SU608818A1 - Butadiene-nitrile rubber-base compound - Google Patents

Description

one

The invention relates to the rubber industry, in particular, to the production of rubber compounds for the rubber industry, namely, mixtures containing, their nitrile rubber (SCN), carbon black, carbon black, vulcanizing group, and other targeted additives.

Known rubber mixture based on butadiene rubber, for example SKI-40, composition, weight. h .; SKN 100; sulfur 1.5; mercaptobenzthiazole 0.8; zinc white (zinc oxide) 5.0; technical stearin 1,5; technical carbon (salsa DG-100) 45 1.

The processing of this mixture is difficult because of its high rigidity, due to the large intermolecular interaction. Therefore, until recently, the manufacture of rubber mixtures from SKN has been carried out almost completely on rollers at a temperature of 30-40 ° C. Increasing the temperature of the rolls makes it difficult to mix: the rubber rvetse, the introduction of ingredients, especially carbon black, is complicated. In addition, rubber from a known mixture has low mechanical properties (tearing, bending, multiple stretching).

The purpose of the invention is to increase the plasticity of the mixture, improving its technological properties and the mechanical properties of rubber from it.

This is achieved by the fact that in the rubber mixture

additionally, polyetherimido-3-methyltetrahydrophthalate (PEA) and nolipinerylen are introduced in the following ratio of componeites, wt. including:

Butadiene nitrile rubber100

Sulfur 1,3-1,5

Vulcanization accelerator -

mercaptobenzthiazole 0.6-0.8

Zinc Oxide3.0-5.0

Stearin1,0-2,0

Soot40-50

PEA10-30

Polypiperylene 5-20

Example 1. Rubber mixture composition, weight. including:

SKN-40100

Sulfur 1.5

Mercaptobenzthiazole 0.8

Zinc White5.0

Stearin technical1,5

Carbon black (carbon black

DG-100) 45

PEA20

Polypiperylene 10

Polypiperylene 10 is made on laboratory rollers at a roll temperature of 60-70 ° C.

Order of the beginning of the introduction of components, min: SKN-40 0; stearin technical 5; mercptobenzthiazole 7; zinc white 10; 1/2 carbon black and polypiperylene 13; 1/2 carbon black and PEA 16; sulfur 20; cut 25.

The curing of the mixtures was carried out at a temperature of 143 ° C for 40 minutes.

Example 2. The composition of the rubber mixture and the mode of preparation are similar to the composition and mode of example 1 with a PEA content of 10 wt. hours, polypiperylene - 15 wt. h

Example 3. The composition of the rubber mixture and the mode of preparation are similar to the composition and mode of example 1 with a PEA content of 30 wt. hours, polypiperylene - 6 wt. h

The average test performance clastoelastic properties of rubber compounds and physico-mechanical indicators of their vulcanization are presented in Table. 1 and 2.

Table 1 Plasto-elastic properties of rubber compounds

Table 2 Mechanical properties of rubber

With the introduction of the PEA mixture, the roll well adhered to it; with the introduction of polypiperylene, the surface of the blanks became glossy and smoother compared to the surface of the known rubber compound.

In addition, experienced rubber compounds have higher ductility, less shrinkage and viscosity compared to the known mixture.

It can be seen from the above data that experienced rubbers have 6–10 times higher mechanical properties for fatigue endurance during repeated stretching, 10–15 times for multiple bending,

1.3-1.7 times - tear resistance.

The best combination of the plasto-elastic properties of the mixtures and the physicomechanical characteristics of the vulcanizates is achieved with the introduction of 10 wt. hours, polypiperylene, 20 wt. PEA

(example 1). The rubber mixture of this composition is well processed on the process equipment, and the vulcanizates have a high complex of physical and mechanical properties, which allows to improve the technological process.

processing mixtures and the quality of rubber products.

Claims (1)

1. Handbook of rubberman, M., “Himi, 1971, p. 608.