JP2598760Y2 - Heat-insulating, moisture-permeable, waterproof fabric - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a heat-insulating, moisture-permeable, waterproof fabric which is particularly suitably used for sports clothing such as windbreakers and ski wear, in addition to raincoats.

[0002]

2. Description of the Related Art Conventionally, as a moisture-permeable waterproof fabric, a fabric obtained by laminating a microporous skin layer or a non-porous coating layer having moisture permeability on a fiber base material, or a fabric subjected to a water-repellent treatment in order to increase the heat insulating property is used. Among them, there are known those filled with a large amount of batting, and those containing an inorganic powder such as aluminum, carbon, ceramic or the like in a film layer having moisture permeability (Japanese Patent Publication No. 60-479).
No. 55, Japanese Patent Publication No. 1-35922, Japanese Patent Laid-Open No. 1-2919
No. 27).

[0003]

However, although these moisture-permeable waterproof fabrics are relatively good in terms of moisture permeability and water resistance, they are cold to the touch and are suitable for clothing, especially raincoats, windbreakers, and the like. When used for sports clothing such as ski wear, there is a problem that heat retention is lacking and sweat is condensed. Also, if the batting is filled with a large amount of batting to increase the heat retention, the clothing becomes thick, bulky, and has the disadvantage of being difficult to move. there were.

An object of the present invention is to provide a moisture-permeable waterproof fabric which does not impair moisture permeability and water resistance, has good texture and feel, and is excellent in heat retention and heat insulation.

[0005]

As a result of intensive studies to achieve the above-mentioned object, the present invention discloses that a heat-insulating, moisture-permeable, waterproof fabric is applied to a fiber substrate as in the prior art using a microporous film alone or without a porous film. Instead of laminating a porous coating layer, a configuration was employed in which a microporous coating and a moisture-permeable resin foam layer substantially consisting of closed cells were laminated on a fiber base material.

[0006] The laminating order for the fiber base material is as follows. First, a microporous film is laminated as an adhesive layer on the fiber base material, and then a moisture-permeable resin foam using a moisture-permeable resin substantially consisting of closed cells. It stacked layers.

As a fiber base material, a woven fabric made of natural fibers such as cotton, synthetic fibers such as polyamide or polyester,
Non-woven fabric, knitted fabric and the like can be given, but not particularly limited.

[0008] The resin forming the microporous film includes polyurethane, polyamino acid, polyacryl, polyamide, polyvinyl chloride, polyvinylidene chloride, and the like.
Examples include polyester-based, polyvinyl acetate-based, and polyvinyl alcohol-based. Particularly, polyurethane-based, polyamino-acid-based, and polyacryl-based are preferable. As a method of forming a microporous film, a wet coagulation method of applying a polar organic solvent solution of the polymer of the resin to a fiber base material and then immersing the same in water to form a microporous film, After applying an emulsion in which water is dispersed in an organic solvent solution of a polymer to a fiber substrate, drying, a dry coagulation method of sequentially evaporating the solvent and water can be employed, but is not particularly limited. . It is desirable that the microporous film obtained by the above method has pores of about 1 to 5 μm.

The moisture-permeable resin used for the moisture-permeable resin foam layer substantially consisting of closed cells is not particularly limited as long as it is soluble in a solvent, hardly swells in water, and has a film-forming ability. In addition, the same resin as the resin forming the microporous film can be used. In particular, for example, a polyvinyl alcohol-based resin, an acrylic resin, a urethane-based resin, and an amino acid-based resin, such as JISZ-0208B
The moisture permeability of the film (10 μm thick) measured by the
Those having a weight of 000 g / m ² · 24H or more are preferred.
These resins are usually used dissolved in an organic solvent,
In this case, the solid content in the solution is adjusted to 10 to 50% by weight, and the solution viscosity is adjusted to 100 to 5000 CPS.

