JPS60113882A - Rubber tubular article - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to rubber tubular articles such as rubber hoses and rubber couplings in which a plastic film is laminated to rubber, and more specifically, the present invention relates to rubber tubular articles such as rubber hoses and rubber couplings in which a plastic film is laminated to rubber. A polyamide resin or polyester resin film having a softening point in the vulcanization temperature range treated with an adhesive comb mainly composed of a formaldehyde generator and vinylpyridine-butadiene-styrene copolymer rubber is made into an unvulcanized rubber tube. It relates to a rubber tubular product that is laminated onto a material body and bonded by vulcanization.

Rubber surfaces do not necessarily exhibit strong resistance to chemical loads such as organic solvents. For this reason, the conventional methods for improving the organic solvent resistance of rubber have been (1) using a rubber material with a polarity different from that of the solvent, (2) increasing the degree of crosslinking of the comb,
Methods such as (3) increasing the amount of filler and (4) increasing the amount of rubber used and wall thickness have been taken.

However, each of these methods has the following disadvantages. That is, method (1) uses chloroprene rubber (
CR), butadiene-acrylonitrile rubber (NBR
), acrylic rubber, epichlorohydrin rubber, fluororubber, and other expensive rubbers are required, and method (2) requires
There is a problem that the flexibility and bending resistance of the rubber are impaired, and its effectiveness is limited. Furthermore, method (3) has limitations in terms of processability and physical properties, and the effect of improving solvent resistance is at most proportional to the volume fraction of the filler. Furthermore, in method (4), increasing the wall thickness increases the number of product bases, resulting in an increase in cost and
There are problems such as loss of product flexibility.

In addition, isobutylene isoprene copolymer rubber (IIR), which has a low resistance to gas permeation and is said to have good gas permeation resistance among combs, has a resistance of 02"2 compared to nylon 6. The permeability is about 1/30 to 1/40, and for butadiene rubber (BR) it is 1150.
It is 0 to 1/600.

Furthermore, rubber materials contain anti-aging agents, vulcanizing agents, vulcanization accelerators,
Many chemicals such as oil are mixed in, and when rubber products are used, some of these may leak out of the rubber, polluting the environment and causing problems such as the physical properties of the rubber being deteriorated due to the spillage. There is.

Moreover, the rubber surface has a large coefficient of friction, and there is a large resistance when liquid flows over it. For this reason, for example, when fluid moves inside a rubber tube, pressure loss occurs along the way, which is a problem, and to solve this problem, it is desired to reduce the friction on the rubber surface. .

The above-mentioned properties of rubber materials are also carried over into rubber tubular products such as rubber hoses and rubber couplings as a drawback of rubber tubular products.

In other words, traditional rubber hoses have been used not only for general household use, but also for automobile fuel hoses, air conditioner hoses, refrigerator hoses, propane gas hoses, hydraulic hoses, etc.

They have a very wide range of uses, and the media that can be passed through these hoses are diverse, including water, oil, organic solvents, and gas. Rubber hoses have good resistance to these media, are highly flexible, have excellent low-temperature properties, have excellent matching performance with the mouthpiece, and are desirable for being inexpensive. However, conventional rubber hoses do not necessarily fully satisfy the above requirements.

As a result of intensive research to meet the above-mentioned needs, the inventors of the present invention have developed adhesives mainly composed of resorcinol/formaldehyde resin and rubber latex, or adhesives containing resorcinol/formaldehyde generators and vinylpyridine/butadiene/styrene copolymer rubber. The method is to laminate a polyamide resin or polyester resin ζ1 resin film which has a softening point in the vulcanization temperature range and which has been treated with an adhesive rubber mainly composed of (1) Significantly improve the solvent resistance of oil-resistant rubber, (2) Add solvent resistance to non-oil-resistant rubber, (3) Improve the gas permeation resistance of rubber, (4) Improve the ability of rubber compounding chemicals to be removed from the rubber. Effect of preventing leakage to (5
) Reduces the friction coefficient of the rubber surface, (6) Does not substantially impair the flexibility of the rubber product, (7) Improves the ITIF toughness and deterioration resistance of rubber, and is a laminated plastic film with excellent characteristics. We have succeeded in producing plastic film laminated rubber tubular products such as rubber hoses and rubber couplings.

