Preparation method of guitar material

Abstract

The invention relates to the technical field of composite materials, and discloses a guitar material preparation method which comprises pretreatment, acoustic treatment, steeping liquor preparation, steeping treatment and hot pressing treatment.The method comprises the steps that pretreatment including degreasing, cleaning and drying is conducted on a wood sheet, so that the surface of a base material is clean, and the water content is reduced; meanwhile, an acoustic enhancing solvent containing graphene powder is subsequently coated on the surface of the wood and synergistically acts on the wood base material, so that a uniform acoustic function interface is provided for the material, a conduction path of sound waves in the material is optimized, and the acoustic performance of the final guitar panel is improved; according to the guitar panel, the wood is subjected to impregnation treatment by adopting the impregnation liquid composed of the epoxy resin, the polyurethane resin, the acoustic functional additive and the waterproof additive according to the specific proportion, all the components are subjected to synergistic reaction and cross-linking during hot-pressing curing, and the durability and waterproofness of the guitar panel are enhanced.

Description

Technical Field

[0001] This invention relates to the field of composite materials technology, specifically a method for preparing guitar materials. Background Technology

[0002] The guitar is often regarded as a primary instrument in pop, rock, blues, folk, and flamenco music. In classical music, it is often performed as a solo or duet. Of course, it also plays a significant supporting role in chamber music and orchestral music.

[0003] Currently, in the production process of guitar soundboard materials, due to the limitations of traditional manufacturing processes, existing methods do not adequately treat the wood substrate, resulting in poor sound wave transmission efficiency. Furthermore, the wood is prone to deformation or performance degradation under varying temperature and humidity conditions, affecting the instrument's sound quality stability and lifespan.

[0004] Therefore, a method for preparing guitar materials is proposed to solve the above problems. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method for preparing guitar materials, which solves the problems of poor sound wave conduction efficiency, affecting the sound quality stability and service life of the instrument mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a method for preparing guitar material, comprising the following steps: Step 1: Pretreatment. Select wood sheets with a thickness of 0.5-1.0 mm, and degrease, clean, and dry them. Step 2: Acoustic treatment, applying acoustic enhancement solvent 1-3 times to the surface of the pretreated wood veneer using a spraying device; Step 3: Preparation of impregnation solution; the impregnation solution is prepared. The impregnation solution is made from the following raw materials in parts by weight: 50-60 parts epoxy resin, 20-30 parts polyurethane resin, 5-10 parts acoustic functional additives, and 5-10 parts waterproofing additives. Step 4: Impregnation treatment. The acoustically treated wood sheets are placed in an impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated wood sheets are stacked layer by layer and cured and shaped using a hot press to obtain the guitar soundboard material.

[0007] Preferably, the preprocessing includes the following steps: Soak the wood chips in a stainless steel container containing degreasing solution at room temperature for 1-2 hours. During the soaking process, stir with a stirrer at 50-100 rpm. After soaking, remove the wood chips, rinse them with running water for 10-20 minutes, and then air dry them at room temperature or place them in an oven at 40-60℃ for 1-2 hours until the moisture content of the wood chips is below 8%.

[0008] Preferably, the degreasing liquid is composed of ethanol and an organosilicon waterproofing agent, wherein the mass ratio of the organosilicon waterproofing agent to ethanol is 1:10, the concentration of ethanol is above 95%, the concentration of the organosilicon waterproofing agent is 10%-20%, the organosilicon waterproofing agent is one of methylsilane, ethylsilane or phenylsilane, and the amount of degreasing liquid used is 3-5 times the weight of the wood sheets.

[0009] Preferably, the acoustic enhancement solvent in step two is prepared by the following steps: Select graphene powder, deionized water and dispersant, add graphene powder, deionized water and dispersant to a high-speed stirring device, stir at 500-1000 r / min for 20-30 min until uniformly dispersed, and complete the preparation of acoustic enhancement solvent; The spraying equipment is a high-pressure sprayer with a spraying pressure of 0.3-0.6 MPa, a spraying speed of 15-25 cm / s, and a coating thickness of 10-30 micrometers.

