JP2005307381A - Heat storage material for clothing material and microcapsule for clothing material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a heat storage material which keeps a temperature in the range of comfortableness without abruptly changing a temperature in clothing by wearing a clothing material to which the heat storage material is fixed even when a wearer moves from a temperature to be regarded as a comfortable environmental temperature to a high-temperature or low-temperature atmosphere and which has extremely excellent temperature stability not to be affected by the season and individual difference and to obtain a clothing material. <P>SOLUTION: The heat storage material for clothing material is constituted of at least three or more kinds of compounds among 16-21C straight-chain aliphatic hydrocarbon compounds and has ≥84 kJ/kg melting calorie. The heat storage material has preferably ≥60% total mass ratio of 17-20C straight-chain aliphatic hydrocarbon compounds in the total heat storage material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heat storage material in which warmth, coolness, and comfort last for a long time by applying, impregnating, and adhering the heat storage material of the present invention to clothing materials such as clothes, gloves, and socks.

  The following examples are known as techniques and clothing materials for bringing a thermal storage function by attaching a heat storage material to a support such as a fiber or a sheet. A fiber structure having heat storage properties obtained by fixing paraffin-encapsulated microcapsules to a fiber structure using a resin binder. (For example, patent document 1) The fiber which shows reversible heat | fever storage property which shows thermal stability, when a microcapsule is disperse | distributed to the fiber base material and the said base material, and this microcapsule is heated or cooled. (For example, patent document 2) The composite fiber which a sheath part consists of a thermoplastic polymer, and a core part consists of a latent heat storage material. (For example, Patent Document 3)

  In addition, for the purpose of preventing the heat generated from the human body from being stored or dissipated, proposals have been made for fabrics in which microcapsules containing a heat storage material are coated or impregnated in the fibers themselves, but are retained. Since the weight of the heat storage material is extremely small, the comfort does not last long and it is not sufficient in terms of texture and comfort. (For example, Patent Documents 4, 5, and 6)

In general, the heat storage materials used in these materials are latent heat storage materials that use the heat energy that enters and exits when the substance undergoes a phase change. As a specific example, normal paraffin has a high heat of fusion and safety. It is used a lot. In addition to normal paraffin, compounds such as alcohol, fatty acid, ester, etc. may be mentioned, but these compounds are preferably used in a composition as close to a unit as possible, that is, a composition close to a pure product, so as not to cause a decrease in heat storage capacity. It is known from experience. Mixing and using a variety of heat storage materials widens the temperature distribution range during melting or solidification, and shows a significant decrease in the amount of heat of fusion. Was not the preferred method for all industrial applications dealing with
JP-A-5-156570 Japanese Patent Publication No. 5-55607 JP-A-6-200417 JP-A 64-85374 JP-A-9-78470 JP-A-10-295407

  The problem of the present invention is that even when the environment temperature is moved to a temperature higher or lower than a comfortable temperature, by wearing the clothing material in which the heat storage material of the present invention is fixed, the temperature in the clothes is The object is to provide a heat storage material composition and a clothing material that are maintained at a comfortable temperature without changing suddenly for a long period of time and that are extremely unaffected by seasonal and individual differences and that have excellent temperature stability.

  The subject of the present invention is a heat storage material composed of at least three kinds of straight-chain aliphatic hydrocarbon compounds having 16 to 21 carbon atoms as the heat storage material composition and having a heat of fusion of 84 kJ / kg or more. Is achieved by using as a material for clothing.

  The effect of the present invention is that the time when the heat storage material of the present invention is used as a clothing material is warm, cool and comfortable. Furthermore, it is seen that a clothing material having a temperature control function that is hardly affected by the season and individual differences can be obtained by dressing the heat storage material of the present invention processed as a clothing material using an immobilizing means such as a microcapsule. It was issued.

   The present inventor has found that when the environmental temperature in the garment deviates significantly from the range of about 25 to 35 ° C., the discomfort of suddenly becoming cold or hot becomes remarkable, and in order to stabilize the garment in this garment temperature range for a long time. It is effective to dare to mix three or more kinds of heat storage materials from among the aliphatic hydrocarbon compounds having the above-mentioned carbon number, and the most comfortable feeling is achieved especially when the temperature in the clothes is maintained in the range of 28 to 32 ° C. Was found to be felt. It has also been found that in order to maintain this temperature range for a long time, it can be achieved remarkably by setting the total mass ratio of straight chain aliphatic hydrocarbon compounds having 17 to 20 carbon atoms to 60% or more. A mass ratio of 60% or less is not preferable because it tends to deviate from the preferable temperature range in clothes. However, it has also been found that the object of the present invention cannot be sufficiently achieved if the heat of fusion is less than 84 kJ / kg even in the combination of the above setting ranges.

