JP2010106930A - Hose and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly productive hose capable of reducing the amount of solvent to be used when manufacturing it without causing delamination between layers due to insufficient adhesive force, and to provide a method of manufacturing the hose. <P>SOLUTION: The hose 10 includes an inner layer 1 formed of a resin, a reinforcing layer 3 provided outside the inner layer 1, and an outer layer 2 formed of a resin and provided outside the reinforcing layer 3, the inner layer 1 and the reinforcing layer 3, the outer layer 2 and the reinforcing layer 3, or both of them being adhered to each other with non-solvent type hot melt urethane adhesive. The method of manufacturing the hose 10 is also provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hose with low environmental impact during production and improved productivity, and a method for producing the hose.

  Conventionally, a hose comprising an inner layer, a reinforcing layer provided outside the inner layer, and an outer layer provided outside the reinforcing layer has been widely used. And in such a hose, as a method of integrally bonding the inner layer or outer layer and the reinforcing layer, a method of interposing an adhesive diluted with a solvent between the inner layer or the outer layer and the reinforcing layer, or a resin on the surface of the reinforcing layer For example, a method of directly coating and forming an outer layer is used.

Specifically, it is a hose in which an outer surface layer made of a thermoplastic resin is laminated on the outside of a fiber reinforcement layer in which an inner layer made of a thermoplastic resin is laminated on the inside, and the surface of the fiber reinforcement layer preheated by the outer layer A hose characterized by being directly coated with a molten thermoplastic resin (see, for example, Patent Document 1), a resin tube having a nylon tube, an organic fiber reinforcing layer, and a thermoplastic resin cover. The nylon tube and the organic fiber reinforcing layer are bonded with an adhesive obtained by diluting a one-component moisture-curable adhesive made of a urethane prepolymer with a solvent (for example, a patent document) 2), etc. are known.
JP-A-6-55658 Japanese Patent Publication No. 6-15913

  However, in the conventional hose in which the outer layer is formed by directly coating the molten resin on the reinforcing layer without using an adhesive, the adhesive force between the outer layer and the reinforcing layer is not sufficient. There was a risk of peeling.

  On the other hand, in the conventional hose using the adhesive diluted with the solvent, although sufficient adhesive force between the layers can be ensured, the load on the environment is large because the solvent is used at the time of manufacture. Further, if the outer layer is formed before the solvent is volatilized, foaming of the outer layer resin occurs. Therefore, it is necessary to form the outer layer after volatilizing the solvent, and the productivity is low. Furthermore, since the reinforcing fiber is impregnated with the liquid adhesive diluted with the solvent, there is a problem that the hardness of the reinforcing fiber itself is increased and the bending rigidity of the hose is increased.

  Therefore, there has been a demand for a highly productive hose and a method for producing the hose that do not cause delamination due to insufficient adhesive force and can reduce the amount of solvent used during production.

  This invention aims to solve the above-mentioned problem advantageously, and the hose of the present invention comprises an inner layer made of a resin, a reinforcing layer provided outside the inner layer, a resin, and In a hose comprising an outer layer provided outside the reinforcing layer, the inner layer and the reinforcing layer, or the outer layer and the reinforcing layer, or both are bonded with a solventless hot melt urethane adhesive. It is characterized by that. In this way, if a solventless hot melt urethane adhesive is used for bonding between the inner layer and the reinforcing layer, or bonding between the outer layer and the reinforcing layer, the amount of solvent used at the time of production can be reduced. The load given to the environment at the time of manufacture can be reduced while securing the adhesive force. In addition, since a solventless adhesive is used, there is no risk of foaming of the outer layer resin due to the non-volatile solvent even if the outer layer or the like is bonded immediately after application of the adhesive. Since it is not necessary to provide a drying time (drying process) for volatilizing the solvent later, productivity can be improved. Furthermore, an unnecessary increase in the bending rigidity of the hose due to the impregnation of the reinforcing layer with the adhesive can also be prevented. Here, from the viewpoint of reducing environmental load and improving productivity, it is preferable to use a solventless hot melt urethane adhesive for both the adhesion between the inner layer and the reinforcing layer and the adhesion between the outer layer and the reinforcing layer. In the present invention, the solventless hot melt urethane adhesive is solid at room temperature (25 ° C.), but is liquefied by heating and melting and can be applied to an adherend, and The term refers to a urethane-based thermoplastic adhesive that can be solidified by cooling and moisture absorption after application to form a bond between adherends.

