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

[0051] Example 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 the wood quality every two hours until it is in a dry state with constant wood quality. Apply nano-cellulose sealant evenly on the surface of the wood after drying treatment and bake it until it is absolutely dry; then paint it a second time and bake it until it is absolutely dry; paint it a third time and bake it until it is absolutely dry to obtain nanofibers Plain seal protects wood.

[0054] According to GB/T 1927~1943-2009 "Test Methods for Wood Physical and Mechanical Properties", the physical and mechanical properties of poplar wood before and after modification were tested. After treatment, the weight gain rate of wood is over 35%, the equilibrium moisture content is about 7%, and the absolute dry density is 0.42g/cm before treatment. 3 Increase to 0.62g/cm 3; The expansion rate (ASE) can reach more than 50%; the flexural modulus of elasticity (MOE) increases from 11.7GPa to 16.5GPa; the flexural strength (MOR) increases by about 1%; the compressive strength along the grain increases from 49.8 MPa Up to 71.3 MPa. The surface hardness of wood is increased by 6%. The wear resistance of the wood surface is increased by 5%. The contact angle increases to 8%,

[0055] Example 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 modulus and compressive strength along the grain of wood, and has the advantages of significantly improving wood quality and added value.