Double-cover damping wooden soundproof door preparation process and product thereof

Abstract

The invention discloses a double-cover damping wooden soundproof door preparation process and a product thereof, and belongs to the technical field of architectural acoustics and wooden composites.The double-cover damping wooden soundproof door preparation process comprises the following steps that core material preparation is conducted, specifically, a door frame is made of laminated timber, and an I-shaped keel frame is arranged in the door frame; egg cotton sound insulation layers with different densities are sequentially filled at intervals of the keel frame from the center to the edge of the door body, and the densities of the egg cotton sound insulation layers are gradually increased; preparing a surface layer: sequentially bonding the panel layer, the first sound insulation sealant layer, the density board buffer layer and the second sound insulation sealant layer through a staged variable-pressure cold pressing process; surface treatment is conducted, specifically, paint coating is conducted on the panel layer; wear-resistant sound-insulation edge sealing cotton is installed on the upper side and the lower side of the door body. Through the combined design of the I-shaped keel frame and the egg cotton and the structure of the laminated wood door frame and the double sealing rubber layers, the insulation effect on low-frequency noise such as footstep sound is remarkably improved, and the problems that a traditional sound insulation door is prone to deformation and poor in sealing performance are solved.

Description

Technical Field

[0001] The present invention relates to the fields of architectural acoustics and wood composite materials, and specifically to a wooden door that achieves efficient sound insulation through innovative structural design and material combination, and a preparation method thereof. The wooden door is suitable for architectural spaces such as residences and offices that have high requirements for the acoustic environment. Background Art

[0002] China's current urbanization rate is approximately 65.2%, and by 2050, it could reach 80%. With the advancement of urbanization, noise pollution from transportation, industry, construction, and daily life is becoming a serious problem. Furthermore, the increasing pressures of daily life, work, and study have a significant negative impact on people's lives and work. The crowded and busy cities make everyone yearn for a rare sense of tranquility at home, especially as a quiet environment can calm people and maintain physical and mental health. Traditional soundproof doors are less effective at blocking low-frequency vibration noise (such as footsteps and elevator noise) and require highly specialized installers. Otherwise, noise can easily penetrate through gaps on the upper and lower sides of the door, reducing the soundproofing effect.

[0003] The present invention adds an egg cotton sound insulation layer to the core board I-shaped keel frame, makes a homemade sound insulation sealant, cooperates with a multi-layer composite sound insulation structure, and installs a redundant high sealing system to achieve the production of more efficient, lightweight, and durable shock-absorbing and sound-insulating wooden doors, meeting the needs of modern buildings for acoustic comfort. Summary of the Invention

[0004] The present invention provides a preparation process for a double-cover shock-absorbing wooden sound-insulating door and a product thereof, which effectively solves the above-mentioned technical problems through innovative structural design and material combination.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A preparation process for a double-cover shock-absorbing wooden sound-insulating door comprises the following steps: preparation of the core material: using laminated timber to make a door frame, arranging an I-shaped keel frame in the door frame, and filling the keel frame intervals with egg-wool sound insulation layers of increasing density from the center of the door body to the edge; preparation of the surface layer: sequentially bonding a panel layer, a first sound-insulating sealant layer, a density board buffer layer, and a second sound-insulating sealant layer through a staged variable pressure cold pressing process; surface treatment: painting the panel layer; and edge sealing treatment: installing wear-resistant sound-insulating edge sealing cotton on the upper and lower sides of the door body.

[0006] The present invention adopts a "I-shaped keel frame + egg sound insulation cotton" composite structure to form multiple sound wave reflection interfaces, achieving an improvement in the sound insulation amount of low-frequency noise. The acoustic interlayer composed of a double-sealing adhesive layer and a density board improves the sound insulation amount in the medium and high frequency bands. The damping characteristics of the egg cotton sound insulation layer can reduce vibration transmission, and the cavity structure of the I-shaped keel frame effectively blocks solid sound transmission. The combination of the I-shaped keel frame and the laminated wood door frame improves the flatness and bending stiffness of the door.

[0007] Preferably, the door frame is a laminated wood door frame made of multiple layers of orthogonally glued veneers. In terms of sound insulation, the high-density structure can effectively block the conduction of sound waves, and the multi-layer positive gluing structure destroys the sound wave resonance path, forming a "hard-soft-hard" acoustic impedance with the egg cotton. In terms of structure, it has good isotropy, higher dimensional stability than solid wood, excellent flatness, and good anti-deformation ability.