[0010] As a method of foaming substantially closed cells in the moisture-permeable resin foam layer, for example, a method of foaming by mechanical stirring, a method of foaming with a gas generated during a chemical reaction, and a method of injecting a liquefied gas And a method in which a volatile solvent having a low boiling point is mixed or impregnated to vaporize, and a method using a foaming agent such as a pyrolytic or heat-expandable microcapsule. The method of forming the foamed layer is not limited to the above method, but among the above, the thermally expanded microcapsules are uniformly mixed in the moisture-permeable resin, the obtained compound is applied, and the mixture is heated and foamed in the moisture-permeable resin. The most preferred method is to use According to this method, the moisture-permeable resin foam layer is formed by heating and foaming a heat-expandable microcapsule in which a vaporizable liquid is embedded in a thermoplastic resin film in a moisture-permeable resin.

The thermally expandable microcapsules used in the present invention are microspheres in which a vaporizable liquid is embedded in a thermoplastic resin film, and when heated to an appropriate temperature, the liquid embedded therein is vaporized. The pressure causes the entire capsule to expand, giving a foam having an increased volume (hereinafter abbreviated as “foaming”).
As the thermoplastic resin constituting the microcapsules, those having a softening point of 50 to 200 ° C. are preferable,
Examples of this type of resin include homopolymers such as polyvinyl chloride, polyvinylidene chloride, polyacrylonitrile, polymethyl acrylate, polymethyl methacrylate, and polyvinyl acetate, and copolymers thereof.

As the vaporizable liquid to be embedded, a low-grade hydrocarbon which is easy to microencapsulate and is inexpensive, such as liquid butane, is suitable. The microcapsules before foaming have a particle size of 5 to 30 μm, and have the property of foaming several to tens of times when heated at 50 to 200 ° C. for several minutes.

The mixing ratio of the heat-expandable microcapsules and the moisture-permeable resin is in the range of 2 to 500 parts by weight of the microcapsules per 100 parts by weight of the solid content of the resin in the solution. This is because the foam lacks a particularly soft feeling after foaming, and when the amount is 500 parts by weight or more, the strength of the moisture-permeable resin foam layer is low, the adhesion to the base material is poor, and the moisture permeability is impaired. In particular, 5 to 100 parts by weight is a preferable range. When mixing the heat-expandable microcapsules, it is important to uniformly mix and disperse them using an appropriate method such as a dissolver, a homodisper, or a paint roll.

As a method of laminating the above-mentioned moisture-permeable resin foam layer, for example, a solution type may be coated as described above, but a thermoplastic type may be used. In this case, a film is formed by extrusion or the like. And stack.

It is preferable to add a moisture absorbent to the moisture-permeable resin foam layer, since sweat is more easily absorbed.
The addition of powders of carbon, aluminum, ceramics, etc. increases the heat retention. Also, powders having a deodorizing effect such as zeolite and activated carbon can be added. Further, in order to improve the water leakage resistance of the heat retaining moisture permeable waterproof cloth, a water repellent is internally added to the resin forming the microporous film and / or the foamed layer, or a water repellent treatment is applied to the fiber base material before application. Alternatively, a water-repellent treatment may be performed after the application, or any of these may be combined. Examples of the water repellent include fluorine-based and silicon-based.

The moisture permeability of the heat-insulating and moisture-permeable waterproof fabric thus completed is 500 g / m ² · 24H or more (JISZ028B
Method), withstand pressure of 0.2 kg / cm ³ or more (JISL10
29).

[0017]

The fabric according to the present invention has a structure in which a microporous film and a moisture-permeable resin foam layer composed of substantially closed cells are laminated on a fiber base material, so that the fabric is excellent in moisture permeability and water resistance, and is kept warm. Excellent heat insulation. In particular, when a microporous film is laminated on a fiber base material, and when a moisture-permeable resin foam layer substantially composed of closed cells is further laminated thereon, it is good in terms of feel and texture, and substantially In addition, since it is composed of closed cells, the surface is not stained, and the water resistance is further improved.

[0018]

1 is a cross-sectional view showing one embodiment of a heat-insulating, moisture-permeable waterproof fabric according to the present invention, wherein 1 is a fiber base material, 2 is a microporous film laminated on the fiber base material 1, 3 Is a moisture-permeable resin foam layer further comprising substantially closed cells laminated thereon.

