Material for improving thermal insulation performance of wooden door and preparation method of material

Abstract

The invention relates to the technical field of wooden door manufacturing, and provides a material for improving the thermal insulation performance of a wooden door, which comprises: an inorganic thermal insulation filler which adopts a composite fiber-porous particle system and forms a three-dimensional interlaced thermal insulation skeleton by using modified glass fiber, sepiolite fiber and expanded perlite, the modified glass fibers are E-grade long glass fibers subjected to compound modification by a strong base-silane coupling agent; the organic bonding base material adopts an environment-friendly regenerated polymer and is used for wrapping the inorganic thermal insulation filler; the composite cross-linking agent is formed by compounding bis (tert-butylperoxy isopropyl) benzene and triallyl isocyanurate according to the mass ratio of 2: 1, and is used for enhancing the cross-linking density of an organic phase. Heat preservation and light weight collaborative optimization is achieved through the material, interface bonding is tight, the mechanical property is excellent, and layering and damage are not likely to happen. The material is environment-friendly, free of harmful release, simple and convenient in preparation process, low in energy consumption, high in adaptability, capable of being accurately attached to the wooden door, capable of remarkably improving the thermal insulation and energy saving effects of the wooden door and good in durability.

Description

Technical Field

[0001] This invention relates to the field of wooden door manufacturing technology, specifically to a material for increasing the thermal insulation performance of wooden doors and its preparation method. Background Technology

[0002] As a key component in building decoration and energy conservation, the thermal insulation performance of wooden doors directly affects the stability of the indoor thermal environment and building energy consumption. With the popularization of green building concepts, consumers' demand for thermal insulation in wooden doors continues to increase, especially in cold regions and energy-efficient buildings, where insulated wooden doors have become a core product requirement. Insulation materials, as the core carrier of the thermal insulation performance of wooden doors, directly determine the energy-saving effect and user experience of the doors.

[0003] Currently, insulation materials used for wooden doors are mainly divided into two categories: one is traditional inorganic insulation materials, such as ordinary glass fiber, expanded perlite, and aluminum silicate fiber, which form an insulation layer by filling the wooden door's interlayer; the other is organic-inorganic composite insulation materials, which are formed by mixing glass fiber with polymers such as polyethylene and polypropylene. In existing technologies, some solutions prepare insulation materials by simply mixing inorganic fibers and polymers, or by using a single cross-linking agent to improve the material's formability, and then embedding the insulation material inside the wooden door to achieve the insulation function.

[0004] Existing wood door insulation materials generally suffer from the problem of difficulty in achieving both insulation performance and lightweight characteristics. Furthermore, the inorganic filler and organic substrate have poor interfacial compatibility, which easily leads to delamination and peeling. They also lack mechanical strength and durability, making them prone to damage during processing and use. In addition, some materials are not environmentally friendly, have complex manufacturing processes, and consume a lot of energy, making it difficult to meet the actual needs of wood door high-efficiency insulation, safety and environmental protection, and industrialized production. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a material and its preparation method for enhancing the thermal insulation performance of wooden doors. This solves the problem that existing wooden door insulation materials generally suffer from difficulty in simultaneously achieving both thermal insulation performance and lightweight characteristics. Furthermore, the inorganic filler and organic substrate have poor interfacial compatibility, leading to delamination and peeling. They also suffer from insufficient mechanical strength and durability, making them prone to damage during processing and use. Additionally, some materials have poor environmental performance, complex preparation processes, and high energy consumption, making it difficult to meet the actual needs of efficient thermal insulation, safety, environmental protection, and industrialized production of wooden doors.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a material for increasing the thermal insulation performance of wooden doors, comprising: The inorganic thermal insulation filler adopts a composite fiber-porous particle system, and is composed of modified glass fiber, sepiolite fiber and expanded perlite, which form a three-dimensional interwoven thermal insulation skeleton. The modified glass fiber is an E-grade long glass fiber modified by a strong alkali-silane coupling agent. Organic adhesive substrate, which uses environmentally friendly recycled polymers, is used to encapsulate inorganic thermal insulation fillers; The composite crosslinking agent is composed of bis-tert-butylperoxyisopropylbenzene and triallyl isocyanurate in a mass ratio of 2:1, and is used to enhance the crosslinking density of the organic phase. Modifying agents include polyvinyl alcohol, composite cellulose, modified diatomaceous earth, and magnesium oxide; Composed of the following raw materials in parts by weight: 25-35 parts modified glass fiber, 18-25 parts sepiolite fiber, 12-22 parts expanded perlite, 8-12 parts recycled HDPE, 3-6 parts composite crosslinking agent, 10-15 parts polyvinyl alcohol, 5-8 parts modified diatomaceous earth, 6-10 parts composite cellulose, 3-6 parts magnesium oxide, and 250-550 parts deionized water.