[0008] Preferably, the keel frame is made of pine or fir and uses an I-shaped structure to form a stable support frame, which can solve the problems of easy deformation and unstable structure of the door. The closed cavity structure blocks the sound bridge effect, and the low-frequency sound insulation amount is improved after combination with the egg cotton.

[0009] Preferably, the egg sound insulation cotton uses melamine foam material, and the sound insulation cotton with increasing density is filled in sequence from the center of the keel frame interval to the edge. The high-density foam can block medium and high-frequency sound waves, the low-density foam can enhance low-frequency damping, and the foam pore structure also improves the absorption rate of low-frequency noise. The structure also has a certain elasticity and can effectively buffer vibrations.

[0010] Preferably, the surface layer adopts a multi-layer composite design. The panel layer is a paper finish or a veneer finish decorative layer, which is beautiful and practical; the coating amount of the first sound insulation sealant layer is 145-260 g / m², enhancing the interlayer bonding and improving the sound insulation effect; the density board buffer layer uses medium density fiberboard to further block the transmission of sound waves; the second sound insulation sealant layer cooperates with the first adhesive layer to form a "sandwich" structure, enhancing the overall sound insulation performance.

[0011] Preferably, wear-resistant sound insulation edge cotton is installed on the upper and lower same sides of the door frame. It uses EPDM rubber material to enhance the sealing performance, further increasing the sound insulation effect. The integrated installation with the same color as the door frame can also ensure aesthetics.

[0012] The preparation process is as follows: (1)Core material preparation Use laminated wood to make the door frame (101) to ensure flatness and anti-deformation ability.

[0013] Configure an I-shaped keel frame (103) inside the door frame with a spacing of 30-50 mm to form a stable support.

[0014] Fill the egg cotton sound insulation layer (102) in the keel frame interval (104), with a thickness slightly less than that of the keel frame to avoid compression deformation.

[0015] (2) Surface layer lamination Adhere the panel layer (201), the first sound insulation sealant layer (202), the density board buffer layer (203) and the second sound insulation sealant layer (204) in sequence using the cold pressing process. The cold pressing is divided into two stages: The first stage: The density board buffer layer (203) is laminated with the second sound insulation sealant layer (204), with a pressure of 0.7 - 1.2 MPa and a time of 30 - 60 minutes.

[0016] The second stage: The panel layer (201) is laminated with the first sound insulation sealant layer (202), with a pressure of 0.7 - 1.2 MPa and a time of 10 - 30 minutes.

[0017] (3) Surface treatment Spray paint on the panel layer (201) to ensure a smooth surface without bubbles, improving the aesthetics and weather resistance.

[0018] (4) Edge sealing treatment Install EPDM rubber edge sealing cotton (301) on the upper and lower sides of the door body (300) to enhance the sealing performance and sound insulation effect.

[0019] The present invention has the following beneficial effects: 1. The combination of the I-shaped keel frame and the laminated wood door frame improves the flatness, and the structure is stable and not easily deformed; 2. The density gradient egg cotton (low density in the central layer and high density in the edge layer) is filled in the keel frame interval, and the layered attenuation effect of different density materials on low-frequency sound waves is used to effectively absorb low-frequency noise. The self-made sound insulation glue is combined with the multi-layer laminated structure, and the sound insulation effect is more significant; 3. The staged variable-pressure cold pressing process enables the glue layer to fully penetrate the micropores of the density board, ensuring the close fit between the panel and the glue layer, avoiding the problems of "hollow in the middle and overpressure at the edge" caused by the traditional single pressure, improving the thickness uniformity of the glue layer, and increasing the surface shear strength; 4. The compression set of the EPDM rubber edge sealing cotton ≤ 5%, combined with the same-color integrated design of the door frame, has both aesthetics and acoustic durability; 5. The overall weight is reduced compared to the traditional solid wood sound insulation door. Brief description of the drawings

[0020] Figure 1 is the exploded view of the overall structure of the present invention; Figure 2 is the schematic cross-sectional view of the core material of the present invention in the horizontal direction; Figure 3 is the schematic diagram of the structure of the door and the sound insulation edge sealing cotton of the present invention; In the figure: 100 - core material; 101 - door frame; 102a - central layer of egg sound insulation cotton; 102b - edge layer of egg sound insulation cotton; 103 - central layer of the dragon skeleton; 104 - interval of the dragon skeleton; 201 - decorative layer; 202 - first sound insulation sealant layer; 203 - density buffer board; 204 - second sound insulation sealant layer; 300 - door; 301 - wear-resistant sound insulation edge-sealing cotton. Specific implementation mode

