JP4754131B2 - Method for manufacturing a jacket for bridging a belt sleeve - Google Patents

Description

【００３０】
（ベルトスリーブの作製）
金型の成形面に、ＲＦＬ液（スチレン−ブタジエン−ビニルピリジン三元共重合体１００質量部、レゾルシン１４．６質量部、ホルマリン９．２質量部、苛性ソーダ１．５質量部、水２６２．５質量部）のみで処理した綿帆布を１プライ積層し、ポリエステル繊維のロープからなる心線を巻付け、表２に示すＥＰＤＭのゴム組成物から調製し、バンバリーミキサーで混練後、カレンダーロールで厚さ１ｍｍに圧延した圧縮ゴム層用シートを３プライ、また表２に示す厚さ０．５ｍｍに圧延した接着ゴム層用シートとの積層物を巻き付けてＶリブベルト用のベルトスリーブを作製した。
【００３１】
【表２】

【００３２】
得られたベルトスリーブの外表面に離型剤（カリ石鹸、脂肪酸グリコール）を塗付した場合と離型剤を使用しない場合において、上記種々のジャケットを嵌め込んで通常の方法で架橋してジャケットの離型性と使用回数（耐久性）を評価した。その結果、ジャケットの離型性は良好であり、１００回使用した後でもさらに使用可能な状態であった。
【００３３】
比較例１
ジャケットとしては、未架橋成形体の外表面にポリ塩化ビニリデン（融点１４０℃、幅２２０ｍｍ×厚み１０μｍ）を１プライ巻き付けた以外は、実施例１と全く同じ方法で作製し、これを実施例１と同様のベルトスリーブに嵌め込んで通常の方法で架橋してジャケットの離型性と使用回数（耐久性）を評価した。その結果、ジャケットの離型性は良好であったが、使用回数は３０回であった。
【００３４】
このように、実施例１では、メチルペンテンコポリマーは融点が２３５℃と高くて架橋後もジャケットに付着しているため、外気である酸素と遮断ができ、ジャケット外層の架橋状態も良好で膨れもなかった。そして、このジャケットの使用回数は１００回で、比較例１に比べて耐久性があった。一方、比較例１では、融点が１４０℃のポリ塩化ビニリデンを使用したため、架橋後ではフィルムの形跡もなく気化していた。外層はポリ塩化ビニリデンの影響で茶色に変色し、酸素遮断は失敗し、爪で剥げるような状態で架橋不足になった。このため、ジャケットの使用回数も３０回になると外層の架橋不足部分が原因で内層部分から剥離してしまいこれ以上の使用は困難になった。
【００３５】
【発明の効果】
以上のように本願の請求項記載の発明では、有機過酸化物を配合したジャケット用ゴム組成物をモールドに巻き付け成形体を作製し、この成形体の外周面に耐熱性高分子フィルムを被覆してゴム成形体表面と外気中の酸素との接触を遮断して架橋したジャケットにあり、耐熱性高分子フィルムによってジャケットの外周面は外気が遮断されているために、外層も充分に架橋され、内層、外層に区別されず均一な層をもったジャケットに仕上げることができ、耐久性を向上させることができる効果がある。
【図面の簡単な説明】
【図１】本発明に係るジャケットの製造方法を示す概略図である。
【図２】本発明方法で得られたジャケットの断面図である。
【図３】本発明方法で得られたジャケットを金型面上に成形したベルトスリーブに被せた状態の断面図である。
【符号の説明】
１ ジャケット
２ モールド
３ 成形体
４ 耐熱性高分子フィルム[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method of a jacket for bridging a belt sleeve, and a tubular shape such as a power transmission belt such as a V-ribbed belt, a low edge belt, a low edge single cog belt, a low edge double cog belt, a toothed belt, and a conveyor belt. The present invention relates to a method for manufacturing a jacket that can be used when the belt sleeve is cross-linked and can be used more frequently.
