DE923219C - Process for the production of rubber compounds - Google Patents

Description

Process for the production of rubber mixtures It has been found that the properties of rubber compounds from natural rubber, synthetic Rubber or its regenerated materials or mixtures can significantly improve it, if you add amine salts of sulfonic acids, alkyl sulfuric acid esters to the mixtures on the roll or in the kneader or mixtures of these incorporated.

The amine salts to be added according to the invention have a particular effect an increase in the tear resistance, tear resistance or stability of the rubber mixtures.

This improvement in physical properties becomes particular achieved in such rubber compounds, the white or light-colored fillers, such as. B. Magnesium oxide, aluminum hydroxide, clay gel, kieselguhr, silica gel, chalk, Calcium silicate, aluminum silicate, active zinc oxide etc. or mixtures of these substances, possibly also with carbon black. To facilitate the processing of the rubber compounds the amine salts mentioned can optionally be used in the form of their aqueous solutions or small amounts of water are added to the rubber compounds.

The amine salts according to the present invention can be added to the rubber compounds, optionally together with amine salts of carboxylic acids, plasticizers, dispersants etc., can be added.

The beneficial effect of the present invention to be applied Amine salts are explained using the examples below.

Example i An approach consisting of natural rubber (smoked sheets 50, crepe 50) 100, sulfur 2.5, zinc oxide 8, reaction product of mercaptobenzothiazole with diethylamine i, ceresin i, phenyl-ß-naphthylamine 1,2, calcium silicate 30, German activated carbon io, when 6.5 parts of diethylcyclohexylamine salt of alkylbenzenesulfonic acid are added, containing an aliphatic chain with two carbon atoms, vulcanizates with the following properties Tear- rupture- tear- .elastic-. ferment strength elongation strength strength ghore kg / cm2 ° i ö kg / cm o% 237 I 593 (49.5 I 48 I 55 Without the addition of the diethylcyclohexylamine salt of the alkylbenzenesulfonic acid, the above mixture gives vulcanizates with the following properties:. . 87 1 58 0 1 3.6 @ 51 1 31 Example 2 An approach consisting of natural rubber (smoked sheets 50, crepe 50) 100, sulfur 2.5, zinc oxide 8, reaction product of mercaptobenzothiazole with - "diethylamine 1, ceresin 1, phenyl-ß-naphthylamine 1,2, Alumina gel 40, when 6.5 parts of triethanolamine salt of alkylbenzenesulfonic acid are added, gives vulcanizates with the following properties Tear- Break- Tear- Elastic- Hardness- strength elongation strength strength ghore - kg / cm2 0% kg / cm 252 I 685 I 51 I 58 I 47 The above mixture gives Vull @ anisates with the following properties without the addition of the triethanolamine salt of the alkylbenzenesulfonic acid 211 1 616 1 ig 1 55 1 44 Example s An approach consisting of natural rubber (smoked sheets 5o, crepe 5o) - 100, sulfur 2.5, zinc oxide 8, reaction product of mercaptobenzothiazole with diethylamine x, ceresin i, phenyl-ß-naphthylamine 1,2, alumina gel 40, gives with the addition of 6.5 parts of the dimethylaniline salt of the alkylbenzenesulfonic acid vulcanizates with the following properties: Tear, break, tear, elastic hardness Strength elongation Strength city ghore kg / cm2 0% kg / cm ° / o 22z I 687 I 43.5 I 53 I 44 Without the addition of the dimethylaniline salt of the alkylbenzenesulfonic acid, the above mixture gives vulcanizates with the following properties: 211 I 616 I ig I 55 I 44

Claims (2)

ATENT CLAIMS: i. Method of improving physical Properties, especially the tear strength and tear resistance of rubber compounds made of natural rubber, synthetic rubber, reclaimed rubber or their Mixtures, characterized in that the rubber mixtures, preferably those that contain white or light-colored fillers or those mixed with carbon black, Amine salts of sulfonic acids, alkyl sulfuric acid esters - or mixtures of these, optionally with the addition of other dispersants or rubber auxiliaries, such as plasticizers, volatilization accelerators, among optionally adding small amounts of water on the roller or in the kneader. 2. The method according to claim i, characterized in that the amine salts are in the form their aqueous solutions are used.