In this embodiment, the fiber substrate 1 is made of nylon taffeta, and this nylon taffeta is coated with a urethane resin emulsion (trade name "Heimlen X-3038",
100 parts, manufactured by Dainichi Seika Co., Ltd., MEK (13) / toluene (18)
, 31 parts of water (50) / MEK (5) , 2 parts of a crosslinking agent (trade name "Resamine X", manufactured by Dainichi Seika Co., Ltd.), and a water repellent (trade name "Rezamine UM-317") , Manufactured by Dainichi Seika Co., Ltd.) and mixed with a knife coater at 300 g / m2.
^{After 2} coatings, the coating was dried at 80 ° C. for 2 minutes and further at 130 ° C. for 2 minutes to form a microporous film 2.

Then, polyethylene glycol and isophorone diisocyanate are heated and polymerized by a conventional method, and the obtained urethane polymer is dissolved in a mixed solvent of toluene and isopropanol. Then, 50 parts by weight of a heat-expandable microcapsule (trade name “Microsphere F-50D, manufactured by Matsumoto Yushi Pharmaceutical Co., Ltd.”) is added to this solution per 100 parts by weight of the solid content, and the mixture is uniformly mixed. 100 for coating 2
g / m ^{2 and} dried at 50 ° C. for 20 minutes.
By heating and foaming at 0 ° C. for 1 minute, the moisture-permeable resin foam layer 3 substantially consisting of closed cells is formed.

The moisture-permeable, moisture-permeable waterproof fabric obtained by the above method was measured for moisture permeability, water pressure resistance, and heat retention. Table 1
Indicates the result. The moisture permeability is JISZ0208B
Law, water pressure resistance was measured by JISL10 92, heat retention was evaluated by outdoor wear test (outside temperature 5 ° C.).

For comparison, a microporous film was formed on nylon taffeta in the same manner as in the above example, and then a urethane polymer obtained by heating and polymerizing polyethylene glycol and isophorone diisocyanate in a conventional manner was used. 100 g / m ^{2 of} a solution dissolved in a mixed solvent of isopropanol is applied on the above microporous film at 50 ° C.
For 20 minutes, and using a cloth having a non-foamed, non-porous moisture-permeable resin layer formed thereon, the moisture permeability, water pressure resistance, and heat retention were measured. Table 1 also shows this comparative example.

[0023]

[Table 1]

As can be seen from Table 1, the examples and comparative examples are good in moisture permeability and water pressure resistance, but in the examples, the feel when worn is better than in the comparative examples, and the running time is 5 minutes. Later wetting of the body side did not occur in the examples, and it was found that it was particularly suitable for sports clothing such as windbreakers and ski wear.

The present invention is not limited to the above embodiment. In particular, the heat-insulating, moisture-permeable, waterproof fabric of this invention is:
Although it is particularly suitable for sports clothing such as windbreakers and ski wear, it can be applied to various uses such as raincoats, medical or dustproof clothing, tents and waterproof sheets.

[0026]

As is apparent from the above description, according to the present invention, the second resin layer is made of a moisture-permeable resin foam layer using a moisture-permeable resin composed of closed cells, thereby providing moisture permeability and water resistance. excellent in heat retention properties when worn, Ru can exhibit a remarkable effect in the thermal insulation, as well as anti-wetting function. In addition, when the heat-expandable microcapsules are used as the foaming agent, there is an effect that it is easy to form an independent foam layer having a thickness (unit: μm) suitable for clothing.

[0027]

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a heat-insulating, moisture-permeable, waterproof fabric according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fiber base material 2 Microporous film 3 Moisture-permeable resin foam layer consisting of substantially closed cells

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Tomio Shimizu 1176 Uchigaike, 6/1/6, Inami-cho, Kako-gun, Hyogo Toyo Tire & Rubber Co., Ltd. 113230 (JP, A) Fully open Showa 64-57036 (JP, U) Really open Showa 48-112864 (JP, U)

Claims (2)

(57) [Scope of request for utility model registration] 1. A heat insulating property wherein a microporous film is laminated on a fiber base material, and a moisture-permeable resin foam layer using a moisture-permeable resin substantially consisting of closed cells is further laminated thereon. Moisture permeable waterproof fabric. 2. The moisture-permeable resin foam layer comprising substantially closed cells is formed by thermally foaming a heat-expandable microcapsule in which a vaporizable liquid is embedded in a thermoplastic resin film in a moisture-permeable resin. The heat-insulating, moisture-permeable, waterproof fabric according to claim 1 which is made.