  Here, in the hose of the present invention, the solventless hot melt urethane adhesive preferably has a softening temperature of 130 ° C. or lower and a melt viscosity at 110 to 130 ° C. of 5000 to 10,000 mPa · s. . When the softening temperature (softening point) is 130 ° C. or lower, preferably 110 to 130 ° C., the inner layer and the reinforcing layer are hardly affected by heat when the solventless hot melt urethane adhesive is applied, and the temperature is 110 to 130. If the melt viscosity at 5000C is 5000 to 10000 mPa · s, it becomes easy to uniformly apply the solventless hot melt urethane adhesive. The melt viscosity is a value measured in accordance with JIS K6862.

  In the hose of the present invention, the solventless hot-melt urethane adhesive is preferably applied with a thickness of 0.01 to 0.1 mm. This is because if the coating thickness of the solventless hot melt urethane adhesive is thinner than 0.01 mm, the coating operation becomes difficult, and if it is thicker than 0.1 mm, the peel strength between the layers of the hose is lowered. Moreover, it is because the softness | flexibility of a hose can be ensured by apply | coating a solventless type hot-melt urethane adhesive uniformly with a thickness of 0.01-0.1 mm.

  In the hose of the present invention, the outer layer is preferably made of a polyurethane resin, and the inner layer is preferably made of a polyester resin or a polyamide resin. From the viewpoint of compatibility with the solventless hot melt urethane adhesive, the inner layer is particularly preferably made of a polyester resin.

  The hose manufacturing method of the present invention includes a step of forming a resin into a tubular shape as an inner layer, a step of providing a reinforcing layer outside the inner layer, and a step of providing an outer layer made of resin outside the reinforcing layer. The reinforcing layer and / or the outer layer are provided by bonding using a solvent-free hot melt urethane adhesive, and the bonding is performed on the bonding surface with the solvent-free hot-melt urethane adhesive. It is performed immediately after application of the mold hot melt urethane adhesive. Thus, if a non-solvent hot melt urethane adhesive is used for bonding the inner layer and the reinforcing layer, or bonding the outer layer and the reinforcing layer, a drying time for volatilizing the solvent after application of the adhesive should be provided. Since the reinforcing layer and the outer layer can be provided without any problem, the time required for manufacturing the hose can be reduced and the productivity can be improved as compared with the method for manufacturing the hose using the adhesive diluted with the solvent. Furthermore, since the amount of the solvent used in the manufacturing process can be reduced, it is possible to reduce the load exerted on the environment during manufacturing while ensuring a sufficient adhesive force between the layers of the hose. Moreover, the hose manufactured according to this manufacturing method can prevent an unnecessary increase in the bending rigidity of the hose due to the impregnation of the reinforcing layer with the adhesive.

  According to the present invention, by using a solvent-free hot melt urethane adhesive, there is no delamination between layers due to insufficient adhesive force, and the amount of solvent used during production can be reduced, resulting in high productivity. A hose can be provided. Moreover, the manufacturing method of such a hose can be provided.

  Below, the hose of this invention is demonstrated in detail. This hose is characterized in that an inner layer and a reinforcing layer, or an outer layer and a reinforcing layer, or both are bonded with a solventless hot melt urethane adhesive. In the hose of the present invention, it is preferable that both the inner layer and the reinforcing layer, and the outer layer and the reinforcing layer are bonded with a solventless hot-melt urethane adhesive from the viewpoint of reducing environmental burden and improving productivity.

<Inner layer and outer layer>
For the inner and outer layers used in the present invention, ordinary hose compounds such as polyurethane resins, polyester resins, polyamide resins, polyolefin resins, and other thermoplastic resins and compositions thereof are formed into a tubular shape according to a conventional method. Can be used. Here, a polyurethane resin is preferably used for the outer layer, and a polyester resin or a polyamide resin is preferably used for the inner layer.

