JPH0455161A - Soft structure material for air cushion ship - Google Patents

Abstract

PURPOSE:To increase contact surface of rubber and the surface of yarn of texture to increase the adhesive force by coating texture, which is hexagonally knitted with a clearance factor at 10-70%, with elastomer. CONSTITUTION:As the material to be used for skirt material or seal material of an air cushion ship, hexagonally knitted texture, which is formed with a clearance factor at 10-70% and has softness, coated with elastomer is used. Durability can be improved remarkably and a lifetime can be prolonged by coating the surrounding of yarns 2 of the texture with elastomer 1.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention is directed to Air Cu5hi
The present invention relates to flexible structural materials for onvehicles (abbreviated as ACV), and more specifically to flexible structural materials for air-action boats with improved durability.

[Conventional technology]

Conventional air action boats float by pumping air between the lower part of the hull and the water surface, and for this purpose an air chamber is formed using flexible structural material in the lower part of the hull to maintain the air at a constant pressure. are doing. This flexible structural material is a skirt material in the case of a hovercraft with amphibious functions,
Side wall type air effect controller 1 (Surface Effec
t5hip (abbreviated as SES), it is called a sealing material.

Conventionally, the material for skirts or seals on air action boats such as hovercloughs and SES has been woven fabrics made from synthetic fibers such as polyamide (nylon), aramid (aromatic polyamide), and polyester, which have been adhesively treated. , rubberized fabric coated with natural rubber (NR) or synthetic rubber is used. Synthetic rubbers include acrylonitrile-butadiene copolymer (NBR), polychloroprene (CR), blends thereof, polyurethane (PU), oxypropylene (OPR), etc.
), ethylene-propylene copolymer (Ep.

M), chlorosulfonated polyethylene (C3M), butyl rubber (IIR), a blend of vinyl chloride (PVC) and NBR, and a blend of butadiene rubber (BR) and NR have been used.

In the following description, natural rubber, synthetic rubber, and various blended rubbers are collectively referred to as elastomers.

[Problem that the invention seeks to solve]

Due to its intended use, the skirt or seal material of an air action boat is subjected to severe usage conditions, which causes material damage due to bending and heat generation, and currently causes deterioration in a relatively short period of time. Therefore, from the viewpoints of operational purposes, profitability, performance, etc. of boats, there is a desire for a boat that is more durable and has a longer lifespan.

The short lifespan is caused by a complex combination of factors such as the fiber structure of the woven fabric that makes up the skirt material or sealing material, the adhesion between the woven fabric and the elastomer, the elastic modulus of the elastomer, and the permeability of the elastomer to the woven fabric. considered to be a thing.

Regarding the fiber structure, as shown in FIG. 1, woven fabrics such as plain weave, twill weave, and satin weave have been used as reinforcing materials for rubberized fabrics.

However, in these woven fabrics, adjacent warp threads and weft threads are woven closely and the threads are in contact with each other.
The woven fabric itself tends to become a single plate-like fabric. Therefore, the elastomer is difficult to impregnate into woven fabrics and fiber structures, and it is difficult to obtain an anchoring effect between the front and back surfaces of the coated elastomer. Adhesion between the woven fabric and the rubber (elastomer) tends to deteriorate due to the influence of water or seawater penetrating from the surface.

Therefore, once the woven fabric and elastomer begin to delaminate, repeated vigorous vibrations of the skirt or seal will cause the delamination to progress rapidly, and at the same time the woven fabric itself will be exposed directly to water or seawater, causing the rubber coating to delaminate. "Peeling" and "tearing" occurred from the fibers at the cross-sectional position of the cloth, leading to sharp corners and severe deterioration, leading to a deterioration of its function as a skirting material or sealing material.

[Purpose of the invention]

This invention was devised in view of the above-mentioned conventional problems, and it makes it easier for elastomers to be impregnated into woven fabrics and fiber structures, and the anchoring effect between the front and back surfaces of the coated elastomer creates a sealing material. The object of the present invention is to provide a flexible structural material that can extend the life of the air cushion.

[Means to solve the problem]

In order to achieve the above object, this invention has a woven fabric with a porosity of 1.
The gist is that a hexagonal woven fabric composed of 0 to 70% is coated with an elastomer.

[Action of the invention]

This invention provides a material for use as a skirt material or sealing material for an air action boat that has a porosity of woven fabric of 10 to 70.
By coating elastomer on a hexagonal-knit woven fabric, which has a flexible tissue structure composed of 100% of elastomer, its durability can be significantly improved and its lifespan can be extended.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

FIG. 2(a) is a model diagram of the hexagonal weave of the woven fabric according to the present invention, and FIG. 2(b) is an enlarged view of the hexagonal weave.

