JPH106409A - Repaired structure of water proofing cloth and its repairing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water resistance from being impaired since a patch can be easily fusion joined, and bond of a repaired part is strong by a method wherein in a damaged part of a waterproofing cloth, the cloth is bonded to the same kind of waterproofing cloth via a polyester resin of which a melting point for fusion bonding to a coated resin of the cloth is a specific temperature. SOLUTION: In a damaged part of a waterproofing cloth, the cloth is fusion bonded to the same kind of the waterproofing cloth via a polyester rein (a low melting point polyester resin) of which the melting point for fusion bonding to a coated resin of the water proofing cloth is 70 to 200 deg.C. For the low melting point polyester resin, a polyester is formed in a film shape, preferably in a mesh shape or in a nonwoven fabric shape, or is used as an adhesive of a hot melt type. Consequently, through a simple heating pressure fixing implement of an iron or the like is used, heat conductivity and fluidity are improved, melting time can be shortened, and uniform melting can be carried out. Further, METSUKE of the low melting point polyester resin is preferably 20 to 200g/m<2> from the view point of adhesive force.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a repair structure capable of firmly repairing a damaged portion of a waterproof fabric that can be used for industrial materials such as a cold waterproof fabric, a tarpaulin, a tent, and a truck top, and a simple repair. Repair methods that can be used.

[0002]

2. Description of the Related Art Conventionally, in repairing a damaged portion of a waterproof cloth, a waterproof cloth coated with a thermoplastic resin such as a vinyl chloride resin is repaired by hot air fusion, high frequency welder fusion, or sewing by sewing. I have. However, the conventional repair method, that is, hot air fusion, has a drawback that the joining operation is complicated and requires skill, and the joining is likely to be non-uniform. .

On the other hand, in the high-frequency welder fusion, the waterproof cloth is as large as about 1 to 20 m, so that it is difficult to mechanically bond and fuse the central portion, and a high cost is required for the high-frequency welder equipment. There was a disadvantage. In addition, sewing with sewing requires time and effort, and the appearance of the sewing thread is unsightly, and it is difficult to mechanically sew the central part of the waterproof cloth in the same manner as described above. Since the sewing marks of the sewing needle remain, there is a drawback that water pressure, which is one of the important required characteristics of the waterproof cloth, cannot be obtained.

[0004]

DISCLOSURE OF THE INVENTION The present invention has been made in view of the above circumstances, and a waterproof cloth which can easily fuse and bond a patch to a repair part and has a strong adhesion of a repair part and does not impair water resistance. It is an object of the present invention to provide a repair structure and a repair method thereof.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a repair structure for a waterproof cloth according to the present invention has a structure in which a damaged portion of the waterproof cloth is melt-bonded to a coating resin of the waterproof cloth. A waterproofing cloth of the same kind as the waterproofing cloth is fusion-bonded via a polyester resin having a melting point of 70 to 200 ° C. (hereinafter, a low-melting polyester-based resin). Further, the method for repairing a waterproof cloth of the present invention is a method for repairing a damaged portion of the waterproof cloth, wherein a low-melting polyester resin sheet is laminated on the repaired part,
Alternatively, a hot-melt type low-melting polyester resin adhesive is applied, a waterproofing cloth of the same type as the waterproofing cloth is laminated thereon, and then the laminated portion is heated and pressed to melt. .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
The present invention, conventionally, paying attention to various disadvantages when repairing a damaged portion of a waterproof cloth, for example, by a simple method that can be repaired even with a general household iron, and by melting and joining without skill, The present inventors have found that a strong and uniform repair can be performed without impairing the water resistance of the waterproof cloth, and have reached the present invention. That is, a feature of the present invention is that the melting point is 70%.
By simply fusing and joining a polyester resin (hereinafter abbreviated as a low melting point polyester resin) having a temperature of 200 ° C. to 200 ° C., the waterproof pressure of the waterproof cloth is not impaired.

The polyester resin having a low melting point used in the present invention is used by forming the polyester into a film, preferably a mesh or a nonwoven fabric, or as a hot melt type adhesive.

