A lightweight particleboard for door panels and its continuous flat pressing production method

Abstract

The application provides a light shaving board for door plate and a continuous flat pressing production method thereof, and belongs to the field of light shaving boards. The continuous flat pressing production method of the light shaving board for door plate is composed of the following steps: shaving, surface layer shaving treatment, core layer shaving treatment, drying, gluing, directional paving, continuous flat pressing and post-treatment. The light shaving board for door plate and the continuous flat pressing production method thereof can reduce the density of the shaving board, improve the density uniformity of the shaving board, overcome the problem that the existing shaving board is easy to absorb moisture, effectively avoid the deformation of the light shaving board for door plate in the use process, and further improve the overall physical properties of the shaving board.

Description

Technical Field

[0001] This invention relates to the field of lightweight particleboard, and in particular to a lightweight particleboard for door panels and a continuous flat-press production method thereof. Background Technology

[0002] Particleboard, also known as chipboard, is a type of engineered wood product made by cutting branches, small-diameter wood, and wood chips from various fast-growing timbers into fragments of a certain size, drying them, applying adhesives, and then hot-pressing them under specific temperature conditions.

[0003] The advantages of particleboard are mainly reflected in the following aspects: 1) Low cost: Since particleboard mainly uses wood residues or processing residues as raw materials, its raw material cost is relatively low, making it competitively priced in the market and widely used in home decoration, furniture manufacturing, and other fields. 2) Strong applicability: Particleboard can be processed into large-format boards as needed, effectively meeting the demand for different specifications and styles of boards in home decoration. 3) Good processing performance: Particleboard has good processing performance and can be cut, drilled, assembled, and processed on-site as needed, offering high flexibility and effectively meeting the personalized needs of different scenarios in home decoration. 4) Beautiful and practical: The surface of particleboard is smoothed, with high flatness, showcasing the texture of natural wood. Furthermore, particleboard can be finished and painted according to different needs, further enhancing its decorative and practical value.

[0004] With the development of the times and the advancement of consumer thinking, the dimensions of customized furniture can be flexibly controlled during home decoration and renovation. Whole-house customization offers diverse styles, personalized product structures and functions, and maximizes the use of storage space. In recent years, more and more consumers have chosen whole-house customization for their home decoration and renovation. In current customized home decoration and renovation, floor-to-ceiling wardrobes, due to the absence of segmented doors, look simpler, with clean, crisp lines and better overall integration. Their high aesthetic appeal has made floor-to-ceiling wardrobes a rapidly growing and popular style. Their biggest advantage is their high aesthetic appeal; however, the larger the particleboard panels, the higher the stability requirements. In fact, wardrobe doors that are too tall are almost guaranteed to warp; even using high-quality boards and straighteners only slightly delays the warping time. Therefore, wardrobe door warping is a common phenomenon in home decoration and renovation, especially for customized wardrobes. Warp doors directly affect the lifespan and user experience of the doors, and also seriously impact the appearance of the wardrobe.

[0005] Furthermore, existing particleboard also suffers from problems such as high density, uneven density, and easy moisture absorption, which will further aggravate the deformation problem of large-sized particleboard; at the same time, the overall physical properties of particleboard for door panels need to be further improved. Summary of the Invention

[0006] To address the technical problems existing in the prior art, the present invention provides a lightweight particleboard for door panels and a continuous flat pressing production method thereof. This method can reduce the density of the particleboard, improve the density uniformity of the particleboard, overcome the problem of easy moisture absorption of existing particleboard, effectively avoid deformation of the lightweight particleboard for door panels during use, and further improve the overall physical properties of the particleboard.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] A continuous flat-press production method for lightweight particleboard for door panels comprises the following steps: particleboard processing, surface particleboard treatment, core particleboard treatment, drying, gluing, directional laying, continuous flat-pressing, and post-treatment.

[0009] The method of making wood shavings involves using paulownia wood as raw material to produce surface wood shavings and core wood shavings.

[0010] The method for treating the surface wood shavings involves treating the surface wood shavings with a surface wood shavings treatment solution to obtain modified surface wood shavings; the surface wood shavings treatment solution is a deionized aqueous solution containing silane coupling agent KH-550, Tween-80, and carboxymethyl chitosan.

[0011] The method for treating the core layer shavings is to treat the surface shavings with a core layer shavings treatment solution to obtain modified core layer shavings; the core layer shavings treatment solution is an ethanol solution containing silane coupling agent KH-550, Tween-80, and oregano oil.

