KR20110071356A - Cooling mat or cooling sheet - Google Patents

Abstract

PURPOSE: A cooling mat or a cooling sheet is provided to be semi-permanently reused without separate cooling and additional reactions. CONSTITUTION: A cooling mat or a cooling sheet comprises an external sheet(1), polymeric gel(2), and a waterproof film. The external sheet stores the polymeric gel. The polymeric gel is composed of two or more kinds of endothermic materials, polymer resin, and cross-linked agent of the polymer resin. The two or more kinds of endothermic materials are mixed at 1:1 weight ratio. The weight ratio of the endothermic material and polymer resin is 1:5-1:2. The external sheet and waterproof film is integrated or separated.

Description

Cooling mat or cooling sheet

The present invention relates to a cooling mat or a cooling sheet, wherein the endothermic material causing a predetermined endothermic reaction is mixed with two or more kinds in the same weight ratio to dissolve together with the polymer resin to form a polymer gel having flexibility and elasticity, and a separate cooling treatment. And it relates to a cooling mat that can maintain a constant temperature 18 ℃ to 26 ℃, preferably 20 ℃ to 23 ℃ semi-permanently without the addition of endothermic material.

In general, in order to cool the heat excessively received from the outside of the body in the summer when the temperature is high, or to reduce the fracture or swelling during exercise, or to lower the high heat of the body, the endothermic pack may be used for cold pack. An embodiment of an endothermic pack for endothermic action of the pack is described in Korean Patent Publication No. 10-2006-0079187 and look at the configuration of the cold pack of the embodiment as follows.

The cold pack comprises an enclosure, a powdered solute inside the enclosure, a liquid inside the enclosure, a membrane separating the powdered solute and the liquid, and when the membrane is ruptured, the liquid and the powdered solute are mixed to contain the enclosure. The endothermic reaction that absorbs the surrounding heat from inside occurs. This has the advantage of being easy to use, but can be used as a heat absorbing pack, but has the disadvantage of not being used repeatedly.

In addition, although the same solution is used, an endothermic pack that can be used repeatedly has been developed. The endothermic reaction does not occur only with the solute and the solvent by embedding the solution and the heating element in which the solute and the solvent are integrated inside the pack on the bag.

That is, in order to induce an endothermic reaction in the solution of the pack, the heating element is bent to absorb the heat while the solution undergoes a chemical reaction due to the bending force. The pack having the above structure has the advantage that it can be used repeatedly by dissolving the internal material of the pack into a liquid by applying heat above a predetermined temperature in order to reuse the heat generated while changing to a solid state.

Conventional cooling packs and the like are a cooling method using an endothermic reaction generated when these components are mixed using a material having a large heat storage capacity as a cooling material. These endothermic materials are generally spread in a cooling manner for the human body, food, and the like. However, this cooling method can be used only once by storing the endothermic material and the solvent in a separate bag or by being separated from each other and using the endothermic reaction according to the mixing of the two materials (Korean Patent No. 139054). Or, there is an inconvenience that must be cooled in a refrigerator or freezer before use.

Thus, the present invention by dissolving the endothermic material causing the endothermic reaction with the hydrophilic polymer resin to form a polymer gel containing the endothermic material so that the cooling performance is always maintained at a constant temperature 18 ℃ ~ 26 ℃ without any additional treatment before use It is an object of the present invention to provide a cooling mat that can maintain a constant temperature without leaking a solution.

The present invention has been made to solve the problems with one-time or temporary cooling function of the cold pack that causes the endothermic reaction in the prior art by trapping the endothermic material in the endothermic reaction in the polymer gel form to maintain a constant temperature It is an object of the present invention to provide a cooling mat that can be semi-permanently reused without cooling and addition reaction.

The present invention relates to a cooling sheet or a cooling mat that is reusable without any treatment and is configured to maintain a constant temperature of 18 ° C. to 26 ° C. at all times. The cooling mat according to the present invention has an endothermic reaction that causes an endothermic reaction in the skin and the skin. It consists of a polymer gel containing the substance.