[0010] Preferably, the mass ratio of graphene powder, deionized water and dispersant is 1:100:0.05, the dispersant is one of polyvinylpyrrolidone or sodium dodecyl sulfate, the particle size of graphene powder is 1-10 micrometers, and the specific surface area is 200-500 m² / g.

[0011] Preferably, the acoustic functional additive is prepared by the following method: Waste mica flakes are collected from industrial waste, sorted to remove impurities, and then placed in a drum washing machine to be washed with deionized water for 30-60 minutes. After that, they are placed in an oven to dry at 80-100℃ for 2-4 hours. After drying, they are taken out and crushed and ground in a ball mill, and then sieved through a 100-200 mesh screen to obtain mica granules. The mica particles have a diameter of 50-100 micrometers. The mica particles are laid flat in the plasma reaction chamber, and a vacuum pump is used to achieve a vacuum level of 1×10⁻⁶ in the reaction chamber. -1 ~1×10 -3 Pa, and high-purity nitrogen gas is continuously injected at a flow rate of 10-50 sccm. At the same time, a plasma generator is used with a power set to 300-700w and a treatment time of 7-15 minutes. After treatment, the activated acoustic functional additive is obtained.

[0012] Preferably, the impregnation solution is prepared by the following method: first, epoxy resin and polyurethane resin are added to a stirring device equipped with a temperature control device, the temperature is controlled at 25-35°C, and the mixture is stirred at a speed of 300-600 r / min for 15-20 minutes to ensure that the resin is fully mixed. Then add acoustic functional additives and waterproof additives, increase the stirring speed to 600-1200 r / min, and continue stirring for 25-35 minutes until the mixture is uniform and there are no visible particles. Maintain a constant temperature during stirring to avoid localized overheating.

[0013] Preferably, the impregnation treatment includes the following steps: completely immersing the acoustically treated wood sheets in an impregnation tank containing an impregnation solution and soaking for 2-4 hours; During the soaking process, start the stirrer every 15-25 minutes and stir at a speed of 40-70 r / min for 5-10 minutes to promote the penetration of the soaking solution. After impregnation, remove the wood sheets, drain off excess impregnation liquid, and pre-dry at 60-80℃ for 30-60 minutes.

[0014] Preferably, the waterproofing agent is at least one of silicone waterproofing agent, fluorocarbon resin or polyurethane waterproofing agent, wherein the silicone waterproofing agent is hydroxyl-terminated polydimethylsiloxane, the fluorocarbon resin is polytetrafluoroethylene dispersion, the polyurethane waterproofing agent is waterborne polyurethane resin, and the amount of waterproofing agent added is 5-10% of the total weight of the impregnation liquid.

[0015] Preferably, in step five, the temperature of the hot press during hot pressing is set to 160℃±5℃, the pressure is set to 12MPa±0.5MPa, the curing time is 1.5-2.5 hours, and a segmented pressurization method is adopted during the hot pressing process. The initial pressure is 5 MPa, maintained for 10 minutes, then increased to 12 MPa and maintained for the remaining time; After hot pressing, slowly cool down to below 50°C and remove to avoid internal stress.

[0016] Compared with the prior art, the present invention provides a method for preparing guitar materials, which has the following beneficial effects: 1. In this invention, the wood sheets are pretreated by degreasing, cleaning and drying to make the surface of the substrate clean and reduce the moisture content. At the same time, an acoustic enhancement solvent containing graphene powder is coated on the surface of the wood, which works synergistically on the wood substrate. This not only provides a uniform acoustic functional interface for the material, but also optimizes the transmission path of sound waves in the material, thereby improving the acoustic performance of the final guitar panel.

[0017] 2. In this invention, wood is impregnated with an impregnation solution composed of epoxy resin, polyurethane resin, acoustic functional additives, and waterproofing additives in a specific ratio. During hot-press curing, the components react synergistically and cross-link to form a dense and stable three-dimensional network structure. This structure not only endows the material with excellent dimensional stability and resistance to environmental changes, but the waterproofing additives it contains also build a continuous waterproof barrier inside the material, thereby simultaneously enhancing the durability and waterproofness of the guitar panel.

