A preparation method of a high-efficiency catalytic decomposition wood-based panel for formaldehyde

Abstract

The present invention discloses a preparation method of a wood-based panel for highly efficient catalytic decomposition of formaldehyde, comprising the following steps: S1, preparing the inner layer: preparing an SnO·SnO2 inner layer solution by using SnCl4·5H2O and SnCl2·2H2O; S2, preparing the wood-based panel: uniformly applying glue on the bonding surface of a single sheet of board, and uniformly spraying the inner layer solution on its exterior, then bonding the boards and performing pre-pressing and hot-pressing to form a wood-based panel; S3, preparing the surface layer: mixing polycarbonate, a dripping inhibitor, an organic resin and a light diffusing agent to prepare a light-transmitting coating solution; wherein, by weight fraction, the polycarbonate is 50 to 100 parts, the dripping inhibitor is 0.15 to 0.3 part, the organic resin is 10 to 20 parts, and the light diffusing agent is 2 to 4.5 parts; S4, coating and wrapping the wood-based panel: uniformly coating the light-transmitting coating on the surface of the wood-based panel, and drying and hot-pressing the wood-based panel coated with the light-transmitting coating to obtain a wood-based panel for highly efficient catalytic decomposition of formaldehyde. By combining the SnO·SnO2 inner layer with the light-transmitting coating, the present invention greatly improves the catalytic decomposition efficiency of formaldehyde.

Description

Technical Field

[0001] The present invention relates to the technical field of wood-based panel manufacturing, and in particular to a preparation method of a wood-based panel with efficient catalytic decomposition of formaldehyde. Background Art

[0002] Wood-based panels are made from wood or other non-wood plants. After being mechanically processed into various unit materials, they are glued with or without adhesives and other additives to form panels or molded products, and are widely used in indoor decoration, furniture manufacturing, construction, vehicle and ship manufacturing, floor covering materials, the electronics industry and other fields. At present, the production and sales volume of wood-based panels in China ranks second in the world.

[0003] The widespread use of wood-based panels in indoor decoration can easily lead to excessive formaldehyde in indoor air. The main sources of formaldehyde in wood-based panels are: unreacted formaldehyde in the gluing process, resulting in residual free formaldehyde in the wood-based panels; formaldehyde release during the production process of wood-based panels; and during the stacking and use of wood-based panels, a small amount of formaldehyde is slowly released due to the aging of the glue layer.

[0004] In the prior art, a coating made of 15% paraffin and ethylene oxide is usually applied to the surface and around the particleboard to seal it, which can reduce the emission rate of free formaldehyde and reduce the amount of formaldehyde emitted per unit time.

[0005] Although the application of paraffin and ethylene oxide in the coating can reduce the emission of formaldehyde, the safety of these two substances themselves also needs to be considered. Paraffin is a petroleum product, and ethylene oxide is a toxic chemical. Long-term contact or inhalation may affect human health. And although the coating can reduce the emission rate of formaldehyde, it cannot completely prevent the release of formaldehyde, because formaldehyde is a decomposition product of glue and other additives in the particleboard, and these substances will continuously release formaldehyde, only reducing the release rate of formaldehyde and unable to effectively remove formaldehyde. Summary of the Invention

[0006] The present invention overcomes the deficiencies of the prior art and provides a preparation method of a wood-based panel with efficient catalytic decomposition of formaldehyde.

[0007] To achieve the above object, the technical solution adopted by the present invention is: a preparation method of a wood-based panel with efficient catalytic decomposition of formaldehyde, comprising the following steps:

[0008] S1. Prepare the inner layer: Prepare a SnO·SnO2 inner layer solution from SnCl4·5H2O and SnCl2·2H2O;

[0009] S2. Prepare the wood-based panel: Apply glue evenly on the bonding surface of a single sheet of board, and evenly spray the inner layer solution on its outside, then bond the boards and perform pre-pressing and hot-pressing to form a wood-based panel;

[0010] S3. Preparation of the surface layer: Mix polycarbonate, a dripping inhibitor, an organic resin, and a light diffusing agent to prepare a light-transmitting coating solution; wherein, by weight fraction, the polycarbonate is 50 to 100 parts, the dripping inhibitor is 0.15 to 0.3 parts, the organic resin is 10 to 20 parts, and the light diffusing agent is 2 to 4.5 parts;

[0011] S4. Coating the artificial board: Uniformly coat the light-transmitting coating on the surface of the artificial board, and dry and hot press the artificial board coated with the light-transmitting coating to obtain an artificial board with efficient formaldehyde catalytic decomposition.