As described below, when the crosslinking is carried out by adding urea and ammonium nitrate to the polyvinyl alcohol polymer resin of the present invention in the same weight ratio to form a crosslinked polymer gel, the endothermic material does not precipitate and is contained in the polymer gel. It can be used as cooling mat because it keeps 18 ℃ ~ 26 ℃ because of endothermic material. In particular, polymer gels containing endothermic materials are flexible and elastic, so there are no defects in shearing of gels.

Since the cooling mat according to the present invention has two or more kinds of endothermic substances causing endothermic reactions in the polymer gel, there is no flow of the reactants, there is no phenomenon such as water leakage, and a constant temperature can be maintained. do.

That is, the structure of the cooling mat of the present invention is composed of a polymer gel containing an endothermic material that causes an endothermic reaction by chemical action in the skin.

In addition, the present invention in order to maintain a constant temperature of the polymer gel in order to maintain a constant temperature, the weight ratio of two or more types of endothermic materials trapped in the polymer gel should be approximately 1: 1 to maintain a constant temperature as well as maintaining the polymer gel state It has been found that the performance as a cooling mat is excellently maintained for a long time.

Therefore, the cooling mat according to the present invention,

Outer sheet for storing the polymer gel;

A polymer gel comprising a crosslinking agent of at least two kinds of endothermic materials, a water-soluble polymer resin and a water-soluble polymer resin in the outer sheet; And

Includes a waterproof film,

The two or more kinds of endothermic materials are characterized in that the mixture in a weight ratio of 1: 1.

Each component is as follows.

The outer shell is made of fabric or non-woven fabric in the form of a natural or synthetic resin, and an absorbent in the form of a nonwoven fabric is required to prevent the polymer gel from being pulled to one side between the outer shell and the polymer gel. In addition, between the other polymer gel and the shell is characterized in that the waterproof film is formed to prevent the liquid material contained in the polymer gel to leak to the outside.

The endothermic material used in the present invention is a material causing an endothermic reaction in the polymer gel, for example, an inorganic salt; Inorganic ammonium salts such as ammonium nitrate, ammonium sulfate, acidic ammonium sulfate, ammonium phosphate, ammonium hydrogen phosphate, ammonium metavanadate, ammonium chloride, ammonium bromide, and ammonium iodide; Or alkali metal salts such as sodium nitrate and potassium nitrate; Metal nitrate salts; And two or more kinds of the group consisting of elements. Also preferably, the inorganic salt and urea are mixed in a weight ratio of about 1: 1. Ammonium nitrate, ammonium chloride, ammonium bromide, ammonium sulfate or urea is preferred, and particularly preferably ammonium nitrate and urea are mixed in the same weight ratio.

In the present invention, the crosslinking agent of the polymer resin includes, for example, aldehydes such as formaldehyde, acetaldehyde, glutaraldehyde, and acids such as sulfuric acid, hydrochloric acid, nitric acid and phosphoric acid, and further includes strontium hydroxide hydrate, Magnesium chloride hexahydrate, sodium tetraborate pentahydrate, sodium carbonate pentahydrate, sodium carbonate pentahydrate, sodium sulfate pentahydrate, sodium phosphate pentahydrate, and the like.

In the present invention, as the polymer resin including the endothermic material and forming the polymer gel to maintain the cooling performance, various superabsorbent materials, thickeners, and the like can be used. For example, starch, carboxy methyl cellulose, carboxy ethyl cellulose, alkyl Acids, gelatin, starch-acrylic acid graft copolymers, maleic acid copolymers, vinylacetate-acrylic acid ester copolymers, polyvinyl alcohol, polyacrylic acid, and the like, but are not limited thereto. Preferably, the polymer resin that can be used in the present invention is a hydrophilic polymer such as polyvinyl alcohol, polyacrylic acid or starch, particularly preferably polyvinyl alcohol.

In this invention, the ratio of each containing component is arbitrarily determined from a viewpoint of preventing melt | dissolution alteration, when the ambient temperature rises during the target cooling performance or storage. For example, the amount of the crosslinking agent of the polymer resin is 1: 0.01 to 1, preferably 1: 0.1 in the weight ratio of the polymer resin and the crosslinking agent.