Therefore, for the above-mentioned purpose, the present invention provides an adhesive containing resorcinol-formaldehyde resin and rubber latex, or an adhesive rubber containing resorcinol, a formaldehyde generator, and vinylpyridine-butadiene-styrene copolymer rubber as main components. A rubber tubular product is provided by laminating a polyamide resin or polyester resin film having a softening point in the treated vulcanization temperature range on a completely unvulcanized rubber tubular product and vulcanizing and bonding the film.

The shape of the rubber hose, rubber coupling, etc. according to the present invention is that the inner peripheral surface of the rubber hose, rubber coupling, etc. is laminated with a silicone film on the front, and the outer peripheral surface of the rubber hose, rubber coupling, etc. is laminated with a glasstic film. This includes rubber hoses with a layered structure, rubber couplings, etc. in which the outer peripheral surface of the inner tube rubber is laminated with a plastic film, and the top is covered with outer rubber, and composite shapes of these three types. According to the present invention, the adhesiveness of the plastic laminate layer to the rubber tube is extremely good, and a plastic laminated rubber tubular product having excellent properties as described above can be obtained. That is, polyamide-based or polyester-based resins have excellent resistance to various solvents, especially organic solvents and alkaline aqueous solutions, and by following the method of the present invention, they have excellent resistance to various solvents, regardless of oil-resistant rubber or non-oil-resistant rubber. It can have a solvent-resistant function. Furthermore, these plastic layers have a denser 4Q structure than rubber, and the amount of gas permeation is small. Therefore, by forming the plastic laminate layer according to the present invention, the gas permeation resistance of the rubber surface can be significantly improved. can. Furthermore, these plastics have excellent chemical resistance, and by laminating these plastics on the rubber surface according to the present invention, it is possible to prevent rubber compound chemicals from leaking out of the rubber, and to prevent the solution surrounding this rubber from flowing out. and gas contamination can be prevented. Furthermore, since the plastic has a smaller coefficient of friction than rubber,
The friction coefficient of the rubber surface can be lowered. and,
Rubber tubular products having excellent functions as described above are made of adhesives whose main components are resorcinol/formaldehyde resin and rubber latex, or whose main components are resorcinol, a formaldehyde generator, and vinylpyridine/butadiene/styrene copolymer rubber. It was obtained for the first time by laminating a polyamide resin or polyester resin film treated with an adhesive comb and having a softening point in the vulcanization temperature range onto an unvulcanized rubber tube, and vulcanizing and adhering it. It has been discovered that the function of the plastic film layer is thereby maximized.

The present invention will be explained in more detail below.

The feature of the present invention is to prepare a film of polyamide resin or polyester resin that exhibits excellent permeation resistance against organic solvents and gases and has the ability to soften in the vulcanization temperature range of 120°C to 200°C. A wet adhesive treatment method in which adhesives (hereinafter referred to as RFL) whose main components are resorcinol/formaldehyde resin and rubber latex are dipped and then dried, or vinylpyridine, butanoene,
The treatment is carried out by a dry adhesive treatment method in which an adhesive rubber mainly composed of styrene copolymer rubber, resorcinol, and a formaldehyde generator (for example, hexamethylenetetramine) is laminated onto the plastic film. This is laminated onto the upper body of an unvulcanized rubber tubular article and vulcanized and bonded, thereby obtaining a laminated rubber tubular article with good adhesion between the sill plastic film and the comb. The rubber tubing thus formed can be used with organic solvents (e.g. gasoline, engine oil, machine oil, thinner) or gases (propane,
This material has dramatically improved permeation resistance against substances such as Freon gas).

