JPH0197272A - Moisture permeable waterproof sheet - Google Patents

Abstract

PURPOSE: To obtain the subject sheet excellent in moisture permeability and waterproofness at a low cost by coating a fibrous substrate comprising a nylon filament yarn melt spun at a high speed and having ultralow heat shrinkage with a water-based resin liquid. CONSTITUTION: This moisture-permeable and waterproof sheet is obtained by using a woven or a knitted fabric comprising a nylon filament yarn melt spun at a high speed of >=4,000 m/min as a fibrous substrate and coating the fibrous substrate with a water-based resin liquid comprising a polyurethane-based resin, an acrylic resin, or the like, according to a coating method, or the like, heat- treating the coated fibrous substrate and forming a resin coating film. The heat shrinkage is small even by carrying out a high-temperature treatment at the time of drying when forming the coating film of the water-based resin liquid by using the yarn melt spun at the high speed. High-speed processing can be conducted to remarkably improve the productivity and the inexpensive sheet can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a moisture-permeable waterproof sheet formed by laminating a resin film on a fiber base fabric. More specifically, the moisture-permeable waterproof sheet of the present invention is waterproof and has moisture permeability that allows water vapor to pass through freely, and can be used for clothing such as sportswear, diapers, rainwear, etc. It can be used in a wide range of applications, including building materials such as wall and ceiling materials, and living-related materials such as base materials for dehumidifiers.

[Conventional technology]

Moisture-permeable waterproof sheets are generally made by coating a fiber base fabric with a solvent-based resin to form pores in the resin film that are smaller than the particle size of rainwater and larger than water vapor, or by coating the resin with hydrophilic groups. It is manufactured using methods such as polymerization to transfer water vapor, but the resin and processing costs are high, and although it can be used for expensive clothing such as sportswear, it is an inexpensive building material.
It was difficult to develop it into applications for everyday life-related materials.

In addition, moisture-permeable waterproof sheets using water-based resins have disadvantages in that the drying efficiency for removing water and forming a resin film is inferior to that of solvent-based sheets, and processing costs are high due to decreased productivity. Limitations were forced.

[Problem that the invention seeks to solve]

The present inventors have completed the present invention as a result of extensive research aimed at solving the problems of the prior art and providing a highly productive and inexpensive moisture-permeable waterproof sheet.

[Means for solving problems]

The present invention is a moisture-permeable waterproof sheet formed by laminating a resin film on a fiber base fabric, characterized in that the fiber base fabric uses nylon filaments melt-spun at a speed of 4000 m/min or more, and the resin film uses a water-based resin. It is a moisture-permeable waterproof sheet.

Typical nylon filaments constituting the fiber base fabric of the moisture-permeable waterproof sheet of the present invention are nylon 66 polymerized with hexamethylene diamine and adipic acid, and nylon 6 polymerized with ε-caprolactam. However, other polyamide fibers can also be used. Further, copolymers with other components can also be used as long as the purpose of the present invention is not impaired.

Furthermore, additives commonly used in polyamide fibers, such as stabilizers, matting agents, antistatic agents, etc., may be included.

In the present invention, a nylon filament melt-spun at a high speed of 4 ooom/min or more is used, and a typical manufacturing method thereof is disclosed in Japanese Patent Application Laid-Open No. 143514/1983.

Nylon filaments spun at a typical speed of about 1000 m/min have crystal sizes of 35λ or less and 11
The peak position of the dynamic elastic modulus tan δ at oI (z K 80～
Because the temperature is as low as 100°C, the resulting fiber base fabric has an extremely low heat shrinkage rate.

In manufacturing the moisture-permeable waterproof sheet of the present invention, the above-mentioned characteristics are utilized, and it has the characteristics that it can be subjected to high temperature treatment during drying when forming a water-based resin film, and can be processed at high speed. In particular, it significantly improves productivity when processing conventional moisture-permeable waterproof sheets using water-based resins.
You can get cheap sheets.

In addition, fiber base fabrics made of filaments spun at a typical speed of about 1000 rn/min cannot be produced if a resin solution is applied in the gray state and dried, and the width changes due to large heat shrinkage. It was necessary to stop the shrinkage of the gray fabric before processing it, but the present invention's 40
Since the fiber base fabric made of filaments spun at 00 m/min or more has a small thermal shrinkage rate, a moisture-permeable waterproof sheet can be obtained by applying a resin solution in the state of t=grey and drying.

