Graphene modified waterborne polyurethane resin and preparation method thereof

Abstract

The invention discloses graphene modified waterborne polyurethane resin and a preparation method thereof. The preparation method specifically includes: subjecting graphene oxide obtained through a Hummers method to functional modification and dispersing to obtain a high-concentration graphene aqueous dispersion; adding polyester polyol (or polyether polyol) and a hydrophilic chain extender which are of formula ratio into the graphene aqueous dispersion, evenly stirring, and removing moisture under a vacuum condition; feeding nitrogen immediately after the vacuum condition is ended, adding diisocyanate of formula ratio, performing heating and stirring reaction for a certain time, then stopping nitrogen feeding, and adding a neutralizing agent; adding deionized water, performing high-speed dispersing for a certain time, then adding a small-molecule chain extender to perform reaction, and discharging. The preparation method has the advantages that the method is simple and controllable inoperation and capable of easily preparing and synthesizing the graphene modified waterborne polyurethane resin in a large-batch manner; the graphene modified waterborne polyurethane resin prepared bythe method is good in adhesive force, corrosion resistance and impact resistance and widely applicable to fields such as the marine field, steel structures, anti-static coating, conductive coating andantifouling and waterproof coating.

Description

technical field [0001] The invention belongs to the technical field of water-based resin synthesis, and relates to a graphene-modified water-based polyurethane resin and a preparation method thereof. Background technique [0002] With the enhancement of people's awareness of environmental protection, more and more attention has been paid to the issue of material safety. When traditional solvent-based materials are used, there is pollution from organic fusion agents, which has a serious impact on production workers and the ecological environment. Water-based polyurethane is a polyurethane emulsion that uses water as a dispersion medium. In addition to the excellent performance of solvent-based polyurethane, it also has It has the advantages of simple use, non-toxicity, and no environmental pollution. However, since water-based polyurethane emulsion uses water as a diluent, the surface tension of the medium water is relatively large, which leads to the disadvantages of poor su...

AI Technical Summary

Problems solved by technology

When traditional solvent-based materials are used, there is pollution from organic fusion agents, which has a serious impact on production workers and the ecological environment. Water-based polyurethane is a polyurethane emulsion that uses water as a dispersion medium. In addition to the excellent performance of solvent-based polyurethane, it also has It has the advantages of simple use, non-toxicity, and no environmental pollution. However, since water-based polyurethane emulsion uses water as a diluent, the surface tension of the medium water is relatively large, which leads to the disadvantages of poor surface spreading and low mechanical properties during the film formation process. The hydrophilic group of water-based polyurethane stably dispersed in the medium water will cause water-based polyurethane to have poor water resistance and easy water absorption after film formation, resulting in the disadvantages of easy foaming of the coating film.

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