In the rubber tubular article laminated with the plastic film of the present invention, the plastic film and the rubber are sufficiently bonded, and if the two are not sufficiently bonded, the plastic film may peel off during use. The rubber tubular material of the present invention does not suffer from such problems, although the rubber tubular material of the present invention may be damaged when inserting the cap, making it impossible to demonstrate its performance.

Below, we will explain the adhesive, adhesive rubber, and bonding method used in the method of the present invention. First, regarding the wet bonding method, it is possible to use an adhesive liquid called RFL as an adhesive for organic fiber cords. Are known. R
FL is a mixture of an aqueous solution of the initial feed of resorcinol/formaldehyde and rubber latex.As the rubber latex, styrene-butadiene copolymer rubber latex, vinylpyridine-styrene-butadiene copolymer rubber latex, etc. are used. It is often done.

In addition, basic substances such as hydroxide, ammonium hydroxide, and the like are preferably used as reaction catalysts. However, when bonding organic fiber cords using these RFL adhesives, the bonding will not occur unless the organic fiber cords are baked at a high temperature (200° C. to 260° C.) after being coated with the RFL adhesive.

The adhesive liquid used in the present invention may be the same as the RFL adhesive liquid described above, but at a vulcanization temperature (120°C to 200°C).
By combining the above-mentioned RFL adhesive with a polyamide resin or polyester resin that has a softening point in the vicinity, it is possible to vulcanize under normal vulcanization conditions (temperature of around 150°C) by simply drying at room temperature after applying the adhesive. It becomes possible to bond.

The initial condensate of resorcin and formaldehyde, which constitutes the main component of the adhesive used in the present invention, can be obtained by reacting 71 moles of resorcin with 08 to 7.5 moles of formaldehyde, and if a basic catalyst is used, it can be obtained at room temperature. Natural rubber latex and synthetic rubber latex, such as styrene/butadiene copolymer rubber latex, vinylpyridine Q butadiene/styrene copolymer rubber latex, etc., can be used as the comb latex.

In this case, if the rubber to be bonded is a general-purpose rubber such as natural rubber, styrene-butadiene copolymer rubber, polybuta, tsene rubber, polyisoprene rubber, etc., one or more of the above rubber latexes may be used. Rubber latex can be used. Generally, the type of rubber latex is determined depending on the type of rubber to be bonded.

For example, when acrylonitrile/butanoene copolymer rubber is targeted, acrylonitrile/butadiene copolymer rubber latex can be used.

Next, to explain the adhesive comb used in the dry adhesive method, natural rubber or synthetic rubber styrene is used for vulcanization adhesion of organic fiber cords, plus-plated or galvanized steel cords, and combs. - A method has been used in which resorcinol and a formaldehyde generator, as well as silica powder, are blended into a general-purpose coat such as butanoene copolymer coat, polybutadiene rubber, or polyisoprene rubber, and then vulcanized and bonded. However, these methods are insufficient for vulcanization adhesion between plastic films and rubber.

The adhesive rubber used in the present invention is a slightly modified version of the above-mentioned compounded composition, and it has been found that the rubber can be used to successfully vulcanize and bond plastic films and rubber bands. That is, the adhesive rubber used in the present invention may be vinylpyridine-butadiene-styrene copolymer rubber alone as a pace rubber, or may be a combination of this and other general-purpose rubbers, such as natural rubber or polybutanoene rubber. , polyimprene rubber, styrene-butadiene copolymer rubber, acrylonide υ
- Butagie copolymerization can be used by mixing 27% or more, and resorcin, a formaldehyde generator, and silica powder are added to this pace rubber, and if necessary, carbon black as a reinforcing material and inorganic filler are added. By adding and kneading softeners, anti-aging agents, vulcanizing agents, vulcanization accelerators, and commonly used rubber compounding chemicals, under vulcanization conditions at around 150°C, Good vulcanization adhesion between compounded rubber and plastic film can be achieved.