Any single yarn denier and filament number of the nylon filament can be applied as long as it has a configuration used for general synthetic fiber filaments. Moreover, all types of fabrics such as woven fabrics and knitted fabrics can be used as the structure of the fiber base fabric.

The resin film of the present invention can be applied to all water-based resins, but in particular, urethane resins, acrylic resins, nylon resins, ester resins, vinyl acetate resins, vinyl chloride resins, styrene-butadiene resins, Acrylonitrile-citadiene resin, polyvinyl alcohol resin,
Melamine resin, melamine-formalin resin, urea
Formalin-based resins, glyochidyl-based resins, etc. can be used, and preferably two or more types can be used in combination. In addition, crosslinking agents, flame retardants, thickeners, fillers, foaming agents, and colorants can be added as necessary.The amount of resin applied will affect moisture permeability and waterproofness, and If it is too low, the moisture permeability will be good but the waterproofness will be poor.
Also, if the coating amount is too large, the waterproofness will be good but the moisture permeability will be significantly reduced, so the coating amount should be 3 to 20g/m".
Preferably it is 5 to 10 g/m2.

When manufacturing the moisture-permeable waterproof sheet according to the present invention using a coating method in which a resin solution is applied to a fiber base fabric, when the resin solution is applied to the fiber base fabric, the resin solution penetrates into the inside and back surface of the fiber base fabric.1. It is preferable to pre-treat the fibrous base fabric in advance, since the resin film formation is poor and the waterproof properties are unfavorable. Treatment methods for this include, for example, treating the fiber base fabric with one type or a combination of two or more water repellents such as fluorine-based, silicone-based, zirconium-based, or wax-based water repellents, or passing the fiber base fabric through a calendar to remove the fibers. There are methods to reduce the pores on the surface of the fiber base fabric by crushing the bulge in the base fabric.

The method of applying the resin solution to the fiber base fabric is not particularly limited, but generally floating knives: r-ta +, +
Ifono-coal coater, J-lino roll coater, roll doctor coater, Clavier roll coater, kiss roll coater, nip roll coater, etc. can be used.

The moisture-permeable waterproof sheet of the present invention can be subjected to post-treatment. Post-treatments can be carried out as desired depending on the field of use, and include water repellent treatment, softening treatment, antistatic treatment, flameproofing treatment, hard finishing treatment, and the like.

FIG. 1 is a cross-sectional structural diagram 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 explained using Examples, but the present invention is not limited only to these Examples. Incidentally, the method for measuring the characteristics shown in the examples is as follows.

Moisture Permeability S Moisture permeability was measured by JIS L-1099A-1 method.

Waterproofness S Water pressure resistance was measured according to JIS L-1092.

Change in the width of the base fabric: The width of the base fabric after coating with the water-based resin was measured and compared with the ledger.

Change in form: The texture and form of the base fabric after coating with the water-based resin were sensory evaluated.

Example 1 Nylon 66 spun at 4000 m/min, roa/s+
F filament was used to weave a plain weave with a warp density of 100 threads/inch and a weft density of 90 threads/inch, and this was used as a fiber base fabric to produce a moisture permeable waterproof sheet in the following steps.

Coating> Apply a resin solution mixed with the following composition to one side of the fiber base fabric for 70 minutes.
- coated with a cutting knife coater. The amount of resin applied was 1.0 g/m2.

・Tucenol N-30015 parts (Nippon Gosei Polyvinyl Alcohol Resin) ・Sumitex Resin M-3101'lS (Sumitomo Chemical Melamine Resin) ・Sumitex Accelere-1-ACX ll
5 (Sumitomo Chemical Co., Ltd. organic amine) - Mushim 20 parts (Japan Talc white filler) - Water 85 parts Heat treatment> Using a short loop, heat treatment was performed at the following temperature.

Heat treatment conditions (11130℃ x 2 minutes (21140℃ x 2 minutes (3) 150℃ x 2 minutes (4) 160℃ x 2 minutes (5) 160℃ x 1 minute + 61160℃ x 30 seconds (water repellent treatment) In the following aqueous solution After dipping, the sample was squeezed with a bim roll to a squeezing rate of 40%, and then heat-treated at 1501:1 for 2 minutes using a pin tenter.

