JP3347095B2 - Treated fiber fabric for power transmission belt - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a treated fiber woven fabric for a power transmission belt, and more particularly to a toothed belt in which all or a part of the surface of a belt body formed of a rubber compound is covered with a fiber woven fabric.
In transmission belts such as ribbed belts, V-belts, flat belts, etc., a treated fiber weave for a transmission belt that contributes to a longer service life by reducing the frictional resistance of the fibrous fabric over a long period of time
About things .

[0002]

2. Description of the Related Art Toothed belts that simultaneously drive camshafts of automobile engines and auxiliary equipment such as injection pumps, oil pumps, water pumps, etc., are subject to the use conditions associated with high engine output and compact engine rooms. Has become more severe, and further improvement in durability has been demanded. Similarly, a toothed belt used for a general industrial machine is required to extend a belt replacement cycle.

[0003] Such failure modes of the toothed belt are roughly classified into cutting of the belt due to fatigue of the cord, and chipping due to overload and wear of the cloth. For cutting due to core fatigue,
Use of aramid core wire or small-diameter core wire of high-strength glass, use of hydrogenated nitrile rubber (H-NBR) compound with excellent heat resistance, and keep the belt tension constant during startup and running as an improvement on the engine side. It has been improved by using an auto tensioner and the like, and the occurrence of cutting failure has been reduced.

[0004] However, with respect to the occurrence of tooth chipping, although measures such as the use of tooth cloth using high-strength nylon 6-6 or aramid fiber have been taken, they are still insufficient. Therefore, in order to further improve the chipping resistance of the toothed belt coated with the tooth cloth, it is considered effective to reduce the friction coefficient of the tooth cloth surface. EP 0 662 571 B1 proposes a toothed belt in which a polymer matrix layer containing a fluorine resin is coated by spraying or coating on the outside of a woven fabric layer of a tooth cloth. This fluororesin is bound without a boundary layer in a special polymer matrix. Then, the polymer matrix is bonded to the tooth cloth. However, since the fluororesin is firmly bonded to the polymer matrix, the fluororesin remains surrounded by the matrix, and there has been a problem that the effect of reducing the friction coefficient by the fluororesin cannot be sufficiently exhibited. Also, due to material limitations of the polymer matrix,
There is a problem that the amount of the fluororesin that can be contained is small, the thickness of the polymer matrix layer is also reduced, and the improvement in tooth chipping resistance by the fluororesin is not sufficient.

In Japanese Patent Application Laid-Open No. Hei 7-151190, the surface and the inside of a tooth cloth are impregnated with a rubber mixture containing a fibrous fluororesin, and the back surface of the tooth cloth is applied to a rubber layer of a belt body via an adhesive layer. Coupling toothed belts have been proposed. The reason why the fluororesin in the rubber mixture is converted into a fiber by a kneading step or the like is to prevent the fluororesin in the rubber mixture from becoming foreign matters and reducing the strength of the rubber mixture. However, there is a problem that the fluororesin fiberized in the rubber mixture has few opportunities to be exposed on the friction surface, and the effect of reducing the friction coefficient by the fluororesin is not sufficient. Further, in order to maintain the strength without converting the fluororesin into fibers to form foreign substances, only about 1 to 30 parts by weight of the fluororesin can be contained with respect to 100 parts by weight of the rubber impregnated in the tooth cloth. There is a problem that the improvement of the tooth chipping property is not sufficient.

In V-belts and V-ribbed belts for power transmission for general industrial use and automobiles, in order to prevent abrasion between the belt back surface and the pulley and generation of abnormal noise,
It has a structure in which a woven fabric made of fiber woven fabric is attached to the back of the belt. In this case as well, it is desired to improve the abrasion resistance and reduce abnormal noise by reducing the coefficient of friction of the fiber woven fabric as in the case of the toothed belt.
No effective measures have been proposed.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and is directed to a toothed belt in which all or a part of a surface of a belt body formed of a rubber compound is covered with a fiber fabric . In a transmission belt such as a V-ribbed belt, a V-belt, and a flat belt, it is an object of the present invention to provide a treated fiber woven fabric for a transmission belt that contributes to an increase in belt life by reducing the frictional resistance of the fiber woven fabric over a long period of time.