[0012] In a preferred embodiment of the present invention, in the step S1, the specific steps for preparing the SnO·SnO2 inner layer solution are as follows:

[0013] S11. At room temperature, mix SnCl4·5H2O and SnCl2·2H2O with a mass ratio of 1 to 1.25:1, dissolve them in deionized water, add ethanol, slowly dropwise add concentrated ammonia water, and stir for 30 to 40 minutes;

[0014] S12. Transfer the solution to a high-pressure hydrothermal reaction kettle, and place it in an oven to react at a temperature of 150 to 200 °C for 12 to 14 hours;

[0015] S13. After the reaction is completed, naturally cool to room temperature, and wash 5 to 7 times with deionized water and absolute ethanol to obtain the SnO·SnO2 inner layer solution.

[0016] In a preferred embodiment of the present invention, in the step S11, the volume-mass ratio of deionized water, ethanol, and concentrated ammonia water is 2.5 to 3:3.5 to 4.5:1.

[0017] In a preferred embodiment of the present invention, in the step S2, the specific steps for pre-pressing and hot-pressing to form the artificial board are as follows:

[0018] S21. Continuously pre-press the artificial board with a drum-type pre-presser under the pressure condition of 18 to 30 °C and 250 to 300 kN / m 2 of pressure;

[0019] S22. Feed the pre-pressed artificial board into a multi-layer hot-presser, and hot-press it for 6 to 12 minutes under the conditions of a hot-pressing pressure of 1.0 to 1.6 MPa and a hot-pressing temperature of 120 to 150 °C to form the artificial board.

[0020] In a preferred embodiment of the present invention, in the step S2, it further includes that the gluing pressure is 90 to 115 N when uniformly applying glue to the bonding surface of a single artificial board.

[0021] In a preferred embodiment of the present invention, in the step S3, the specific steps for preparing the light-transmitting coating solution are as follows:

[0022] S31. Place polycarbonate, a dripping inhibitor, an organic resin, and a light diffusing agent in a high-speed mixer and stir at a speed of 560 - 610 r / min for 4 - 8 min to complete mixing.

[0023] S32. After preliminary mixing, naturally cool to room temperature and wash 2 - 3 times with deionized water to obtain a light-transmitting coating solution.

[0024] In a preferred embodiment of the present invention, in the step S3, the dripping inhibitor is one of polytetrafluoroethylene dripping inhibitor, coated dripping inhibitor, or pure powder type dripping inhibitor.

[0025] In a preferred embodiment of the present invention, in the step S4, the coating thickness is 10 - 50 μm, and the coating amount of the light-transmitting coating is 50 - 250 g / m 2 , and the coating methods include brushing, scraping, air spraying, curtain coating, and roll coating.

[0026] In a preferred embodiment of the present invention, in the step S4, when drying the wood-based panel, the pre-curing degree of the light-transmitting coating reaches 60 - 85%.

[0027] In a preferred embodiment of the present invention, in the step S4, when hot pressing the wood-based panel, the hot pressing pressure is 0.65 - 0.89 MPa, the hot pressing temperature is 167 - 185 °C, and the hot pressing time is 20 - 600 s.

[0028] The present invention solves the defects in the background technology and has the following beneficial effects:

[0029] (1) The present invention provides a preparation method for a wood-based panel with high-efficiency catalytic decomposition of formaldehyde. By preparing the inner layer of SnO·SnO2 to play a catalytic role, it effectively catalyzes and decomposes the formaldehyde generated on the surface of the wood-based panel, and a light-transmitting coating is set to wrap the whole wood-based panel, which can not only protect the wood-based panel, but also make the inner layer combine more closely with the wood-based panel, thus better decomposing formaldehyde and greatly improving the formaldehyde catalytic decomposition efficiency.

[0030] (2) The present invention evenly sprays the inner layer of SnO·SnO2 on the bonding surface and the outside of the wood-based panel, which can continue to play its catalytic role after the wood-based panel is cured, help decompose the formaldehyde released from the wood-based panel materials, and covering the bonding surface can prevent the formaldehyde from diffusing and releasing from the inside of the wood-based panel to the outside, directly treating at the possible release source, and more effectively controlling the formaldehyde concentration.

