Protective rubber sleeve for low-temperature container junction valves

Abstract

The invention relates to the technical field of low-temperature materials, specifically to a protective rubber sleeve for low-temperature container junction valves. The material of the protective rubber sleeve comprises the following ingredients: butyl rubber, cold-resistant modified natural rubber, fluorinated silicone rubber, a chlorosulfonated polyethylene elastomer, hydroxypropyl methacrylate,carbon black, nano-zinc oxide, stearic acid, a vulcanizing agent, a promoter, a silane coupling agent and an anti-aging agent, wherein the vulcanizing agent used in the ingredients is sulphur; the promoter is one of a promoter TE, a promoter ZIP and a promoter NA-22; and the anti-aging agent is a mixture of an anti-aging agent AW and an anti-aging agent PPD mixed according to the mass ratio of 1:3. The protective rubber sleeve is prepared from a low temperature resistant rubber material. By a new formula for preparation of the low temperature resistant rubber, brittle transition temperature of the material is remarkably reduced.

Description

technical field [0001] The invention relates to the technical field of cryogenic materials, in particular to a protective rubber sleeve for a connecting valve of a cryogenic container. Background technique [0002] Cryogenic pressure vessel refers to a pressure vessel whose wall temperature is below -20°C during operation. Containers for storage and transportation of liquefied ethylene, liquefied natural gas, liquid nitrogen and liquid hydrogen are all low-pressure containers. The vast majority of pressure vessels are made of tailor-welded steel plates. During the manufacturing process, the steel plate is subject to cold and hot processing and welding, so the pressure vessel steel is required to have good process performance, and it is required to have a certain strength and sufficient toughness to withstand external loads under normal working conditions without brittle failure. Pressure vessel steel develops low alloy steel on the basis of carbon steel. The carbon conten...

AI Technical Summary

Problems solved by technology

However, the low temperature resistance of rubber materials is generally poor. Low temperature environment will cause embrittlement of rubber materials, reduce the elasticity, deformation recovery force and tensile strength of rubber materials, and make rubber materials easy to be brittle when subjected to external forces.

[0007] Patent application number 201511014652.1 discloses an outer layer rubber for hydraulic rubber hoses resistant to low temperature minus 55°C. The use of polyethylene rubber and other functional auxiliary materials improves the low temperature resistance of rubber materials, but the low temperature resistance of the main rubber material is still relatively poor, so the low temperature resistance of synthetic rubber materials is limited