Preparation method of fluorine-containing polyvinylidene chloride emulsion for coating

Abstract

The invention discloses a preparation method of a fluorine-containing polyvinylidene chloride emulsion for a coating. The preparation method comprises the following steps of (1) preparing for reaction raw materials for later use; (2) preparing a seed emulsion; (3) preparing a vinylidene chloride copolymer solution; and (4) preparing the fluorine-containing polyvinylidene chloride emulsion to obtain the fluorine-containing polyvinylidene chloride emulsion for the coating. The preparation method has the characteristics of simple process, easily-controlled reaction condition, good emulsion stability, environment friendliness and the like; and the obtained fluorine-containing polyvinylidene chloride emulsion has the advantages of good adhesive force, good oxygen and water resistance, good chemical stability and good stain resistance and is particularly suitable for outdoor high-grade building exterior wall coatings, wood coatings and the like with relatively high requirements for water resistance and weather resistance.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of fluorine-containing polyvinylidene chloride emulsion for paint. Background technique [0002] Acrylate polymer aqueous emulsion has become the main film-forming substance of outdoor building exterior wall coatings and wood coatings because of its good light resistance, acid and alkali resistance, and good bonding force with substrates. However, latex coatings prepared from acrylate polymer aqueous emulsions have poor water resistance and oil resistance, and are not resistant to dirt, poor temperature resistance, and weather resistance are difficult to meet the application of outdoor building exterior wall coatings and wood coatings, and need to be maintained every year. Increased maintenance costs. Therefore, at home and abroad, the main film-forming substances of fluorine-containing water-based emulsions used for outdoor building exterior wal...

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Problems solved by technology

The PVDC latex stabilizes the system, and can be stored at 30°C and RH70% for 24 months without demulsification and precipitation, and will not be damaged by calcium and magnesium ions when used; the interior and exterior wall coatings made with it are environmentally friendly, waterproof, and moisture-proof (anti-mildew), flame retardancy conforms to UL94 standard V-0 grade, etc., but its chemical stability and weather resistance are poor

[0005] Another example is CN1120847A which discloses a lower homologue (meth)acrylic acid perfluoroalkyl ethyl ester and vinylidene chloride and (meth)acrylic acid alkyl ester and optional N-methylol acrylamide, (methyl) Copolymers of hydroxyalkyl acrylates and / or alkoxy (meth)acrylates, which can impart high water repellency, alcohol and oil repellency to fabrics under mild conditions. The invention uses "one-step" synthesis of the above-mentioned fluorinated acrylates For polymers, the content of fluorine-containing monomers used is higher than that of vinylidene chloride monomers and acrylate monomers, so it is difficult to ensure a good combination with the substrate. At the same time, the obtained latex has a large particle size and poor chemical stability. The obtained product is used for fabric

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