[0007] Preferably, the expanded perlite has an expansion ratio of 6-8 times and a particle size of 60-80μm; the recycled HDPE is an environmentally friendly recycled material after high-pressure polyethylene film recycling and granulation, with a melt flow rate of 2.5-3.0g / 10min.

[0008] Preferably, the composite cellulose is a mixture of hydroxymethyl cellulose and hydroxyethyl cellulose in a 1:1 mass ratio, and the modified diatomaceous earth is diatomaceous earth surface-modified with 3-aminopropyltriethoxysilane, having a specific surface area ≥85 m². 2 / g.

[0009] Preferably, the modified glass fiber is prepared by: Add half a volume of deionized water to E-grade long glass fiber and boil for 9-11 minutes. After filtration and drying, soak it in polyvinyl alcohol solution for 11-13 hours. After drying, add strong alkali, magnesium oxide and silane coupling agent, keep warm at 215-225℃ for 22-24 minutes, filter and dry to constant weight to obtain the final product.

[0010] A method for preparing a material to increase the thermal insulation performance of wooden doors includes the following steps: Step 1: Dry and remove water and impurities from the inorganic thermal insulation filler to ensure the purity and dryness of the raw materials; purify the modified glass fiber by filtration to remove residual impurities and unreacted additives from the surface. Step 2: Add the pretreated inorganic thermal insulation filler and organic binder to a mixer, heat to 110-120℃ and plasticize and mix for 15-20 minutes to ensure initial uniform mixing of all components. Then add the composite crosslinking agent and modifying additives, continue heating to 125-135℃ and continue mixing for 20-25 minutes to promote full reaction and dispersion between components. Discharge the material. Step 3: Add deionized water to the material from Step 2 at a rate of 5-8 mL / min, stir and dissolve in a water bath at 50-60℃, heat to 110-120℃ and hold at that temperature until it reaches a molten state, hold for 10-15 min, eliminate air bubbles in the melt by stirring and vacuum treatment to ensure that the melt is uniform and dense, and hold for 10-15 min. Step 4: Feed the molten material into the screw extruder and extrude it through the die at 130-140℃ to form a sheet with a thickness controlled at 1.5-3.0mm; Step 5: The extruded board is subjected to gradient cooling. After cooling, it is cut and punched to obtain the finished insulation material suitable for wooden door installation.

[0011] Preferably, the modified glass fiber is filtered at least 5 times in step one.

[0012] Preferably, in step two, the rotor speed of the internal mixer is 40-60 r / min, and by controlling the rotor speed and mixing temperature, deep mixing and full plasticization of each component are achieved, avoiding local agglomeration or uneven dispersion.

[0013] Preferably, the stirring process in step three uses high-speed stirring with a stirring rate of 80-100 r / min to ensure that the deionized water and the material are fully mixed. Vacuum degassing is performed in the molten state for 5-8 min.

[0014] Preferably, in step four, the screw speed of the screw extruder is 30-50 r / min, the die head temperature is 135-145℃, and the barrel temperature of the screw extruder is set in three sections: zone one 125-130℃, zone two 130-135℃, and zone three 135-140℃.

[0015] Preferably, the cooling in step five adopts a gradient cooling method, first cooling at 60°C for 10 minutes, and then cooling at 25°C to room temperature, with a total cooling time of ≤20 hours.

[0016] This invention provides a material for increasing the thermal insulation performance of wooden doors and a method for preparing the same. It offers the following advantages: 1. This invention, through the synergistic formulation of modified glass fiber, sepiolite fiber, and expanded perlite, combined with the cross-linking effect of a composite cross-linking agent, improves the thermal insulation performance compared to traditional materials, while maintaining a bulk density of only 0.25-0.35 g / cm³. 3 It reduces weight compared to traditional materials with the same insulation effect.

