Manufacturing process of insulating laminated wood with multilayer structure

Abstract

The invention relates to the technical field of wood, in particular to a multilayer structure insulation laminated wood manufacturing process which comprises the following steps: pretreatment: selecting birch fiber sheets with the thickness of 0.2-0.4 mm, and degreasing, cleaning and drying the birch fiber sheets; flame retardant treatment, wherein the surfaces of the pretreated birch fiber sheets are coated with a flame retardant solvent for 1-3 times through spraying equipment; and preparing impregnation liquid. According to the invention, epoxy resin is further crosslinked with residual hydroxyl of isocyanate resin through ring-opening reaction of epoxy groups to form a three-dimensional interpenetrating network structure, pores of wood fibers are effectively sealed, and an internal ion migration path is blocked, so that the insulativity is improved; meanwhile, the surface activity of the ceramic particles in the functional additive is enhanced after plasma treatment, stronger interface bonding is formed between the ceramic particles and the resin matrix, microcracks and holes at the interface are reduced, the breakdown risk caused by local electric field concentration is avoided, and the insulation effect is enhanced.

Description

Technical Field

[0001] This invention relates to the field of wood technology, specifically to a manufacturing process for multi-layered insulating laminated wood. Background Technology

[0002] Currently, with the development of the power industry, the requirements for electrical insulation materials are increasing. Traditional wood materials are limited in their application in high-voltage electrical equipment due to their natural porosity and low electrical insulation performance. In recent years, multi-layer laminated wood, as an emerging composite material, has attracted much attention due to its high mechanical strength and good insulation performance.

[0003] Currently, the main problem with existing laminated wood is its unstable electrical insulation performance, especially in humid environments where it easily absorbs water, leading to a decline in electrical performance and poor long-term stability. Based on this, the present invention provides a manufacturing process for multi-layer insulating laminated wood. Summary of the Invention

[0004] The purpose of this invention is to provide a manufacturing process for multi-layer insulating laminated wood, which improves the electrical insulation, flame retardancy and water resistance of wood.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a manufacturing process for multi-layer insulating laminated wood, comprising the following steps: Step 1: Pretreatment. Select birch wood fiber sheets with a thickness of 0.2-0.4 mm, and degrease, clean, and dry them. Step 2: Flame retardant treatment. Apply flame retardant solvent 1-3 times to the surface of the pretreated birch fiber sheet using a spraying device. Step 3: Preparation of impregnation solution; the impregnation solution is prepared. Step 4: Impregnation treatment. The flame-retardant birch fiber sheets are placed in the impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated birch fiber sheets are stacked layer by layer and cured and shaped using a hot press to obtain a multi-layered insulating laminated wood. In step three, the impregnation solution is made from the following raw materials in parts by weight: 60-70 parts isocyanate resin, 15-20 parts epoxy resin, 10-15 parts water glass, 5-10 parts functional additives, and 5-10 parts flame retardant additives.

[0006] Furthermore, the pretreatment includes the following steps: immersing birch fiber sheets in a stainless steel container containing degreasing solution at room temperature for 0.5-1 hour, stirring with a stirrer at 50-100 r / min during the immersion process, removing the sheets after immersion, rinsing them with running water for 5-10 minutes, and then air-drying them at room temperature.

[0007] Furthermore, the degreasing solution is composed of ethanol and an organosilicon waterproofing agent, wherein the mass ratio of the organosilicon waterproofing agent to ethanol is 2:9, the concentration of ethanol is 95%, the concentration of the organosilicon waterproofing agent is 10%-20%, and the organosilicon waterproofing agent is either methylsilane or ethylsilane.

[0008] Furthermore, the flame retardant solvent in step two is prepared by the following steps: selecting magnesium hydroxide, water, and a dispersant, adding magnesium hydroxide, water, and a dispersant to a stirring device, and stirring at 500-1000 r / min for 20-30 min to complete the preparation of the flame retardant solvent. The spraying pressure of the spraying device is 0.2-0.5 MPa, and the spraying speed is 10-30 cm / s.

