Preparation method of bamboo-based composite coiled material

Abstract

The application discloses a preparation method of a bamboo-based composite roll, which comprises the following steps: mixing bamboo particles with a nano-silicon dioxide solution, heat-pressing the mixture, and smearing an ammonium polyphosphate solution on the surface of the heat-pressed product to form the bamboo-based composite roll. The bamboo-based composite roll can produce a synergistic effect between the nano-silicon dioxide and the ammonium polyphosphate, can isolate oxygen and reduce heat transfer, can reduce the possibility of combustion, can improve the flame retardancy of the bamboo-based composite roll, and can solve the defects of insufficient flame retardancy of the bamboo-based composite roll in the prior art. The phosphate obtained by decomposing the ammonium polyphosphate can cause the surface of the heat-pressed product to carbonize, the nano-silicon dioxide particles can promote the formation of the carbonization reaction, the carbonization layer has a more stable and dense structure, the formation of the carbonization layer can protect the heat-pressed product, oxygen can be more effectively isolated, heat transfer can be slowed down, and the flame retardancy of the bamboo-based composite roll is improved.

Description

Technical Field

[0001] This invention relates to the field of roll material preparation technology, and more particularly to a method for preparing bamboo-based composite roll material. Background Technology

[0002] Bamboo-based composite rolls, also known as high-performance bamboo-based fiber composites or commonly referred to as "bamboo steel," are essentially bamboo fiber composite materials. They utilize the high strength, high modulus, and light weight of bamboo fibers, directly separating natural fibers from bamboo through mechanical and physical methods, and then processing them in combination with other materials (such as resins).

[0003] Existing technology CN 114856123 B discloses a bamboo-based roll material and its manufacturing method, using carbonized bamboo as the substrate, loading photocatalyst and wear-resistant powder, and can be attached to the surface of an object by hot pressing. However, when used in high-temperature environments, the bamboo-based roll material is prone to combustion, causing damage to the bamboo-based roll material.

[0004] Therefore, it is necessary to improve the existing bamboo-based roll material preparation methods to address their shortcomings. Summary of the Invention

[0005] This invention overcomes the shortcomings of the prior art and provides a method for preparing bamboo-based composite rolls, aiming to solve the defect of insufficient flame retardancy in existing bamboo-based composite rolls.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a method for preparing bamboo-based composite roll material, comprising the following steps:

[0007] S1: Bake the bamboo segments at a temperature of 400-500℃ for 5-10 minutes.

[0008] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles;

[0009] S3: The bamboo particles in S2 are subjected to acid treatment for 2-3 hours;

[0010] S4: Mix the bamboo particles that have undergone acid treatment in S3 with the nano-silica solution, and then dry the mixture;

[0011] S5: The dried mixture in S4 is hot-pressed. After hot pressing, ammonium polyphosphate solution is applied to the hot-pressed product to obtain bamboo-based composite roll material.

[0012] In a preferred embodiment of the present invention, the wall thickness of the bamboo segment in S1 is 0.6-0.8 mm.

[0013] In a preferred embodiment of the present invention, the diameter of the bamboo particles in S2 is 0.2-0.3 mm.

[0014] In a preferred embodiment of the present invention, the acid treatment in S3 is an acid leaching treatment, and the acid leaching solution can be one or more of glacial acetic acid solution and hydrochloric acid solution.

[0015] In a preferred embodiment of the present invention, when the acid leaching solution in S3 is a mixture of glacial acetic acid and hydrochloric acid, the weight ratio of glacial acetic acid to hydrochloric acid is 1:1, and the concentration of the acid leaching solution is 5%.

[0016] In a preferred embodiment of the present invention, the diameter of the nano-silica in S4 is 500-800 nm, and the concentration of the nano-silica solution is 2-4%.

[0017] In a preferred embodiment of the present invention, the mass ratio of bamboo particles to nano-silica in S4 is 3:1-4:1.

[0018] In a preferred embodiment of the present invention, the drying temperature in step S4 is 250-350°C and the drying time is 1-2 hours.

[0019] In a preferred embodiment of the present invention, the hot pressing temperature in step S5 is 150°C, the hot pressing pressure is 8 MPa, and the hot pressing time is 60 min.

[0020] In a preferred embodiment of the present invention, the concentration of the ammonium polyphosphate solution in S5 is 8-10%.

