JP2000094583A - Rubber product and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve weather resistance, chemical resistance, oil resistance or the like of a rubber product obtained by molding a material containing general purpose rubber as a main component. SOLUTION: A desired part surface of a rubber product base 11a before vulcanization is coated with a synthetic polymer material having thermoplasticity and elasticity. The coated material is applied to a vulcanizing step, and a polymer material is fusion bonded to the surface of the base by utilizing a pressure and a heat of the step. Thus, a coating layer 11b of the polymer material is formed on the desired part surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber product mainly composed of a general-purpose rubber having a double bond in a molecular main chain such as natural rubber or styrene-butadiene rubber. And related technologies.

[0002]

2. Description of the Related Art Natural rubber, styrene butadiene rubber, polybutadiene rubber, and the like as general-purpose rubbers are inexpensive and have good workability, and are used in various industrial fields such as tires, conveyor belts, fenders, hoses, and the like. Is used in large quantities. However, this kind of rubber has ozone, ozone,
It is easily deteriorated under the influence of ultraviolet rays, oxygen and the like. In addition, there is a defect inferior in durability to acids, alkalis, oils, and organic solvents.

In order to increase the durability (hereinafter referred to as weather resistance) against ozone, ultraviolet rays, sunlight, oxygen, and the like, conventionally, when kneading the raw rubber, the kneaded product contains an antiozonant, an ultraviolet absorber, and the like. , Adding chemicals such as antioxidants, applying an ozone antioxidant to the surface of the molded article after vulcanization molding, paints having excellent weather resistance (for example, urethane paint, or acrylic modified paint containing vinyl chloride component and Chlorosulfonated polyethylene). Or, when kneading the raw rubber, in the kneaded material,
A general-purpose rubber has been modified by blending a rubber having excellent weather resistance, for example, ethylene / propylene terpolymer or chlorosulfonated polyethylene or isoprene / isobutylene rubber in an amount according to the required degree.

[0004] Further, as a method completely different from the above two methods, there has been a method of using a rubber having higher weather resistance, chemical resistance, and oil resistance than a general-purpose rubber without using a general-purpose rubber.

[0005]

However, the method of adding an antiozonant, an ultraviolet absorber, an antioxidant, etc., causes discoloration of the rubber itself and is contaminating, so that the method of using rubber products is not suitable. Some cannot.

[0006] In the method of post-coating the surface of a molded article with an antioxidant, the sustainability of the effect greatly varies depending on the use environment of the molded article. In particular, in the case of rubber products used outdoors, the durability of the above effects is low, and it is necessary to apply the antioxidant many times, which is troublesome.

Further, a method of post-coating a coating having excellent weather resistance on the surface of a molded article is particularly effective when a rubber product is used after being compressed and stretched. This method was not a practically preferable method because it was not possible to follow the continuous extension and peeling was likely to occur.

In addition, in the case of a method of blending a rubber having good weather resistance, the compounding unit price is generally increased by 20 to 30% as compared with the case of using a general-purpose rubber alone. Further, when the blending state of the rubber to be blended and the general-purpose rubber is not good, not only the blending effect is hardly obtained, but also the ozone resistance may be deteriorated.

Also, instead of using general-purpose rubber, as rubber,
In the case of using a rubber having excellent weather resistance, chemical resistance, oil resistance, and the like, the cost of the rubber product is increased. In many cases, the original mechanical characteristics cannot be satisfied. That is, when a substitute rubber is used, the performance obtained with the general-purpose rubber is sacrificed, and in some cases, the cost is increased. For example, even if the cost is compared, assuming that natural rubber is 100, that of alternative rubbers such as styrene butadiene rubber and polybutadiene rubber is about 20%.
0, and about 400 to 50 for ethylene propylene terpolymer and chlorosulfonated polyethylene.
0, and about 40 even with acrylic nitrile butadiene rubber.
A simple substitution, such as about 0, would increase the cost of the rubber product.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is therefore an object of the present invention to provide a rubber product in which general-purpose rubber is easily improved in weather resistance, chemical resistance, oil resistance, and the like. And a method of easily manufacturing the same.

