JP2592465B2 - Breathable waterproof sheet - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a moisture-permeable waterproof sheet formed by laminating a resin film on a fiber base fabric. INDUSTRIAL APPLICABILITY The moisture-permeable waterproof sheet of the present invention is waterproof and has a moisture-permeable property that allows water vapor to freely pass therethrough, and can be applied to clothing such as sportswear, diaper covers, rainwear, and wall materials. It can be widely used for building materials such as ceiling materials and living related materials such as dehumidifier base materials.

[Conventional technology]

In general, a moisture-permeable waterproof sheet is obtained by applying a solvent-based resin to a fiber base cloth and forming pores smaller than the particle size of rainwater on the resin film and larger than water vapor or copolymerizing the resin with a hydrophilic group. Although it is manufactured by a method of moving water vapor, it has high resin and processing costs, and can be applied to expensive clothing such as sportswear.
It has been difficult to develop it for use in living related materials.

In addition, the moisture-permeable waterproof sheet using a water-based resin has a disadvantage that the drying efficiency for removing water and forming a resin film is inferior to that of a solvent-based resin, and the processing cost is high due to a decrease in productivity. ing.

[Problems to be solved by the invention]

Means for Solving the Problems The present inventors have solved the problems of the prior art, and have conducted intensive studies for the purpose of providing a highly productive and inexpensive moisture-permeable waterproof sheet. As a result, the present invention has been completed.

[Means for solving the problem]

The present invention relates to a moisture-permeable waterproof sheet in which a resin coating is laminated on a fiber base cloth, wherein the fiber base cloth has a crystallinity of 70 to 85% melt-spun at 7000 m / min or more, and a peak position of a dynamic elastic modulus tan δ. Is a moisture-permeable waterproof sheet, characterized by using a polyester filament of 95 to 110 ° C. and using an aqueous resin as a resin film.

The typical polyester filament according to the present invention is substantially composed of polyethylene terephthalate and can be obtained by a known polymerization method. Additives usually used for polyester, for example, matting agents, stabilizers, ultraviolet absorbers ,
It may contain an antistatic agent and the like. The degree of polymerization is not particularly limited as long as it is within the range for ordinary fiber formation. Also, a copolymer obtained by copolymerizing other components such as isophthalic acid, sodium salt of sulfonated isophthalic acid, polyethylene glycol, etc. at a weight ratio of less than 5% may be used within a range not to impair the object of the present invention.

In the present invention, a polyester filament melt-spun at a high speed of 7000 m / min or more is used. A typical production method is disclosed in JP-A-57-121613.

The ester filament spun at a general speed of 1000 to 2000 m / min has a crystallinity of 50 to 60% and a peak position of the dynamic elastic modulus tan δ at 110 Hz of 125 to 135 ° C and dry heat shrinkage at 160 ° C. Is 8 to 10%. However, polyester filament melt-spun at a high speed of 7000 m / min or more,
Crystallinity is as high as 70-85% and peak position of tan δ is 9
Low 5 to 110 ° C, dry heat shrinkage at 160 ° C is 8 to 10%
The characteristic feature is that the heat shrinkage of the completed fiber base fabric is extremely small.

In manufacturing the moisture-permeable waterproof sheet of the present invention, high-temperature treatment can be performed at the time of drying at the time of forming a film of an aqueous resin by utilizing the characteristics of the yarn. In addition, it has a feature that high-speed processing can be performed, and in particular, productivity when processing a conventional moisture-permeable waterproof sheet using an aqueous resin is significantly improved, and an inexpensive sheet can be obtained.

In addition, a fiber base fabric made of filament spun at a general speed of 1,000 to 2,000 m / min applies a resin solution in the state of a greige machine, and when dried, heat shrinks greatly and cannot be produced due to width change. Although processing must be performed after heat setting to stop shrinkage of the greige material, in the present invention, the fiber base fabric made of filament spun at 7000 m / min or more has a low heat shrinkage, so Another characteristic is that a moisture-permeable waterproof sheet can be obtained by applying and drying a resin solution.

The single filament denier and the number of filaments of the polyester filament can be all applied as long as they have a configuration used for general synthetic fiber filaments. In addition, any fabric such as a woven fabric or a knitted fabric can be used for the structure of the fiber base fabric.

