JPS62184167A - Cooling base material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a cooling material made of a polyolefin fiber nonwoven fabric that does not require particular energy, is simple, and has excellent durability.

[Conventional technology] Polyolefins are used as reinforcing materials for industrial materials, materials for synthetic paper,
It is used for applications such as oil-water separation materials. these are,
Due to the low price of polypropylene, all of them are used only for disposable purposes, and are useful as mats, films, and packaging films for automobile flooring, for example.

Conventionally, cooling has generally applied the principle of utilizing adiabatic expansion of Freon gas, as typified by electric refrigerators.

Such cooling products include ice bags filled with ice, water pillows filled with water, and starch paste sealed in a film bag that is cooled in a refrigerator or the like.

[Problems to be Solved by the Invention] However, these conventional technologies, such as ice packs, require ice and have a cooling capacity only for a short period of time until the ice melts, and water pillows cannot cool down to below the water temperature. If the starch paste is sealed in a film bag, it is necessary to cool it in a refrigerator or the like beforehand.

In view of the drawbacks of the prior art, the present invention skillfully utilizes the principle of nature (utilization of latent heat of vaporization of liquid) without using any special energy. In particular, it cools water or cools other substances.

According to the present invention, it is possible to provide a cooling material that is simple, durable, and economical.

(Means for solving the problems) In order to solve the problems, the present invention employs the following means.

(1) A cooling material that is a non-woven material made of polyolefin fibers with an average fineness of 0.1 d or less and a basis weight of at least 10 q/T112.

(2) Air permeability is at least 15CC/Cm2/Se
c.

(JIS L-1096 eight methods) and has a moisture permeability of at least b3000Q/Tn2・24hr (JIS
Z-0208 method: 40'C, 90% R1+, 4 hours) The cooling material according to claim (1).

(3) The cooling material according to claim 1, wherein the polyolefin is polypropylene.

(4) The cooling material according to claim (1), wherein the nonwoven material contains a diaqueous compound.

In the present invention, polyolefin means a saturated hydrocarbon resin, such as resins represented by polypropylene, polyethylene, and polyethylene. What is unique here is that the resin is hydrophobic,
It may contain other copolymer components as long as such hydrophobicity is not inhibited. Advantageously, polypropylene is a homo- or copolymer mainly constituted by polyethylene, with polypropylene homopolymers being particularly preferred.

In the present invention, polyolefin fibers have an average fineness of 0.
．． Cover with fibers of 1 d or less. Although the thinner the fibers of the present invention are, the higher the effect, it is preferable that the main fibers are W4 fibers with an absolute fineness of about 0.04 d or less. Therefore, it is preferable that the maximum fineness is at most about 2 to 3 d. When fibers with a fineness exceeding 3d are mixed, water leakage from the fiber portion increases, which is not preferable.

Preferably, the average fineness is 0.05d or less. In terms of number average fineness, it is preferably about 0.07 d or less, more preferably 0°05 d or less.

Such fibers have a basis weight of 10 Cl/m2 or more, preferably 20 Cl/m2 or more.
C1/- or more, especially 30 Q/m2 or more, non-woven I
It is preferable from the standpoint of waterproofness and cooling properties.

If the basis weight is less than 10q/T112, it may not be able to be used strongly depending on the application, and there is a tendency for water to leak easily.

In terms of waterproofness, the higher the waterproofness, the higher the performance, but the properties as a nonwoven fabric and cooling performance will be impaired. Therefore, although it depends on the use, the basis weight is preferably at most 500g/T112, and usually 300g/T112.
g/m2 or less is preferable from the viewpoint of non-woven properties, bulkiness, and cooling properties.

However, in the case of such non-woven A11 that has been heat-pressed to reduce its bulk, even if it exceeds 500g/Tl12, it will not support the product design that much, so 15cc/(J
/SeC, breathability and 3000g/m2・24h
This type is effective as an industrial cooling material if it has a moisture permeability of R culm.