[0008]

SUMMARY OF THE INVENTION The present invention is the fiber fabric coated on the belt body, and the powdery anti-friction material comprising at least fluorine resin powder is focused between the front and back surfaces and the fibers of the fiber fabric, woven fabric The present invention has been completed based on the finding that the fluorine resin powder containing a large amount is exposed to the friction surface more frequently, and the effect of reducing the friction coefficient can be surely exhibited.

[0009] That is, the invention of claim 1, wherein the whole or part of the surface of the transmission belt is for a transmission belt processing fiber fabric coated with fiber fabric, untreated fiber fabric a resorcinol - formaldehyde - rubber latex First dispersion in which a powdery anti-frictional material containing at least a fluororesin powder is dispersed in a treatment liquid
After impregnating with a treatment liquid and drying, the antifriction material is bundled between the front and back surfaces of the fiber fabric and between the fibers, and then impregnated with a second treatment liquid made of rubber paste, dried and unvulcanized first rubber. After depositing the layer,
In addition, use fluororesin powder or fluororesin powder
Impregnated with the 3rd treatment liquid to which the outer powdered lubricant was added, and dried
The uncured outermost rubber layer is adhered to the treated fiber woven fabric for a power transmission belt, and a large amount of fluororesin powder is resorcinated.
It can be focused on or near the surface of the fiber woven fabric through the solid content of the resin latex and rubber latex, which is the precondensate of formalin, protects the abrasion of the treated fiber woven fabric , and maintains a low coefficient of friction for a long time. Yes, and the outermost
The addition of an antifriction material to the rubber layer
Protects the abrasion of the textile fabric and maintains a low coefficient of friction for a long time
can do.

[0010] the invention of claim 2 wherein is a transmission belt for processing fiber woven fabric isocyanate compound or epoxy compound is added to the rubber cement of the second processing solution, further the adhesion between the treated fiber fabric and the belt body Can be improved.

The invention according to claim 3 of the present invention is characterized in that the fluororesin powder is used in an amount of 30 to 100 parts by weight based on 100 parts by weight of a rubber latex solid content of a resorcin-formalin-rubber latex treatment liquid.
200 parts by weight are added to the treated fiber woven fabric for a power transmission belt having a particle diameter of 100 μm or less.

The invention according to claim 4 of the present application resides in a treated fiber woven fabric for a power transmission belt, wherein the fluororesin powder is an aqueous dispersion,
Thereby, the fluororesin powder was converted into resorcinol-formalin-
It can be uniformly added to the rubber latex treatment liquid.

[0013]

The invention according to claim 5 of the present application is characterized in that the fluororesin powder is polytetrafluoroethylene, polytrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkoxyethylene copolymer, It is at least one selected from fluoroethylene-ethylene copolymers.

The invention according to claim 6 of the present invention is characterized in that the powdered lubricant other than the fluororesin powder is graphite, molybdenum disulfide, glass beads, ceramic powder, spherical phenol resin powder and aramid, polyamide, polyester, polybenzoxazole, It is at least one selected from fiber cut yarn or powder.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a treated fiber woven fabric for a power transmission belt according to the present invention. FIG. 1 is an enlarged sectional view of a treated fiber woven fabric coated on the tooth surface of the toothed belt,
FIG. 2 is a perspective view showing the structure of the toothed belt.

In FIG. 2, a toothed belt A has a plurality of teeth 3 arranged at predetermined intervals along the longitudinal direction, a back 2 continuous with the teeth 3, a core wire 1 embedded in the back 2, and Tooth part 2
And a tooth cloth 4 coated on the surface of the tooth cloth. The back 2 and the teeth 3 constitute a belt body formed of the rubber compound 9. In addition, the fiber woven fabric as the tooth cloth 4 is configured using a fiber woven fabric formed by weaving a weft 7 extending in the longitudinal direction of the belt and a warp 8 extending in the width direction of the belt.

The V-ribbed belt B shown in FIG. 3 is a cover fabric 30 as an extension portion 32 made of fiber woven fabric , a cushion rubber layer 33 in which a cord 41 made of a cord is embedded, and an elastic layer below the cushion rubber layer 33. It comprises a compression unit 36. The compression section 36 has a plurality of trapezoidal ribs 37 and a groove section 38 extending in the belt longitudinal direction and having a substantially triangular cross section.