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0022] As Figures 1-3 shown, this embodiment provides a preparation process and its product of a double-cover shock-absorbing wooden sound-insulating door, including a core material 100 and surface layers respectively arranged on both sides of the core material 100. The core material 100 is composed of a central layer of the dragon skeleton 103 and a door frame 101. The dragon skeleton adopts an I-shaped structure, and egg sound insulation cotton 102a / 102b is filled in the interval. The door frame 101 adopts laminated wood. The surface layer: from the outside to the inside are a panel layer 201, a first sound insulation sealant layer 202, a density board buffer layer 203, and a second sound insulation sealant layer 204. Wear-resistant sound insulation edge-sealing cotton 301 of the same color is installed on both the upper and lower sides of the door body 300.

[0023] Embodiment 1

[0024] (1) Core material preparation: A 25-mm-thick laminated wood door frame 101, an I-shaped dragon skeleton 103 with a spacing of 30 mm is configured, 25 kg / m³ of egg sound insulation cotton 102a is filled in the center of the dragon skeleton interval, and 40 kg / m³ of egg sound insulation cotton 102b is filled in the edge layer. The thickness of the egg cotton is 20 mm; (2) Surface layer lamination: The first stage: The density board buffer layer 203 and the second sound insulation sealant layer 204 (coating amount 145 g / m²) are cold-pressed for 30 minutes under a pressure of 0.8 MPa; The second stage: The wood veneer panel 201 and the first sound insulation sealant layer 202 (coating amount 145 g / m²) are cold-pressed for 30 minutes under a pressure of 0.8 MPa; (3) Surface treatment: Spraying paint; (4) Edge-sealing treatment: Wear-resistant sound insulation edge-sealing cotton 301 of the same color is installed on both the upper and lower sides of the door.

[0025] Embodiment 2

[0026] (1)Core material preparation: A laminated wood door frame 101 with a thickness of 50 mm, equipped with an I-shaped skeleton 103 with a spacing of 50 mm. Fill 25 kg / m³ of egg sound insulation cotton 102a in the center of the skeleton interval, and fill 40 kg / m³ of egg sound insulation cotton 102b in the edge layer. The thickness of the egg sound insulation cotton is 45 mm; (2)Face layer lamination: First stage: Cold press the density board buffer layer 203 and the second sound insulation sealant layer 204 (coating amount 260 g / m²) at a pressure of 0.7 MPa for 45 minutes; Second stage: Cold press the wood veneer 201 and the first sealant layer 202 (coating amount 260 g / m²) at a pressure of 0.7 MPa for 20 minutes; (3)Surface treatment: Spray paint; (4)Edge sealing treatment: Install the same-color wear-resistant sound insulation edge sealing cotton 301 on the upper and lower sides of the door.

[0027] Example 3

[0028] (1)Core material preparation: A laminated wood door frame 101 with a thickness of 30 mm, equipped with an I-shaped skeleton 103 with a spacing of 40 mm. Fill 25 kg / m³ of egg sound insulation cotton 102a in the center of the skeleton interval, and fill 40 kg / m³ of egg sound insulation cotton 102b in the edge layer. The thickness of the egg sound insulation cotton is 30 mm; (2)Face layer lamination: First stage: Cold press the density board buffer layer 203 and the second sound insulation sealant layer 204 (coating amount 200 g / m²) at a pressure of 1.0 MPa for 60 minutes; Second stage: Cold press the wood veneer 201 and the first sealant layer 202 (coating amount 220 g / m²) at a pressure of 0.9 MPa for 10 minutes; (3)Surface treatment: Spray paint; (4)Edge sealing treatment: Install the same-color wear-resistant sound insulation edge sealing cotton 301 on the upper and lower sides of the door.

