FR2655992A1 - MIXING MASS FOR VULCANIZABLE RUBBER. - Google Patents

Abstract

The invention relates to a compound for vulcanizable rubber containing elastomers of natural rubber and / or synthetic polyisoprene and / or styrenebutadiene in solution or emulsion and / or polybutadiene; a filler, in particular active carbon black, processing aids in the form of plasticizers; and vulcanizing agents in an effective amount, in which there are present 1 to 50 parts per 100 parts of rubber on the one hand plasticizer in ester form and on the other hand liquid polymer, in particular from the polyisoprene group. Application to the manufacture of vulcanization products for vehicle tires.

Description

The present invention relates to rubber compounding compounds

  vulcanizable, containing elastomers, fillers, processing aids and vulcanizing agents. It is known to dilute by plasticizers used as processing aids the elastomers contained in the rubber mixture masses, such as natural rubber, synthetic polyisoprene,

  styrene-butadiene solution or emulsion, polybutary

diene or mixtures thereof.

  For the purpose of this procedure (German Patent No. 1079316), commercial products are preferably used in the form of a selective extract from petroleum refining.

having an aromatic character.

  These oils, known as aromatic oils, improve the plasticity of the rubber compound and thus the processability of the highly viscous components of the mixture. They reduce the hardness,

  modulus and elasticity of vulcanization products.

  Because of the aromatic oil, the product of vulgaris

  tion has the disadvantage of fading on the other objects or for example the surfaces with which it comes into contact. It forms on these surfaces points of contact ranging from brown to black more or less marked, as can be observed on tires in stock,

  conveyor belts and other similar objects.

  These dirty contact points are difficult or impossible

  to be eliminated and constitute a pollution of the environment

  to the extent that they are points of

oily soil.

  The objective of the invention is the preparation of N vulcanization products which do not fade and whose

  physical properties are not impaired by the plasmas

  employees when they are used to make tires,

  conveyor belts or others The object of the invention

  It consists of replacing the aromatic oil in its entirety with other suitable processing aids which are compatible with the elastomers used in each case and which have an influence on the processability of these elastomers as good as the aromatic oils used. until now, without

  their disadvantage of charging for the environment.

  In a mass of vulcanizing rubber mixture

  containing elastomers, such as natural rubber or synthetic polyisoprene,

  styrene-butadiene solution or emulsion, or poly-

  butadiene or mixtures thereof, also containing

  charges, in particular active blackjack, and

  additionally, treatment adjuvants and

  According to the invention, up to 50 parts, based on 100 parts of rubber, of plasticizer in the form of an ester and / or in the form of a naphthenic or paraffinic liquid polymer, in particular

polyisoprene group.

  The vulcanization products resulting from such a mixture for rubber do not have the disadvantage

  of the prior art and in particular do not deter-

do not hesitate.

  Both the esters, the naphthenic and paraffinic oils and the liquid polyisoprenes are compatible with the main component of the rubber, which may be natural rubber or another of the abovementioned elastomers, and exert a good dilution of

  the elastomer used in each case.

  We can also achieve the combination effect

  obtained with the aforementioned plasticizer and the composition

  liquid rubber using asphaltenes.

  Asphaltenes are non-pollutant additives for the environment and may be incorporated together with or instead of liquid isoprene in the rubber blend mass and give with the ester-based plasticizers, such as for example dioctyl phthalate, or naphthenic or paraffinic oil, well-diluted rubber mixtures which provide a non-polluting and non-polluting vulcanizing product and achieve a level of physical value profile obtained when uses

aromatic oils.

  More details and clarification are provided below in two examples of blends (A and B) diluted for rubber vulcanizable with sulfur, which are used as products

  vulcanising in tires for vehicles.

  Rubber mix A is composed of: diolite phthalate (PDO) 2.5 "zinc oxide 1.0" HFO "diolite phthalate (PDO)" polyurethane rubber styrene-butadiene rubber stearic acid 1.5 "anti-aging agent 1.0" wax, 0 "resin 0.3" DPG (diphenylguanidine) 0.1 "ZBEC (zinc dibenzyl dithiocarbamate) 0.6" of CBS (benzothiazyl-2-cyclohexylsulfonamide) 1.8 "sulfur

  The physical properties of this vulcanide product

  are for heating for 10 minutes at 170 ° C: Hardness (at ampering temperature) 63 Shore A Module 300% 10 M Pa Elongation at break 400% Tensile strength 14 M Pa Bounce elasticity 23% (at room temperature) Abrasion DIN 71 mm 2 (at amber temperature) Rubber compound B is composed of: dioctyl phthalate (PDO) "HAF 20" "liquid polyisoprene liquid" emulsion styrene-butadiene rubber " asphaltene 2.5 "zinc oxide 1.0" stearic acid 1.5 "anti-aging agent 1.0" wax 0.3 "DPG (diphenylguanidine) 1.3" CBS ( benzothiazyl-2-cyclohexylsulfonamide) 1.9 "sulfur

  The physical properties of this vulcanide product

  are for heating for 10 minutes at 170 C: Hardness (at room temperature) 64 Shore A Module 300% 11.5 M Pa Elongation at break 400% Tensile strength 14 M Pa Elasticity of rebound 23% (at temperature ambient) Abrasion DIN 95 mm 2 (room temperature)

Claims (4)

  1 Vulcanizable rubber compound mass, containing:   1.1 elastomers of natural rubber and / or poly-   synthetic isoprene and / or styrene-butadiene solution or emulsion and / or polybutadiene, 1.2 a filler, in particular active carbon black,   1.3 treatment adjuvants in the form of plastics   curing agents, in which there are present 1 to 50 parts per part of rubber 1.5 of plasticizer in the form of ester and 1.6 of liquid polymer, in particular of the group of polyisoprene.   2 Mixing material for vulcanizable rubber according to   claim 1, characterized by the fact that plastic   is present in the form of ester and / or oil naphthenic or paraffinic.   3 Mixing compound for vulcanizable rubber according to   one of claims 1 or 2, characterized in that   that asphaltenes are present at a rate of 1 to 100 parts of rubber instead liquid polymer.   4 Mixing material for vulcanizable rubber according to   one of claims 1 or 2, characterized in that   it comprises liquid polymers and asphaltenes, together in a proportion of up to 50 parts per 100 parts of rubber in all.