[0002]
[Prior art]
Crosslinking of rubber composition with excellent heat resistance and gas permeability such as butyl rubber and butyl rubber blended with ethylene-propylene-diene rubber (EPDM) by direct vapor crosslinking, that is, rubber is in contact with oxygen in the air Belt sleeves for power transmission belts such as V-ribbed belts, low-edge belts, low-edge single cog belts, low-edge double cog belts, V-belts, and toothed belts have been manufactured.
[0003]
As the belt material, natural rubber, SBR, butyl rubber, chloroprene rubber, hydrogenated nitrile rubber, alkylated chlorosulfonated polyethylene and the like are used. As the crosslinking system, a crosslinking agent other than organic peroxide such as sulfur crosslinking is relatively used. Often used.
[0004]
In recent years, organic peroxides that are easy to obtain rubber with excellent heat resistance and creep resistance are used for belts due to increasing heat resistance requirements for belts due to the increase in ambient temperature around the engine room of automobiles and demands for improvement in belt creep properties. It has been increasingly used as a crosslinking agent for rubber.
[0005]
[Problems to be solved by the invention]
However, when a belt made of a rubber composition in which an organic peroxide is blended as a crosslinking agent is used for cross-linking, a conventional butyl rubber or a jacket made of a rubber composition in which EPDM is blended with butyl rubber, the butyl rubber is an organic peroxide . The degradation of the jacket is significant and the number of times it can be used is shortened compared to the case where a belt made of a sulfur-crosslinked rubber composition is cross-linked by being attacked by radicals generated by the decomposition of the resin and mainly causing a decomposition reaction. was there.
[0006]
In order to solve this problem, polymers having excellent heat resistance such as EPDM, hydrogenated nitrile rubber, silicone rubber, fluorine rubber, alkylated chlorosulfonated polyethylene, acrylic rubber, epichlorohydrin rubber, etc. are used as the rubber for the jacket, When a jacket made of a rubber composition using an organic peroxide as a cross-linking agent is cross-linked by a direct steam cross-linking method in order to extend the life, the jacket surface in direct contact with air is sufficiently obtained when the jacket is cross-linked. When this jacket was used for belt sleeve crosslinking without crosslinking, the layer that was not sufficiently crosslinked on the surface of the jacket after repeated use peeled off, resulting in a shorter life than conventional jacket rubber. Oops.
[0007]
The present invention was born from such a background, and an object of the present invention is to provide a method for manufacturing a jacket for bridging a belt sleeve that can be used more frequently.
[0008]
[Means for Solving the Problems]
That is, in the invention of claim 1 of the present application, a rubber composition for a jacket containing an organic peroxide is wound around a mold to form a molded body, and the outer peripheral surface of the molded body is covered with a heat resistant polymer film. In the manufacturing method of the jacket for cross-linking the cross-linked belt sleeve by blocking the contact between the surface of the molded body and the oxygen in the outside air, since the outer surface of the jacket is blocked by the heat-resistant polymer film In addition, the outer layer is also sufficiently crosslinked and can be finished into a jacket having a uniform layer without being distinguished from the inner layer and the outer layer, and the number of use can be increased.
[0009]
The invention according to claim 2 of the present application resides in a method for manufacturing a jacket for crosslinking a belt sleeve obtained by removing a heat resistant polymer film from a rubber molded body after crosslinking.
[0010]
The invention according to claim 3 of the present application is selected from ethylene-α-olefin elastomer, hydrogenated nitrile rubber, silicone rubber, fluororubber, alkylated chlorosulfonated polyethylene, acrylic rubber, and epichlorohydrin rubber as the rubber for the jacket. A method of manufacturing a jacket for crosslinking a belt sleeve using at least one polymer.
[0011]
Invention of Claim 4 of this application exists in the manufacturing method of the jacket for bridge | crosslinking the belt sleeve whose heat resistant polymer film is melting | fusing point 200 degreeC or more.
[0012]
The invention according to claim 5 of the present application resides in a method for manufacturing a jacket for crosslinking a belt sleeve in which the heat-resistant polymer film is a methylpentene copolymer.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic view showing a manufacturing method of a jacket according to the present invention, and FIG. 2 is a sectional view of the obtained jacket.