[0031] (3) The present invention enables the catalyst to be more evenly distributed on the entire surface of the wood-based panel. Compared with only coating the surface of the wood-based panel with a coating, adding an inner layer can make the catalyst adhere more firmly to the wood-based panel and not easily fall off, and the catalytic effect is more stable; moreover, the inner layer is tightly combined with the wood-based panel, and the catalyst remains on the surface of the wood-based panel for a long time, and can continuously play a catalytic role, thereby efficiently degrading formaldehyde generated on the surface of the wood-based panel for a long time.

[0032] (4) The present invention adds an organic resin to the light-transmitting coating, which can improve the mechanical strength of the coating and further enhance the performance of the wood-based panel; adding a light diffusing agent can improve the optical properties of the coating, make the surface of the wood-based panel more flat and smooth, not easily generate problems such as light spots that affect the use, improve the light transmittance, and enhance the formaldehyde elimination rate.

[0033] (5) The present invention combines the SnO·SnO2 inner layer with the light-transmitting coating. Under the excitation of light (especially ultraviolet light), the SnO·SnO2 inner layer can generate active substances such as holes, hydroxyl groups, and superoxide radicals with strong oxidation ability, and these active substances can oxidize and decompose formaldehyde, thereby purifying the indoor air. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0035] Figure 1 It is a flowchart of a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] As Figure 1 shown, a preparation method of a wood-based panel for highly efficient catalytic decomposition of formaldehyde includes the following steps:

[0038] S1. Prepare the inner layer: Prepare a SnO·SnO2 inner layer solution through SnCl4·5H2O and SnCl2·2H2O.

[0039] In S1, the specific steps for preparing the SnO·SnO2 inner layer solution are as follows:

[0040] S11. At room temperature, mix SnCl4·5H2O and SnCl2·2H2O with a mass ratio of 1 - 1.25:1, dissolve them in deionized water, add ethanol, slowly drip concentrated ammonia water, and stir for 30 - 40 min;

[0041] S12. Transfer the solution to a high-pressure hydrothermal reaction kettle and place it in an oven to react at a temperature of 150 - 200 °C for 12 - 14 h;

[0042] S13. After the reaction is completed, naturally cool it to room temperature, and wash it 5 - 7 times with deionized water and absolute ethanol to obtain the inner layer solution of SnO·SnO2.

[0043] In S11, the volume-mass ratio of deionized water, ethanol, and concentrated ammonia water is 2.5 - 3:3.5 - 4.5:1.

[0044] In S12, the high-pressure hydrothermal reaction kettle used is a polytetrafluoroethylene lining.

[0045] S2. Prepare the artificial board: Apply glue evenly on the bonding surface of a single piece of board, spray the inner layer solution evenly on its outside, then bond the boards and perform pre-pressing and hot-pressing to form the artificial board.

[0046] In S2, the specific steps for performing pre-pressing and hot-pressing to form the artificial board are as follows:

[0047] S21. Continuously pre-press the artificial board with a roller pre-presser under the pressure condition of 18 - 30 °C and 250 - 300 kN / m 2 ;

[0048] S22. Send the pre-pressed artificial board into a multi-layer hot-presser and hot-press it for 6 - 12 min under the conditions of a hot-pressing pressure of 1.0 - 1.6 MPa and a hot-pressing temperature of 120 - 150 °C to form the artificial board.

[0049] In S2, the adhesive used is one of urea-formaldehyde resin glue, phenolic resin glue, or melamine glue.

[0050] In S2, it also includes that the glue application pressure is 90 - 115 N when applying glue evenly on the bonding surface of a single piece of artificial board.

[0051] This step evenly sprays the inner layer of SnO·SnO2 on the bonding surface and the outside of the artificial board, which can make the catalyst more evenly distributed on the entire surface of the artificial board. Compared with only coating the paint on the surface of the artificial board, adding the inner layer can make the catalyst more firmly adhered to the artificial board and not easy to fall off, and the catalytic effect is more stable; and the inner layer is tightly combined with the artificial board, and the catalyst can be kept on the surface of the artificial board for a long time, which can continuously play a catalytic role, so as to efficiently degrade the formaldehyde generated on the surface of the artificial board for a long time.