[0029] Example 4

[0030] (1)Core material preparation: A laminated wood door frame 101 with a thickness of 25 mm, equipped with an I-shaped skeleton 103 with a spacing of 50 mm. Fill 25 kg / m³ of egg sound insulation cotton 102a in the center of the skeleton interval, and fill 40 kg / m³ of egg sound insulation cotton 102b in the edge layer. The thickness of the egg sound insulation cotton is 15 mm; (2)Face layer lamination: First stage: Cold press the density board buffer layer 203 and the second sound insulation sealant layer 204 (coating amount 200 g / m²) at a pressure of 0.8 MPa for 60 minutes; Second stage: Cold press the wood veneer panel 201 and the first sealant layer 202 (coating amount 180 g / m²) at a pressure of 0.9 MPa for 30 minutes; (3) Surface treatment: Spray paint; (4) Edge sealing treatment: Install the same-color wear-resistant and sound-insulating edge sealing cotton 301 on the upper and lower sides of the door.

[0031] Example 5

[0032] (1) Core material preparation: A 40-mm-thick laminated wood door frame 101, with an I-shaped skeleton 103 arranged at intervals of 40 mm. Fill the center of the skeleton intervals with 25 kg / m³ of egg-shaped sound-insulating cotton 102a, and fill the edge layer with 40 kg / m³ of egg-shaped sound-insulating cotton 102b. The thickness of the egg-shaped sound-insulating cotton is 35 mm; (2) Surface layer lamination: First stage: Cold press the density board buffer layer 203 and the second sound-insulating sealant layer 204 (coating amount 160 g / m²) at a pressure of 1.0 MPa for 60 minutes; Second stage: Cold press the wood veneer panel 201 and the first sealant layer 202 (coating amount 230 g / m²) at a pressure of 0.7 MPa for 30 minutes; (3) Surface treatment: Spray paint; (4) Edge sealing treatment: Install the same-color wear-resistant and sound-insulating edge sealing cotton 301 on the upper and lower sides of the door.

[0033] Comparative example 1 (1) Core material preparation: A 20-mm-thick laminated wood door frame 101, with an I-shaped skeleton 103 arranged at intervals of 40 mm. Fill the center of the skeleton intervals with 25 kg / m³ of egg-shaped sound-insulating cotton 102a, and fill the edge layer with 40 kg / m³ of egg-shaped sound-insulating cotton 102b. The thickness of the egg-shaped sound-insulating cotton is 35 mm; (2) Surface layer lamination: First stage: Cold press the density board buffer layer 203 and the second sound-insulating sealant layer 204 (using ordinary white latex, coating amount 200 g / m²) at a pressure of 1.0 MPa for 60 minutes; Second stage: Cold press the wood veneer panel 201 and the first sealant layer 202 (using ordinary white latex, coating amount 200 g / m²) at a pressure of 0.9 MPa for 10 minutes; (3) Surface treatment: Spray paint; (4) Edge sealing treatment: Do not install the wear-resistant and sound-insulating edge sealing cotton 301.

[0034] Comparative example 2 (1) Core material preparation: A 25-mm-thick laminated wood door frame 101, with an I-shaped skeleton 103 arranged at intervals of 30 mm. Do not fill the egg-shaped sound-insulating cotton in the skeleton intervals; (2) Surface layer lamination: The first stage: Cold press the density board buffer layer 203 and the second sound insulation sealant layer 204 (using ordinary white latex, coating amount 200 g / m²) for 60 minutes under a pressure of 1.0 MPa; The second stage: Cold press the wood veneer panel 201 and the first sealant layer 202 (using ordinary white latex, coating amount 200 g / m²) for 10 minutes under a pressure of 0.9 MPa; (3) Surface treatment: Spray paint; (4) Edge sealing treatment: Install the same-color wear-resistant sound insulation edge sealing cotton 301 on the upper and lower sides of the door.

[0035] Performance testing was carried out on the examples and comparative examples, including: sound insulation quantity (RW) testing, flatness testing, and surface bonding strength testing.

[0036] Sound insulation quantity (RW) testing Testing method: According to the national standard GB / T8485-2020 "Testing Method for Airborne Sound Insulation Performance of Building Doors and Windows", by measuring the sound pressure level difference on both sides of the door under laboratory conditions, calculate the standardized sound insulation quantity (Rw), with the unit of decibel (dB). The larger the value, the better the sound insulation effect.

[0037] Flatness testing Testing method: According to GB / T14012-2009 "Wood-based Panel Machinery - Hot Press" or the general testing method in the wooden door industry, press the straightedge tightly against the door surface, and use a feeler gauge to measure the maximum gap between the straightedge and the door surface. The result is expressed as "gap value (mm) / measurement length (500 mm)". The smaller the value, the flatter the door body and the stronger the anti-deformation ability.