  Since the heat storage material of the present invention is solid below its melting point and behaves as a liquid above the melting point, it needs some immobilization treatment so that it does not leak out during melting in order to be used as a clothing material. Specific methods include a method of impregnating an oil-absorbing polymer material and treating it as a gel state, a method of using an oil-absorbing inorganic pigment, a method of impregnating between layers or sheath portions of multilayer structure fibers, and the like. The method of encapsulating in a microcapsule is the most preferable method in terms of safety because the heat storage material does not leak out.

  As a method for microencapsulating the heat storage material, an encapsulation method by a composite emulsion method (Japanese Patent Laid-Open No. 62-1452), a method of spraying a thermoplastic resin on the surface of the heat storage material particles (JP-A 62-45680) , A method of forming a thermoplastic resin in the liquid on the surface of the heat storage material particles (JP-A 62-149334), a method of polymerizing and coating the monomer on the surface of the heat storage material particles (JP-A 62-225241), interfacial weight A method described in a method for producing a polyamide-coated microcapsule by a condensation reaction (Japanese Patent Laid-Open No. 2-258052) or the like can be used.

  The capsule membrane material is not particularly limited, but can be obtained by techniques such as interfacial polymerization method, in situ method, polystyrene, polyacrylonitrile, polyamide, polyacrylamide, ethyl cellulose, polyurethane, aminoplast resin, gelatin and carboxymethyl cellulose or gum arabic. A synthetic or natural resin using the coacervation method is used, but it is physically and chemically stable, and in-situ urea formalin can be obtained with good quality microcapsules even with aliphatic hydrocarbon compounds A microcapsule using a resin or a melamine formalin resin film is particularly preferred. The pH of the microcapsule dispersion is not particularly limited, but is preferably 10 or less.

  The microcapsule particle size is set by the type of emulsifier, the concentration of the surfactant, the temperature of the emulsified liquid during emulsification, the emulsification ratio (volume ratio of the water phase to the oil phase), and the atomizers such as emulsifiers and dispersers. The desired value can be set by changing the type and operating conditions (such as the number of rotations of stirring, time, etc.), but it is preferably set in the range of 1 to 10 μm so that the microcapsules are hardly destroyed. The particle diameter of the present invention indicates a volume average particle diameter measured using a Beckman Coulter Coalter Counter, Multisizer.

  The heat storage material of the present invention is coated or impregnated on the support base for clothing material after the fixing treatment. Specific examples of the supporting substrate include cotton, hemp (flax, ramie), silk, wool and other fibers, rayon as recycled fiber, cupra, acetate as semi-synthetic fiber, triacetate, promix, nylon as synthetic fiber Fibers such as acrylic, vinylon, vinylidene, polyester, polyethylene, polypropylene, and phenol are used and can be blended as necessary.

Specific examples of the coating or impregnation apparatus include an air knife coater, a blade knife coater, a nip coater, a gravure coater, a spray coater, and a curtain coater. The adhesion amount of the heat storage material is adjusted by the concentration of the coating agent, the viscosity, the coating speed, and the affinity with the support substrate, but when using the microcapsule that is a preferred immobilization method of the heat storage material of the present invention. the per unit area of the supporting substrate, 1~100g / m ^2, preferably coated in the range of 3 to 30 g / m ^2, it is sprayed or impregnated. If it is below this range, the heat storage performance is poor, and if it is above this range, the rigidity becomes strong and adversely affects the texture. It is also possible to add organic and inorganic pigments at the same time, specifically activated carbon, titanium oxide, dyes, coloring pigments, infrared absorbing pigments, hollow particles, magnetic powder, diatomaceous earth, aroma components, antibacterial agents, antifungals An agent or the like can be added.

  When the heat storage material of the present invention is coated or impregnated on the support base material, various binders can be added. Preferred binders include, for example, acrylic latex, vinyl acetate latex, urethane latex, epoxy latex, polyester latex, SBR latex, NBR latex, epoxy binder, phenolic binder, PVA, and starch. Or used in combination.

  Specific examples according to the present invention are shown below.

  Examples of the present invention are shown below. The number of parts in the examples represents solid mass parts. The melting point and heat of fusion were measured using a differential calorimeter (DSC-7, manufactured by Perkin Elmer, USA).

Example 1
As a heat storage material, a mixture of hexadecane (C16) 1%, heptadecane (C17) 14%, octadecane (C18) 82%, nonadecane (C19) 2%, eicosane (C20) 1% (melting point 25 ° C., heat of fusion 193 kJ / kg) ) To obtain a heat storage material for clothing materials.

