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CN-121973304-A - Stabilization treatment process for wood pipe body of woodwind instrument

CN121973304ACN 121973304 ACN121973304 ACN 121973304ACN-121973304-A

Abstract

The invention provides a stabilizing treatment process for a wood pipe body of a woodwind instrument, and relates to the technical fields of instrument manufacturing and wood modification. The process comprises the steps of precisely hydrolyzing hemicellulose by xylanase/mannase, grafting hydrophobic alkenyl to reduce hygroscopicity, carrying out vacuum pressurized impregnation by double resin liquid to form a flexible interface layer and a high-modulus functional body layer, and finally solidifying by gradient heating and the like to construct a gradient modulus composite structure. The invention realizes the cooperative optimization of the dimensional stability, the mechanical enhancement and the acoustic retention of the pipe body, has the characteristics of water and oil repellency, antibiosis and wear resistance, and solves the problem that the traditional process is difficult to consider the dimensional stability and the acoustic performance.

Inventors

  • LI SIDONG

Assignees

  • 霸州超拨乐器有限公司

Dates

Publication Date
20260505
Application Date
20260310

Claims (10)

  1. 1. The stabilizing treatment process of the wood pipe body of the woodwind instrument is characterized by comprising the following steps of: s1, sequentially performing hemicellulase treatment and C6-C18 alkenyl succinic anhydride treatment on a wooden pipe blank to obtain a first blank; S2, the first blank is immersed in a first resin liquid, and then pre-solidification is carried out to obtain a second blank; S3, immersing the second blank into a second resin solution to obtain a third blank; S4, curing the third blank to obtain a stabilized woodwind instrument woodtube body; the first resin liquid comprises epoxy resin with the epoxy equivalent of 180-220 and hydroxyl-terminated polyurethane prepolymer; the second resin liquid comprises epoxy resin, polyurethane prepolymer, nano cellulose whisker and hydroxyl-terminated polydimethylsiloxane.
  2. 2. The process according to claim 1, wherein the hemicellulase in step S1 comprises xylanase and/or mannanase.
  3. 3. The process according to claim 1, wherein the curing in step S4 comprises a gradient temperature-rising curing process, wherein the gradient temperature-rising curing process is performed by drying at 60-70 ℃ for 4-6 hours, then at 80-90 ℃ for 2-4 hours, and finally at 100-110 ℃ for 2-3 hours, and the temperature-rising rate is less than or equal to 5 ℃ per hour.
  4. 4. The process according to claim 3, wherein the step S4 further comprises naturally air-drying the third blank for 24 to 48 hours before the gradient heating curing process.
  5. 5. The process according to claim 1, wherein the sequentially performing hemicellulase treatment and C6 to C18 alkenyl succinic anhydride treatment on the wooden pipe blank in step S1 comprises: Placing the wood pipe blank into a reaction tank, adding a hemicellulase solution, soaking for 1-3 hours, wherein the concentration of the hemicellulase solution is 0.5% -2%, the pH value is 5.0-6.0, and the temperature is 40-50 ℃; Discharging a hemicellulase solution, cleaning with deionized water, injecting an organic solution containing alkenyl succinic anhydride of C6-C18, and reacting for 2-5 hours, wherein the mass fraction of the alkenyl succinic anhydride of C6-C18 is 5% -15%, and the reaction temperature is 50-70 ℃; And discharging residual liquid after the reaction is finished, washing the residual liquid with ethanol, and drying the residual liquid at 55-65 ℃ until the water content is 10-15%.
  6. 6. The process according to claim 5, wherein the organic solution containing alkenyl succinic anhydride of C6 to C18 further comprises a catalyst; The catalyst comprises at least one of 4-dimethylaminopyridine, triethylamine, anhydrous sodium carbonate or Dicyclohexylcarbodiimide (DCC).
  7. 7. The treatment process according to claim 1, wherein the impregnating the first resin solution in the step S2 comprises vacuumizing to-0.08 to-0.1 MPa for 30-40 minutes, injecting the first resin solution, vacuumizing for 2-4 hours, pressurizing to 0.3-0.5 MPa, and maintaining for 2-3 hours; The pre-curing condition is that the pre-curing is carried out for 1-2 hours at 60-80 ℃.
  8. 8. The process according to claim 1, wherein the impregnating the second resin solution in the step S3 comprises vacuumizing to-0.08 to-0.1 MPa for 30 minutes, injecting the second resin solution, vacuum-immersing for 3-5 hours, and pressurizing to 0.6-0.9 MPa for 8-12 hours.
  9. 9. The process according to claim 1, wherein the first resin liquid in step S2 further comprises methyltrimethoxysilane and absolute ethanol; The first resin liquid comprises, by weight, 40-60 parts of epoxy resin with an epoxy equivalent of 180-220, 20-30 parts of hydroxyl-terminated polyurethane prepolymer, 5-10 parts of methyltrimethoxysilane and 10-20 parts of absolute ethyl alcohol.
  10. 10. The process according to claim 1, wherein the second resin solution in step S3 further comprises methyltrimethoxysilane, absolute ethanol, distilled water, bamboo vinegar, polyethylene glycol, and a latent amine curing agent; The second resin liquid comprises, by weight, 40-50 parts of epoxy resin, 20-30 parts of polyurethane prepolymer, 1-3 parts of nanocellulose whisker, 2-4 parts of hydroxyl-terminated polydimethylsiloxane, 5-8 parts of methyltrimethoxysilane, 10-15 parts of absolute ethyl alcohol, 5-8 parts of distilled water, 3-5 parts of bamboo vinegar, 4-6 parts of polyethylene glycol and 3-8 parts of a latent amine curing agent.

