Modified menthol, preparation method thereof and bamboo brick plate manufacturing process using modified menthol
By modifying menthol and hot-pressing with bamboo strips, the problem of menthol is solved by volatilizing and insufficient strength after curing, and significantly improving the strength and moisture-proof and anti-corrosion performance of bamboo brick sheets, extending its service life and enhancing the anti-worm and moth effect.
Patent Information
- Application Number
- CN202510184520.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-19
- Publication Date
- 2025-06-03
AI Technical Summary
Existing menthol is prone to volatilization at room temperature, resulting in serious losses in building materials production, and limited strength after curing, making it difficult to maintain effective moisture-proof and anti-corrosion effects in humid or corrosive environments.
By modifying menthol, a composite modified menthol hydrogel is formed, and washed by centrifugation, deionized water, dried, shaping and sieving to obtain granular modified menthol. The modified menthol is mixed with bamboo strips and is heat-pressed to enhance its moisture-proof and anti-corrosion, insect-proof and moth-proof properties in bamboo brick sheets.
Modified menthol significantly improves the strength and moisture-proof and anti-corrosion properties of bamboo brick sheets, extends its service life, and maintains better anti-worm and moth effects in humid or corrosive environments.
Smart Images
Figure CN120078023A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of green building materials, and particularly relates to a modified menthol, a preparation method thereof, and a manufacturing process of bamboo brick plates using the same. Background Art
[0002] With the continuous promotion of the carbon reduction and carbon sequestration process and the continuous improvement of the public's environmental protection awareness, traditional building materials can no longer meet people's needs for environmentally friendly products. On this basis, green building materials have been widely developed and applied. Bamboo grows rapidly and is widely distributed. The made bamboo materials are light in weight, high in strength, large in toughness, and have the characteristics of energy conservation, environmental protection, and renewability. The coarse fiber structure of bamboo makes the surface hardness of bamboo high, and can effectively avoid problems such as cracking, deformation, and twisting. Since the bamboo fiber cells are arranged straight and have strong spatial ductility, through high-temperature steaming and spraying preservatives and other treatments during the production and manufacturing process, it can effectively prevent corrosion, and the color of bamboo is simple and elegant, having good application prospects in building materials. Therefore, bamboo bricks came into being.
[0003] Menthol has excellent moisture-proof, anti-corrosion, insect-proof, and moth-proof properties. The production process is simple, the output is huge, and the price is low. Menthol can ensure the humidity inside the building materials. When the environmental humidity is high, menthol can absorb some moisture to prevent the building materials from excessive moisture absorption; when the environmental humidity is low, the volatilization of menthol can provide a certain amount of moisture for the building materials to maintain the relative stability of its internal humidity, which helps to extend the service life of the building materials. At the same time, menthol has natural antibacterial and bacteriostatic properties, and can effectively inhibit the growth and reproduction of microorganisms such as molds and bacteria on the surface and inside of the building materials. In addition, menthol interacts with certain components in the building materials to improve its chemical stability and enhance the corrosion resistance of the building materials.
[0004] However, as a highly volatile substance, menthol can volatilize at room temperature. When applying menthol to the production and manufacturing of building materials, it is extremely easy to volatilize, causing losses and affecting the effect; after being applied to buildings, it cannot maintain an effective concentration for a long time and is difficult to continuously play the role of moisture-proof and anti-corrosion. At the same time, the strength of menthol after curing is limited. Especially in a humid or corrosive environment, the strengthening effect of menthol will gradually fail with volatilization. Therefore, it is necessary to modify menthol. Summary of the Invention
[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and propose a modified menthol, a preparation method thereof, and a manufacturing process of bamboo brick plates using the same.
[0006] To achieve the above purpose, the present invention adopts the following technical solutions:
[0007] The modified menthol of the present invention is in granular form and is obtained by centrifuging, washing with deionized water, drying, shaping and sieving a composite modified menthol hydrogel. The composite modified menthol hydrogel is composed of a menthol solution, a silicon source and a dilute acid in equal volumes. The menthol solution is composed of menthol and a solvent in a mass ratio of 1:3 to 5.