[0011]

According to the invention of a rubber product of the present application, there is provided a product matrix mainly composed of one or more rubbers selected from a group of rubbers having a double bond in a molecular main chain, And a coating layer mainly composed of a thermoplastic and elastic synthetic polymer material, which coats a desired partial surface of the product base.

One embodiment of the invention of the rubber product of the present application is a rubber product having a double bond in the molecular main chain.
A product base manufactured by subjecting a desired base surface of a product base before vulcanization containing at least one kind of rubber as a main component to a synthetic polymer material having thermoplasticity and elasticity, and then putting the coated into a vulcanization process. And a rubber product provided with a coating layer.

In each of the inventions of the present application (including the invention of a later production method, the same applies hereinafter), the product base is typically selected from the group consisting of natural rubber, styrene butadiene rubber and polybutadiene rubber. It is preferable to use one or more types of rubber as a main component. These rubbers are used in various fields as called general-purpose rubbers, and have such features as being inexpensive and easy to process.
Therefore, if the resistance of the product base made of such rubber can be easily improved, industrial advantages are great.

Furthermore, the product base is typically a non-sheet-shaped three-dimensional molded product. This is because if the durability of such a three-dimensional molded product can be easily improved, industrial advantages are great.

Specifically, the product base (rubber product itself)
, Crash cushioning materials (including cushioning rubber used in bumpers and parking lots and fenders for ships), rubber hoses, belts for belt conveyors, surface coating materials for belt vehicles for belt conveyors,
It is preferable to use one selected from a packing for stopping water and a road surface material for measures against sidewalk freezing. These are often used in environments where weather resistance and the like are required, and are also required to be inexpensive. This is because if these resistances can be easily improved, industrial advantages are great. In particular, buffer rubber or rubber hose used in parking lots and the like has a large industrial use, and therefore has a great industrial advantage. In addition, road surface materials for sidewalk freezing measures are important in terms of personal safety measures in winter in cold regions, and if their resistance can be improved at low cost, there are great advantages in terms of safety industry and industry.

[0016] The desired portion of the product matrix is a portion where the resistance of the product matrix is desired to be increased. This desired part is
It may be any part of the surface of the product matrix or the whole area. Further, the desired portion may be any of the inner surface only, the outer surface only, or both the inner surface and the outer surface when the product has an outer surface and an inner surface such as a rubber hose.

The term "synthetic polymer material" as used in each invention of the present application refers to a material which is superior to the product base in terms of the resistance of the product base to be improved. In other words, if you want to increase the weather resistance of the product matrix, use a synthetic polymer material with higher weather resistance than the product matrix, and if you want to increase the chemical resistance of the product matrix, the chemical resistance must be higher than the product matrix. When it is desired to use a synthetic polymer material having a relatively higher level and increase the oil resistance of the product base, use a synthetic polymer material having a higher oil resistance than the product base. Of course, when it is desired to increase the resistance in a composite manner, a synthetic polymer material having these resistances superior to the product base is used.

The preferred synthetic polymer material is one kind of material selected from ethylene vinyl acetate copolymer, thermoplastic and elastic polyolefin resin, thermoplastic and elastic polyolefin copolymer alloy and thermoplastic polyurethane elastomer. Materials obtained by mixing a plurality of types can be given.

Ethylene vinyl acetate copolymer (so-called E
VA) is preferred as the coating layer of the present invention because it contains ethylene and has better weather resistance, chemical resistance, oil resistance, and the like than general-purpose rubber. In addition, various types of EVA having different vinyl acetate contents are provided on the market. Those having a high content of vinyl acetate are close to rubber and have an increased heat sealability to rubber. Therefore, it is preferably used as a coating layer for rubber which is generally difficult to adhere to, for example, EPDM (ethylene propylene trimer).