The V-ribbed belt and the V-belt have a structure in which a fiber woven fabric is coated on the back and periphery of a belt body made of a rubber compound, and a pulley is rolled on the fiber woven fabric . As described above, the fiber fabric is coated on the transmission surface and / or the back surface of the belt, and is coated on the entire front surface and back surface or a part of the belt body.

In the present embodiment, first, the fibrous fabric constituting the tooth cloth 4 and the cover canvas 30 is first dispersed by adding at least a fluororesin powder to a resorcin-formalin-rubber latex (RFL) treatment liquid. After impregnating the processing liquid, the amount of the first processing liquid adhered is adjusted through a pair of pressure rolls. Then, it heat-drys at 150-200 degreeC for 1-3 minutes.

The treated tooth cloth 4 thus obtained is composed of a rubber component 21 and a resin-based adhesive component so that the fluororesin powder is bound between the front and back surfaces of the fiber woven fabric formed by weft 7 and warp 8 and the fibers. mixture 24 is impregnated formed consisting of 22..

The rubber component 21 is a rubber solid obtained by heating and drying a rubber latex.
Is the precondensate of resorcinol and formalin. The rubber component 21 and the resin-based adhesive component 22 are solids remaining after the RFL treatment liquid is dried and heated.

The resin adhesive component 22 adheres to the fibers of the weft 7 and the warp 8. Further, a fluororesin powder 23 is dispersed and mixed in a matrix composed of the rubber component 21 and the resin-based adhesive component 22. The fluororesin powder 23 is not bonded to the rubber component 21 and the resin-based adhesive component 22.

The RFL treatment liquid is a mixture of an initial condensate of resorcinol and formalin and a rubber latex. In this case, the molar ratio of resorcinol to formalin is 3 /
It is preferable to make it 1 to 1/3 in order to increase the adhesive strength. The initial condensate of resorcinol and formalin is mixed with rubber latex so that the resin content is 5 to 50 parts by weight with respect to 100 parts by weight of rubber of rubber latex. Solid concentration of 10
Adjust to ~ 40% concentration.

The rubber latex forming the rubber component 21 includes styrene-butadiene-vinylpyridine terpolymer (VP) and styrene-butadiene copolymer (SB
R), chloroprene (CR), acrylonitrile butadiene copolymer (NBR), hydrogenated NBR (H-NB)
One or more blends of R), chlorosulfonated polyethylene (CSM), natural rubber and the like are used.

The above-mentioned rubber component 21 and resin-based adhesive component 2
Fluororesin powder 23 that is not bonded to 2 is polytetrafluoroethylene, polytrifluoroethylene, tetrafluoroethylene-hexafluoropropylene copolymer,
At least one of a tetrafluoroethylene-perfluoroalkoxyethylene copolymer and a tetrafluoroethylene-ethylene copolymer. The greater the ratio of the number of fluorine atoms in the fluororesin powder 23, the greater the effect of reducing the coefficient of friction. Therefore, assuming the same amount of adhesion to the fiber fabric ,
Among the fluororesin powders 23, polytetrafluoroethylene is the most effective in reducing the coefficient of friction and has a long toothless life. However, other fluororesins also have an effect substantially in proportion to the ratio of the number of fluorine atoms in the molecule.

Such a fluororesin powder 23 is made of the R
30 to 2 parts by weight per 100 parts by weight of the rubber component in the FL treatment liquid
It is necessary to add 00 parts by weight (more preferably 50 to 200 parts by weight) to obtain a uniformly dispersed treatment liquid. Also,
The fiber fabric is immersed in the treatment liquid and dried, and a solid mixture 2 containing a fluororesin powder is added to the weight of the fiber fabric before immersion.
It is preferable to adjust the amount of No. 4 to be 5 to 40%. If the amount of the fluororesin powder is less than 30 parts by weight or less than 5%, the total amount of the fluororesin powder entangled in the fiber fabric is small, and the effect of reducing the friction coefficient is hardly recognized. If the amount of the fluororesin powder exceeds 300 parts by weight or exceeds 40%, the total amount of the fluororesin powder entangled in the fiber woven fabric is too large, and the adhesion of the fiber woven fabric to the belt body or the like is reduced, and the belt performance is reduced. You.

