Method for preparing polyacrylonitrile spinning solution

Abstract

The invention relates to a method for preparing polyacrylonitrile spinning solution, which mainly solves the problem that a reactor easily has phenomena of adhesion, gelation and shake in the late period of polymerization in the reaction process of preparing the polyacrylonitrile spinning solution in the prior art. The problem is better solved by a technical scheme that a reactor with a double helical ribbon stirring blade is adopted in the process of preparing the polyacrylonitrile spinning solution, the lower part of the reactor has a truncated cone shape, and the double helical ribbon stirring blade corresponding to the lower part is a conical double helical ribbon stirring blade. The method can be applied to industrial production of the polyacrylonitrile spinning solution.

Description

technical field

[0001] The invention relates to a method for preparing polyacrylonitrile spinning dope. Background technique

[0002] There are many ways to polymerize acrylonitrile. Free radical polymerization mainly includes solution polymerization (SL), emulsion polymerization, suspension polymerization (SP) and bulk polymerization; it can be divided into homopolymerization or copolymerization according to the ratio of polymerized monomers; it can be divided into organic solvents and inorganic solvents according to the solvent used in polymerization ; According to the polymerization and spinning process, it can be divided into one-step method and two-step method. The so-called one-step method is that the solvent used can dissolve both the monomer and the polymer resin. The solution after polymerization can be directly used for spinning. Polymerization and spinning are a complete production line. The chain transfer constants of acrylonitrile radicals in different solvent...

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