The thermoplastic and elastic polyolefin-based resin and the thermoplastic and elastic polyolefin-based copolymer alloy each have good compatibility with many general-purpose rubbers, have high versatility, and are affordable (4).
(100-700 yen / Kg), which is excellent in weather resistance, chemical resistance, oil resistance, etc., and is easy to handle.

Further, the thermoplastic polyurethane elastomer has the highest physical strength among the coating layer materials exemplified here. It also has oil resistance and weather resistance.
Therefore, it is preferable as a coating layer of a rubber product which is required to have high physical strength and a certain degree of oil resistance and weather resistance.

According to the invention of the rubber product of the present application, a coating layer is provided on the surface of a desired portion of the product matrix, so that the rubber product has a long-term weather resistance without impairing the original characteristics of the product matrix. , Chemical resistance, oil resistance, etc.

In the present invention, since the coating layer also has thermoplasticity, even if a part of the coating layer is broken,
There is also obtained an advantage that the damaged portion can be easily repaired by a heat sealing means such as a heat gun or a hot iron.

[0024] A rubber product of this application, which is one embodiment of the invention, is obtained by coating a desired base surface of a product base before vulcanization with a synthetic polymer material having thermoplasticity and elasticity in a vulcanization step. In a rubber product manufactured by charging, the adhesive force between the product base and the coating layer is maintained even if the product base is broken, so that the bonding effect between the two is semi-permanent. Therefore, an inexpensive and practical rubber product is realized.

The thickness of the coating layer in the present invention can be set to an arbitrary thickness according to the specifications of the rubber product. Although not limited to this, typically, several tens μm to several mm are good. Further, the thickness of the coating layer may be partially changed intentionally.

According to the invention of the method for producing a rubber product of the present application, a step of covering a desired partial surface of an unvulcanized product matrix mainly composed of rubber with a thermoplastic and elastic synthetic polymer material. And the product matrix covered with the above-mentioned synthetic polymer material is put into a vulcanization step, and the temperature and pressure in this step are used to fuse the above-mentioned synthetic polymer material to the above-mentioned desired portion surface. Forming a coating layer made of this polymer material.

Specifically, a film made of the synthetic polymer material for forming a coating layer and formed in the shape of the desired portion is temporarily fixed on a desired portion surface of the unvulcanized product matrix. The synthetic polymer is applied by applying a force pressing the two to the state body and the product base using the pressure of the vulcanization step, and applying heat for fusing the two to each other using the heat of the vulcanization step. A coating layer made of a material is formed.

In particular, when manufacturing a rubber hose,
When forming a coating layer on each of the inner surface and the outer surface of the rubber hose body, the outer diameter of a mandrel used in forming the rubber hose as a step of forming the rubber hose body and a film-like material for forming a coating layer on the inner surface of the rubber hose body. Forming a first tube made of the above-mentioned polymer material and forming a coating layer on the outer surface of the rubber hose body, and having a substantially same inner diameter as the outer diameter of the rubber hose body. Forming a second tube made of the polymer material, covering the mandrel with the first tube, further covering the mandrel with the rubber hose body, and further covering the rubber hose body with the second tube. And a step of charging the rubber hose body and the mandrel covered with the second tube and the like into a vulcanization step. In extent, it is good for producing a rubber hose.

According to the invention of this method for producing a rubber product,
The product matrix and the synthetic polymer material previously formed on the surface of the desired portion can be fused by utilizing the heat and pressure of the vulcanization step. That is, since the product matrix and the synthetic polymer material previously formed on the desired portion surface can be fused without providing a special step, a rubber product having a coating layer can be easily manufactured. . Of course,
According to this production method, it is possible to easily produce a strong rubber product in which the adhesive force between the product base and the coating layer is maintained even if the product base is broken.

