A fluorine-containing emulsifier, anionic fluorine-containing emulsion and method prepared based on the emulsifier

Abstract

The present invention discloses a fluorine-containing emulsifier as well as anionic fluorine-containing emulsion prepared based on the emulsifier and a method, and belongs to the technical field of fine chemical preparation. Fluorocarbon emulsion containing a sulfonic acid group consists of the following raw materials: fluorine-containing acrylate, butyl acrylate, styrene, acrylic acid or 2-acrylamide-2-methylpropane sulfonic acid, an emulsifier, an initiator and water. The preparation comprises: carrying out high speed shearing on all types of the raw materials (wherein 70% of the water is added, and the remaining 30% of the water is kept for later use) for 30 minutes, taking the remaining 30% of water and 5% of the pre-emulsion after obtaining pre-emulsion, raising the temperature of the water and the pre-emulsion to 50-80 DEG C under stirring, and starting to carry out heat preservation; and starting to dropwise add the remaining pre-emulsion after carrying out the heat preservation for 30 minutes, enabling the remaining pre-emulsion to react for 5-25 hours, cooling the remaining pre-emulsion to the room temperature, and discharging the cooled pre-emulsion, thereby preparing the anionic fluorine-containing emulsion . According to the present invention, the emulsifier in the emulsion directly reacts with a polymeric monomer, thereby avoiding a migration problem of a conventional emulsifier; and meanwhile the water is used as a dispersion medium, so that no organic solvent is contained, resources are saved, and environment-friendly requirements are satisfied..

Description

technical field [0001] The invention belongs to the field of fine chemicals and relates to an emulsion and a preparation method thereof, in particular to a fluorine-containing emulsifier and an anionic fluorine-containing emulsion prepared based on the emulsifier and the method. Background technique [0002] Acrylate emulsion has good film-forming properties, good workability, alkali resistance of the coating film, good color retention, and no pollution, etc., and has been widely used. However, its stain resistance, weather resistance, heat resistance, oil resistance, etc. are not satisfactory, so further optimization is needed for acrylate emulsions. [0003] Fluoropolymers are widely used due to their "three high and two phobic" properties of high surface activity, high heat resistance stability, high chemical inertness, hydrophobicity and oil repellency. At present, there are several methods for preparing common fluorine-containing emulsions: (1) homopolymerization or co...

AI Technical Summary

Problems solved by technology

At present, there are several methods for preparing common fluorine-containing emulsions: (1) homopolymerization or copolymerization of monomers under the joint action of conventional emulsifiers / fluorine-containing emulsifiers; (2) under the action of conventional emulsifiers / organic solvents Homopolymerization or copolymerization of the following monomers; (3) simple blending of polytetrafluoroethylene emulsions and conventional emulsions; but in the above methods, the final products contain conventional emulsifiers or (and) organic solvents, which is harmful to fluorine-containing Unfavorable surface properties and environment of emulsion products

Adding polymerizable fluorine-containing surfactants has become a new preparation method for fluorine-containing emulsions, but currently such fluorine-containing surfactants are mainly polyurethane-based, and organic solvents are also used in the synthesis process, and the reaction conditions are harsh.

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