SU788699A1 - Rubber modifying agent and method of obtaining same - Google Patents

Abstract

t. Modifier for rubber, based on 4-nitrosodifeshamine 5, differing from the fact that, in order to eliminate the danger of explosion when obtaining and using modifier 5: as well as simultaneously maintaining a high level of physical and mechanical properties of rubber, the modifier additionally contains fatty acid containing carbon atoms in the following ratios: components, wt.%; 4 Nitroazodiphenylamine 70-93 Fatty acid 7-30 2, Method for preparing a modifier according to claim 1, characterized in that the crude acid or its salt is mixed with an alkali metal salt of 4-nitrosodiphenylamine followed by processing the resulting mixture with a solution of mineral acid.

Description

The invention relates to the rubber industry 5, in particular, to a modifier for rubber and a method for its preparation.

Known modifier-for rubber. On the basis of 4-n1-1trosodifilnaya M1sha L However, this modifier is explosive.

The purpose of the invention is to eliminate the explosion in the preparation and use of the modifier while maintaining a high level of physical and mechanical properties of rubber.

This goal is achieved by the fact that the modifier for rubbers based on 4-nitrosodiphenylamino dopyl 1t-tsl 1o contains a fatty acid with carbon dioxide content in the following ratio of com-1onents, wt.%: 4-nitrosodiphenylamine 70-93, fatty acid 7-30. The method of obtaining the modifier consists in mixing the acid or its salt with the alkali metal salt of 4-nitrosodiphenylamine, followed by treatment of the mixture of minerals and mineral acid.

Example 1. In a 1.5 l flask equipped with a thermometer and a stirrer, 1 l of the alkali solution of 4-nitrosodiphenyl sodium salt is charged at a concentration of 186 g / l, calculated on the dry 4-nitrosodiphenyl-1n and heated with stirring up to 65-75 ° C. 14 g of molten stearin is added to the heated solution and the homogeneous solution is measured at a level of ~ 10 ° C. Acidic solution is added to the mixture with sodium salts of 4-nitrosodiphenylamine and stearin with vigorous stirring until the pH of the medium is lowered from 12-14 to 4. Then the mass is stirred to room temperature with agitation, filtered, the precipitate is washed from mineral salts, squeezed to 20 -40% “Paste is molded into cylindrical granules, which are dried at a temperature of 80-100 ° C with a residual moisture content not exceeding t%. Get 200 g insensitive to the mechanical impulse of the granules of the following composition, wt.%:

Stearin 7.0

4-Nitrozodifenshenmin93, 0

Yield 100% in terms of stearin and with the used sodium salt of 4-nit15odiphenylamine.

Example 2. Under the conditions of example 1, 79.9 g of a technical mixture of synthetic fatty acids (Cf-Cy} and acidified with 15% acid to pH 4 are added to 1 l of sodium 4x nitrosodiphenylash solution. 0 Get 25, 7 granules of the following composition in wt.%:

Shock acids

()thirty

4-Nitrosodiphenle5, 70.

The yield is 100% in terms of synergy of common acids and sodium salt of 4-nitrosodifeshamine.

Example 3. Under conditions of Example 1, 50.1 g of sodium stearin and 30% hydrochloric acid are added to a pH of 4 in a liter of sodium salt solution of 4-nitrosodol 11 ml of sodium salt and acidified to pH 4. 232.5 g of dry granules are obtained. composition, wt.%:

Stearin20

4-Nitro3odiphenylamine80

Yield 100% based on the amount of (sodium stearate and sodium salt of 4-nitrosulfonyl rubber).

Example 4. The 11th modifier, under the conditions of examples 1-3, is tested for impact sensitivity on an F-44-P instrument up to GOST 4545-48 with a load of 10 kg and a fall height of 250 mm. For comparison, an individual 4-nitroso-diphenylamine and a composition containing 95% 4-nitrosodiphenyl 1a and 5% stearin are tested. The test results are shown in Table. one.

As can be seen from the table, the introduction of x-acid in 4-nitrosodiphenylamine in the amount of 7-30 wt.% Eliminates its explosiveness.

Example 5. In this example, the effectiveness of the proposed modifier is shown in comparison with the individual 4-nitrosodiphenylamine.

Rubber compounds are prepared on the basis of SKI-3 rubber and with a plasticity of 5 0.38-0.40 in accordance with the following recipe,

ma.ch .: rubber 100, sulfur 2.5; Santokyur Mor 0.8, thiazole 2 MBS 0.1; zinc oxide 5. rubrax 2, rosin

3

1J N-nitrosodiphenylamine 0.5, white carbon black BS-120 5; modifier RU 1,2; neozone D 1, diafen OP 1; technical carbon PM-50 30; technical carbon PU-100 15; the proposed modifier of 0.3 (in terms of 4-nitrosodiphenylamine). The mixture is prepared at a temperature of 120-130 ° C. Plates, 2 mm thick, will be vulcanized in a press at temperature. Properties of rubber compounds and rubber are shown in Table. 2,

As can be seen from the table, 2. the plastic properties of rubber compounds and the mechanical properties of rubbers obtained with the proposed modifier s are on the same level as the properties of mixtures and rubbers, by the properties of modifiers

886994

irradiated with individual 4-nitrosodiphenylamine. Rubber obtained with the proposed modifier, i-. There are somewhat smaller scatter of the basic mechanical parameters.

The application of this invention allows to obtain a modifier for rubbers and rubbers, which is intrinsically safe both during its preparation and in the process of its preparation.

10 and when used as directed. The modifier obtained is insensitive to impact, low in toxicity, and is a non-adherent non-flaky granule, which allows

t5 apply it in a) scale and use automatic weighing and dosing systems for injection into rubber compounds.

Table 1

A-Nitrosodiphenylamine - 100 Stearin- 5

4-Nitrosodiphenylamine - Else Stearin- 7

4-NitrS13odiphenylamine - the Rest

FFA (Su-Cg) - 30 4-1-1 nitrosodiphenylamine - the Rest

Stearin- 20 4-Nitrosodiphenylamine - Else

12

Explosive

4-8

Also

Explosion proof

Also

Properties of rubber compounds and rubber ones

Properties of mixtures Carrera elasticity. II Viscosity, 100 ° C

Resistance by Dulcanization, +10 min

Cohesive strength, kgf Rubber properties

Stress at 300% elongation, kgf / cm, 20 ° C

Burst resistance, cts / sy, 20 ° С

Relative lengthening; at break,% 20 С

Tear resistance, kgf / cm, 20 ° С

Standard deviation in x 3%

:

Stress at 300% elongation

By resistance to tear By resistance to tear

table 2

O-, 43

0.43

0.43 43.5

45.555

15 4.5

. 17 5.2

17 5.0

156

155

155

268

272

515

500

80

78

1.18 1.54

4.5 3.28 2.54 5.011, 5 6.85 6.6

Claims (2)

1. A modifier for rubbers based on 4-nitrosodiphenylamine, characterized in that ₅ in order to eliminate the danger of explosion upon receipt and use of the modifier: and at the same time maintain a high level of physicomechanical properties of rubbers, the modifier additionally contains fatty acid containing carbon atoms C ₇ -C _2G in the following ratio of components, wt.%: 4-nitroazodiphenylamine 70-93 Fatty acid 7-30 2. The method of producing the modifier according to claim 1, characterized in that the fatty acid or its salt is mixed with the alkali metal salt of 4-nitrosodiphenylamine, followed by treatment of the resulting mixture with a mineral acid solution.