Reinforcing cord for rubber reinforcement and rubber product including the same

a technology of reinforcing cords and rubber products, applied in the direction of yarns, textiles and papermaking, etc., can solve the problems of deterioration of performance, separation between reinforcing fibers and rubber matrix, deterioration of strength, etc., and achieve excellent dimensional stability, high bending fatigue resistance, and high strength. the effect of elasticity

Inactive Publication Date: 2007-06-28
NIPPON SHEET GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] With such a situation in mind, the present invention is intended to provide a reinforcing cord for rubber reinforcement having high strength, elasticity, and bending fatigue resistance, and a rubber product including the same.
[0009] According to the present invention, a reinforcing cord for rubber reinforcement can be obtained that has high strength, elasticity, and bending fatigue resistance and is excellent in dimensional stability. Particularly, when a polyarylate fiber strand and glass fiber strands are combined in a specific arrangement, a reinforcing cord for rubber reinforcement can be obtained that has considerably high bending fatigue resistance. The rubber product of the present invention includes the above-mentioned cord and therefore has high strength, elasticity, and bending fatigue resistance and is excellent in dimensional stability.

Problems solved by technology

However, these rubber products are subjected to bending stress repeatedly and thereby the performance thereof tends to deteriorate due to bending fatigue.
This tends to cause separation between reinforcing fibers and a rubber matrix, or deterioration in strength due to fraying of the reinforcing fibers.
In the conventional cords, however, it was difficult to achieve a balance between the strength and the flexibility.
In this cord, however, bending fatigue tends to occur and thereby the strength thereof tends to deteriorate, which has been a problem.

Method used

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  • Reinforcing cord for rubber reinforcement and rubber product including the same
  • Reinforcing cord for rubber reinforcement and rubber product including the same

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

[0013] In Embodiment 1, the description is directed to a reinforcing cord for rubber reinforcement of the present invention. A reinforcing cord for rubber reinforcement of the present invention includes reinforcing fibers. The reinforcing fibers include polyarylate fibers and a plurality of strands (outer strands) that are arranged around the polyarylate fibers. The outer strands include fibers (hereinafter may be referred to as “second fibers” in some cases) other than polyarylate fibers.

[0014] The polyarylate fibers are wholly aromatic polyester fibers. They can be obtained through polycondensation of dihydric phenol (for example, bisphenol A) and aromatic dicarboxylic acid (for example, phthalic acid or isophthalic acid).

[0015] Preferably, the second fibers are fibers whose flexibility in bending is higher than that of the polyarylate fibers. Examples of the second fibers to be used herein include glass fibers, polyparaphenylene benzobisoxazole fibers, carbon fibers, aramid fib...

embodiment 2

[0032] In Embodiment 2, the description is directed to a rubber product of the present invention. The rubber product of the present invention includes at least one reinforcing cord for rubber reinforcement described in Embodiment 1. This reinforcing cord for rubber reinforcement may be a rope structure. Furthermore, a plurality of reinforcing cords for rubber reinforcement may be arranged and embedded in the shape of a sheet.

[0033] The rubber product of the present invention is not particularly limited as long as it is a rubber product reinforced effectively with the reinforcing cord for rubber reinforcement. Typical examples of the rubber product of the present invention include rubber belts such as a toothed belt and a move belt, and a rubber crawler.

[0034] In the rubber product of the present invention, the ratio of the reinforcing cord for rubber reinforcement to the rubber product is approximately 10 to 70 wt. %, for example.

example

[0035] Hereinafter, the present invention is described further in detail using examples. In the examples, reinforcing cords for rubber reinforcement of the present invention and comparative examples were produced, and then the characteristics thereof were evaluated.

Sample 1

[0036] A reinforcing cord for rubber reinforcement of the present invention was produced by the following method. First, a resorcinol-formaldehyde condensate (with a solid content of 8 wt. %), vinyl pyridine-styrene-butadiene latex (with a solid content of 40 wt. %), and CSM (with a solid content of 40 wt. %) were mixed together in such a manner as to have a solid content mass ratio of 2:13:6. Thus, a RFL treatment solution was prepared. This RFL treatment solution was applied to a strand (with a diameter of approximately 0.8 mm; a non-twisted product) formed of polyarylate fibers (with an elastic modulus of 106 GPa and a density of approximately 1.41 g / cm3; Vectran (Trade Name); manufactured by KURARAY CO., LT...

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Abstract

A reinforcing cord for rubber reinforcement of the present invention includes reinforcing fibers. The reinforcing fibers include polyarylate fibers 11 and a plurality of outer strands 12 that are arranged around the polyarylate fibers 11. The plurality of outer strands 12 include fibers other than polyarylate fibers. The use of this reinforcing cord for rubber reinforcement makes it possible to obtain a reinforcing cord for rubber reinforcement having high strength, elasticity, and bending fatigue resistance, and a rubber product including the same.

Description

TECHNICAL FIELD [0001] The present invention relates to a reinforcing cord for rubber reinforcement and a rubber product reinforced with a reinforcing cord for rubber reinforcement. BACKGROUND ART [0002] Reinforcing fibers such as glass fibers and aramid fibers have been used as reinforcing materials for rubber products such as rubber belts, tires, etc. However, these rubber products are subjected to bending stress repeatedly and thereby the performance thereof tends to deteriorate due to bending fatigue. This tends to cause separation between reinforcing fibers and a rubber matrix, or deterioration in strength due to fraying of the reinforcing fibers. On the other hand, a toothed rubber belt that is used for a camshaft drive of an internal-combustion engine of an automobile requires high dimensional stability in order to maintain appropriate timing. Furthermore, rubber belts that are used for not only the camshaft drive but also an auxiliary drive of, for instance, an injection pum...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D02G3/00D02G3/44
CPCD02G3/447
Inventor KAJIHARA, KEISUKE
Owner NIPPON SHEET GLASS CO LTD
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