Emulsion polymerization method using reactive emulsifying agent, aqueous polymer dispersion obtained by same, and polymer film

Abstract

Provided is an emulsion polymerization method for carrying out emulsion polymerization of monomers using a reactive emulsifier in an aqueous medium in the presence of a polymerization initiator, the emulsion polymerization method being capable of solving problems such as an enhancement of a rate of copolymerization of the reactive emulsifier with the monomer, dissolution of a bubbling trouble, a more improvement of water resistance of a coating film, etc. The emulsion polymerization is carried out using one or two or more kinds of polymerizable unsaturated monomers X having at least one carbon-carbon double bond in a molecule, one or two or more kinds of reactive emulsifiers Y having at least one polymerizable group in a molecule, and one or two or more kinds of polyfunctional monomers Z1 having two or more polymerizable unsaturated groups in a molecule and having a molecular weight per functional group of less than 150, or one or two or more kinds of hydrophilic monomers Z2 having one polymerizable unsaturated group and a hydrophilic group in a molecule and having an average molecular weight of less than 250, with a proportion of the total use amount of the polyfunctional monomer Z1 or hydrophilic monomer Z2 to the total use amount of the reactive emulsifier Y being in the range of Z1 / Y = 1 / 3 to 1 / 30 or Z2 / Y = 1 / 1 to 1 / 30 in terms of a mass ratio.

Description

technical field [0001] The present invention relates to an emulsion polymerization method using a reactive emulsifier, and relates to an aqueous polymer dispersion and a polymer film obtained thereby. Background technique [0002] In recent years, in consideration of the global environment and the working environment, the transition from a solvent system to a water system has progressed in resin manufacturing processes, adhesives, paints, and the like. Therefore, in various fields, the required properties of aqueous polymer dispersions (including polymer emulsions and latexes) are increasing. The polymer dispersion obtained by the emulsion polymerization method is used for the production of resins and coating materials, and the functions of the coating films formed by coating the coating materials include protection, beauty, and functional provision of objects. More specifically, the protection of the object includes anti-corrosion, anti-fouling, waterproof, chemical resist...

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Problems solved by technology

[0017] More specifically, the purpose is that, depending on the type of reactive emulsifier, the type of monomer, or the polymerization conditions, the reaction rate of the reactive emulsifier in the system may decrease, and a large amount of free emulsifier in the system may remain. Problems such as the possible increase in the content of desired by-products are solved, the copolymerization rate of reactive emulsifiers and monomers is improved, and the bubble problem closely related to its production efficiency is eliminated in its manufacturing process. Suppresses the whitening (cloudiness) phenomenon, water absorption-swelling phenomenon, and decrease in adhesion of the polymer coating film that occurs when the polymer coating film is in contact with water or when the coating film is placed in water.

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