VOC-free (volatile organic compounds free) epoxy resin and HNT (halloysite nanotube) composite self-repair coating and preparation method thereof

Abstract

A VOC-free (volatile organic compounds free) epoxy resin and HNT (halloysite nanotube) composite self-repair coating comprises the following components: waterborne epoxy resin and HNT composite emulsion, a curing agent, 0.1-0.8 part of a leveling agent, a wetting agent and a defoaming agent; a preparation method includes the steps: first, weighing 69.5-145 parts of waterborne epoxy resin emulsion in a three-port flask, weighing 0.5-5 parts of HNT loading a corrosion inhibitor, adding to the three-port flask, and electrically and chemically stirring; second, ultrasonically dispersing, moving to an electric stirring device, stirring, repeating three times to form disperse, stable and homogeneous waterborne epoxy resin and HNT composite emulsion; third, mixing well the waterborne epoxy resin and HNT composite emulsion, the curing agent, the leveling agent, the wetting agent and the defoaming agent to required fineness; the coating has antiseptic and self-repair functions; the coating is green, nontoxic and harmless, good in adhesion, high in hardness, simple to prepare and low in production cost.

Description

technical field [0001] The invention relates to the field of nano-hybrid self-healing coatings and composite materials, in particular to a VOC-free epoxy resin / HNTs composite self-healing coating and a preparation method thereof. Background technique [0002] Halloysite nanotubes (HNTs) is a natural inorganic aluminosilicate, which is a hollow tubular structure formed by natural curling of aluminosilicate sheets after weathering, with a large aspect ratio. The inner diameter is about 5-20 nm, the outer diameter is about 10-50 nm, and the length is about 100-400 nm. The outer layer of the tube is a silicon-oxygen tetrahedral layer, and the inner layer is an aluminum-oxygen octahedral layer. HNTs have the advantages of strong thermal stability and large specific surface area, coupled with their unique hollow nanotube structure and surface structure, and are widely used in composite materials, ceramics, nano templates, catalyst supports and other fields. As a filler, it can e...

AI Technical Summary

Problems solved by technology

In addition, the current polymer-based self-healing nanomaterials are usually: nano-silica, nano-metal ions, nano-metal oxides, etc., but they need to be prepared independently, the cost is high, and it is not economical and environmentally friendly.

[0004] At present, there are no water-based epoxy resin self-repairing materials added with halloysite nanotubes on the market, nor have there been reports

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