[0021] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0022] (1) This invention provides a method for preparing bamboo-based composite roll material. The method involves mixing bamboo particles with a nano-silica solution and then hot-pressing the mixture. A polyphosphate solution is then applied to the surface of the hot-pressed product to form a bamboo-based composite roll material. Compared with the prior art, this method enables a synergistic effect between nano-silica and polyphosphate, which can isolate oxygen and reduce heat transfer, thereby reducing the possibility of combustion and improving the flame retardancy of the bamboo-based composite roll material. This method solves the problem of insufficient flame retardancy in the prior art.

[0023] (2) In this invention, bamboo particles are mixed with nano-silica solution and then hot-pressed, so that the bamboo particles and nano-silica in the hot-pressed product are mixed evenly. The high specific surface area of ​​nano-silica can reduce the heat transfer efficiency. Compared with the prior art, it can increase the heat transfer time between hot-pressed products and avoid the bamboo particles from reaching the ignition point due to excessive heat transfer.

[0024] (3) In this invention, an ammonium polyphosphate solution is applied to the surface of the hot-pressed product to form an ammonium polyphosphate coating on the surface of the hot-pressed product, which slows down the oxygen transfer efficiency on the hot-pressed product. Compared with the prior art, it can reduce the oxygen transfer rate on the hot-pressed product and prevent the bamboo particles from contacting sufficient oxygen concentration to reach the combustion conditions, thus providing protection.

[0025] (4) In this invention, the phosphate obtained by the decomposition of ammonium polyphosphate can cause carbonization on the surface of the hot-pressed product, and the nano silica particles can promote the formation of the carbonization reaction, so that the carbonized layer has a more stable and dense structure. Compared with the prior art, it can improve the formation of the carbonized layer so that the hot-pressed product can be protected by the carbonized layer, and can more effectively isolate oxygen and slow down heat transfer, thereby increasing the flame retardancy of bamboo-based composite rolls. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a flowchart illustrating the method steps of a preferred embodiment of the present invention. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein. Therefore, the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0030] like Figure 1 As shown, a method for preparing a bamboo-based composite roll material includes the following steps:

[0031] S1: Bake the bamboo segments at a temperature of 400-500℃ for 5-10 minutes.

[0032] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles;

[0033] S3: Acid treatment is applied to the bamboo particles in S2 for 2-3 hours;

[0034] S4: Mix the bamboo particles that have undergone acid treatment in S3 with the nano silica solution, and then dry the mixture;

[0035] S5: The dried mixture in S4 is hot-pressed. After hot pressing, ammonium polyphosphate solution is applied to the hot-pressed product to obtain bamboo-based composite roll material.

[0036] By mixing bamboo particles with a nano-silica solution and then hot-pressing them, and then coating the surface of the hot-pressed product with an ammonium polyphosphate solution, a bamboo-based composite roll material is formed. This allows the nano-silica and ammonium polyphosphate to produce a synergistic effect, which can isolate oxygen and reduce heat transfer, thereby reducing the possibility of combustion and improving the flame retardancy of the bamboo-based composite roll material. This solves the problem of insufficient flame retardancy in existing bamboo-based composite roll materials.

[0037] The wall thickness of the bamboo segments in S1 is 0.6-0.8 mm.

[0038] The diameter of the bamboo particles in S2 is 0.2-0.3 mm.

[0039] The acid treatment method in S3 is acid leaching, and the acid leaching solution can be one or more of glacial acetic acid solution and hydrochloric acid solution.

[0040] When the acid leaching solution in S3 is a mixture of glacial acetic acid and hydrochloric acid, the weight ratio of glacial acetic acid to hydrochloric acid is 1:1, and the concentration of the acid leaching solution is 5%.

[0041] The diameter of the nano-silica in S4 is 500-800 nm, and the concentration of the nano-silica solution is 2-4%.

[0042] The mass ratio of bamboo particles to nano-silica in S4 is 3:1-4:1.

[0043] Bamboo particles are mixed with a nano-silica solution and then hot-pressed to ensure uniform mixing of the bamboo particles and nano-silica in the hot-pressed product. The high specific surface area of ​​nano-silica can reduce heat transfer efficiency, increase the heat transfer time between hot-pressed products, and prevent the bamboo particles from reaching their ignition point due to excessively rapid heat transfer.

[0044] The drying temperature in S4 is 250-350℃, and the drying time is 1-2 hours.