[0018] 3. In this invention, by using a segmented pressing method, including initial low pressure and subsequent high pressure, to cure and shape the impregnated wood sheets during the hot pressing process, the resin is fully penetrated and evenly distributed inside the wood. At the same time, the internal stress and defects in the laminated structure are reduced, thereby ensuring that the final guitar panel material has high bonding strength, excellent bending resistance and good overall structural integrity. Detailed Implementation

[0019] 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.

[0020] Example 1: A method for preparing a guitar material, comprising the following steps: Step 1: Pretreatment. Select wood sheets with a thickness of 0.5mm, and degrease, clean, and dry them. Step 2: Acoustic treatment, applying an acoustic enhancement solvent once to the surface of the pretreated wood veneer using a spraying device; Step 3: Preparation of impregnation solution; the impregnation solution is prepared. The impregnation solution is made from the following raw materials in parts by weight: 50 parts epoxy resin, 20 parts polyurethane resin, 5 parts acoustic functional additives, and 5 parts waterproofing additives. Step 4: Impregnation treatment. The acoustically treated wood sheets are placed in an impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated wood sheets are stacked layer by layer and cured and shaped using a hot press to obtain the guitar soundboard material.

[0021] Preprocessing includes the following steps: Soak the wood chips in a stainless steel container containing degreasing solution at room temperature for 1 hour. During the soaking process, stir with a stirrer at 50 rpm. After soaking, remove the wood chips, rinse them with running water for 10 minutes, and then air dry them at room temperature or put them in an oven at 40°C for 1 hour until the moisture content of the wood chips is below 8%.

[0022] The degreasing solution is composed of ethanol and organosilicon waterproofing agent. The mass ratio of organosilicon waterproofing agent to ethanol is 1:10. The concentration of ethanol is above 95%, and the concentration of organosilicon waterproofing agent is 10%. The organosilicon waterproofing agent is one of methylsilane, ethylsilane, or phenylsilane, and the amount of degreasing solution used is 3 times the weight of the wood chips.

[0023] The acoustic enhancement solvent in step two is prepared by the following steps: Graphene powder, deionized water and dispersant were selected and added to a high-speed stirring device. The mixture was stirred at 500 r / min for 20 min until it was uniformly dispersed, thus completing the preparation of the acoustic enhancement solvent. The spraying equipment is a high-pressure sprayer with a spraying pressure of 0.3 MPa, a spraying speed of 15 cm / s, and a coating thickness of 10 micrometers.

[0024] The mass ratio of graphene powder, deionized water, and dispersant is 1:100:0.05. The dispersant is either polyvinylpyrrolidone or sodium dodecyl sulfate. The graphene powder has a particle size of 1 micrometer and a specific surface area of ​​200 m² / g.

[0025] Acoustic functional additives are prepared by the following methods: Waste mica flakes were collected from industrial waste, sorted to remove impurities, and then placed in a drum washing machine to be washed with deionized water for 30 minutes. After that, they were placed in an oven to dry at 80°C for 2 hours. After drying, they were taken out and crushed and ground in a ball mill, and then sieved through a 100-mesh screen to obtain mica granules. The mica particles, with a diameter of 50 micrometers, were laid flat in the plasma reaction chamber, and a vacuum pump was used to achieve a vacuum level of 1×10⁻⁶ in the reaction chamber. -1 Pa, and high-purity nitrogen gas was continuously injected at a flow rate of 10 sccm. At the same time, a plasma generator was used with a power set to 300 W and a processing time of 7 minutes. After processing, the activated acoustic functional additive was obtained.

[0026] The impregnation solution is prepared by the following method: First, epoxy resin and polyurethane resin are added to a stirring device equipped with a temperature control device, the temperature is controlled at 25°C, and the mixture is stirred at a speed of 300 r / min for 15 minutes to ensure that the resins are fully mixed. Then add acoustic functional additives and waterproofing additives, increase the stirring speed to 600 r / min, and continue stirring for 25 minutes until the mixture is uniform and there are no visible particles. Maintain a constant temperature during stirring to avoid localized overheating.

