Frosting coating and preparation method thereof

Abstract

The invention discloses a frosting coating. Firstly, a castor oil is used for cross-linking a prepolymer: the multifunctional-group structure in the castor oil can cross-link a polymer to a certain extent, the cross-linking degree of the polymer is increased, the interaction force among molecular chains is increased, molecular chain movement is resisted, water molecules cannot enter the molecular chains to swell the polymer, and the water absorption of an adhesive film is decreased; meanwhile, the castor oil is a triglyceride of fatty acid, due to long nonpolar fatty acid chains in molecules, the adhesive film has good hydrophobicity, and the water absorption is further reduced; meanwhile, ester groups in the castor oil have higher cohesive energy and can improve the tensile strength of the adhesive film; ethyl cellulose has better heat resistance and thermal plasticity, has good compatibility with polyurethane and can improve the comprehensive property of the prepolymer; then the polyurethane prepolymer is mixed with polysilsesquioxane for modification.

Description

technical field [0001] The invention relates to a paint, in particular to a frosted paint and a preparation method thereof. Background technique [0002] Water-based polyurethane emulsion has the advantages of adjustable hardness, excellent adhesion and flexibility, and is widely used in the fields of coatings, adhesives and inks. At present, the relatively mature anionic water-based polyurethane is synthesized mainly through the synthesis of polyurethane molecular chains. The hydrophilic group is introduced into the segment and internally emulsified. After film formation, it has certain hygroscopicity, and the mechanical properties, water resistance and solvent resistance of film formation are poor. Usually, cross-linking modification and compound modification can be used to improve the water resistance and mechanical properties of the film; [0003] In order to improve the mechanical properties, water resistance and other properties of polyurethane, while reducing product...

AI Technical Summary

Problems solved by technology

[0002] Water-based polyurethane emulsion has the advantages of adjustable hardness, excellent adhesion and flexibility, and is widely used in the fields of coatings, adhesives and inks. At present, the relatively mature anionic water-based polyurethane is synthesized mainly through the synthesis of polyurethane molecular chains. The hydrophilic group is introduced into the segment to emulsify internally, and the film has a certain degree of hygroscopicity, and the mechanical properties, water resistance and solvent resistance of the film are poor.