A kind of water-based coating containing graphene/zinc-aluminum hydrotalcite nanocomposite and preparation method thereof

Abstract

The invention discloses water-based coating containing a graphene / zinc-aluminum hydrotalcite nano composition and a preparation method thereof. The water-based coating is prepared from the following components in parts by weight: 30 to 50 parts of water-based resin, 25 to 40 parts of water, 0.1 to 0.5 part of dispersing agent, 0.1 to 0.5 part of wetting agent, 0.1 to 0.5 part of defoaming agent, 0.1 to 0.5 part of thickening agent, 0.1 to 0.5 part of film forming aids, 0 to 10 parts of curing agent, 0 to 25 parts of titanium dioxide, 0 to 20 parts of calcium carbonate, and 0.1 to 2.5 parts of graphene / zinc-aluminum hydrotalcite nano composition. The graphene / zinc-aluminum hydrotalcite nano composition is added into the water-based coating, so that the high temperature resistance, the corrosion resistance, the flame retardant property, the weather resistance, the impact resistance, the abrasion resistance, the hardness and the obstruction property of the water-based coating are significantly improved, and the multiple functions of the water-based coating are improved.

Description

technical field [0001] The invention relates to a coating and a preparation method thereof, in particular to a water-based coating containing a graphene / zinc-aluminum hydrotalcite nanocomposite and a preparation method thereof, belonging to the technical field of coatings. Background technique [0002] Coatings are playing an increasingly important role in people's lives, and have become an indispensable material for the development of modern society. A large part of the current coatings use toxic and harmful organic substances as solvents and additives in the coating preparation process. During the use process, a large amount of VOC will enter the air, which is quite harmful to the environment. With the global environmental problems becoming more and more prominent, the environmental laws and regulations of various countries are becoming stricter, consumers' awareness of environmental protection is improving, and the coatings industry is also facing the test of environmenta...

AI Technical Summary

Problems solved by technology

Chinese patent "201410649883.9 A hydrotalcite-supported graphene flame retardant and its application" prepares hydrotalcite-supported graphene flame retardant by co-precipitation method, but in this flame retardant, only hydrotalcite is supported on the surface of graphene , the modification of graphene is poor. Although the obtained flame retardant can improve the flame retardant effect of polymer materials to a certain extent, the improvement is limited, and no detailed research has been made on whether the coating can improve the corrosion resistance. Note, after research, it is found that the hydrotalcite-supported graphene flame retardant has a limited improvement in the corrosion resistance of the coating and cannot meet the needs of practical applications. In addition, hydrazine hydrate is used as a reducing agent in the preparation process of the flame retardant. Hydrazine hydrate is a highly toxic substance, carcinogenic, and will spontaneously ignite and explode when in contact with oxidants, which not only pollutes the environment but also causes health hazards to the human body

Therefore, the current water-based coatings on the market usually pursue "zero VOC" and "low VOC" too much, resulting in that although the VOC content is reduced, the physical properties of the coating will also be significantly reduced at the same time, so that the VOC content and physical properties cannot be balanced.

[0007] At present, there are no related reports on modifying graphene and hydrotalcite compounds to prepare graphene / hydrotalcite composite fillers, and adding the prepared composite fillers to water-based paints, let alone graphene / hydrotalcite composite fillers. Adding fillers to water-based coatings improves the physical properties of water-based coatings such as high temperature resistance, corrosion resistance, flame retardancy, weather resistance, impact resistance, abrasion resistance, barrier properties, and hardness, and also ensures that water-based coatings do not contain VOC. Good environmental protection performance, related reports that balance the physical properties and VOC content of water-based coatings

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