[0017] 2. The modified glass fiber of this invention is modified by a strong alkali-silane coupling agent, which greatly improves the interfacial compatibility with the organic phase; the composite cellulose and the composite crosslinking agent form a three-dimensional network structure, which firmly fixes the inorganic filler, and the internal pores of the material are evenly distributed, avoiding delamination and shedding. After immersion in water at room temperature for 72 hours, the thermal insulation performance decays less, and the durability is significantly improved.

[0018] 3. The synergistic effect of the composite crosslinking agent and modified diatomaceous earth in this invention improves the compressive strength of the material, which is significantly higher than that of traditional insulation materials. The toughness is also significantly improved, and the material can withstand minor impacts during the processing and transportation of wooden doors without easily breaking, thus ensuring the overall structural stability of the wooden door.

[0019] 4. The application of recycled HDPE and modified inorganic fillers in the raw materials of this invention conforms to the concept of green environmental protection. The preparation process adopts gradient mixing and vacuum degassing process, which reduces energy consumption compared with traditional process, and the molding process is easy to control, which is convenient for industrial production.

[0020] 5. The material of this invention has excellent heat insulation, water resistance and anti-aging properties, and can be used stably in environments ranging from -20℃ to 60℃, making it suitable for wooden door products in different climate zones. Detailed Implementation

[0021] 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.

[0022] As one aspect of the present invention, an embodiment of the present invention provides a material for increasing the thermal insulation performance of wooden doors. By weight, the raw material composition includes: 28-32 parts modified glass fiber, 20-23 parts sepiolite fiber, 15-18 parts expanded perlite, 9-11 parts recycled HDPE, 4-5 parts composite crosslinking agent, 12-14 parts polyvinyl alcohol, 6-7 parts modified diatomaceous earth, 7-9 parts composite cellulose, 4-5 parts magnesium oxide, and 300-450 parts deionized water. The modified glass fiber is a grade E long glass fiber modified by a strong alkali-silane coupling agent; the composite crosslinking agent is a mixture of bis-tert-butylperoxyisopropylbenzene and triallyl isocyanurate in a mass ratio of 2:1; the expanded perlite has an expansion ratio of 6-8 times and a particle size of 60-80 μm; the recycled HDPE is an environmentally friendly recycled material after high-pressure polyethylene film recycling and granulation, with a melt flow rate of 2.5-3.0 g / 10 min; the composite cellulose is a mixture of hydroxymethyl cellulose and hydroxyethyl cellulose in a mass ratio of 1:1; the modified diatomaceous earth is diatomaceous earth surface-modified with 3-aminopropyltriethoxysilane, with a specific surface area ≥85 m². 2 / g.

[0023] The modified glass fiber is prepared by adding half a volume of deionized water to E-grade long glass fiber and boiling it for 9-11 minutes. After filtration and drying, it is soaked in polyvinyl alcohol solution for 11-13 hours. After drying, strong alkali, magnesium oxide and silane coupling agent are added, and the mixture is kept at 215-225℃ for 22-24 minutes. After filtration and drying to constant weight, the modified glass fiber is obtained.

