A method for flocculation enhancement of bamboo fibers

Abstract

The application discloses a method for flocculation of bamboo fiber, comprising the following steps: S1, cleaning and cutting original bamboo fiber to obtain bamboo fiber; S2, immersing the bamboo fiber into an acid solution, and stopping the acid treatment when the lignin in the bamboo fiber reaches a predetermined lignin removal rate, to obtain bamboo fiber with partially removed lignin in the secondary wall; S3, immersing the bamboo fiber into an alkali solution, and stopping the treatment when the polysaccharide content in the bamboo fiber reaches a predetermined polysaccharide removal rate, to obtain bamboo fiber with partially removed polysaccharide in the secondary wall; S4, sampling and placing into an ultrasonic cleaning machine, adding fillers and water, taking the optimal filling rate as the final filling rate, and recording the treatment time; S5, drying and opening the bamboo fiber, roller carding and cross-laying, and feeding into a needle punching machine for needle punching reinforcement, to obtain bamboo fiber flocculation. The application combines acid treatment, alkali treatment and fillers, reduces the difference in strength and flexibility of the secondary wall in different directions, and realizes uniformity and consistency of the fiber.

Description

Technical Field

[0001] This invention relates to the field of bamboo fiber technology, and in particular to a method for enhancing the fiber's fibrous structure. Background Technology

[0002] Bamboo fiber is a cellulose fiber extracted from naturally grown bamboo. Bamboo fiber has excellent breathability, instant water absorption, strong abrasion resistance, and good dyeability. It also has natural antibacterial, bacteriostatic, mite-repellent, deodorizing, and UV-resistant properties.

[0003] Bamboo fiber flocculation refers to the process of processing bamboo fiber into a flocculated material. Bamboo fiber is a cellulose fiber extracted from naturally grown bamboo. It has good air permeability, instant water absorption, strong abrasion resistance, and good dyeability. It also has natural antibacterial, bacteriostatic, mite-repellent, deodorizing, and UV-resistant functions.

[0004] The existing bamboo fiber fuzzing process includes the following steps: selecting fresh bamboo, removing the outer skin and nodes to leave the pure bamboo stalks, crushing and bleaching the bamboo to obtain pure bamboo pulp, spinning the bamboo pulp into fine bamboo fibers, and further processing the bamboo fibers, such as cutting and crushing, to form fuzzy materials. Because bamboo fiber is an environmentally friendly material, bamboo fiber fuzzing products also possess a certain degree of environmental friendliness.

[0005] However, because the secondary wall of bamboo fiber has a multi-layered structure, specifically a microstructure composed of a primary wall and a multi-layered secondary wall with alternating thin and thick layers, the secondary wall contains a lot of lignin and polysaccharides, resulting in a high degree of lignification. Excessive lignin content can make the fiber feel hard, affecting its flexibility and processing performance, while excessive polysaccharides can cause the fiber to break or wear easily during processing.

[0006] Furthermore, the secondary wall has as many as 8-9 layers, and the cell wall of each layer is relatively thick, resulting in high tensile strength of the fiber. At the same time, the multiple layers of the secondary wall lead to large differences in fiber properties and make processing more difficult. Summary of the Invention

[0007] This invention overcomes the shortcomings of the prior art and provides a method for enhancing the fiber flocculation of bamboo fibers.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a method for enhancing the fiber flocculation of bamboo fibers, comprising the following steps:

[0009] S1. Select high-quality raw bamboo fibers, clean and cut the bamboo fibers to obtain bamboo fibers with a specification of 5-10cm after removing impurities;

[0010] S2. The bamboo fiber obtained in S1 is immersed in an acid solution with a pH of 1.5-2.5 for treatment. The concentration of the acid solution is 0.5%-5%, and the acid treatment time is 75-80 minutes. During the treatment, samples are taken regularly to monitor the lignin content in the bamboo fiber. When the predetermined lignin removal rate is reached, the acid treatment is stopped, and bamboo fiber with lignin in the secondary wall partially removed is obtained.

[0011] S3. The bamboo fiber obtained in S2 is immersed in an alkaline solution with a pH of 11-13 for treatment. The concentration of the alkaline solution is 2%-5%, and the alkaline treatment time is 45-60 minutes. During the treatment, the polysaccharide content in the bamboo fiber is monitored. The treatment is stopped when the predetermined polysaccharide removal rate is reached, and bamboo fiber with partial removal of polysaccharides in the secondary wall is obtained.