[0008] Preferably, the silicon source is methyl orthosilicate, ethyl orthosilicate or sodium silicate solution.
[0009] Preferably, the dilute acid is sulfuric acid, hydrochloric acid, nitric acid, acetic acid or citric acid solution.
[0010] Preferably, the solvent is propylene glycol, polyethylene glycol or alcohol.
[0011] The preparation method of the modified menthol of the present invention is as follows: According to the mass ratio of menthol to solvent of 1:3 to 5, dissolve menthol in the solvent and stir until completely dissolved to obtain a menthol solution. Then, add the silicon source to an equal volume of dilute acid at room temperature and stir. Let the reaction proceed until the pH value is between 6.9 and 7 and no silica hydrogel has formed, then add a menthol solution equal in volume to the silicon source and continue stirring until a composite modified menthol hydrogel precipitates. Use a centrifuge to centrifuge the composite modified menthol hydrogel to remove moisture and obtain a wet material of composite modified menthol. Then, repeatedly wash the wet material with deionized water until the concentration of acid radicals in the filtrate after washing is lower than the specified concentration. Vacuum-dry the washed wet material to obtain a dry material of composite modified menthol. Finally, shape the dry material (put it into a shaping machine) and sieve it to obtain composite modified menthol particles.
[0012] Preferably, the specified concentration is 0.1 mg / L.
[0013] Preferably, the vacuum drying is carried out at 50 to 60 °C and a vacuum degree of less than 2.67 kPa for 4 to 6 hours.
[0014] Preferably, a 100-200 mesh sieve is selected during sieving.
[0015] The manufacturing process of bamboo bricks and boards using the modified menthol of the present invention is as follows:
[0016] ① Material selection: Select the middle and lower bamboo sections of moso bamboo over 7 years old without insect damage and disease defects. Remove the branches and leaves on the surface of the moso bamboo, wash and dry it, then remove the surface bamboo green and the inner bamboo membrane, cut it longitudinally, and then cut it into bamboo strips, wash the bamboo strips and dry them in the air.
[0017] ② Antiseptic treatment: Place the bamboo strips treated in step ① (put into the cooking equipment) in a cooking liquid (such as water), add alkaline substances to the cooking liquid, and then cook. After the cooking is completed, take out the bamboo strips and dry them. Soak the dried bamboo strips in the antiseptic liquid. After the soaking is completed, wash the bamboo strips with water and dry them.
[0018] ③ Mix the composite modified menthol particles with the antiseptic treated bamboo strips.
[0019] ④Hot pressing: Soak the bamboo strips processed in step ③ in water for a preset time and then put them into a hot press to form a board.
[0020] ⑤ Cooling and humidity control: After hot pressing, take out the sheet, cool it to room temperature, and then place it in a temperature and humidity control box with the temperature set at 20-30°C and the humidity set at 50%-60% until the quality is constant.
[0021] ⑥ Fireproofing treatment: Clean and dry the surface of the board after treatment in step ⑤, then apply gypsum, and then dry to obtain a bamboo brick board.
[0022] Preferably, the preservative liquid is the supernatant obtained by reacting lime and water in a mass ratio of 1:1.
[0023] The present invention has the following beneficial effects:
[0024] The present invention adds a process of mixing modified menthol with bamboo strips and hot-pressing them together during the manufacturing process of the bamboo brick board. The modified menthol effectively solves the problem that menthol is easy to volatilize and the reinforcement effect needs to be improved through composite modification of menthol, so that the bamboo brick board manufactured by the present invention has higher strength and better moisture-proof, anti-corrosion, anti-insect and anti-moth effects. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 The present invention is a flow chart of the bamboo brick board manufacturing process. DETAILED DESCRIPTION
[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0027] The modified menthol of the invention is in granular form and is obtained by centrifuging, washing with deionized water, drying, shaping and sieving a composite modified menthol hydrogel. The composite modified menthol hydrogel consists of a menthol solution, a silicon source and a dilute acid with equal volumes; the menthol solution consists of menthol and a solvent in a mass ratio of 1:3-5; the solvent is propylene glycol, polyethylene glycol or alcohol; the silicon source is methyl orthosilicate, ethyl orthosilicate or sodium silicate solution; and the dilute acid is sulfuric acid, hydrochloric acid, nitric acid, acetic acid or citric acid solution.