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

Lath Bottom 1 White According to Table 1, the moisture-permeable waterproof sheet obtained at a spinning speed of 1000 m/min had a large change in the width of the fiber base fabric and had a rough texture. Furthermore, the fiber base fabric, which shrinks in the width direction when heat treated at 150° C. or higher, was torn, making it impossible to obtain a moisture-permeable windproof sheet.

In Example 1, which falls within the scope of the present invention, shrinkage in the width direction was small even after high-temperature heat treatment, and water pressure resistance also tended to improve.

From Example 1, using a fiber base fabric within the scope of the present invention allows higher temperature treatment under heat treatment conditions than a fiber base fabric made of conventional spinning speed, and it is also possible to shorten the heat treatment time, making it possible to streamline the process. be able to.

It has become clear that when the ceramics of Examples 1-6 are used as wall materials for wooden houses, a good product free of internal condensation can be obtained.

Example 2 Nylon 66.70d/68 spun at 4000m/min
The F filament was used to weave a plain weave with a warp density of 135 threads/inch and a weft density of 105 threads/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 fabric The fiber base fabric is dipped in the following aqueous solution using a zam roll to increase the squeezing rate.
o* and heat treated at 100°C for 2 minutes.

・Erasgard 100 1 part (Dai Kogyo Seiyaku Co., Ltd., fluorine-based water repellent) ・Water 99 parts■The following composition was coated with a floating knife coater on one side of HI fiber fabric that had been water-repellent treated with■7.Resin The coating amount is 8g/m”.

・Avilos 7023U 100 copies (
Yoshimura Yukagaku Co., Ltd. acrylic resin) ・Hytran HW-11 150 parts (Dainippon Ink Co., Ltd. urethane resin) ・CR-5 2 parts (Inu Nippon Ink Kikki epoxy crosslinking agent) ■Using heat-treated short rusot at 150°C for 2 minutes Heat treated.

(2) Water repellent treatment After immersing in the following aqueous solution, the sample was squeezed with a rubber roll to a squeezing rate of 40 inches, and then heat treated at 150°C for 2 minutes using a pin tenter.

・Erasgard 100 5 parts ・Sumiterra Resin M-31 part (Sumitomo Chemical Co., Ltd. melamine resin) ・Sumitex Accelerator ACX
0.1 part (Sumitomo Chemical's organic amine) ・Water 93.9 parts For comparison, the characteristics of a moisture-permeable waterproof sheet (Comparative Example 2) obtained using a fiber base fabric spun at 1000 m for 7 minutes were compared. The results are shown in Table 2.

(Source of base fabric @ 125℃M) From Table 2, there is not much difference in moisture permeability and water pressure resistance between Example 2 and Comparative Example 2, but Comparative Example 2 has a large change in the width of the base fabric and has a paper-like texture and rough hardness. During manufacturing, warp lines occurred, making stable manufacturing impossible.

Example 2 had a soft texture and could be manufactured stably.

〔Effect of the invention〕

The moisture-permeable waterproof sheet of the present invention uses nylon filaments melt-spun at a high speed of 4,000 m/min or more as the fiber base fabric, so even if a water-based resin is applied, it can be heat-treated at high temperatures and high speeds, making it inexpensive and easy to use. A sheet with excellent moisture permeability and waterproof properties can be obtained. In addition, the moisture-permeable waterproof sheet of the present invention can be used in clothing such as sportswear, diapers, and rainwear, as well as building materials such as wall materials and ceiling materials.
It can be widely used in daily life-related materials such as dehumidifier base materials.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional structural diagram of a moisture-permeable waterproof sheet manufactured by a coating method according to the present invention. 1... tree, peritoneal membrane, 2... fiber base fabric. Patent applicant: Asahi Kasei Industries, Ltd. Figure 1

Claims (1)

[Claims] A moisture-permeable waterproof sheet formed by laminating a resin film on a fiber base fabric, characterized in that the fiber base fabric is made of nylon filaments melt-spun at a speed of 4000 m/min or more, and the resin film is made of a water-based resin.