[0012] S4. Place the bamboo fiber sample obtained in S3 into an ultrasonic cleaner, add filler and water, clean at 1200-1500W and detect the filling rate of the bamboo fiber in real time. At the same time, perform performance tests on the bamboo fiber, take the filling rate with the best performance as the final filling rate, record the processing time, and clean all the bamboo fiber.

[0013] S5. The bamboo fibers washed in S4 are dried, opened and moistened, and then carded and cross-laid with rollers. They are then fed into a needle punching machine for needle punching reinforcement to obtain bamboo fiber flakes.

[0014] In a preferred embodiment of the present invention, the specific steps for monitoring the lignin content in bamboo fiber in step S2 are as follows:

[0015] S21. Collect bamboo fiber before processing as the monitoring object, and use Klason method or ultraviolet spectroscopy to test the initial lignin content, and record it as S0;

[0016] S22. During the acid treatment process, take 2% of the sample every 20-25 minutes and test the lignin content using the method in S21. Record the result as S. n ;

[0017] S23. Calculate the lignin removal rate. With respect to the predetermined lignin removal rate range S 预 For comparison, acid treatment was stopped when the lignin removal rate was within the predetermined lignin removal rate range.

[0018] In a preferred embodiment of the present invention, in step S23, the predetermined lignin removal rate range S 预 The steps to determine it are as follows:

[0019] S231. Prepare several samples with different lignin removal rates of 10%, 30%, 50%, 70%, and 90% respectively.

[0020] S232. Compare the strength and toughness of samples with different lignin removal rates in different bamboo fibers. Measure the strength and toughness parameters of each sample using mechanical testing equipment.

[0021] S233. Select the degree to which the lignin removal rate optimizes the performance indicators of different bamboo fibers as the predetermined lignin removal rate range.

[0022] In a preferred embodiment of the present invention, the specific steps for stopping the acid treatment in S2 include: rinsing the bamboo fiber with sodium carbonate solution until pH=7, then removing it, rinsing it with deionized water for 10-15 minutes, and then drying it.

[0023] In a preferred embodiment of the present invention, in step S2, the acid solution used is a sulfuric acid solution or a hydrochloric acid solution, wherein the concentration of the sulfuric acid solution is 1%-5% and the concentration of the hydrochloric acid solution is 0.5%-3%.

[0024] In a preferred embodiment of the present invention, in step S3, the alkaline solution used is a sodium hydroxide solution or a potassium hydroxide solution.

[0025] In a preferred embodiment of the present invention, the specific steps for monitoring the polysaccharide content in bamboo fiber in step S3 are as follows:

[0026] S31. Collect bamboo fiber before processing as the monitoring object, and test the initial polysaccharide content using the phenol-sulfuric acid method or high performance liquid chromatography, and record it as T0;

[0027] S32. During the alkali treatment process, take 2% of the sample every 30-35 minutes and test the polysaccharide content using the method in S31. Record the result as T. n ;

[0028] S33. Calculate the polysaccharide removal rate. With respect to the predetermined polysaccharide removal rate range T 预 By comparison, the alkali treatment was stopped when the polysaccharide removal rate was within the predetermined polysaccharide removal rate range.

[0029] In a preferred embodiment of the present invention, in S33, the predetermined polysaccharide removal rate range T 预 The steps to determine it are as follows:

[0030] Predicted lignin removal rate range S 预 The steps to determine it are as follows:

[0031] S331. Prepare several samples with different polysaccharide removal rates of 10%, 30%, 50%, 70%, and 90% respectively;

[0032] S332. Compare the strength and toughness of samples with different polysaccharide removal rates in different bamboo fibers. Measure the strength and toughness parameters of each sample using mechanical testing equipment.

[0033] S333. Select the polysaccharide removal rate that optimizes the performance indicators of different bamboo fibers as the predetermined polysaccharide removal rate range.

[0034] In a preferred embodiment of the present invention, in step S4, the filler is one of calcium carbonate, silicon dioxide or talc.

[0035] In a preferred embodiment of the present invention, the specific steps for stopping the alkali treatment in step S3 include: rinsing the bamboo fiber with a dilute acetic acid solution until pH=7, then removing it, rinsing it with deionized water for 10-15 minutes, and then drying it.