[0012] The continuous flat pressing method is as follows: the directional paving blank obtained by directional paving is pre-pressed and then continuously hot-pressed to form a slab.

[0013] The post-processing method involves soaking the board blank in tung oil to obtain lightweight particleboard for door panels.

[0014] Preferably, the surface shavings have the following dimensions: length 1-10mm, width 2-3mm, and thickness 0.3-0.4mm.

[0015] The core layer wood shavings are 50-90mm long, 20-50mm wide, and 0.3-0.7mm thick.

[0016] Preferably, the soaking time for the slab in tung oil is 30-180 seconds; more preferably, it is 100-180 seconds.

[0017] Furthermore, the method for treating the surface wood shavings involves placing the surface wood shavings into a sealed treatment chamber, heating it to 40-45°C, and maintaining the temperature; spraying the surface wood shavings with a surface wood shavings treatment liquid; after the surface wood shavings treatment liquid is sprayed, heating it to 102-105°C and maintaining the temperature; allowing it to cool naturally to 40-45°C, letting it stand, and allowing it to cool naturally to room temperature to obtain modified surface wood shavings.

[0018] The weight ratio of the surface wood shavings to the surface wood shavings treatment liquid is 1:2-2.3.

[0019] Preferably, in the surface shaving treatment, the heating rate to 102-105℃ is 0.8-0.9℃ / min; the holding time at 102-105℃ is 60-90min; and the settling time after natural cooling to 40-45℃ is 5-6h.

[0020] Furthermore, the method for treating the core layer wood shavings is as follows: the core layer wood shavings are placed in a sealed treatment chamber, heated to 40-45°C, and kept at that temperature; the core layer wood shavings are sprayed with a core layer wood shavings treatment liquid; after the core layer wood shavings treatment liquid is sprayed, the temperature is raised to 92-95°C and kept at that temperature; the temperature is then allowed to cool naturally to 40-45°C, left to stand, and allowed to cool naturally to room temperature to obtain modified core layer wood shavings.

[0021] The weight ratio of the core layer wood shavings to the core layer wood shavings treatment liquid is 1:1.8-2.1.

[0022] Preferably, in the core layer shaving treatment, the heating rate to 92-95℃ is 0.6-0.7℃ / min; the holding time at 92-95℃ is 90-120min; and the settling time after natural cooling to 40-45℃ is 6-7h.

[0023] Preferably, in the surface wood shavings treatment solution, the weight ratio of silane coupling agent KH-550, Tween-80, carboxymethyl chitosan, and deionized water is 7-7.5:1-1.2:1.5-1.6:100-105.

[0024] In the core layer shavings treatment solution, the weight ratio of silane coupling agent KH-550, Tween-80, oregano oil, and ethanol solution is 8-8.5:1-1.2:5-6:100-105; the volume concentration of the ethanol solution is 80-85%.

[0025] Furthermore, the drying method involves drying the modified surface layer shavings and the modified core layer shavings to a moisture content of 2-4 wt% to obtain dried modified surface layer shavings and dried modified core layer shavings.

[0026] The method of applying adhesive is to control the amount of adhesive to be 8-8.5 wt% and to spray adhesive onto the dried modified surface wood shavings and the dried modified core wood shavings respectively using a compound adhesive.

[0027] The composite sizing agent is a mixture of MDI adhesive and modified aramid fiber.

[0028] Furthermore, the modified aramid fiber is prepared by completely immersing the aramid fiber in a potassium permanganate solution with a concentration of 0.7-0.8 mol / L, controlling the temperature to 30-35℃, ultrasonically treating it, separating the aramid fiber, washing the aramid fiber with deionized water until neutral, and drying it to obtain the modified aramid fiber.

[0029] Preferably, the ultrasonic treatment frequency is 30-32kHz, the power is 350-400W, and the ultrasonic treatment time is 40-60min;

[0030] In the composite sizing agent, the weight ratio of MDI adhesive to modified aramid fiber is 50-55:7-8.

[0031] Preferably, the aramid fiber has a diameter of 8-12 μm and a length of 3-4 mm.

[0032] Furthermore, the directional paving method involves directionally paving the modified surface layer shavings and modified core layer shavings after adhesive application to obtain a directional paving blank; and controlling the ratio of the surface layer paving thickness to the core layer paving thickness to be 2-4:6-8.

[0033] In the continuous pressing process, the hot pressing and shaping temperature is controlled at 150℃-250℃, and the press speed is 250-950mm / s.

