A method of inhibiting the polymerization of vinyl compounds

Abstract

A method for inhibiting the polymerization of vinyl compounds, comprising adding a polymerization inhibitor to a vinyl compound system, the components of which include component A and component B. Wherein A is one of piperidine oxygen free radicals, nitrophenol or benzoquinone, or a mixture of two or more; B is diethylene glycol monomethyl ether, diethylene glycol dimethyl ether or diethylene glycol monobutyl ether One, or a mixture of two or more; in parts by weight, A:B=1:(0.5~2.0). The polymerization inhibitor is first prepared into a solution with a solvent and then added to the vinyl compound system. The solvent is one of dimethylformamide, toluene or xylene, in parts by weight, (A+B): solvent=(2~ 8): 10. The addition amount of the polymerization inhibitor is 0.3-3.0wt.‰ based on the amount of component A based on the vinyl compound. The advantage of the invention is that it can reduce the consumption of solvent, and more importantly, it can obtain ideal polymerization inhibition effect by adding less polymerization inhibitor into the vinyl compound system.

Description

technical field [0001] The present invention relates to a method for inhibiting the polymerization of vinyl compounds, in particular to the method of adding components comprising piperidine oxygen free radicals, nitrophenol and / or benzoquinone to the vinyl compound system to inhibit the polymerization of vinyl compounds method. Background technique [0002] Vinyl compounds are mostly organic monomers with a wide range of uses and are raw materials for the manufacture of many organic materials. The more important vinyl compounds such as isopentene, isoprene, butadiene, styrene, acrylonitrile and (methyl) Acrylic acid and its esters, etc. The common feature of vinyl compounds is that they contain very active vinyl groups. During storage, transportation or processing, they are affected by various factors such as high temperature, peroxides, iron ions, etc., and are prone to chain free radical polymerization to form polymers. , which not only leads to material loss, but also d...

AI Technical Summary

Problems solved by technology

[0005] The invention provides a method for inhibiting the polymerization of vinyl compounds, which comprises adding components comprising piperidine oxygen free radicals, nitrophenol and/or benzoquinone polymerization inhibitors to the vinyl co