The rubber mixture based on acrylate rubber

 

The invention relates to the production of rubber mixtures based on acrylate rubbers used for the manufacture of technical rubber products, operating at temperatures up to 150oC. the Rubber mixture comprises 100 wt.h. acrylate rubber, 2-10 wt. H. curing agent is a blocked diamine, of the formula (1), 25-100 wt.h. mineral filler, 1-3 wt.h. antiadhesive. The rubber mixture can additionally contain not more than 4 wt. including vulcanizing agent is a Quaternary ammonium base, or not more than 80 wt.h. technical carbon, or not more than 20 wt.h. plasticizer, or not more than 4 wt.h. the antioxidant. Rubber compound using as the curing agent is a blocked diamine, of the formula [H2N-R1- R - R2- NH2]MCl, where R1,2- cyclic or aromatic hydrocarbon radicals; R is an aliphatic hydrocarbon radical; M is alkali metals has increased stability technological properties of mixtures and vulcanizates during storage. 4 C.p. f-crystals, 2 tab.

The invention relates to the production of rubber mixtures based on acrylate rubbers used for the manufacture of rubber products, F. acrylic acid with various vinyl monomers, widely used for the manufacture of rubber used in the form of various gaskets, seals, belts, heat-shielding coatings, due to its high resistance to oxidation at povyshennyh temperatures and sunlight and ozone. [1] [Belozerov And. Century Technology rubber Feet: Chemistry, 1979].

It is known that to obtain resins with good physico-mechanical properties using a variety of fillers including carbon black and mineral fillers, plasticizers, antioxidants and curing agents. As the last of the most widely used of Triethylenetetramine, Tetraethylenepentamine, triethyltetramine, hexamethylenediamine were, hexamethylenediisocyanate or acetate. Triethylenetetramine and triethyltetramine often used in combination with sulfur, while sulfur is an inhibitor of oxidative processes. [2] [encyclopedia of polymers: B. A. Kargin. M: Soviet encyclopedia, 1972].

Known rubber compound [3] [Ah.with. 436835, M CL 08 f 37/00, 1972] on the basis of acrylate rubbers, including vulcanizing group, salts of amines or alkali metal unsaturated or saturated carboxylic acid in the amount of 2-20 wt.h. and sulfur in an amount of 0.1 to 1.0 wt.h., the filler, in katastralgemeinden, also performing the role of a vulcanizing agent due to the presence of highly active functional groups capable at low temperatures to interact with the functional groups of the rubber, to obtain quickly vulcanizate and with good technological properties of mixtures and vulcanizates based on acrylate rubber.

However, the use of highly active vulcanizing groups in the mixture leads to increase in viscosity and thus reduce uprugoopticheskii properties of vulcanizates during storage of rubber compounds.

The claimed invention is directed to improving the stability of the technological properties of mixtures and vulcanizates during storage and processing.

To achieve the objectives proposed a rubber mixture based on acrylate rubbers, including vulcanizing agents, mineral fillers, carbon black, parting agent, antioxidant, plasticizer in the following ratios, wt.h.: Acrylate rubber is 100 Curing agent is a blocked diamine - 2-10 Vulcanizing agent (Quaternary ammonium base) - Not more than 4 Mineral filler - 25-100 carbon black is Not more than 80 parting agent - 1-3
Antioxida the following brands: Well Temp 4053EP company ZEON Chemicals, Europran AR 156 LTR firm Enichem, Kraynak (Canada), extait (Japan) and others.

Rubber-based acrylate rubbers are resistant to weathering, ozone, oxidation, light, multiple deformation, gas-tight, have good adhesive properties, oil-, petrol-resistant, wear-resistant.

As mineral fillers can be used: chalk, talc, kaolin, silicon dioxide, titanium and zinc white.

In order to enhance the rubber mixtures can be used the following brands of active fillers include carbon black P-324 P-514, the T-900. [4] [Majlis F. A., Fedyukin D. L. Terminological reference tires. M.: Chemistry, 1989].

A distinctive feature of the proposed rubber compound is used as the primary curing agent is a blocked diamine, which is a compound of the following formula:
[H2N-r]-R1-R2-NH2]MCl,
where R1,2- cyclic or aromatic hydrocarbon radicals;
R is an aliphatic hydrocarbon radical;
M is alkali metals.

You can use the following blocked diamines is a complex of 4,4'-diaminodiphenylmethane with sodium chloride, a complex of 4,4'-diaminodiphenylamine rubber mixtures is carried out in the mill Sm 2130 660/660 with serial input components. In the manufacture of mixtures should be avoided prior softening acrylate rubber, the addition of fillers is carried out immediately after the dissolution of the rubber. The total time of mixing and homogenization is from 35 to 40 minutes. You can use other traditional methods of mixing.

The invention is illustrated by examples 1-6, the compositions presented in table 1. The change of viscosity and strength properties of mixtures based on acrylate rubber during storage are shown in table 2.

Physico-mechanical properties were determined according to GOST 270-75, GOST 263-93 on standard samples, vulcanizing in the optimum vulcanization 175o25 minutes followed by temperature control for 4 hours at a temperature of 177oC.

We offer rubber compound using as a curing agent blocked diamine has a high stability of the technological properties of mixtures and vulcanizates during storage.

The rubber mixture based on acrylate rubber is used in the manufacture of automobile parts, seals, bag products at elevated temperatures in contact with sulfur-containing oils and solvents.

Istochnikovedcheskoe encyclopedia, 1972.

3. A. C. 436835, M CL 08 f 37/00, 1972 (prototype).

4. Majlis F. A., Fedyukin D. L. Terminological reference tires. M.: Chemistry, 1989.


Claims

1. The rubber mixture based on acrylate rubber containing vulcanizing agent, characterized in that as the vulcanizing agent, it contains a blocked diamine, which is a compound of the following formula:

[H2N-R1-R-R2-NH2]MCl,

where R1,2- cyclic or aromatic hydrocarbon radicals;

R is an aliphatic hydrocarbon radical

M is alkali metals,

further comprises a mineral filler and a parting agent, in the following ratio, wt.h.:

Acrylate rubber 100

Curing agent-

blocked diamine 2-10

Mineral filler 25-100

Parting agent 1-3

2. The mixture under item 1, characterized in that it further comprises a vulcanizing agent, a Quaternary ammonium base in an amount of not more than 4 wt.h.

3. The mixture under item 1, characterized in that it further contains carbon black is not more than 80 wt.h.

4. The mixture under item 1, characterized in that it further comprises plastie 4 wt.h.

 

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