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Super-hydrophobic bean dreg nano-cellulose film and clean preparation method thereof

A technology of nanocellulose and cellulose, which is applied in the direction of using microorganism/enzymatic cellulose treatment, fiber raw materials, fiber raw material treatment, etc., can solve the problems of restricting the application field of nanocellulose, and achieve broadened application fields, stable performance, and improved The effect of added value

Active Publication Date: 2021-02-26
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the natural water and hygroscopic properties limit the application fields of nanocellulose

Method used

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  • Super-hydrophobic bean dreg nano-cellulose film and clean preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A clean preparation process for superhydrophobic bean dregs nanocellulose film, comprising the following steps:

[0049] Step 1: Sieve the bean dregs to obtain 40-mesh bean dregs powder; add 1% (relative to the mass percentage of absolute dry bean dregs) lipase, then add biological buffer to control the pH value at 9, and heat in an oil bath at a constant temperature of 35°C 60min, after the reaction is over, inactivate in boiling water for 5min, wash until neutral to obtain pure bean dregs;

[0050] The biological buffer added was Glycine-Tris.

[0051] Step 2: Mix the weighed choline chloride and oxalic acid in a molar ratio of 1:1-1:1, heat the oil bath to 50°C, stir magnetically for 10 minutes, add a certain amount of xylonic acid and continue stirring for 20 minutes, Until the suspension becomes a homogeneous transparent liquid, it becomes a ternary deep eutectic solvent (DES);

[0052] The molar ratio of oxalic acid and xylonic acid is 1:1.5.

[0053] Step 3: A...

Embodiment 2

[0059] A clean and high-efficiency size-controllable preparation process for high-concentration nanocellulose of bean dregs, comprising the following steps:

[0060] Step 1: Sieve the bean dregs to obtain 70-mesh bean dregs powder; add 6% (relative to the mass percentage of absolute dry bean dregs) lipase, then add biological buffer to control the pH value at 9.5, and heat in an oil bath at a constant temperature of 5°C 45min, after the reaction is over, inactivate in boiling water for 7min, wash until neutral to obtain pure bean dregs;

[0061] The biological buffer added was Glycine-Tris.

[0062] Step 2: Mix the weighed choline chloride and oxalic acid at a molar ratio of 1:1.5, heat the oil bath to 80°C, stir magnetically for 15 minutes, add a certain amount of xylonic acid and continue stirring for 10 minutes until the suspension becomes Become a homogeneous transparent liquid and become a ternary deep eutectic solvent (DES);

[0063] The molar ratio of oxalic acid and ...

Embodiment 3

[0069] A clean and high-efficiency size-controllable preparation process for high-concentration nanocellulose of bean dregs, comprising the following steps:

[0070] Step 1: First, sieve the bean dregs to obtain 80-mesh bean dregs powder; add 8% (relative to the mass percentage of absolute dry bean dregs) lipase, and then add biological buffer to control the pH value at 9.5, and oil at a constant temperature of 55°C Heating in the bath for 30 minutes, after the reaction is finished, inactivate in boiling water for 10 minutes, wash until neutral to obtain pure bean dregs;

[0071] The biological buffer added was Glycine-Tris.

[0072] Step 2: Mix the weighed choline chloride and oxalic acid at a molar ratio of 1:3, heat the oil bath to 70°C, stir magnetically for 20 minutes, add a certain amount of xylonic acid and continue stirring for 10 minutes until the suspension becomes Become a homogeneous transparent liquid and become a ternary deep eutectic solvent (DES);

[0073] Th...

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Abstract

The invention discloses a preparation process of a super-hydrophobic bean dreg nano-cellulose film. The preparation process comprises the following steps: sieving bean dregs to obtain bean dreg powderwith a size of 20-100 meshes; adding 1-10% lipase to process the bean dreg powder to obtain pure bean dregs; mixing choline chloride and oxalic acid according to a molar ratio of 1: 1-1: 3, and adding xylonic acid to obtain homogeneous transparent liquid, so as to obtain a ternary eutectic solvent DES; adding DES into pure bean dregs according to a solid-to-liquid ratio of 1: 10-1: 40, adding a catalyst, and stirring and heating at 40-100 DEG C for 20-60 minutes to obtain a bean dreg cellulose solution; carrying out microwave treatment for 1-5 minutes, then carrying out 5-20 KHz ultrasonic treatment for 2-6 minutes, adding water to carry out reverse separation, and carrying out centrifugal separation to obtain pure bean dreg nano cellulose; adding 5-15% of pullulan and 0.05-2% of bee waxinto the bean dreg nano cellulose, the super-hydrophobic bean dreg nano-cellulose film is obtained through a coating method, the water contact angle can reach 150 degrees or above, and certain glycerin resistance is achieved.

Description

technical field [0001] The invention belongs to the field of high-value utilization of natural polymers, and in particular relates to a method for cleaning and preparing agricultural waste superhydrophobic bean dregs nano-cellulose films. Background technique [0002] Nanocellulose has the advantages of high strength, biocompatibility, and degradability, and is an ideal biomass material. However, the natural water and hygroscopic properties limit the application fields of nanocellulose. Therefore, it is of great significance to construct a superhydrophobic surface of nanocellulose and explore a green, environmentally friendly, cost-effective superhydrophobic nanocellulose film material that can be used in food packaging, electronic components, etc. Contents of the invention [0003] The purpose of the present invention is to provide a clean, efficient, and environmentally friendly preparation process for superhydrophobic okara nanocellulose film, through treatment of okar...

Claims

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Application Information

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IPC IPC(8): D21B1/30D21B1/34D21C5/00C08L1/02C08L5/00C08L91/06C08J5/18
CPCD21C5/005D21C5/00D21B1/342D21B1/306C08J5/18C08J2301/02C08J2405/00C08J2491/06Y02P60/87
Inventor 李佩燚刘瑞岩王雨萌刘鹤震雷镐哲简博星李新平
Owner SHAANXI UNIV OF SCI & TECH
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