Anionic acrylic emulsion containing cationic monomer and preparation method thereof

Abstract

The invention relates to an anionic acrylic emulsion containing cationic monomers and a preparation method thereof. Based on the dry weight of the emulsion, it is prepared from monomers comprising the following components: 80-99 wt% of acrylate monomers, functional monomers Acid 0.1-10wt%, cationic monomer 0.1-10wt%, emulsifier 0.1-5wt%. Using a step-by-step emulsion polymerization method, first polymerize the pre-emulsion containing functional monomeric acid, then neutralize it with a neutralizer, and then polymerize the pre-emulsion containing cationic monomer. This preparation method can be used in normal anionic acrylic acid The production of the emulsion is carried out on-site without the need for additional equipment. Due to the introduction of cationic monomers containing amino groups, the water-based wood sealing primer formulated by this anionic acrylic emulsion has excellent tannic acid sealing performance, and overcomes the limitations and limitations of the raw material selection of cationic acrylic emulsion when preparing the primer. The inconvenience of construction.

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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