Here, the constituent unit area of the woven fabric is xy (horizontal dimension X).

If the vertical dimension is yL, the warp thread thickness is a, and the weft thread thickness is b, then the part of the woven fabric where the threads are not inserted, that is, the gap, is (x-2a)
It is expressed as (y-2b)/X-Y and expressed as a percentage by multiplying by 100, which can be called porosity (%).

In this invention, the porosity of the woven fabric is 10 to 70%. If the porosity of the woven fabric is less than 10%, the woven fabric becomes close to the conventionally used plain weave and 2×2 satin weave, and a significant effect in extending the life of the woven fabric as a skirt material or sealing material cannot be obtained; This is because if it exceeds %, the number of threads, which are the strength members of the rubberized cloth, will be relatively too small, and the life of the rubberized cloth will be poor.

In addition, for woven fabrics with a porosity of 50 to 70%, process troubles such as misalignment of the woven fabric and fabric breakage are likely to occur due to the shearing force during the rolling process of the covering rubber, but it is possible to dissolve the covering rubber in an organic solvent. This woven fabric is soaked in the rubber paste prepared by
Process troubles during rolling can be avoided by performing preliminary vulcanization.

The flexible structural material for air action boats of the present invention is shown in FIG.
) is coated with an elastomer l as shown in FIG. 3. The elastomer may be coated by a conventional method.

That is, FIG. 3 is a model perspective view including a cross section of the flexible structural material for an air action boat according to the present invention, and in FIG. The periphery of the thread 2 is covered with an elastomer (rubber).

As the thread 2, in addition to cotton and rayon, synthetic fibers such as polyamide, polyester, formalized polyvinyl alcohol, polypropylene, polyacrylonitrile, and aramid fibers, and metal fibers such as stainless steel and steel are used.

In addition, as the elastomer 1, NR, NBR, C12
.

PU, OPR, EPDM, C5M, IIR, PVC
, BR, isoprene (IR), styrene-butadiene copolymer rubber (SBR), polysulfide rubber (TR), and chlorinated polyethylene (CPE).

Alphine rubber (8L), epichlorohydrin rubber (E
A single elastomer or a blend of a plurality of elastomers such as CO), silicone rubber (Si), and fluororubber (PR) can be used.

The flexible structural material for air-action boats of the present invention is shown in FIG.
) and as shown in Figure 2(b), the porosity is 10 to 70.
%, as shown in Figure 3, the elastomer 1 can fully penetrate into the gap between the yarns 2 and 2, causing a rapid separation phenomenon between the woven fabric and the rubber. Hateful.

In this invention, the woven fabric used is limited to hexagonal weave because it can be practically produced and maintains the appropriate stiffness of the woven fabric, which is necessary as a flexible structural material. However, this is because the warp and weft threads restrain each other and propagate and diffuse stress to each other, and the durability is far superior to that of other general rubberized fabrics.

FIG. 4 is a model perspective view including a cross section of a flexible structural material conventionally used as a skirt material or a seal material. In FIG. 4, since there is almost no gap between the threads 2, it is difficult for the elastomer 1 to penetrate between the threads 2. As a simple and quick method for evaluating the flexible structural material for air-action boats, i.e., rubber-coated fabric, obtained in this way, water jets corresponding to the speed of the boat are directly sprayed onto the rubber-coated fabric. There is a method using a WJF (Water Jet Fragilator) test device (Fig. 5) to evaluate (hereinafter referred to as a fraglation test).

In FIG. 5, a rubberized cloth 3 is prepared to have the dimensions and shape shown (unit: mm), and is used as a specimen for the -JF test apparatus for skirt materials or seal materials.

Figure 5 shows the concept of the fraglation test, in which nozzle 5 (cross-sectional size 100 mm x 10 shell) is grounded at an angle of about 65 degrees with respect to the test piece placed vertically. Water jet 4 corresponding to speed
is sprayed onto the specimen.

As a result, rubber peeling, damage, etc. occur in the portion of the specimen to which the water jet 4 is sprayed, and the cut portion 6 further develops. When the portion surrounded by the notch 6 flaps violently, tearing and peeling occur from the lowest end. These peelings, defects, cracks,
The life span is defined as the time until tearing occurs.

Examples and comparative examples are shown below.