[0009] Furthermore, the mass ratio of magnesium hydroxide, water, and dispersant is 2.5:7.5:0.03, and the dispersant is polyvinylpyrrolidone.

[0010] Furthermore, the functional additive is prepared by the following method: waste ceramic fibers are collected from a ceramic processing workshop, sorted, and then washed in a drum washing machine for 30-60 minutes. Afterward, they are placed in an oven and dried at 80-100℃ for 2-4 hours. After drying, they are removed, crushed, ground, and sieved to obtain ceramic particles with a particle size of 80-100 micrometers. The ceramic particles are then evenly distributed in a reaction chamber, and a vacuum chamber is used to achieve a vacuum degree of 1×10⁻⁶. -1 ~1×10 -3 The process involves continuously injecting nitrogen gas at 10-50 sccm and using a plasma generator with a power of 300-700 W for 7-15 minutes, after which the plasma is removed to complete the preparation of the functional additive.

[0011] Furthermore, the impregnation solution is prepared by the following method: isocyanate resin and epoxy resin are added to a temperature-controlled stirring device, the temperature is controlled at 20-30°C, and the mixture is stirred at 200-500 r / min for 10-16 min. Then, water glass is added and stirring is continued for 10-15 min. Finally, functional additives and flame retardant additives are added, the stirring speed is increased to 500-1000 r / min, and the mixture is stirred for 20-30 min to complete the preparation of the impregnation solution.

[0012] Furthermore, the impregnation treatment includes the following steps: immersing birch wood fiber chips in an impregnation tank containing impregnation solution and allowing them to stand for 2-3 hours. During the standing process, the stirrer is started every 10-20 minutes and stirred at a speed of 30-60 r / min for 5-10 minutes to complete the impregnation treatment.

[0013] Furthermore, the flame retardant additive is at least one of melamine cyanurate, red phosphorus, or zinc borate.

[0014] Furthermore, in step five, the temperature of the hot press during hot pressing is set to 150℃±5℃, the pressure is set to 10MPa±0.5MPa, and the curing time is 2h.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, the isocyanate resin in the impregnation solution contains highly active isocyanate groups, which react with the hydroxyl groups in the wood fibers during hot pressing and curing to form stable urethane bonds, significantly reducing the polarity of the wood substrate. The epoxy resin further crosslinks with the residual hydroxyl groups of the isocyanate resin through the ring-opening reaction of the epoxy groups, forming a three-dimensional interpenetrating network structure, effectively sealing the pores of the wood fibers and blocking the internal ion migration path, thereby improving insulation. At the same time, the ceramic particles in the functional additives have enhanced surface activity after plasma treatment, forming a stronger interfacial bond with the resin matrix, reducing microcracks and voids at the interface, avoiding the risk of breakdown caused by local electric field concentration, and strengthening the insulation effect.

[0016] 2. In this invention, during pretreatment, the silanol group at one end of the organosilicon waterproofing agent in the degreasing liquid readily reacts with the abundant hydroxyl groups on the surface of birch wood fibers, forming a strong chemical bond. After the reaction, the hydrophobic organic groups at the other end of the organosilicon waterproofing agent are arranged outwards, constructing a continuous and tight waterproof protective film on the surface of the wood fibers. At the same time, during hot pressing, the water glass can intertwine and react with the wood fibers and ceramic particles in the functional additives to construct a complex cemented network structure, further sealing the original pores inside the wood, significantly reducing the channels for water to enter, making it difficult for water to penetrate into the interior of the material. In conjunction with the protective film formed by the organosilicon waterproofing agent in the early stage, the waterproof performance of the multi-layered insulating laminated wood is comprehensively improved.