[0024] As another aspect of the present invention, the preparation method of the above-mentioned material for increasing the thermal insulation performance of wooden doors is as follows: including the following steps: Step 1: Dry the inorganic thermal insulation filler at 105℃ for 2-3 hours to remove water. Purify the modified glass fiber by vacuum filtration, with no less than 5 filtrations to ensure thorough removal of surface impurities. The moisture content after drying should be ≤0.5%. Step 2: Add the pretreated inorganic thermal insulation filler and organic binder to a Banbury mixer, heat to 112-118℃, and mix at a rotor speed of 45-55 r / min for 16-18 min; then add the composite crosslinking agent and modifying agent, heat to 128-132℃, and continue mixing for 22-24 min, then discharge the material; the mixing process in the Banbury mixer adopts a segmented pressurization mode, with an initial pressure of 0.3 MPa, and after heating to 120℃, the pressure is increased to 0.5 MPa to ensure uniform mixing of components; Step 3: Add the composite cellulose and remaining deionized water to the material from Step 2, and dissolve them by stirring at a rate of 85-95 r / min in a water bath at 52-58℃. The deionized water should be added at a rate of 5-8 mL / min to avoid clumping. Heat the material to 112-118℃ and hold it at that temperature until it reaches a molten state, then hold for 12-14 min. In the molten state, perform vacuum degassing treatment with a vacuum degree ≤-0.09 MPa and a degassing time of 6-7 min. Step 4: Feed the molten material into the screw extruder. The barrel temperature of the screw extruder is set in three sections: Zone 1 125-130℃, Zone 2 130-135℃, and Zone 3 135-140℃. The screw speed is 35-45 r / min, and the die head temperature is 138-142℃. Extrusion is carried out at 132-138℃ to form a film, and the film thickness is controlled at 2.0-2.5 mm. Step 5: The extruded film is cooled using a gradient cooling method, first at 60℃ for 10 minutes, and then at 25℃ to room temperature, with a total cooling time of ≤18h; after high-precision cutting and punching, the cutting accuracy is controlled within ±0.1mm, the edges of the punched finished product are free of burrs, and the flatness error is ≤0.2mm, thus obtaining the finished insulation material suitable for wooden doors.

[0025] To better illustrate the implementation scheme of the material and preparation method for increasing the thermal insulation performance of wooden doors according to the present invention, the following examples are provided: Example 1: A material for increasing the thermal insulation performance of wooden doors, by weight, comprises the following raw materials: 28 parts modified glass fiber, 20 parts sepiolite fiber, 15 parts expanded perlite, 9 parts recycled HDPE, 4 parts composite crosslinking agent, 12 parts polyvinyl alcohol, 6 parts modified diatomaceous earth, 7 parts composite cellulose, 4 parts magnesium oxide, and 300 parts deionized water. The modified glass fiber is a grade E long glass fiber modified by a strong alkali-silane coupling agent. The preparation method is as follows: add half a volume of deionized water to the grade E long glass fiber and boil it for 9 minutes. After filtering and drying, soak it in a polyvinyl alcohol solution for 11 hours. After drying, add a strong alkali, magnesium oxide and silane coupling agent, keep it at 215°C for 22 minutes, filter and dry it to constant weight. The composite crosslinking agent is a mixture of bis-tert-butylperoxyisopropylbenzene and triallyl isocyanurate in a mass ratio of 2:1; the expanded perlite has an expansion ratio of 6 times and a particle size of 60 μm; the recycled HDPE has a melt flow rate of 2.5 g / 10 min; the composite cellulose is a mixture of hydroxymethyl cellulose and hydroxyethyl cellulose in a mass ratio of 1:1; and the modified diatomaceous earth has a specific surface area ≥85 m². 2 / g.

[0026] Its preparation method includes the following steps: Step 1: The inorganic thermal insulation filler was dried at 105℃ for 2 hours to remove water. The modified glass fiber was purified by vacuum filtration, which was repeated 5 times. The moisture content after drying was 0.4%. Step 2: Add the pretreated inorganic thermal insulation filler and organic binder to a mixer, heat to 112℃, and mix at a rotor speed of 45r / min for 16min; then add the composite crosslinking agent and modifying agent, heat to 128℃, and continue mixing for 22min, then discharge the material; the mixing process adopts a segmented pressurization mode, with an initial pressure of 0.3MPa, and after heating to 120℃, the pressure is increased to 0.5MPa; Step 3: Add composite cellulose and remaining deionized water to the material from Step 2, and stir to dissolve in a 52℃ water bath at a rate of 85r / min. The deionized water is added at a rate of 5mL / min. Heat to 112℃ and hold at that temperature until the material is in a molten state for 12min. In the molten state, perform vacuum degassing treatment with a vacuum degree ≤-0.09MPa and a degassing time of 6min. Step 4: Feed the molten material into the screw extruder. The barrel temperature is 125℃ in zone 1, 130℃ in zone 2, and 135℃ in zone 3. The screw speed is 35r / min, the die head temperature is 138℃, and the film is extruded at 132℃ with a film thickness of 2.0mm. Step 5: The extruded film is cooled using a gradient cooling method, first at 60℃ for 10 minutes, then at 25℃ to room temperature, for a total cooling time of 15 hours; after high-precision cutting and punching, the cutting accuracy is ±0.1mm, the edges of the punched finished product are burr-free, and the flatness error is ≤0.2mm, thus obtaining the finished insulation material suitable for wooden doors.