[0014]
As shown in FIG. 1, a sheet product obtained by rolling a rubber composition for a jacket with a calendar is wound around a cylindrical mold 2 a predetermined number of times to produce a molded body 3 having a thickness of 7 to 20 mm. Further, the heat-resistant polymer film 4 is completely covered to block outside air. Then, another cylindrical jacket is fitted on the outside of the heat resistant polymer film 4 and put into a cross-linking can for vapor cross-linking, and then the molded body is removed from the mold and finished into a jacket 1. Thereafter, the heat resistant polymer film 4 may be peeled off.
[0015]
The rubber for the jacket is at least one polymer selected from ethylene-α-olefin elastomer, hydrogenated nitrile rubber, silicone rubber, fluorine rubber, alkylated chlorosulfonated polyethylene, acrylic rubber, and epichlorohydrin rubber.
Examples of the ethylene-α-olefin elastomer include rubbers made of ethylene-propylene rubber (EPR) and ethylene-propylene-diene monomer (EPDM). Examples of diene monomers include dicyclopentadiene, methylene norbornene, ethylidene norbornene, There is 1,4-hexadiene.
[0016]
An organic peroxide, which is a peroxide , is used as a crosslinking agent for the rubber for the jacket. Further, Tlac as a co-crosslinking agent (co-agent), TAC, 1,2 -polybutadiene, metal salts of unsaturated carboxylic acids, oximes, guanidine, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, N-N' m-phenylene bismaleimide, sulfur and the like are usually used for peroxide crosslinking.
Examples of the organic peroxide include diacyl peroxide, peroxyester, diallyl peroxide, di-t-butyl peroxide, t-butylcumyl peroxide, and dicumyl peroxide that are usually used for crosslinking of rubber and resin. Oxide, 2,5-dimethyl-2,5-di (t-butylperoxy) -hexane-3,1,3-bis (t-butylperoxy-isopropyl) benzene, 1,1-di-butylperoxy -3,3,5-trimethylcyclohexane and the like, and those having a half-life of 1 minute by thermal decomposition of 150 to 250 ° C. are preferred.
[0018]
The addition amount is about 1 to 8 parts by mass, preferably 1.5 to 4 parts by mass, with respect to 100 parts by mass of the rubber for jacket.
[0019]
In addition, various agents such as reinforcing agents such as carbon black and silica, fillers such as clay and calcium carbonate, softeners, processing aids, anti-aging agents, and co-crosslinking agents such as TAIC may be added as necessary. Good.
[0020]
Usually, since the belt sleeve is often crosslinked in the range of 150 to 190 ° C, the heat-resistant polymer film 4 used is a polyamide having a melting point of 200 ° C or higher, preferably in the range of 200 to 300 ° C, It is necessary to use polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyphenylene sulfide, polyether ether ketone, methyl pentene copolymer, polyvinylidene fluoride, polytetrafluoroethylene, polycarbonate and the like. When the melting point is less than 200 ° C., the film is melted during crosslinking, and the rubber surface is in direct contact with oxygen in the crosslinking can, so that the polymer radical generated by the reaction between the organic peroxide and the polymer is bonded to oxygen. Because of this, the rubber on the jacket surface does not sufficiently crosslink the rubber on the jacket surface. Of these high melting point films, methylpentene copolymer, polyvinylidene fluoride, polytetrafluoroethylene, and nylon, which are stretchable at room temperature, are preferable because they can be easily wound so as to be in close contact with rubber.
[0021]
As shown in FIG. 3, the obtained jacket 1 is attached to a molding machine (not shown) as shown in FIG. 3 and then covered on the outer surface of the compression rubber layer 12 of the belt sleeve 11 formed on the molding surface. These are put in a crosslinking can and crosslinked under normal conditions. Flange for sealing the inside at the time of bridge | crosslinking can also be provided in the both-ends edge part of the jacket 1 used here.