Reinforcing such a non-woven material with an appropriate reinforcing material is
Preferable in relation to basis weight. That is, since a material with a low basis weight has strength defects, it is preferable to reinforce this with a high-strength material, since this has the advantage of expanding the range of applications. As such a reinforcing material, fibers are selected because they do not inhibit the air permeability and moisture permeability that are the characteristics of the present invention, that is, they are easy to form a structure that does not inhibit cooling performance. Therefore, such reinforcing fibers are appropriately filled and used within a range that does not impede the cooling properties of the cooling material of the present invention. For example, a structure in which a reinforcing material in the form of a woven or knitted fabric or a lattice is laminated inside or outside the non-woven layer of the present invention and crimped or fused is preferably applied.

Such reinforcing materials may be laminated in any number of layers.

The web 15 referred to in the present invention is usually formed into a sheet by a web in which filaments or staples are laminated by a method of entangling and/or pressing with a twenty-one dollar punch, high-pressure water jet, calender, etc., but the present invention includes a needle punch. From the viewpoint of sheet properties, a web formed by a melt-blowing method (FFAILT) is preferable for the glue formed by a punch ink method such as a high-pressure water jet.

The characteristics of this self-woven fabric are that the single fibers are crimped and are composed of three-dimensional entanglement.

First of all, it is preferable that the entanglement be random, and that it be more or less uniformly random, from the viewpoint of waterproof performance and cooling performance.

Such a single fiber shape and intertwined fS structure act synergistically on the waterproof properties and cooling properties of the present invention, exhibiting excellent cooling properties, and also have a favorable effect on water leakage resistance.

Such webs are disclosed in, for example, JP-A-58-13785, JP-A-56-68152, and JP-A-53-4.
It is formed by a melt blowing method described in Japanese Patent No. 1577 and the like.

Such a web can be further strengthened and waterproofed by calendering. In this step, it is advantageous in terms of the process to have the reinforcing material present. Such a calendar has a temperature of 80'C or higher, preferably 1
Under pressure strip 1 at a temperature of 00'C or higher! All conditions apply.

When heat-compression bonding or partial heat-sealing is carried out using such a calendar, care must be taken not to impair the air permeability and moisture permeability of the nonwoven material.

In the present invention, the non-woven material 1'J may contain a porous polymeric elastic material such as polyurethane, polytetrafluoroethylene, or silicone resin (provided that it is breathable and has a claw shape).

A feature of the present invention is that the air permeability and moisture permeability of the non-woven material provide a high level of cooling performance.

In other words, the air permeability is measured by JIS L-1096 eight methods, and is at least 15 CC/Cm2/SeC, with a good value of 30 cc/cm2/sec, and above, a good value of L < kl 45 cc/cm2/sec, The above moisture permeability was measured according to JIsZ-0208 method (40'C, 90% R1+, 4 hours) and was at least 3000g / 112-24hr, preferably 5
000q/Tn2・24hr or more, more preferably 6
000 g/Tn2・24hr or more.

Note that if the cooling material of the present invention has only cooling performance, J:
Although it is a small item, if it is waterproof at the same time, it has the advantage that the degree of freedom in product design h1 is expanded. Therefore, the higher the water leakage resistance of the nonwoven fabric, the more preferable it is. Water leakage resistance is evaluated by water resistance, and when measured according to the JIS L-1092 method, the cooling material of the present invention has a water resistance of at least 1 Qcm, preferably 20 cm or more, and more preferably 33 cm or more.

This water leakage resistance can be roughly doubled by incorporating a water-retaining compound into the nonwoven fabric, which is suitable for the present invention.

Examples of such dihydric compounds include compounds that are usually used as water repellents, such as silicon compounds and fluorine compounds. Among them, reactive dihydric compounds are preferably used from the viewpoint of durability.

Particularly suitable for industrial materials is one in which the nonwoven material 11 contains a diaqueous compound.

Examples of such silicon-based compounds include dimethylpolysiloxane and polysiloxane compounds modified by introducing hydroxyl groups, amino groups, hydrogen, epoxy groups, polyneedle groups, etc. into the terminals or side chains of dimethylpolysiloxane molecules. Examples include oil or emulsion.