[0027] Example 2: A material for increasing the thermal insulation performance of wooden doors, by weight, comprises the following raw materials: 30 parts modified glass fiber, 22 parts sepiolite fiber, 16 parts expanded perlite, 10 parts recycled HDPE, 4.5 parts composite crosslinking agent, 13 parts polyvinyl alcohol, 6.5 parts modified diatomaceous earth, 8 parts composite cellulose, 4.5 parts magnesium oxide, and 380 parts deionized water. The modified glass fiber is an E-grade long glass fiber modified by a strong alkali-silane coupling agent. The preparation method is as follows: the E-grade long glass fiber is boiled in half a volume of deionized water for 10 minutes, filtered and dried, then soaked in a polyvinyl alcohol solution for 12 hours, dried, and then a strong alkali, magnesium oxide and silane coupling agent are added. The mixture is kept at 220°C for 23 minutes, filtered and dried to constant weight. The composite crosslinking agent is a mixture of bis-tert-butylperoxyisopropylbenzene and triallyl isocyanurate in a mass ratio of 2:1; the expanded perlite has an expansion ratio of 7 times and a particle size of 70 μm; the recycled HDPE has a melt flow rate of 2.8 g / 10 min; the composite cellulose is a mixture of hydroxymethyl cellulose and hydroxyethyl cellulose in a mass ratio of 1:1; and the modified diatomaceous earth has a specific surface area ≥85 m². 2 / g.

[0028] Its preparation method includes the following steps: Step 1: The inorganic thermal insulation filler was dried at 105℃ for 2.5 hours to remove water. The modified glass fiber was purified by vacuum filtration, which was repeated 5 times. After drying, the moisture content was 0.3%. Step 2: Add the pretreated inorganic thermal insulation filler and organic binder to a mixer, heat to 115℃, and mix at a rotor speed of 50r / min for 17min; then add the composite crosslinking agent and modifying agent, heat to 130℃, and continue mixing for 23min, then discharge the material; the mixing process adopts a segmented pressurization mode, with an initial pressure of 0.3MPa, and after heating to 120℃, the pressure is increased to 0.5MPa; Step 3: Add composite cellulose and remaining deionized water to the material from Step 2, and dissolve them by stirring at a rate of 90 r / min in a 55℃ water bath. The deionized water is added at a rate of 6.5 mL / min. Heat to 115℃ and hold at that temperature until the material is in a molten state for 13 min. In the molten state, perform vacuum degassing treatment with a vacuum degree ≤ -0.09 MPa and a degassing time of 6.5 min. Step 4: Feed the molten material into the screw extruder. The barrel temperature is 128℃ in zone 1, 133℃ in zone 2, and 138℃ in zone 3. The screw speed is 40r / min, the die head temperature is 140℃, and the film is extruded at 135℃ with a film thickness of 2.2mm. Step 5: The extruded film is cooled using a gradient cooling method, first at 60℃ for 10 minutes, then at 25℃ to room temperature, for a total cooling time of 16 hours; after high-precision cutting and punching, the cutting accuracy is ±0.1mm, the edges of the punched finished product are burr-free, and the flatness error is ≤0.2mm, thus obtaining the finished insulation material suitable for wooden doors.

[0029] Example 3: A material for increasing the thermal insulation performance of wooden doors, by weight, comprises the following raw materials: 32 parts modified glass fiber, 23 parts sepiolite fiber, 18 parts expanded perlite, 11 parts recycled HDPE, 5 parts composite crosslinking agent, 14 parts polyvinyl alcohol, 7 parts modified diatomaceous earth, 9 parts composite cellulose, 5 parts magnesium oxide, and 450 parts deionized water. The modified glass fiber is an E-grade long glass fiber modified by a strong alkali-silane coupling agent. The preparation method is as follows: the E-grade long glass fiber is added to half a volume of deionized water and boiled for 11 minutes. After filtration and drying, it is soaked in a polyvinyl alcohol solution for 13 hours. After drying, a strong alkali, magnesium oxide and silane coupling agent are added. The mixture is kept at 225°C for 24 minutes and then filtered and dried to constant weight. The composite crosslinking agent is a mixture of bis-tert-butylperoxyisopropylbenzene and triallyl isocyanurate in a mass ratio of 2:1; the expanded perlite has an expansion ratio of 8 times and a particle size of 80 μm; the recycled HDPE has a melt flow rate of 3.0 g / 10 min; the composite cellulose is a mixture of hydroxymethyl cellulose and hydroxyethyl cellulose in a mass ratio of 1:1; and the modified diatomaceous earth has a specific surface area ≥85 m². 2 / g.