[0052] S3. Preparation of the surface layer: Mix polycarbonate, a dripping inhibitor, an organic resin, and a light diffusing agent to prepare a light-transmitting coating solution; by weight fraction, the polycarbonate is 50 - 100 parts, the dripping inhibitor is 0.15 - 0.3 parts, the organic resin is 10 - 20 parts, and the light diffusing agent is 2 - 4.5 parts.

[0053] In S3, the specific steps for preparing the light-transmitting coating solution are as follows:

[0054] S31. Place the polycarbonate, the dripping inhibitor, the organic resin, and the light diffusing agent in a high-speed mixer, and stir at a speed of 560 - 610 r / min for 4 - 8 min to complete the mixing;

[0055] S32. After preliminary mixing, naturally cool to room temperature, and wash with deionized water 2 - 3 times to obtain the light-transmitting coating solution.

[0056] In S3, the dripping inhibitor is one of a polytetrafluoroethylene dripping inhibitor, a coated dripping inhibitor, or a pure powder type dripping inhibitor.

[0057] In S3, the organic resin is an epoxy resin.

[0058] In S3, the light diffusing agent is an organosilicon light diffusing agent. The organosilicon light diffusing agent is a special organic material composed of polymer microspheres with a three-dimensional network structure formed by silicon-oxygen bonds. This light diffusing agent appears as a white powder. When it is incorporated into various resin materials, it will be evenly dispersed into tiny transparent spherical particles. These particles use a refractive index different from that of the substrate to change the propagation path of light through refraction, thereby achieving uniform distribution of light while maintaining the light transmittance of the material.

[0059] Adding the organic resin to this step in the light-transmitting coating can improve the mechanical strength of the coating and further enhance the performance of the artificial board; adding the light diffusing agent can improve the optical properties of the coating, making the surface of the artificial board smoother and flatter, less likely to produce problems such as light spots that affect use, increasing the light transmittance, and enhancing the formaldehyde elimination rate.

[0060] S4. Coating the artificial board: Uniformly coat the light-transmitting coating on the surface of the artificial board, and dry and hot-press the artificial board coated with the light-transmitting coating to obtain an artificial board with high-efficiency catalytic decomposition of formaldehyde.

[0061] In S4, the coating thickness is 10 - 50 μm, and the coating amount of the light-transmitting coating is 50 - 250 g / m 2 , and the coating methods include brushing, scraping, air spraying, curtain coating, and roll coating.

[0062] In S4, when drying the artificial board, the pre-curing degree of the light-transmitting coating is made to reach 60 - 85%.

[0063] In S4, when hot-pressing the wood-based panel, the hot-pressing pressure is 0.65 - 0.89 MPa, the hot-pressing temperature is 167 - 185 °C, and the hot-pressing time is 20 - 600 s.

[0064] The present invention combines the inner layer of SnO·SnO2 with the light-transmitting coating. Under the excitation of light (especially ultraviolet light), the inner layer of SnO·SnO2 can generate active substances such as holes, hydroxyl groups, and superoxide free radicals with strong oxidation ability. These active substances can oxidize and decompose formaldehyde, thereby purifying the indoor air.

[0065] Example 1

[0066] This example provides a preparation method for a wood-based panel with high-efficiency catalytic decomposition of formaldehyde, specifically including the following steps:

[0067] S1. Preparation of the inner layer: At room temperature, mix SnCl4·5H2O and SnCl2·2H2O with a mass ratio of 1:1, dissolve them in deionized water and add ethanol, slowly dropwise add concentrated ammonia water, and stir for 30 min; transfer the solution to a high-pressure hydrothermal reaction kettle with a polytetrafluoroethylene liner and place it in an oven to react at 150 °C for 12 h; the volume-mass ratio of deionized water, ethanol, and concentrated ammonia water is 2.5:3.5:1;

[0068] After the reaction is completed, naturally cool to room temperature and wash 5 times with deionized water and absolute ethanol to obtain the SnO·SnO2 inner layer solution.

