Modified inorganic nano particle, composite waterborne polyurethane resin and application thereof

Abstract

The invention provides modified inorganic nano particles, composite waterborne polyurethane resin, and a preparation method and application thereof. The preparation method of the modified inorganic nano particles comprises the following steps of: (1) preparing a fluorine-containing polyaminosilane coupling agent by using fluorine-containing acrylic acid and a polyaminosilane coupling agent; (2) preparing fluorine-containing polyamino silane coupling agent hydrolysate; (3) preparing dispersion liquid of the inorganic nano particles; (4) preparing the modified inorganic nano particles by using the dispersion liquid of the inorganic nano particles and the fluorine-containing polyamino silane coupling agent hydrolysate. The modified inorganic nano particle composite waterborne polyurethane resin is prepared by the reaction of the following substances: modified inorganic nano particles, diisocyanate, polymer polyhydric alcohol, a nonionic hydrophilic compound, a sulfonic acid type hydrophilic chain extender and an organic amine chain extender. The modified inorganic nano particles and the composite waterborne polyurethane resin thereof have good performance, simple preparation method and wide application.

Description

Technical field [0001] The invention belongs to the field of polymers, and particularly relates to modified inorganic nanoparticles and their composite water-based polyurethane resins as well as their preparation methods and uses. Background technique [0002] Water-based polyurethane adhesive uses water as the solvent, contains almost no volatile organic compounds (VOC), has a simple process, and has good bonding strength to various materials. It is widely used in leather, shoemaking, automotive interiors, construction and Timber and other fields. [0003] Water-based polyurethane adhesive contains a large number of polar groups (urethane, urea bonds, hydroxyl groups, etc.) and has unique soft and hard segments, which not only has good cohesion and bonding strength, but also is water-resistant. Solvent, low VOC content, low temperature resistance and other advantages. However, due to the need for emulsification, its prepolymer is mainly composed of linear thermoplastic po...

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Problems solved by technology

[0007] Chinese published patent CN 104844778B discloses a polyester-based aqueous polyurethane dispersion double-modified by organosilicon and tetraacicular zinc oxide. A chemical reaction occurs to connect to the polyurethane molecular chain to improve compatibility, but the present invention uses highly reactive aromatic isocyanate in the prepolymerization process, and simultaneously adds amino silicone oil and γ-aminopropanol containing highly reactive amino groups Triethoxysilane modified tetraacicular zinc oxide will not only destroy the growth of polyurethane molecular chains, affect the molecular weight, but also not conducive to the subsequent chain extension reaction and prone to yellowing

[0008] Therefore, it is necessary to develop a new modification and addition method of inorganic nanoparticles to overcome its poor compatibility with polyurethane molecular chains, and to solve the difficulty of process control caused by existing silane coupling agents containing highly active reactive groups. Prone to problems such as gel

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