[0034] Preferably, the hot pressing temperature is 190℃-250℃ and the press speed is 700-950mm / s.

[0035] A lightweight particleboard for door panels is prepared using the aforementioned method; the density of the lightweight particleboard for door panels is 0.3-0.4 g / cm³. 3 .

[0036] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0037] (1) The continuous flat-press production method of lightweight particleboard for door panels of the present invention uses paulownia wood as raw material to prepare surface shavings and core shavings. After obtaining these materials, the surface shavings are treated with a surface shavings treatment solution, and the core shavings are treated with a core shavings treatment solution. While modifying the surface shavings and core shavings with amino groups, the compatibility and bonding between the shavings and the modified aramid fibers added during the subsequent gluing process are improved. Furthermore, the antibacterial properties and interlayer bonding performance of the shavings are improved through the synergistic effect of different antibacterial and synergistic components in the surface and core layers, effectively improving the overall stability of the lightweight particleboard. At the same time, potassium permanganate is used in conjunction with the gluing process to modify the surface shavings. Modified aramid fibers can effectively react and bond with modified surface and core shavings during hot pressing, improving interfacial bonding strength and further enhancing the bonding performance between layers of lightweight particleboard, thus improving the overall physical properties and stability of the particleboard. Finally, tung oil impregnation further improves the overall performance of the lightweight particleboard, resulting in lightweight particleboard for door panels. This process reduces particleboard density, improves density uniformity, overcomes the problem of easy moisture absorption in existing particleboard, effectively prevents deformation of lightweight particleboard for door panels during use, and further improves the overall physical properties of the particleboard.

[0038] (2) The density of the lightweight particleboard used for the door panel of the present invention is 0.3-0.4 g / cm³. 3 It has uniform density, with a static bending strength of 52.2-55.1 MPa in the parallel direction, 26.8-27.9 MPa in the perpendicular direction, a modulus of elasticity of 5895-6024 MPa in the parallel direction, an internal bond strength of 1.39-1.44 MPa, an internal bond strength of 0.32-0.33 MPa after boiling for 2 hours, and a surface bond strength of 1.31-1.36 MPa. It can improve the overall physical properties of particleboard while reducing its density and increasing its density uniformity.

[0039] (3) The lightweight particleboard for door panels of the present invention, after being left to stand for 168 hours in an environment with a temperature of 55°C and a relative humidity of 95%, and then dried with hot air at 70°C, has a length change percentage of only 0.004%; after being soaked in deionized water at 20°C for 48 hours, the water absorption thickness expansion rate is only 2.3%, which effectively overcomes the problem of existing particleboard being easy to absorb moisture and can effectively avoid the deformation of lightweight particleboard for door panels during use, especially solving the deformation problem when it is used as a high door panel of a wardrobe. It can be effectively applied to decorative door panels, especially as a door panel for a large wardrobe that extends to the top.

[0040] (4) The lightweight particleboard for door panels of the present invention has an antibacterial activity of up to 99.93% against Escherichia coli and up to 99.89% against Staphylococcus aureus. It has a mildew resistance level of 0 and good antibacterial performance.

[0041] (5) The continuous flat pressing production method of lightweight particleboard for door panels of the present invention has a simple process flow, is easy to operate, has high safety, and can meet the requirements of industrial production. Detailed Implementation

[0042] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention are now described.

[0043] Example 1

[0044] This embodiment provides a continuous flat-press production method for lightweight particleboard for door panels, comprising the following steps:

[0045] 1. Wood shavings

[0046] Paulownia wood is shaving long pieces to produce surface shavings and core shavings.

[0047] The dimensions of the surface wood shavings are 5mm in length, 2.5mm in width, and 0.35mm in thickness.

[0048] The core layer wood shavings are 70mm long, 30mm wide, and 0.35mm thick.

[0049] 2. Surface wood shavings treatment

[0050] The surface wood shavings were placed in a sealed treatment chamber and heated to 40°C and held at that temperature. Then, a surface wood shaving treatment solution was sprayed evenly onto the surface wood shavings. After the surface wood shaving treatment solution was sprayed, the heating rate of the sealed treatment chamber was controlled at 0.8°C / min, and the temperature was raised to 102°C. After holding at that temperature for 60 minutes, the temperature was allowed to cool naturally to 40°C. After standing for 5 hours, the temperature was allowed to cool naturally to room temperature. The residual surface wood shaving treatment solution was drained from the surface wood shavings until there was no continuous liquid dripping from them, thus obtaining modified surface wood shavings.