Next, regarding the quantitative relationship of the components of the adhesive liquid and adhesive rubber, it is preferable that the RFL adhesive contains 5 to 40% of the total weight of resorcinol/formaldehyde resin. In particular, it is suitable to use 10 to 20% by weight. It is preferable to use 60 to 95% of the total weight of these materials as a comb latex, and more preferably 80 to 95% by weight of the total weight.
It can be used in an amount of 0 to 90% by weight. Further, as a catalyst, it is preferable to add an appropriate amount of basic compounds such as IJ or ammonium hydroxide, which enables vulcanization preparation.

In addition, as adhesive rubber, the rubber component is 50 to 9% of the total.
It is preferable to use 0% by weight, of which 50% by weight or more is preferably vinylpyridine/butadiene/styrene copolymer rubber.

Furthermore, it is preferable to mix 3 to 12 parts by weight of lucin/rusin and 1 to 6 parts by weight of formaldehyde generator, as well as reinforcing agents, fillers, and softeners as in the case of ordinary rubber compounding. agents, anti-aging agents, accelerators, vulcanizing agents,
By blending an appropriate amount of a vulcanization accelerator and the like, it can be suitably used as an adhesive rubber.

We have described adhesives and adhesive rubbers above, but it is important for plastic films processed using these to have a low elastic modulus and the property of softening near the vulcanization temperature, and a high elastic modulus. Plastic films that are large and have a high softening point, such as polyamide resins, 6-nylon or 6-6 nylon, or polyester resins, but polyethylenetetramine resins are not preferred.

The plastic film used in the present invention includes copolymerized nylon of polyamide resin, modified nylon,
Suitable materials include 1-nylon and 12-nylon.

On the other hand, as the polyester resin, copolymerized S9 lyester resin (usually referred to as +91J ester elastomer) is suitable, and all of these are materials having the characteristics of a low temperature softening point and a low elastic modulus.

In addition, the thickness of the glass film used in the present invention is preferably 10 to 500μ, particularly 50 to 100μ; if it is less than 10μ, the transmittance characteristics will deteriorate;
Rubber used in the present invention, whether unvulcanized or not, is selected depending on the intended use and type of the product to be manufactured. The rubber component is natural rubber (N
A blend of one or more of R) and synthetic rubber is used. The synthetic rubbers include polyisoprene rubber (IR), which is a homopolymer of conjugated diene compounds such as isoprene, butadiene, and chloroprene, polybutadiene (BR), and polyisoprene rubber; Styrene-butadiene copolymer rubber (SBR) is a copolymer with vinyl compounds such as , acrylic acid, methacrylic acid, alkyl acrylates, and alkyl methacrylates.
), vinylpyrinone tanoene styrene copolymer rubber,
Acrylonitrile butadiene copolymer rubber, acrylic acid butadiene copolymer rubber, methacrylic acid butadiene copolymer rubber, methyl acrylate butadiene copolymer rubber, methyl methacrylate butadiene copolymer rubber, etc., diene compounds and olefins such as ethylene, propylene, imbutylene, etc. such as inbutylene isoprene copolymer rubber (IIR), which is a copolymer with olefins, ethylene, propylene, and cyclopentadiene terpolymer (EPDM), which is a copolymer of non-conjugated diene compounds and olefins, and ethylene. Zoropylene-5-ethylidene-2-norbornene terpolymer, ethylene propylene-1,4-hexadiene terpolymer, etc., polyalkenamers obtained by ring-opening polymerization of cycloolefins such as 2lipentenamer, etc., and oxirane. These include sulfur-curable polyepichlorohydrin rubber, which is a polymer obtained by ring-opening polymerization, and polypropylene oxide rubber. In addition, halides of the various rubbers mentioned above, such as chlorinated inbutylene isoprene copolymer rubber (CI, -IIR), brominated isobutylene inprene copolymer rubber (Br -IIR), etc., are also included.
Furthermore, ring-opened polymers of norbornene may also be used. Furthermore, the blended rubber may be a blend of the above-mentioned rubber with a saturated elastomer such as epichlorohydrin rubber, polypropylene oxide rubber, or chlorosulfonated polyethylene.