[0045] The hot-pressing temperature in S5 is 150℃, the hot-pressing pressure is 8MPa, and the hot-pressing time is 60min.

[0046] The concentration of the ammonium polyphosphate solution in S5 is 8-10%.

[0047] Applying ammonium polyphosphate solution to the surface of the hot-pressed product creates an ammonium polyphosphate coating, which slows down the oxygen transfer efficiency on the hot-pressed product. This reduces the oxygen transfer rate and prevents the bamboo particles from reaching a sufficient oxygen concentration to meet combustion conditions, thus providing protection.

[0048] The phosphates obtained from the decomposition of ammonium polyphosphate can cause carbonization on the surface of hot-pressed products. Nano-silica particles can promote the formation of carbonization reaction, making the carbonized layer have a more stable and dense structure. This can enhance the protection of the carbonized layer on the hot-pressed products, effectively isolate oxygen and slow down heat transfer, and increase the flame retardancy of bamboo-based composite rolls.

[0049] Example 1

[0050] A method for preparing bamboo-based composite roll material includes the following steps:

[0051] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0052] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0053] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0054] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 1%. Then dry the mixture at 300 °C for 1 hour.

[0055] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, an 8% ammonium polyphosphate solution is applied to the hot-pressed product 10 times, with a 5min interval between each application, to obtain bamboo-based composite roll material.

[0056] Example 2

[0057] A method for preparing bamboo-based composite roll material includes the following steps:

[0058] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0059] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0060] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0061] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 2%. Then dry the mixture at 300 °C for 1 hour.

[0062] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, an 8% ammonium polyphosphate solution is applied to the hot-pressed product 10 times, with a 5min interval between each application, to obtain bamboo-based composite roll material.

[0063] Example 3

[0064] A method for preparing bamboo-based composite roll material includes the following steps:

[0065] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0066] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0067] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0068] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 3%. Then dry the mixture at 300 °C for 1 hour.

[0069] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, an 8% ammonium polyphosphate solution is applied to the hot-pressed product 10 times, with a 5min interval between each application, to obtain bamboo-based composite roll material.

[0070] Example 4

[0071] A method for preparing bamboo-based composite roll material includes the following steps:

[0072] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0073] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0074] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0075] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 4%. Then dry the mixture at 300 °C for 1 hour.

[0076] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, an 8% ammonium polyphosphate solution is applied to the hot-pressed product 10 times, with a 5min interval between each application, to obtain bamboo-based composite roll material.

[0077] Example 5

[0078] A method for preparing bamboo-based composite roll material includes the following steps:

[0079] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0080] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0081] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0082] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 5%. Then dry the mixture at 300 °C for 1 hour.

[0083] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, an 8% ammonium polyphosphate solution is applied to the hot-pressed product 10 times, with a 5min interval between each application, to obtain bamboo-based composite roll material.

[0084] Example 6

[0085] A method for preparing bamboo-based composite roll material includes the following steps:

[0086] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0087] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0088] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0089] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 3%. Then dry the mixture at 300 °C for 1 hour.

[0090] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, a 7% ammonium polyphosphate solution is applied to the hot-pressed product 10 times, with a 5min interval between each application, to obtain bamboo-based composite roll material.

[0091] Example 7

[0092] A method for preparing bamboo-based composite roll material includes the following steps:

[0093] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0094] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0095] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0096] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 3%. Then dry the mixture at 300 °C for 1 hour.

[0097] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, a 9% ammonium polyphosphate solution is applied to the hot-pressed product 10 times with a 5min interval between each application to obtain bamboo-based composite roll material.

[0098] Example 8

[0099] A method for preparing bamboo-based composite roll material includes the following steps:

[0100] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0101] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0102] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0103] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 3%. Then dry the mixture at 300 °C for 1 hour.

[0104] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, a 10% ammonium polyphosphate solution is applied to the hot-pressed product 10 times, with a 5min interval between each application, to obtain bamboo-based composite roll material.

[0105] Example 9

[0106] A method for preparing bamboo-based composite roll material includes the following steps:

[0107] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0108] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0109] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0110] S4: Mix the bamboo particles that have undergone acid treatment in S3 with a nano silica solution. The diameter of the nano silica is 600 nm and the concentration of the nano silica solution is 3%. Then dry the mixture at 300 °C for 1 hour.

[0111] S5: The dried mixture in S4 is hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min. After hot pressing, an 11% ammonium polyphosphate solution is applied to the hot-pressed product 10 times, with a 5min interval between each application, to obtain bamboo-based composite roll material.