It is the most stable composition that maintains gel state for a long time without crystallization when the weight ratio of urea and inorganic salt that is endothermic is about 1: 1.If urea weight is larger than inorganic salt, urea is precipitated and no gel In the case where the weight of the inorganic salt is greater, the inorganic salt crystals precipitate and interfere with the gel formation. When the weight ratio of the polymer resin and the endothermic material is 1: 5 to 1: 2, it shows a relatively stable composition.

The outer skin is non-permeable and a film or sheet is used that does not leak the internal components to the outside, the material is not particularly limited, for example, as the non-permeable film synthetic resin, for example polyethylene, polypropylene, nylon, polychloride Synthetic resin films such as vinyl, polyvinylidene chloride, polyisocyanate, and composite films thereof, or aluminum foil, aluminum laminated films and the like. Among these, synthetic resin films, such as polypropylene, polyester, nylon, and polyvinyl chloride, or a composite film thereof are preferable from the viewpoints of overlapping with a nonwoven fabric, ease of processing, cost, and ease of obtaining.

It is preferable to combine the nonwoven fabric so as to be superimposed on the non-breathable film or sheet of the present invention. By superimposing the nonwoven fabric, the texture is good and wetting does not occur during use, the surface is not cooled more than necessary, and a comfortable feeling of cooling can be obtained for a long time.

There is no particular limitation on the material of the nonwoven fabric, but for example, nonwoven fabric of synthetic resin fibers such as nylon, polyethylene, polypropylene, polyester, polyvinyl chloride, cotton, pulp fibers, hemp, wool, silk, rayon, and the like And nonwoven fabrics. Among them, nylon, polyethylene, polypropylene, rayon, and the like are preferable, and nylon nonwoven fabric is particularly preferable because of the goodness of the touch, the lagging property with the non-moisture-permeable film, the ease of processing, and the like.

Nonwoven fabrics can be bonded to a nonwoven fabric so as to be superimposed thereon, such as lamination by heat fusion or dry lamination by an adhesive, and the nonwoven fabric can be fixed or partially fixed to the film over the entire surface, but the nonwoven fabric has excellent touch. For the purpose of saving moisture and preventing moisture due to condensation, it is preferable to lightly fix it over the entire surface or to partially fix it in dots or lines.

It is preferable to further mix the colorant with at least one component contained in the polymer gel of the present invention. This makes it possible to accurately identify a state in which a plurality of components are mixed. In addition, a comfortable cooling feeling of the user can be obtained.

The colorant is blended with an inorganic salt or a crosslinking agent. When mix | blending a coloring agent with these both, the coloring agent of a different color is used. In addition, when water is contained, you may mix | blend a coloring agent with water.

As the colorant, various natural and synthetic colorants such as pigments, dyes, coloring food additives, and pH indicators can be used.

Details of the effects and the resulting effects, including the object and technical configuration of the present invention will be clearer with reference to the following examples, but the scope of the present invention is not limited to the following examples.

Example 1

In a 100 ml glass beaker, 10 g of PVA (Mw 89,000-120,000) and 50 g of urea were added to 40 g of water, and dissolved at 70 ° C. while stirring to mix well. The PVA polymer was completely dissolved and then slowly cooled to room temperature with stirring. 1 g of glutaraldehyde and 1 g of phosphoric acid, which are PVA crosslinking agents, were added thereto, followed by sufficiently stirring. The solution was left at room temperature for one day to form a polymer gel. The temperature of the polymer gel was measured and recorded. The polymer gel thus produced had flexibility and elasticity while including endothermic material.

Example 2

Instead of 50g of urea, which is an endothermic substance, only 12.5g of urea and 37.5g of ammonium nitrate were added thereto, and the formation and temperature change of the polymer gel were observed in the same manner as in Example 1.

Example 3

Instead of only 50g of urea, which is an endothermic material, 25g of urea and 25g of ammonium nitrate were added to each other, and the formation and temperature change of the polymer gel were observed in the same manner as in Example 1.

