Cellulose nano-fiber/polymethyl methacrylate composite film preparation method
A polymethyl methacrylate and nanofiber technology, applied in the direction of pulping with organic solvents, can solve the problems of multi-energy, low aspect ratio, fiber interruption, etc., and achieve excellent mechanical properties and rich sources of raw materials , The effect of thermal performance improvement
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[0025] Example 1
[0026] Preparation of cellulose nanofiber / polymethyl methacrylate composite membrane: Step 1) Raw material processing, take poplar wood powder, use a combination of 60 mesh and 70 mesh sieve to screen, and obtain wood powder with a fineness of 60 to 70 mesh. Weigh 15g of it for use, measure 220ml of toluene and 110ml of ethanol with a graduated cylinder, mix the two and pour them into the flask of the Soxhlet extractor, put 15g of wood flour into the Soxhlet extractor for benzene For alcohol extraction treatment, the temperature is controlled at 120°C for 6 hours. After extraction, the wood flour is taken out, placed in a petri dish, and dried naturally in a fume hood for 24 hours.
[0027] Step 2) Chemical treatment: Weigh 10 g of wood powder that has been extracted, add an appropriate amount of distilled water to filter several times, then put it in a beaker and add 500 ml of distilled water, 3 ml of glacial acetic acid and 3 g of sodium chlorite; Place it i...
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[0038] Example 2
[0039] Weigh 10 g of the wood powder that has been extracted and add an appropriate amount of distilled water to filter several times. After the last filtration is completed, put it in a beaker and add 500 ml of distilled water, 3 ml of glacial acetic acid and 3 g of sodium chlorite. Then it was heated in a water bath in a heat-collecting magnetic heating stirrer for 1 h at a temperature of 75°C. After the reaction was completed, 3 ml of glacial acetic acid and 3 g of sodium chlorite were added, and the reaction was continued under the same conditions for 1 h. This step was repeated 5 times in total. After the reaction is complete, it is repeatedly filtered and washed with distilled water until the pH value of the aqueous suspension is close to 7.
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[0040] Example 3
[0041] Prepare 500 ml of potassium hydroxide solution with 3% mass concentration, put the sample prepared in Example 1 into a beaker and pour the prepared solution, and then heat it in a water bath for 2 hours at a temperature of 90°C. After the reaction, it was repeatedly filtered and washed with distilled water until the pH value of the aqueous suspension was close to 7.
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