Aqueous polysiloxane resin and preparation method thereof

Abstract

The invention discloses aqueous polysiloxane resin and a preparation method thereof. The aqueous polysiloxane resin is prepared from a pre-emulsion A, an emulsion B and a solution C as raw materials. The preparation method comprises the following steps: 1) preparing the pre-emulsion A; 2) preparing the emulsion B; 3) preparing the solution C; 4) pouring a part of the pre-emulsion A into a reaction container, dripping a part of the emulsion B, and at the same time heating the reaction container to 55-65 DEG C to react for 0.5-1 hour so as to prepare a light blue fluorescent seed emulsion; 5) simultaneously dripping the rest pre-emulsion A and the emulsion B into the fluorescent seed emulsion, heating to 55-65 DEG C to react for 2-3 hours, after the reaction is completed, cooling to the room temperature, adjusting the pH value to be 7-8, dripping the solution C, stirring for 10-30 minutes, and filtering, thereby obtaining a filtrate, that is, the aqueous polysiloxane resin. The aqueous polysiloxane resin is good in storage stability and flexibility, good in adhesion property, high in hardness and good in impact resistance, water resistance, salt water resistance, artificial aging resistance and chemical corrosion resistance. The aqueous polysiloxane resin is simple in preparation method, gentle in reaction condition and stable in process procedure.

Description

technical field [0001] The invention belongs to the technical field of fine chemical coatings, and in particular relates to a water-based polysiloxane resin and a preparation method thereof. Background technique [0002] The silicone acrylic resin prepared by the copolymerization of acrylate monomer and silicone has the characteristics of poor wear resistance and insufficient hardness, so it is difficult to be applied in the fields of water-based metal topcoat and water-based wood paint. The traditional preparation of water-based polyurethane-organic silicon resin uses hydroxyl silicone oil (Si-OH) to react with polyurethane (-NCO), and the resulting Si-O-C bond is easily hydrolyzed, and the stability of the prepared emulsion is poor. At present, there are relatively few formulas for preparing water-based silicone resins in China by compounding modified silicones with acrylic monomers and epoxy resins, and there are relatively few similar products. Contents of the inventio...

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Problems solved by technology

[0002] The silicone acrylic resin prepared by the copolymerization of acrylate monomer and silicone has the characteristics of poor wear resistance and insufficient hardness, so it is difficult to be used in the fields of water-based metal topcoat and water-based wood paint.

In the traditional preparation of waterborne polyurethane-organic silicon resin, the reaction between hydroxyl silicone oil (Si-OH) and polyurethane (-NCO) is used, and the Si-O-C bond formed is easily hydrolyzed, and the stability of the prepared emulsion is poor.

At present, there are relatively few formulas for preparing water-based silicone resins in China by compounding modified silicones with acrylic monomers and epoxy resins, and there are relatively few similar products.

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