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Method for chemically modifying waterborne wood coatings with nanocellulose dispersed graphene

A technology of nano-cellulose and dispersed graphite, which is applied in cellulose coatings, hemi-cellulose coatings, conductive coatings, etc., and can solve problems such as poor dispersion of nanoparticles and poor mechanical properties of water-based paint films

Active Publication Date: 2020-07-03
SHANDONG AGRICULTURAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the existing nano-material modified water-based wood coating has poor dispersion of nanoparticles, resulting in poor mechanical properties of the water-based paint film, and provides a method for chemically modifying the water-based wood coating with nano-cellulose dispersion

Method used

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  • Method for chemically modifying waterborne wood coatings with nanocellulose dispersed graphene
  • Method for chemically modifying waterborne wood coatings with nanocellulose dispersed graphene
  • Method for chemically modifying waterborne wood coatings with nanocellulose dispersed graphene

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specific Embodiment approach 1

[0053] Specific embodiment one: the method for present embodiment nano-cellulose disperses graphene chemically modified water-based wood coating, comprises the following steps:

[0054] One, the preparation of the nanocellulose aqueous dispersion containing hemicellulose:

[0055] The cellulose raw material is sequentially subjected to extraction treatment and delignification treatment to obtain hemicellulose, and then mechanical pretreatment or chemical mechanical mixing pretreatment is performed to obtain a nanocellulose aqueous dispersion containing hemicellulose;

[0056] Described mechanical pretreatment, concrete operation steps are as follows:

[0057] ① Adding deionized water to the helium cellulose until the mass fraction of the helium cellulose is 0.1% to 0.3%;

[0058] ② Then use a 600bar high-pressure homogeneous mechanical treatment for 30-40 minutes to obtain a nano-cellulose aqueous dispersion containing hemicellulose, wherein the hemicellulose accounts for 20%...

specific Embodiment approach 2

[0075] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the specific steps of the extraction process described in step one are:

[0076] Crush the cellulose raw material into 90-120-mesh powder, and then carry out extraction treatment with benzyl alcohol for 10-12 hours; the benzyl alcohol is a mixture of toluene and absolute ethanol in a volume ratio of 2:1. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0077] Specific embodiment three: the difference between this embodiment and specific embodiment one is: the specific steps of delignification treatment described in step one are:

[0078] ① Immerse the extracted cellulose powder in a sodium chlorite solution with a mass concentration of 1% to 1.2%, adjust the pH value of the solution to 4 to 5 with glacial acetic acid, and then magnetically place it in a constant temperature water bath at 75 to 80°C. Heat and stir for 1 to 1.5 hours;

[0079] ②Immerse the cellulose powder obtained in step ① into a sodium chlorite solution with a mass concentration of 1% to 1.2%, adjust the pH value of the solution to 4 to 5 with glacial acetic acid, and then magnetically heat it in a constant temperature water bath at 75 to 80°C Stir for 1~1.5h;

[0080] ③ Repeat step ② for 5-6 times to basically remove the lignin, then filter and wash the obtained liquid with a Buchner funnel until the filtrate is neutral, and finally obtain hedophilic cell...

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Abstract

The invention relates to a method for modifying waterborne wood coating, in particular to a method for chemically modifying the waterborne wood coating by using nano-cellulose dispersed graphene, aiming at solving the problem that the existing waterborne wood coating modified by using nanometer materials is poor in nano particle dispersity, so that the waterborne paint film is poor in mechanical properties. The method comprises the following steps: 1, preparing a hemicellulose-containing nanocellulose aqueous solution enabling cellulose raw materials to be sequentially subjected to extractiontreatment and delignification treatment to obtain holocellulose; then, carrying out mechanical pretreatment or chemical and mechanical mixed pretreatment to obtain a hemicellulose-containing nanocellulose aqueous solution; 2, stably dispersing graphene by using nano-cellulose; 3, carrying out in-situ chemical modification on the waterborne wood coating by using the nano-cellulose dispersed graphene. The method can remarkably improve the mechanical properties, such as adhesion, wear resistance, hardness and impact resistance, of the waterborne wood coating, and even endows the paint film with certain functionality such as electrical conductivity, thermal conductivity, ultraviolet resistance and aging resistance. The method provided by the invention is used for the field of waterborne wood coatings.

Description

technical field [0001] The invention relates to a method for modifying water-based wood coatings. Background technique [0002] Wood surface finishing is the main means of wood protection and decoration. Solvent-based paints and oil-based paints have always been the mainstream paint types in the furniture industry in the past. However, in recent years, with the strengthening of people's awareness of environmental protection and the promulgation of national mandatory policies, the application of solvent-based and oil-based coatings with high VOC release characteristics has been greatly restricted, while environmentally friendly water-based wood coatings with low VOC release characteristics are becoming more and more popular. Favored by the industry, it has become the mainstream trend in the development of wood coatings. Unfortunately, the water-based wood coatings on the market have problems such as low solid content, weak interaction between components and the substrate, r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/08C09D101/02C09D105/14C09D7/62C09D5/24C08G18/66C08G18/48C08G18/32C08G18/34
CPCC08G18/3206C08G18/348C08G18/4825C08G18/6674C08G18/6692C08L2201/04C08L2201/08C08L2205/03C08L2205/035C09D5/24C09D7/62C09D175/08C08L1/02C08L5/14C08K9/10C08K3/042C08L33/04
Inventor 董晓英李永峰
Owner SHANDONG AGRICULTURAL UNIVERSITY
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