Method for preparing polymethyl methacrylate by single electron transfer living radical emulsion polymerization

Abstract

The invention belongs to the field of chemical industry and particularly relates to a method for preparing polymethyl methacrylate. The method includes the following steps that raw materials include water, emulsifying agents, catalyst copper powders, monomer methyl methacrylate, organic halidex initiators and ligand N, N, N', N', N'-pentamethyldiethylenetriamine; the water, the emulsifying agents, the monomer methyl methacrylate and the organic halidex initiators are uniformly mixed and stirred to obtain a pre-emulsion a; the water, the emulsifying agents, the ligand N, N, N', N', N'-pentamethyldiethylenetriamine and the catalyst copper powders are uniformly mixed and subjected to stirring pre-emulsification for 60 minutes to obtain a pre-emulsion b; the pre-emulsion a is added into the pre-emulsion b, and nitrogen is fed to deoxidize; the fully stirring is performed to perform the single electron transfer living radical polymerization at the temperature of 20 DEG C to 30 DEG C under the protection of nitrogen or argon, and demulsification and purification are performed to obtain the polymethyl methacrylate. The method has a good industrialization prospect.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular to a preparation method of polymethyl methacrylate. Background technique [0002] Polymethyl methacrylate (PMMA) is an industrially important polymer with a wide range of applications due to its well-known unique properties such as low density, high mechanical strength, low melting point, and good light transmission. The PMMA purchased in the market is produced by the traditional free radical polymerization method, and its molecular weight distribution is wide, and the molecular weight is difficult to control. [0003] Living / Controlled Radical Polymerization (L / CRP) is a new polymerization method developed for more than ten years. Compared with traditional free radical polymerization, this method has the advantages of large molecular weight, narrow molecular weight distribution and controllable molecular weight. , controllable molecular structure, etc. Compared with ionic polymer...

AI Technical Summary

Problems solved by technology

Of course, the SET-LRP method also has disadvantages, such as being sensitive to oxygen and requiring more expensive nitrogen-containing ligands, etc.

[0006] At present, emulsion polymerization has been successfully applied to living radical polymerization, however, the implementation of single-electron living radical polymerization has not yet been discovered.