Outer rubber resistant to low temperature of minus 55 DEG C for hydraulic rubber hose

Abstract

The invention discloses outer rubber resistant to a low temperature of minus 55 DEG C for a hydraulic rubber hose. The outer rubber is prepared from the following raw materials in parts by weight: 35 to 45 parts of nitrile rubber with low acrylonitrile content, 35 to 45 parts of composite materials of nitrile rubber and polyvinyl chloride, 15 to 25 parts of chlorosulfonated polyethylene rubber, 4.9 to 7.1 parts of anti-aging agents, 3.8 to 5.2 parts of activating agents, 5 to 7 parts of light magnesium oxides, 3.5 to 4.5 parts of anti-ozone wax, 15 to 25 parts of reinforcing filling agents, 70 to 100 parts of reinforcing agents, 4.3 to 6.7 parts of adhesives, 15 to 25 parts of plasticizing agents dioctyl adipate (DOA), 1 to 2 parts of vulcanizing agents, and 1.3 to 2.3 parts of accelerating agents. A vulcanized rubber material is obvious in physical property, low temperature resistance and effect, and a gray hydraulic rubber pipe made from the above materials has the low temperature resistance which is up to minus 55 DEG C, and is intact in the conditions of 50ppm of ozone in 72 hours at a temperature of 40 DEG C.

Description

technical field [0001] The invention belongs to the technical field of application of polymer rubber materials, and in particular relates to an outer glue for a hydraulic rubber hose resistant to low temperature minus 55°C and a preparation method thereof. Background technique [0002] The hydraulic rubber hose is mainly composed of a hydraulic oil-resistant synthetic rubber inner layer, a middle rubber layer, a reinforcement layer, and a weather-resistant synthetic rubber outer layer. The inner rubber layer has the function of making the conveying medium withstand pressure and protecting the steel wire or wire fiber from erosion; the reinforcing layer is a skeleton material, which is used to ensure the pressure of the hose; the outer rubber layer plays the role of protecting the reinforcing layer. Since the outer rubber layer is in direct contact with the external environment, environmental factors will affect the aging of the outer rubber layer, such as ultraviolet rays, a...

AI Technical Summary

Problems solved by technology

The outer rubber layer of hydraulic rubber hose is generally made of nitrile rubber or its composite materials. The suitable temperature is generally between -40 ° C and 120 ° C. If the temperature is lower than this range or higher than this range, the hose will be shortened. service life

At present, the outer rubber layer of low-temperature-resistant hydraulic hoses is generally made of nitrile rubber with low acrylonitrile content through specific mixing and processing, but the heat resistance and ozone aging resistance of nitrile rubber with low acrylonitrile content are very poor, although The low-temperature performance meets the requirements, but the heat resistance and ozone resistance of the hose often fail to meet the requirements. The outer rubber layer of the hose has not been used for a long time and cracks appear, which greatly affects the service life of the hose.

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