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Transmission belt

A technology for transmission belts and rubber layers, applied in the field of transmission belts, can solve the problems of reduced durability of toothed belts, less carbon black ratio, peeling, etc., and achieve the effects of inhibiting peeling, improving wear resistance and modulus, and improving durability.

Pending Publication Date: 2018-12-21
MITSUBOSHI BELTING LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ethylene-α-olefin elastomer is non-polar because the main chain does not have unsaturated bonds, so it has excellent heat resistance and cold resistance, but on the other hand, it is very difficult to adhere to fibers
For example, rubber toothed belts based on EPDM have the following problems: the adhesive force between EPDM and the cover cloth or the core wire is insufficient, and the rubber or the cover cloth at the tooth root portion is thermally deteriorated especially during running at high temperatures , and repeated deformation, therefore, peeling occurs between the rubber and the core wire to form missing teeth, or peeling occurs at the interface between the cover cloth and the rubber, thereby greatly reducing the durability of the toothed belt
[0007] However, in this toothed belt, although an organic peroxide is used as a crosslinking agent, the organic peroxide attacks the resorcinol resin as the adhesive treatment agent for the cover cloth and deteriorates its curing. Adhesion to cover cloth
In addition, in the toothed belt, the stress is concentrated on the tooth root, so the tear resistance of the rubber is also important, but the tear resistance is not sufficient because it is cross-linked with an organic peroxide.
In addition, the adhesive force between the rubber part and the core wire may be insufficient because the ratio of the melamine compound to the silica is small, and the mechanical properties such as abrasion resistance and modulus may be insufficient due to the low ratio of carbon black.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10 and comparative example 1～6

[0116] The rubber composition shown in Table 1 was used to prepare samples, and the results of evaluations of hardness and 50% tensile stress, core wire peeling force, canvas peeling force, and carry-over durability are shown in Table 1.

[0117]

[0118] From the results of Table 1, it can be judged that the transmission belts of Examples 1 to 10 have reached a traveling time of 300 hours or more, and have practically sufficient durability.

[0119] It should be noted that in Example 6, the mass ratio of the melamine resin to the silica was as low as 5% by mass, and the tooth loss failure occurred when the traveling time was 350 hours.

Embodiment 7

[0120] Example 7 is under the condition that the mass ratio of the melamine resin to the silica is as high as 60% by mass, and the tooth loss failure occurs after 300 hours.

[0121] In addition, in Example 8, under the conditions that the compounding amount of silica was as high as 50 parts by mass and the compounding amount of carbon black was as little as 20 parts by mass, the cover fabric peeling failure occurred after 300 hours.

[0122] In addition, Example 9 was a condition in which a resorcinol resin was added, and a tooth loss failure occurred at 300 hours. In contrast, in Example 2 where the resorcinol resin was not added, the belt ran for 400 hours without failure. Therefore, it can be judged that the addition of the resorcinol resin does not contribute to the improvement of durability.

[0123] In addition, Example 10 was a condition containing a guanamine resin as an amino resin, and compared with Comparative Example 1, an increase in hardness and tensile stress was obse...

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Abstract

The present invention relates to a transmission belt which is provided with: a rubber layer that is formed from a vulcanized product of a rubber composition which contains a rubber component containing an ethylene-alpha-olefin elastomer, a filler containing silica, a vulcanizing agent containing a sulfur-based vulcanizing agent, and a curable resin containing an amino resin; and a fiber member that is in contact with the rubber layer.

Description

Technical field [0001] The present invention relates to a transmission belt such as a toothed belt with a transmission surface (meshing transmission surface) covered by a fiber material (tooth cloth). Background technique [0002] Fiber reinforced materials containing rubber and fibers are used in industrial products such as tires, belts, hoses, and rubber cloth. Among these industrial products, as rubbers widely used in transmission belts, ethylene-α-olefin elastomers such as ethylene-propylene-diene copolymer rubber (EPDM) are known. Ethylene-α-olefin elastomers are non-polar because they do not have unsaturated bonds in the main chain. Therefore, they have excellent heat resistance and cold resistance, but on the other hand, adhesion to fibers is very difficult. For example, rubber toothed belts using EPDM as a base material have the following problems: EPDM has insufficient adhesion with the cover cloth or core wire, especially when the rubber or cover cloth at the root of t...

Claims

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Application Information

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IPC IPC(8): F16G1/08C08K3/04C08K3/06C08K3/36C08L23/16C08L61/20C08L61/28F16G1/00F16G1/28
CPCC08L23/16C08L61/20F16G1/00F16G1/08F16G1/28C08L61/28C08K3/04C08K7/04C08K2201/019C08K3/36C08K5/0025C08K3/06F16G5/06F16G5/20C08J5/0405
Inventor 尾崎利树日根野顺文矶江俊介
Owner MITSUBOSHI BELTING LTD
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