<Reinforcing layer>
In addition, the reinforcing layer used in the present invention can be made of a braided fiber material such as nylon, polyester, vinylon, aramid, rayon, aromatic polyamide, cotton, etc., particularly polyester fiber, vinylon fiber. It is preferable to use an aramid fiber.

<Solvent-free hot melt urethane adhesive>
As the solventless hot-melt urethane adhesive used in the present invention, any hot-melt urethane adhesive that is not diluted with a solvent can be used. In particular, the softening temperature is 130 ° C. or less, and 110 to 130 ° C. Those having a melt viscosity of 5,000 to 10,000 mPa · s can be suitably used. Specifically, Dickite H-930 (softening temperature: 125 ° C., viscosity at softening temperature: 3000 to 9000 mPa · s) manufactured by Dainippon Ink & Chemicals, Inc., Tyforce H-1041 (softening temperature: 125 ° C., Known polyols and polyisocyanates, including commercial products such as viscosity at softening temperature: 5000 to 10000 mPa · s), Tyforth FH-110 (softening temperature: 125 ° C., viscosity at softening temperature: 8000 to 12000 mPa · s) A hot melt urethane adhesive made of a polyurethane composition obtained by a reaction method such as bulk reaction, solution reaction, non-aqueous dispersion reaction, or aqueous dispersion reaction can be used. In addition, when a polyurethane composition is produced by a reaction system using a solvent, a solventless hot melt urethane adhesive can be obtained by removing the solvent after the reaction.

  Here, the polyol is not particularly limited, and polyester polyol, polyether polyol, polyester ether polyol, a mixture thereof, and the like can be used. Specifically, as the polyester polyol, for example, ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,3-butanediol, 1,4-butanediol, 2,2-dimethyl- 1,3-propanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,8-octanediol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, cyclohexane-1, One or more polyhydric alcohols such as 4-diol, cyclohexane-1,4-dimethanol, glycerin, trimethylolpropane, trimethylolethane, hexanetriol, pentaerythritol, sorbitol, methylglycoside Acid, adipic acid, glutaric acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, phthalic anhydride, tetrahydrophthalic anhydride, glutaric anhydride, maleic anhydride, anhydrous A polybasic acid such as maleic acid or hexahydroisophthalic acid or a condensate with one or more of acid anhydrides can be used. Examples of the polyether polyol include one or two of the above polyols. A single or two or more ring-opening polymers such as ethylene oxide, propylene oxide, butylene oxide, styrene oxide, tetrahydrofuran and the like having an initiator of at least one species can be used. Examples of the polyester ether polyol include the polyester Polyol and poly Etc. One or copolymer of a polyol selected from the two or more chromatography ether polyol may be used.

  Further, the polyisocyanate is not particularly limited, and aromatic diisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate, phenylene diisocyanate, hexamethylene diisocyanate, lysine diisocyanate, cyclohexane diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate. , Xylylene diisocyanate, aliphatic or alicyclic diisocyanates such as tetramethyl xylylene diisocyanate, triphenylmethane triisocyanate, polyphenyl polymethylene polyisocyanate, polyisocyanate having carbodiimide group, polyisocyanate containing allophanate group, isocyanurate Group included Or the like can be used polyisocyanate.

<Hose>
The hose of the present invention whose one embodiment is shown in FIG. 1 is manufactured using the above-described inner layer, outer layer, reinforcing layer, and solventless hot melt urethane adhesive without particular limitation, for example, as follows. be able to.

  First, after forming the inner layer 1 by extruding the above-described resin into a tubular shape with an extruder, a solventless hot-melt urethane adhesive obtained by heating and melting the outer peripheral surface of the inner layer 1 to a temperature equal to or higher than the softening temperature is, for example, 0. Apply using a coating machine with a uniform thickness of 01-0.1 mm. Then, immediately after the solventless hot melt urethane adhesive is applied, the reinforcing layer 3 is formed and adhered by braiding the fiber material on the outer peripheral surface of the inner layer 1 with a braiding machine. Next, the solventless hot melt urethane adhesive heated to the softening temperature or higher and melted is applied to the outer peripheral surface of the reinforcing layer 3 with a uniform thickness of, for example, 0.01 to 0.1 mm by using a coating machine. Immediately after that, the outer layer 2 is formed into a tubular shape on the reinforcing layer 3 by an extruder and bonded to form a hose 10.