Examples of powdery lubricating materials other than fluororesin powder that can be used simultaneously include graphite having a layered structure, molybdenum disulfide, glass beads, ceramic powder, spherical phenol resin powder and aramid, polyamide, polyester, polybenzoxazole, and the like. One or more types of fiber cut yarn or powder can be exemplified. In particular, graphite is well compatible with the rubber component, and further improves the durability of the belt. The powdered antifriction material is a rubber component 10 in the RFL treatment liquid.
It is 30 to 200 parts by weight with respect to 0 parts by weight, and it is preferable to increase the amount of the fluororesin powder added. However, there is no particular limitation on the mixing ratio of the fluororesin powder and the powdered lubricant.

The amount of the mixture adhering to the fiber fabric is measured by measuring the mass (W1) of the fiber fabric before the immersion treatment, and then measuring the RF (fluorocarbon resin powder) in which the fluororesin powder is dispersed.
The fiber fabric is immersed in the L treatment solution, and then the fiber fabric is placed in an oven and dried until the weight becomes constant.
2), and the equation ((W2−W1) / W1) × 100
(%).

In order to entangle a large amount of the fluororesin powder 23 into the interior of the fiber woven fabric , the fluororesin powder 23 must be pulverized or granulated to have an average particle diameter of 100 μm or less (more preferably 10 μm or less). Use the new one. If the thickness exceeds 100 μm, the fluororesin powder settles in the RFL treatment liquid, making it difficult to uniformly disperse it. Further, the surface area of the fluororesin powder in the mixture is reduced, and the effect of reducing the friction coefficient is reduced. From such a viewpoint, the fluororesin powder preferably has a particle size as small as possible, for example, 10 μm or less.

Rubber glue can be further adhered to the fiber woven fabric to which the fluororesin powder has been adhered. In the example of FIG. 1, the above-mentioned fiber woven fabric is made of an isocyanate compound and a rubber compound of the same type as that of the belt body in methyl ethyl ketone (ME
K), dissolved in a solvent such as toluene, impregnated and adhered to the mixed first rubber paste, and then passed through a pair of pressure rolls.
Adjust the amount of rubber glue applied. Then 150-180 °
The first rubber layer 5 is formed by heating and drying at C for 1 to 3 minutes.

The isocyanate compound used here is
The purpose of the present invention is to improve the adhesive strength between the fiber woven fabric to which the fluororesin powder is adhered and the belt body, and specific examples thereof include 4,4'-diphenylmethane diisocyanate, tolylene 2,4-diisocyanate, and polymethylene polyphenyl diisocyanate. , Hexamethylene diisocyanate, polyaryl polyisocyanate (for example, PAPI is a trade name) and the like. This isocyanate compound is also used by being mixed with an organic solvent such as toluene and methyl ethyl ketone. Further, a blocked polyisocyanate in which an isocyanate group of the polyisocyanate is blocked by reacting a blocking agent such as a phenol, a tertiary alcohol, or a secondary alcohol with the above isocyanate compound can also be used.

Examples of the epoxy compound include polyhydric alcohols such as ethylene glycol, glycerin, and pentaerythritol; reaction products of polyalkylene glycols such as polyethylene glycol with halogen-containing epoxy compounds such as epichlorohydrin; Bis (4-hydroxyphenyl) dimethylmethane, phenol. Formaldehyde resin, resorcinol.
Reaction products with polyhydric phenols such as formaldehyde resins and halogen-containing epoxy compounds. The epoxy compound is used by being mixed with an organic solvent such as toluene and methyl ethyl ketone.

Further, in the present invention, the fibrous fabric having the first rubber layer 5 formed thereon is mixed with a fluororesin powder or a lubricating material other than the above-mentioned fluororesin powder in a rubber compound of the same type as that of the belt body, and methyl ethyl ketone ( After dissolving in a solvent such as MEK) and toluene, and impregnating and adhering the mixed second rubber paste, the amount of the second rubber paste adhered is adjusted through a pair of pressure rolls. After that, it is heated and dried at 80 to 150 ° C. for 1 to 3 minutes to adhere the outermost second rubber layer (outermost rubber layer) 6. In this case, the addition amount of the fluororesin powder or the lubricant other than the fluororesin powder is preferably 50 to 400 parts by weight based on 100 parts by weight of the rubber component of the rubber compound.

