepared for imparting heat retention. Blended composition Impranyl DLN 6.0% (water-based urethane resin manufactured by Bayer AG, solid content 40%) Aqueous dispersion of acrylic / styrene copolymer fine particles 80.0% (hollow particle diameter 0.45 micron, hollow ratio 33) %, Solid content 40%) ATO Argentine particle ice dispersion (metal oxide fine particle diameter 50 nm or less, solid content 15%) 10.0% water 4.0% Next, woven fabric using 125 mesh gravure roll After applying 7 g / m ^{2 on} one side of
A heat insulating fabric was obtained.

Measurement of the heat retention rate and the infrared radiation temperature of the obtained heat-retaining cloth and the untreated cloth were carried out. The heat retention rate: Example 19%, untreated cloth 13% Infrared radiation temperature: Example 34. The temperature was 5 ° C. and the untreated cloth was 32.0 ° C., and it was confirmed that the heat retention was improved by any of the methods. (Example 4) A basis weight 100 composed of 100% polyester
A g / m ² spun woven fabric which was subjected to fluorescent whitening by a conventional method was used for the test.

For the purpose of imparting heat retention, the following composition was prepared. Compounding composition EX628 7.0% (water-based acrylic resin manufactured by Shin-Nakamura Chemical Co., solid content 40%) Aqueous dispersion of acrylic / styrene copolymer fine particles 85.0% (hollow particle diameter 0.45 micron, hollow ratio 50%) , Solid content 40%) ATO aqueous dispersion (metal oxide fine particle diameter 50 nm or less, solid content 15%) 8.0% Next, 7 g / m ^{2 is} applied to one surface of the fabric using a 125 mesh gravure roll. After drying at 120 ℃
A heat insulating fabric was obtained.

When the heat retention rate and the infrared radiation temperature of the obtained heat retaining cloth and the untreated cloth were measured, the heat retention rate: Example 22%, untreated cloth 15% Infrared radiation temperature: Example 37.3 ° C. The untreated cloth was 33.5 ° C., and it was confirmed that the heat retention was improved by any of the methods. (Example 5) A basis weight 100 composed of 100% polyester
A g / m ² woven fabric obtained by fluorescent whitening by a conventional method was used for the test.

For the purpose of imparting heat retention, the following composition was prepared. Chris Coat AC80 70.0% (Dai Nippon Ink's solvent-based acrylic resin, solid content 20%) Acrylic / styrene copolymer fine particle powder 15.0% (hollow particle diameter 0.5 micron, hollow ratio 33%) ATO fine particles Toluene dispersion 5.0% (Metal oxide based fine particle diameter 50 nm or less, solid content 55%) Coronate HL 1.0% (Nippon Polyurethane, polyisocyanate) Toluene 5.0% On one side of the fabric by knife coating method 20g / m
^{After 2} coatings, drying was performed at 120 ° C., and the measurement of the heat retention rate and the infrared radiation temperature of the obtained heat-retaining cloth and untreated cloth were carried out. Heat retention rate: Example 20%, untreated cloth 15% Infrared radiation temperature: Example 36.5 ° C., untreated cloth 33.5 ° C., and improvement in heat retention was confirmed by any of the methods.

[0034]

The heat-retaining fabric according to the present invention can be applied to any kind of fabric because the thickness, basis weight and appearance of the fabric are not limited. This heat-retaining fabric has almost no change in appearance, thickness, and feel compared to the fabric body before processing, and thus has no limitation in application and is excellent in versatility. Since this heat-retaining fabric is also excellent in heat retention, if it is used for clothing for cold weather protection, heat-retention covers, curtains, and the like, it provides a comfortable environment and contributes to energy saving.

The heat insulating effect of the heat insulating cloth according to the present invention is as follows:
For example, in the measurement of the heat retention rate by Thermolab II of Kato Tech Co., Ltd., it can be confirmed that the numerical value is increased and the heat retention is increased as compared with the untreated cloth. In addition, by giving a certain amount of heat to the measurement data, measuring the temperature with an infrared radiation thermometer, and obtaining a color photograph of the temperature distribution, the temperature is higher than that of the untreated cloth, and that the material has heat storage properties. You can check. As described above, the heat-retaining fiber fabric of the present invention is a highly practical fiber fabric whose effect can be demonstrated as a difference in numerical values from the comparative fabric.

The composition for imparting heat retention according to the present invention can easily obtain the cloth for heat retention according to the present invention.

Claims (7)

[Claims] 1. A heat-retaining fabric obtained by providing hollow particles having a diameter of 1.0 μm or less to a fabric main body. 2. The heat-retaining fabric according to claim 1, wherein the amount of the hollow particles applied is 1 to 30 g per square meter to the fabric body. 3. The heat insulating fabric according to claim 1, wherein the hollow particles are at least one selected from a styrene resin, an acrylic resin, and a copolymer resin thereof. 4. The heat insulating fabric according to claim 1, further comprising an infrared absorbing agent. 5. The heat-retaining fabric according to claim 4, wherein the infrared absorbent is at least one selected from metal oxide fine particles, carbon black, and an infrared absorbing dye. 6. The heat-retaining fabric according to claim 4, wherein the infrared absorbent is a substance having both infrared absorption performance and infrared reflection performance. 7. A composition for imparting heat retention, comprising a binder resin and hollow particles having a diameter of 1.0 μm or less and an infrared absorber.