[0028] The preparation method of modified menthol, the specific embodiment is as follows:
[0029] Example 1
[0030] In the first step, 10 g of menthol is added to 30 g of polyethylene glycol in a mass ratio of menthol to polyethylene glycol of 1:3, and the mixture is stirred sufficiently to completely dissolve the menthol in the polyethylene glycol to obtain a menthol solution for later use.
[0031] In the second step, 40 ml of a sodium silicate solution with a molar concentration of 0.175 M was added to 40 ml of dilute sulfuric acid with a molar concentration of 0.125 M at room temperature and stirred. When the pH value of the reaction solution was close to 7 but silica hydrogel had not yet formed, 40 ml of the menthol solution was added and stirred until the composite modified menthol hydrogel was precipitated.
[0032] The third step is to turn on the centrifuge and centrifuge the composite modified menthol hydrogel to remove excess water to obtain a composite modified menthol wet material. The wet material is repeatedly washed with deionized water until the sulfate ion concentration in the washed filtrate is lower than the detection limit of 0.1 mg / L. The washed wet material is vacuum dried for 5 hours at 55°C and a vacuum degree of less than 2.67 kPa (20 mmHg) to obtain a composite modified menthol dry material. The dry material is placed in a shaping machine for shaping and passed through a 150-mesh sieve to obtain composite modified menthol particles.
[0033] Example 2
[0034] In the first step, 10 g of menthol is added to 40 g of polyethylene glycol at a mass ratio of menthol to polyethylene glycol of 1:4, and the mixture is stirred sufficiently to completely dissolve the menthol in the polyethylene glycol to obtain a menthol solution for later use.
[0035] In the second step, 50 ml of a sodium silicate solution with a molar concentration of 0.175 M was added to 50 ml of dilute sulfuric acid with a molar concentration of 0.125 M at room temperature and stirred. When the pH value of the reaction solution was close to 7 but silica hydrogel had not yet formed, 50 ml of the menthol solution was added and stirred until the composite modified menthol hydrogel was precipitated.
[0036] The third step is to turn on the centrifuge and centrifuge the composite modified menthol hydrogel to remove excess water to obtain a composite modified menthol wet material. The wet material is repeatedly washed with deionized water until the sulfate ion concentration in the washed filtrate is lower than the detection limit of 0.1 mg / L. The washed wet material is vacuum dried for 5 hours at 55°C and a vacuum degree of less than 2.67 kPa (20 mmHg) to obtain a composite modified menthol dry material. The dry material is placed in a shaping machine for shaping and passed through a 150-mesh sieve to obtain composite modified menthol particles.
[0037] Example 3
[0038] First step, according to the mass ratio of menthol to polyethylene glycol of 1:5, add 10 g of menthol to 50 g of polyethylene glycol, and stir well to completely dissolve the menthol in the polyethylene glycol to obtain a menthol solution for standby.
[0039] Second step, at room temperature, add 60 ml of sodium silicate solution with a molar concentration of 0.175 M to 60 ml of dilute sulfuric acid with a molar concentration of 0.125 M and stir. When the reaction proceeds to the point where the pH value of the reaction solution approaches 7 but no silica hydrogel has formed, add 60 ml of the above-mentioned menthol solution and continue stirring until a composite modified menthol hydrogel precipitates.
[0040] Third step, start the centrifuge, centrifuge the composite modified menthol hydrogel to remove excess water and obtain a composite modified menthol wet material. Wash the wet material repeatedly with deionized water until the sulfate ion concentration in the washed filtrate is lower than the detection limit of 0.1 mg / L. Vacuum dry the washed wet material at 55 °C and a vacuum degree less than 2.67 kPa (20 mmHg) for 5 hours to obtain a composite modified menthol dry material. Put the dry material into a shaping machine for shaping and pass through a 150-mesh sieve to obtain composite modified menthol particles.
