JPH07329876A - Rubber boat with sealant structure and its manufacture - Google Patents

Abstract

PURPOSE:To reinforce a defective part inside of an air drum and lengthen its longevity by providing a continuous sealant layer consisting of aqueous latex inside of each air drum divided parts on a rubber boat installed with a ship's bottom part on an air drum furnished with an air injection hole for each of the divided parts divided into a plural number of pieces. CONSTITUTION:An air drum part of a rubber boat is divided into a plural number, for example, into two pieces, and air injection holes (a), (b) are provided on each of divided parts A, B which are made independent airtight chambers. The air drum in such structure is formed in a cylindrical body by connecting one or a plural number of rubber sheet base materials 1 at a peripheral edge 2, for example, and reinforcing them with an airtight tape 3 and a decorative tape 4, and the air injection hole (a) is arranged at a proper point. In this case, self-hardenable aqueous latex is introduced from the air injection hole (a) into the cylindrical body, and by hardening it after it flows and spreads around the whole surface along an inwall, a continuous sealant layer 5 is formed. This continuous sealant layer 5 is set in a range of 10-100mum in thickness.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air boat having an improved body so that internal air does not leak from a defective portion generated during a manufacturing process during use.

[0002]

2. Description of the Related Art In recent years, the number of marine sports enthusiasts has increased dramatically, and one of them has been the river rafting by a rubber boat. This rubber boat for going down the river usually has a bottom of an air mat attached to a ring-shaped body, but at the time of manufacturing the body, a defect is made at the joint of the rubber sheet and the part where the air injection hole is attached. It is liable to occur, and internal air may leak from it during use, which may cause an accident.The rubber sheet used as a material has parts with uneven strength, and it may crack from outside due to impact. It may open and become unusable.

In order to remedy such a defect, it has been attempted to apply an adhesive liquid over the entire outer surface of the prepared cavity and dry it to reinforce it. With regard to, because we cannot respond appropriately, we cannot always obtain satisfactory results. Further, such coating on the outside has the disadvantage that the coating liquid is consumed in a large amount and the original color tone of the material is impaired.

[0004]

SUMMARY OF THE INVENTION The present invention provides a rubber boat having a body which has been treated so as to be effectively reinforced with the use of a small amount of coating solution and which has no adverse effect on the appearance. It was made for the purpose.

[0005]

DISCLOSURE OF THE INVENTION As a result of intensive research conducted by the present inventor to develop a rubber boat that is reinforced so as not to be easily damaged, a continuous sealant layer is formed on the inner wall of the cavity forming the rubber boat. It has been found that the object can be achieved thereby, and the present invention has been completed based on this finding.

That is, according to the present invention, in a rubber boat in which a ship bottom is attached to a body which is divided into a plurality of portions and has an air injection hole for each divided portion, a continuous sealant made of an aqueous latex is provided inside each divided portion of the body. A rubber boat having a layer is provided.

Generally, as shown in the plan view of FIG. 1, the inflatable portion of the rubber boat is divided into a plurality of pieces, for example, two pieces, and each divided portion, A and B, are independent airtight chambers. And air injection holes a and b are attached to each of them. In the present invention, it is necessary to use a cavity provided with a continuous sealant layer inside each of the divided portions.

The air cylinder having such a structure is formed into a cylindrical body having both ends closed by joining one or a plurality of rubber sheet base materials at the peripheral edge, and after providing air injection holes at appropriate positions. After introducing the self-hardening aqueous latex into the tubular body through this air injection hole, and casting the entire surface along the inner wall,
It can be obtained by curing and forming a continuous sealant layer. At this time, the thickness of the continuous sealant layer formed is preferably in the range of 20 to 100 μm.

FIG. 2 is a sectional view of an air cylinder having a continuous sealant layer formed in this manner. A rubber sheet base material 1 is polymer-bonded at its peripheral edge 2, and an airtight tape 3 and a decorative tape 4 are used. The reinforced cylindrical body constitutes the divided portion of each air cylinder, and the continuous sealant layer 5 is formed on the inner wall thereof. The bonding of the rubber sheet base material is performed by bonding with an adhesive, welding by high frequency heating, stitching, or the like. In any case, the strength of the bonded portion is often lower than that of other portions. Further, the air injection hole a is provided by punching it in an appropriate place of the cylindrical body, fitting the air injection hole base portion, and fixing it with an adhesive or the like, but it is not uniform with the rubber sheet base material. May occur, and it may be damaged during long-term use, causing air leakage.

In the body part of the rubber boat of the present invention, the self-hardening aqueous latex is introduced from the air injection hole, and while the whole is turned around uniformly, the aqueous latex is cast down to the details. Reinforcement is effectively performed by intensively filling a portion where internal defects are likely to occur, such as a joint portion of a base material or a mounting portion of an air injection hole.