[0036] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0037] (1) This invention provides a method for enhancing the fiber flocculation of bamboo fibers. By thoroughly cleaning and standardizing the cutting of bamboo fibers, the purity and consistency of the raw materials are ensured. The lignin and polysaccharide content in the bamboo fibers is precisely controlled through acid and alkali treatments, which not only improves the flexibility and processing performance of the fibers but also enhances their comfort during use. Finally, by controlling the entry of fillers, the differences in strength and flexibility of the secondary wall in different directions are reduced, thereby achieving uniformity and consistency of the fibers.

[0038] (2) In this invention, the lignin and polysaccharides in the secondary wall of bamboo fiber are partially removed by acid treatment and alkali treatment. Specifically, the acid treatment can remove some lignin, reduce the hardness and brittleness of bamboo fiber, and increase its flexibility and processability. The alkali treatment can remove the polysaccharides in bamboo fiber, further improve its performance, make the surface of bamboo fiber rougher, increase the friction and entanglement between bamboo fibers, thereby improving the strength and toughness of bamboo fiber flakes.

[0039] (3) This invention uses the Klason method and ultraviolet spectroscopy to quantitatively monitor the lignin content in bamboo fiber, which allows for real-time monitoring of the lignin removal rate. The acid treatment process can be controlled according to the predetermined optimal lignin removal rate range to ensure the bamboo fiber achieves optimal performance. This guarantees the quality and performance of bamboo fiber flakes.

[0040] (4) This invention uses samples with different degrees of lignin and polysaccharide removal, and compares the strength and toughness under different removal rates through mechanical testing. The removal rate that makes the bamboo fiber performance optimal is selected as the standard, which can scientifically and accurately determine the termination standard of the treatment.

[0041] (5) This invention uses sodium carbonate solution or dilute acetic acid solution to rinse the bamboo fiber after acid and alkali treatment to restore it to a neutral pH value. Then, it uses deionized water to wash the bamboo fiber to effectively remove residual acid and alkali and prevent acid and alkali from having a further impact on the bamboo fiber. At the same time, during the ultrasonic cleaning process, adding different fillers can change the gap between the bamboo fibers. Real-time monitoring of the filling rate can find the optimal filling situation, which can maximize the utilization rate of bamboo fiber and the strength of the flocs. Attached Figure Description

[0042] 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.

[0043] Figure 1 This is a flowchart of a preferred embodiment of the present invention. Detailed Implementation

[0044] 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.

[0045] 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.

[0046] like Figure 1 As shown, the present invention provides a method for enhancing bamboo fiber flocculation, comprising the following steps:

[0047] S1. Select high-quality raw bamboo fibers, clean and cut the bamboo fibers to obtain bamboo fibers with a specification of 5-10cm after removing impurities.

[0048] S2. The bamboo fiber obtained in S1 is immersed in an acid solution with a pH of 1.5-2.5 for treatment. The concentration of the acid solution is 0.5%-5%, and the acid treatment time is 75-80 minutes. During the treatment, samples are taken regularly to monitor the lignin content in the bamboo fiber. The acid treatment is stopped when the predetermined lignin removal rate is reached, and bamboo fiber with lignin in the secondary wall is obtained.

[0049] In S2, the acid solution used is either sulfuric acid solution or hydrochloric acid solution, wherein the concentration of sulfuric acid solution is 1%-5% and the concentration of hydrochloric acid solution is 0.5%-3%.

[0050] In S2, the specific steps for monitoring the lignin content in bamboo fiber are as follows:

[0051] S21. Collect bamboo fiber before processing as the monitoring object, and use Klason method or ultraviolet spectroscopy to test the initial lignin content, and record it as S0;

[0052] S22. During the acid treatment process, take 2% of the sample every 20-25 minutes and test the lignin content using the method in S21. Record the result as S. n ;

[0053] S23. Calculate the lignin removal rate. With respect to the predetermined lignin removal rate range S 预 For comparison, acid treatment was stopped when the lignin removal rate was within the predetermined lignin removal rate range.

[0054] In S23, the predetermined lignin removal rate range S 预 The steps to determine it are as follows:

[0055] S231. Prepare several samples with different lignin removal rates of 10%, 30%, 50%, 70%, and 90% respectively.

