A kind of high-strength and high-toughness cellulose nanocrystal color film and preparation method thereof
A technology of cellulose and nanocrystals, which is applied in the field of high-strength and high-toughness cellulose nanocrystal color films and its preparation, can solve the problems of poor toughness of color films, and achieve the effect of simple methods
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Embodiment 1
[0045] Add 10 grams of pulp cellulose to 180 milliliters of 64wt% sulfuric acid, stir at 45°C for 2 hours, then add deionized water to terminate the reaction, and after the solution is allowed to stand, centrifuge at a speed of 8000 rpm / min for 10 minutes with a high-speed centrifuge. The pellet was then washed and separated again until the supernatant became cloudy. The obtained cellulose nanocrystal suspension was sonicated in an ice-water bath, and stored at 4°C for future use. The prepared cellulose nanocrystal suspension was diluted to 1 wt%, and 16.5 ml of the diluted nanocrystal suspension was sonicated in a water bath for 2 hours. After uniform dispersion, vacuum filtration was used to form a cellulose nanocrystal film, and then the cellulose nanocrystal film was placed in 16% NaOH at 70° C. for 3 hours. Then rinse with a large amount of water until neutral, and dry the rinsed cellulose nanocrystal film at room temperature to obtain a high-strength and high-toughness co...
Embodiment 2
[0049] The type of material used, the dosage and the process flow are the same as in Example 1, except that the cellulose nanocrystal suspension is uniformly dispersed and vacuum filtered to form a cellulose nanocrystal film, and then the cellulose nanocrystal film is placed in 16% NaOH for 70 ℃ for 6 hours. The treated cellulose nanocrystal film is rinsed with a large amount of water until it becomes neutral, and then the rinsed cellulose nanocrystal film is dried at room temperature to obtain a cellulose nanocrystal tough color film. physical map see figure 1 , the film is yellow; the XRD data graph of the prepared film is shown in figure 2 ; Tensile performance data is shown in Table 1; Heat-resistant performance data is shown in image 3 .
Embodiment 3
[0051] The type of material used, the dosage and the process flow are the same as in Example 1, except that the cellulose nanocrystal suspension is uniformly dispersed and vacuum filtration is used to form a cellulose nanocrystal film, and then the cellulose nanocrystal film is placed in 16% NaOH Stand at 70°C for 9 hours. Then rinse with a large amount of water until neutral, and then dry the rinsed cellulose nanocrystal film at room temperature to obtain a tough color film of cellulose nanocrystal. physical map see figure 1 , the film is green; the XRD data graph of the prepared film is shown in figure 2 ; Tensile performance data is shown in Table 1; Heat-resistant performance data is shown in image 3 .
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