The method of manufacturing the toothed belt is as follows. The above-described treated fiber woven fabric is machined into a cylindrical shape and inserted into a mold having alternately grooved and projected ridges. , And an unvulcanized rubber sheet forming a belt body is wound thereon. Then, after covering with a jacket, it is moved to a vulcanization process. During vulcanization, the unvulcanized rubber sheet is poured into the groove along with the fiber fabric , and the treated fiber fabric is vulcanized integrally with the belt body to produce a belt sleeve. After removing the vulcanized belt sleeve from the mold, attach it to the two shafts of the cutting machine,
While rotating by applying tension, the sheet is cut to a predetermined width by a cutter to produce a toothed belt.

An example of a method for manufacturing a V-ribbed belt is as follows. First, one or a plurality of treated fiber fabrics and a cushion rubber layer are wound around the peripheral surface of a cylindrical forming drum, and then a cord made of a rope is spun spirally thereon, and further a compressed rubber layer is sequentially formed. After winding to obtain a laminate, it is vulcanized to form a vulcanized sleeve. Next, the vulcanization sleeve is hung between the drive roll and the driven roll, and is run under a predetermined tension, and the rotated grinding wheel is moved so as to abut the running vulcanization sleeve to compress the vulcanization sleeve. A plurality of 3 to 100 groove portions are ground on the surface of the rubber layer at a time. The vulcanized sleeve obtained in this manner is removed from the drive roll and the driven roll, and the vulcanized sleeve is hung on another drive roll and the driven roll to travel, cut to a predetermined width by a cutter, and cut into individual pieces. Finish with a V-ribbed belt.

The weft 7 and the warp 8 of the tooth cloth 4 and the cover canvas 30
Any of nylon, aramid, polyester, polybenzoxazole, cotton, or the like, or a combination thereof can be adopted as the material of the fiber woven fabric that forms the like. The form of the fiber may be any of a filament yarn and a spun yarn, and may be a twisted yarn of a single composition, a mixed twisted yarn, or a mixed spun yarn. It is preferable to use fibers in which the fluororesin powder 23, the rubber component 21 and the resin-based adhesive component 22 of the mixture 24 are so thick that they can be impregnated between the fibers. In the case of a toothed belt, nylon,
Aramid or the like is used. In the case of a V-belt or a V-ribbed belt, cotton yarn or a blend yarn of cotton and polyester is usually used, but especially at a high operating temperature or a high load, polybenzoxazole fiber, polyethylene naphthalate, etc. are also used. .

The weaving structure may include a large amount of the fluororesin powder 23 in any of a twill weave, a satin weave, and a plain weave. In order for the mixture 24 in which the fluororesin powder 23 is dispersed to be effectively impregnated and adhered to the front and back surfaces and the inside of the fiber fabric , the thickness of the yarn is so large that the mixture 24 is in communication with the front and back surfaces and the inside of the fiber fabric. Select the pod density.

When a toothed belt for an automobile is used in a high temperature environment of 100 ° C. or more and a long life of 150,000 km or more is required, H-NBR is used for the belt body. The RFL treatment liquid to be impregnated and attached includes H-
Long life can be achieved using a conventional blend of NBR and CSM latex and VP latex. On the other hand, in the case of a general industrial V-belt, in which natural rubber and SBR are used for the belt body, VP latex, SBR latex and these are used in the RFL treatment liquid impregnated and coated on the back cloth that covers the belt back surface. Can be used.

The material of the rubber compound forming the belt body is not particularly limited, and an appropriate material is appropriately selected according to the conditions of use. H-NB with heat resistance and oil resistance for toothed belts for automobile engines and various engines
R, CR, CSM, etc. are used. Toothed belts used for general industrial machines include NBR, ethylene propylene diene monomer (EP) in addition to H-NBR, CR, and CSM.
DM), ethylene propylene copolymer (EPR), SB
Any of R, isoprene rubber (IR), natural rubber (NR), fluorine rubber, silicon rubber and the like can be used.
In the case of such a toothed belt, the use of the tooth cloth described with reference to FIG. 1 is effective.

Also, V belts for general industry and automobiles,
CR, H-NBR, CSM, N
Rubber compounds such as R and SBR are used. Such a V
In a belt or V-ribbed belt, a back cloth is coated on the back surface. This back cloth is produced by subjecting the same cloth to RFL impregnation and adhesion treatment as that of the tooth cloth, and then treating the surface with rubber glue or rubbing or coating rubber for surface treatment with a rubber calender roll. The effect is that the life of the belt is improved by improving the abrasion due to contact with the driven pulley or idler pulley, and the noise is reduced by reducing the frictional force when the belt back contacts the pulley. It is.