[0038] Surface bonding strength testing Testing method: According to GB / T17657-2013 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Veneered Wood-based Panels", measure the adhesive force of the glue layer between the panel layer and the density board buffer layer through tensile or shear tests, with the unit of megapascal (MPa). Cut standard-sized specimens (such as 50 mm × 50 mm) from the door body, and use special fixtures for peeling or shear tests, and record the maximum load at the time of failure.

[0039] Test results:

[0040] Result analysis Influencing factors of sound insulation quantity Core material structure: The gradient-filled egg cotton (low density in the center + high density at the edges) can significantly improve the sound insulation performance compared to uniform filling or no filling (such as Comparative Example 2), especially in the low-frequency range (100 Hz). For example, the sound insulation of Example 1 (gradient filling) is 3 dB higher than that of Comparative Example 2 (no filling) with the same door frame thickness, and the low-frequency range is improved by 6 dB. Increasing the door frame thickness (such as the 50 mm thick door frame in Example 2) can further improve the sound insulation because the high-density structure of the laminated wood effectively blocks the sound wave conduction.

[0041] Adhesive layer process: The coating amount of the sound insulation sealant and the cold pressing pressure affect the medium and high-frequency sound insulation. For example, Example 2 uses a high coating amount (260 g / m²) and staged cold pressing, and the sound insulation in the medium and high-frequency range (1000 Hz) reaches 52 dB, which is 5 dB higher than that of Example 1 (145 g / m²). The staged cold pressing process (such as Examples 1 - 5) is more uniform than single-pressure cold pressing, avoiding air pockets in the adhesive layer or panel damage caused by overpressure.

[0042] Structural stability Flatness: The door frame thickness and the distance between the dragon bone frames affect the anti-deformation ability of the door body. For example, a thick door frame (50 mm in Example 2) and flatness (0.4 mm / 500 mm) are better than a thin door frame (25 mm in Example 1, flatness 0.5 mm / 500 mm); the smaller the distance between the dragon bone frames (such as 30 mm in Example 1), the denser the structural support, and the better the flatness.

[0043] Surface gluing strength: A high coating amount (such as 260 g / m² in Example 2) can improve the bonding force of the adhesive layer (0.84 MPa), but excessive pressure (such as 1.0 MPa in the first stage of Example 3) may cause the adhesive layer to be too thin and the strength to decrease (0.65 MPa).

[0044] Defect verification of comparative experiments Comparative Example 1 (ordinary glue + no edge-sealing cotton): The sound insulation is only 31 dB, significantly lower than that of the examples, proving the necessity of the viscoelasticity of the sound insulation sealant for sound wave blocking. Without installing wear-resistant sound insulation edge-sealing cotton, there are acoustic gaps at the upper and lower edges of the door body, and the sound leakage phenomenon is serious (contributing approximately 3 - 5 dB of sound insulation loss), proving the necessity of the edge-sealing cotton for the overall sound insulation performance.

[0045] Comparative Example 2 (no egg cotton): The sound insulation is 34 dB, lower than that of the examples with egg cotton filling. Although the door frame and dragon bone frame structures are the same, without egg cotton filling, the sound wave propagates freely in the cavity, and the sound insulation effect is significantly reduced, proving the key role of egg cotton filling in improving the overall sound insulation performance.

[0046] In summary, through the gradient filling of egg cotton, the staged cold pressing process, and the optimization of the sealant layer, the present invention achieves a balance between the broadband sound insulation performance and the structural stability of the wooden sound insulation door. The test data shows that the core technical features (such as egg cotton filling, sound insulation sealant, and edge-sealing cotton) have a significant synergistic effect on improving the sound insulation quantity, and the process parameters (door frame thickness, glue quantity, cold pressing pressure) can be flexibly adjusted according to actual needs, and are applicable to acoustic designs in multiple scenarios such as residential and commercial use.

[0047] However, the above are only specific embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the scope of protection of the present invention patent, should still fall within the scope covered by the claims of the present invention.

