Preparation method for bagasse nano-crystalline cellulose and rubber composite material of bagasse nano-crystalline cellulose
A technology of nanocellulose and composite materials, applied in the field of preparation of bagasse nanocellulose and its rubber composite materials, can solve the problems of increased water absorption and biodegradability, decreased tensile strength, etc., to reduce pollution and size The effect of small and high social value and economic value
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Embodiment 1
[0045] The raw materials used in the embodiment of the present invention are bagasse and NaOH aqueous solution with a mass fraction of 15% and a temperature of 100 ° C for 90 minutes, stirred and reacted for 90 minutes, and then oxidized and bleached in NaClO solution for 60 minutes under the assistance of ultrasound after centrifugation. Available chlorine in the solution> 10g / L After the reaction is completed, it is centrifuged and washed with water. At 90°C, it is stirred and acidified with a sulfuric acid solution with a mass fraction of 50% for 150 minutes. After centrifugation, the pH is adjusted to 7, and the bagasse nanocellulose is obtained by ultrasonication for 20 minutes. Depend on figure 1 It can be seen that the obtained nanocellulose has a diameter of 20-100 nm and a length of 100-600 nm.
Embodiment 2
[0047] The raw materials used in the embodiment of the present invention are bagasse and NaOH aqueous solution with a mass fraction of 15% and a temperature of 100 ° C for 90 minutes, stirred and reacted for 90 minutes, and then oxidized and bleached in NaClO solution for 60 minutes under the assistance of ultrasound after centrifugation. Available chlorine in the solution> 10g / L After the reaction is completed, it is centrifuged and washed with water. At 90°C, it is stirred and acidified with a sulfuric acid solution with a mass fraction of 50% for 150 minutes. After centrifugation, the pH is adjusted to 7, and the bagasse nanocellulose is obtained by ultrasonication for 20 minutes. The prepared nanocellulose has a diameter of 20-100nm and a length of 100-600nm.
[0048] The function of the NaOH aqueous solution used in the present invention is to remove the lignin and hemicellulose in the bagasse, so as to make the bagasse cellulose swell, which is beneficial for the acid liq...
Embodiment 3
[0051] 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;
[0052] In the second step, 0g, 5g, 10g, 15g, and 20g of bagasse nanocellulose were added to 5 parts of evenly stirred natural rubber latex, and stirred and mixed at room temperature for 20 minutes;
[0053] In the third step, the uniformly stirred natural rubber / bagasse nanocellulose mixture is dried to a constant weight at 65° C. in a blast drying oven to obtain a solid natural rubber / bagasse nanocellulose mixture;
[0054] In the fourth step, the resulting solid natural rubber (100g dry rubber) / bagasse nanocellulose mixture is mixed with 45g, 40g, 35g, 30g, 25g of N330 carbon black on a two-roll mill, and various The additives are 2g of stearic acid, 5g of zinc oxide, 0.5g of accelerator DM, 1.5g of accelerator CZ, 1.5g of anti-aging agent 4010NA, and 1.5g of sulfur to obtain the mixed rubber. Then...
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