Nanocellulose powder material and preparation method, redispersed nanocellulose slurry containing the same, and application

Abstract

The invention provides a nanocellulose powder material and a preparation method, a redispersed nanocellulose slurry containing it and applications, including nanocellulose and a water-soluble polymer material; wherein, the water-soluble polymer material contains Hydrogen bonds and / or ether bonds. Applying the nano-cellulose powder material provided by the invention to water-based polymer coatings can improve the washing resistance of the coatings.

Description

technical field [0001] The invention belongs to the technical field of modified coatings, and relates to a nanocellulose powder material, a preparation method, a redispersed nanocellulose slurry containing the nanocellulose powder and its application. Background technique [0002] With the strengthening of the country's environmental protection supervision and people's increasing quality of healthy life. Environmentally friendly coatings are becoming more and more sought after by the public, and water-based polymer coatings are polymer coatings that use water as a solvent or dispersion medium. It has less toxic volatiles, no irritating odor, and is healthy and environmentally friendly. It is the most popular in the market. One of the most popular coatings, it is widely used in furniture and indoor and outdoor protective decoration, and has a good market development prospect in the future. However, compared with traditional solvent-based coatings, the principle of film forma...

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Problems solved by technology

[0004] CN106905437A discloses a high heat-resistant redispersible powder cellulose nanocrystal and a preparation method thereof. The method uses sulfuric acid to hydrolyze cellulose, and adds ionic liquid to the obtained cellulose nanocrystal suspension to make the ionic liquid and fiber The cellulose nanocrystals form ionic bonds, and the reaction solution is dried to obtain powdered cellulose nanocrystals; the ionic liquids used are AmimCI, [OMIm]BF 4 、[BMIm]BF 4 One or more of them; the raw material ionic liquid used in this technology is expensive, and the product exists in ionic bonds. In some water-based coatings, the coating will be destabilized and the storage stability of the water-based polymer material will be reduced, which is not conducive to the prepared Product promotion and application

CN109054584A discloses a nano-scale cellulose functional doping modified coating and a preparation method thereof, wherein a hydrophilic nano-cellulose dispersion A with a mass fraction of 0.1% or a hydrophobic nano-cellulose dispersion with a mass fraction of 0.1% is disclosed B and water-based or solvent-based film-forming agent (accounting for 20-60%), dispersing agent (accounting for 0.05-1.5%), coupling agent (accounting for 0.08-1.7%), drier (accounting for 0.02-1.0%), anti- Settling agent (0.01-2.5%), defoamer (0.5-1.5%), preservative (0.001-0.05%), anti-skinning agent (0.02-2.5%), leveling agent (0.01- 3.5%) and filler (10-70%) are mixed and dispersed at a high speed by a high-speed shearing machine, wherein the dry mass of nanocellulose accounts for 0.01-1% of the dry mass of the paint, and the speed is 0.01-10mL at room temperature. / min dropwise into the above-mentioned water or organic solvent-based paint, after the dropwise addition, obtain nanocellulose functional modification doping paint, the method is to use nanocellulose to prepare a coating product with excellent surface strength, but the used is 0.1 % nanocellulose dispersion, the content of nanocellulose in the dispersion is low, which is not conducive to the modification of coatings by researchers, is not conducive to long-distance transportation of products, and increases transportation costs

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