[0030] Its preparation method includes the following steps: Step 1: The inorganic thermal insulation filler was dried at 105℃ for 3 hours to remove water. The modified glass fiber was purified by vacuum filtration, which was repeated 6 times. The moisture content after drying was 0.2%. Step 2: Add the pretreated inorganic thermal insulation filler and organic binder to a mixer, heat to 118℃, and mix at a rotor speed of 55r / min for 18min; then add the composite crosslinking agent and modifying agent, heat to 132℃, and continue mixing for 24min, then discharge the material; the mixing process adopts a segmented pressurization mode, with an initial pressure of 0.3MPa, and after heating to 120℃, the pressure is increased to 0.5MPa; Step 3: Add composite cellulose and remaining deionized water to the material from Step 2, and stir to dissolve in a 58℃ water bath at a rate of 95 r / min. The deionized water is added at a rate of 8 mL / min. Heat to 118℃ and hold at that temperature until the material is in a molten state for 14 min. In the molten state, perform vacuum degassing treatment with a vacuum degree ≤ -0.09 MPa and a degassing time of 7 min. Step 4: Feed the molten material into the screw extruder. The barrel temperature is 130℃ in zone 1, 135℃ in zone 2, and 140℃ in zone 3. The screw speed is 45r / min, the die head temperature is 142℃, and the material is extruded into a film at 138℃ with a film thickness of 2.5mm. Step 5: The extruded film is cooled using a gradient cooling method, first at 60℃ for 10 minutes, then at 25℃ to room temperature, for a total cooling time of 18 hours; after high-precision cutting and punching, the cutting accuracy is ±0.1mm, the edges of the punched finished product are burr-free, and the flatness error is ≤0.2mm, thus obtaining the finished insulation material suitable for wooden doors.

[0031] Experimental example: Four sets of wooden doors of the same specifications were selected, and the insulation materials prepared in Examples 1-3 and traditional glass fiber insulation materials were embedded in them respectively for comparison. The insulation performance, mechanical properties and durability were tested, and the test results are shown in the table below:

[0032] The results show that the material prepared in this invention for improving the thermal insulation performance of wooden doors has a thermal conductivity ≤0.030W / (m・K), and its thermal insulation performance is improved by more than 21% compared with traditional materials; its bulk density is only 0.28-0.32g / cm³. 3 The weight is reduced by more than 15%; the compressive strength is ≥0.90MPa, and the mechanical properties are better; the thermal insulation performance decreases by ≤3.0% after humid heat aging, and the durability is strong. The finished product has high flatness and can be precisely fitted with wooden doors, effectively improving the thermal insulation and energy-saving effect of wooden doors.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A material for increasing the thermal insulation performance of wooden doors, characterized in that, include: The inorganic thermal insulation filler adopts a composite fiber-porous particle system, and is composed of modified glass fiber, sepiolite fiber and expanded perlite, which form a three-dimensional interwoven thermal insulation skeleton. The modified glass fiber is an E-grade long glass fiber modified by a strong alkali-silane coupling agent. Organic adhesive substrate, which uses environmentally friendly recycled polymers, is used to encapsulate inorganic thermal insulation fillers; The composite crosslinking agent is composed of bis-tert-butylperoxyisopropylbenzene and triallyl isocyanurate in a mass ratio of 2:1, and is used to enhance the crosslinking density of the organic phase. Modifying agents include polyvinyl alcohol, composite cellulose, modified diatomaceous earth, and magnesium oxide; Composed of the following raw materials in parts by weight: 25-35 parts modified glass fiber, 18-25 parts sepiolite fiber, 12-22 parts expanded perlite, 8-12 parts recycled HDPE, 3-6 parts composite crosslinking agent, 10-15 parts polyvinyl alcohol, 5-8 parts modified diatomaceous earth, 6-10 parts composite cellulose, 3-6 parts magnesium oxide, and 250-550 parts deionized water.