The unvulcanized comb of the present invention may include fillers such as carbon black, silica, calcium carbonate, calcium sulfate, clay, diatomaceous earth, mica, mineral oil, vegetable oil, synthetic plasticizer, etc., if necessary in addition to the above-mentioned comb. A softener, a vulcanization accelerator such as stearic acid, an anti-aging agent, a crosslinking agent, an accelerator, etc. are thoroughly kneaded using a kneading machine, or this mixture is vulcanized under appropriate vulcanization conditions. can be used.

When laminating an adhesive-treated plastic film on the inner surface of a rubber tubular object such as a rubber hose, the plastic film is wrapped and wrapped around a mantle used in the manufacture of general rubber hoses, and an extruder is then used. The organic fiber cord is braided or spirally formed, and a skin rubber is extruded and coated onto the cord, followed by vulcanization. Furthermore, when a plastic film is laminated as an intermediate layer by the method described above, the plastic film is wrapped on the inner tube rubber.

Furthermore, when laminating a plastic film on the outer surface,
By wrapping on top of the outer rubber, it is possible to manufacture combs and plastic laminated cloth according to the respective uses.

In addition to the above-mentioned method of wrapping a tape-like material, the method of laminating the plastic film layers includes a method of laminating with a heat-shrinkable tube (sealing tube),
For attaching a crosshead die to the tip of the extruder, direct lamination, blow molding, and if the resin used is soluble in a solvent, coating may be used.

In addition to sulfur vulcanization, vulcanization methods include vulcanization with organic sulfur compounds such as dithiomorpholine, thiuram vulcanization,
Peroxide vulcanization, quinoid vulcanization, resin vulcanization, metal salt vulcanization,
It includes all those obtained by metal oxide vulcanization, polyamine vulcanization, radiation vulcanization, hexamethylenetetramine vulcanization, etc.

Hereinafter, the present invention will be specifically explained with reference to Reference Examples, Examples, and Comparative Examples. However, the present invention is not limited to the following Examples.

[Reference Example 1] First, a synthesis method and a blending example of the components of the RFL adhesive liquid used in the following examples will be shown.

As a resorcinol/formaldehyde initial condensate, 9.3 g (0,085 mot) of resorcinol in 2641 water
, 11.7 g of 35% formaldehyde (0,137
A condensate (solid content concentration 5.5%) obtained by adding 9.8 g of ammonium 29 thihydroxide (moA) and reacting at a temperature of 25° C. for 48 hours was used.

As a rubber latex, 2-vinylpyridine-
Styrene-butadiene copolymer rubber latex (JSR0
650, manufactured by Japan Gosho Rubber Co., Ltd., solid content concentration 41φ)
was used.

Next, each of the above raw materials is blended in the predetermined ratio shown in Table 1,
An aqueous adhesive solution with a solid content concentration of 20 was prepared.

Table 1 Adhesive Liquid Composition On the other hand, for the plastic film to be adhered, a film with a thickness of 0.1 vrm obtained using a T-die of an extrusion device was used. In this case, polyamide 9 resin and polyester resin were used as the plastics, and three types of resins having different melting points were selected. That is, as a polyamide resin, copolymer Ny 07, CM-4000 (
(manufactured by Toshisha), 12-1-ion Diacit L-18
01 (manufactured by Daicel), 6-nylon CM-104
1 (manufactured by Toshisha), and the polyester elastomer Hytril-4056 was used as the Matabori ester resin.
, 4075+' 4766 (all manufactured by Dapon) were used.

Each of the adhesives described above was applied to both sides of the above plastic film, and dried at room temperature.

