Methyl vinyl ether, structural formula CH3OCH=CH2, also known as vinyl methyl ether. Colorless flammable gas. The boiling point is 5.5 ° C, the melting point is -122 ° C, and the flash point is -56 ° C. Slightly soluble in water, soluble in ethanol, ether and acetone. It is easily hydrolyzed to methanol and acetaldehyde under acidic conditions: it can be reacted with methanol under the catalysis of trace hydrogen chloride to form diethanol acetal; and hydrogen chloride and hydrogen sulphur can undergo intense addition reaction. It is highly polymerizable and can be polymerized by itself. It can also form copolymers with maleic acid, vinyl acetate vinegar and acrylonitrile. It can be condensed with phenol to form a resin and can be prepared by addition of acetylene and methanol under the catalysis of potassium methoxide. It is mainly used as a monomer for polymers, and its copolymer is used to prepare coatings, plasticizers and modifiers for polystyrene resins.
Methyl vinyl ether is a flammable colorless gas having an unpleasant odor at normal temperature and pressure. It is chemically active and sensitive to acids and acids. It is unstable, and its liquid phase or gas phase is easily polymerized. Therefore, a polymerization inhibitor (triethanolamine, dioctylamine, etc.) is usually added to the bottle to prevent polymerization. It forms an explosive mixture with air. Slightly soluble in water. It is easily liquefied and has a S.P. of 174 kPa at 20 °C. Toxicity: Methyl vinyl ether is an anesthetic substance, but its anesthetic properties are much smaller than ether (about 1/4 of ether). Exposure to methyl vinyl ether at a concentration of 5 to 20% may cause symptoms such as blurred vision, headache, numbness, dizziness, loss of sensation, and loss of consciousness. See methyl ether. Safety protection: Methyl vinyl ether is non-corrosive and can be used with common metal materials, but copper and its alloys are not available because there may be acetylene impurities in the ether. Polytetrafluoroethylene, polychlorotrifluoroethylene, fluorinated rubber and butyl rubber can be used. Chemical dry powder, foam, carbon dioxide and sand can be used for fire fighting.