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Method for carrying out reinforcing and sealing-protection on wood by using nano cellulose

A nanocellulose and wood technology, applied in wood processing appliances, wood treatment, impregnating wood, etc., can solve the problems of low microstructure strength, cumbersome preparation process, poor environmental performance, etc., to improve wood quality and added value, chemical Good stability and thermal stability

Active Publication Date: 2019-08-30
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still shortcomings such as low microstructure strength, poor wear resistance, easy aging, cumbersome preparation process, and poor environmental protection performance.
[0003] At present, nanocellulose-based materials have made some progress in superhydrophobic research, such as the successful preparation of nanocellulose superhydrophobic membranes, etc., but there are few methods that directly use nanocellulose as the main material to seal and reinforce the surface of wood.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] The said nano cellulose sealing solution is a mixture of 1% cellulose nanocrystals (CNC), 0.5% hydroxypropyl cellulose (HPC) and 0.5% silica sol.

[0053] Take a mixture of 1% CNC and 0.5% HPC. First, configure 20ml of 1% HPC at room temperature, add 20ml of distilled water, and place it on a magnetic stirring table at a stirring speed of 150rpm. Stir evenly to obtain 0.5% HPC. Weigh 40ml of CNC with 1% concentration, pour it into a beaker, place it on a magnetic stirrer at a stirring speed of 100rpm, add 40ml of HPC with a concentration of 0.5% at room temperature, stir evenly, and then add 0.5%, The silica sol with a pH value of 10-11 is continuously stirred evenly to obtain a nanocellulose encapsulating solution. According to the measured water permeability of the wood, take poplar wood and process it into a sample with a size of 20mm × 20mm × 20mm. Place the wood in an oven for drying treatment at a drying temperature of 103±2°C. After drying for 6 hours, each Weigh ...

Embodiment 2

[0056] The nano cellulose sealing solution is a mixture of 0.15% carboxymethyl cellulose, 0.15% TEMPO oxidized nanofibers and 0.8% silica sol. The difference from the embodiment is that camphor wood is processed into a sample with a size of 20mm × 20mm × 20mm, and dried to a moisture content of about 10%. The wood sample is placed in an immersion treatment tank and immersed in the above modification. In the sexual fluid, first vacuumize to 0.08MPa, keep the vacuum for 50min, release the vacuum, pressurize to 1MPa, and maintain the pressure for 3h. The pressure was released, the test piece was taken out and placed in an oven at 70°C for 5h to obtain nano-cellulose encapsulated wood. The surface hardness of wood is increased by 7.8%. The wear resistance of the wood surface is increased by 7%. The contact angle increased to 9%, and the wood color difference changed little.

[0057] In a word, the present invention can improve the dimensional stability, density, flexural elastic m...

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Abstract

The invention belongs to a method for carrying out reinforcing and sealing-protection on wood by using nano cellulose. The method comprises the following steps: classifying the wood according to waterpermeability of the wood, and performing brushing or immersion treatment on the wood according to classification with a nano-cellulose sealing-protection liquid prepared by a carboxymethyl celluloseor hydroxypropyl cellulose or hydroxyethyl cellulose polymer solution with a concentration of 0.5-2.5%, a cellulose nano crystal with a concentration of 0.5-1.5%, a nano cellulose dispersion liquid ofTEMPO oxidized nano fibers with a concentration of 0.2-0.7%, and a modification liquid of a silica sol with a concentration of 0.5-1.5%. The method can improve dimensional stability, density, flexural modulus and compressive strength of the wood, and has the advantages of significantly improving quality and added values of the wood.

Description

Technical field [0001] The invention belongs to a method for reinforcing and sealing wood with nano cellulose. Background technique [0002] Wood surface sealants can protect wood against mechanical wear resistance and hydrophobicity, and have broad potential application prospects in daily life, industry and agriculture, especially in cultural relics restoration. In recent years, there have been many related researches on wood surface sealants, mainly using non-natural high molecular polymers such as polypropylene, polytetrafluoroethylene, etc. These materials have high contact angles, high transparency or multifunctional characteristics. However, there are still shortcomings such as low microstructure strength, poor wear resistance, easy aging, cumbersome preparation process, and poor environmental protection performance. [0003] At present, nano-cellulose-based materials have made certain progress in superhydrophobic research. For example, nano-cellulose super-hydrophobic membr...

Claims

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Application Information

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IPC IPC(8): B27K3/00B27K3/02B27K3/08B27K3/12B27K3/52B27K5/04
CPCB27K3/007B27K3/0214B27K3/08B27K3/12B27K3/52B27K5/04B27K2240/70
Inventor 卢芸张治国刘波殷亚方
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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