[0056] S232. Compare the strength and toughness of samples with different lignin removal rates in different bamboo fibers. Measure the strength and toughness parameters of each sample using mechanical testing equipment.

[0057] S233. Select the degree to which the lignin removal rate optimizes the performance indicators of different bamboo fibers as the predetermined lignin removal rate range.

[0058] In S2, the specific steps to stop the acid treatment include: rinsing the bamboo fiber with sodium carbonate solution until pH=7, then removing it, rinsing it with deionized water for 10-15 minutes, and then drying it.

[0059] S3. The bamboo fiber obtained in S2 is immersed in an alkaline solution with a pH of 11-13 for treatment. The concentration of the alkaline solution is 2%-5%, and the alkaline treatment time is 45-60 minutes. During the treatment, the polysaccharide content in the bamboo fiber is monitored. The treatment is stopped when the predetermined polysaccharide removal rate is reached, and bamboo fiber with partial removal of polysaccharides from the secondary wall is obtained.

[0060] In S3, the alkaline solution used is either sodium hydroxide solution or potassium hydroxide solution.

[0061] In S3, the specific steps for monitoring the polysaccharide content in bamboo fiber are as follows:

[0062] S31. Collect bamboo fiber before processing as the monitoring object, and test the initial polysaccharide content using the phenol-sulfuric acid method or high performance liquid chromatography, and record it as T0;

[0063] S32. During the alkali treatment process, take 2% of the sample every 30-35 minutes and test the polysaccharide content using the method in S31. Record the result as T. n ;

[0064] S33. Calculate the polysaccharide removal rate. With respect to the predetermined polysaccharide removal rate range T 预 By comparison, the alkali treatment was stopped when the polysaccharide removal rate was within the predetermined polysaccharide removal rate range.

[0065] In S33, the predetermined polysaccharide removal rate range T 预 The steps to determine it are as follows:

[0066] Predicted lignin removal rate range S 预 The steps to determine it are as follows:

[0067] S331. Prepare several samples with different polysaccharide removal rates of 10%, 30%, 50%, 70%, and 90% respectively;

[0068] S332. Compare the strength and toughness of samples with different polysaccharide removal rates in different bamboo fibers. Measure the strength and toughness parameters of each sample using mechanical testing equipment.

[0069] S333. Select the polysaccharide removal rate that optimizes the performance indicators of different bamboo fibers as the predetermined polysaccharide removal rate range.

[0070] In S3, the specific steps to stop the alkali treatment include: rinsing the bamboo fiber with a dilute acetic acid solution until pH=7, then removing it, rinsing it with deionized water for 10-15 minutes, and then drying it.

[0071] S4. Place the bamboo fiber sample obtained in S3 into an ultrasonic cleaner, add filler and water, clean at 1200-1500W and monitor the filling rate of the bamboo fiber in real time. At the same time, perform performance tests on the bamboo fiber, take the filling rate with the best performance as the final filling rate, record the processing time, and clean all the bamboo fiber.

[0072] In S4, the filler is one of calcium carbonate, silica, or talc.

[0073] In S4, the specific method for detecting the filling rate of bamboo fiber is one of photoelectric method, gravimetric method or volume displacement method.

[0074] S5. The bamboo fibers washed in S4 are dried, opened and moistened, and then carded and cross-laid with rollers. They are then fed into a needle punching machine for needle punching reinforcement to obtain bamboo fiber flakes.

[0075] Example 1

[0076] This embodiment provides a predetermined lignin removal rate range S. 预 The method, specifically the steps, are as follows:

[0077] (1) Prepare several samples with different lignin removal rates of 10%, 30%, 50%, 70%, and 90% respectively;

[0078] (2) The tensile strength, flexural strength and impact toughness of each sample were measured in accordance with ASTM D-638, ASTM D-790 and ASTM D-256.

[0079] S233. Select the degree to which the lignin removal rate optimizes the performance indicators of different bamboo fibers as the predetermined lignin removal rate range. Specific data are shown in Table 1.

[0080] Table 1 Performance data of samples with different lignin removal rates

[0081]

[0082] As shown in Table 1, the performance of bamboo fiber is optimal when the lignin removal rate is between 50% and 70%.