Description

Stabilization treatment process for wood pipe body of woodwind instrument Technical Field The invention relates to the technical field of musical instrument manufacturing and wood modification, in particular to a stabilizing treatment process for a wood pipe body of a woodwind instrument. Background The pipe body of the woodwind instrument (such as clarinet, flute, etc.) is mostly made of hardwood such as ebony, rosewood, etc., and can give the instrument rich and full tone due to compact texture and excellent acoustic conductivity. However, natural wood is rich in hydroxyl groups, and is easy to shrink and expand along with the change of environmental temperature and humidity, so that the pipe body is deformed and cracked, and the sound stability and the service life are seriously affected. Therefore, stabilization of woods for woodwind instruments is a key technology in the field of instrument manufacturing. Existing wood stabilization techniques mainly include physical and chemical methods. Physical methods such as vacuum pressurizing impregnation are used for improving dimensional stability by filling resin into wood cell cavities, but the compatibility of the resin and cell wall interfaces is poor, stress concentration is easy to generate after curing, and uneven filling can cause the reduction of the vibration conduction performance of the wood, so that tone color is smoky and sensitivity is reduced. Chemical methods such as acetylation, etc. reduce hygroscopicity by reacting anhydride with hydroxyl groups, but acidic byproducts are easily generated in the reaction process, cellulose degradation is possibly caused, and the indiscriminate modification can damage the acoustic skeleton of wood, so that the acoustic performance is difficult to be considered. The prior art is mainly aimed at the mechanical enhancement requirement of building materials, does not fully consider the special requirement of musical instrument wood on acoustic performance, and lacks a treatment process capable of realizing dimensional stability and acoustic retention at the same time. Therefore, there is a need to develop a stabilization method specifically for woodwind instruments, which can efficiently suppress the hygroscopic deformation while maximally preserving and even optimizing the natural acoustic characteristics thereof. Disclosure of Invention In order to improve the dimensional stability and acoustic performance compatibility of a woodwind instrument woodpipe body, the invention provides a stabilization treatment process of the woodwind instrument woodpipe body, which is characterized in that the combined process of selective modification of hemicellulase and C6-C18 alkenyl succinic anhydride, gradient double-resin liquid vacuum pressurizing impregnation and gradient heating solidification is adopted, so that the hygroscopicity of wood is reduced radically, a natural acoustic skeleton is reserved, a gradient modulus composite structure is constructed, interface stress is eliminated, and the cooperative optimization of dimensional stability, durability and acoustic performance is realized. The invention aims to provide a stabilization treatment process for a woodwind instrument woodpipe body, which comprises the following steps of: s1, sequentially performing hemicellulase treatment and C6-C18 alkenyl succinic anhydride treatment on a wooden pipe blank to obtain a first blank; S2, the first blank is immersed in a first resin liquid, and then pre-solidification is carried out to obtain a second blank; S3, immersing the second blank into a second resin solution to obtain a third blank; S4, curing the third blank to obtain a stabilized woodwind instrument woodtube body; the first resin liquid comprises epoxy resin with the epoxy equivalent of 180-220 and hydroxyl-terminated polyurethane prepolymer; the second resin liquid comprises epoxy resin, polyurethane prepolymer, nano cellulose whisker and hydroxyl-terminated polydimethylsiloxane. Preferably, the hemicellulase in step S1 comprises a xylanase and/or a mannanase. Preferably, the curing treatment in the step S4 comprises gradient heating curing treatment, namely, drying for 4-6 hours at 60-70 ℃, then drying for 2-4 hours at 80-90 ℃, and finally drying for 2-3 hours at 100-110 ℃, wherein the heating rate is less than or equal to 5 ℃ per hour. Preferably, before the gradient heating curing treatment in the step S4, the method further includes naturally air-drying the third blank for 24-48 hours. Preferably, the step S1 of sequentially performing hemicellulase treatment and C6-C18 alkenyl succinic anhydride treatment on the wooden pipe blank comprises the following steps: Placing the wood pipe blank into a reaction tank, adding a hemicellulase solution, soaking for 1-3 hours, wherein the concentration of the hemicellulase solution is 0.5% -2%, the pH value is 5.0-6.0, and the temperature is 40-50 ℃; Discharging a hemicellulase solution, cleaning with deionized water, in