In the present invention, any resin film can be used as long as it is a water-based resin. In particular, urethane resins, acrylic resins, nylon resins, ester resins, vinyl acetate resins, vinyl chloride resins, styrene-butadiene resins, An acrylonitrile-butadiene-based resin, a polyvinyl alcohol-based resin, a melamine-based resin, a melamine-formalin-based resin, a urea-formalin-based resin, a glyoxal-based resin, and the like can be used, and preferably two or more kinds can be used in combination. Also, if necessary, a crosslinking agent, a flame retardant,
Thickeners, fillers, foaming agents and coloring agents can be added.

The amount of the resin applied affects the moisture permeability and waterproofness. If the amount is too small, the moisture permeability is good but the waterproofness is poor. If the amount is too large, the waterproofness is good but the moisture permeability is good. Is significantly reduced, the coating amount is preferably 3 to ²⁰ g / m ² , and more preferably 5 to 10 g / m ² .

When the moisture-permeable waterproof sheet according to the present invention is manufactured by a coating method in which a resin solution is applied to a fiber base fabric, the resin solution easily penetrates into the inside and the back surface of the fiber base fabric when the resin solution is applied to the fiber base fabric. Therefore, it is preferable to pre-treat the fiber base fabric in advance because the resin film formation is inferior and the waterproof property is not preferable. As a treatment method therefor, for example, a method of treating a fiber base fabric by combining one or more kinds of water repellents such as fluorine-based, silicone-based, zirconium-based, and wax-based fabrics, and passing the fiber base fabric through a calendar There is a method in which the swelling of the fiber base cloth is crushed to reduce the pores on the surface of the fiber base cloth.

The method of applying the resin solution to the fiber base cloth is not particularly limited, but generally, a floating knife coater, a knife over roll coater, a reverse roll coater,
A roll doctor coater, a gravure roll coater, a kiss roll coater, a nip roll coater and the like can be used.

The moisture-permeable waterproof sheet of the present invention can be subjected to post-treatment. The post-treatment can be arbitrarily performed depending on the field of application.
There are treatments on curing.

FIG. 1 is a sectional structural view of a moisture-permeable waterproof sheet of the present invention manufactured by a coating method.

In FIG. 1, 1 indicates a resin film, and 2 indicates a fiber base fabric.

〔Example〕

Hereinafter, the moisture-permeable waterproof sheet of the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. In addition, the measuring method of the characteristic shown in an Example is as follows.

Moisture permeability: The moisture permeability was measured by the JIS L-1099 A-1 method.

Water resistance: Water resistance was measured according to JIS L-1092.

Base fabric width change: The base fabric width after application of the aqueous resin was measured and compared with the original width (122 cm).

Morphological change: Hand feeling and morphology of the base fabric after application of the aqueous resin were sensory evaluated.

Example 1 Polyester filament 75 spun at 7000 m / min.
Using d / 36f, the fabric was woven into a plain weave with a warp density of 100 yarns / inch and a weft density of 85 yarns / inch, and this was used as a fiber base fabric to produce a moisture-permeable waterproof sheet in the following steps.

<Coating> A resin solution prepared according to the following formulation was coated on one surface of a fiber base fabric with a floating knife coater. The coating amount of the resin was 10 g / m ² .

Gohsenol N-300 15 parts (Nippon Gosei Co., Ltd. polyvinyl alcohol resin) Sumitex Resin M-3 10 parts (Sumitomo Chemical Co., Ltd. melamine resin) Sumitex Accelerator ACX 1 part (Sumitomo Chemical Co., Ltd. organic) Amine) Musi gum 20 parts (Nippon Talc Co., Ltd. White Filler) Water 85 parts

Heat treatment conditions (1) 130 ° C × 2 minutes (2) 140 ° C × 2 minutes (3) 150 ° C × 2 minutes (4) 160 ° C × 2 minutes (5) 160 ° C × 1 minute (6) 160 ° C × 30 seconds <Water-repellent treatment> After immersion in the following aqueous solution and squeezing to a squeezing ratio of 40% with a rubber roll, heat treatment was performed at 150 ° C for 2 minutes using a pin tenter.