[0112] Comparative Example 1

[0113] A method for preparing bamboo-based roll material includes the following steps:

[0114] S1: Bamboo segments with a wall thickness of 0.6mm are baked at a temperature of 400℃ for 8 minutes.

[0115] S2: The bamboo segments baked in S1 are crushed to obtain bamboo particles with a diameter of 0.2 mm;

[0116] S3: The bamboo particles in S2 are subjected to acid leaching. The acid leaching solution is a 1:1 mixture of 5% glacial acetic acid and hydrochloric acid, and the treatment time is 2 hours.

[0117] S4: The bamboo particles that have undergone acid treatment in S3 are hot-pressed at a temperature of 150℃, a pressure of 8MPa, and a time of 60min to obtain bamboo-based roll material.

[0118] Samples were taken from Examples 1 to 9 and Comparative Example 1, and combustion experiments were conducted on the samples. The ignition time data are shown in Table 1.

[0119] Table 1 shows the ignition times in Examples 1 to 9 and Comparative Example 1.

[0120] sample Ignition time (s) Example 1 23.6 Example 2 29.5 Example 3 33.5 Example 4 31.2 Example 5 24.5 Example 6 30.4 Example 7 37.5 Example 8 34.7 Example 9 30.9 Comparative Example 1 21.3

[0121] As shown in Table 1, in Examples 1 to 5, as the concentration of the nano-silica solution gradually increases, the ignition time first increases and then decreases. This is because the increase in the concentration of nano-silica enables the formation of a protective layer, reducing the transfer of oxygen and heat. However, when the concentration is too high, agglomerates are easily formed between the silica particles, which changes the structure of the bamboo-based composite roll material, destroys the formation of the protective layer, and reduces the flame retardancy. Example 3 is the best example.

[0122] In Examples 3 and 6 to 9, as the concentration of the ammonium polyphosphate solution gradually increases, the ignition time first increases and then decreases. This is because the increase in the concentration of ammonium polyphosphate enables the formation of a protective layer, reducing the transfer of oxygen and heat. However, when the concentration is too high, too much ammonium polyphosphate melts and flows, causing dripping to form on the material surface, promoting the spread of heat and oxygen, and reducing the flame retardancy rate. The best embodiment is Example 7.

[0123] The ignition time in Examples 1 to 9 is higher than that in Comparative Example 1. The bamboo-based composite roll prepared using the method for preparing bamboo-based composite rolls has good flame retardant ability.

[0124] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for preparing a bamboo-based composite roll, characterized in that, The method comprises the following steps: S1: baking the bamboo section, the baking temperature is 400-500℃, and the baking time is 5-10min; S2: crushing the bamboo section baked in S1 to obtain bamboo particles; S3: acid treating the bamboo particles in S2 for 2-3h, the acid treating method is acid dipping treatment, the acid dipping solution can be one or more of glacial acetic acid solution and hydrochloric acid solution; S4: mixing the bamboo particles after acid treatment in S3 with nano-silica solution, the mass ratio of bamboo particles to nano-silica is 3:1-4:1, and drying the mixture; the diameter of nano-silica is 500-800nm, and the concentration of nano-silica solution is 2-4%; S5: hot pressing the dried mixture in S4, after hot pressing, polyphosphoric acid ammonium solution is applied on the hot pressing product, the concentration of polyphosphoric acid ammonium solution is 8-10%, and a bamboo-based composite roll is obtained.

2. The method of claim 1, wherein: The wall thickness of the bamboo section in S1 is 0.6-0.8mm.

3. The method for preparing a bamboo-based composite roll material according to claim 1, characterized in that: The diameter of the bamboo particles in S2 is 0.2-0.3mm.

4. The method for preparing a bamboo-based composite roll material according to claim 1, characterized in that: When the acid dipping solution in S3 is a mixture of glacial acetic acid and hydrochloric acid, the weight ratio of glacial acetic acid to hydrochloric acid is 1:1, and the concentration of the acid dipping solution is 5%.

5. The method for preparing a bamboo-based composite roll material according to claim 1, characterized in that: The drying temperature in S4 is 250-350℃, and the drying time is 1-2h.

6. The method of claim 1, wherein: The hot pressing temperature in S5 is 150℃, the hot pressing pressure is 8MPa, and the hot pressing time is 60min.

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