Preparation method of nano cellulose in high length-to-diameter ratio

[0013] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0014] 1. Example 1.

[0015] The preparation method of the high aspect ratio nanocellulose is as follows: Weigh 1000g softwood pulp, add water to the pulp concentration to 2%, at 25 ℃, pH 6.5 conditions through 150ppm of composite biological enzymes (from endoglucose Carbohydrase, exoglucanase and β-glucosidase are compounded in a ratio of 10:5:1) After treatment for 12h, the treated slurry is diluted with water to a concentration of 1.5w% and then used a Wali beater Beat the pulp until the beating degree is 65°SR, add 0.1w‰ polyethylene oxide to the resulting slurry, stir it evenly, and then circulate it in the colloid mill. The gap between the grinding discs is reduced every two cycles, and the grinding is repeated twice to obtain Nano cellulose with an aspect ratio of 500 to 1000.

[0016] Second, the second embodiment.

[0017] The preparation method of the high aspect ratio nanocellulose is as follows: Weigh 1000g softwood pulp, add water to the pulp concentration to 3%, at 30 ℃, pH 7.5 conditions by 100ppm composite biological enzyme (from endoglucose Carbohydrase, exoglucanase and β-glucosidase are compounded at a ratio of 15:10:5) After treatment for 24h, the treated slurry is diluted with water to a concentration of 2w% and then beaten with a Wali beater When the beating degree is 75°SR, the obtained slurry is added with 0.5w‰ polyacrylamide. After stirring evenly, it is cyclically processed in the colloid mill. The gap between the grinding discs is reduced every two cycles, and the cyclic grinding is performed 4 times to obtain a long Nano cellulose with a diameter ratio of 800 to 1200.

[0018] Third, the third embodiment.

[0019] The preparation method of the high aspect ratio nanocellulose is as follows: Weigh 500g each of softwood pulp and hardwood pulp, add water to the pulp concentration to 4%, and pass 50ppm composite biological enzyme under the conditions of 40℃ and pH 6.5 ( It is compounded by endoglucanase, exoglucanase and β-glucosidase in the ratio of 30:20:5) After treatment for 48h, the treated slurry is diluted with water to a concentration of 2.5w% After beating with a walli beater to a beating degree of 85°SR, the resulting slurry is added with 0.5w‰ polyethylene oxide, and after stirring it evenly, it is cyclically processed in the colloid mill, and the grinding disc gap is reduced once every two cycles. It is cyclically milled 6 times to obtain nanocellulose with an aspect ratio of 800 to 1500.

[0020] Fourth, the fourth embodiment.

[0021] The preparation method of the high aspect ratio nanocellulose is as follows: Weigh 500g each of softwood pulp and hardwood pulp, add water to the pulp concentration to 5%, and pass 100ppm of composite biological enzyme under the conditions of 50℃ and pH 8.5 ( It is compounded by endoglucanase, exoglucanase and β-glucosidase in a ratio of 15:10:3) After 48h treatment, the treated slurry is diluted with water to a concentration of 1.5w% Use a walli beater to beat to a beating degree of 95°SR. Add 0.1w‰ of talc powder with a particle diameter of 10-200nm to the resulting slurry. After stirring, it will be recycled in the colloid mill. Each cycle The gap between the grinding discs is reduced twice, and the grinding is repeated 8 times to obtain nano cellulose with an aspect ratio of 1000 to 2000.

[0022] Five, embodiment five.

[0023] The preparation method of the high aspect ratio nanocellulose is as follows: Weigh 500g each of softwood pulp and hardwood pulp, add water to the pulp concentration to 5%, and pass 150ppm of composite biological enzyme under the conditions of 50℃ and pH 8.5 ( It is compounded by endoglucanase, exoglucanase and β-glucosidase in a ratio of 10:15:1) After 48h, the treated slurry is diluted with water to a concentration of 2w%. Wali beater beats to a beating degree of 95°SR, the obtained slurry is added with 0.5w‰ of ground kaolin with a particle diameter of 10~200nm, and after stirring, it is cyclically processed in a colloid mill, twice every cycle The gap between the grinding discs is reduced once, and the grinding is repeated 10 times to obtain nano cellulose with an aspect ratio of 1200 to 2000.

[0024] Sixth, the sixth embodiment.

[0025] The preparation method of the high aspect ratio nanocellulose is as follows: Weigh 1000g hardwood pulp, add water to the pulp concentration to 5%, and pass 100ppm composite biological enzyme (from endoglucose) at 50°C and pH 8.5. Carbohydrase, exoglucanase and β-glucosidase are compounded at a ratio of 15:15:2) After 48h, the treated slurry is diluted with water to a concentration of 2.5w%, and then the walli beater is used Beating to a beating degree of 95°SR, the resulting slurry is added with 1w‰ of the ground talc and titanium dioxide mixture with a particle diameter of 10~200nm, and after stirring, it is cyclically processed in the colloid mill, twice every cycle The gap between the grinding discs is reduced once, and the grinding is repeated 10 times to obtain nano cellulose with an aspect ratio of 1200 to 2000.

[0026] Seven, embodiment seven.

[0027] The preparation method of the high aspect ratio nanocellulose is as follows: Weigh 1000g of bamboo pulp, add water to the pulp concentration to 5%, and pass 150ppm composite biological enzyme (from endoglucan) at 50℃ and pH 7.0. Enzyme, exoglucanase and β-glucosidase are compounded according to the ratio of 25:15:5) After treatment for 48h, the treated slurry is diluted with water to a concentration of 2.5w%, and then beaten with a Wali beater Until the beating degree is 95°SR, the obtained slurry is added with 1w‰ of a mixture of ground talc, kaolin and titanium dioxide with a particle diameter of 10~200nm. After stirring, it is circulated in the colloid mill, two times per cycle. The gap between the grinding discs is reduced once, and the grinding is repeated 10 times to obtain the aspect ratio of 800-1500 nanometer cellulose.