The reason why the low melting point polyester resin used in the present invention is preferably formed in a mesh or nonwoven fabric and used is that when a low melting point polyester resin sheet is melt-bonded with a film-like continuous film, Since the waterproof cloth does not have voids such as mesh and the thickness of the waterproof cloth itself deteriorates the heat conductivity to the sheet and the fluidity becomes uneven, it is a polyester resin with a low melting point. Also takes a long time to melt, resulting in insufficient and uneven melting.
Moreover, as the area of the repaired part increases, the working efficiency further decreases, and furthermore, the area that impairs the water pressure increases, and the water pressure, which is one of the important required properties of the waterproof cloth, is greatly impaired. have.

Therefore, by forming a sheet in which the low-melting polyester resin is formed into a mesh shape or a non-woven fabric, the heat conductivity and the fluidity are improved even when a simple thermocompression bonding device such as an iron is used. , Shorten melting time,
Sufficient and uniform melting becomes possible. In the case of this repair method,
This is effective when there is a relatively large repair part.

When the above repairing method is employed, the repair sheet is formed by maintaining a stable shape by partially hot pressing a mesh or nonwoven web made of a spun yarn of long fibers or short fibers with a low melting point polyester resin. A two-component core-sheath structure in which the long fibers constituting the sheet are composed of the low-melting polyester resin and polyethylene terephthalate, and the polyester resin covers the surface of the polyethylene terephthalate. With this structure, fibrous polyethylene terephthalate remains in the fused portion after repair, and the repaired portion can have a stronger structure.

Further, even for a small repaired part, it is necessary to cut and use a low-melting-point polyester resin sheet in accordance with the size of the part, and there is a part that is not flat due to a fold or the like in the waterproof cloth. In this case, the fusion work becomes difficult. In such a case, by using the low-melting polyester resin as a hot-melt type adhesive,
According to the size and shape of the repaired portion, the polyester resin can be arbitrarily applied in a short time and arbitrarily to facilitate the pressure bonding operation. When this repair method is adopted, it is desirable to use a gun dedicated to hot melt adhesive, and to use a slit nozzle as a nozzle for uniform application.

Of course, it is also possible to repair both the repair method using a low melting polyester resin as a resin sheet and the repair method using a hot melt type adhesive. In addition, the heat compression bonding method when using this repairing method can be performed by simple ironing, but can also be performed by a conventional hot air welding method or a welder welding method.

The low melting polyester resin preferably has a melting point of at least 10 ° C., more preferably 3 ° C., higher than the melting point of a thermoplastic resin such as vinyl chloride coating the waterproof cloth.
A material having a temperature lower than 0 ° C. or higher may be able to simplify the heat bonding operation, for example, the melt bonding operation by ironing. Specifically, the low melting polyester resin is preferably 70
Those having a melting point in the range of 200 to 200 ° C, particularly those having a melting point of 100 to 150 ° C, are more preferable because they form a repair structure of a waterproof cloth that can withstand practical use.

The above-mentioned low-melting polyester resin of the present invention is indispensable to be melt-bonded to a resin covering a waterproof cloth, for example, a vinyl chloride resin. The base resin may be excellent in adhesion to a waterproof cloth and its coating resin, for example, a vinyl chloride resin, a urethane resin, or a polyester resin. Copolymerization components constituting such a saturated polyester resin, terephthalic acid, isophthalic acid, naphthalenedicarboxylic acid, diphenyldicarboxylic acid as aromatic carboxylic acid, adipic acid, azelaic acid, sebacic acid, dodecandioic acid as aliphatic carboxylic acid Etc., trimellitic acid and sulfoxyisophthalic acid as other carboxylic acids, ethylene glycol, propylene glycol, butanediol, pentanediol and the like as dihydric alcohols, diethylene glycol and triethylene glycol as polyether alcohols, Examples include polyethylene glycol and polytetramethylene glycol. In such a copolymer, the copolymer components and the copolymerization ratio can be changed according to the desired melting point and adhesiveness.

[0015] The low-melting polyester resin of the present invention comprises:
If the basis weight of the sheet is 20 g / m ² or less, the adhesive strength between the waterproof cloths is insufficient, and it is difficult to obtain a repair structure that can withstand practical use. If the basis weight of the sheet is 200 g / m ² or more, the repaired portion is heavier than the non-repaired portion, and a load is applied to the repaired portion at the time of use, and repair is required again, which is not preferable. In order to form a repair structure for a waterproof cloth that can withstand practical use, the basis weight of the low-melting polyester resin sheet is preferably 20 to 200 g / m ² . More preferably, it is 70 to 150 g / m ² .

