Method for preparing functional wood by resin impregnation pretreatment of wood

A technology of resin impregnation and pretreatment, which is used in impregnating wood, pretreatment equipment, wood treatment, etc., can solve the problems of single product function, poor durability, complicated preparation process, etc., and achieve simple production process, reduce production cost, and reduce hydroxyl groups. effect of quantity

Inactive Publication Date: 2019-04-30
BEIJING FORESTRY UNIVERSITY
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AI-Extracted Technical Summary

Problems solved by technology

[0004] In order to solve the problems of single product function, poor durability and complex preparation process in the existing wood modification, the purpose of the present invention is to provide a method for modifying wood. Firstly, succinic anhydride is used to pretreat the wood to improve wood performance. , to make the wood obtain carboxyl grafting anchor points, and add a functional modifie...
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Abstract

The invention discloses a method for preparing a functional wood by resin impregnation pretreatment of a wood, and belongs to the technical field of wood modification. The method concretely includes the following four steps: pretreatment of the wood by using succinic anhydride, drying treatment, impregnation of the succinic anhydride pretreated wood by using melamine modified urea-formaldehyde resin, and vacuum drying treatment. A wood sample with the water content of 20% or below is pretreated by using succinic anhydride, and the pretreated wood is dried to obtain the succinic anhydride modified wood; and the water-soluble low molecular weight melamine-modified urea-formaldehyde resin is impregnated into the succinic anhydride-modified wood by a vacuum pressure impregnation technique, andthen the impregnated wood is subjected to the vacuum drying treatment to finally obtain the functional wood. Compared with methods using single resin impregnation treatment, the method adopted in theinvention enhances the dimension stability, mechanical properties and durability of the prepared wood and makes the wood have excellent thermal stability and flame retardation performance due to thegeneration of new strong chemical bonds between the resin impregnation modifier and the succinic anhydride pretreated wood.

Application Domain

Wood treatment detailsPretreatment apparatus +2

Technology Topic

Water contentChemistry +11

Image

  • Method for preparing functional wood by resin impregnation pretreatment of wood
  • Method for preparing functional wood by resin impregnation pretreatment of wood
  • Method for preparing functional wood by resin impregnation pretreatment of wood

Examples

  • Experimental program(3)
  • Comparison scheme(3)

Example Embodiment

[0022] Example 1
[0023] (1) Wood pretreatment: prepare succinic anhydride and N,N-dimethylformamide according to the mass ratio of 1:4 to prepare the pretreatment modifier; first add succinic anhydride to N,N-dimethylformamide In the amide organic solvent, stir with a magnetic stirrer at a speed of 200 rpm for 20 minutes and heat to 50° C. to completely dissolve the succinic anhydride. Subsequently, a certain size of wood block was added to the solution, and the wood was treated at 70°C for 3 hours.
[0024] (2) Drying treatment: The treated wood is taken out of the reaction solution, and after cooling to room temperature, the treated material is washed with ethanol to remove unreacted succinic anhydride and residual N,-N dimethylformamide. Finally, the wood block is placed in an oven at 70°C and dried until the moisture content reaches 15%.
[0025] (3) Resin impregnated wood: Place the dried pretreated wood in an impregnating tank, and when the tank is evacuated to a negative pressure of 0.08-0.1MPa, keep it for 40 minutes; then, put the resin solution under the negative pressure Inject and fill the tank; then adjust the pressure in the tank to 0.8-1.0MPa and keep it for 100 minutes to fully inject the resin solution into the wood cell wall and cell cavity; release the pressure and take out the treated wood.
[0026] (4) Vacuum drying treatment: Put the impregnated wood in a vacuum drying tank, heat it until the wood temperature reaches 60℃, and then vacuumize the tank to -0.04--0.06MPa, and keep the temperature and vacuum in the tank State, dry the wood to 10% moisture content.

Example Embodiment

[0027] Example 2
[0028] (1) Wood pretreatment: prepare succinic anhydride and N,N-dimethylformamide according to the mass ratio of 2:5 to prepare pretreatment modifier; first add succinic anhydride to N,N-dimethylformamide In the amide organic solvent, stir with a magnetic stirrer at a speed of 300 rpm for 20 minutes and heat to 50° C. to completely dissolve the succinic anhydride. Subsequently, a certain size of wood block was added to the solution, and the wood was treated at 80°C for 4 hours.
[0029] (2) Drying treatment: The treated wood is taken out of the reaction solution, and after cooling to room temperature, the treated material is washed with ethanol to remove unreacted succinic anhydride and residual N,-N dimethylformamide. Finally, the wood block is placed in an oven at 70° C. and dried until the moisture content reaches 14%.
[0030] (3) Resin impregnated wood: Place the dried pretreated wood in an impregnating tank, and when the tank is evacuated to a negative pressure of 0.08-0.1MPa, keep it for 40 minutes; then, put the resin solution under the negative pressure Inject and fill the tank; then adjust the pressure in the tank to 0.8-1.0 MPa and keep it for 120 minutes so that the resin solution is fully injected into the wood cell wall and cell cavity; relieve the pressure and take out the treated wood.
[0031] (4) Vacuum drying treatment: Put the impregnated wood into a vacuum drying tank, heat it until the wood temperature reaches 70℃, and then vacuumize the tank to -0.04--0.06MPa, and keep the temperature and vacuum in the tank State, dry the wood to 8% moisture content.

Example Embodiment

[0032] Example 3
[0033] (1) Wood pretreatment: prepare succinic anhydride and N,N-dimethylformamide according to the mass ratio of 1:2 to prepare pretreatment modifier; first add succinic anhydride to N,N-dimethylformamide In the amide organic solvent, stir with a magnetic stirrer at a speed of 300 rpm for 20 minutes and heat to 50° C. to completely dissolve the succinic anhydride. Subsequently, a certain size of wood block was added to the solution, and the wood was treated at 90°C for 6 hours.
[0034] (2) Drying treatment: the treated wood is taken out of the reaction solution, and after cooling to room temperature, the treated material is washed with ethanol to remove unreacted succinic anhydride and residual N,N-dimethylformamide. Finally, the wood block is placed in an oven at 70° C. and dried until the moisture content reaches 13%.
[0035] (3) Resin impregnated wood: Place the dried pretreated wood in an impregnating tank, and when the tank is evacuated to a negative pressure of 0.08-0.1MPa, keep it for 40 minutes; then, put the resin solution under the negative pressure Inject and fill the tank; then adjust the pressure in the tank to 0.8-1.0 MPa and keep it for 120 minutes to fully inject the resin solution into the wood cell wall and cell cavity; release the pressure and take out the treated wood.
[0036] (4) Vacuum drying treatment: Put the impregnated wood into a vacuum drying tank, heat it until the wood temperature reaches 80℃, and then vacuumize the tank to -0.04--0.06MPa, and keep the temperature and vacuum in the tank State, dry the wood to a moisture content of 7%.

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