Preparation method of fluorine-containing soap-free emulsion repellent

Abstract

The invention discloses a preparation method of a fluorine-containing soap-free emulsion repellent, and relates to the technical field of fluorine-containing emulsion repellent preparation, in particular to a preparation method of an environment-friendly fluorine-containing composite emulsion repellent. The preparation method of the fluorine-containing soap-free emulsion repellent comprises the following steps that (1) a fluorine-containing polymer, a water-soluble initiator and a polymer monomer react to form a mixed solution A; and (2) the mixed solution A, the polymer monomer B, an oil-soluble initiator and a polymerization inhibitor are added to a closed reaction kettle with a supercritical carbon dioxide medium for a polymerization reaction under nitrogen atmosphere protection, and supercritical extraction is adopted after reaction completion to form a product. The method overcomes the defect that a solvent is difficultly cleaned up; the obtained product is good in stability; the yield and the purity of the generated fluorine-containing polymer are significantly increased and improved; flash polymerization is avoided; and the production efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of preparation of a fluorine-containing emulsion protective agent, in particular to a preparation method of an environment-friendly fluorine-containing soap-free emulsion protective agent. Background technique [0002] Fluorine-containing polymers refer to a class of polymers in which the hydrogen atoms on the carbon chain are fully or partially replaced by fluorine atoms. Since the fluorine atoms have strong electronegative properties, after replacing the hydrogen atoms on the organic carbon chain, the perfluoroalkyl The group endows fluorocarbon polymers with very low surface free energy, and acrylate copolymers containing fluorocarbon chains have high surface activity, high oxygen permeability, water and oil resistance, and high chemical resistance, thus endowing paper, leather, fabrics, The surface of rough media such as stone is waterproof, oil-proof and anti-fouling. [0003] In industrial production,...

AI Technical Summary

Problems solved by technology

Many enterprises have adopted the water system, but found that the water system also has many disadvantages, for example: the emulsifier and other impurities are used in the suspension and emulsion polymerization methods, so it is difficult to obtain high-purity polymers; the drying process of the product consumes a lot of energy; the production A large amount of waste water is produced in the process, which needs to be treated, etc., and the improvement of the water system to the environment is minimal, so it is necessary to find an environmentally friendly and clean solvent

[0004] Supercritical carbon dioxide has the characteristics of chemical inertness, low toxicity, non-flammability, easy recovery, and easy realization of critical state. At present, there are many domestic researches on supercritical extraction and supercritical synthesis of non-fluoropolymers. In terms of synthesis of fluoropolymers It is very few, and the experiment found that in the carbon dioxide medium, the polymerization heat of the polymerization reaction is not easy to export, and the phenomenon of violent polymerization is easy to occur.

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