[0027] The impregnation process includes the following steps: completely immersing the acoustically treated wood sheets in an impregnation tank containing impregnation liquid and soaking for 2 hours; During the soaking process, the stirrer is started every 15 minutes and stirred at 40 r / min for 5 minutes to promote the penetration of the soaking solution. After impregnation, remove the wood sheets, drain off excess impregnation liquid, and pre-dry at 60°C for 30 minutes.

[0028] The waterproofing agent is at least one of silicone waterproofing agent, fluorocarbon resin or polyurethane waterproofing agent, wherein the silicone waterproofing agent is hydroxyl-terminated polydimethylsiloxane, the fluorocarbon resin is polytetrafluoroethylene dispersion, and the polyurethane waterproofing agent is water-based polyurethane resin. The amount of waterproofing agent added is 5% of the total weight of the impregnation liquid.

[0029] In step five, the temperature of the hot press during hot pressing is set to 155℃, the pressure is set to 11.5MPa, and the curing time is 1.5 hours. A segmented pressurization method is used during the hot pressing process. The initial pressure is 5 MPa, maintained for 10 minutes, then increased to 12 MPa and maintained for the remaining time; After hot pressing, slowly cool down to below 50°C and remove to avoid internal stress.

[0030] Example 2: A method for preparing guitar material, comprising the following steps: Step 1: Pretreatment. Select wood sheets with a thickness of 0.75mm, and degrease, clean, and dry them. Step 2: Acoustic treatment, applying acoustic enhancement solvent twice to the surface of the pretreated wood veneer using a spraying device; Step 3: Preparation of impregnation solution; the impregnation solution is prepared. The impregnation solution is made from the following raw materials in parts by weight: 55 parts epoxy resin, 25 parts polyurethane resin, 8 parts acoustic functional additives, and 8 parts waterproofing additives. Step 4: Impregnation treatment. The acoustically treated wood sheets are placed in an impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated wood sheets are stacked layer by layer and cured and shaped using a hot press to obtain the guitar soundboard material.

[0031] Preprocessing includes the following steps: Soak the wood chips in a stainless steel container containing degreasing solution at room temperature for 1.5 hours. During the soaking process, stir with a stirrer at 75 rpm. After soaking, remove the wood chips, rinse them with running water for 15 minutes, and then air dry them at room temperature or place them in an oven at 50°C for 1.5 hours until the moisture content of the wood chips is below 8%.

[0032] The degreasing solution is composed of ethanol and organosilicon waterproofing agent. The mass ratio of organosilicon waterproofing agent to ethanol is 1:10. The concentration of ethanol is above 95%, and the concentration of organosilicon waterproofing agent is 15%. The organosilicon waterproofing agent is one of methylsilane, ethylsilane, or phenylsilane, and the amount of degreasing solution used is 4 times the weight of the wood chips.

[0033] The acoustic enhancement solvent in step two is prepared by the following steps: Graphene powder, deionized water and dispersant were selected and added to a high-speed stirring device. The mixture was stirred at 750 r / min for 25 min until it was uniformly dispersed, thus completing the preparation of the acoustic enhancement solvent. The spraying equipment is a high-pressure sprayer with a spraying pressure of 0.45 MPa, a spraying speed of 20 cm / s, and a coating thickness of 20 micrometers.

[0034] The mass ratio of graphene powder, deionized water, and dispersant is 1:100:0.05. The dispersant is either polyvinylpyrrolidone or sodium dodecyl sulfate. The graphene powder has a particle size of 5 micrometers and a specific surface area of ​​350 m² / g.

