Cationic functional fluorine-containing polymer and preparation method thereof

Abstract

The invention discloses a cationic functional fluorine-containing polymer and a preparation method thereof. The functional fluorine-containing polymer is a cationic functional fluorine-containing polymer prepared by the steps of: taking a fluorine-containing monomer, a graftable active monomer and a hydrophilic functional monomer as copolymerization monomers, firstly polymerizing, in a water phase dispersion system, the copolymerization monomers into an active precursor polymer of which the main chain contains an atom transfer free radical polymerization active side group, then initiating a cationic functional monomer by using the active side group on a solid liquid interface to perform interface atom transfer free radical polymerization, and performing polymerization to form the cationic functional fluorine-containing polymer containing a cationic type side chain. The cationic type side chain contains quaternary ammonium salt type and quaternary phosphonium salt type groups, has a very strong charge positive electrical property, and enables the polymer to have very strong antibacterial performance, hydrophilic performance and anion exchange absorbing performance, and the polymer can be applied separately to preparation or together with other resin to blending preparation of a high-hydrophilicity antibacterial separation membrane product, a gel electrolyte, an adhesive, a battery diaphragm, an anion exchange adsorbing material and an antibacterial coating, so that the application range of vinyl chloride type polymers is greatly broadened; and in comparison with an existing material, the polymer is good in hydrophilicity, is antibacterial, and is good in application prospect.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a cationic functionalized fluorine-containing polymer and a preparation method thereof. Background technique [0002] Fluorine atoms have strong electronegativity, low polarizability, weak van der Waals force and high bond energy (485.3kJ / mol) of C-F bond, which makes fluoropolymers have outstanding heat resistance, solvent resistance, acid and alkali corrosion resistance, Excellent weather resistance, flame retardancy, and unique low surface energy, etc. Fluorine-containing polymers are mainly divided into fluorine-containing olefin polymers and fluorine-containing acrylate polymers. [0003] Polyvinylidene fluoride (PVDF) is non-toxic and odorless, and its appearance is translucent or white powder or granules. Ultraviolet radiation and aging resistance; the molecular chains of PVDF are closely arranged, the crystallinity is high, the hydrophobicity is large, and t...

AI Technical Summary

Problems solved by technology

There are few water-soluble positively charged monomers copolymerized with fluorine-containing monomers in the existing fluorine-containing copolymers, so the existing fluorine-containing copolymers cannot be specially used to prepare antibacterial materials

And the comonomers in the existing fluorine-containing copolymers are mostly oil-soluble monomers (such as vinyl acetate, acrylate, etc.), and the copolymerization content can reach 10~20wt%; There is also a small amount of water-soluble monomers (such as maleic anhydride , acrylic acid, etc.), but because the fluorine-containing monomer is in the oil phase and the comonomer is in the water phase during the polymerization process, the two phases cannot be miscible, resulting in a particularly low content of water-soluble monomer components in the copolymer, only 5wt % or less, which makes the existing fluorine-containing copolymers not have good hydrophilicity

The low content of copolymeric components and the absence of positively charged comonomers greatly limit the application range of fluoropolymer materials

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