JPH02243713A - Fine wire for reinforcing rubber and elastomer and manufacture thereof - Google Patents

Abstract

PURPOSE:To improve sticking of fine wire to rubber and elastomer by executing shot peening treatment to a fine wire, etc., made of metal, etc. CONSTITUTION:The fine wire for reinforcing the rubber and elastomer is the fine wire which is subjected to the shot peening treatment uniformly projecting the hard granule on the whole circumferential face thereof. Here, the fine wire for reinforcement includes metal wire, plating treated wire thereof and non-metal series fine wire of glass fiber, carbon fiber, synthetic fiber, etc., and cord strand, network body, texture, braided body thereof. In the manufacture of the fine wire for reinforcement, e.g. the fine wire 1 for reinforcement is fed from a supplying bobbin 7 and passed through the whole circumferential projection nozzle or between plural nozzles 3 while shifting at the fixed velocity to concentratedly project the shot particles 4 on surface of the fine wire 1. By this method, fine recessed face deformation is uniformly formed on the whole circumference of the surface, and the fine wire having good stickness to the rubber, etc., and preventing lowering of sticking efficiency with the lapse of time, is obtd.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to small diameter materials for fine wires and cords used for reinforcing rubber products and elastomer products such as automobile tires, high-pressure rubber hoses, conveyor belts, and timing belts. and its manufacturing method.

[Prior Art] Techniques for improving the strength and durability of rubber and elastomer products by compounding various reinforcing materials into rubber and elastomer products have been widely applied.

For example, glass fibers, carbon fibers, etc. composited in elastomers are known in automobile tires that use steel cords as reinforcement for rubber.

Among the required qualities of these composite materials, the most universal requirement is the adhesion of the reinforcing material to the composite substrate, ie, rubber and nidistomer.

In order to improve the adhesion of reinforcing materials to composite substrates, steel in rubber products is subjected to a plus plating treatment, and glass fibers in synthetic resins are subjected to silane treatment. Particularly in steel radial tires that use steel cords, adhesion between the steel cords and rubber is an important issue. Regarding this adhesion, various studies have been conducted and improved in terms of the twist structure of the steel cord, the plating composition, and the rubber composition. However, it is insufficient to prevent the adhesion performance from decreasing over time in various environments, which is required in addition to adhesion during product manufacturing.
The challenge is to solve this problem.

The main methods proposed to improve the adhesion of steel cord to rubber include adjusting the copper component in the plus plating, modifying the extreme surface layer of the plating, and adding third elements such as cobalt and chromium to the plus plating composition. However, it is difficult to control the manufacturing process, and it has not been established as a method to ensure stable rubber adhesion.

[Problems to be Solved by the Invention] An object of the present invention is to provide a thin reinforcing wire with improved adhesion to a base material, a braided body thereof, and a manufacturing method for a composite material based on rubber and an elastomer. do.

[Means for Solving the Problems] In order to achieve the above object, the present inventor investigated the adhesion interface between rubber and elastomer and the surface of thin wire, and found that the adhesion force is between the positive plating layer of the steel wire on the rubber, or on the elastomer. In addition to chemical bonds that occur between silane-treated layers and borane-treated layers of nonmetallic fibers,
It has been found that the composite base material is also significantly affected by so-called mechanical bonding, which bites into the uneven surface of the reinforcing material.

Therefore, as a result of research focusing on surface modification by making the surface of the reinforcing element uniform and giving it a fine concave surface, we found that by projecting fine and hard particles such as glass grains and iron grains onto the surface of the reinforcing material. , it was discovered that the adhesion performance with rubber and elastomer was significantly improved, and the present invention was achieved. That is, the present invention provides a thin reinforcing wire that has improved adhesion to rubber and Ex-1-peening by subjecting a thin-diameter wire-like body to Shock 1-peening treatment.

Here, the reinforcing fine wire refers to metal wire, its plated wire,
It also includes non-metallic thin wires such as glass fibers, carbon fibers, and synthetic fibers, as well as their coated twists, nets, woven fabrics, and braided bodies. Furthermore, the present invention can be applied to all metal platings conventionally used as reinforcing materials for rubber products, such as zinc plating and nickel plating, in addition to the copper-zinc alloy that is used for plating.

The thin reinforcing wire and its braided body with improved adhesion to rubber and elastomer of the present invention are subjected to shot peening treatment in which hard particles are uniformly projected over the entire circumference of the reinforcing wire while continuously running at a constant speed. Manufactured by process.