[0035] Acoustic functional additives are prepared by the following methods: Waste mica flakes were collected from industrial waste, sorted to remove impurities, and then placed in a drum washing machine to be washed with deionized water for 45 minutes. After that, they were placed in an oven to dry at 90°C for 3 hours. After drying, they were taken out and crushed and ground in a ball mill, and then sieved through a 150-mesh screen to obtain mica granules. The mica particles have a diameter of 75 micrometers. The mica particles are laid flat in the plasma reaction chamber, and a vacuum pump is used to achieve a vacuum level of 1×10⁻⁶ in the reaction chamber. -2 Pa, and high-purity nitrogen gas was continuously injected at a flow rate of 30 sccm. At the same time, a plasma generator was used with a power set to 500 W and a processing time of 11 minutes. After processing, the activated acoustic functional additive was obtained.

[0036] The impregnation solution is prepared by the following method: First, epoxy resin and polyurethane resin are added to a stirring device equipped with a temperature control device, the temperature is controlled at 30°C, and the mixture is stirred at a speed of 450 r / min for 18 minutes to ensure that the resins are fully mixed. Then add acoustic functional additives and waterproofing additives, increase the stirring speed to 900 r / min, and continue stirring for 30 minutes until the mixture is uniform and there are no visible particles. Maintain a constant temperature during stirring to avoid localized overheating.

[0037] The impregnation process includes the following steps: completely immersing the acoustically treated wood sheets in an impregnation tank containing impregnation liquid and soaking for 3 hours; During the soaking process, the stirrer is started every 20 minutes and stirred at 55 r / min for 8 minutes to promote the penetration of the soaking solution. After impregnation, remove the wood sheets, drain off excess impregnation liquid, and pre-dry at 70°C for 45 minutes.

[0038] The waterproofing agent is at least one of silicone waterproofing agent, fluorocarbon resin or polyurethane waterproofing agent, wherein the silicone waterproofing agent is hydroxyl-terminated polydimethylsiloxane, the fluorocarbon resin is polytetrafluoroethylene dispersion, and the polyurethane waterproofing agent is water-based polyurethane resin. The amount of waterproofing agent added is 7.5% of the total weight of the impregnation liquid.

[0039] In step five, the temperature of the hot press during hot pressing is set to 160℃, the pressure is set to 12MPa, and the curing time is 2.0 hours. A segmented pressurization method is used during the hot pressing process. The initial pressure is 5 MPa, maintained for 10 minutes, then increased to 12 MPa and maintained for the remaining time; After hot pressing, slowly cool down to below 50°C and remove to avoid internal stress.

[0040] Example 3: A method for preparing guitar material, comprising the following steps: Step 1: Pretreatment. Select wood sheets with a thickness of 1.0 mm, and degrease, clean, and dry them. Step 2: Acoustic treatment, applying acoustic enhancement solvent three times to the surface of the pretreated wood veneer using a spraying device; Step 3: Preparation of impregnation solution; the impregnation solution is prepared. The impregnation solution is made from the following raw materials in parts by weight: 60 parts epoxy resin, 30 parts polyurethane resin, 10 parts acoustic functional additives, and 10 parts waterproofing additives. Step 4: Impregnation treatment. The acoustically treated wood sheets are placed in an impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated wood sheets are stacked layer by layer and cured and shaped using a hot press to obtain the guitar soundboard material.

[0041] Preprocessing includes the following steps: Soak the wood chips in a stainless steel container containing degreasing solution at room temperature for 2 hours. During the soaking process, stir with a stirrer at 100 rpm. After soaking, remove the wood chips, rinse them with running water for 20 minutes, and then air dry them at room temperature or put them in an oven at 60°C for 2 hours until the moisture content of the wood chips is below 8%.

[0042] The degreasing solution is composed of ethanol and organosilicon waterproofing agent. The mass ratio of organosilicon waterproofing agent to ethanol is 1:10. The concentration of ethanol is above 95%, and the concentration of organosilicon waterproofing agent is 20%. The organosilicon waterproofing agent is one of methylsilane, ethylsilane, or phenylsilane, and the amount of degreasing solution used is 5 times the weight of the wood chips.

[0043] The acoustic enhancement solvent in step two is prepared by the following steps: Graphene powder, deionized water and dispersant were selected and added to a high-speed stirring device. The mixture was stirred at 1000 r / min for 30 min until it was uniformly dispersed, thus completing the preparation of the acoustic enhancement solvent. The spraying equipment is a high-pressure sprayer with a spraying pressure of 0.6 MPa, a spraying speed of 25 cm / s, and a coating thickness of 30 micrometers.