[0051] The surface wood shavings treatment solution is a deionized aqueous solution containing silane coupling agent KH-550, Tween-80, and carboxymethyl chitosan; the weight ratio of silane coupling agent KH-550, Tween-80, carboxymethyl chitosan, and deionized water in the surface wood shavings treatment solution is 7:1:1.5:100.

[0052] The weight ratio of surface wood shavings to surface wood shaving treatment solution is 1:2.

[0053] 3. Core layer shavings treatment

[0054] The core layer wood shavings were placed in a sealed treatment chamber and heated to 40°C and held at that temperature. Then, the core layer wood shavings were evenly sprayed with a core layer wood shavings treatment solution. After the core layer wood shavings treatment solution was sprayed, the heating rate of the sealed treatment chamber was controlled at 0.65°C / min, and the temperature was raised to 92°C. After holding at that temperature for 90 minutes, the temperature was allowed to cool naturally to 40°C. After standing for 6 hours, the temperature was allowed to cool naturally to room temperature. The residual core layer wood shavings treatment solution was drained from the core layer wood shavings until there was no continuous liquid dripping from the core layer wood shavings, thus obtaining modified core layer wood shavings.

[0055] The core layer shavings treatment solution is an ethanol solution containing silane coupling agent KH-550, Tween-80, and oregano oil. The volume concentration of the ethanol solution in the core layer shavings treatment solution is 80%, and the weight ratio of silane coupling agent KH-550, Tween-80, oregano oil, and ethanol solution is 8:1:5:100.

[0056] The weight ratio of core layer wood chips to core layer wood chip treatment solution is 1:1.8.

[0057] 4. Drying

[0058] The modified surface shavings and modified core shavings were dried to a moisture content of 2 wt% using a flue gas drum dryer, respectively, to obtain dried modified surface shavings and dried modified core shavings.

[0059] 5. Apply adhesive

[0060] Using a roller sizing machine, a compound sizing agent is applied by spraying to dry modified surface wood shavings and modified core wood shavings respectively; the amount of compound sizing agent is controlled to be 8% of the weight of the wood shavings.

[0061] The composite sizing agent is prepared by uniformly mixing MDI adhesive and modified aramid fiber at a weight ratio of 50:7.

[0062] The modified aramid fiber is prepared by completely immersing aramid fibers with a diameter of 8 μm and a length of 3 mm into a 0.7 mol / L potassium permanganate solution, controlling the temperature to 30°C, ultrasonically treating for 40 min, separating the aramid fibers, washing the aramid fibers with deionized water until neutral, and drying to obtain the modified aramid fiber.

[0063] The ultrasonic treatment was performed at a frequency of 30 kHz and a power of 350 W.

[0064] 6. Directional Paving

[0065] Multiple sets of multi-shaped paving heads are used to uniformly and directionally pave the modified surface layer shavings and modified core layer shavings after adhesive application, to obtain directional paving blanks.

[0066] Among them, modified surface layer wood chips are used for directional paving of the upper and lower surface layers, and modified core layer wood chips are used for directional paving of the core layer; and the ratio of the surface layer paving thickness (the sum of the upper and lower surface layers) to the core layer paving thickness is controlled to be 3.5:6.5.

[0067] 7. Continuous pressure equalization

[0068] After being pre-pressed by a pre-pressing device, the directional paving billet enters a continuous flat pressing device for continuous hot pressing and shaping to obtain a slab.

[0069] The hot pressing temperature for hot pressing is 190℃, and the press speed is 700mm / s.

[0070] 8. Post-processing

[0071] Lightweight particleboard for door panels is produced by soaking the hot-pressed and shaped board in tung oil for 100 seconds.

[0072] This embodiment also provides a lightweight particleboard for door panels prepared by the aforementioned method; the density of the lightweight particleboard for door panels is 0.33 g / cm³. 3 .

[0073] Example 2

[0074] This embodiment provides a continuous flat-press production method for lightweight particleboard for door panels, comprising the following steps:

[0075] 1. Wood shavings

[0076] Paulownia wood is shaving long pieces to produce surface shavings and core shavings.

[0077] The dimensions of the surface wood shavings are 5mm in length, 2.5mm in width, and 0.35mm in thickness.

[0078] The core layer wood shavings are 70mm long, 30mm wide, and 0.35mm thick.