[0022]
As the production of the belt sleeve 11, for example, in the case of a V-rib belt or a low-edge belt, a water-based release agent is applied on the surface of the mold 10 and dried. A sheet made of a rubber composition of the same kind as a sheet-like adhesive rubber layer made of a rubber composition using, for example, ethylene-α-olefin elastomer, hydrogenated nitrile rubber, alkylated chlorosulfonated polyethylene, chloroprene, etc. It is obtained by winding a sheet on which a compressed rubber layer 12 is laminated in advance.
[0023]
Further, the compression rubber layer 12 is mixed with short fibers made of nylon 6, nylon 66, polyester, cotton, and aramid to improve the side pressure resistance of the compression rubber layer of the transmission belt, and the compression surface that comes into contact with the pulley. The surface of the rubber layer is polished by a grinder to project the short fibers. The friction coefficient on the surface of the compressed rubber layer is lowered, and noise during belt running is reduced. Of these short fibers, aramid short fibers that are rigid, strong, and wear resistant are most effective.
[0024]
In order for the aramid short fibers to sufficiently exhibit the above-described effects, the fiber length of the aramid fibers is 1 to 20 mm, and the amount added is 1 to 30 parts by mass with respect to 100 parts by mass of rubber. This aramid fiber is an aramid having an aromatic ring in its molecular structure, for example, trade names Conex, Nonex, Kevlar, Technora, Twaron, etc.
[0025]
Further, the compressed rubber layer 12 may include reinforcing agents such as carbon black and silica, fillers such as clay and calcium carbonate, softeners, processing aids, anti-aging agents, and co-crosslinking agents such as TAIC as necessary. Various drugs may be added.
[0026]
The same rubber composition as that of the compressed rubber layer 12 is used for the adhesive rubber layer. However, in order to adhere well to the polyester fiber, the aramid fiber, the glass fiber, etc. which are the core wires 13, an ethylene-α-olefin elastomer composition by sulfur crosslinking not containing peroxide, a chlorosulfonated polyethylene composition or hydrogen A nitrile rubber composition can also be used.
[0027]
The cord 13 is made of polyethylene terephthalate fiber, polyester fiber having ethylene-2,6-naphthalate as a main constituent unit, or a rope made of polyamide fiber, and is subjected to adhesion treatment for the purpose of improving adhesion to rubber. . As such an adhesion treatment, it is common to immerse the fiber in resorcin-formalin-latex (RFL solution) and then heat-dry to form a uniform adhesion layer on the surface. However, the present invention is not limited to this, and there is also a method of performing a pretreatment with an epoxy or isocyanate compound and then treating with an RFL solution.
[0028]
【Example】
Hereinafter, the effects of the present invention will be confirmed by more specific experimental examples.
Example 1 and Comparative Example 1
(Production of jacket)
Each rubber compound shown in Table 1 was kneaded with a banbury and made into a rolled sheet having a thickness of 0.5 mm by a calender. The rolled sheet was wound 24 times around a cylindrical mold having an outer diameter of 1,280 mm to form an uncrosslinked molded body having a thickness of 12 mm, and a methylpentene copolymer (melting point: 235 ° C., width) on the outer surface of the molded body. (300 mm × 25 μm thickness) after winding 1 ply, another cylindrical jacket was inserted, this was put in a cross-linking can and cross-linked under normal conditions, and then the cross-linked molded product was extracted from the cylindrical drum and finished into a jacket .
[0029]
[Table 1]

[0030]
(Production of belt sleeve)
On the molding surface of the mold, an RFL solution (100 parts by mass of a styrene-butadiene-vinylpyridine terpolymer, 14.6 parts by mass of resorcin, 9.2 parts by mass of formalin, 1.5 parts by mass of caustic soda, 262.5 parts of water) 1 ply of cotton canvas treated only with (part by mass), wound with a cord made of polyester fiber rope, prepared from the EPDM rubber composition shown in Table 2, kneaded with a Banbury mixer, and thick with a calender roll A belt sleeve for a V-rib belt was prepared by winding 3 plies of a compressed rubber layer sheet rolled to a thickness of 1 mm and a laminate of an adhesive rubber layer sheet rolled to a thickness of 0.5 mm shown in Table 2.