[Example, comparative example]

(1), Example 1 A tortoiseshell-knit woven fabric made of 66 nylon with a woven fabric porosity of 45% and a thread (cord) thickness of 840 denier was immersed in a resorcinol formalin latex solution. Fraglation (80 knots) as shown in FIG. 5 was carried out on a rubberized fabric having a thickness of 2.21 coated with an elastomer having the composition shown in FIG.

It was a lifespan.

(Table 1) Injection test (Water speed) The results showed that the elastomer of the composition shown in Table 2 below was immersed in a rubber paste solution dissolved in methyl ethyl getone at a concentration of 10x for 78 hours, and then dried. A 2.2 mm thick rubber coated cloth was subjected to a fraglation test (water jet speed: 80 knots) as shown in Fig. 5. As a result, the life span was 71 hours.

[Table 2] (2), Example 2 An organic elastomer of the composition shown in Table 2 was applied to a hexagonal-knit woven fabric made of 66 nylon with a porosity of 36% and a yarn (cord) thickness of 840 denier. Solvent (3), Example 3 A polyester tortoiseshell-knit woven fabric with a porosity of 50% and a thread (cord) thickness of 1260 denier was treated with a solvent methyl edyl ketone made by T-Aminopropyl Co., Ltd. ) was immersed in a conditioning solution with a concentration of 8Z,
A drying process was performed. 2.4-1-Lylene diisocyanate polyisocyanate and didecanyuace F9-
After mixing p,p'-diaminodiphenylmethane (manufactured by Mitsui Nisso Urethane Co., Ltd.) with a urethane prepolymer consisting of a polyester polyol of 30Y (manufactured by Asahi Denka Co., Ltd.) at the desired ratio, the mixture was immediately applied to the woven fabric subjected to the immersion treatment. Cast and
It was made of rubber-coated cloth with a thickness of 2.5 mm. This rubber-coated fabric was subjected to the fragility test shown in FIG. 5 (jet water velocity: 80 tons), and as a result, it had a lifespan of 84 hours.

(4), Comparative Examples 1 to 3 The results of using woven fabrics with different porosity using the woven fabric type, rubber material, and solution treatment method corresponding to Examples 1 to 3 are shown below for comparison. It is shown in Table 3.

(The following is a blank space) [Effects of the Invention] As described above, this invention has a porosity of woven fabric of 10 to 7.
By using a woven fabric composed of a hexagonal knitted fabric made of 0% elastomer and coated with an elastomer, the woven fabric can be woven with a certain gap between each of the warp and weft yarns. Since the front and back rubbers are in contact with each other, the contact surface between the rubber and the yarn surface of the woven fabric increases, resulting in an increase in adhesive strength.

In addition, in conventional woven fabrics in which the warp and weft yarns are tightly woven, there is a rapid change in the elastic modulus between the woven fabric and the rubber, and stress concentration occurs at the adhesive interface between the two. Although this tends to lead to a peeling phenomenon (that is, short life), such a phenomenon is unlikely to occur in this invention.

That is, even if the adhesive strength between the rubber and the yarn surface of the woven fabric decreases due to repeated bending over a long period of time, the surface of the woven fabric will remain intact.

Since each rubber on the back is in contact with each other, unless the rubber in this area breaks, the rubber layers on the front and back are less likely to fall off, and rapid separation between the woven fabric and the rubber is less likely to occur.

Furthermore, since the warp and weft yarns are alternately intertwined, even if a large amount of stress is applied to the warp yarns, the stress propagates and diffuses to the weft yarns, resulting in less fatigue as a rubberized fabric and a longer life (durability). .

[Brief explanation of drawings]

Figure 1 is an explanatory diagram showing the fiber structure of conventional satin weave, Figure 2
Figure (a) is a model diagram of the hexagonal weave of the woven fabric according to the present invention, Figure 2 (b) is an enlarged view of the hexagonal weave, and Figure 3 is a cross-sectional view of the flexible structural material requiring air traction according to the present invention. Fig. 4 is a model perspective view including a cross section of a flexible structural material conventionally used as a skirt material or sealing material, and Fig. 5 is a fraglation test of a flexible structural material that requires air traction. It is an explanatory diagram showing a method. DESCRIPTION OF SYMBOLS 1... Elastomer, 2... Thread, 3... Rubber coated cloth, 4... Water jet, 5... Nozzle, 6... Notch part.

Claims (1)

[Claims] A flexible structural material for an air cushion boat, characterized in that it is constructed by coating a hexagonal-knit woven fabric with a porosity of 10 to 70% with an elastomer.