[0079] 2. Surface wood shavings treatment

[0080] The surface wood shavings were placed in a sealed treatment chamber and heated to 42°C and held at that temperature. Then, a surface wood shaving treatment solution was sprayed evenly onto the surface wood shavings. After the surface wood shaving treatment solution was sprayed, the heating rate of the sealed treatment chamber was controlled at 0.85°C / min, and the temperature was raised to 103°C. After holding at that temperature for 75 minutes, the temperature was allowed to cool naturally to 42°C. After standing for 5.5 hours, the temperature was allowed to cool naturally to room temperature. The residual surface wood shaving treatment solution was drained from the surface wood shavings until there was no continuous liquid dripping from them, thus obtaining modified surface wood shavings.

[0081] The surface wood shavings treatment solution is a deionized aqueous solution containing silane coupling agent KH-550, Tween-80, and carboxymethyl chitosan; the weight ratio of silane coupling agent KH-550, Tween-80, carboxymethyl chitosan, and deionized water in the surface wood shavings treatment solution is 7.2:1.1:1.55:102.

[0082] The weight ratio of surface wood chips to surface wood chip treatment solution is 1:25.

[0083] 3. Core layer shavings treatment

[0084] The core layer wood shavings were placed in a sealed processing chamber and heated to 42°C and held at that temperature. Then, the core layer wood shavings were uniformly sprayed with a core layer wood shavings treatment solution. After the core layer wood shavings treatment solution was sprayed, the heating rate of the sealed processing chamber was controlled at 0.65°C / min, and the temperature was raised to 93°C. After holding at that temperature for 110 minutes, the temperature was allowed to cool naturally to 42°C. After standing for 6.5 hours, the temperature was allowed to cool naturally to room temperature. The residual core layer wood shavings treatment solution was drained from the core layer wood shavings until there was no continuous liquid dripping from the core layer wood shavings, thus obtaining modified core layer wood shavings.

[0085] The core layer wood shavings treatment solution is an ethanol solution containing silane coupling agent KH-550, Tween-80, and oregano oil. The volume concentration of the ethanol solution in the core layer wood shavings treatment solution is 82.5%, and the weight ratio of silane coupling agent KH-550, Tween-80, oregano oil, and ethanol solution is 8.2:1.1:5.5:102.

[0086] The weight ratio of core layer wood chips to core layer wood chip treatment solution is 1:1.9.

[0087] 4. Drying

[0088] The modified surface wood shavings and modified core wood shavings were dried to a moisture content of 2.5 wt% using a mesh belt low-temperature dryer, respectively, to obtain dried modified surface wood shavings and dried modified core wood shavings.

[0089] 5. Apply adhesive

[0090] Using a roller sizing machine, a compound sizing agent is applied by spraying to dry modified surface wood shavings and modified core wood shavings respectively; the amount of compound sizing agent is controlled to be 8.2% of the weight of the wood shavings.

[0091] The composite sizing agent is prepared by uniformly mixing MDI adhesive and modified aramid fiber at a weight ratio of 53:7.5.

[0092] The modified aramid fiber is prepared by completely immersing the aramid fiber in a 0.75 mol / L potassium permanganate solution, controlling the temperature to 32°C, ultrasonically treating for 50 min, separating the aramid fiber, washing the aramid fiber with deionized water until neutral, and drying it to obtain the modified aramid fiber.

[0093] The ultrasonic treatment was performed at a frequency of 31 kHz and a power of 380 W.

[0094] 6. Directional Paving

[0095] Multiple sets of multi-shaped paving heads are used to uniformly and directionally pave the modified surface layer shavings and modified core layer shavings after adhesive application, to obtain directional paving blanks.

[0096] Among them, modified surface layer wood chips are used for directional paving of the upper and lower surface layers, and modified core layer wood chips are used for directional paving of the core layer; and the ratio of the surface layer paving thickness (the sum of the upper and lower surface layers) to the core layer paving thickness is controlled to be 3.5:6.5.

[0097] 7. Continuous pressure equalization

[0098] After being pre-pressed by a pre-pressing device, the directional paving billet enters a continuous flat pressing device for continuous hot pressing and shaping to obtain a slab.

[0099] The hot pressing temperature for hot pressing is 225℃, and the press speed is 850mm / s.

[0100] 8. Post-processing

[0101] Lightweight particleboard for door panels is produced by soaking the hot-pressed and shaped board in tung oil for 140 seconds.

[0102] This embodiment also provides a lightweight particleboard for door panels prepared by the aforementioned method; the density of the lightweight particleboard for door panels is 0.34 g / cm³. 3 .