[0041] Example 4
[0042] First step, according to the mass ratio of menthol to propylene glycol of 1:3, add 10 g of menthol to 30 g of propylene glycol, and stir well to completely dissolve the menthol in the propylene glycol to obtain a menthol solution for standby.
[0043] Second step, at room temperature, add 40 ml of methyl orthosilicate solution with a molar concentration of 0.1 M to 40 ml of dilute hydrochloric acid with a molar concentration of 0.5 M and stir. When the reaction proceeds to the point where the pH value of the reaction solution approaches 7 but no silica hydrogel has formed, add 40 ml of the above-mentioned menthol solution and continue stirring until a composite modified menthol hydrogel precipitates.
[0044] Third step, start the centrifuge, centrifuge the hydrogel of the composite modified menthol at high speed to remove excess water and obtain a composite modified menthol wet material. Wash the wet material repeatedly with deionized water until the chloride ion concentration in the washed filtrate is lower than the detection limit of 0.1 mg / L. Vacuum dry at 55 °C and a vacuum degree less than 2.67 kPa (20 mmHg) for 5 hours to obtain a composite modified menthol dry material. Put the dry material into a shaping machine for shaping and pass through a 150-mesh sieve to obtain composite modified menthol particles.
[0045] Example 5
[0046] First step, according to the mass ratio of menthol to alcohol of 1:3, add 10 g of menthol to 30 g of alcohol, and stir well to completely dissolve the menthol in the alcohol to obtain a menthol solution for standby.
[0047] Step 2: At room temperature, add 40 ml of a methyl orthosilicate solution with a molar concentration of 0.1 M to 40 ml of a dilute hydrochloric acid solution with a molar concentration of 0.5 M and stir. When the reaction proceeds to a pH value of the reaction solution approaching 7 but no silica hydrogel has been formed, add 40 ml of the above-mentioned menthol solution and continue stirring until a composite modified menthol hydrogel precipitates.
[0048] Step 3: Start the centrifuge, centrifuge the hydrogel of the composite modified menthol at high speed to remove excess water and obtain the wet material of the composite modified menthol. Wash the wet material repeatedly with deionized water until the chloride ion concentration in the filtrate after washing is lower than the detection limit of 0.1 mg / L. Vacuum dry at 55 °C under a vacuum degree of less than 2.67 kPa (20 mmHg) for 5 hours to obtain the dry material of the composite modified menthol. Put the dry material into a shaping machine for shaping and pass through a 150-mesh sieve to obtain the composite modified menthol particles.
[0049] Example 6
[0050] Step 1: According to the mass ratio of menthol to alcohol of 1:3, add 10 g of menthol to 30 g of alcohol, stir well to completely dissolve the menthol in the alcohol, obtain a menthol solution, and set aside.
[0051] Step 2: At room temperature, add 40 ml of a sodium silicate solution with a molar concentration of 0.175 M to 40 ml of a dilute sulfuric acid solution with a molar concentration of 0.125 M and stir. When the reaction proceeds to a pH value of the reaction solution approaching 7 but no silica hydrogel has been formed, add 40 ml of the above-mentioned menthol solution and continue stirring until a composite modified menthol hydrogel precipitates.
[0052] Step 3: Start the centrifuge, centrifuge the composite modified menthol hydrogel to remove excess water and obtain the wet material of the composite modified menthol. Wash the wet material repeatedly with deionized water until the sulfate ion concentration in the filtrate after washing is lower than the detection limit of 0.1 mg / L. Vacuum dry at 50 °C under a vacuum degree of less than 2.67 kPa (20 mmHg) for 6 hours to obtain the dry material of the composite modified menthol. Put the dry material into a shaping machine for shaping and pass through a 150-mesh sieve to obtain the composite modified menthol particles.
[0053] Example 7
[0054] Step 1: According to the mass ratio of menthol to alcohol of 1:3, add 10 g of menthol to 30 g of alcohol, stir well to completely dissolve the menthol in the alcohol, obtain a menthol solution, and set aside.
