JPH0859897A - Rubber composition - Google Patents

Abstract

PURPOSE: To provide an additive which can prevent a rubber composition from foaming when vulcanized, can act as a useful filler for rubber, and does not adversely affect the vulcanization of rubber. CONSTITUTION: This composition is one prepared by milling blast-furnace slag as an essential component which substitutes for part of a common filler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a UHF by an extruder.
The present invention relates to a rubber composition having high physical properties suitable for vulcanization, HAV vulcanization, can vulcanization, rotocur vulcanization and press vulcanization.

[0002]

2. Description of the Related Art Conventionally, as a rubber composition, it has been general to add clay, white carbon, calcium carbonate, carbon black and a vulcanizing agent, a vulcanization accelerator and a softening agent to a rubber. However, in some cases, a method of foaming during vulcanization is unsuitable as a product, and in order to prevent foaming, calcium oxide (CaO) is kneaded in to make foaming inconspicuous in appearance. In this case, the physical properties of the vulcanizate are lowered and the pH of the compound is increased, which affects the vulcanization rate and the number of compounded parts is usually limited.

[0003]

The problem to be solved by the present invention is to prevent foaming that occurs during vulcanization of a rubber composition, and to itself act as a useful filler for rubber. By providing an additive that does not affect the vulcanization of rubber, it is possible to provide a rubber composition having high physical properties excellent in heat resistance, acid resistance, etc., which has not been obtained in the past.

[0004]

[Means for Solving the Problems]

[Outline] In order to solve the above-mentioned problems, the present inventor has conducted earnest research, and as a result, the blast furnace slag is described as fine particles and important matters related to the invention.

[Polymer] Natural rubber, SBR, NBR, CR, EPD
Any polymer that is usually called an elastomer, such as M, BR, IR, IIR, epichlorohydrin rubber, hypalon, and chlorosulfonated polyethylene may be used.

[Compounding agent] Commonly used additives such as vulcanizing agents, vulcanization accelerators, vulcanizing rib agents, and softening agents can be used.

[Filler] Any commonly used filler such as clay, calcium carbonate, white carbon, carbon black, and talc can be used.

[Blast furnace slag] The blast furnace slag is an essential component according to the present invention. Examples of commercially available products include those manufactured by Kobe Steel (Kayment ^{▲ R ▼} ),
There are products made by Nippon Steel (S-met ^R ).

[Blending Ratio] The preferable blending amount of blast furnace slag in the rubber composition varies in a considerable range depending on the application, but is generally 0.5 to 70 parts by weight with respect to the rubber composition (100 parts by weight). It is preferably within the range.

[0005]

Although the function of the present invention is unclear, it is presumed that the slag quickly absorbs the water mixed from the atmosphere of the polymer, the rubber chemicals, and the filler, and prevents the foaming due to the water taken into the skeleton of the slag. Moreover, it is considered to provide a rubber composition having excellent physical properties.

[0006]

EXAMPLES Hereinafter, the modes and effects of the present invention will be specifically described by way of examples, but each exemplification is, of course, for the purpose of explanation, and does not mean a limitation or limitation of the inventive idea. The rubber compositions of Examples are shown in Table-1 and Comparative Examples are shown in Table-1.
Shown in 2. Then, the above rubber composition was molded into a 20 m / m width × 5 m / m thickness with a 75φ vent type extruder (L / D = 16) and continuously heated with a HAV vulcanizer to obtain physical properties and specific gravity. Compared. The results of Examples are shown in Table-3, and the results of Comparative Examples are shown in Table-4.

As described above, according to the results of Examples and Comparative Examples,
Foaming was observed in the comparative example, but foaming was not observed in the example and improvement in physical properties was observed.

INDUSTRIAL APPLICABILITY As described above, the present invention provides a composition suitable for various vulcanization methods, is a processing method superior to conventional ones, and has flexibility. In addition, it is an epoch-making invention that can be applied to a wider range of applications as a product of higher quality.

[0008]

[Table-1]

[0009]

[Table-2]

[0010]

[Table-3]

[0011]

[Table-4]

Claims (1)

[Claims] 1. A rubber composition characterized by kneading blast furnace slag as an essential component.