[0017] 3. In this invention, during the flame retardant treatment step, magnesium hydroxide, as the core flame retardant component, decomposes and absorbs a large amount of heat when heated, effectively reducing the surface temperature of the wood fiber sheet and inhibiting the combustion reaction from the source. At the same time, the ceramic particles in the functional additives, after special treatment, have high melting point and thermal stability, which can provide stable support for the flame retardant system during combustion. Together with the flame retardant additives, they comprehensively improve the flame retardant performance of the multi-layer insulating laminated wood. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: A manufacturing process for multi-layer insulating laminated wood, comprising the following steps: Step 1: Pretreatment. Select birch wood fiber sheets with a thickness of 0.2mm, and degrease, clean, and dry them. Step 2: Flame retardant treatment. Apply a flame retardant solvent once to the surface of the pretreated birch fiber sheet using a spraying device. Step 3: Preparation of impregnation solution; the impregnation solution is prepared. Step 4: Impregnation treatment. The flame-retardant birch fiber sheets are placed in the impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated birch fiber sheets are stacked layer by layer and cured and shaped using a hot press to obtain a multi-layered insulating laminated wood. In step three, the impregnation solution is made from the following raw materials in parts by weight: 60 parts isocyanate resin, 15 parts epoxy resin, 10 parts water glass, 5 parts functional additives, and 5 parts flame retardant additives.

[0020] The pretreatment includes the following steps: immersing birch fiber sheets in a stainless steel container containing degreasing solution at room temperature for 0.5 hours, stirring at 50 rpm during the immersion process, removing the sheets after immersion, rinsing them with running water for 5 minutes, and then air-drying them at room temperature.

[0021] The degreasing solution is composed of ethanol and silicone waterproofing agent, with a mass ratio of silicone waterproofing agent to ethanol of 2:9. The concentration of ethanol is 95%, and the concentration of silicone waterproofing agent is 10%. The silicone waterproofing agent used is methylsilane.

[0022] In step two, the flame retardant solvent is prepared by the following steps: magnesium hydroxide, water and dispersant are selected, and magnesium hydroxide, water and dispersant are added to the stirring equipment and stirred at 500 r / min for 20 min to complete the preparation of the flame retardant solvent. The spraying pressure of the spraying equipment is 0.2 MPa and the spraying speed is 10 cm / s.

[0023] The mass ratio of magnesium hydroxide, water, and dispersant is 2.5:7.5:0.03, and the dispersant used is polyvinylpyrrolidone.

[0024] The functional additives are prepared by the following method: Waste ceramic fibers are collected from a ceramic processing workshop, sorted, and then washed in a drum washing machine for 30 minutes. Afterward, they are placed in an oven and dried at 80°C for 2 hours. After drying, they are removed, crushed, ground, and sieved to obtain ceramic particles with a particle size of 80 micrometers. The ceramic particles are then evenly distributed in a reaction chamber, and a vacuum chamber is used to achieve a vacuum degree of 1×10⁻⁶. -1 The process involved injecting nitrogen gas at a pressure of 10 sccm and using a plasma generator with a power of 300 W for 7 minutes. The plasma was then removed to complete the preparation of the functional additive.

[0025] The impregnation solution is prepared by adding isocyanate resin and epoxy resin to a temperature-controlled stirring device, controlling the temperature at 20°C, stirring at 200 r / min for 10 min, adding water glass, and continuing to stir for 10 min, finally adding functional additives and flame retardant additives, increasing the speed to 500 r / min, and stirring for 20 min to complete the preparation of the impregnation solution.

[0026] The impregnation process includes the following steps: immersing birch wood fiber chips in an impregnation tank containing impregnation solution and allowing them to stand for 2 hours. During the standing process, the stirrer is started every 10 minutes and stirred at a speed of 30 r / min for 5 minutes to complete the impregnation process.

[0027] The flame retardant additive is melamine cyanurate.

[0028] In step five, the temperature of the hot press during hot pressing is set to 150℃±5℃, the pressure is set to 10MPa±0.5MPa, and the curing time is 2h.