[0083] Example 2

[0084] This embodiment provides a predetermined polysaccharide removal rate range T. 预 The method, specifically the steps, are as follows:

[0085] (1) Prepare several samples with different polysaccharide removal rates of 10%, 30%, 50%, 70%, and 90% respectively;

[0086] (2) The tensile strength, flexural strength and impact toughness of each sample were measured in accordance with ASTM D-638, ASTM D-790 and ASTM D-256.

[0087] (3) The range of polysaccharide removal rates that optimizes the performance of different bamboo fibers is selected as the predetermined range of polysaccharide removal rates. Specific data are shown in Table 2.

[0088] Table 2 Performance data of samples with different polysaccharide removal rates

[0089]

[0090] As shown in Table 2, the performance of bamboo fiber is optimal when the polysaccharide removal rate is between 70% and 90%.

[0091] Example 3

[0092] This embodiment provides a method for determining the lignin removal rate and polysaccharide removal rate of bamboo fiber, including the following steps:

[0093] S1. Select high-quality raw bamboo fibers, clean and cut the bamboo fibers to obtain bamboo fibers with a specification of 5cm after removing impurities. Use the Klason method to test the initial lignin content and record it as S0. Use the phenol-sulfuric acid method to test the initial polysaccharide content and record it as T0.

[0094] S2. The bamboo fibers obtained in S1 were immersed in a 1% sulfuric acid solution with a pH of 1.5 for 75 minutes. During the treatment, 2% of the samples were taken at 20-minute intervals to test the lignin content of the acid-treated samples, and the results were recorded as S. n The lignin removal rate S was calculated. The bamboo fiber was rinsed with sodium carbonate solution until pH=7, then taken out, rinsed with deionized water for 10 minutes and dried.

[0095] S3. The bamboo fiber obtained in S2 was immersed in a 2% sodium hydroxide solution with a pH of 11 for 45 minutes. During the treatment, 2% of the sample was taken out every 30 minutes to test the content of the alkali-treated polysaccharides, and the result was recorded as T. n The polysaccharide removal rate T was calculated. The bamboo fiber was rinsed with dilute acetic acid solution until pH=7, then removed, rinsed with deionized water for 10 minutes, and dried.

[0096] The specific data in this embodiment are shown in Table 3.

[0097] Table 3. Lignin removal rate data (S) and polysaccharide removal rate data (T) at different test times.

[0098]

[0099] As shown in Table 3, the lignin removal rate was within the predetermined lignin removal rate range when treated with acid for 60 min, and the polysaccharide removal rate was within the predetermined polysaccharide removal rate range when treated with alkali for 60 min.

[0100] Example 4

[0101] This embodiment provides a method for determining the lignin removal rate and polysaccharide removal rate of bamboo fiber, including the following steps:

[0102] S1. Select high-quality raw bamboo fibers, clean and cut the bamboo fibers to obtain bamboo fibers with a specification of 10cm after removing impurities. Use the Klason method to test the initial lignin content and record it as S0. Use the phenol-sulfuric acid method to test the initial polysaccharide content and record it as T0.

[0103] S2. The bamboo fibers obtained in S1 were immersed in a 1% sulfuric acid solution with a pH of 2.5 for 80 minutes. During the treatment, 2% of the samples were taken at 25-minute intervals to test the lignin content of the acid-treated samples, and the results were recorded as S. n The lignin removal rate S was calculated. The bamboo fiber was rinsed with sodium carbonate solution until pH=7, then removed, rinsed with deionized water for 15 minutes and dried.

[0104] S3. The bamboo fiber obtained in S2 was immersed in a 2% sodium hydroxide solution with a pH of 13 for 60 minutes. During the treatment, 2% of the sample was taken out every 35 minutes to test the content of the alkali-treated polysaccharides, and the result was recorded as T. n The polysaccharide removal rate T was calculated. The bamboo fiber was rinsed with dilute acetic acid solution until pH=7, then removed, rinsed with deionized water for 15 minutes, and dried.

[0105] The specific data in this embodiment is shown in Table 4.

[0106] Table 4. Lignin removal rate data (S) and polysaccharide removal rate data (T) at different test times.

[0107]

[0108]

[0109] As shown in Table 4, the lignin removal rate was within the predetermined lignin removal rate range when treated with acid for 40 min, and the polysaccharide removal rate was within the predetermined polysaccharide removal rate range when treated with alkali for 60 min.