The waterproof fabric of the present invention preferably has a water pressure of not less than 1000 mmH ₂ O, and the base fabric of the waterproof fabric is knitted or woven with synthetic fiber yarns such as polyester fiber, nylon fiber and vinylon fiber. Knitted fabric is used. Polyester fiber is a fiber formed by melt-spinning a polyester obtained by copolymerizing or mixing a third component with polyethylene terephthalate or polyethylene terephthalate as a main component and maintaining the properties of polyethylene terephthalate. Any of spun yarns may be used. An antistatic agent, a flame retardant, a pigment, and the like may be added to the polyester fiber yarn during polymerization or during spinning. Also, the polyester fiber yarn,
The relative viscosity is preferably 1.30 or more, more preferably 1.35 or more. When the relative viscosity is less than 1.30, the strength as a waterproof cloth for industrial materials and the durability under severe conditions are poor, and the basic physical properties required for the waterproof cloth may not be obtained.

The base fabric may be either a woven fabric or a knitted fabric, and can be knitted or woven with a desired structure according to the application. It is also possible to subject the base fabric to processing according to required functions such as dyeing, flame retardancy and water repellency. In particular, those having been subjected to a water-repellent treatment are advantageous because they are often used outdoors. The heating means for fusion used in the present invention may be any means as long as it is thermocompression bonded. Particularly preferably, a simple ironing method may be used.

[0018]

According to the present invention, a low-melting polyester resin sheet is laminated on a damaged portion of a waterproof cloth or a hot-melt type low-melting polyester resin adhesive is applied thereon, and the same kind of the waterproof cloth is formed thereon. After laminating the waterproof cloth, using a repair method of melting the laminated portion by heating and pressing,
The repairing structure can be easily repaired, and the repairing structure obtained by the repairing method is a waterproof cloth in which the repaired portion has strong adhesion and does not impair water resistance.

[0019]

Next, the present invention will be described with reference to examples. In the examples, the evaluation of the waterproof cloth was performed by the following method.

(1) Waterproof pressure A 5 cm x 5 cm hole was made in the center of a waterproof cloth of 25 cm x 25 cm, and a sample repaired with a 7 cm x 7 cm waterproof cloth for a patch was applied on the hole. It was measured according to the method. (2) Adhesive strength JIS-L-10 using a 3 cm wide sample including a heat-pressed part (3 cm long)
96 Tensile strength was measured according to the 6.12.1A method (strip method). (3) Peeling strength According to the T-type peeling strength test method of JIS-K-6854, the peeling strength of the bonded portion was measured with a sample having a width of 3 cm including a heat-pressed portion (3 cm long).

Example 1 A spun yarn of polyester staple fiber having a relative viscosity of 1.38 and a count of 20
A vinyl chloride resin composition having the following composition 1 is woven on a base fabric woven with a warp density of 49 yarns / inch and a weft yarn density of 46 yarns / inch in a flat structure using the twisted yarn as the warp and the 10th yarn as the weft. Dipping and drying at 110 ℃ for 120 seconds and curing
After passing through a heating process at 160 ° C for 30 seconds, the basis weight is 300g / m ²
Was obtained.

[Composition 1]-50 parts of Zeon 121 (vinyl chloride resin paste manufactured by Zeon Corporation)-15 parts of dioctyl phthalate (plasticizer)-15 parts of diisonoyl phthalate (plasticizer)-ADEKA-0-130P 3 Part (epoxy plasticizer manufactured by Adeka Argus Chemical Co., Ltd.) ・ 3 parts KV-62B-4 (barium / zinc based stabilizer manufactured by Kyodo Yakuhin Co., Ltd.) ・ 7 parts antimony trioxide (flame retardant) ・ Calcium carbonate ( 7 parts