[0103] Example 3

[0104] This embodiment provides a continuous flat-press production method for lightweight particleboard for door panels, comprising the following steps:

[0105] 1. Wood shavings

[0106] Paulownia wood is rotary-cut into surface shavings and core shavings.

[0107] The dimensions of the surface wood shavings are 5mm in length, 2.5mm in width, and 0.35mm in thickness.

[0108] The core layer wood shavings are 70mm long, 30mm wide, and 0.35mm thick.

[0109] 2. Surface wood shavings treatment

[0110] The surface wood shavings were placed in a sealed treatment chamber and heated to 45°C and held at that temperature. Then, a surface wood shaving treatment solution was sprayed evenly onto the surface wood shavings. After the surface wood shaving treatment solution was sprayed, the heating rate of the sealed treatment chamber was controlled at 0.9°C / min, and the temperature was raised to 105°C. After holding at that temperature for 90 minutes, the temperature was allowed to cool naturally to 45°C. After standing for 6 hours, the temperature was allowed to cool naturally to room temperature. The residual surface wood shaving treatment solution was drained from the surface wood shavings until no continuous liquid dripped from them, thus obtaining modified surface wood shavings.

[0111] The surface wood shavings treatment solution is a deionized aqueous solution containing silane coupling agent KH-550, Tween-80, and carboxymethyl chitosan; the weight ratio of silane coupling agent KH-550, Tween-80, carboxymethyl chitosan, and deionized water in the surface wood shavings treatment solution is 7.5:1.2:1.6:105.

[0112] The weight ratio of surface wood shavings to surface wood shavings treatment solution is 1:2.3.

[0113] 3. Core layer shavings treatment

[0114] The core layer wood shavings were placed in a sealed treatment chamber and heated to 45°C and held at that temperature. Then, the core layer wood shavings were evenly sprayed with a core layer wood shavings treatment solution. After the core layer wood shavings treatment solution was sprayed, the heating rate of the sealed treatment chamber was controlled at 0.7°C / min, and the temperature was raised to 95°C. After holding at that temperature for 120 minutes, the temperature was allowed to cool naturally to 45°C. After standing for 7 hours, the temperature was allowed to cool naturally to room temperature. The residual core layer wood shavings treatment solution was drained from the core layer wood shavings until there was no continuous liquid dripping from the core layer wood shavings, thus obtaining modified core layer wood shavings.

[0115] The core layer wood shavings treatment solution is an ethanol solution containing silane coupling agent KH-550, Tween-80, and oregano oil. The volume concentration of the ethanol solution in the core layer wood shavings treatment solution is 85%, and the weight ratio of silane coupling agent KH-550, Tween-80, oregano oil, and ethanol solution is 8.5:1.2:6:105.

[0116] The weight ratio of core layer wood shavings to core layer wood shavings treatment solution is 1:2.1.

[0117] 4. Drying

[0118] The modified surface shavings and modified core shavings were dried to a moisture content of 3 wt% using a mesh belt low-temperature dryer, respectively, to obtain dried modified surface shavings and dried modified core shavings.

[0119] 5. Apply adhesive

[0120] Using a roller-type sizing machine, a compound sizing agent is applied by spraying to dry modified surface wood shavings and modified core wood shavings respectively; the amount of compound sizing agent is controlled to be 8.5% of the weight of the wood shavings.

[0121] The composite sizing agent is prepared by uniformly mixing MDI adhesive and modified aramid fiber at a weight ratio of 55:8.

[0122] The modified aramid fiber is prepared by completely immersing aramid fibers with a diameter of 12 μm and a length of 4 mm into a 0.8 mol / L potassium permanganate solution, controlling the temperature to 35°C, ultrasonically treating for 60 min, separating the aramid fibers, washing the aramid fibers with deionized water until neutral, and drying to obtain the modified aramid fiber.

[0123] The ultrasonic treatment was performed at a frequency of 32 kHz and a power of 400 W.

[0124] 6. Directional Paving

[0125] Multiple sets of multi-shaped paving heads are used to uniformly and directionally pave the modified surface layer shavings and modified core layer shavings after adhesive application, to obtain directional paving blanks.

[0126] Among them, modified surface layer wood chips are used for directional paving of the upper and lower surface layers, and modified core layer wood chips are used for directional paving of the core layer; and the ratio of the surface layer paving thickness (the sum of the upper and lower surface layers) to the core layer paving thickness is controlled to be 3.5:6.5.

[0127] 7. Continuous pressure equalization

[0128] After being pre-pressed by a pre-pressing device, the directional paving billet enters a continuous flat pressing device for continuous hot pressing and shaping to obtain a slab.