There is no limitation on the core wire 1 embedded in the belt body, and a glass core wire and an aramid core wire are generally used. In addition, polybenzoxazole, polyparaphenylene naphthalate, polyester, acrylic,
Any of twisted cords composed of carbon and steel can be used. The composition of the glass core wire may be either E glass or S glass (high-strength glass), and is not limited by the thickness of the filament, the number of converging filaments, and the number of strands. Further, the present invention is not limited to a sizing agent, an RFL, an overcoat agent, and the like used as an adhesive treatment agent and a protective material for a glass filament during bending. On the other hand, the aramid core wire is not limited by the difference in the molecular structure of the material, the core wire configuration, the size of the filament, or the adhesive treatment agent. Similarly, there is no particular limitation on the twisted cord of the core wire having another composition.

[0043]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to these examples, and can be appropriately changed without departing from the object.

Table 1 shows the fiber fabric for coating having the composition and constitution, Table 2 shows the rubber compound, Table 3 shows the RFL treatment solution, and Table 4 shows the prepared rubber paste.

[0045]

[Table 1]

[0046]

[Table 2]

[0047]

[Table 3]

[0048]

[Table 4]

Example A The fiber woven fabric shown in Table 1 was immersed in an RFL treatment solution containing a fluororesin powder, dried at 120 ° C., and then heat-treated at 180 ° C. for 2 minutes. Next, after dissolving the rubber compound shown in Table 2 in an organic solvent such as MEK or toluene, polyaryl polyisocyanate (trade name P)
The fiber fabric after the RFL treatment was immersed in the treatment liquid to which the (API) was added, and dried to form a first rubber layer. Table 4
20 parts by weight of Nocrack NBC (antiaging agent) are added to 100 parts by weight of the rubber compound of Table 2, and the rubber compound and Nocrack NBC are added to an organic solvent such as MEK or toluene. A treatment liquid was prepared by adding a treatment liquid having a concentration of about 15% with respect to the mixed liquid, and adding a fluorine resin, graphite, molybdenum disulfide, or the like. The weave of fibers forming the first rubber layer
A second rubber layer (outermost rubber layer) was formed by immersion in the treatment liquid and drying to obtain a treated fiber woven fabric (tooth cloth) for covering the belt body.

Next, the above-mentioned tooth cloth was wound around a mold for producing a belt, and a core wire (glass fiber, 1.2 mm diameter) bonded to the pair of SZ twisted RFL and isocyanate shown in Table 5 was fixed at a constant pitch ( (1.4 mm), and spirally wound with a constant tension on the spiral.
Rubber sheet was stuck. Further, the mixture is put into a vulcanization can to form a tooth profile by a normal press-fitting method.
After pressure vulcanization for 0 minutes, the back surface of the belt was polished to a certain thickness and cut to a certain width to obtain a toothed belt.

[0051]

[Table 5]

The size of the produced belt was 15 belt widths.
mm, belt tooth shape Y (8.0 mm pitch), number of teeth 105
And usually displayed as 105Y15. As a traveling test device, the number of drive pulley rotations is 7200 rpm with the number of drive pulley teeth 19 and the number of driven pulleys 38, and the driven pulley load is 7.
5kW, initial tension 350N, ambient temperature 130 ° C
A high-load, high-tension, high-temperature running test was performed under the conditions set in the above. Tables 6 to 8 show the life time and failure mode in the durability test together with the belt configuration.

[0053]

[Table 6]

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

In Examples 1 to 4 , a tooth cloth containing a fluororesin powder was further subjected to a rubber paste treatment in which a fluororesin powder and another friction coefficient reducing agent were added as additives to a rubber paste containing H-NBR. is intended for confirming the effect of the case was. As a rubber glue additive, a fluororesin, a dihydrated molybdenum, a graphite, and an aramid fiber powder are added, which further improves the belt life.

[0061]

Example B In the same manner as in Example A, the V-belt, the V-ribbed belt, and the speed-changing V-belt were also impregnated with the RFL treatment liquid containing the fluororesin powder on the back cloth coated on the back of each belt. It was confirmed that there was no occurrence of adhesive wear on the back of the belt, and that there was little noise.