[0029] Example 2: A manufacturing process for multi-layer insulating laminated wood, comprising the following steps: Step 1: Pretreatment. Select birch wood fiber sheets with a thickness of 0.3mm, and degrease, clean, and dry them. Step 2: Flame retardant treatment, applying flame retardant solvent twice to the surface of the pretreated birch fiber sheet using a spraying device; Step 3: Preparation of impregnation solution; the impregnation solution is prepared. Step 4: Impregnation treatment. The flame-retardant birch fiber sheets are placed in the impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated birch fiber sheets are stacked layer by layer and cured and shaped using a hot press to obtain a multi-layered insulating laminated wood. In step three, the impregnation solution is made from the following raw materials in parts by weight: 65 parts isocyanate resin, 17 parts epoxy resin, 12 parts water glass, 7 parts functional additives, and 7 parts flame retardant additives.

[0030] The pretreatment includes the following steps: immersing birch fiber sheets in a stainless steel container containing degreasing solution at room temperature for 0.75 hours, stirring at 75 rpm during the immersion process, removing the sheets after immersion, rinsing them with running water for 7.5 minutes, and then air-drying them at room temperature.

[0031] The degreasing solution is composed of ethanol and silicone waterproofing agent, with a mass ratio of silicone waterproofing agent to ethanol of 2:9. The concentration of ethanol is 95%, and the concentration of silicone waterproofing agent is 15%. The silicone waterproofing agent is methylsilane or...

[0032] In step two, the flame retardant solvent is prepared by the following steps: magnesium hydroxide, water and dispersant are selected, and magnesium hydroxide, water and dispersant are added to the stirring equipment and stirred at 750 r / min for 25 min to complete the preparation of the flame retardant solvent. The spraying pressure of the spraying equipment is 0.35 MPa and the spraying speed is 20 cm / s.

[0033] The mass ratio of magnesium hydroxide, water, and dispersant is 2.5:7.5:0.03, and the dispersant used is polyvinylpyrrolidone.

[0034] The functional additives are prepared by the following method: Waste ceramic fibers are collected from a ceramic processing workshop, sorted, and then washed in a drum washing machine for 45 minutes. Afterward, they are placed in an oven and dried at 90°C for 3 hours. After drying, they are removed, crushed, ground, and sieved to obtain ceramic particles with a particle size of 90 micrometers. The ceramic particles are then evenly distributed in a reaction chamber, and a vacuum chamber is used to achieve a vacuum degree of 1×10⁻⁶. -2 The process involved injecting nitrogen gas at a pressure of 10-50 sccm and using a plasma generator with a power of 500 W for 11 minutes. The plasma was then removed to complete the preparation of the functional additive.

[0035] The impregnation solution is prepared by adding isocyanate resin and epoxy resin to a temperature-controlled stirring device, controlling the temperature at 25°C, stirring at 350 r / min for 13 min, adding water glass, and continuing to stir for 12.5 min, finally adding functional additives and flame retardant additives, increasing the speed to 750 r / min, and stirring for 25 min to complete the preparation of the impregnation solution.

[0036] The impregnation process includes the following steps: immersing birch fiber chips in an impregnation tank containing impregnation solution and allowing them to stand for 2.5 hours. During the standing process, the stirrer is started every 15 minutes and stirred at a speed of 45 r / min for 7.5 minutes to complete the impregnation process.

[0037] The flame retardant additive is melamine cyanurate.

[0038] In step five, the temperature of the hot press during hot pressing is set to 150℃±5℃, the pressure is set to 10MPa±0.5MPa, and the curing time is 2h.

[0039] Example 3: A manufacturing process for multi-layer insulating laminated wood, comprising the following steps: Step 1: Pretreatment. Select birch wood fiber sheets with a thickness of 0.4mm, and degrease, clean, and dry them. Step 2: Flame retardant treatment, applying flame retardant solvent three times to the surface of the pretreated birch fiber sheet using a spraying device; Step 3: Preparation of impregnation solution; the impregnation solution is prepared. Step 4: Impregnation treatment. The flame-retardant birch fiber sheets are placed in the impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated birch fiber sheets are stacked layer by layer and cured and shaped using a hot press to obtain a multi-layered insulating laminated wood. In step three, the impregnation solution is made from the following raw materials in parts by weight: 70 parts isocyanate resin, 20 parts epoxy resin, 15 parts water glass, 10 parts functional additives, and 10 parts flame retardant additives.