  In the above aspect, the solvent-free hot melt urethane adhesive is used for both the adhesion between the inner layer and the reinforcing layer and the adhesion between the outer layer and the reinforcing layer. One may be bonded using other bonding means such as a solvent-type adhesive or welding.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

Example 1
After forming the inner layer by extruding a polyurethane resin into a tubular shape with an extruder, a solventless hot-melt urethane adhesive (Deck Tight H-930, manufactured by Dainippon Ink & Chemicals, Inc., softening temperature is used. 125 ° C., 125 ° C. and a viscosity of 3000 to 9000 mPa · s) was applied to the outer peripheral surface of the inner layer with a thickness of 0.05 mm. Immediately after applying the solventless hot melt urethane adhesive, polyester fibers were braided on the outer peripheral surface of the inner layer with a braiding machine to form and adhere a reinforcing layer. Next, a solvent-diluted urethane-based adhesive (product of Road Far East INC, Tylite 7411) is applied to the outer peripheral surface of the reinforcing layer with an applicator, and then an outer layer made of polyester resin is formed into a tubular shape on the reinforcing layer with an extruder. -Bonded to make a hose. And about the produced hose, the following method evaluated the presence or absence of foaming of an outer layer, the time required for drying of an adhesive agent, bending rigidity, and workability.

(Example 2)
Implemented except that the solventless hot melt urethane adhesive was changed to "Tyforce H-1041" (Dainippon Ink Chemical Co., Ltd., softening temperature 125 ° C, viscosity 5000 to 10000 mPa · s at 125 ° C) A hose was produced in the same manner as in Example 1 and evaluated.

(Example 3)
A hose was prepared and evaluated in the same manner as in Example 1 except that the coating thickness of the solventless hot melt urethane adhesive was 0.1 mm.

(Comparative Example 1)
A hose was produced and evaluated in the same manner as in Example 1 except that a solvent-diluted urethane-based adhesive (manufactured by Road Far East INC, Tylite 7411) was used instead of the solventless hot-melt urethane adhesive.

(Drying time)
When the solvent of the adhesive was dried during the production of the hose, the time required for drying was measured.

(Bending rigidity)
The bending rigidity of the hose was measured with a push-pull gauge and evaluated. A sample having good bending rigidity was indicated as “◯”, and a medium value as “△”.

(Processability)
The processability at the time of hose manufacture was evaluated. Those with good workability were marked with “◯”, and those with medium workability were marked with “△”.

It is a front view which cuts and shows a part about the hose of 1 aspect of this invention.

Explanation of symbols

1 Inner layer 2 Outer layer 3 Reinforcement layer 10 Hose

Claims (6)

In a hose comprising an inner layer made of resin, a reinforcing layer provided outside the inner layer, and an outer layer made of resin and provided outside the reinforcing layer,
The hose characterized in that the inner layer and the reinforcing layer, or the outer layer and the reinforcing layer, or both are bonded with a solventless hot melt urethane adhesive.   2. The hose according to claim 1, wherein the solventless hot-melt urethane adhesive has a softening temperature of 130 ° C. or lower and a melt viscosity at 110 to 130 ° C. of 5000 to 10000 mPa · s. .   The hose according to claim 1, wherein the solventless hot-melt urethane adhesive is applied with a thickness of 0.01 to 0.1 mm.   The hose according to claim 1, wherein the outer layer is made of a polyurethane resin.   The hose according to claim 1, wherein the inner layer is made of a polyester resin or a polyamide resin. Forming a resin into a tubular shape to form an inner layer;
Providing a reinforcing layer outside the inner layer;
Providing an outer layer made of resin on the outside of the reinforcing layer;
In the manufacturing method of the hose containing
The reinforcing layer or the outer layer, or both are provided by adhering using a solventless hot melt urethane adhesive,
The manufacturing method according to claim 1, wherein the bonding is performed immediately after the solvent-free hot-melt urethane adhesive is applied to the bonding surface.

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