[0110] Example 5

[0111] This embodiment provides a method for determining the optimal filling ratio of bamboo fiber, including the following steps:

[0112] Bamboo fibers obtained from acid treatment for 60 min and alkali treatment for 60 min in Example 3, and bamboo fibers obtained from acid treatment for 40 min and alkali treatment for 60 min in Example 4, were respectively sampled and placed in an ultrasonic cleaner. Silica and water were added, and the cleaning was carried out at 1200W. The filling rate of the bamboo fibers was detected in real time by weighing method. At the same time, the performance of the bamboo fibers was tested, and the filling rate with the best performance was taken as the final filling rate. The processing time was recorded, and all bamboo fibers were cleaned. The specific data are shown in Table 5.

[0113] Table 5. Optimal filling rates obtained with different acid and alkali treatment times.

[0114]

[0115] According to Table 5, the bamboo fiber with the best performance was obtained when the filling rate of the bamboo fiber obtained after acid treatment for 60 min and alkali treatment for 60 min in Example 3 was 23.9%.

[0116] Experimental Example 1

[0117] This experimental example provides a method for enhancing the fibrous structure of bamboo fiber, specifically:

[0118] The bamboo fibers washed in Example 5 were dried, opened and moistened, and then combed and cross-laid with rollers. They were then fed into a needle punching machine for needle punching reinforcement to obtain bamboo fiber flakes.

[0119] The ordinary bamboo fiber wadding and the bamboo fiber wadding prepared in Example 5 were subjected to the following tests, and the results are summarized in Table 6.

[0120] (1) Tightness test: determined according to GB / T451.3;

[0121] (2) Bursting index test: determined according to GB / T1539;

[0122] (3) Quantitative testing: Samples shall be taken in accordance with GB / T740, and the standard atmosphere for sample treatment and testing shall be in accordance with GB / T10739.

[0123] Table 6. Enhancement Test of Bamboo Fiber Floss

[0124]

[0125] According to Table 6, the density of ordinary bamboo fiber wadding is 0.21 g / cm³. 3 The density of the bamboo fiber wadding prepared in Example 5 was significantly increased to 0.79 g / cm³. 3， Density is the mass per unit volume of a material, reflecting the degree of compactness of the material. Higher density means that the material is more compact and the structure is more stable.

[0126] The bursting index of ordinary bamboo fiber wadding is 0.75 kPa·m. 2 / g, while the bursting index of the bamboo fiber wadding prepared in Example 5 was increased to 1.19 kPa·m. 2 / g, the bursting index is an important parameter for evaluating a material's resistance to fracture, reflecting the material's strength and toughness.

[0127] The quantitative value of ordinary bamboo fiber wadding is 653 g / m³.2 The quantitative amount of bamboo fiber flocs prepared in Example 5 increased to 829 g / m³. 2 Quantity refers to the mass of material per unit area, reflecting the thickness and density of the material. A higher quantity means a denser material.

[0128] Based on the above analysis, the following conclusions can be drawn:

[0129] The bamboo fiber wadding prepared in Example 5 is superior to ordinary bamboo fiber wadding in terms of density and bursting index, and it has significant improvements in structural stability, strength and toughness; it also has an increased quantitative amount, which means that the material is thicker or denser.