In addition, fluorine-based compounds are usually polyallylic acid esters composed of polyacrylic acid and fluorine-based alcohols, such as polypentadecafluor; Examples include fluorine-based hydrocarbons such as ethylene-hexafluoropropylene copolymer.

Such diaqueous compounds are applied to the nonwoven fabric in the form of a solvent solution or an emulsion dispersed with an emulsifier or the like. As the method for applying A1, any of the commonly used methods such as a bat method, a dipping method, and a spray method can be used, and the method can be selected depending on the purpose.

After these water repellent agents are applied to the non-woven fabric, they are dried,
Heat treated. 110 thermal humidity, for example, in the case of a reactive water-polishing compound, the treatment is performed above its reaction temperature. However, taking into account that it is a fiber or a polyolefin, consideration should be given to using a catalyst, for example, or selecting a fiber that reacts at as low a temperature as possible.

In this case, a method of crosslinking the water-polishing compound (4L5) by employing low-temperature plasma treatment is also a preferred embodiment.

The property of improving the performance of the aqueous compound 1 can be improved by heat treatment, but the temperature conditions in this case are 1
The temperature may be any temperature that allows sufficient thermal movement of one molecule of the hydrophilic polymer, for example, 50°C or higher, preferably 70°C or higher.
Heating is carried out at a temperature of 100° C. or higher, or even 100'C or higher, for several seconds or more.

As for the heating employed for such finishing processing, it is preferable to uniformly heat the non-woven material, and hot air treatment is the most preferred embodiment. Heat theory, press heating such as an iron, etc. are acceptable.

The cooling medium of the present invention uses a liquid such as water as the cooling medium and cools it directly by the latent heat of vaporization of the liquid itself. Therefore, in addition to the liquid, the material holding the liquid A mode in which these are used in combination is also applicable. That is, there is an application method in which the material of the present invention and a material having water absorption/water retention properties are laminated, and this water retention layer is filled with water.

Next, the present invention will be explained in more detail using Examples.

[Example 1 In Example 1, the average fineness is 0.07d, and the mesh is 420Q/m2.40.
Three types of nonwoven fabrics with C1/m2.60 Q/m2 were formed.

When a water leakage test was conducted by pouring water into bags formed by melt-bonding these nonwoven fabrics, there was no water leakage in any of the bags, indicating good waterproof properties.

A bag was made by folding these nonwovens 15 and heat-sealing the ends, and when the bag was filled with water and left hanging for 4 hours, the water temperature was 17°C compared to the ambient temperature. is about 10
It showed good cooling properties of ℃.

The nonwoven properties of these nonwoven fabrics were measured and the results are shown in Table 1.

Table 1 Table weight: Q/m' Air permeability: cc/cm2/sec, (JIS L-1
096A method) Moisture permeability: g/m2・24hr (JI
(According to S2-0208 method) Water resistance: Cm
(JIS L-1092 Eight Methods) [Effects of the Invention] The present invention provides a cooling material that has the same characteristics as ordinary textile products.

The cold JJI material of the present invention decomposes the liquid sealed inside from the surface of the 'fa navy blue clay' and cools it with its latent heat of evaporation, and air can also be blown into the material from the outside through the fibers. can. In other words, it is a cooling material that has a breathing-like function. In addition, it can be easily provided from those with sufficient flexibility to those with appropriate strength and hardness for industrial use, and is characterized by an extremely high degree of freedom in product design.

The material of the present invention can be applied to various applications requiring cooling, such as water bottles, shipping containers, poultice materials, and beer cooling products.

Claims (4)

[Claims] (1) A nonwoven fabric made of polyolefin fibers with an average fineness of 0.1 d or less and a basis weight of at least 10
Cooling material with g/m^2. (2) Air permeability is at least 15cc/cm^2/sec
．． (JIS L-1096A method) and has a moisture permeability of at least 3000g/m^2・24hr (JIS Z
-0208 method: 40° C., 90% RH, 4 hours) The cooling material according to claim (1). (3) The cooling material according to claim (1), wherein the polyolefin is polypropylene. (4) The cooling material according to claim (1), wherein the nonwoven fabric contains a water-repellent compound.