RU2304596C2 - Vulcanizable rubber mixture on the basis of the hydrogenated butadiene-nitrile caoutchouck - Google Patents

Abstract

FIELD: rubber industry; production of the vulcanizable rubber mixture on the basis of the hydrogenated butadiene-nitrile caoutchouck.

SUBSTANCE: the invention is pertaining to production of the vulcanizable rubber mixture on the basis of the hydrogenated butadiene-nitrile caoutchouck used for manufacture of rubber-technical products efficient at the temperatures up to 150°C. The vulcanizable rubber mixture contains (in mass): the hydrogenated butadiene-nitrile caoutchouck - 70-95, the acrylate caoutchouck - 30-50, sulfur - 0.5-1.2, quaternary ammonium base - 2-6, sulfonamide Ц - 0.5-1.5, thiuram Д - 1-2, metallic stearate - 2-4, zinc oxide - 3-5, industrial carbon - 40-50, the stearic acid - 1-2, the antioxidant - 3.0-3.8. The technical result of the invention consists in reduction of the mixture viscosity, increase of the heat-resistance and the aggressive mediums-resistant properties with the simultaneous decrease of the residual compressive deformation.

EFFECT: the invention ensures the reduced mixture viscosity, the increased heat-resistant and the aggressive mediums-resistant properties at the simultaneously decreased of the residual compressive deformation.

3 cl, 2 tbl

Description

The invention can be used to produce a rubber mixture based on partially hydrogenated nitrile butadiene rubber and acrylate rubber used for the manufacture of rubber products operable at temperatures up to 150 ° C.

Vulcanizable rubber compounds based on partially hydrogenated nitrile butadiene rubber are characterized by high strength in the presence of ozone, oils of aromatic liquids and other aggressive environments. This allows the use of partially hydrogenated nitrile butadiene rubbers for the manufacture of seals operating in static and dynamic modes, including seals for oil drilling equipment, membranes, freon gaskets, O-rings, as well as various parts and technical products for automotive, petroleum, and electrical industries [1].

However, rubber compounds based on hydrogenated nitrile butadiene rubbers have a high viscosity, which complicates the process of processing the mixture, especially in the manufacture of products of complex configuration. Vulcanizates of hydrogenated nitrile butadiene rubber obtained using sulfur vulcanizing systems are characterized by a high accumulation of permanent compression deformation.

The closest in technical essence and the achieved effect to the proposed mixture is a rubber mixture [2] based on hydrogenated nitrile butadiene rubber, including sulfur in an amount of 0.8-1.2 parts by weight, zinc white in an amount of 3.0-6 5 parts by weight, stearic acid in an amount of 0.5-3.0 parts by weight, dibutyl sebacinate in an amount of 5.0-15.0 parts by weight Additionally, the rubber mixture contains naphtam-2 as a stabilizer in an amount of 0.8-1.2 parts by weight, and sulfenamide C in an amount of 1.0-3.0 parts by weight of N, N, N as an accelerating vulcanizing system. -dithiodimorpholine in an amount of 1.8-2.5 parts by weight, polyvinyl chloride in an amount of 5.0-20.0 parts by weight as modifying agents and acetonanil R in an amount of 1.8-3.0 parts by weight, as fillers - carbon black P 234 in an amount of 15.0-80.0 parts by weight and carbon black P 702 in the amount of 10.0-50.0 wt.h.

A disadvantage of the known rubber mixture based on hydrogenated nitrile butadiene rubber, which has improved characteristics of strength and elasticity, tear resistance and bond strength of rubber with metal while reducing residual compressive strain, is the high viscosity of rubber compounds, insufficient level of residual compressive strain, heat-resistant and aggressive properties.

The claimed invention is aimed at reducing the viscosity of the mixture in order to increase its technological properties during processing, increasing heat-resistant and aggressive-resistant properties while reducing residual compressive strain used for the manufacture of rubber products operating at elevated temperatures in aggressive environments.