[0055] Step 2: At room temperature, add 40 ml of sodium silicate solution with a molar concentration of 0.175 M to 40 ml of dilute sulfuric acid with a molar concentration of 0.125 M and stir. When the reaction proceeds to a pH value of the reaction solution close to 7 but no silica hydrogel has been formed, add 40 ml of the above-mentioned menthol solution and continue stirring until a composite modified menthol hydrogel precipitates.
[0056] Step 3: Start the centrifuge, centrifuge the composite modified menthol hydrogel to remove excess water and obtain a composite modified menthol wet material. Wash the wet material repeatedly with deionized water until the sulfate ion concentration in the washed filtrate is lower than the detection limit of 0.1 mg / L. Vacuum dry at 60 °C under a vacuum of less than 2.67 kPa (20 mmHg) for 4 hours to obtain a composite modified menthol dry material. Put the dry material into a shaping machine for shaping and pass through a 150-mesh sieve to obtain composite modified menthol particles.
[0057] Example 8
[0058] Step 1: According to the mass ratio of menthol to polyethylene glycol of 1:3, add 10 g of menthol to 30 g of polyethylene glycol, stir well to completely dissolve the menthol in the polyethylene glycol, obtain a menthol solution, and set aside.
[0059] Step 2: At room temperature, add 40 ml of sodium silicate solution with a molar concentration of 0.175 M to 40 ml of dilute sulfuric acid with a molar concentration of 0.125 M and stir. When the reaction proceeds to a pH value of the reaction solution close to 7 but no silica hydrogel has been formed, add 40 ml of the above-mentioned menthol solution and continue stirring until a composite modified menthol hydrogel precipitates.
[0060] Step 3: Start the centrifuge, centrifuge the composite modified menthol hydrogel to remove excess water and obtain a composite modified menthol wet material. Wash the wet material repeatedly with deionized water until the sulfate ion concentration in the washed filtrate is lower than the detection limit of 0.1 mg / L. Vacuum dry at 55 °C under a vacuum of less than 2.67 kPa (20 mmHg) for 5 hours to obtain a composite modified menthol dry material. Put the dry material into a shaping machine for shaping and pass through a 100-mesh sieve to obtain composite modified menthol particles.
[0061] Example 9
[0062] Step 1: According to the mass ratio of menthol to polyethylene glycol of 1:3, add 10 g of menthol to 30 g of polyethylene glycol, stir well to completely dissolve the menthol in the polyethylene glycol, obtain a menthol solution, and set aside.
[0063] Step 2: At room temperature, add 40 ml of sodium silicate solution with a molar concentration of 0.175 M to 40 ml of dilute sulfuric acid with a molar concentration of 0.125 M and stir. When the reaction proceeds to a point where the pH of the reaction solution approaches 7 but no silica hydrogel has formed, add 40 ml of the above-mentioned menthol solution and continue stirring until a composite modified menthol hydrogel precipitates.
[0064] Step 3: Start the centrifuge, centrifuge the composite modified menthol hydrogel to remove excess water and obtain a composite modified menthol wet material. Wash the wet material repeatedly with deionized water until the sulfate ion concentration in the washed filtrate is lower than the detection limit of 0.1 mg / L. Vacuum dry at 55 °C under a vacuum of less than 2.67 kPa (20 mmHg) for 5 hours to obtain a composite modified menthol dry material. Put the dry material into a shaping machine for shaping and pass through a 200-mesh sieve to obtain composite modified menthol particles.
[0065] Comparative Example
[0066] Put the menthol (unmodified) dry material into a shaping machine for shaping and pass through a 150-mesh sieve to obtain menthol particles.
[0067] As Figure 1 shown, the manufacturing process of bamboo bricks and boards using the composite modified menthol particles in the above-mentioned examples is as follows:
[0068] ① Material selection: Take the middle and lower bamboo sections of Moso bamboo that are over 7 years old without insect damage or disease defects. Remove the branches and leaves on the surface of the bamboo, clean and dry it, then remove the surface bamboo green and the inner bamboo membrane, cut it longitudinally, and then cut it into bamboo strips (the cross-section is a square with a side length of 50 - 320 mm), wash the bamboo strips and air dry them.