The waterproof cloth 1 is cut into a size of 25 cm square, a hole of 5 cm square is made at the center, and the waterproof cloth 1 of 7 cm square is laminated thereon, and the basis weight is 70 g / m ^2. , A saturated polyester resin having a mesh size of 4 × 4 mm and a melting point of 100 ° C. (388 parts of dimethyl terephthalate,
258 parts of 1,2-propylene glycol, ethylene glycol
36 parts, 2.7 parts of trimethylolpropane, 0.5 parts of antioxidant “Irganox 1330” manufactured by Ciba-Geigy, and 0.068 parts of tetrabutyl titanate were charged into an autoclave.
Transesterification was carried out at ~ 200 ° C for 5 hours, 160 parts of 2-exchanged polypropylene glycol having a number average molecular weight of 1200 was charged, and then the reaction system was evacuated to 5 mmHg over 20 minutes.
The temperature was raised to 50 ° C, and a mesh-like low-melting resin sheet with an outer frame of 7 cm square and an inner frame of 5 cm square consisting of a resin obtained by performing a polycondensation reaction at 0.1 mmHg and 250 ° C for 60 minutes was further inserted. The model of the repaired structure of Example 1 was produced by fusion bonding by ironing at a temperature of about 150 ° C. and a compression time of about 15 seconds.

Examples 2 to 4 In place of the saturated polyester resin having a melting point of 100.degree. C. used in Example 1, a saturated polyester resin having a melting point of 120.degree. C., 130.degree. When the composition ratio of the polyester resin is dimethyl terephthalate:
1,2-propylene glycol = 390 parts: 255 parts, 392 parts: 257
Parts, 394 parts: resin obtained by changing to 259 parts), and models of repair structures of Examples 2 to 4 were produced in the same manner as in Example 1.

Example 5 70 parts of dimethyl terephthalate, 30 parts of sebacic acid, 55 parts of ethylene glycol and 45 parts of neopentyl glycol were randomly polymerized to have an intrinsic viscosity of 0.7, a glass transition point of 5 ° C.,
A transparent polyester polymer having a melting point of 150 ° C. was obtained.
The above polymer and 8 parts of a polyethylene oxide adduct of octyl alcohol (HLB value 17.0) were mixed in a nitrogen stream,
The mixture was melted with stirring at 200 ° C. The mixed melt was dropped into 60 parts of a 1% aqueous solution of ethanolamine at room temperature while stirring. This emulsified dispersion is translucent and has a viscosity
10 cps. In addition, SN was added to the dispersion as a viscosity modifier.
-10 parts of Thickener A-804 (anionic and nonionic special surfactant, manufactured by San Nopco Co., Ltd.) was added to obtain a copolymerized polyester emulsified dispersion having a solution viscosity of 5000 cps.

A warp density of 49 yarns / inch and a weft yarn density of 46 yarns / inch in a flat structure using two twisted yarns of a polyester staple fiber having a relative viscosity of 1.38 as two warps and tenth yarns as wefts. Dipping the above copolyester emulsified dispersion onto a base fabric woven in, and passing it through a heating step of 110 ° C x 120 seconds in a drying step and 160 ° C x 30 seconds in a curing step,
Weight per unit area was obtained waterproof cloth 2 of 300g / m ^2.

The waterproof cloth 2 is cut into a size of 25 cm square, a hole of 5 cm square is formed at the center, and the waterproof cloth of 7 cm square is laminated thereon, and the basis weight is 70 g / m ² , Insert a mesh-like low melting point resin sheet with a mesh size of 4 x 4 mm and a 7 mm square outer frame and a 5 cm square inner frame made of a saturated polyester resin with a melting point of 100 ° C.
The model of the repaired structure of Example 5 was produced by fusion bonding by ironing at 50 ° C. and a compression time of about 15 seconds.

Example 6 The above-mentioned waterproof cloth 1 was cut into a size of 25 cm square and 5 cm in the center.
Drill four holes and make a 2cm width along the inside edge of the hole, melting point
A hot-melt low-melting polyester resin adhesive at 120 ° C is applied using a hot-melt gun equipped with a slit nozzle, and a 9 cm square waterproof cloth 1 is laminated thereon. The model of the repaired structure of Example 6 was produced by fusion bonding by ironing at about 15 ° C. and a compression time of about 15 seconds.

Comparative Example 1 The above-mentioned waterproof cloth 1 was cut into a size of 25 cm square.
Drill a hole on each side, and place a 7cm square waterproof cloth on it.
Then, to prevent the vinyl chloride resin from fusing and adhering to the iron, laminate one release paper on the surface to be ironed, heating temperature about 180 ° C, compression time about
A repair structure model of Comparative Example 1 was produced by fusion bonding by ironing for 15 seconds. However, the vinyl chloride resin flowed and became unsightly in appearance.