To achieve this, a vulcanizable rubber mixture based on hydrogenated nitrile butadiene rubber is proposed, including acrylate rubber, vulcanizing agents, vulcanization activators, vulcanization accelerators, fillers, anti-adhesive, antioxidants, plasticizer in the following ratios of components, parts by weight:

hydrogenated nitrile butadiene rubber 70.0-95.0 acrylate rubber 30.0-5.0 sulfur 0.5-1.2 quaternary ammonium base 2.0-6.0 metal stearate 2.0-4.0 sulfenamide C 0.5-1.5 tiuram D 1.0-2.0 captax no more 0.5 zinc oxide 3.0-5.0 carbon black 40.0-50.0 plasticizer no more 10.0 release agent (stearic acid) 1.0-2.0 antioxidant 3.0-3.8

In the mixture proposed, partially hydrogenated nitrile butadiene rubbers of the following grades can be used: Terban from Vaueg, Polnzar from Tornak, Zeon from Zetpol from 1.0 to 5.5% residual double bonds and brands of acrylate rubbers: Well Temp 4053EP from ZEON Chemicals, Europen AR from Enichem, Krainak (Canada), Nipol AR from Nippon Zeon.

In order to strengthen the rubber compounds, the following brands of active and low activity fillers can be used: carbon black P-234, P-514, P-324.

Plasticizers, which are esters of various alcohols and dicarboxylic acids or adipates, are introduced into the rubber compound to improve processing and reduce the level of swelling in aggressive environments.

The following can be used as antioxidant: diafen FP (N-isopropyl-N-phenyl-p-phenylenediamine), naphtham-2 (phenyl-2-naphthylamine), acetonanil R (2,2,4-trimethyl-1,2-dihydroquinoline) .

Sodium stearate or potassium stearate may be used as metal stearate.

As vulcanization accelerators, sulfenamide C (N-cyclohexylbenzothiazolyl-2-sulfenamide), captax (2-mercaptobenzthiazole), thiuram D (tetramethylthiuram disulfide) can be used [3,4].

A distinctive feature of the proposed vulcanized rubber mixture based on hydrogenated nitrile butadiene rubber is the use of acrylate rubber, Quaternary ammonium base, metal stearate, thiuram D, Captax.

The process of mixing rubber compounds is carried out on rollers Cm 2130 660/660 with sequential input components. The total mixing and homogenization time is from 40 to 50 minutes. You can use other traditional methods of mixing.

The invention is illustrated by examples 1-11, the compositions of which are presented in table 1. Physico-mechanical properties of rubber compounds based on partially hydrogenated nitrile butadiene rubber are shown in table 2.

Physico-mechanical properties were determined according to GOST 270-75, GOST 263-93 on standard samples vulcanized at a vulcanization optimum of 151 ° C × 30 minutes.

The proposed vulcanizable rubber mixture based on hydrogenated nitrile butadiene rubber using acrylate rubber, a quaternary ammonium base, metal stearate, thiuram D, captax reduces the viscosity of the mixture in order to increase its processability, increase heat-resistant and aggressive-resistant properties, while reducing the residual compression deformation of the rubber mixture .

The rubber mixture based on partially hydrogenated nitrile butadiene rubber due to its low viscosity and relative residual compressive strain, good heat and aggressive resistance is used to produce seals of complex configuration operating in static and dynamic modes, membranes, as well as various rubber products for automotive, petroleum and electrical industries.

Information sources

1. Analytical overview information. Current status and development priorities of the global production of informal and molded rubber goods. TsNIITEneftekhim, M., 1999.

2. Patent UA 47511 C2, C08L 9/00 A.

3. Thematic review. Hydrogenated nitrile butadiene rubbers. Properties Recipe Engineering. Application. M., 1991.

4. Makhlis F.A., Fedyukin D.L. Terminological reference for rubber. M .: Chemistry, 1989.

Claims (3)

1. Vulcanizable rubber mixture based on hydrogenated nitrile butadiene rubber, including sulfur, sulfenamide C, zinc oxide, stearic acid, carbon black, an antioxidant, characterized in that it contains AF diafen and acetonanil R and additionally contains acrylate rubber, quaternary ammonium base, metal stearate, thiuram D, metal stearate in the following ratio of components, parts by weight: hydrogenated nitrile butadiene rubber 70.0-95.0 acrylate rubber 30.0-5.0 sulfur 0.5-1.2 quaternary ammonium base 2.0-6.0 sulfenamide C 0.5-1.5 tiuram D 1.0-2.0 metal stearate 2.0-4.0 zinc oxide 3.0-5.0 carbon black 40.0-50.0 stearic acid 1.0-2.0 antioxidant 3.0-3.8 2. The mixture according to claim 1, characterized in that it further contains captax in an amount of not more than 0.5 wt.h. 3. The mixture according to claim 1, characterized in that it further comprises a plasticizer in an amount of not more than 10.0 parts by weight