[0069] S2. Preparation of the wood-based panel: Uniformly apply phenolic resin glue on the bonding surface of the single-piece board, the application pressure is 90 - 115 N, and uniformly spray the inner layer solution on its outside, then bond the boards, and continuously pre-press the wood-based panel with a roller pre-presser under the pressure condition of 18 °C and 250 kN / m2;

[0070] Send the pre-pressed wood-based panel into a multi-layer hot-press and hot-press for 6 min under the conditions of a hot-pressing pressure of 1.0 MPa and a hot-pressing temperature of 120 °C to form a wood-based panel.

[0071] S3. Preparation of the surface layer: Place 50 parts of polycarbonate, 0.15 parts of polytetrafluoroethylene anti-dripping agent, 10 parts of epoxy resin, and 2 parts of silicone light diffusing agent in a high-speed mixer and stir at a speed of 560 r / min for 4 min to complete the mixing; after preliminary mixing, naturally cool to room temperature and wash 2 times with deionized water to obtain the light-transmitting coating solution.

[0072] S4. Coating the wood-based panel: Uniformly coat the light-transmitting coating on the surface of the wood-based panel by air spraying method, the coating thickness is 10 μm, and the coating amount is 50 g / m 2Then, the wood-based panel coated with the light-transmitting coating is dried to make the pre-curing degree of the light-transmitting coating reach 60%, and the wood-based panel is hot-pressed. The hot-pressing pressure is 0.65 MPa, the hot-pressing temperature is 167 °C, and the hot-pressing time is 20 s to obtain a wood-based panel with high-efficiency catalytic decomposition of formaldehyde.

[0073] Example Two

[0074] This example provides a preparation method of a wood-based panel with high-efficiency catalytic decomposition of formaldehyde. The same parts as those in Example One will not be described in detail. The difference between this example and Example One lies in:

[0075] In step S1, the steps for preparing the inner layer are as follows: at room temperature, SnCl4·5H2O and SnCl2·2H2O with a mass ratio of 1.25:1 are mixed, dissolved in deionized water and ethanol is added, concentrated ammonia water is slowly added dropwise, and stirred for 40 min; the solution is transferred to a high-pressure hydrothermal reaction kettle with a polytetrafluoroethylene lining and placed in an oven to react at 200 °C for 14 h; wherein, the volume-mass ratio of deionized water, ethanol and concentrated ammonia water is 3:

[0076] 4.5:1; after the reaction is completed, it is naturally cooled to room temperature and washed 7 times with deionized water and absolute ethanol to obtain a SnO·SnO2 inner layer solution.

[0077] In step S2, the steps for preparing the wood-based panel are as follows: phenolic resin glue is evenly applied to the bonding surface of a single sheet of board under a pressure of 115 N, and the inner layer solution is evenly sprayed on its outside, then the boards are bonded, and the wood-based panel is continuously pre-pressed by a drum-type pre-press under a pressure condition of 30 °C and 300 kN / m 2 ;

[0078] The pre-pressed wood-based panel is sent to a multi-layer hot press and hot-pressed for 12 min under the conditions of a hot-pressing pressure of 1.6 MPa and a hot-pressing temperature of 150 °C to form a wood-based panel.

[0079] In step S3, the steps for preparing the surface layer are as follows: 100 parts of polycarbonate, 0.3 part of polytetrafluoroethylene anti-dripping agent, 20 parts of epoxy resin and 4.5 parts of silicone light diffusing agent are placed in a high-speed mixer and stirred at a speed of 610 r / min for 8 min to complete the mixing; wherein, the anti-dripping agent is a polytetrafluoroethylene anti-dripping agent. After preliminary mixing, it is naturally cooled to room temperature and washed 3 times with deionized water to obtain a light-transmitting coating solution.

[0080] S4. The steps for coating the wood-based panel are as follows: the light-transmitting coating is evenly coated on the surface of the wood-based panel by air spraying method, the coating thickness is 50 μm, and the coating amount of the light-transmitting coating is 250 g / m 2, and dry the wood-based panel coated with the light-transmitting coating to make the pre-curing degree of the light-transmitting coating reach 85%, and then hot-press the wood-based panel. The hot-pressing pressure is 0.89 MPa, the hot-pressing temperature is 185 °C, and the hot-pressing time is 600 s to obtain a wood-based panel with high-efficiency formaldehyde catalytic decomposition.