[0044] The mass ratio of graphene powder, deionized water, and dispersant is 1:100:0.05. The dispersant is either polyvinylpyrrolidone or sodium dodecyl sulfate. The graphene powder has a particle size of 10 micrometers and a specific surface area of ​​500 m² / g.

[0045] Acoustic functional additives are prepared by the following methods: Waste mica flakes were collected from industrial waste, sorted to remove impurities, and then placed in a drum washing machine to be washed with deionized water for 60 minutes. After that, they were placed in an oven to dry at 100°C for 4 hours. After drying, they were taken out and crushed and ground in a ball mill, and then sieved through a 200-mesh screen to obtain mica granules. The mica particles, with a diameter of 100 micrometers, were laid flat in the plasma reaction chamber, and a vacuum pump was used to achieve a vacuum level of 1×10⁻⁶ in the reaction chamber. -3 Pa, and high-purity nitrogen gas was continuously injected at a flow rate of 50 sccm. At the same time, a plasma generator was used with a power set to 700 W and a processing time of 15 minutes. After processing, the activated acoustic functional additive was obtained.

[0046] The impregnation solution is prepared by the following method: First, epoxy resin and polyurethane resin are added to a stirring device equipped with a temperature control device, the temperature is controlled at 35°C, and the mixture is stirred at a speed of 600 r / min for 20 minutes to ensure that the resins are fully mixed. Then add acoustic functional additives and waterproofing additives, increase the stirring speed to 1200r / min, and continue stirring for 35 minutes until the mixture is uniform and there are no visible particles. Maintain a constant temperature during stirring to avoid localized overheating.

[0047] The impregnation process includes the following steps: completely immersing the acoustically treated wood sheets in an impregnation tank containing impregnation liquid and soaking for 4 hours; During the soaking process, the stirrer is started every 25 minutes and stirred at 70 r / min for 10 minutes to promote the penetration of the soaking solution. After impregnation, remove the wood sheets, drain off excess impregnation liquid, and pre-dry at 80°C for 60 minutes.

[0048] The waterproofing agent is at least one of silicone waterproofing agent, fluorocarbon resin or polyurethane waterproofing agent, wherein the silicone waterproofing agent is hydroxyl-terminated polydimethylsiloxane, the fluorocarbon resin is polytetrafluoroethylene dispersion, and the polyurethane waterproofing agent is water-based polyurethane resin. The amount of waterproofing agent added is 10% of the total weight of the impregnation liquid.

[0049] In step five, the temperature of the hot press during hot pressing is set to 165℃, the pressure is set to 12.5MPa, and the curing time is 2.5 hours. A segmented pressurization method is used during the hot pressing process. The initial pressure is 5 MPa, maintained for 10 minutes, then increased to 12 MPa and maintained for the remaining time; After hot pressing, slowly cool down to below 50°C and remove to avoid internal stress.

[0050] Comparative Example 1: The difference between this comparative example and Example 1 is that no acoustic functional additives were added when preparing the impregnation solution in this comparative example.

[0051] Comparative Example 2 differs from Example 1 in that no waterproofing agent was added when preparing the impregnation solution in this comparative example.

[0052] Comparative Example 3 differs from Example 1 in that the wood sheets in this comparative example were not acoustically treated.

[0053] Comparative Example 4 differs from Example 1 in that no silicone waterproofing agent was added when preparing the degreasing solution in this comparative example.

[0054] The guitar panel materials prepared in Examples 1-3 and Comparative Examples 1-4 were subjected to performance tests. The test items and test methods are as follows: Acoustic transmission efficiency testing involves measuring the sound wave transmission loss of materials using an acoustic analyzer within a frequency range of 100-5000Hz, and then calculating the acoustic transmission efficiency. 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 then calculated. For flame retardancy testing, in a nitrogen-oxygen mixture with an initial oxygen concentration of 21%, the oxygen concentration is adjusted until the sample can burn continuously for 3 minutes or 50 mm in length, and the oxygen index is calculated. Strength testing was conducted using a universal testing machine.

