SU519444A1 - Rubber compound - Google Patents

Description

(54) RUBBER MIXTURE

The invention relates to the rubber industry. A rubber chain based on chain-chain rubber, containing a protective additive against the action of ionizing radiation, such as polyphenothiazine, is known. However, this additive does not provide an adequate level of resistance of the rubber mixture and rubber from it to the action of ionizing radiation. In order to eliminate this lack of a compound of the general formula tH -C: R -Cl-NH -R3, .m-, where 2-10; m 2-10: whether the General formula C (where p 2-10; RI and Rj. in the amount of 1.5-2, About weight. h per 100 weight, h, rubber. Use as an additive compounds of General formula 11 Example 1 The copolymer of diphenylamine with anthracene (mol, weight 1000, t, mp, 120 ° C) in an amount of 2 parts by weight per 100 parts by weight of rubber was introduced into a solution of butadiene nitrile rubber (SKN-26), purified by double reprecipitation. A 50 μm film is obtained from the rubber solution with the additive, the film is irradiated at the Co source, a vacuum of 10 mm Hg, Art., Temperature 25 C. The test results are shown in Table 1, Example 2. The rubber film is prepared Example 1; in this case 2 weight, h, diphenylamine copolymer with irradiation is carried out at the source with anthracene, 10 mm Hg, degree, temperature, vacuum, 2 5 s, the test results are given in Table 1, Example 3 , On the basis of SKN-26 rubber, a rubber mixture of the composition (wt. H) is prepared: C1Sh-2610O, 0 Tiuram1.5 1pO5.0 Soot lampov 32.0 Sulfur0.5 Diphenylamine / anthracene copolymer2,0 They were irradiated in air in a static compressed state. Comparative test results are given in Table 2 Example 4. Rubber and rubber films prepared according to the methods described in examples 1 and 3 are used as controls (known), but previously known ones, such as polyphenothiazine, are used as a protective additive. As in the data in Table 1, the proposed protective additive is three times more effective in protecting rubber from crushing than the previously known additive polyphenothiazine. For example, the radionuclide-chemical crosslinking yield (&) decreases to 0.4 in the presence of a diphenylamine copolymer with anthradenome, whereas in the presence of polyphenocase, it is equal to 1.2. In addition, rubbers and rubbers retain their original properties 2-4 times longer in the presence of the proposed additive compared to the known, the structure formation rate decreases by a factor of 5 to 5 the speed n decreases days, and the rate of accumulation of a non-residual deformation (see Table 2). The proposed additive effectively protects rubber and rubber under high vacuum conditions (10 mm Hg, Art.), Use as an additive of the general formula (11). Example 5, Polycnitrosodiphenylamine in quantities of 2 wt. H, per 1OO weight, including rubber, is introduced into the solution of rubber SK 26, purified by double reprecipitation. Polynit zodiphenylamine is an oligomeric product of thermal transformation of tl-nitrosodiphenylamine, mol. weight 900, so pl. 120 C, From a solution of rubber get a film thickness of 50 microns. The film is irradiated at a vacuum source of 10 mm Hg, st „temperature 25 ° C, the results are shown in table. 3, 6, Rubber film, SODE1 Example, polynitrosodiphenylamine. A weight of 2, h, is prepared according to Example 5; Radiation is applied at a source of Coi vacuum of 10 mm Hg. Art. and a temperature of 25 ° C. The test results are given in Table 4. Example 7 Pollennitrosophenylnaphthipamine in an amount of 2 parts by weight is introduced into the SKN-26 rubber solution, purified by re-precipitation twice. on 10 O weight. rubber Polynitrosophenyl - naphthylamine-oligomer thermal conversion product I - nitrosophenyl. 3-naphthylamine, notch weight 120 O, t, pl. 150 C, From the solution: rubber get a film thickness of 50 microns. The film is irradiated with HCiO4HHKe Co; vacuum 10 mm Hg, st, temperature 25 C, The test results are presented in Table. Sv Example 8o A rubber film was prepared in accordance with Example 7; Vacuum is applied to 10 mm Hg. The values are reported at the Co source at 25 ° C. The results of the tests are given in Table. 4. Example 9e On the basis of SKN-26 rubber, a rubber mixture containing (weight ,, h) :; CU1-26100.0 Thiuram1.5 1pO5.0 Soot lampo 32.0 Sulfur, V Polynitrosodiphenylamine 2.0 The products are irradiated in air, compressed with static composites, Sprav, and the results are shown in Table 5. Example 10, The rubber mixture was prepared in accordance with Example 9, and 3 wt. Was used as a protective additive instead of iolikytrozbdiphenylamine. h, isl / zhitrozofenil - -naf Tylamine. PRI me R 11. As a control, rubber and rubber films prepared according to the methods described in examples 5 and 9 are used. Polyphenothiain is used as an additive. As can be seen from i.HSKSi table. 4, the proposed protective additives are twice as effective in detecting rubbers from radiation at a vacuum of 10 mm or less than the known ones. So, at a dose of 100 mrad in prch ::: the effect of polyphenothiazine, the radiation – chemical yield of crosslinking is Ij3, and the presence of polynitrosodiphenylamine in the presence of polynitrosodiphenylamine is 0.6 (see Table 3). Rubber products with the proposed additive retain high} 1o elasticity to the dose ZOO mrad, and with a known additive only to a dose of 210 mrad (cm, taol, 5),

Infused proposed and known protective additives for stitching SKN-26 when irradiated in vacuum (1O mm Hg, Art.) At room temperature

Note: When SKN-26 is irradiated without a protective additive at a dose of 80 mrad, the number of cross-links is 50, the radiation-chemical yield of cross-linking is 10.

Table 1

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Claims (1)

15 Formula of the Invention Rubber mixture based on chain-chain rubber containing a protective additive against the action of ionizing radiation, which, in order to increase the stability of the rubber mixture and vulcanizates from it to the action of ionizing radiation, the rubber mixture as an additive contains a compound formulas I - (K) -CRj-NH-Rj,) -, 5, uKV or the general formula L - () Rj where P 2-10; where P 2-10; m 2-10; R: or R, uRj: in the amount of 1.5 - 2 weight. hours to 10 O weight. rubber