Next, the thickness 2 'r' + H according to the formulation shown in Table-2
A plastic treated with an adhesive was sandwiched between the unvulcanized comb sheets, and vulcanized and bonded using a vulcanizing press at temperatures of 1'40°C and 180°C, respectively. This has a width of 25πm1
A strip having a length of 100 mm was punched out, and a T-peel test was conducted using a tensile tester at a tensile speed of 50 iVmin to evaluate the adhesive strength. The results are shown in Table-3.

As a comparative example, a case where adhesive was applied and laminated in a flexible manner was applied.

Table 2: Unvulcanized Rubber Compounding Prescription [Reference Example 2] As an adhesion method different from Reference Example 1, an adhesive compounding rubber method was adopted.

2-vinylpyridine-styrene as rubber latex
Butanoene copolymer latex (JSR0650,
(manufactured by Japan Synthetic Rubber Co., Ltd., solid content concentration: 41) was added to a large amount of methanol with stirring, and reprecipitated. Then, after thoroughly washing with water, it was dried to obtain ■P-com. In a small Banbury mixer, resorcinol, hexamethylenetetramine (HCHO generator), silica powder and Psil VN-3) were blended into VP rubber at the predetermined ratios shown in Table 4, and other ingredients were added. was added and kneaded. Thereafter, the rubber sheet was sheeted to a thickness of 0.5 am using an open roll.

After washing each with acetone, they were sandwiched between plastics and vulcanized and bonded using presses at temperatures of 140°C and 180°C, respectively. Next, an adhesion test similar to that in Example 1 was conducted to determine the adhesion stability value.

The results are shown in Table-5.

[Example 1] A rubber hose laminated with a plastic film was obtained using the wet adhesive treatment method shown in Reference Example 1.

As a manufacturing method, copolymerized nylon (CM4000
, manufactured by Toshisha Co., Ltd.) with a thickness of 0.1 m/rr was coated on only one side using the adhesive shown in Reference Example 10A2, and dried at room temperature. Thereafter, it was cut into a tape having a width of 20 mm. Next, the above-mentioned tape was wrapped around a rubber mantle having a diameter of 10 mm treated with a silicone mold release agent so that the upper side was the adhesive-treated surface. Thereafter, a comb hose whose inner side was laminated with a plastic film was obtained by covering it with the compounded rubber shown in Table 2 using an extruder to a diameter of 20 mm.

In addition, as a method for manufacturing a rubber hose in which rubber is laminated with a plastic film as an intermediate layer, A2 adhesive is applied to both sides of a copolymerized nylon film (0.1 mu).
After drying, it was cut into tapes with a width of 20 mm. on the other hand,
A rubber mantle having a diameter of 10 mm was coated with the compounded rubber shown in Table 2 using an extruder so that the rubber mantle had a diameter of 15 mm. after that,
The above tape was wrapped while wrapping. Further, the same rubber was coated thereon with an extruder so as to have a diameter of 20 mm, and a rubber hose was obtained in which a plastic film layer was laminated as an intermediate layer.

Next, the rubber hose molded using the method described above was
Vulcanized rubber hose was obtained by vulcanization and adhesion using a steam vulcanization can under a temperature of ℃.

This vulcanized rubber hose was cut into 50 mm lengths, and caps that could be sealed were attached to both ends. As a comparative example, a rubber hose without a plastic film laminated thereon was obtained in a similar manner. Then add 3011 for toluene and 609 for freon-11 into each hose.
The solvent permeability from a vulcanized comb hose that was sealed and left at room temperature was determined based on the change in Mfjk. Table 6 shows the results.
Shown below.

[Example 2] A rubber hose with a plastic film laminated thereon was obtained using the dry adhesive treatment method shown in Reference Example 2.