[0069] ② Antiseptic treatment: Place the bamboo strips processed in step ① (put into a steaming equipment) in a steaming liquid (such as clear water), add an alkaline substance (such as sodium hydroxide) to the steaming liquid to control the concentration of the alkaline substance in the formed solution at 10% - 15%, then carry out steaming, set the temperature at 200 °C, the steaming pressure at 0.55 - 0.60 MPa, and the steaming time at 3 hours. After the steaming is completed, take out the bamboo strips and air dry them. Put the air-dried bamboo strips into an antiseptic liquid for soaking (soak for 24 hours). The antiseptic liquid is selected as the supernatant after the reaction of lime and water with a mass ratio of 1:1. After the soaking is completed, wash the bamboo strips with water and air dry them.
[0070] ③ Mix the composite modified menthol particles with the antiseptic-treated bamboo strips to ensure that the composite modified menthol particles are evenly distributed on the surface or inside of the bamboo strips to enhance the moisture-proof and anti-corrosion performance of the bamboo strips.
[0071] ④Hot pressing: Soak the bamboo strips processed in step ③ in water for a preset time (more than 24 hours, usually soak for 4 - 12 weeks when higher mechanical property requirements), and then put them into a hot press for hot pressing to form a board. Among them, set the hot pressing speed to 0.9 min / mm, the hot pressing temperature to 135 °C, and the hot pressing pressure to 0.9 MPa.
[0072] ⑤Cooling and humidity adjustment: After the hot pressing is completed, take out the board, cool it to room temperature, and then place it in a temperature and humidity control box, set the temperature to 20 - 30 °C, and the humidity to 50% - 60%, until the quality is constant, usually taking 24 to 48 hours.
[0073] ⑥Fireproof treatment: Clean and dry the surface of the board processed in step ⑤, then apply gypsum (with a thickness of 12 mm), and then dry it to obtain a bamboo brick board.
[0074] Place various bamboo brick board samples prepared by using the composite modified menthol particles in the above nine examples and the menthol particles in the comparative example through the preparation method of the present invention in a laboratory environment with high humidity (relative humidity 90%) and 20 common wood-boring pests (such as longhorn beetles, powderpost beetles, drugstore beetles, termites) for 2 months. Take images of each sample and calculate the percentage of the mildew area in the total area of the sample (mildew rate) and the percentage of the insect damage area in the total area of the sample (insect damage rate), and measure the maximum depth of the decayed part and the maximum depth of the insect-damaged part of each sample, and measure the decline rates of the flexural strength and compressive strength of each sample (measured before and after the experiment for comparison and calculation), and list them in Table 1.
[0075] Table 1
[0076]
[0077] It can be analyzed from Table 1 that the reasons for the different performance differences are:
[0078] 1. Menthol concentration in the composite modified menthol: It can be analyzed from the comparative example, Example 1, Example 2, and Example 3 that the higher the menthol concentration, the stronger the moisture-proof, anti-corrosion, insect-proof, and moth-proof effects on the bamboo brick board, but the greater the impact on the internal structure of the bamboo brick board, resulting in a decrease in the strength improvement. It should be noted that in the comparative example, menthol is extremely volatile and difficult to continuously play a moisture-proof and anti-corrosion role, so the moisture-proof, anti-corrosion, insect-proof, and moth-proof effects on the bamboo brick board are not as good as those in Example 1, Example 2, and Example 3.
[0079] 2. Types of solvents: It can be analyzed from Example 1, Example 4 and Example 5 that polyethylene glycol has good moisture retention performance, has a strong moisture-proof and anti-corrosion effect on bamboo brick boards, has a general insect-proof and moth-proof effect, and greatly improves the strength of bamboo brick boards; propylene glycol has good solubility and stability, is suitable for the dissolution of menthol, has a moderate moisture-proof and anti-corrosion effect on bamboo brick boards, has a general insect-proof and moth-proof effect, and moderately improves the strength of bamboo brick boards; alcohol has good solubility and volatility, has a general moisture-proof and anti-corrosion effect on bamboo brick boards, has a moderate insect-proof and moth-proof effect, and moderately improves the strength of bamboo brick boards.
