JPH04126101A - Production of rubber shoe sole - Google Patents

Abstract

PURPOSE:To obtain the shoe sole which is soft and strong, has adequate impact resistance and repulsion force, and has a beautiful surface free from staining by adding respectively specific ratios of vulcanization accelerators to natural rubber or synthetic rubber and polynorbornene resin and applying a rubber adhesive of the same kind between both in an unvulcanized state, then laminating both and subjecting both to pressurizing and vulcanization molding under heating. CONSTITUTION:The vulcanization accelerator of the amt. smaller by 10 to 20% than usual is added to the natural rubber or synthetic rubber and the vulcanization accelerator of 3 to 4 times the amt. of the natural rubber or synthetic rubber is added to the polynorbornene resin in the production of the shoe sole consisting of the composite of the plate materials of the natural rubber or synthetic rubber and the polynorbornene resin. The rubber adhesive of the same kind as the natural rubber or synthetic rubber is applied between both in the unvulcanized state and thereafter both are laminated and are subjected to the pressurizing and vulcanization molding under heating. Namely, the shoe sole having a good wearing feel and good repulsion property is obtd. while maintaining the characteristics inherent to the polynorbornene resin, i.e., low hardness high mength and vibration absorbing effect is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a rubber shoe sole that is quiet and prevents pedestrians from slipping, and has impact resistance and resilience. It can be used as a sole for various types of shoes, such as fishing shafts and sports shafts.

Conventional technology Polynorbornene resin, a type of shape memory resin, is made into a rubber-like elastic material by kneading it with oil, etc., and has the characteristics of being soft and strong, so it is already used in sports shoes. It is used as part of the sole of shoes. Polynorbornene resin, which is conventionally used in sports shoes, can be made into a plate shape and used as an insole, or by making the rubber of the sole into a hollow shape and inserting a plate-like body into the hollow part. It is used for the purpose of improving the cushioning properties and impact resistance of shoe soles.

Problems to be Solved by the Invention Conventionally, in the case of polynorbornene resin used for shoe soles, the sole insole was used as a single elastic plate, and when it was inside the sole, it was inserted into the hollow part of the sole. However, since they are used alone, the softness and strength of polynorbornene resin are utilized, but they are too soft and have little repulsive force. These shoes were not comfortable to wear.

In addition, especially in the case of insoles, vulcanization accelerators and fillers that are mixed into the polynorbornene resin to give it elasticity precipitate on the surface after the resin hardens, staining the surface of the elastic board.
They have the disadvantage of staining the soles and socks when worn.

Means for Solving the Problems In order to solve the above-mentioned conventional drawbacks, the present invention takes advantage of the softness and strength of polynorbornene resin, and also provides a shoe sole that has appropriate impact resistance and repulsion, and is stain-free. The present invention relates to a method of manufacturing a shoe sole that can obtain a beautiful surface.

That is, in the production of shoe soles using a composite of plates of natural rubber or synthetic rubber and polynorbornene resin, the present invention provides a method in which the natural rubber or synthetic rubber has a normal 10 to 10% b, and the polynorbornene resin has a natural rubber or synthetic rubber of 3 to 50%. After adding four times the amount of vulcanization accelerator and applying a rubber adhesive of the same quality as the natural rubber or synthetic rubber between the unvulcanized two, the two are laminated and pressed and heated. This is a method for manufacturing rubber shoe soles, which is characterized by sulfur molding.

Function: The sole according to the present invention can provide shoes that have appropriate softness and strength for indoor and sports shoes, and have the impact resistance and repulsion that are most necessary for walking and running. In addition, when creating the composite material that makes up the sole of a shoe, an integrated product is obtained by laminating two types of rubber, and natural rubber or synthetic rubber with a small amount of vulcanization accelerator is used.
This prevents the vulcanization accelerator in the polynorbornene resin from migrating and depositing cloudy particles on the surface of the soft and strong polynorbornene resin that forms the surface of the sole. If the amount of this vulcanization accelerator added to natural rubber or synthetic rubber is less than 30% of the normal amount, vulcanization will not occur, and if the amount is more than 10% less than the normal amount, vulcanization will not occur. Precipitation of cloudy particles is observed on the surface of polynorbornene resin. Further, the amount of vulcanization accelerator added to the polynorbornene resin is 3 to 4 times that of natural or synthetic rubber to ensure sufficient migration and is optimal for obtaining an effective curing time.

Example A total of 1.35 parts of dibenzothiazyl disulfide and tetramethylthiuram disulfide as vulcanization accelerators were added to 100 parts of SBR rubber and kneaded to prepare a plate-like product.

Next, a total of 4 parts of tetrabutylthiuram disulfide and tellurium dithiocarbamate as vulcanization accelerators were added to 100 parts of the polynorbornene resin, and the mixture was kneaded to form a plate-like product.

A viscous SBR adhesive is applied to the surface of the SBR rubber, and a polynorbornene resin plate is laminated on the applied surface.
Vulcanization was carried out at 150 kg for 7 minutes at 150 kg. A part of the composite plate-shaped material obtained in this way was cut out and the absorption spectrum was observed using an ultraviolet-visible spectrophotometer. As a result, the presence of vulcanization additives tetrabutylthiuram disulfide and tellurium dithiocarbamate in the SBR rubber was confirmed. It was done. Therefore, it was found that the vulcanization accelerator of the polynorbornene resin migrated into the SBR rubber. This composite plate-like material was cut into a shoe last to obtain a shoe sole.

Effects of the Invention The sole obtained by the present invention has the following effects.

In other words, while maintaining the characteristics of polynorbornene resin, such as low hardness, high strength, and vibration absorption effect, a sole with extremely good resilience and comfort is obtained, making it very distinctive especially for indoor use and sports shoes. It became possible to manufacture shoes. In addition, as a general use shoe, a shoe with a soft and good walking feeling can be obtained.

Furthermore, there is no precipitation of dirt due to cloudy particles on the polynorbornene resin surface of the sole surface, resulting in an extremely beautiful sole surface.

Claims (1)

[Claims] (1) In manufacturing shoe soles using composites of natural rubber or synthetic rubber and polynorbornene resin plates, a vulcanization accelerator is added to the natural rubber or synthetic rubber in an amount 10 to 30% less than the usual amount, and polynorbornene A vulcanization accelerator is added to the resin in an amount 3 to 4 times that of natural rubber or synthetic rubber, and a rubber adhesive of the same quality as the natural rubber or synthetic rubber is applied between the unvulcanized parts. A method of manufacturing a rubber shoe sole, which comprises laminating the two together and subjecting them to pressure, heat, and vulcanization molding.