[0030]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a rubber product according to an embodiment of the present invention.
However, the drawings used in the description are only schematically shown to the extent that these inventions can be understood. Also,
In each of the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

1. First Embodiment An example in which the present invention is applied to a rubber product (hereinafter referred to as "relaxation rubber") which is used by being mounted on a wall surface or a gate of a parking lot, a truck terminal or the like and has a buffering effect at the time of a vehicle collision will be described. FIG. 1A is a plan view of the cushion rubber 11. FIG.
FIG. 1B is a cross-sectional view of the cushion rubber 11 taken along the line II in FIG.

This cushion rubber 11 is made of a product base 11a,
And a coating layer 11b.

The product base 11a is a long body 11aa having a D-shaped cross section mainly composed of a general-purpose rubber described later.
And a hollow portion 11ab formed in the main body portion 11aa.
And a fixing hole 11ac provided in a part of the main body 11aa for fixing to a wall or the like (not shown) of a parking lot.

The coating layer 11b is formed on a part of the surface of the product base 11a, in this example, on the entire curved surface of the main body 11aa, that is, on the surface that comes into contact with a car or the like (surface with the air or the like). Surface).

In this cushioning rubber 11, when a car or the like touches the surface on the curved side, the main body 11aa is moved to the hollow portion 1aa.
Since it is dented on the 1ab side, it shows the function as a cushioning material.

As will be described later in detail, the product base 11a is formed by molding a material mainly composed of general-purpose rubber. The coating layer 11b is made of a thermoplastic and elastic synthetic polymer material. In this embodiment, this coating layer 11b is made of Evaflex EV.460 (trade name) manufactured by Mitsui Chemicals, a kind of ethylene vinyl acetate copolymer.
And a coating layer having a thickness of 0.3 mm.

The cushioning rubber 11 can be manufactured, for example, as follows.

In order to obtain a molding base 11a, first, a rubber having the following composition mainly composed of natural rubber and recycled rubber is prepared. Natural rubber RssNo. 5 75.0 Recycled rubber (black) 75.0 Coumarone resin 4.0 Zinc oxide No. 3 4.0 Heavy calcium carbonate 30.0 Hard clay 50.0 Aromatech oil 7.0 Vulcanization accelerator MBT 0.3 Vulcanization accelerator CBS 0.7 Vulcanization accelerator DOTG 0.7 Stearic acid 2.0 Sulfur 2.2 Total 250.9 The unit of each component is part. Also, MBT stands for Me
rcaptobenzothiazole, CBS is N-cyclohexyl-
2-bennzothiazyl-sulfenamide, DOTG is Di-
o-tolylguanidine.

The unvulcanized rubber thus prepared is preformed by using an extruder. And
This is cut to a predetermined length. Thus, a product base 11a having a D-shaped cross section as described above, in this case, cut to a length of 500 mm is obtained.

Next, the above-mentioned sheet of the ethylene-vinyl acetate copolymer is applied to the surface of the product base 11a on the curved surface side by a suitable means (here, cellophane tape) as a film-like material for forming the coating layer 11b. Temporarily fix.

Next, the product base 1 on which this sheet was temporarily fixed
The core metal is inserted into the hollow portion 11ab of 1a, and thereafter, the core metal is charged into the press die body. And bleed air 4
After repeating 5 times, the sheet and the product base are integrally formed by a press at 45 ° C. for 45 minutes. That is, in the vulcanizing step of the product base 11a, the sheet and the product base are simultaneously fused using the temperature and pressure at that time. Thereby, the coating layer 11b according to the present invention is formed on the desired portion surface of the product base 11a.

Next, the cushion rubber 11 thus manufactured is evaluated as follows. Therefore, as a comparative example, a cushioning rubber, that is, a cushioning rubber having no covering layer (the cushioning rubber of the comparative example) was used in the same manner as in the first embodiment except that the treatment for forming the covering layer 11b was not performed. ) To manufacture.