[0081] Example Three

[0082] This example provides a preparation method of a wood-based panel with high-efficiency formaldehyde catalytic decomposition. The same parts as in Example One will not be described in detail. The difference between this example and Example One is as follows:

[0083] In step S4, the coating thickness is 20 μm.

[0084] Example Four

[0085] This example provides a preparation method of a wood-based panel with high-efficiency formaldehyde catalytic decomposition. The same parts as in Example One will not be described in detail. The difference between this example and Example One is as follows:

[0086] In step S4, the coating thickness is 30 μm.

[0087] Example Five

[0088] This example provides a preparation method of a wood-based panel with high-efficiency formaldehyde catalytic decomposition. The same parts as in Example One will not be described in detail. The difference between this example and Example One is as follows:

[0089] In step S4, the coating thickness is 40 μm.

[0090] Comparative Example One

[0091] This comparative example provides a preparation method of a wood-based panel with high-efficiency formaldehyde catalytic decomposition. The same parts as in Example One will not be described in detail. The difference between this comparative example and Example One is as follows:

[0092] In this comparative example, phenol-formaldehyde resin glue is directly used to evenly apply glue on the bonding surface of a single sheet of board, and the boards are bonded. After continuous pre-pressing and hot-pressing of the wood-based panel, a wood-based panel is formed.

[0093] Comparative Example Two

[0094] This comparative example provides a preparation method of a wood-based panel with high-efficiency formaldehyde catalytic decomposition. The same parts as in Example One will not be described in detail. The difference between this comparative example and Example One is as follows:

[0095] In this comparative example, the light-transmitting coating step is cancelled. After evenly applying glue on the bonding surface of a single sheet of board and evenly spraying the inner layer solution on its outside, the boards are bonded and pre-pressed and hot-pressed directly to form a wood-based panel with high-efficiency formaldehyde catalytic decomposition.

[0096] Test Example One

[0097] In this test example, the wood-based panels prepared in Examples 1 to 5 and Comparative Examples 1 to 2 were randomly selected and placed in a 1 m³ experimental chamber. They were irradiated with an ultraviolet lamp with a wavelength of 300 nm and a fluorescent lamp with a wavelength of 500 nm for 6 h, 12 h, and 24 h respectively for testing. The formaldehyde concentration was detected with reference to JC / T 1074-2008, and the summarized data are shown in Table 1.

[0098] Table 1 Influence of formaldehyde release amount under different light-transmitting coating thicknesses

[0099]

[0100] Analysis of the above data shows that there are differences between the example group and the comparative example group in terms of light-transmitting coating thickness and formaldehyde release amount. The coating thickness of the example group is between 10 - 50 μm, and the formaldehyde release amount is between 0.002 - 0.016 mg / m³, which is lower than that of the comparative example group.

[0101] The coating thickness of Comparative Example 1 is 10 μm, but SnO·SnO2 inner layer for formaldehyde elimination was not set in Comparative Example 1, resulting in a higher formaldehyde release amount than that of Example 1, indicating that the SnO·SnO2 inner layer material used in Example 1 can effectively reduce formaldehyde release; while Comparative Example 2 has no light-transmitting coating, and its formaldehyde release amount is also higher than that of the example group.

[0102] In summary, the optimal coating thickness of the light-transmitting coating is 30 μm, and the SnO·SnO2 inner layer material can effectively reduce formaldehyde release.

[0103] Test Example 2

[0104] In this test example, the wood-based panels prepared in Examples 1 to 5 and Comparative Example 2 were randomly selected, and physical and chemical property tests were carried out in accordance with GB / T4897-2015. The test results are shown in Table 2 below.

[0105] Thickness (mm) <![CDATA[Density (g / cm 3 )]]> Surface bonding strength (MPa) Modulus of rupture (MPa) Example 1 25.8 0.58 1.375 53.75 Example 2 26.7 0.89 2.341 62.32 Example 3 26.1 0.61 1.539 55.13 Example 4 26.3 0.67 1.692 58.63 Example 5 26.5 0.75 1.938 60.09 Comparative Example 2 25.5 0.48 1.370 52.69

[0106] Analysis of the above data shows that the performance parameters of Examples 1 to 5 are all higher than those of Comparative Example 2. And with the increase in thickness and density, the surface bonding strength also increases, indicating that with the increase in the thickness of the anti-light-transmitting surface layer, the performance of the wood-based panel gradually improves. A higher density means that the internal structure of the wood-based panel is more compact, thus improving its mechanical properties.