Comparative Example 2 The waterproof cloth 1 was cut into a size of 25 cm square and 5 cm in the center.
A four-hole was made, a waterproof cloth 1 of 7 cm square was laminated on the hole, and hot air of about 300 ° C. was blown as it was to fuse and bond it, thereby producing a repair structure model of Comparative Example 2. However, shrinkage occurred at the joint, and the appearance was unsightly.

Comparative Example 3 The above-mentioned waterproof cloth 1 was cut into a size of 25 cm square and 5 cm in the center.
Drill a hole on each side, layer the waterproof cloth 1 of 7 cm square on top of it, and apply a polyamide resin with a basis weight of 70 g / m ² , a mesh size of 4 x 4 mm, and a melting point of 100 ° C in the middle. (388 parts of dimethyl terephthalate, 44 parts of 1,2-propylene glycol, 323 parts of ethylene glycol, 2.7 parts of trimethylolpropane, 0.5 parts of antioxidant "Irganox 1330" manufactured by Ciba Geigy, 0.5 part of tetrabutyl titanate 0.0
68 parts were charged into an autoclave and transesterification was carried out at 170-200 ° C. for 5 hours. 160 parts of 2-exchanged polypropylene glycol having a number average molecular weight of 1200 was charged. Then, the reaction system was evacuated to 5 mmHg over 20 minutes, and then reduced to 250 ° C. Raise the temperature,
Further, a 7 cm square outer frame and a 5 cm square inner frame made of a resin obtained by performing a polycondensation reaction at 0.1 mmHg and 250 ° C. for 60 minutes are inserted, and the heating temperature is about 150 ° C. and the compression time is about Comparative example 3 by fusion bonding by ironing for 15 seconds
A model of the repair structure was made. Table 1 shows the performance evaluation results of Examples 1 to 6 and Comparative Examples 1 to 3.

[0032]

[Table 1]

As is evident from Table 1, Examples 1 to 6 have water resistance sufficient for practical use and also have excellent mechanical strength such as adhesive strength and peel strength. In contrast, in the case of Comparative Examples 1 and 2, the mechanical strength was sufficient, but the appearance was unsightly and the water resistance was poor in practicality. Also, in the case of Comparative Example 3, although the water resistance had a certain level of performance, the mechanical strength was very weak.

[0034]

According to the present invention, a damaged portion of a waterproof cloth can be repaired into a strong and uniform fusion bonding structure by a simple heat treatment method, for example, ironing, without impairing water resistance. .

Claims (7)

[Claims] 1. A waterproof cloth of the same type as that of the waterproof cloth is bonded to a damaged portion of the waterproof cloth via a polyester resin having a melting point of 70 to 200 ° C. which is melted and bonded to a coating resin of the waterproof cloth. Repair structure of waterproof cloth characterized by the following. 2. The repair structure for a waterproof cloth according to claim 1, wherein the fusion-bonded portion has a water pressure of not less than 1000 mmH ₂ O. 3. The repair structure for a waterproof cloth according to claim 1, wherein the polyester resin is a saturated polyester. 4. A method of repairing a damaged portion of a waterproof cloth, wherein a sheet made of a polyester-based resin having a melting point of 70 to 200 ° C., which is melted and joined to a coating resin of the waterproof cloth, is laminated on the repaired portion. A method for repairing a waterproof cloth, comprising laminating a waterproof cloth of the same kind as the waterproof cloth, and then heat-pressing and fusing the laminated portion. 5. The method for repairing a waterproof cloth according to claim 4, wherein the polyester resin sheet is a mesh sheet or a nonwoven fabric. 6. A polyester resin sheet having a basis weight of 20.
To 200 g / m ² and is claim 4 or method of repairing a tarpaulin to claim 5, wherein. 7. A method for repairing a damaged portion of a waterproof cloth, wherein the repaired portion is coated with a hot melt type polyester adhesive having a melting point of 70 to 200 ° C. for melting and joining with a coating resin of the waterproof cloth. A method of repairing a waterproof cloth, comprising laminating a waterproof cloth of the same kind as the waterproof cloth, and then heat-pressing and fusing the laminated portion.