SU529185A1 - Polymer composition - Google Patents

Description

Anti-staples are introduced into the composition in the amount of 1-2 wt. hours per 100 weight. rubber h. In the preparation of these compounds, cheap raw materials 3 (5) -methylpyrazole, hexamethylenix are used, the product yield is 70-80%. Derivatives of 3 {5) -methylpyrazole are oily high-boiling liquids that are lightweight.

To increase the dynamic resistance of gum in the atmosphere, 3 (5) -methyl pyrazole derivatives can be used in a mixture with NG-2246 in a 1: 1 ratio.

Example 1. A rubber compound of the following composition is prepared.

Composition, all hours

100

thirty

3

12

acid

0.6 40

3 2

spruce

As antioxidants use NG-2246, TBTM, Ozonin-16, Ozonon51 and the mixtures of the last three with NG-2246 in a 1: 1 ratio, the mixture is rolled and preoCJTOT.

Testing of the obtained rubber samples for accelerated ozone aging is carried out in the ozone chamber at an ozone concentration

, five

The test results are shown in table 1,

Note: D is the amount of static strain, TC is the time until cracking occurs, Tp is the time until the specimen is destroyed. The table shows that the introduction to the rubber mixture as antioxidants 60

a b l and Ozonina -16 and Ozonina - 51 brings the ozone resistance of rubber to the level of TBTM.

Example 2. A rubber mixture of the following composition is prepared in the usual way.

Components of the mixtureComposition, weight. h

Natural rubber

Light coloured

Zinc Oxide30

Magnesia 3

Stearin1

Sulfur From the table it can be seen that the ozone resistance of rubber using Ozonins-16 and-51 as antioxidants increases 1.5-2 times as compared with rubber containing NG-2246 and approaches the level achieved by TBTM, especially in a mixture with NG-22 2246, Example 3. Preparing the composition shown in example 2, rubber samples

Tiuram0,4

Mel40

Antioxidant1

Antioxidants are the same as in example 1. Samples of rubber are subjected to accelerated ozone aging in ozone

OM S meter - 1 at ozone concentration

31 ID / o,

The test results are shown in Table 2.

Table 2 is pre-aged in water and in an air thermostat, and then tested in an OM 5-1 ozone chamber with an ozone concentration of 8-10%. The test characterizes the ability of additives to be combined with rubber, which is very important in conditions of atmospheric aging. The test results are shown in table 3.

403030

ator

604040

18012О120

18O150120

180180120 Note:

From the table it is clear that Ozonins - 16 and zo - 51, to a lesser extent than TBTM, are washed out of the rubber with water and evaporate upon thermostating. This leads to good weather resistance of the proposed composition.

Example 4. Preparing a composition Sf given in Example 2, dosage only

529185

8 Table 3.

The antioxidant is 2 weight, h, C > rubber samples are tested in the atmosphere in static and dynamic deformations. After aging, the residual strength of the rubber is determined. The test results are shown in Table. four.

Table 4 H-normal conditions; room temperature; B - Feeding in water for 10 days at room temperature; L - soaking in an air thermostat at 100 ° C for 24 hours.

The table shows that the proposed compositions have good weather resistance, especially when used as an antioxidant ozonin-16 and -51 mixed with NG-2246. Samples after atmospheric aging have a white color, in contrast to rubbers with the use of NG- 2 2 46 as antioxidant, which are painted in a light beige color.

Claims (2)

1. Handbook of rubberman, M., Himi, 1971, p. 342. 2. Handbook of rubberman, M., Himi, 1971, p. 350 (prototype).