Preparation method of poly-2-vinylimidazoline

[Physical and chemical properties] Pure poly-2-vinylimidazoline (without ester, carboxyl and amido, and unreacted cyano and polyamine) is a colorless solid; the crude product of poly-2-vinylimidazoline sulfate is pale yellow particles , The refined product is white; poly-2-vinylimidazoline hydrochloride is a yellow resin, both of which are soluble in water

[Structural formula]

[Preparation method] There are 3 methods for preparing poly-2-vinylimidazoline: ① ethylene diamine and acrylonitrile synthesis method; ② ethylene diamine and polyacrylonitrile synthesis method; ③ monomer vinyl imidazoline polymerization method

(1) Synthesis of ethylenediamine and acrylonitrile

The method uses ethylenediamine and acrylonitrile as raw materials, and the reaction process is as follows:

In a 2L flask containing 480.

(2) Synthesis of ethylenediamine and polyacrylonitrile

This method can use waste polyacrylonitrile fiber to obtain poly-2-vinylimidazoline

(3) Monomer polymerization method

Add 100.

Take white clean 2-vinyl 2 imidazoline as raw material, add sulfuric acid or hydrochloric acid to make 2-vinyl-2-imidazoline sulfate or 2-vinyl 2-imidazoline hydrochloride, and use the mass fraction as 50% Adjust the pH value of the system to 3.

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