[0055] The test data of the guitar panel materials prepared in Examples 1-3 and Comparative Examples 1-4 are recorded in the table below: Group Acoustic transmission efficiency (dB) Water absorption rate (%) Oxygen Index (OI) (%) Flexural strength (MPa) Example 1 92.5±0.5 2.1±0.2 31±1 128 Example 2 91.8±0.6 2.3±0.3 30±1 125 Example 3 93.2±0.4 1.9±0.2 32±1 131 Comparative Example 1 85.3±0.8 4.5±0.4 26±1 95 Comparative Example 2 88.7±0.7 6.8±0.5 24±1 98 Comparative Example 3 86.2±0.9 3.9±0.3 28±1 102 Comparative Example 4 89.5±0.6 5.2±0.4 25±1 105 By comparing and analyzing the data in the table, it can be seen that the guitar panel materials prepared using the processes in Examples 1-3 have significantly better performance than those prepared using the processes in Comparative Examples 1-4. This indicates that the present invention, through pretreatment of wood sheets including degreasing, cleaning, and drying, makes the substrate surface clean and reduces the moisture content. Simultaneously, the subsequent coating of the wood surface with an acoustically enhancing solvent containing graphene powder works synergistically with the wood substrate, providing not only a uniform acoustic functional interface but also optimizing the sound wave transmission path within the material, thereby improving the final acoustic performance of the guitar panel. Furthermore, the use of an impregnation solution composed of epoxy resin, polyurethane resin, acoustic functional additives, and waterproofing additives in a specific ratio on the wood... The wood is impregnated, and the components react synergistically and cross-link during hot pressing and curing to form a dense and stable three-dimensional network structure. This structure not only gives the material excellent dimensional stability and resistance to environmental changes, but the waterproofing additives it contains also build a continuous waterproof barrier inside the material, thereby simultaneously enhancing the durability and waterproofness of the guitar top. By using a segmented pressing method, including initial low pressure and subsequent high pressure, to cure and shape the impregnated wood sheets during the hot pressing stage, the resin is fully penetrated and evenly distributed inside the wood, while reducing internal stress and defects in the laminated structure. This ensures that the final guitar top material has high bonding strength, excellent bending resistance, and good overall structural integrity.

[0056] By comparing and analyzing the relevant data in the table, it can be seen that the guitar panel material prepared by the molding process of this invention has good acoustic properties, water resistance and flame retardancy.

[0057] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0058] 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 method for preparing a guitar material, characterized in that: Includes the following steps: Step 1: Pretreatment. Select wood sheets with a thickness of 0.5-1.0 mm, and degrease, clean, and dry them. Step 2: Acoustic treatment, applying acoustic enhancement solvent 1-3 times to the surface of the pretreated wood veneer using a spraying device; Step 3: Preparation of impregnation solution; the impregnation solution is prepared. The impregnation solution is made from the following raw materials in parts by weight: 50-60 parts epoxy resin, 20-30 parts polyurethane resin, 5-10 parts acoustic functional additives, and 5-10 parts waterproofing additives. Step 4: Impregnation treatment. The acoustically treated wood sheets are placed in an impregnation solution for impregnation treatment. Step 5: Hot pressing treatment. The impregnated wood sheets are stacked layer by layer and cured and shaped using a hot press to obtain the guitar soundboard material.

2. The method for preparing a guitar material according to claim 1, characterized in that: The preprocessing includes the following steps: Soak the wood chips in a stainless steel container containing degreasing solution at room temperature for 1-2 hours. During the soaking process, stir with a stirrer at 50-100 rpm. After soaking, remove the wood chips, rinse them with running water for 10-20 minutes, and then air dry them at room temperature or place them in an oven at 40-60℃ for 1-2 hours until the moisture content of the wood chips is below 8%.

3. The method for preparing a guitar material 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 1:10, the concentration of ethanol is above 95%, the concentration of the organosilicon waterproofing agent is 10%-20%, and the organosilicon waterproofing agent is one of methylsilane, ethylsilane or phenylsilane, and the amount of degreasing solution used is 3-5 times the weight of the wood sheets.

