SU412203A1 - METHOD OF PROTECTING CARBON-TREATED RUBBERS AND RUBBER ON THEIR BASIS1 The invention relates to methods for protecting chain-chain rubbers and their rubbers against ionizing radiation. A method of protecting rubbers and rubbers based on them by introducing phenyl-i-is a protective additive to them is known. does not allow sufficiently effective protection of rubbers and rubbers on their masses from the action of ionizing radiation. In order to increase the effectiveness of the protection of rubbers and rubbers based on them from the action of ionizing radiation A protective additive to use a compound of the formula where G is the radiation-chemical yield of the processes of descaling, destruction or taking into account the course of both processes. Example 1. In a solution of rubber SKP-26, purified by re-precipitation twice, enter 10 in an amount of 3 wt. hours per 100 weight. rubber h. From a solution of rubber with an additive get films - 50 microns. The film is irradiated at the source Co '^' ^ in vacuum (10 "" mm Hg) and in the atmosphere O-2. The received dose is 100 Mrad. Example 2. The film is prepared as in example 1, using 15b as a protective additive. from 0.2 to 10 parts by weight of rubber. When these protective additives are introduced into rubber, the protection factor of rubber is significantly increased from 48% with the introduction of phenyl-p-naphtylamine to 85% with the introduction of these additives at 100 Mrad absorbed dose, the protection factor is calculated according to the formula P ^ lOOfl- ^^^ "^ \ L'oea ext2025. Irradiation was performed in a vacuum and O2. The results are shown in Table. 1. And p and Mer 3. Films obtained using the method 30 bu 1 were used as a control, and - Google Patents

Description

Table 1 Comparative data on the irradiation of rubbers in vacuum in the presence of proposed and known additives Table 2 Comparative data on the irradiation of rubber in O2 in the presence of proposed and known additives, consisting of the following components (in weight parts): SKN-26 Tyuram ZnO lamp soot sulfur XV-NK From a mixture of prepared plates with a thickness of 1 mm and tube mm and h - 8 mm. Irradiated at the source Co ™. The data are given in table. 3. Example 5. Preparing a rubber mixture based on SKN-26 in example 4. As a protective additive was injected 3.0 weight. h

phenyl-p-naphthylamine, irradiation was carried out in vacuum and 02. The test results are shown in Table. 1 and 2.

As can be seen from the table. 1, under vacuum in the presence of the proposed additive, the number of crosslinks at the same absorbed dose is reduced by 4 times, the protection ratio increases from 48 to 85%.

Example 4. Based on SCM-26 (not containing antioxidant), rubber was prepared. Example 6. The rubber used was prepared and tested as Example 5, and phenyl-p-naphthylamine, 4010, 4010NA, was used as a protective additive. weight. h. The results are shown in Table. 3. Determine the change in the relative elongation with the dose and the accumulation of residual deformation on the traffic jams.

Table 3

Corks with additives were destroyed, i.e. more than 85%, after 380 Mrad.

From the data table. 3 shows that the additives significantly more effectively protect the rubber from ionizing radiation than the known additives.

Subject invention

The way to protect carbartic rubbers and rubbers based on them from the action of ionizing

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radiation by introducing a protective additive in them, characterized in that, in order to increase the effectiveness of protection, a compound of the general formula is used as a protective additive.

where XS-, -S-S-, in the amount of

ten

from

0.2 to 10 weight. hours per 100 weight. rubber h.