Low-temperature-resistant elastomer rubber composition and application thereof

Abstract

The invention discloses a low-temperature-resistant elastomer rubber composition for natural gas pipelines, and belongs to the technical field of rubber materials. According to thelow-temperature-resistant elastomer rubber composition for natural gas pipelines, disclosed by the invention, the mixed polyurethane rubber and the nitrile rubber with specific contents are matched, the low-temperature performance of component materials is utilized, a plasticizer is not added, so that the air tightness loss caused by the use of a plasticizer in a traditional process is avoided. The product has excellent air tightness, natural gas resistance, low temperature resistance and long-term aging resistance, can still provide enough sealing force in the environment of -50 DEG C, and can bear the pressure of 18MPa. The material has enough fatigue life and meets the requirement of long-term work in a natural gas pipeline. The invention further provides a low-temperature-resistant sealing ring for natural gas pipelines, which is prepared from the low-temperature-resistant elastomer rubber composition for natural gas pipelines.

Description

technical field [0001] The invention relates to the technical field of rubber materials, in particular to a low temperature resistant elastomer rubber composition and its application. Background technique [0002] ISO-16010:2005 "Elastomeric seals-Material requirement for seals inpipes and fittings carrying gaseous fuels and hydrocarbon fluid" and, GB / T23568-2009 "Elastomeric seals-Material requirement for seals inpipes and fittings carrying gaseous fuels and hydrocarbon fluid" "Material Requirements" standard stipulates the requirements for the sealing ring elastomer materials on the delivery pipes and fittings, auxiliary equipment and valves in the prior art. According to the above standards, the operating temperature of elastomer materials is usually -5°C to +50°C, and in special cases it can reach -15°C to +50°C. The transportation medium includes G-type series of gaseous fuels (artificial gas, natural gas and LPG), hydrocarbon liquids (aromatic content within 30% by vo...

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Problems solved by technology

[0004] Of course, on the other hand, in terms of air tightness, according to the air permeability coefficients of air, carbon dioxide and nitrogen at 60°C given in "LANXESS world of rubber", the air permeability coefficient of nitrile-40 is roughly similar to that of butyl rubber. , while the air permeability coefficient of nitrile-18 is 7 times larger. In order to improve the low temperature resistance of nitrile rubber in engineering, it is usually necessary to add 30 parts of low-temperature plasticizers. The addition of these plasticizers will further enlarge the air permeability of elastomer materials. Coefficient, so the airtightness of nitrile rubber with low acrylonitrile content cannot meet the requirements of natural gas pipelines

Other common low-temperature-resistant rubbers such as NR, BR and Q cannot meet the actual engineering needs due to factors such as poor airtightness and large swelling in hydrocarbon liquids.

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