[0130] 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 enhancing the fiber content of bamboo fibers in flocculent material production, characterized in that, Includes the following steps: S1. Select high-quality raw bamboo fibers, clean and cut the bamboo fibers to obtain bamboo fibers with a specification of 5-10cm after removing impurities; S2. The bamboo fiber obtained in S1 is immersed in an acid solution with a pH of 1.5-2.5 for treatment. The concentration of the acid solution is 0.5%-5%, and the acid treatment time is 75-80 minutes. During the treatment, samples are taken regularly to monitor the lignin content in the bamboo fiber. When the predetermined lignin removal rate is reached, the acid treatment is stopped, and bamboo fiber with lignin in the secondary wall is partially removed is obtained. The specific steps for monitoring the lignin content in bamboo fiber are as follows: S21. Collect bamboo fiber before processing as the monitoring object, and use Klason method or ultraviolet spectroscopy to test the initial lignin content, and record it as S0; S22. During the acid treatment process, take 2% of the sample every 20-25 minutes and test the lignin content using the method in S21. Record the result as S. n ; S23. Calculate the lignin removal rate. , compared with the predetermined lignin removal rate range S 预 For comparison, acid treatment was stopped when the lignin removal rate was within the predetermined lignin removal rate range; S3. The bamboo fiber obtained in S2 is immersed in an alkaline solution with a pH of 11-13 for treatment. The concentration of the alkaline solution is 2%-5%, and the alkaline treatment time is 45-60 minutes. During the treatment, the polysaccharide content in the bamboo fiber is monitored. The treatment is stopped when the predetermined polysaccharide removal rate is reached, and bamboo fiber with partial removal of polysaccharides in the secondary wall is obtained. The specific steps for monitoring the polysaccharide content in bamboo fiber are as follows: S31. Collect bamboo fiber before processing as the monitoring object, and test the initial polysaccharide content using the phenol-sulfuric acid method or high performance liquid chromatography, and record it as T0; S32. During the alkali treatment process, take 2% of the sample every 30-35 minutes and test the polysaccharide content using the method in S31. Record the result as T. n ; S33. Calculate the polysaccharide removal rate. , and the predetermined polysaccharide removal rate range T 预 For comparison, when the polysaccharide removal rate is within the predetermined polysaccharide removal rate range, the alkali treatment is stopped; S4. Place the bamboo fiber sample obtained in S3 into an ultrasonic cleaner, add filler and water, clean at 1200-1500W and detect the filling rate of the bamboo fiber in real time. At the same time, perform performance tests on the bamboo fiber, take the filling rate with the best performance as the final filling rate, record the processing time, and clean all the bamboo fiber. S5. The bamboo fibers washed in S4 are dried, opened and moistened, and then carded and cross-laid with rollers. They are then fed into a needle punching machine for needle punching reinforcement to obtain bamboo fiber flakes.

2. The method for enhancing bamboo fiber flocculation according to claim 1, characterized in that: In S23, the predetermined lignin removal rate range S 预 The steps to determine this are as follows: S231. Prepare several samples with different lignin removal rates of 10%, 30%, 50%, 70%, and 90% respectively. S232. Compare the strength and toughness of samples with different lignin removal rates in different bamboo fibers, and measure the strength and toughness parameters of each sample using mechanical testing equipment. S233. Select the degree to which the lignin removal rate optimizes the performance indicators of different bamboo fibers as the predetermined lignin removal rate range.

3. The method for enhancing bamboo fiber flocculation according to claim 1, characterized in that: In S2, the specific steps to stop the acid treatment include: rinsing the bamboo fiber with sodium carbonate solution until pH=7, then removing it, rinsing it with deionized water for 10-15 minutes, and then drying it.

4. The method for enhancing bamboo fiber flocculation according to claim 1, characterized in that: In S2, the acid solution used is either sulfuric acid solution or hydrochloric acid solution, wherein the concentration of sulfuric acid solution is 1%-5% and the concentration of hydrochloric acid solution is 0.5%-3%.

5. The method for enhancing bamboo fiber flocculation according to claim 1, characterized in that: In step S3, the alkaline solution used is either sodium hydroxide solution or potassium hydroxide solution.

6. The method for enhancing bamboo fiber flocculation according to claim 1, characterized in that: In S33, the predetermined polysaccharide removal rate range T 预 The steps to determine it are as follows: S331. Prepare several samples with different polysaccharide removal rates of 10%, 30%, 50%, 70%, and 90% respectively. S332. Compare the strength and toughness of samples with different polysaccharide removal rates in different bamboo fibers. Measure the strength and toughness parameters of each sample using mechanical testing equipment. S333. Select the polysaccharide removal rate that optimizes the performance indicators of different bamboo fibers as the predetermined polysaccharide removal rate range.

7. The method for enhancing bamboo fiber flocculation according to claim 1, characterized in that: In S4, the filler is one of calcium carbonate, silica, or talc.

8. The method for enhancing bamboo fiber flocculation according to claim 1, characterized in that: In step S3, the specific steps for stopping the alkali treatment include: rinsing the bamboo fiber with a dilute acetic acid solution until pH=7, then removing it, rinsing it with deionized water for 10-15 minutes, and then drying it.

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