A kind of hydroxy acid modified aqueous two-component polyurethane dispersion system and preparation method thereof

Abstract

The invention relates to a hydroxy acid modified waterborne two-component polyurethane dispersion system, and a preparation method thereof. The dispersion system mainly comprises the following components: a component a: any hydroxy acid with low possibility of internal dehydration reaction, or a mixture of any two or more hydroxy acids with low possibility of internal dehydration reaction; a component b: any compound(s) on which catalytic polymerization can be carried out through active hydrogen; a component c: a catalyst; a component d: acrylic acid and an acrylic ester monomer; and a component e: a waterborne polyisocyanate curing agent. A dispersion modification method and two-component polyurethane dispersions, which are obtained after crosslinking of dispersions obtained through the method and hydroxyl functional group reactants, can be used in industrial fields such as high-grade automobile finish paint and leather; through hydroxy acid modification, a product obtained from the catalytic polymerization through the active hydrogen can be effectively introduced into the system, and the system can effectively achieve the waterborne property through the product; and moreover, different products obtained from the catalytic polymerization through the active hydrogen can be introduced to effectively overcome the defects of two-component polyurethane, reduce the system viscosity,and improve the gloss and fullness of a resin paint film.

Description

technical field [0001] The invention belongs to the field of preparation of water-based two-component polyurethane dispersions, and in particular relates to a new preparation technology of a hydroxy acid-modified water-based two-component polyurethane system. Background technique [0002] Two-component polyurethane is a polyurethane resin formed by curing and cross-linking compounds containing hydroxyl functional groups and polyisocyanate curing agents. Two-component polyurethane has received more and more attention in industrial production, and its production scale is also growing. There is also an increasing need to prepare two-component polyurethane self-drying paints using hydroxyacrylic dispersions. However, there are more or less shortcomings in the application process of two-component polyurethane, such as high solvent content, high viscosity and low solid content. The low solid content and high viscosity have also caused a series of problems. Low viscosity and high ...

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Problems solved by technology

[0004] However, while increasing the solid content of the resin and reducing the viscosity of the resin, there are also major problems. The additives are often very hydrophobic and have good lipophilicity. In addition, the additives prepared by a certain grafting method are also There is a problem of strong hydrophobicity, such as polyether polyol, etc., and the hydroxyacrylic acid dispersion requires a low solvent content, so in the system where water is the dispersion medium, oily additives are often not added. However, adding a small amount of oily substances to the system has little effect on the resin and can also improve the performance of the resin to a certain extent, but too much addition will lead to poor stability of the entire resin system, especially in terms of self-emulsifying resins

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