A kind of preparation method of nano microcrystalline cellulose and rubber composite material based on waste paper
A technology of nano-crystallite and composite materials, applied in the field of rubber, can solve the problems of easy agglomeration, affecting the reinforcement effect of nanoparticles, and enhancing the mechanical properties of rubber composite materials, and achieve the effects of reducing pollution, broadening recycling channels, and low cost
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Embodiment 1
[0051] The raw materials used in the examples of the present invention are waste paper (office waste paper) pretreated with 10% NaOH and soaked for 16 hours, crushed and pulped in a mixer, and reacted at 60°C for 30 minutes and then centrifuged. At 65°C, 37% hydrochloric acid and 64% sulfuric acid in a mixed acid solution with a volume ratio of 4:6 for acid hydrolysis. The ratio of mixed acid to waste paper was 15ml:1g, stirred for 120 minutes, centrifuged twice, adjusted to pH 7, and ultrasonicated for 20 minutes to obtain waste paper nanocrystalline cellulose (PNC). Depend on figure 1 It can be seen that the average diameter of the prepared nanocrystalline cellulose is 100nm.
Embodiment 2
[0053] The raw material waste paper (office waste paper) was pretreated with 5% NaOH and soaked for 10 hours, crushed and pulped in a mixer, and reacted at 50°C for 15 minutes and then centrifuged. At 50°C, 37% hydrochloric acid and 50% Sulfuric acid is acidolyzed with a mixed acid solution configured at a volume ratio of 6:4. The ratio of mixed acid to waste paper is 10ml:1g, stirred for 30 minutes, centrifuged twice, adjusted to pH 7, and ultrasonicated for 10 minutes to obtain waste paper nanocrystalline cellulose (PNC). The average diameter of the prepared waste paper nano microcrystalline cellulose is about 1 micron.
[0054] The function of the NaOH aqueous solution used in the present invention is to remove the lignin and hemicellulose in the waste paper, make the waste paper cellulose swell, facilitate the acid solution to enter the molecule, and remove the ink on the waste paper. Since the natural rubber latex used is alkaline, it will break under acidic conditions, ...
Embodiment 3
[0057] In the first step, 163.93g mass fraction of 61% natural rubber latex (equivalent to 100g dry rubber) is placed in a 1L beaker, and stirred for 15min at room temperature;
[0058] In the second step, 0 g, 5 g, 10 g, 15 g, and 20 g of waste paper nanocrystalline cellulose were added to 5 parts of evenly stirred natural rubber latex, and stirred and mixed at room temperature for 20 minutes;
[0059] The third step is to pour the well-stirred natural rubber / waste paper nano-microcrystalline cellulose mixture into the tray, and spray 10% CaCl 2 The solution was demulsified, co-precipitated, washed for 16 hours, and dried in a blast drying oven at 65°C to constant weight to obtain a solid natural rubber / waste paper nano-microcrystalline cellulose mixture;
[0060] The 4th step is mixed with the N330 carbon black of the obtained solid natural rubber (100g dry rubber) / waste paper nano-microcrystalline cellulose mixture respectively and 45g, 40g, 35g, 30g, 25g on the double-roller...
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