[0107] Based on the ideal embodiments of the present invention as inspiration, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing a formaldehyde efficient catalytic decomposition artificial board, characterized in that: The following steps are involved: S1. Preparation of inner layer: Prepare SnO·SnO2 inner layer solution by SnCl4·5H2O and SnCl2·2H2O; the specific steps are: S11. At room temperature, mix SnCl4·5H2O and SnCl2·2H2O in a mass ratio of 1 to 1.25:1, dissolve in deionized water, add ethanol, slowly drop concentrated ammonia water, and stir for 30 to 40 minutes, wherein the volume mass ratio of deionized water, ethanol and concentrated ammonia water is 2.5 to 3:3.5 to 4.5:1; S12, transferring the solution to a high-pressure hydrothermal reactor, and placing it in an oven at 150-200° C. to react for 12-14 hours; S13, after the reaction is completed, the mixture is naturally cooled to room temperature, and washed with deionized water and anhydrous ethanol for 5 to 7 times to obtain a SnO·SnO2 inner layer solution; S2, preparing the artificial board: applying glue evenly on the bonding surface of the single board, and spraying the inner layer solution evenly on the outside, then bonding the boards and performing pre-pressing and hot pressing to form the artificial board; S3, preparing the surface layer: mixing polycarbonate, an anti-dripping agent, an organic resin and a light diffusing agent to prepare a light-transmitting coating solution, the specific steps are as follows: S31, placing polycarbonate, anti-dripping agent, organic resin and light diffusing agent in a high stirring pot, stirring at a speed of 560-610 r / min for 4-8 minutes to complete mixing; S32, after preliminary mixing, naturally cool to room temperature, and wash with deionized water 2 to 3 times to obtain a light-transmitting coating solution; Wherein, by weight, the polycarbonate is 50 to 100 parts, the anti-dripping agent is 0.15 to 0.3 parts, the organic resin is 10 to 20 parts, and the light diffusing agent is 2 to 4.5 parts; S4. Coating the artificial board: evenly coating the light-transmitting coating on the surface of the artificial board, and drying and hot-pressing the artificial board coated with the light-transmitting coating to obtain the artificial board with high-efficiency catalytic decomposition of formaldehyde.

2. The method for preparing a formaldehyde efficient catalytic decomposition artificial board according to claim 1, characterized in that: In S2, the specific steps of pre-pressing and hot pressing to form the artificial board are: S21, at 18-30℃, 250-300kN / m 2 The roller pre-pressing machine is used to continuously pre-press the artificial board under the pressure condition; S22, sending the pre-pressed artificial board to a layered hot press, and hot pressing for 6 to 12 minutes under the conditions of a hot pressing pressure of 1.0 to 1.6 MPa and a hot pressing temperature of 120 to 150° C. to form an artificial board.

3. The method for preparing a formaldehyde efficient catalytic decomposition artificial board according to claim 1, characterized in that: In the above S2, the glue application pressure is also 90-115N when the glue is evenly applied on the bonding surface of the single-piece artificial board.

4. The method for preparing a formaldehyde efficient catalytic decomposition artificial board according to claim 1, characterized in that: In S3, the anti-drip agent is one of a polytetrafluoroethylene anti-drip agent, a coated anti-drip agent or a pure powder anti-drip agent.

5. The method for preparing a formaldehyde efficient catalytic decomposition artificial board according to claim 1, characterized in that: In S4, the coating thickness is 10 to 50 μm, and the coating amount of the light-transmitting coating is 50 to 250 g / m 2 , coating methods include painting, knife coating, air spraying, curtain coating and roller coating.

6. The method for preparing a formaldehyde efficient catalytic decomposition artificial board according to claim 1, characterized in that: In the step S4, when the artificial board is dried, the pre-curing degree of the light-transmitting coating layer is made to reach 60 to 85%.

7. The method for preparing a formaldehyde efficient catalytic decomposition artificial board according to claim 1, characterized in that: In the step S4, when the artificial board is hot pressed, the hot pressing pressure is 0.65-0.89 MPa, the hot pressing temperature is 167-185° C., and the hot pressing time is 20-600 s.

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