[0040] The pretreatment includes the following steps: immersing birch fiber sheets in a stainless steel container containing degreasing solution for 1 hour at room temperature. During the immersion process, the sheets are stirred at 100 rpm. After immersion, the sheets are removed, rinsed with running water for 10 minutes, and then air-dried at room temperature.

[0041] The degreasing solution is composed of ethanol and silicone waterproofing agent, with a mass ratio of silicone waterproofing agent to ethanol of 2:9. The concentration of ethanol is 95%, and the concentration of silicone waterproofing agent is 20%. The silicone waterproofing agent used is methylsilane.

[0042] In step two, the flame retardant solvent is prepared by the following steps: magnesium hydroxide, water and dispersant are selected, and magnesium hydroxide, water and dispersant are added to the stirring equipment and stirred at 1000 r / min for 30 min to complete the preparation of the flame retardant solvent. The spraying pressure of the spraying equipment is 0.5 MPa and the spraying speed is 30 cm / s.

[0043] The mass ratio of magnesium hydroxide, water, and dispersant is 2.5:7.5:0.03, and the dispersant used is polyvinylpyrrolidone.

[0044] The functional additives are prepared by the following method: Waste ceramic fibers are collected from a ceramic processing workshop, sorted, and then washed in a drum washing machine for 60 minutes. Afterward, they are placed in an oven and dried at 100°C for 4 hours. After drying, they are removed, crushed, ground, and sieved to obtain ceramic particles with a particle size of 100 micrometers. The ceramic particles are then evenly distributed in a reaction chamber, and a vacuum chamber is used to achieve a vacuum degree of 1×10⁻⁶. -3 The process involved injecting nitrogen gas at a pressure of 50 sccm and using a plasma generator with a power of 700 W for 15 minutes. The plasma was then removed to complete the preparation of the functional additive.

[0045] The impregnation solution is prepared by adding isocyanate resin and epoxy resin to a temperature-controlled stirring device, controlling the temperature at 30°C, stirring at 500 r / min for 16 min, adding water glass, and continuing to stir for 15 min, finally adding functional additives and flame retardant additives, increasing the speed to 1000 r / min, and stirring for 30 min to complete the preparation of the impregnation solution.

[0046] The impregnation process includes the following steps: immersing birch fiber chips in an impregnation tank containing impregnation solution and allowing them to stand for 3 hours. During the standing process, the stirrer is started every 20 minutes and stirred at a speed of 60 r / min for 5-10 minutes to complete the impregnation process.

[0047] The flame retardant additive is melamine cyanurate.

[0048] In step five, the temperature of the hot press during hot pressing is set to 150℃±5℃, the pressure is set to 10MPa±0.5MPa, and the curing time is 2h.

[0049] Comparative Example 1: The difference between this comparative example and Examples 1-3 is that no functional additives were added when preparing the impregnation solution in this comparative example.

[0050] Comparative Example 2 differs from Examples 1-3 in that no flame retardant additive was added when preparing the impregnation solution in this comparative example.

[0051] Comparative Example 3 differs from Examples 1-3 in that the birch fiber sheet was not treated with flame retardant.

[0052] Comparative Example 4 differs from Examples 1-3 in that no silicone waterproofing agent was added when preparing the degreasing solution in this comparative example.