Next, each of the cushion rubbers of the first embodiment and the comparative example is subjected to an air standing test as a first weather resistance test. Specifically, an atmospheric exposure test is performed by a test method based on ASTM D518 (loop type test).

For this reason, the surface layer of the cushioning rubber of each of the first embodiment and the comparative example has a thickness of 2 mm and a width of 25 m.
Slicing is performed so that a test piece having a length of 96 mm and a length of 96 mm is obtained. Here, three test pieces are prepared for each of the first embodiment and the comparative example.

Next, as shown in FIG.
Bending is performed so that the radius R becomes 5, and a portion not used for bending is sandwiched and fixed with a piece of wood 23. However, in the case of the test piece of the first embodiment, the test piece is bent such that the coating layer 11b is on the outer surface.

Each of the test pieces prepared in this way was
Leave it outdoors to conduct a so-called outdoor exposure test. The results are shown in Table 1 below. However, n _{1 to} n _{3 in} Table 1
Means the first to third test pieces prepared above.

[0047]

[Table 1]

As can be seen from Table 1, all of the first to third test pieces n _{1 to} n ₃ of the comparative example were bent at 5 days after the start of exposure (around 21 a in FIG. 2; the same applies hereinafter). ), Many cracks having a length of 1 mm or less were found at various places. Furthermore, in the 15 days after the start of exposure, length throughout the first bending portion of the test piece n ₁ is generated many cracks 3 to 5 mm, length throughout the second bending portion of the test piece n ₂ of There occurred many cracks 3～9Mm, third specimen n ₃ is bent portion was ready to say almost disconnected. Furthermore, after the lapse of 30 days from the start of exposure, both the first through third specimen n ₁ ~n ₃ of the comparative example, was cut at the bent portion.

On the other hand, in any of the first to third test pieces n _{1 to} n _{3 of} the first embodiment, no abnormality was observed at any of 5 days and 15 days after the start of exposure. Further, 30 days after the start of the exposure, a small number of cracks having a length of 1 mm or less occurred only at the inner end (around the area denoted by 21b in FIG. 2; the same applies hereinafter) of the bent portion. Furthermore, 30 days and 60 days after the start of the exposure, 1
After 20 days, the damage was such that a small number of cracks having a length of 1 mm or less were found only at the inner ends of the bent portions of the first to third test pieces.

Thus, according to the rubber product of the present invention,
It can be understood that, despite the simple structure, the resistance to atmospheric exposure is significantly improved as compared with the related art.

Next, an ozone resistance test is performed as a second weather resistance test on each of the buffer rubbers of the first embodiment and the comparative example. Here, similarly to the first weather resistance test (see FIG. 2), a plurality of test pieces are prepared for each of the first example and the comparative example. The test pieces were tested based on JIS K6259, and the test temperature was 40 ° C. and the ozone concentration was 50 pphm.
An ozone resistance test is performed under the conditions of (parts per hundredmilion). The results are shown in Table 2 below. However, n _{1 to} n ₃ in Table 2 are the same as those in Table 1 above.
Means three test pieces.

[0052]

[Table 2]

As can be seen from Table 2, the first to the first comparative examples.
Test piece n of 3₁~ N_Three4 hours after the start of exposure
And cracks with a length of 1 mm or less
Many occurred. 24 hours after the start of exposure
Then, the first to third test pieces n ₁~ N_ThreeBoth are bent
Many cracks with a length of 1 to 2 mm occur at various locations
Was. In addition, 48 hours after the start of exposure, the first
~ 3rd test piece n₁~ N_ThreeEach of the bent parts
Many cracks having a length of 2 to 3 mm were generated at places.
Further, 72 hours after the start of exposure, the first and third
Test piece n₁, N_ThreeEach has mostly bent parts
In a cut state, the second test piece n_TwoAnd fold
Many cracks with a length of 5 to 8 mm at various points in the bent part
Had occurred. Furthermore, 96 hours after the start of exposure,
First to third test pieces n₁~ N_ThreeIn any case, the bent part
Had been cut.