In order to improve the adhesion with rubber and X-mer, it is necessary to uniformly apply fine concave plastic deformation to the entire circumferential surface of the thin reinforcing wire and its braided body.

For this purpose, either the thin reinforcing wire and its braided body are passed through a shot peening treatment device while rotating, or the structure shown in FIG. Alternatively, there is a method of passing the shot peening through a shot peening device having a plurality of projection nozzles as shown in FIG.

In this method, the reinforcing thin wire is sent out from the supply bobbin 7, passes through the circumferential projection nozzle 2 or between the plurality of projection nozzles 3 while moving at a constant speed, and is collected by the winding bobbin 8. Projection nozzle 2. 1, the shot particles 4 are sucked together with the compressed air 5 supplied from the compressor 6, and shot particles 4 are concentratedly projected onto the surface of the thin reinforcing wire 1 from the nozzle hole.

In this way, the surface of the thin reinforcing wire 1 can be made uniform over the entire circumference and a fine concave deformation can be formed.

The shot grains are suitably spherical and have a particle size smaller than the wire diameter of the reinforcing thin wire, and have a hardness greater than the material hardness of the reinforcing thin wire. In this case, the strength of the shot should not be excessive so as to impair the original strength of the thin reinforcing wire, and when processing the material after plating, the strength of the shot should not be so high as to prevent peeling of the plating film. It is necessary to do so.

[Function] At the contact surface between the pressure-molded rubber and elastomer and the thin reinforcing wire whose surface layer is plastically deformed by shot projection and becomes a uniform fine concave surface, the rubber and nydistomer base material is microscopically deformed into the concave portion. Intrusion occurs. This provides resistance to shear slippage that occurs at the boundary between the rubber and nidistomer and the thin reinforcing wire that are loaded during use of the rubber product.
It is estimated that this is a mechanical bonding force added to the chemical adhesion force generated on the surface layer of the steel wire plus plating film and the silane-treated film of glass fiber, resulting in a large improvement in adhesion as a whole.

[Example: Positive plating with copper content of 65% and wire diameter of 0.3 mm.
A two-stranded steel wire cord was subjected to shot peening using hard glass beads of 0.15 to 0.3 mm using the apparatus shown in FIG.

The projection conditions were a compressed air pressure of 5 kg/cm 2 and a processing linear speed of 20 m/min.

For the rubber adhesion test, an embedded test piece with a depth of 15 mm was prepared in accordance with the method described in JIS G3510.

The composition of the rubber used in the test is shown in Table 1, and vulcanization was performed at 150° C. for 30 minutes.

Table 1 To determine the adhesion of the rubber, a pulling force measurement test was conducted 24 hours after production and after 150 hours of high temperature and high humidity treatment in an atmosphere of 40° C. and 90% relative humidity. The test results are shown in Table 2.

[Effects of the Invention] According to the present invention, the adhesion performance with rubber and elastomer can be significantly improved by forming surface recesses on the reinforcing thin wire and the braided body by shot peening treatment.

[Brief explanation of drawings]

Figure 1 shows an example of the method for manufacturing the rubber and elastomer reinforcing fine wire of the present invention by shot projection, and is a schematic diagram when a full-circle projection nozzle is used. It is an example of a manufacturing method apparatus, and is a schematic diagram in the case of using a plurality of projection nozzles from the right angle direction of the reinforcing thin wire. 1: Reinforcement fine wire, 2: All-around projection nozzle, 3: Projection nozzle, 4 Rainbow jet grains, 5: Compressed air, 6: Compressor, 7: Supply bobbin, 8: Winding bobbin.

Claims (5)

[Claims] (1) Thin metal wire for reinforcing rubber and elastomer, which has been subjected to shot peening treatment to improve adhesion to rubber and elastomer. (2) Fine metal wire for reinforcing rubber and elastomer, which has been shot-peened to improve adhesion to rubber and elastomer. (3) Non-metallic thin wire for reinforcing rubber and elastomer, which has been subjected to shot peening treatment to improve adhesion to rubber and elastomer. (4) Claim (1) wherein the shot peening treatment is a shot peening treatment in which a thin wire is continuously run at a constant speed and hard particles are uniformly projected over the entire circumference of the wire.
Or the method for producing fine wire for reinforcing rubber and elastomer according to (2) or (3). (5) The adhesion to rubber and elastomer is improved by applying shot peening treatment to uniformly project hard particles over the entire circumference of the braided body of fine wires while continuously running at a constant speed. Improved method for manufacturing fine wire braids for rubber and elastomer reinforcement