[0053] The manufacturing processes of the multilayer insulating laminated wood prepared in Examples 1-3 and Comparative Examples 1-4 were tested for performance. The test items and methods are as follows: Volume resistivity test: Under an environment of DC voltage 500V and test time of 60 seconds, a three-electrode system is used to measure the resistance value after the voltage stabilizes and calculate the volume resistivity. Test standard GB / T1410-2006. For the water absorption test, the sample was soaked in distilled water for 24 hours at room temperature of 25°C. After drying and weighing, the sample was soaked in water again, removed and the surface moisture was wiped off. The percentage increase in mass was calculated. The test standard is GB / T17657-2013. For flame retardant testing, under a nitrogen-oxygen mixture with an initial oxygen concentration of 21%, the oxygen concentration is adjusted until the sample burns continuously for 3 minutes or 50 mm in length. The oxygen index is then calculated, and the test standard is GB / T2406.2-2009. Strength testing was conducted using a universal testing machine, in accordance with GB / T1936.1-2009 "Test Method for Bending Strength of Wood".

[0054] The test data of the insulating laminated wood prepared in Examples 1-3 and Comparative Examples 1-4 are recorded in the table below: Comparison and analysis of the data in the table show that the multilayer insulating laminated wood prepared using processes 1-3 exhibits significantly superior performance compared to the multilayer insulating laminated wood prepared using processes 1-4. This indicates that the isocyanate resin in the impregnation solution contains highly active isocyanate groups, which react with the hydroxyl groups in the wood fibers during hot pressing and curing to form stable carbamate bonds, significantly reducing the polarity of the wood substrate. The epoxy resin, through the ring-opening reaction of the epoxy groups, further crosslinks with the residual hydroxyl groups of the isocyanate resin, forming a three-dimensional interpenetrating network structure. This effectively seals the pores of the wood fibers, blocking internal ion migration paths and thus improving insulation. Simultaneously, the ceramic particles in the functional additives, after plasma treatment, exhibit enhanced surface activity, forming a stronger interfacial bond with the resin matrix, reducing microcracks and voids at the interface, avoiding the risk of breakdown caused by localized electric field concentration, and strengthening the insulation effect. During pretreatment, the silanol groups at one end of the organosilicon waterproofing agent in the degreasing solution readily react with the abundant hydroxyl groups on the surface of birch wood fibers. The chemical reaction creates strong chemical bonds, and after the reaction, the hydrophobic organic groups on the other end of the silicone waterproofing agent align outwards, constructing a continuous and tight waterproof protective film on the surface of the wood fibers. Simultaneously, during hot pressing, water glass intertwines and reacts with the wood fibers and ceramic particles in the functional additives, building a complex cemented network structure. This further seals the original pores within the wood, significantly reducing the channels for moisture entry, making it difficult for moisture to penetrate the material. This, combined with the protective film formed earlier by the silicone waterproofing agent, comprehensively enhances the waterproof performance of the multi-layered insulating laminated wood. In the flame-retardant treatment step, magnesium hydroxide, as the core flame-retardant component, decomposes and absorbs a large amount of heat when heated, effectively reducing the surface temperature of the wood fiber sheets and inhibiting combustion from the source. Meanwhile, the ceramic particles in the functional additives, after special treatment, possess high melting points and thermal stability, providing stable support for the flame-retardant system during combustion. Together with the flame-retardant additives, this comprehensively improves the flame-retardant performance of the multi-layered insulating laminated wood.

[0055] By comparing and analyzing the relevant data in the table, it can be seen that the multi-layer insulating laminated wood prepared by the molding process of this invention not only has good electrical insulation, flame retardancy, and water resistance, but also demonstrates that the multi-layer insulating laminated wood manufacturing process provided by this invention has a broader market prospect and is more suitable for promotion.

[0056] In the description of this specification, references to terms such as "an embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A manufacturing process for multi-layer insulating laminated wood, characterized in that, Includes the following steps: Step 1: Pretreatment. Select birch wood fiber sheets with a thickness of 0.2-0.4 mm, and degrease, clean, and dry them. Step 2: Flame retardant treatment. Apply flame retardant solvent 1-3 times to the surface of the pretreated birch fiber sheet using a spraying device. Step 3: Preparation of impregnation solution; the impregnation solution is prepared. Step 4: Impregnation treatment. The flame-retardant birch fiber sheets are placed in the impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated birch fiber sheets are stacked layer by layer and cured and shaped using a hot press to obtain a multi-layered insulating laminated wood. In step three, the impregnation solution is made from the following raw materials in parts by weight: 60-70 parts isocyanate resin, 15-20 parts epoxy resin, 10-15 parts water glass, 5-10 parts functional additives, and 5-10 parts flame retardant additives.

