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CNC/PEG composite coating and preparation method thereof

A composite coating, stirring and mixing technology, applied in coatings, polyether coatings, cellulose coatings, etc., can solve the problems of single and unadjustable color coatings, environmental pollution, etc., achieve bright structural colors, simple preparation process, easy to control effects

Active Publication Date: 2017-04-26
南京锐牛能环新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to solve the problems of the prior art that the color of the color coating is single and cannot be adjusted, and has environmental pollution, and provides an environmentally friendly and degradable composite coating with adjustable color

Method used

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  • CNC/PEG composite coating and preparation method thereof
  • CNC/PEG composite coating and preparation method thereof
  • CNC/PEG composite coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0020] 1) Preparation of cellulose nanocrystal suspension: mix 4.0g microcrystalline cellulose with 80ml concentration of 64wt% sulfuric acid, mechanically stir in a water bath at 50°C for 2 hours, then add 5 times the amount of distilled water to stop the hydrolysis reaction, dilute Pour the suspension into a dialysis bag, dialyze in distilled water for several days to remove excess acid, small molecular weight sugars, and other water-soluble impurities; obtain an aqueous cellulose nanocrystalline CNC suspension with a pH of about 6.0, and a concentration of 0.5 wt%. (The references for the preparation method of cellulose nanocrystal suspension here are Liu, D.; Wang, S; Ma, Z.; Tian, ​​D.; Gu, M.; Lin, F. Structure-color mechanism of iridescent cellulose nanocrystal films.RSC Adv.2014,4,39322-39331.)

[0021] 2) Preparation of PEG solution: Disperse 5 g of PEG20000 in 100 ml of distilled water, stir to make it fully dissolved, and then let the system stand to remove air bub...

Embodiment 2

[0024] The difference between this example and Example 1 lies in step 3), adding 0.5ml concentration of 5% PEG solution into 50ml cellulose nanocrystal suspension respectively, stirring and ultrasonic treatment for 2min under 200W power in an ultrasonic cleaner , and mix uniformly to obtain a CNC / PEG composite suspension; the CNC / PEG composite suspension is evaporated and concentrated under ambient conditions, and then subjected to defoaming treatment to obtain a CNC / PEG composite coating stock solution.

Embodiment 3

[0026] The difference between this example and Example 1 lies in step 3), adding 0.75ml concentration of 5% PEG solution into 50ml cellulose nanocrystal suspension respectively, stirring and ultrasonic treatment for 2min under 200W power in an ultrasonic cleaner , and mix uniformly to obtain a CNC / PEG composite suspension; the CNC / PEG composite suspension is evaporated and concentrated under ambient conditions, and then subjected to defoaming treatment to obtain a CNC / PEG composite coating stock solution.

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Abstract

The invention discloses a CNC / PEG composite coating. The CNC / PEG composite coating contains cellulose nanocrystals and polyethylene glycol, wherein the polyethylene glycol accounts for 0-50% of the mass percentage content of the cellulose nanocrystals, the particle length dimension of the cellulose nanocrystals is 151-167 nm, and the diameter is 48-52 nm. The invention further discloses a preparation method of the CNC / PEG composite coating. Natural cellulose is utilized as a raw material, the non-toxic and pollution-free PEG is utilized as a coating color regulator and a plasticizer, the prepared colorful coating is environmentally friendly and is degradable, the mechanical properties are greatly improved, and a structural color is bright and can be adjusted and controlled. In addition, the coating can be prepared through blending and compounding and dropwise simple coating on the surface of a base material, the preparation process is simple and easy to control, and the cost is low.

Description

technical field [0001] The invention belongs to the coating field, in particular to a CNC / PEG composite coating and a preparation method thereof. Background technique [0002] The commonly used methods of preparing colored coatings are mostly prepared by chemical reactions, such as the reaction of inorganic salts and sodium stearate, or grafting of fluorine-containing nitrogen dyes. These methods will cause many pollution problems and the preparation costs are relatively high; However, the current typical commercial polyurethane coatings have a high content of organic solvents, which can cause serious VOC pollution; the color coatings in the prior art have a single color and cannot be adjusted. [0003] Cellulose nanocrystals are a new type of cholesteric liquid crystal material, and the crystals will undergo anisotropy to isotropy at high concentrations until the liquid crystal phase transition is formed. Cellulose nanocrystals have light weight, excellent mechanical prope...

Claims

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Application Information

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IPC IPC(8): C09D101/04C09D171/02
CPCC08L2201/06C09D101/04C08L71/02
Inventor 刘大刚顾明月
Owner 南京锐牛能环新材料科技有限公司
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