[0129] The hot pressing temperature for hot pressing is 250℃, and the press speed is 950mm / s.

[0130] 8. Post-processing

[0131] Lightweight particleboard for door panels is produced by soaking the hot-pressed and shaped board in tung oil for 180 seconds.

[0132] This embodiment also provides a lightweight particleboard for door panels prepared by the aforementioned method; the density of the lightweight particleboard for door panels is 0.36 g / cm³. 3 .

[0133] Comparative Example 1

[0134] A comparative example was set up for Example 2, specifically using the continuous flat pressing production method of lightweight particleboard for door panels in Example 2. The main differences are: 1) the silane coupling agent KH-550 is omitted in the surface particle treatment liquid and the core particle treatment liquid; 2) in the adhesive application step, the addition of modified aramid fiber is omitted, and MDI adhesive is directly used for adhesive application.

[0135] The static bending strength in the parallel direction, static bending strength in the perpendicular direction, modulus of elasticity in the parallel direction, internal bond strength, internal bond strength after boiling for 2 hours, and surface bond strength of the lightweight particleboard used for door panels in Examples 1-3 and Comparative Example 1 were tested. Specific testing methods were performed according to the relevant content in GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels". The specific test results are shown below:

[0136]

[0137] Furthermore, the moisture absorption deformation properties of the lightweight particleboard used for door panels in Examples 1-3 and Comparative Example 1 were tested with reference to the relevant content of GB / T 17657-2022. Specifically, each lightweight particleboard used for door panels was cut into samples with a length and width of 120 mm. Each sample was then placed in an environment with a temperature of 55°C and a relative humidity of 95% for 168 hours under constant temperature and humidity. Afterward, it was transferred to a forced-air drying oven and dried with hot air at 70°C until constant weight. The percentage change in length of the lightweight particleboard used for door panels was then measured. Additionally, another sample from Examples 1-3 and Comparative Example 1 was completely immersed in deionized water at a temperature of 20°C and left to stand for 48 hours under constant temperature. The water absorption thickness expansion rate was then measured. The specific test results are shown below:

[0138]

[0139] Furthermore, referring to the antibacterial properties test method under light conditions in Section 1.3.3 of "The Influence of Impregnation Method on the Antibacterial Properties of Antibacterial Impregnated Veneer" (Du Hongshuang et al., Forest Products Industry, 2015.12, DOI:10.3969 / j.issn.1001-5299.2015.12.005), the antibacterial properties of the lightweight particleboard for door panels in Examples 1-3 against Escherichia coli and Staphylococcus aureus were tested; and the mildew resistance level of the lightweight particleboard for door panels in Examples 1-3 was also tested. The specific test results are shown below:

[0140]

[0141] As can be seen, the continuous flat-press production method for lightweight particleboard for door panels in Examples 1-3 of this invention uses paulownia wood as raw material to prepare surface shavings and core shavings. The surface shavings are then treated with a surface shavings treatment solution, and the core shavings are treated with a core shavings treatment solution. This process modifies the surface of both the surface and core shavings with amino groups, improving the compatibility and bonding between the shavings and the modified aramid fibers added during subsequent gluing. Furthermore, the synergistic effect of different antibacterial and synergistic components within the surface and core layers enhances antibacterial properties and interlayer bonding performance, effectively improving the overall stability of the lightweight particleboard. Simultaneously, the use of potassium permanganate-modified aramid fibers during gluing allows the modified aramid fibers to bond with the modified surface and core shavings during hot pressing. Effective reactive bonding enhances interfacial bonding strength and further improves the bonding performance between layers of lightweight particleboard, thereby improving the overall physical properties and stability of the particleboard. Finally, tung oil impregnation further improves the overall performance of the lightweight particleboard, resulting in lightweight particleboard for door panels. This process reduces particleboard density, improves density uniformity, overcomes the existing problem of easy moisture absorption in particleboard, effectively prevents deformation during use, and further improves the overall physical properties of the particleboard. It effectively prevents deformation during use, especially when used as a tall wardrobe door panel, making it suitable for decorative door panels, particularly for large wardrobe doors that extend to the ceiling.

[0142] Unless otherwise stated, all percentages used in this invention are mass percentages.