[0080] 3. Drying conditions: It can be analyzed from Example 1, Example 6 and Example 7 that lower drying temperature and longer drying time help to improve the moisture-proof, anti-corrosion, insect-proof and moth-proof performance and strength of bamboo brick boards.
[0081] 4. Screening particle size: It can be analyzed from Example 1, Example 8 and Example 9 that when the screening particle size is larger (smaller mesh number), it can improve the moisture-proof, anti-corrosion, insect-proof and moth-proof performance of bamboo brick boards, but will weaken the effect of improving its strength.
Claims
1. Modified menthol in granular form, characterized in that: The composite modified menthol hydrogel is obtained after centrifugation, deionized water washing, drying, shaping and sieving. The composite modified menthol hydrogel consists of menthol solution, silicon source and dilute acid with equal volumes; the menthol solution consists of menthol and solvent in a mass ratio of 1:3-5.
2. The modified menthol according to claim 1, characterized in that: The silicon source is methyl orthosilicate, ethyl orthosilicate or sodium silicate solution.
3. The modified menthol according to claim 1, characterized in that: The dilute acid is sulfuric acid, hydrochloric acid, nitric acid, acetic acid or citric acid solution.
4. The modified menthol according to claim 1, characterized in that: The solvent is propylene glycol, polyethylene glycol or alcohol.
5. A method for preparing modified menthol, characterized in that: According to the mass ratio of menthol to solvent of 1:3-5, menthol is dissolved in the solvent and stirred until it is completely dissolved to obtain a menthol solution; then, a silicon source is added to an equal volume of dilute acid at room temperature and stirred, and when the reaction is allowed to proceed until the pH value is between 6.9 and 7 and the silica hydrogel has not yet been formed, a menthol solution equal to the volume of the silicon source is added, and stirring is continued until a composite modified menthol hydrogel is precipitated; the composite modified menthol hydrogel is centrifuged using a centrifuge to remove water to obtain a composite modified menthol wet material; then, the wet material is repeatedly washed with deionized water until the acid radical ion concentration in the filtrate after washing is lower than the specified concentration; the washed wet material is vacuum dried to obtain a composite modified menthol dry material; finally, the dry material is shaped and sieved to obtain composite modified menthol particles.
6. The method for preparing modified menthol according to claim 5, characterized in that: The limiting concentration is 0.1 mg / L.
7. The method for preparing modified menthol according to claim 5, characterized in that: The vacuum drying is carried out for 4 to 6 hours at 50 to 60° C. and a vacuum degree less than 2.67 kPa.
8. The method for preparing modified menthol according to claim 5, characterized in that: The sieving is performed using a 100-200 mesh sieve.
9. A process for manufacturing bamboo brick board using the modified menthol according to any one of claims 1 to 4, characterized in that: The process is as follows: ① Material collection: Take the middle and lower bamboo sections of bamboos that are more than 7 years old and have no insect bites or disease defects, remove the branches and leaves on the surface of the bamboo, wash and dry it, remove the surface bamboo green and internal bamboo membrane, cut it longitudinally, and then cut it into bamboo strips, wash the bamboo strips, and dry them; ② Antiseptic treatment: place the bamboo strips treated in step ① in a cooking liquid, add an alkaline substance to the cooking liquid, and then cook; after the cooking is completed, take out the bamboo strips and dry them; soak the dried bamboo strips in the antiseptic liquid; after the soaking is completed, wash the bamboo strips with water and dry them; ③ Mixing the composite modified menthol particles with the antiseptic treated bamboo strips; ④Hot pressing forming: soak the bamboo strips treated in step ③ in water for a preset time and then put them into a hot press to form a board; ⑤ Cooling and humidity control: After hot pressing, take out the sheet, cool it to room temperature, and then place it in a temperature and humidity control box with the temperature set at 20-30°C and the humidity set at 50%-60% until the quality is constant; ⑥ Fireproofing treatment: Clean and dry the surface of the board after treatment in step ⑤, then apply gypsum, and then dry to obtain a bamboo brick board.
10. The manufacturing process of bamboo brick board according to claim 9, characterized in that: The antiseptic liquid is the supernatant obtained by reacting lime and water in a mass ratio of 1:1.