Surface treatment method of oil-proof, water-proof and flame-retardant wood board

Abstract

The invention discloses a surface treatment method of an oil-proof, water-proof and flame-retardant wood board, which at least comprises the following steps: I, extracting wood by adopting a resin extraction solvent to obtain oil-proof wood; iI, dipping the oil-proof wood obtained in the step I in a sodium hydroxide solution, washing, and drying I to obtain activated wood; step III, dispersing sodium alginate, montmorillonite and cyclodextrin in water to form an ionic dispersion liquid; and IV, spraying the ionic dispersion liquid obtained in the step III on the surface of the activated wood obtained in the step II, drying in the step II, and putting the activated wood dried in the step II into a solution containing trifluoroethyl methacrylate to obtain the waterproof, oil-proof and flame-retardant wood. The hydrophobicity of the wood board obtained through surface treatment is remarkably improved, and the oil-proof and flame-retardant effects are excellent.

Description

Technical Field

[0001] The present application relates to a surface treatment method for an oil-proof, waterproof and flame-retardant wood board, belonging to the technical field of wood surface treatment. Background Art

[0002] In recent years, the frequent occurrence of fires has made many people pay more attention to fire safety awareness. Especially in life, wooden products have become the mainstream of furniture products. The use of wood flame retardants can achieve the purpose of delaying the occurrence of fire.

[0003] Wood is a porous and complex natural material composed of cellulose, hemicellulose and lignin. Wood molecules contain a large number of oxygen-containing polar groups such as hydroxyl and hydroxymethyl, so they are highly hygroscopic. In addition, wood is not fully degreased in the early processing, especially some wood with high oil content, which is more prone to oil seepage. As time goes by, the surface of the wood will fade, thus affecting the appearance of the wood. The oil composition on the surface of different woods is not exactly the same. Targeted degreasing treatment methods are urgently needed for different woods, otherwise it will seriously affect the service life and appearance of the wood.

[0004] Prior art CN 115972329 A discloses a surface treatment process for flame-retardant wood boards. This method uses montmorillonite as a flame retardant. Although this method has a significant flame retardant effect, its mechanical properties are significantly reduced. Since this method does not perform targeted degreasing treatment on the wood board to solve the problem of oil on the wood surface, its mechanical properties are greatly reduced. In this regard, a surface treatment method for oil-proof, waterproof and flame-retardant wood boards is provided. Summary of the invention

[0005] In order to solve the above problems, the present application provides a surface treatment method for oil-proof, waterproof and flame-retardant wood boards. The present application uses a resin extraction solvent to degrease the wood to reduce the grease on the wood surface, and then dehydrates the wood to form an oil-proof and waterproof coating to improve the flame retardancy and oil-proof and waterproof properties of the wood board.

[0006] According to one aspect of the present application, a surface treatment method for an oil-proof, waterproof and flame-retardant wood board is provided, comprising at least the following steps:

[0007] Step I: extracting the wood with a resin extraction solvent to obtain oil-proof wood;

[0008] Step II: immersing the oil-proof wood obtained in step I in a sodium hydroxide solution, washing, and drying I to obtain activated wood;

[0009] Step III: dispersing sodium alginate, montmorillonite and cyclodextrin in water to form an ionic dispersion;

[0010] Step IV: spray the ion dispersion obtained in step III onto the surface of the activated wood obtained in step II, dry II, and place the activated wood after drying II in a solution containing trifluoroethyl methacrylate to obtain waterproof, oil-proof and flame-retardant wood.

[0011] Optionally, the resin extraction solvent is selected from at least one of petroleum ether, methyl isobutyl ketone and ethanol.

[0012] Optionally, the extraction temperature is 80-100°C.

[0013] Optionally, the extraction temperature is independently selected from any value of 80°C, 82°C, 84°C, 86°C, 88°C, 90°C, 92°C, 94°C, 96°C, 98°C, 100°C or a range between any two of the above points.

[0014] Optionally, the mass ratio of the resin extraction solvent to the wood is 5:1 to 10:1.

[0015] Optionally, the mass ratio of the resin extraction solvent to the wood is independently selected from any value of 5:1, 6:1, 7:1, 8:1, 9:1, 10:1 or a range between any two of the above points.

[0016] Optionally, the concentration of the sodium hydroxide solution is 1 to 3 mol / L.

[0017] Optionally, the concentration of the sodium hydroxide solution is independently selected from any value of 1.0mol / L, 1.2mol / L, 1.4mol / L, 1.6mol / L, 1.8mol / L, 2.0mol / L, 2.2mol / L, 2.4mol / L, 2.6mol / L, 2.8mol / L, 3.0mol / L or a range value between any two of the above points.

[0018] Optionally, the drying temperature I is 80-100°C.

[0019] Optionally, the drying temperature I is any value of 80°C, 82°C, 84°C, 86°C, 88°C, 90°C, 92°C, 94°C, 96°C, 98°C, 100°C, or a range between any two of the above points.