At this time, the aqueous latex used for forming the continuous sealant layer is self-curing, that is, by the reaction of the components in the coating liquid composition with each other, or the components in the composition and oxygen and moisture in the air. Any one can be used as long as it spontaneously hardens by the reaction or spontaneously hardens by volatilization of the solvent.

Examples of such materials include natural rubber type, chloroprene rubber type, styrene-butadiene rubber type,
Examples of the aqueous latex include polyisoprene-based, polybutadiene-based, acrylonitrile-butadiene-based, and methylmethacrylate-butadiene-based latex. It is desirable that these aqueous latexes have a viscosity of about 5 to 10 poises in order to sufficiently spread them inside the cavity.

The thicker the continuous sealant layer is, the more the reinforcing effect is improved, but it is disadvantageous in terms of economy and workability that it is not so thick, and if it is too thin, the desired reinforcing effect is obtained. Since it cannot be obtained, it is preferably in the range of 10 to 100 μm.

As described above, the use period of the rubber boat can be extended by 2 to 5 times by using the air cylinder reinforced from the inside.

[0015]

EXAMPLES The present invention will be described in more detail with reference to examples.

Example 1 An aqueous solution having the following composition on each inner wall of a two-passenger rubber boat (FR-500 Hypalon specification made by Okamoto) having a total length of 210 cm and a total width of 123 cm having an air cylinder (tube diameter 30 cm) consisting of two air chambers. Using latex, average thickness 20
A continuous sealant layer of μm was formed. Aqueous latex composition Ingredient content (parts by weight) Natural rubber latex (rubber content: 60 wt%) 100.0 colloidal sulfur 1.5 Zinc white 0.5 2-mercaptobenzothiazole zinc salt [Kawaguchi Chemical Co., Ltd., pressurized Sulfurization accelerator MZ] 0.2 Dimethyldithiocarbamate zinc salt [Kawaguchi Chemical Co., Ltd., vulcanization accelerator PZ] 0.6 Polyethylene glycol (Hercules water-soluble resin picopeel) 10.0 Stabilizer casein (Daily Thickening agent manufactured by Board Co., Ltd. 0.2 Higher alcohol sulfuric acid ester (Voltamol dispersant manufactured by Basque Co., Ltd.) 0.2 Ammonia water 1.0

An accelerated fracture test was conducted on the rubber boat thus obtained and a rubber boat not provided with a continuous sealant layer. As a result, the durability period of the former was about 2-3 times that of the latter.

Example 2 An average thickness of 30 was obtained by using the same latex of the same rubber boat as that used in Example 1 but using an aqueous latex having the following composition.
A continuous sealant layer of μm was formed. Aqueous latex composition Ingredient content (parts by weight) Natural rubber latex (rubber content: 60 wt%) 100.0 colloidal sulfur 1.5 Zinc white 0.5 2-mercaptobenzothiazole zinc salt [Kawaguchi Chemical Co., Ltd., pressurized Sulfurization accelerator MZ] 0.2 Dimethyldithiocarbamate zinc salt [Kawaguchi Chemical Co., Ltd., vulcanization accelerator PZ] 0.6 Polyethylene glycol (Hercules water-soluble resin picopeel) 10.0 Stabilizer casein (Daily Thickener made by Board Co., Ltd. 0.2 Higher alcohol sulfuric acid ester (Voltamol dispersant made by Basque Co., Ltd.) 0.2 Methylcellulose [thickener made by Matsumoto Resin Co., Ltd.] 0.2 Ammonia water 1.0

[0019]

INDUSTRIAL APPLICABILITY The rubber boat according to the present invention can be remarkably extended in its service life as a result of the defective portion inside the body being reinforced without affecting the appearance.

[Brief description of drawings]

FIG. 1 is a plan view of a body portion of a rubber boat.

FIG. 2 is a sectional view of an example of the present invention.

[Explanation of symbols]

 1 Rubber Sheet Base Material 2 Peripheral Joint 3 Continuous Sealant Layer

Claims (4)

[Claims] 1. A rubber boat in which a ship bottom is attached to a body which is divided into a plurality of parts and has an air injection hole for each divided part, wherein a continuous sealant layer made of an aqueous latex is provided inside each divided part of the body. Inflatable boat characterized by. 2. The thickness of the continuous sealant layer is 10 to 100.
The rubber boat according to claim 1, which is in the range of μm. 3. A method for manufacturing a rubber boat which is divided into a plurality of parts, each of which has an air injection hole, and a bottom of which is attached to the air cylinder to manufacture a rubber boat. Is formed into a cylindrical body having one or more rubber boat base materials joined at the peripheral edge and closed at both ends, and an air injection hole is arranged at an appropriate position, and then the aqueous latex is cylindrically formed through the air injection hole. A method for producing a rubber boat having a continuous sealant layer, characterized by being introduced into a body, cast over the entire surface along an inner wall and then cured to form a continuous sealant layer. 4. A continuous sealant layer having a thickness of 10 to 100 μm.
The manufacturing method according to claim 3, which is formed in m.