On the other hand, in any of the first to third test pieces n _{1 to} n _{3 of the first} example, no abnormality was found at any of 4 hours and 24 hours after the start of exposure.
Further, 48 hours after the start of the exposure, the first and second
No abnormality was observed in any of the test pieces, and only a small number of cracks having a length of 1 mm or less were generated only at the inner end of the bent portion in the third test piece. In addition, at 72 hours and 96 hours after the start of exposure,
-The damage was such that a small number of cracks having a length of 1 mm or less were found only at the inner end of the bent portion of the third test piece.

As described above, according to the rubber product of the present invention,
It can be understood that, despite the simple structure, the ozone resistance is significantly improved as compared with the related art.

2. Second Embodiment An example in which the present invention is applied to a rubber hose will be described. In particular, an example of application to a hose suitable for use in a suction (suction) hose or the like will be described. FIG. 3A is a plan view of the rubber hose 31. FIG. FIG. 3 (B) is a side view of the end of the gome hose 31 as viewed from the opening side. However, FIG.
(B) shows the portion of the coating layer 31b in an emphasized manner so that the coating layer 31b can be easily understood.

This rubber hose 31 includes a gorge hose body which is a product base 31a, and coating layers 31b provided on the inner surface and the outer surface, respectively.

In this example, the rubber hose body 31a is made of a material mainly composed of a mixture of natural rubber and partially crosslinked styrene-butadiene rubber.

In this case, the coating layer 31b is
It is composed of Cataloy KS082P (trade name) manufactured by Montell, which is a kind of polyolefin copolymer.

The rubber hose 31 can be manufactured, for example, as follows.

The film-like material for forming the coating layer on the inner surface of the rubber hose body 31a has an inner diameter substantially equal to the outer diameter of the mandrel used for molding the rubber hose, and is provided by Cataloy KS.
A first tube made of 082P and having a thickness of 1.5 mm (that is, a tube having an outer diameter substantially equal to the inner diameter of the rubber hose body 31a) is formed by an inflation method (not shown).

As a film-like material for forming a coating layer on the outer surface of the hose body 31a, a second 0.3 mm-thick Cataloy KS · 082P having the same inner diameter as the outer diameter of the rubber hose body 31a is used. The tube is formed by the inflation method (not shown).

A raw rubber mainly composed of an unvulcanized natural rubber and an unvulcanized partially crosslinked styrene-butadiene rubber is molded by an extruder to form a rubber hose body 31a.
Is molded. In this case, the rubber hose body 31a
Has an outer diameter of 120 mm and an inner diameter of 90 mm.

Next, the first tube is put on the rubber hose molding mandrel to which the release agent has been applied. Next, the mandrel on which the first tube is hung is inserted into a hole of the rubber hose main body 31a. Next, a second tube is placed on the outer surface of the rubber hose body 31a into which the mandrel has been inserted. Then, after wrapping the entire sample with a wrapping cloth, the sample was placed in a vulcanizing can, and the vapor pressure was 4.5 kgf / cm ^2.
Vulcanize for 60 minutes under the above conditions.

After the vulcanization, the wrapping cloth is peeled off, and the mandrel is pulled out. Thereby, the coating layer 3 is formed on the inner surface and the outer surface of the rubber hose body 31a.
1b can be manufactured.

As described above, the structure and the manufacturing method of the present invention can be applied to a rubber product having an inner surface and an outer surface, such as a rubber hose.

In the above, each invention of this application has been described with reference to some embodiments. However, these inventions are not limited to the above-described embodiments, and various modifications or changes can be added.

For example, the structure of the cushioning rubber 11 described above is merely an example, and any suitable shape may be used as long as it has a coating layer.

Further, the materials used, the equipment used, and the numerical conditions described in the above-described embodiments of the manufacturing method are merely examples.

In the above-described embodiment, the example in which the present invention is applied to each of the buffer rubber and the rubber hose has been described. However, the rubber products to which the present invention can be applied are not limited to these.