[0143] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous flat-press production method of a light shavings board for a door panel, characterized by, It is characterized by the following steps: shaving, surface shaving treatment, core shaving treatment, drying, gluing, directional paving, continuous flat pressing, post-treatment; The method for the shaving is to use Paulownia wood as raw material to make surface shavings and core shavings; The method for the surface shaving treatment is to treat the surface shavings with a surface shaving treatment liquid to obtain modified surface shavings; the surface shaving treatment liquid is a deionized water solution in which silane coupling agent KH-550, Tween-80 and carboxymethyl chitosan are dispersed; The method for the core shaving treatment is to treat the core shavings with a core shaving treatment liquid to obtain modified core shavings; the core shaving treatment liquid is an ethanol solution in which silane coupling agent KH-550, Tween-80 and oregano oil are dispersed; The method for the drying is to dry the modified surface shavings and the modified core shavings respectively to a moisture content of 2-4wt% to obtain dried modified surface shavings and dried modified core shavings; The method for the gluing is to control the gluing amount to be 8-8.5wt% and to spray the dried modified surface shavings and the dried modified core shavings respectively with a composite sizing agent; The composite sizing agent is a mixture of MDI adhesive and modified aramid fiber; The preparation method of the modified aramid fiber is to immerse aramid fiber completely in a potassium permanganate solution with a concentration of 0.7-0.8mol / L, control the temperature to 30-35℃, separate the aramid fiber after ultrasonic treatment, wash the aramid fiber with deionized water until neutral, and dry to obtain the modified aramid fiber; The method for the continuous flat pressing is to pre-press the directional paving blank obtained by directional paving, and then to continuously hot-press the blank to shape to obtain a board blank; The method for the post-treatment is to soak the board blank with tung oil to obtain a door panel made of light shaving board.

2. The continuous flat pressing production method of a light shavings board for a door panel according to claim 1, characterized in that, The size of the surface shavings is 1-10mm in length, 2-3mm in width and 0.3-0.4mm in thickness; The size of the core shavings is 50-90mm in length, 20-50mm in width and 0.3-0.7mm in thickness.

3. The continuous flat pressing production method of a light shavings board for a door panel according to claim 1, characterized in that, The method for the surface shaving treatment is to put the surface shavings into a sealed treatment cabin, heat to 40-45℃ and keep warm; spray the surface shavings with the surface shaving treatment liquid, heat to 102-105℃ after the spraying of the surface shaving treatment liquid is completed, and keep warm; naturally cool to 40-45℃, stand still, naturally cool to room temperature, and obtain modified surface shavings; The weight ratio of the surface shavings to the surface shaving treatment liquid is 1:2-2.

3.

4. The continuous flat pressing production method of a light shavings board for a door panel according to claim 1, characterized in that, The method for the core shaving treatment is to put the core shavings into a sealed treatment cabin, heat to 40-45℃ and keep warm; spray the core shavings with the core shaving treatment liquid, heat to 92-95℃ after the spraying of the core shaving treatment liquid is completed, and keep warm; naturally cool to 40-45℃, stand still, naturally cool to room temperature, and obtain modified core shavings; The weight ratio of the core shavings to the core shaving treatment liquid is 1:1.8-2.

1.

5. The continuous flat pressing production method of a light shavings board for a door panel according to claim 1, characterized in that, The weight ratio of the silane coupling agent KH-550, Tween-80, carboxymethyl chitosan and deionized water in the surface layer shaving treatment solution is 7-7.5:1-1.2:1.5-1.6:100-105; The weight ratio of the silane coupling agent KH-550, Tween-80, oregano oil and ethanol solution in the core layer shaving treatment solution is 8-8.5:1-1.2:5-6:100-105; the volume concentration of the ethanol solution is 80-85%.

6. The continuous flat pressing production method of a light shavings board for a door panel according to claim 1, characterized in that, The frequency of the ultrasonic treatment is 30-32 kHz, the power is 350-400 W, and the ultrasonic treatment time is 40-60 min. The weight ratio of the MDI adhesive and the modified aramid fiber in the composite sizing agent is 50-55:7-8.

7. The continuous flat pressing production method of a light shavings board for a door panel according to claim 1, characterized in that, The method of directional paving is to perform directional paving on the modified surface layer shavings and the modified core layer shavings after sizing to obtain a directional paving blank; and the ratio of the surface layer paving thickness to the core layer paving thickness is controlled to be 2-4:6-8. In the continuous flat pressing, the hot pressing and shaping temperature is controlled to be 150-250 DEG C, and the press machine speed is 250-950 mm / s.

8. A light-weight particle board for door panels, characterized by made by the method of any one of claims 1 to 7; the density of the door panel made of light chipboard is 0.3 to 0.4 g / cm 3 .

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