Preparation method of high-strength flexible wood film

A high-strength, wood-based technology, applied in wood processing equipment, manufacturing tools, etc., can solve problems such as insufficient mechanical properties, high complexity of nano-processing, and high energy consumption, and achieve excellent mechanical strength and expand high-value utilization. Effect

Active Publication Date: 2021-12-31
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the existing "bottom-up" method of transparent nanocellulose film preparation process: high complexity of nano-processing, energy consumption Large, and seriously damaged the natural fiber skeleton structure of wood, insufficient mechanical properties and poor water resistance; provided a "top-down" approach combined with "surface synergistic modification" and "functional assembly" Novel flexible, lightweight, degradable high-strength water-resistant wood membrane and preparation method thereof

Method used

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  • Preparation method of high-strength flexible wood film
  • Preparation method of high-strength flexible wood film
  • Preparation method of high-strength flexible wood film

Examples

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preparation example Construction

[0033] The following are the specific steps of the preparation method of the high-strength flexible water-resistant wood membrane of the present invention:

[0034] (1) Dematrix treatment: 10 pieces of longitudinally cut balsa wood chips (density: 0.14g / cm 3 -0.19g / cm 3 ) is placed in 200ml of 1-2wt% sodium chlorite solution, acetic acid is added dropwise to adjust the pH value to 4.6, and the balsa is delignified by heating at 100° C. for 2 hours. After the reaction, the chips were rinsed with distilled water until neutral. Then place the treated wood chip sample in a sodium hydroxide solution with a mass fraction of 6-15 wt%, and treat it for 2 hours at a temperature of 25-90°C to remove hemicellulose from the balsa wood. Wood chips are washed to neutral to obtain dematrix treated wood.

[0035] (2) TEMPO treatment: place the dematrixed wood obtained in the above steps in 100ml, 6wt% sodium hypochlorite aqueous solution, add 16mg TEMPO, 100mg sodium bromide, and stir even...

Embodiment 1

[0041] Example 1 (Destromed Wood Membrane) - This example was without TEMPO treatment and without acetylation treatment.

[0042] (1) Take 10 pieces of longitudinally cut balsa wood chips (density: 0.14g / cm 3 -0.19g / cm 3 ) placed in 200ml of 2wt% sodium chlorite solution, acetic acid was added dropwise to adjust the pH to 4.6, and heated at 100°C for 2 hours to delignify the balsa wood. After the reaction, the chips were rinsed with distilled water until neutral.

[0043] (2) Afterwards, place the processed wood chip sample in a sodium hydroxide solution with a mass fraction of 6 wt%, and heat it at 90°C for 2 hours to remove hemicellulose from the balsa wood. Rinse to neutral to obtain destratum treated wood.

[0044] (3) Cover both sides of the dematrix-treated wood obtained in the above steps with filter paper, stainless steel mesh, and glass plates in order to flatten them, place them in a 60°C oven for drying and hot pressing for 48 hours, and perform drying and densif...

Embodiment 2

[0046] Example 2 (destratum / TEMPO treated wood film) was not treated with acetylation.

[0047] (1) Take 10 pieces of longitudinally cut balsa wood chips (density: 0.14g / cm 3 -0.19g / cm 3 ) placed in 200ml of 2wt% sodium chlorite solution, acetic acid was added dropwise to adjust the pH to 4.6, and heated at 100°C for 2 hours to delignify the balsa wood. After the reaction, the chips were rinsed with distilled water until neutral.

[0048] (2) Afterwards, place the processed wood chip sample in a sodium hydroxide solution with a mass fraction of 6 wt%, and heat it at 90°C for 2 hours to remove hemicellulose from the balsa wood. Rinse to neutral to obtain destratum treated wood.

[0049] (3) Place the de-strommed wood obtained in the above steps in 100ml, 6wt% sodium hypochlorite aqueous solution, then add 16mgTEMPO, 100mg sodium bromide, stir evenly, and react at 30°C for 4 hours. The buffer used during the reaction is a mixed phosphate solution with a pH of 6.86 and a bora...

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Abstract

The invention provides a preparation method of a high-strength flexible wood film. The preparation method comprises the following steps: carrying out matrix removal treatment, TEMPO oxidation treatment and acetylation modification treatment, and carrying out drying densification treatment on products treated in the steps to obtain the wood film. Natural wood is used as a raw material, a wood fiber skeleton is reserved through a matrix removal process from top to bottom, then TEMPO oxidation and acetylation modification synergistic treatment is performed, and finally drying densification treatment is performed to prepare the high-strength, flexible, transparent and waterproof wood film. The wood film has excellent mechanical strength, water resistance, natural degradability and the like, the full-biomass wood film can also be combined with a flexible electronic printing technology, the full-biomass wood film can be promoted to serve as a flexible base material to be applied to the research fields of intelligent wearable devices, anti-counterfeit packages, electronic tags and the like, and a theoretical basis and practical guidance are also provided for expanding high-value utilization of wood resources in the field of flexible electronic frontier science and technology.

Description

technical field [0001] The invention relates to the field of degradable biomaterials, in particular to a method for preparing a high-strength flexible wood film. Background technique [0002] Wood is one of the most abundant organic polymer resources on earth and has good natural material properties, including low density, low thermal conductivity, non-toxic, biodegradable, etc. Its unique fiber orderly arrangement structure makes it have excellent mechanical strength, which also makes it a widely used structural material. Cellulose is the skeleton material of wood cell walls. In recent years, the extraction of nanoscale fibers and the subsequent assembly of functionalized materials have made significant progress in the application research in the field of flexible and transparent biomass substrates. The wood cell wall is crushed, and the lignocellulose is extracted from the bottom up, and a high-strength flexible nanocellulose film can be prepared by suction filtration, po...

Claims

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Application Information

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IPC IPC(8): B27M1/08
CPCB27M1/08
Inventor 陈楚楚周彤王露臻刘硕徐朝阳李大纲金永灿
Owner NANJING FORESTRY UNIV
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