4. The method for preparing a guitar material according to claim 1, characterized in that: The acoustic enhancement solvent in step two is prepared by the following steps: Select graphene powder, deionized water and dispersant, add graphene powder, deionized water and dispersant to a high-speed stirring device, stir at 500-1000 r / min for 20-30 min until uniformly dispersed, and complete the preparation of acoustic enhancement solvent; The spraying equipment is a high-pressure sprayer with a spraying pressure of 0.3-0.6 MPa, a spraying speed of 15-25 cm / s, and a coating thickness of 10-30 micrometers.

5. The method for preparing a guitar material according to claim 4, characterized in that: The mass ratio of graphene powder, deionized water, and dispersant is 1:100:0.

05. The dispersant is either polyvinylpyrrolidone or sodium dodecyl sulfate. The graphene powder has a particle size of 1-10 micrometers and a specific surface area of ​​200-500 m² / g.

6. The method for preparing a guitar material according to claim 1, characterized in that: The acoustic functional additive is prepared by the following method: Waste mica flakes are collected from industrial waste, sorted to remove impurities, and then placed in a drum washing machine to be washed with deionized water for 30-60 minutes. After that, they are placed in an oven to dry at 80-100℃ for 2-4 hours. After drying, they are taken out and crushed and ground in a ball mill, and then sieved through a 100-200 mesh screen to obtain mica granules. The mica particles have a diameter of 50-100 micrometers. The mica particles are laid flat in the plasma reaction chamber, and a vacuum pump is used to achieve a vacuum level of 1×10⁻⁶ in the reaction chamber. -1 ~1×10 -3 Pa, and high-purity nitrogen gas is continuously injected at a flow rate of 10-50 sccm. At the same time, a plasma generator is used with a power set to 300-700w and a treatment time of 7-15 minutes. After treatment, the activated acoustic functional additive is obtained.

7. The method for preparing a guitar material according to claim 1, characterized in that: The impregnation solution is prepared by the following method: First, epoxy resin and polyurethane resin are added to a stirring device equipped with a temperature control device, the temperature is controlled at 25-35℃, and the mixture is stirred at a speed of 300-600r / min for 15-20 minutes to ensure that the resin is fully mixed. Then add acoustic functional additives and waterproof additives, increase the stirring speed to 600-1200 r / min, and continue stirring for 25-35 minutes until the mixture is uniform and there are no visible particles. Maintain a constant temperature during stirring to avoid localized overheating.

8. The method for preparing a guitar material according to claim 1, characterized in that: The impregnation process includes the following steps: completely immersing the acoustically treated wood sheets in an impregnation tank containing impregnation liquid and soaking for 2-4 hours; During the soaking process, start the stirrer every 15-25 minutes and stir at a speed of 40-70 r / min for 5-10 minutes to promote the penetration of the soaking solution. After impregnation, remove the wood sheets, drain off excess impregnation liquid, and pre-dry at 60-80℃ for 30-60 minutes.

9. The method for preparing a guitar material according to claim 1, characterized in that: The waterproofing agent is at least one of organosilicon waterproofing agent, fluorocarbon resin or polyurethane waterproofing agent, wherein the organosilicon waterproofing agent is hydroxyl-terminated polydimethylsiloxane, the fluorocarbon resin is polytetrafluoroethylene dispersion, and the polyurethane waterproofing agent is water-based polyurethane resin. The amount of waterproofing agent added is 5-10% of the total weight of the impregnation liquid.

10. A method for preparing a guitar material according to claim 1, characterized in that: In step five, the temperature of the hot press during hot pressing is set to 160℃±5℃, the pressure is set to 12MPa±0.5MPa, and the curing time is 1.5-2.5 hours. A segmented pressurization method is used during the hot pressing process. The initial pressure is 5 MPa, maintained for 10 minutes, then increased to 12 MPa and maintained for the remaining time; After hot pressing, slowly cool down to below 50°C and remove to avoid internal stress.