Claims

1. A preparation process for a double-cover shock-absorbing wooden sound-insulating door, characterized in that: The following steps are involved: (1) Core material preparation process: laminated timber is used to make a door frame (101), an I-shaped keel frame (103) is arranged in the door frame, and a central egg cotton sound insulation layer (102a) and an edge egg cotton sound insulation layer (102b) having a higher density than the central egg cotton sound insulation layer (102a) are filled in the keel frame interval (104) from the center of the door body to the edge; (2) Surface layer composite process: sequentially bonding the panel layer (201), the first sound insulation sealant layer (202), the density board buffer layer (203) and the second sound insulation sealant layer (204) through a staged variable pressure cold pressing process; (3) Surface treatment: painting the panel layer (201); (4) Edge sealing treatment: Wear-resistant sound-insulating edge sealing cotton (301) is installed on the upper and lower sides of the door body (300).

2. The preparation process of the double-cover shock-absorbing wooden sound-insulating door according to claim 1 is characterized in that: The thickness of the door frame (101) described in step (1) is 25-50 mm, the spacing of the I-shaped keel frame (103) is 30-50 mm, the thickness of the egg cotton sound insulation layer (102a / 102b) is 5-10 mm less than the keel frame, the density difference of the gradient filled egg cotton is 10-15 kg / m³, the density of the central egg cotton sound insulation layer (102a) is ≤30 kg / m³, and the density of the edge egg cotton sound insulation layer (102b) is ≥40 kg / m³.

3. The preparation process of the double-cover shock-absorbing wooden sound-insulating door according to claim 1 is characterized in that: In step (2), the coating amount of the first sound insulation sealant layer (202) and the second sound insulation sealant layer (204) is 145-260 g / m², the staged variable pressure cold pressing time is 10-60 minutes, and the cold pressing pressure is 0.7-1.2 MPa.

4. The process for preparing a double-cover shock-absorbing and sound-insulating wooden door according to claim 1, characterized in that: The density board buffer layer (203) in step (2) is made of medium density fiberboard, and the panel layer (201) is a paper veneer or wood veneer veneer decorative layer.

5. The process for preparing a double-cover shock-absorbing and sound-insulating wooden door according to claim 1, characterized in that: The egg cotton sound insulation layer (102) in step (1) is made of melamine foam material, and the I-shaped keel frame (103) is made of pine or fir.

6. The process for preparing a double-cover shock-absorbing and sound-insulating wooden door according to claim 1, characterized in that: The wear-resistant sound-insulating edge banding cotton (301) described in step (4) is made of EPDM rubber and is installed in an integrated manner with the door frame (101) in the same color.

7. The process for preparing a double-cover shock-absorbing and sound-insulating wooden door according to claim 1, characterized in that: The cold pressing process in step (2) is divided into two stages: the first stage is the composite of the density board buffer layer (203) and the second sound insulation sealant layer (204), and the cold pressing time is 30-60 minutes; the second stage is the composite of the panel layer (201) and the first sound insulation sealant layer (202), and the cold pressing time is 10-30 minutes.

8. The process for preparing a double-cover shock-absorbing and sound-insulating wooden door according to claim 1, characterized in that: The paint finishing in step (3) adopts the following process: (1) Surface pretreatment: Use 400-600 grit sandpaper to mechanically polish the panel layer (201), and then use compressed air to remove surface dust; (2) Primer coating: Use high-pressure airless spray equipment to spray two-component polyurethane primer, the volume ratio of the main agent to the curing agent is 4:1, and the spraying thickness is controlled at 60-80μm; (3) Leveling and drying: Leveling for 10-15 minutes at a temperature of 25±3°C and a relative humidity of 50±5%, and then drying with hot air circulation at 60-70°C for 30-40 minutes; (4) Topcoat: Use air-assisted spraying to spray water-based acrylic polyurethane topcoat, adjust the viscosity to 90-110 seconds, and control the spraying thickness to 40-50 μm; (5) Curing treatment: Pre-dry at 50-60℃ for 15-20 minutes, using UV curing with an energy density of 800-1000mJ / cm².

9. A double-cover shock-absorbing wooden sound-insulating door, characterized in that: The invention is made by the preparation process of any one of claims 1 to 8, comprising a core material (100) and surface layers respectively arranged on both sides of the core material (100); the core material (100) comprises a laminated timber door frame (101), an I-shaped keel frame (103) and an egg-wool sound insulation layer (102) filled in the keel frame interval (104); the surface layer comprises a panel layer (201), a first sound insulation sealant layer (202), a density board buffer layer (203) and a second sound insulation sealant layer (204).

10. The wooden soundproof door according to claim 9, characterized in that: Wear-resistant sound-insulating edge sealing cotton (301) made of EPDM rubber is provided on the upper and lower sides of the door body (300).

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