Anionic acrylic emulsion containing cationic monomer and preparation method of emulsion

Abstract

The invention relates to an anionic acrylic emulsion containing a cationic monomer and a preparation method of the emulsion. Based on the dry weight of the emulsion, the anionic acrylic emulsion is prepared from a monomer comprising the following components: 80-99 wt% of an acrylate monomer, 0.1-10 wt% of functional monomer acid, 0.1-10 wt% of a cationic monomer and 0.1-5 wt% of an emulsifier. Thepreparation method adopts a step-by-step emulsion polymerization method and includes, firstly, polymerizing a pre-emulsion containing the functional monomer acid; then neutralizing with a neutralizing agent; and then polymerizing the pre-emulsion containing the cationic monomer. The preparation method can be carried out on normal production equipment of the anionic acrylic emulsion without additional equipment. Due to the introduction of the cationic monomer containing amino groups in the anionic acrylic emulsion, a water-based wood sealing primer prepared by the anionic acrylic emulsion hasexcellent tannic acid sealing performance, and overcomes the limitation of raw material selection and construction inconvenience in preparing the primer by the cationic acrylic emulsion.

Description

Technical field: [0001] The invention relates to an anionic acrylic emulsion containing a cationic monomer and a preparation method thereof, belonging to the field of acrylic emulsion synthesis. Background technique: [0002] It is imperative to replace oil-based wood coatings with water-based wood coatings. Among them, water-based white paints or light-colored paints on the market are more and more popular among consumers, but wood is prone to yellowing and bleeding after painting with water-based white paints. This is caused by the tannic acid in the wood. If the water-based paint can seal the tannic acid in the wood, it can avoid the yellowing of the wood after the white paint is applied, so the water-based wood sealing tannic acid primer came into being. [0003] At present, the emulsions with this function are mainly some cationic emulsions, such as XK350 of DSM Company, Syntran6305 of Interpolymer Company, etc. Chinese published patent CN103992429 carries out emulsion...

AI Technical Summary

Problems solved by technology

Chinese published patent CN103992429 carries out emulsion polymerization with acrylate monomers and cationic monomers, and uses cationic emulsifiers as stabilizers to prepare a cationic copolymer emulsion. The latex particles are positively charged, but cationic emulsions cannot be anionic when mixing paint Auxiliaries of different natures, resulting in restrictions on raw material selection and inconvenience in construction

Chinese published patent CN101481437A prepares an anionic self-crosslinking acrylic emulsion that can be used for sealing primers, but the normal emulsion polymerization method is used, which will cause the polymerization process to be extremely unstable

Chinese published patent CN101787098A discloses a method for preparing an acrylate hybrid emulsion. The two-component coating prepared from the emulsion has excellent water resistance and solvent resistance and good mechanical properties: firstly, water, emulsifier, Alkyl (meth)acrylate and alkacrylic acid, etc. prepare seed emulsion, then continue to add alkyl (meth)acrylate and alkacrylic acid and hydroxyalkyl (meth)acrylate dropwise to seed emulsion, dropwise Neutralizer; add dropwise alkyl (meth)acrylate, functional amide, hydroxyalkyl (meth)acrylate, wherein the functional amide can be dimethylaminoethyl methacrylate, which can be crosslinked by introducing The amino group, hydroxyl group, amido group, diacetone acrylamide group, etc. improve the water resistance and solvent resistance of the coating film; and in this method, the neutralizer is added in the first step of the reaction process, which will make the acid tend to polymerize in the water phase, Destabilize latex particles

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