First, A6 adhesive compound rubber was sheeted to a thickness Q of 5 mm to obtain a sheet. On the other hand, as a plastic film to be laminated, a 0.1 mm sheet of copolymerized nylon CM4000 (manufactured by Toshisha Co., Ltd.) was made into a tape shape with a width of 20 mm.

The method for manufacturing a rubber hose is to wrap a plastic film tape around a rubber mantle with a diameter of 10 mm treated with a silicone mold release agent, and then
The wrapping was covered while simultaneously wrapping the above adhesive compounded rubber sheet.

In addition, as a method for producing a rubber hose in which a plastic film was laminated to the rubber intermediate layer, a rubber mantle having a diameter of 10 mm was coated with the comb shown in Table 2 in a diameter of 151 ml/l. On top of that, the adhesive comb sheet from House 6 above was wrapped and wrapped, and then the silastic film was wrapped and wrapped in the same manner. Thereafter, the rubber hose was coated with Table 2 rubber to a diameter of 20 m/m using an extruder, and a plastic film was laminated as an intermediate layer to obtain a rubber hose.

Next, the rubber hose molded by the above method was
A vulcanized comb hose was obtained by vulcanization and welding in a steam vulcanizer at a temperature of .degree.

Each of the vulcanized rubber hoses was cut to a length of 50 m, and caps that could be sealed were attached to both ends. After that, add 30g of toluene to each hose.
In the case of Freon-11, 60 g was sealed and allowed to stand at room temperature, and the solvent permeability from the comb hose was determined from the weight change.・
The results are shown in Table-7.

Procedural Amendment (Import) March 15, 1980 Director-General of the Patent Office Kazuo Wakasugi ゛嵜゛,τ”1゜1
, Indication of the case 1982 Patent Application No. 220096 2 Name of the invention Rubber tubular product 3 Person making the amendment Relationship to the case Patent applicant representative Kunio Hattori 4 Agent 〒104 5. Specification subject to amendment 1. Detailed description of the invention" column.

6. Contents of amendment (1) The entire table 3 on page 23 of the specification is corrected as follows.

(2) Correct the phrase ``Table-5 180°C Beer Test'' in the first line of Section 27 to read ``Table-5 T-shaped Beer Test.''

(3) Insert legal text before ``Applicant Brideston Tire Co., Ltd.'' on page 34.

[[Example 3] Reducing the rubber wall thickness of a nylon laminated rubber hose (lighter chain)
It was investigated.

The adhesives No. and 2 of Example 1 were applied to only one side of a 100μ thick nylon film (0M4000 manufactured by Toshi Co., Ltd.), the dried film was wrapped on a mantle, and then the compounded rubber shown in Table 2 was applied to a hose. The wall thickness of 4.0, 3.0, 2.
It was extruded using an extruder and coated so as to have a depth of 0.1.5 (depression).

Next, vulcanization bonding was performed using a steam vulcanizer at 145°C.
A nylon laminated rubber hose was obtained.

Each rubber hose was cut to a length of 50CT+, and 602 cm of Freon-11 solvent was sealed in each, and the hoses were left at room temperature for one week, and the solvent permeability was determined based on the change in usage. The results are shown in Table-8.

Table 8 From the above results, it was found that there was no problem in solvent permeability even if the rubber wall thickness was set to 1.5 +++ Tll, and it was possible to make the rubber hose lighter. "that's all

Claims (1)

[Scope of Claims] 1. Treated with an adhesive containing resorcinol and formaldehyde resin Tocom Latex as main components or an adhesive rubber containing resorcinol, a formaldehyde generator, and vinylpyridine-butadiene-styrene copolymer comb as main components. 1. A rubber tubular article, characterized in that a polyamide resin or polyester resin film having a softening point in the above vulcanization temperature range is laminated onto an unvulcanized rubber tubular article and vulcanized and bonded. 2. The rubber tubular article according to claim 1, wherein a polyamide resin or polyester side fat film layer is formed on the inner circumferential surface or outer circumferential surface of the rubber tubular article or on the intermediate layer.