2. The material for increasing the thermal insulation performance of wooden doors according to claim 1, characterized in that, The expanded perlite has an expansion ratio of 6-8 times and a particle size of 60-80μm; the recycled HDPE is an environmentally friendly recycled material after high-pressure polyethylene film recycling and granulation, with a melt flow rate of 2.5-3.0g / 10min.

3. The material for increasing the thermal insulation performance of wooden doors according to claim 1, characterized in that, The composite cellulose is composed of hydroxymethyl cellulose and hydroxyethyl cellulose in a mass ratio of 1:1, and the modified diatomaceous earth is diatomaceous earth that has undergone surface modification treatment with 3-aminopropyltriethoxysilane, with a specific surface area ≥85m². 2 / g.

4. The material for increasing the thermal insulation performance of wooden doors according to claim 1, characterized in that, The method for preparing the modified glass fiber is as follows: Add half a volume of deionized water to E-grade long glass fiber and boil for 9-11 minutes. After filtration and drying, soak it in polyvinyl alcohol solution for 11-13 hours. After drying, add strong alkali, magnesium oxide and silane coupling agent, keep warm at 215-225℃ for 22-24 minutes, filter and dry to constant weight to obtain the final product.

5. A method for preparing a material to enhance the thermal insulation performance of wooden doors, comprising using the material for enhancing the thermal insulation performance of wooden doors as described in any one of claims 1-4, characterized in that, Includes the following steps: Step 1: Dry and remove water and impurities from the inorganic thermal insulation filler to ensure the purity and dryness of the raw materials; purify the modified glass fiber by filtration to remove residual impurities and unreacted additives from the surface. Step 2: Add the pretreated inorganic thermal insulation filler and organic binder to a mixer, heat to 110-120℃ and plasticize and mix for 15-20 minutes to ensure initial uniform mixing of all components. Then add the composite crosslinking agent and modifying additives, continue heating to 125-135℃ and continue mixing for 20-25 minutes to promote full reaction and dispersion between components. Discharge the material. Step 3: Add deionized water to the material from Step 2 at a rate of 5-8 mL / min, stir and dissolve in a water bath at 50-60℃, heat to 110-120℃ and hold at that temperature until it reaches a molten state, keep it at that temperature for 10-15 min, eliminate air bubbles in the melt by stirring and vacuum treatment to ensure that the melt is uniform and dense, and keep it at that temperature for 10-15 min. Step 4: Feed the molten material into the screw extruder and extrude it through the die at 130-140℃ to form a sheet with a film thickness controlled at 1.5-3.0mm; Step 5: The extruded board is subjected to gradient cooling. After cooling, it is cut and punched to obtain the finished insulation material suitable for wooden door installation.

6. A method for preparing a material to increase the thermal insulation performance of wooden doors according to claim 5, characterized in that, In step one, the modified glass fiber is filtered no less than 5 times.

7. A method for preparing a material to increase the thermal insulation performance of wooden doors according to claim 5, characterized in that, In step two, the rotor speed of the internal mixer is 40-60 r / min. By controlling the rotor speed and mixing temperature, deep mixing and full plasticization of each component are achieved, avoiding local agglomeration or uneven dispersion.

8. A method for preparing a material to increase the thermal insulation performance of wooden doors according to claim 5, characterized in that, In step three, the stirring process adopts high-speed stirring with a stirring rate of 80-100 r / min to ensure that the deionized water and the material are fully mixed. Vacuum degassing is performed in the molten state for 5-8 min.

9. A method for preparing a material to increase the thermal insulation performance of wooden doors according to claim 5, characterized in that, In step four, the screw speed of the screw extruder is 30-50 r / min, the die head temperature is 135-145℃, and the barrel temperature of the screw extruder is set in three sections: zone one 125-130℃, zone two 130-135℃, and zone three 135-140℃.

10. A method for preparing a material to increase the thermal insulation performance of wooden doors according to claim 5, characterized in that, In step five, a gradient cooling method is used: first, cooling at 60°C for 10 minutes, and then cooling at 25°C to room temperature, with a total cooling time of ≤20 hours.

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