Example 4

Instead of 50g of urea, which is an endothermic material, only 37.5g of urea and 12.5g of ammonium nitrate were added thereto, and the formation and temperature change of the polymer gel were observed in the same manner as in Example 1.

Example 5

Instead of only 50g of urea, which is an endothermic substance, 50g of ammonium nitrate was added thereto, and the formation and temperature change of the polymer gel were observed in the same manner as in Example 1.

Example 6

Instead of only 50g of urea, which is an endothermic substance, only 12.5g of urea and 12.5g of ammonium nitrate were added thereto, and the formation and temperature change of the polymer gel were observed in the same manner as in Example 1.

Table 1. Formation and surface properties of polymer gel including endothermic materials

Example Polyvinyl alcohol
(g) Purified water
(g) Crosslinking agent
(1 wt% glutaraldehyde + 1 wt% phosphoric acid) Element
(g) Ammonium Nitrate
(g)  Formation of polymer gel and surface properties One 10 60 1g, 1g 50 0 Gel formation slows down, but after a day urea precipitates 2 10 60 1g, 1g 12.5 37.5 Gel formation is fast and ammonium nitrate precipitates after opaque gel formation 3 10 60 1g, 1g 25 25 Polymer gel formation 4 10 60 1g, 1g 37.5 12.5 Element precipitates 5 10 60 1g, 1g 0 50 Ammonium Nitrate Precipitation 6 10 60 1g, 1g 12.5 12.5 Polymer gel formation

Table 2. Polymer gel formation and temperature characteristics over time

Example 1 day 3 days 30 days Polymer gel status and temperature characteristics One 21 ℃ X X Urea precipitation does not form polymer gel 2 21 ℃ 21 ℃ X Ammonium nitrate precipitates no polymer gel 3 21 ℃ 21 ℃ 21 ℃ Polymer gel formation, poor ductility 4 21 ℃ 21 ℃ X No precipitation of polymer gel due to urea precipitation 5 21 ℃ X X Polymer gel is not formed due to excessive precipitation of ammonium nitrate 6 21 ℃ 21 ℃ 21 ℃ Polymer gel formation and ductility

Figure 1 shows the configuration of a cooling mat according to an aspect of the present invention, the mat contains a polymer gel (2) surrounded by a two-layer outer shell (1), the polymer gel (2) endothermic material (3) Is dispersed.

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Claims (8)

Outer sheet for storing the polymer gel; A polymer gel composed of at least two kinds of endothermic materials, a polymer resin and a crosslinking agent of the polymer resin; And A cooling mat comprising a waterproof film, wherein the cooling mat is always maintained at 18 ° C to 26 ° C without additional equipment and power. According to claim 1, wherein the two or more types of endothermic material is mixed in a weight ratio of 1: 1, the weight ratio of the polymer resin and the endothermic material is 1: 5 to 1: 2, characterized in that the outer sheet and waterproof Cooling mat, wherein the film is integral or separate. The cooling mat according to claim 1, wherein the endothermic material is in a state in which two or more species are mixed from a group consisting of urea, an inorganic salt, an inorganic ammonium salt, and an alkali metal salt. The cooling mat according to claim 3, wherein the endothermic material is in a state in which urea and ammonium nitrate are mixed in the same weight ratio. The polymer resin according to any one of claims 1 to 4, wherein the polymer resin is starch, carboxy methyl cellulose, carboxy ethyl cellulose, alkyl acid, gelatin, starch-acrylic acid graft copolymer, maleic acid copolymer, vinyl Cooling mat, selected from the group consisting of acetate-acrylic acid ester copolymers, polyvinyl alcohol and polyacrylic acid. The cooling mat according to claim 5, wherein the polymer resin is polyvinyl alcohol. The crosslinking agent according to any one of claims 1 to 4, wherein the crosslinking agent includes aldehydes and acids, strontium hydroxide hydrate, magnesium chloride hexahydrate, sodium tetraborate decahydrate, sodium carbonate decahydrate, sodium carbonate heptahydrate, sodium sulfate decahydrate. And sodium phosphate 12-hydrate. The cooling mat according to any one of claims 1 to 4, wherein the polymer resin further comprises water.

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