Preparation method of microcapsule 15.4 parts by weight of 37% formaldehyde aqueous solution and 40 parts by weight of water were added to 12 parts by weight of melamine powder, and the pH was adjusted to 8, followed by heating to about 70 ° C. and aqueous solution of melamine-formaldehyde initial condensate. Got. 70 parts by weight of a heat storage material having the above composition was added to 100 parts by weight of an aqueous sodium salt solution of a 10% styrene-maleic anhydride copolymer adjusted to pH 4.5 with vigorous stirring, so that the particle size became 3.0 μm. Emulsification was carried out until After adding the total amount of the melamine-formaldehyde initial condensate aqueous solution to the obtained emulsion and stirring at 70 ° C. for 2 hours, the pH is raised to 9 and water is added to the heat storage material having a dry solid content concentration of 40%. A microcapsule dispersion was obtained.

The microcapsule dispersion is impregnated into a rayon fiber of 120 g / m ² using a nip coater so that the solid mass of the microcapsule is 12 g / m ² , and dried to be processed into a heat-resisting clothing material. Sewed on adult underwear. After five adult men put on this underwear, and then put on a shirt and a thin gentleman's outerwear, sit down at 20 ° C and humidity of 55% for 30 minutes, then under the hot summer heat The temperature and humidity between the skin surface and the underwear surface after moving under the simulated atmosphere of 35 ° C. and humidity 75% were measured.

  As a result of the measurement, as a result of measurement using a similar garment in which no heat storage material was processed, the temperature in the garment exceeded about 33 ° C in a short time, and more than a majority was uncomfortable in about 6 minutes. I started feeling. However, as a result of wearing the clothes processed with the heat storage material microcapsules shown in Example 1 and performing the same measurement, after about 35 minutes, the majority feels uncomfortable, and clearly there is a difference in the time during which the comfort lasts. I found it to happen.

Example 2
Clothing comprising a mixture of 5% octadecane (C18), 64% nonadecane (C19), 23% eicosane (C20), 5% heneicosane (C21) as a heat storage material (melting point 30 ° C., heat of fusion 164 kJ / kg) A heat storage material for the material was obtained. Using this heat storage material, microencapsulation was performed in the same manner as in Example 1, and the same fiber was impregnated in the same manner to process an underwear for adults. 5 adult men wear this underwear, and then sit down at 33 ° C in a 55% humidity atmosphere for 30 minutes with a shirt and cold protection on it, and then 10 ° C imitating the outside temperature in winter The temperature and humidity between the skin surface and the underwear surface after moving in an atmosphere with a humidity of 40% were measured.

  As a result of measurement, as a result of measurement using a similar garment that does not process the heat storage material at all, the temperature in the garment falls below about 30 ° C in a short time, and the majority of people start to feel cold. It was about 15 minutes. However, as a result of wearing the clothes processed with the heat storage material microcapsule shown in Example 2 and performing the same measurement, the majority felt that it was cold after about 50 minutes, and clearly there was a difference in the time during which comfort was sustained in both cases. I found it to happen.

Comparative Example 1
As a heat storage material, a heat storage material for clothing materials (melting point 28 ° C., heat of fusion 230 kJ / kg) composed of two components of 1% heptadecane (C17) and 99% octadecane (C18) was obtained.
When this heat storage material was processed in the same manner as in Example 1 and the same evaluation was performed,
Although the heat of fusion of the heat storage material is much larger than that of the heat storage material of Example 1, the majority feels uncomfortable in about 20 minutes and the heat storage material composition of Example 1 may feel more comfortable. I understood.

Comparative Example 2
In addition to 12% heptadecane (C17), 80% octadecane (C18), 2% nonadecane (C19) as a heat storage material, a heat storage material mixture containing 6% isoparaffin and aromatic components (melting point 23 ° C., heat of fusion 71 kJ / kg) A heat storage material for clothing material was obtained. When this heat storage material was processed in the same manner as in Example 1 and the same evaluation was performed, the amount of heat of fusion of the heat storage material was so small that only the same effect as that of unprocessed clothes was obtained in the same clothing test. There was no cushioning effect on the temperature inside the clothes, and no comfort was felt.

  Using the heat storage material of the present invention, it can be applied not only to apparel but also to bedding, medical warming equipment, sports supporters, and the like. Also, as a building material that stabilizes the room temperature, it is possible to obtain a comfortable environment without using cooling or heating equipment, suppressing an abnormal rise in room temperature in summer and a drop in room temperature in the morning and evening in winter. It can also be used as an indoor material.

Claims (3)

  A heat storage material for clothing materials, which is composed of at least three kinds of compounds in a linear aliphatic hydrocarbon compound having 16 to 21 carbon atoms and has a heat of fusion of 84 kJ / kg or more.   The heat storage material for clothing materials according to claim 1, wherein the total mass ratio of the linear aliphatic hydrocarbon compound having 17 to 20 carbon atoms is 60% or more of the total heat storage material.   A microcapsule for clothing material containing the heat storage material for clothing material according to claim 1.