Asahigard LS317 2 parts (Fluorine-based water repellent from Meisei Chemical Co., Ltd.) Water 98 parts For comparison, each as a moisture-permeable waterproof sheet (Comparative Example 1) obtained using a fiber base cloth spun at 1000 m / min. Table 1 shows the results of measuring and comparing the characteristics of the above.

As shown in Table 1, the moisture-permeable waterproof sheet obtained at a spinning speed of 1000 m / min showed a large change in the width of the fiber base fabric, a shrinkage of about 1 C%, and a rough feel.

In addition, the heat treatment at 150 ° C. or more caused large shrinkage in the width direction, and the fiber base fabric was torn, so that a moisture-permeable windproof sheet could not be obtained.

In Example 1, which is within the scope of the present invention, the shrinkage in the width direction was as small as 5% or less even after the high-temperature heat treatment, and the water pressure resistance also tended to be improved.

From Example 1, the use of a fiber base fabric within the scope of the present invention enables a higher temperature treatment and a shorter heat treatment time under heat treatment conditions as compared to a fiber base fabric having a conventional spinning speed, thus streamlining. be able to.

In addition, when Example 1-6 was used for the wall material for wooden houses, it became clear that a good thing without internal dew was obtained.

Example 2 Polyester filament spun at 7000 m / min.
Using 50d / 24f for warp and 75d / 36f for weft, 105 warp /
The fabric was woven into a plain weave with an inch and a weft density of 83 yarns / inch, and this was used as a fiber base fabric to produce a moisture-permeable waterproof sheet in the following steps.

Water-repellent treatment of fiber base cloth
% And heat shrunk at 110 ° C. for 2 minutes.

Erasguard 100 1 part (Daiichi Kogyo Seiyaku Co., Ltd. Futsu's coarse water repellent) Water 99 parts Coating One side of a water-repellent fiber base fabric having the following composition was coated with a floating knife coater. The amount of resin applied is 8 g / m ² .

Apiros 7023u 100 parts (Acrylic resin of Yoshimura Oil Chemical Co., Ltd.) Hydran HW-111 50 parts (Urethane resin of Dai Nippon Ink Co., Ltd.) CR-5L 2 parts (Epoxy cross-linking agent of Dai Nippon Ink Co., Ltd.) Then, heat treatment was performed at 150 ° C. for 2 minutes.

Water-repellent treatment After immersion in the following aqueous solution and squeezing to a squeezing ratio of 40% with a rubber roll, heat treatment was performed at 150 ° C for 2 minutes using a pin tenter.

Erasgard 100 5 parts Sumitex Resin M-3 1 part (Sumitomo Chemical Co., Ltd. melamine resin) Sumitex Accelerator ACX 0.1 part (Sumitomo Chemical Co., Ltd. Organic amine) Water 93.9 parts For comparison, at 1000 m / min Table 2 shows the results obtained by measuring and comparing the moisture-permeable waterproof sheet obtained using the spun fiber base cloth as Comparative Example 2.

From Table 2, it can be seen that the moisture permeability and the water pressure resistance of Example 2 and Comparative Example 2 are not much different from each other. Stable production was not possible. In Example 2, the feeling was soft and stable production was possible.

〔The invention's effect〕

The moisture-permeable waterproof sheet of the present invention is inexpensive because it can be heat-treated at a high temperature and a high speed even if an aqueous resin is applied, since the polyester filamet melt-spun at a high speed of 7000 m / min or more is used as a fiber base fabric. In addition, a sheet excellent in moisture permeability and waterproofness can be obtained.

This moisture-permeable waterproof sheet can be used widely for clothing such as sportswear, diaper covers, rainwear, building materials such as wall materials and ceiling materials, and living-related materials such as dehumidifiers.

[Brief description of the drawings]

FIG. 1 is a sectional structural view of a moisture-permeable waterproof sheet manufactured by a coating method of the present invention. 1 ... Resin film, 2 ... Fiber base cloth.

Claims (1)

(57) [Claims] 1. A moisture-permeable waterproof sheet comprising a fiber base fabric and a resin film laminated thereon, wherein the fiber base fabric is melt-spun at 7000 m / min or more and has a crystallinity of 70 to 85% and a peak of dynamic elastic modulus tan δ. A moisture-permeable waterproof sheet characterized by using polyester filament at a position of 95 to 110 ° C and using an aqueous resin as a resin coating.