[0020] Optionally, the drying time I is 8 to 12 hours.

[0021] Optionally, the mass ratio of the sodium alginate, montmorillonite and cyclodextrin is 1-4:1-4:1-5.

[0022] Optionally, the concentration of sodium alginate in the ion dispersion is 0.1-4.0 mol / L.

[0023] Optionally, the concentration of sodium alginate in the ionic dispersion is any value of 0.1 mol / L, 0.5 mol / L, 1.0 mol / L, 1.5 mol / L, 2.0 mol / L, 2.5 mol / L, 3.0 mol / L, 3.5 mol / L, 4.0 mol / L, or a range between any two of the above points.

[0024] Optionally, the drying temperature of II is 90-110°C;

[0025] The drying time II is 8 to 12 hours.

[0026] The beneficial effects of this application include:

[0027] 1) The surface treatment method provided in the present application, the wood used in the present application is of a type with a high level of surface lipid compounds, and the traditional degreasing method has a poor removal effect. First, the present application uses a fat-soluble organic solvent to degrease the wood multiple times. After the degreasing treatment, the compounds in the wood are not easy to be functionalized because they do not contain the active groups in the lipid compounds. At the same time, an oil-resistant coating is formed on the surface, and then an activation treatment is performed to activate the hydroxyl groups in the wood, making it easy to undergo a cross-linking reaction with a cross-linking agent.

[0028] 2) The surface treatment method provided in the present application can greatly improve the fire resistance of the wood obtained compared with the existing wood. Since it forms a dense oil-resistant coating that is not easy to burn, it is more suitable for kitchen cooking utensils.

[0029] 3) The surface treatment method provided in the present application undergoes a degreasing and reactivation process. Since the ion dispersion is doped with cyclodextrin, the wood has more hydroxyl active functional groups. The hydroxyl groups of cyclodextrin are activated by sodium alginate to cause a cross-linking reaction between the cyclodextrin and the cellulose in the wood. The cyclodextrin is then reacted with trifluoroethyl methacrylate to enhance the flame retardancy and mechanical properties. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution, the present invention is described in detail below in conjunction with embodiments. The description in this section is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0031] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0032] Unless otherwise specified, the raw materials and reagents in the examples of this application were purchased through commercial channels.

[0033] Example 1

[0034] At a temperature of 90°C and a pressure of 500 MPa, 5 g of red sandalwood residue was dispersed in 20 mL of petroleum ether for degreasing. After degreasing for 45 minutes, the residue was treated with a solvent again. After three treatments, the solvent on the surface of the residue was removed by rotary evaporation. The solvent-free residue was placed in an oven and dried at 80°C for 12 hours to obtain oil-proof wood residue.

[0035] 3 g of the obtained oil-proof wood residue was dissolved in 15 mL of 3 mol / L sodium hydroxide solution for activation for 20 min, washed with water three times, and dried at 80° C. for 12 h to obtain activated oil-proof wood residue.

[0036] 1 mol of sodium alginate, 1.5 mol of montmorillonite and 2 mol of cyclodextrin were dissolved in 100 mL of water to obtain an ion mixture, the mixture was sprayed on the surface of activated oil-proof wood residues, dried at 90°C for 10 h, and finally the dried activated oil-proof wood residues were immersed in 10 mL of 2 mol / L trifluoroethyl methacrylate solution to obtain waterproof, oil-proof and flame-retardant wood residues. A small amount of waterproof, oil-proof and flame-retardant wood residues was taken for combustion experiment, burned at 500°C, and the solid content remained 90%. The limiting oxygen index of the oil-proof, waterproof and flame-retardant wood residues was 40OI%, and the water absorption (60s) was 15 g / m 2 , oil resistance grade 7.5, and curvature strength of 35MPa.

[0037] Example 2

[0038] At a temperature of 90°C and a pressure of 550MPa, 5g of ebony residue was dispersed in 20mL of methyl isobutyl ketone for degreasing. After degreasing for 60 minutes, the residue was treated with a solvent again. After three treatments, the solvent on the surface of the residue was removed by rotary evaporation. The solvent-free residue was placed in an oven and dried at 90°C for 10 hours to obtain oil-proof wood residue.

[0039] 3 g of the obtained oil-proof wood residue was dissolved in 15 mL of 3 mol / L sodium hydroxide solution for activation for 20 min, washed with water three times, and dried at 80° C. for 12 h to obtain activated oil-proof wood residue.

[0040] 2 mol of sodium alginate, 3 mol of montmorillonite and 2 mol of cyclodextrin were dissolved in 100 mL of water to obtain an ion mixture, which was sprayed on the surface of activated oil-proof wood residues and dried at 95°C for 10 h. Finally, the dried activated oil-proof wood residues were immersed in 10 mL of 2 mol / L trifluoroethyl methacrylate solution to obtain waterproof, oil-proof and flame-retardant wood residues. A small amount of waterproof, oil-proof and flame-retardant wood residues was taken for combustion experiment. When burned at 550°C, the solid content remained 85%. The limiting oxygen index of the oil-proof, waterproof and flame-retardant wood residues was 35OI%, the water contact angle was 140°, and the water absorption (60s) was 20 g / m 2, oil resistance grade 8.5, and curvature strength of 30MPa.