For example, the present invention can be applied to a ship cushion rubber (so-called fender), a belt for a belt conveyor, or a surface covering material of a belt car for a belt conveyor. As is well known, a belt wheel is a drive unit provided on a belt conveyor for feeding a belt. The surface of the belt wheel is often provided with a rubber surface covering material to increase friction with the belt and prevent slipping of the belt. If such a surface coating material itself is composed of the coating material main body and the coating layer according to the present invention, a belt wheel excellent in weather resistance, wear resistance, and the like can be realized.

The present invention may be applied to a waterproof packing. In particular, a water-stop packing that is attached to the gate of an openable water gate and used to prevent water leakage at the water gate is used outdoors, and it is preferable to apply the present invention to increase the resistance. FIG. 4 shows an example of the structure.

FIG. 4A is a plan view of the water stoppage packing 40 for a floodgate, and FIG. 4B is a sectional view taken along the line II of FIG. 4A. A member (not shown) serving as a water gate is attached to the U-shaped inner space portion of FIG.
Along (in the example shown, along the horizontal direction (the direction of the arrow))
Be moved. On the surface of a part of the product base 40a of the waterproof packing 40 which is in contact with the frame (not shown) of the water gate,
A coating layer 40b according to the present invention is provided. Note that 40
c is a hollow portion, and 40d is a hole portion for attaching the watertight packing 40 to a member (not shown) serving as a floodgate.

Further, the present invention may be applied to a road surface material for measures against sidewalk freezing. Road surface material for sidewalk freezing measures is a rubber-applied product that reduces the risk of people falling over when the sidewalk in cold regions freezes. Specifically, it is a rubber product laid on the sidewalk instead of asphalt or concrete block. Specifically, the rubber mat has a design (for example, unevenness) suitable for preventing slippage on the surface, and has a flexibility such that the surface is easily distorted by human weight. Its hardness is JIS
It is a measurement result of a hardness tester durometer A type by K6253, which is about 15 to 40. This kind of road surface material is generally formed of a general-purpose rubber such as polybutadiene rubber and a softening agent, and it is preferable to apply the present invention to this, because the resistance and the like can be improved.
Typically, as shown in FIG.
It is preferable to provide the coating layer 50b according to the present invention on the surface on which the design (unevenness) of the non-slip is provided. The material of the coating layer 50b is arbitrary as long as it is a thermoplastic and elastic synthetic polymer material suitable for the purpose as a road surface material. For example, a thermoplastic polyolefin-based resin is preferable. According to the road surface material 50 of the present invention, the coating layer 50b can improve the weather resistance, the slip reducing effect, the degree of freedom in coloring, and the like.

[0075]

As is clear from the above description, according to the invention of the rubber product of this application, the weather resistance of the rubber product can be maintained for a long period of time without impairing the original characteristics of the product base.
A rubber product having chemical resistance, oil resistance and the like can be provided. Further, even if the coating layer itself is damaged, the damaged portion can be easily repaired by the heat sealing means. Also, the load value of the product can be improved by arbitrarily coloring the coating layer itself.

Further, according to the invention of the method for producing a rubber product of this application, it is possible to easily produce a rubber product having a product base and a coating layer provided on a desired portion surface thereof. Of course, it is possible to easily manufacture a strong rubber product in which the adhesive force between the product base and the coating layer is maintained even if the product base is broken.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a first embodiment, showing an example in which the present invention is applied to a cushion rubber used by being attached to a wall surface of a parking lot or the like.

FIG. 2 is a diagram illustrating a weather resistance test of the rubber product of the present invention.

FIG. 3 is an explanatory view of a second embodiment, showing an example in which the present invention is applied to a rubber hose.

FIG. 4 is a diagram illustrating an example in which the present invention is applied to a watertight packing for a floodgate.

FIG. 5 is a diagram illustrating an example in which the present invention is applied to a road surface material for sidewalk freezing measures.