[0063]

The treated fiber woven fabric for a power transmission belt according to the present invention described above.
According to the product , an untreated fiber woven fabric is impregnated with a first treatment liquid in which a powdered lubricant containing at least a fluororesin powder is dispersed in a resorcinol-formalin-rubber latex treatment liquid, and then dried to remove the lubricant from the fiber fabric. After bundling between the front and back surfaces and between the fibers, impregnated with a second treatment liquid composed of rubber paste, dried and adhered to the unvulcanized first rubber layer, and furthermore, a fluorine resin is added to the rubber paste.
Add powdered anti-friction material other than grease powder or fluororesin powder
Impregnated with the added third processing solution, dried and unvulcanized
Located transmission belt for processing fiber fabric attached the beam layer, a large amount of fluorine resin powder resorcinol - through the solid content of the resin component and a rubber latex is the initial condensate of formalin fibers
Can be focused on or near the surface of the fabric , protects the abrasion of the treated fiber fabric , maintains a low coefficient of friction for a long time, and also has an anti-friction material on the outermost coated rubber layer
To further protect the abrasion of the treated fiber fabric.
The effect is that the low friction coefficient can be maintained for a long period of time .

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view showing a structure of a main part of a toothed belt obtained by a manufacturing method of the present invention.

FIG. 2 is a perspective view showing the entire structure of a toothed belt obtained by the manufacturing method of the present invention.

FIG. 3 is a sectional perspective view of a V-ribbed belt obtained by the manufacturing method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 core wire 2 back part 3 tooth part 4 tooth cloth 5 first rubber layer 6 second rubber layer 7 weft 8 warp 9 rubber compound 11, 12 boundary 21 rubber component 22 resin-based adhesive component 23 fluororesin powder 24 mixture

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-126974 (JP, A) JP-A-64-33275 (JP, A) JP-A-4-82970 (JP, A) (58) Investigation Field (Int. Cl. ⁷ , DB name) D06M 15/00-15/72

Claims (6)

(57) [Claims] The whole or part of the surface of the power transmission belt is made of fibers.
A treated fiber woven fabric for a power transmission belt coated with a woven fabric , wherein the untreated fiber woven fabric is impregnated with a first treatment liquid in which a powdered lubricant containing at least a fluororesin powder is dispersed in a resorcinol-formalin-rubber latex treatment liquid; After drying, the antifriction material is bundled between the front and back surfaces of the fiber woven fabric and between the fibers, and then impregnated with a second treatment liquid made of a rubber paste, dried and adhered to an unvulcanized first rubber layer, In addition, fluororesin powder or
Third treatment with addition of powdered lubricant other than fluororesin powder
The treated fiber woven fabric for a power transmission belt, wherein the treated fiber woven fabric is impregnated with a liquid, dried, and adheres an unvulcanized outermost rubber layer . 2. An isocyanate compound or an epoxy compound is added to the rubber paste of the second treatment liquid.
A treated fiber woven fabric for a power transmission belt according to the above. 3. The fluororesin powder is added in an amount of 30 to 200 parts by weight based on 100 parts by weight of a solid content of rubber latex of a resorcinol-formalin-rubber latex treatment liquid, and the particle diameter is 100 μm or less. A treated fiber woven fabric for a power transmission belt according to the above. 4. The treated fiber fabric for a power transmission belt according to claim 3, wherein the fluororesin powder is an aqueous dispersion. 5. The method according to claim 1, wherein the fluororesin powder is polytetrafluoroethylene.
Tylene, polytrifluoroethylene, tetrafluoroe
Tylene-hexafluoropropylene copolymer, tetraf
Fluoroethylene-perfluoroalkoxyethylene copolymer
Coalesce, from tetrafluoroethylene-ethylene copolymer
Claim 1, 2, 3, or at least one selected from
Is a treated fiber woven fabric for a power transmission belt according to 4 . 6. A powdery anti-friction material other than fluororesin powder is used.
Graphite, molybdenum disulfide, glass beads, ceramic
Powder, spherical phenol resin powder and aramid, poly
Amide, polyester, polybenzoxazole, fiber
At least one selected from cut yarn or powder
The treated fiber woven fabric for a power transmission belt according to claim 1 .