[0041] Example 3

[0042] At a temperature of 100°C and a pressure of 600 MPa, 5 g of chicken wing wood residue was dispersed in 20 mL of ethanol for degreasing. After degreasing for 70 minutes, the residue was treated with a solvent again. After three treatments, the solvent on the surface of the residue was removed by rotary evaporation. The solvent-free residue was placed in an oven and dried at 100°C for 8 hours to obtain oil-proof wood residue.

[0043] 3 g of the obtained oil-proof wood residue was dissolved in 15 mL of 3 mol / L sodium hydroxide solution for activation for 20 min, washed with water three times, and dried at 80° C. for 12 h to obtain activated oil-proof wood residue.

[0044] 2 mol of sodium alginate, 5 mol of montmorillonite and 3 mol of cyclodextrin were dissolved in 100 mL of water to obtain an ion mixture, the mixture was sprayed on the surface of activated oil-proof wood residues, dried at 100°C for 10 h, and finally the dried activated oil-proof wood residues were immersed in 10 mL of 2 mol / L trifluoroethyl methacrylate solution to obtain waterproof, oil-proof and flame-retardant wood residues. A small amount of waterproof, oil-proof and flame-retardant wood residues was taken for combustion experiment, burned at 600°C, and the solid content remained 80%. The limiting oxygen index of the oil-proof, waterproof and flame-retardant wood residues was 60OI%, and the water absorption (60s) was 25 g / m 2 , oil resistance grade 7.5, and curvature strength of 38MPa.

[0045] Comparative Example 1

[0046] 5 g of Wenge wood residue was dissolved in 15 mL of 3 mol / L sodium hydroxide solution for activation for 20 min, washed with water three times, and dried at 80°C for 12 h to obtain activated wood residue.

[0047] 2 mol of sodium alginate, 5 mol of montmorillonite and 3 mol of cyclodextrin were dissolved in 100 mL of water to obtain an ion mixture, the mixture was sprayed on the surface of activated wood residues, dried at 100°C for 10 h, and finally the dried activated wood residues were immersed in 10 mL of 2 mol / L trifluoroethyl methacrylate solution to obtain waterproof and flame-retardant wood residues. A small amount of waterproof and flame-retardant wood residues was taken for combustion experiment. When burned at 500°C, the solid content remained 60%. The limiting oxygen index of the waterproof and flame-retardant wood residues was 10OI%, and the water absorption (60s) was 50 g / m 2 , oil resistance level 4, and curvature strength of 18MPa.

[0048] It should be noted that, in this article, the terms: include, contain and any other variants are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Specific examples are used in this article to illustrate the principle and implementation of the technical solution of the present invention. The above examples are only used to help understand the method of the present invention and its core idea. The above is only a preferred implementation of the present invention. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements, modifications or changes can be made, and the above technical features can also be combined in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the concept and technical solution of the present invention to other occasions without improvement, should be regarded as the protection scope of the present invention.

Claims

1. A surface treatment method for an oil-proof, waterproof and flame-retardant board, characterized in that: At least the following steps are included: Step I: extracting the wood with a resin extraction solvent to obtain oil-proof wood; Step II: immersing the oil-proof wood obtained in step I in a sodium hydroxide solution, washing, and drying I to obtain activated wood; Step III: dispersing sodium alginate, montmorillonite and cyclodextrin in water to form an ionic dispersion; Step IV: spray the ion dispersion obtained in step III onto the surface of the activated wood obtained in step II, dry II, and place the activated wood after drying II in a solution containing trifluoroethyl methacrylate to obtain waterproof, oil-proof and flame-retardant wood.

2. The surface treatment method according to claim 1, characterized in that: The resin extraction solvent is selected from at least one of petroleum ether, methyl isobutyl ketone and ethanol.

3. The surface treatment method according to claim 1, characterized in that: The extraction temperature is 80-100°C.

4. The surface treatment method according to claim 1, characterized in that: The mass ratio of the resin extraction solvent to the wood is 5:1 to 10:

1.

5. The surface treatment method according to claim 1, characterized in that: The concentration of the sodium hydroxide solution is 1-3 mol / L.

6. The surface treatment method according to claim 1, characterized in that: The temperature of the drying I is 80-100°C.

7. The surface treatment method according to claim 1, characterized in that: The drying time is 8 to 12 hours.

8. The surface treatment method according to claim 1, characterized in that: The mass ratio of the sodium alginate, montmorillonite and cyclodextrin is 1-4:1-4:1-5.

9. The surface treatment method according to claim 1, characterized in that: The concentration of sodium alginate in the ion dispersion is 0.1-4 mol / L.

10. The surface treatment method according to claim 1, characterized in that: The drying temperature of II is 90-110°C; The drying time II is 8 to 12 hours.