Preparation method of cross-linked polyurethane microspheres coated with carbon black particles, polyurethane microspheres and application thereof

Abstract

The invention provides a preparation method of cross-linked polyurethane microspheres coated with carbon black particles and polyurethane microspheres. The preparation method of the microspheres includes the following steps: 1) adding carbon black powder into polyisocyanate and fully dispersing Then add polyether polyol and / or polyester polyol, hydrophilized isocyanate and catalyst in turn to obtain an organic phase mixture; 2) add water to the organic phase mixture, and form carbon black in oil-in-water by high-speed shearing suspension; 3) adding a suspension stabilizer to the suspension, heating up to polymerize; 4) separating and obtaining cross-linked polyurethane microspheres coated with carbon black particles. The cross-linked polyurethane microspheres prepared by the invention have excellent matting and anti-ultraviolet functions, and can be widely used in the fields of water-based paint, water-based leather, water-based ink and personal care.

Description

technical field [0001] The invention relates to a polyurethane microsphere, a method and an application, in particular to a preparation method of a cross-linked polyurethane microsphere coated with carbon black particles, a polyurethane microsphere and an application thereof, and belongs to the technical field of polymer materials. Background technique [0002] There are two kinds of preparation methods of polyurethane microspheres: physical method and chemical method. The physical method is mainly mechanical pulverization, because it is impossible to obtain regular spherical particles, and requires high equipment and long operation time, resulting in high preparation cost. Therefore, the current mainstream preparation method of polyurethane microspheres is still chemical method. There are also two chemical synthesis routes: one is prepared by dispersion polymerization in organic solvent; the other is prepared by suspension polymerization in aqueous phase. Taking into accou...

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Problems solved by technology

The polyurethane microspheres prepared by this method are firstly reacted to form a polymer prepolymer, and then dispersed in the water phase, the obtained particles are not round enough, and the skin feeling effect is poor.

Chinese published patent CN108192074A discloses a method for preparing cross-linked polyurethane solid or hollow microspheres by aqueous phase suspension polymerization. The solid polyurethane microspheres prepared by this method can be used as matting agents and hand feel modifiers in the fields of water-based coatings and water-based inks. Hollow polyurethane microspheres have higher oil absorption value and better hand feel, and are more suitable for use in the field of personal care as an additive for color cosmetics. It is easy to age when it is used in paint, and it is not resistant to yellowing. It has no sunscreen effect when applied to color cosmetic additives, and the structure of hollow polyurethane microspheres is easy to collapse or crack, which has the defect of affecting the transparency of the paint film.

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