2. The manufacturing process of multi-layer insulating laminated wood according to claim 1, characterized in that, The pretreatment includes the following steps: immersing birch fiber sheets in a stainless steel container containing degreasing solution at room temperature for 0.5-1 hour, stirring with a stirrer at 50-100 r / min during the immersion process, removing the sheets after immersion, rinsing them with running water for 5-10 minutes, and then air-drying them at room temperature.

3. The manufacturing process of multi-layer insulating laminated wood according to claim 2, characterized in that, The degreasing solution is composed of ethanol and an organosilicon waterproofing agent, wherein the mass ratio of the organosilicon waterproofing agent to ethanol is 2:9, the concentration of ethanol is 95%, and the concentration of the organosilicon waterproofing agent is 10%-20%, wherein the organosilicon waterproofing agent is either methylsilane or ethylsilane.

4. The manufacturing process of multi-layer insulating laminated wood according to claim 1, characterized in that, The flame retardant solvent in step two is prepared by the following steps: selecting magnesium hydroxide, water and dispersant, adding magnesium hydroxide, water and dispersant to a stirring device, and stirring at 500-1000 r / min for 20-30 min to complete the preparation of the flame retardant solvent. The spraying pressure of the spraying device is 0.2-0.5 MPa and the spraying speed is 10-30 cm / s.

5. The manufacturing process of multi-layer insulating laminated wood according to claim 4, characterized in that, The mass ratio of magnesium hydroxide, water, and dispersant is 2.5:7.5:0.03, and the dispersant is polyvinylpyrrolidone.

6. The manufacturing process of multi-layer insulating laminated wood according to claim 1, characterized in that, The functional additive is prepared by the following method: waste ceramic fibers are collected from a ceramic processing workshop, sorted, and then washed in a drum washing machine for 30-60 minutes. Afterward, they are placed in an oven and dried at 80-100℃ for 2-4 hours. After drying, they are removed, crushed, ground, and sieved to obtain ceramic particles with a particle size of 80-100 micrometers. The ceramic particles are then evenly distributed in a reaction chamber, and a vacuum chamber is used to achieve a vacuum degree of 1×10⁻⁶. -1 ~1×10 -3 The process involves continuously injecting nitrogen gas at 10-50 sccm and using a plasma generator with a power of 300-700 W for 7-15 minutes, after which the plasma is removed to complete the preparation of the functional additive.

7. The manufacturing process of multi-layer insulating laminated wood according to claim 1, characterized in that, The impregnation solution is prepared by adding isocyanate resin and epoxy resin to a temperature-controlled stirring device, controlling the temperature at 20-30℃, stirring at 200-500 r / min for 10-16 min, adding water glass, and continuing to stir for 10-15 min, finally adding functional additives and flame retardant additives, increasing the speed to 500-1000 r / min, and stirring for 20-30 min to complete the preparation of the impregnation solution.

8. The manufacturing process of multi-layer insulating laminated wood according to claim 1, characterized in that, The impregnation process includes the following steps: immersing birch wood fiber chips in an impregnation tank containing impregnation solution and allowing them to stand for 2-3 hours. During the standing process, the stirrer is started every 10-20 minutes and stirred at a speed of 30-60 r / min for 5-10 minutes to complete the impregnation process.

9. The manufacturing process of multi-layer insulating laminated wood according to claim 1, characterized in that, The flame retardant additive is at least one of melamine cyanurate, red phosphorus, or zinc borate.

10. The manufacturing process of multi-layer insulating laminated wood according to claim 1, characterized in that, In step five, the temperature of the hot press during hot pressing is set to 150℃±5℃, the pressure is set to 10MPa±0.5MPa, and the curing time is 2h.

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