[Explanation of symbols]

 11: Buffer rubber 11a: Product base 11aa: Main body 11ab: Hollow portion 11ac: Fixing hole 11b: Coating layer 21: Test piece 23: Wood piece 31: Rubber hose 31a: Rubber hose body 31b: Coating layer 40: Waterproof packing 40a for water gate : Product base 40b: Cover layer 40c: Hollow part 50: Road surface material for sidewalk freezing prevention 50a: Product base 50b: Cover layer

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 4F100 AK01A AK03A AK28B AK51A AK68A AK73B AL01A AL05A AL09A AN01B AN02B BA02 DA11 EJ06 EJ062 EJ172 EJ422 GB90 JB01 JB16A JK07A JL09 4F203 AA03 A01 A01 A01 AA31 A01 AA31A01

Claims (8)

[Claims] 1. A product matrix containing at least one rubber selected from a rubber group having a double bond in a molecular main chain as a main component, and a thermoplastic and elastic material covering a desired partial surface of the product matrix. A rubber product comprising: a synthetic polymer material; 2. The rubber product according to claim 1, wherein the rubber group is a group consisting of natural rubber, styrene-butadiene rubber and polybutadiene rubber, and the synthetic polymer material is an ethylene-vinyl acetate copolymer,
A material formed by mixing one or more materials selected from thermoplastic and elastic polyolefin-based resins, thermoplastic and elastic polyolefin-based copolymer alloys and thermoplastic polyurethane elastomers, wherein the product matrix is a non-sheet-shaped three-dimensional molding Rubber product characterized by being a thing. 3. A synthetic polymer having thermoplastic and elastic properties on a desired partial surface of a pre-vulcanized product base material containing one or more rubbers selected from a rubber group having a double bond in a molecular main chain as a main component. A rubber product provided with a product base and a coating layer, which is manufactured by putting a material coated with a material into a vulcanization process. 4. The rubber product according to claim 3, wherein the rubber group is a group consisting of natural rubber, styrene-butadiene rubber and polybutadiene rubber, and the synthetic polymer material is an ethylene-vinyl acetate copolymer,
A material formed by mixing one or more materials selected from thermoplastic and elastic polyolefin-based resins, thermoplastic and elastic polyolefin-based copolymer alloys and thermoplastic polyurethane elastomers, wherein the product matrix is a non-sheet-shaped three-dimensional molding Rubber product characterized by being a thing. 5. The rubber product according to any one of claims 1 to 4, wherein the rubber product is a cushioning material, a rubber hose, a belt for a belt conveyor, a surface coating material for a belt conveyor belt vehicle, and water stoppage. A rubber product characterized in that the rubber product is one selected from packing for road use and road surface material for sidewalk freezing measures. 6. In producing a rubber product comprising a rubber-based product base and a coating layer covering the surface of the product base, a desired partial surface of the unvulcanized product base is obtained by: A step of covering with a synthetic polymer material having thermoplasticity and elasticity, The product base covered with the synthetic polymer material is put into a vulcanization step, and the temperature and pressure in the step are used to apply Fusing the synthetic polymer material to form a coating layer made of the material. 7. The method for producing a rubber product according to claim 6, wherein the rubber is one or a mixture of two or more kinds selected from natural rubber, styrene-butadiene rubber, and polybutadiene rubber; , Ethylene-vinyl acetate copolymer,
One or a mixture of two or more materials selected from thermoplastic and elastic polyolefin-based resins, thermoplastic and elastic polyolefin-based copolymer alloys, and thermoplastic polyurethane elastomers. A method for producing a rubber product, comprising: 8. The method for producing a rubber product according to claim 6, wherein the rubber product is a cushioning material, a rubber hose, a belt for a belt conveyor, a surface coating material for a belt car for a belt conveyor, and a packing for waterproofing. And a method for producing a rubber product, which is one selected from road surface materials for preventing sidewalk freezing.