[0031]
[Table 2]

[0032]
When the release agent (potassium soap, fatty acid glycol) is applied to the outer surface of the obtained belt sleeve and when the release agent is not used, the above various jackets are fitted and cross-linked by a normal method to form a jacket. The release properties and the number of times of use (durability) were evaluated. As a result, the releasability of the jacket was good, and it was in a usable state even after being used 100 times.
[0033]
Comparative Example 1
A jacket was produced in the same manner as in Example 1 except that 1 ply of polyvinylidene chloride (melting point: 140 ° C., width: 220 mm × thickness: 10 μm) was wound on the outer surface of the uncrosslinked molded body. It was fitted into the same belt sleeve as above and crosslinked by a usual method to evaluate the releasability of the jacket and the number of uses (durability). As a result, the releasability of the jacket was good, but the number of uses was 30 times.
[0034]
Thus, in Example 1, since the methylpentene copolymer has a high melting point of 235 ° C. and remains attached to the jacket even after crosslinking, it can be blocked from oxygen, which is outside air, and the crosslinked state of the jacket outer layer is good and does not swell. There wasn't. The jacket was used 100 times and was more durable than Comparative Example 1. On the other hand, in Comparative Example 1, since polyvinylidene chloride having a melting point of 140 ° C. was used, it was vaporized without any trace of the film after crosslinking. The outer layer turned brown due to the influence of polyvinylidene chloride, the oxygen barrier failed, and the cross-linkage was insufficient when it was peeled off with a nail. For this reason, when the jacket was used 30 times, it was peeled off from the inner layer portion due to the insufficient cross-linking portion of the outer layer, making it difficult to use the jacket further.
[0035]
【The invention's effect】
As described above, in the invention described in the claims of the present application, a rubber composition for a jacket containing an organic peroxide is wound around a mold to form a molded body, and the outer peripheral surface of the molded body is covered with a heat resistant polymer film. Because the outer surface of the jacket is blocked by the heat-resistant polymer film, the outer layer is also sufficiently cross-linked. The jacket can be finished with a uniform layer regardless of whether it is an inner layer or an outer layer, and the durability can be improved.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a method for manufacturing a jacket according to the present invention.
FIG. 2 is a cross-sectional view of a jacket obtained by the method of the present invention.
FIG. 3 is a cross-sectional view showing a state where a jacket obtained by the method of the present invention is put on a belt sleeve formed on a mold surface.
[Explanation of symbols]
1 Jacket 2 Mold 3 Molded body 4 Heat resistant polymer film

Claims (5)

A rubber composition for a jacket containing an organic peroxide is wound around a mold to form a molded body, and the outer peripheral surface of the molded body is covered with a heat-resistant polymer film so that the surface of the molded body is in contact with oxygen in the outside air. A method for manufacturing a jacket for crosslinking a belt sleeve, wherein the belt sleeve is crosslinked by blocking.   2. The method for producing a jacket for crosslinking a belt sleeve according to claim 1, wherein after the crosslinking, the heat-resistant polymer film is removed from the rubber molded body.   Claim using at least one polymer selected from ethylene-α-olefin elastomer, hydrogenated nitrile rubber, silicone rubber, fluorine rubber, alkylated chlorosulfonated polyethylene, acrylic rubber, epichlorohydrin rubber as the rubber for jacket Item 3. A method for producing a jacket for crosslinking a belt sleeve according to item 1 or 2. The method for producing a jacket for crosslinking a belt sleeve according to any one of claims 1 to 3 , wherein the heat-resistant polymer film has a melting point of 200 ° C or higher. Jacket manufacturing method for heat resistant polymer film to crosslink the belt sleeve according to claim 4, wherein a methylpentene copolymers.

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