Antibacterial bamboo-based fiber paper as well as preparation method and application thereof
By fermenting, cooking, and treating bamboo chips with nanocellulose, combined with guar gum and bio-gum technology, bamboo-based fiber paper with high strength and excellent antibacterial properties was prepared. This solved the problems of short bamboo pulp fiber length and low strength, and realized the efficient preparation and industrial application of bamboo-based paper yarn.
Patent Information
- Application Number
- CN202511885022.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-04-28
AI Technical Summary
Traditional bamboo pulp fibers are short, the preparation process is complex, the equipment is poorly adaptable, and the antibacterial components are severely lost, resulting in low strength of bamboo-based paper yarn, which is difficult to meet the requirements of practical applications.
Antibacterial bamboo-based fiber paper was prepared by fermenting and cooking a mixture of bamboo and moso bamboo chips, adding sodium hydroxide and anthraquinone, and then combining bamboo nanocellulose and cationic guar gum with papermaking and directional dehydration using a cylinder paper machine. Antibacterial bamboo-based paper yarn was further prepared by twisting and bio-glue treatment.
It improves the utilization rate and antibacterial properties of bamboo fiber, enhances the strength and flexibility of bamboo-based paper yarn, simplifies the preparation process, reduces equipment requirements, and is suitable for large-scale industrial production.
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Figure SMS_1
Abstract
Description
Technical Field
[0001] This invention relates to the field of textile materials technology, specifically to an antibacterial bamboo-based fiber paper, its preparation method, and its application. Background Technology
[0002] Bamboo fiber fabric refers to fabric woven from bamboo-based paper yarn made from bamboo (bamboo fibers are first made into bamboo-based yarn, and then spun into bamboo-based fiber fabric). It has advantages such as being soft and warm, antibacterial, moisture-wicking and breathable, UV-resistant, environmentally friendly, comfortable and beautiful, and has a very broad application prospect. However, the bamboo pulp fibers obtained by traditional processes are short (≤1.6mm), requiring viscose spinning to form yarn. This not only has problems such as complex preparation process, poor equipment adaptability, and significant loss (>30%) of the antibacterial components (bamboo kun) in bamboo fibers, but also results in bamboo-based paper yarn with low strength, which is difficult to fully meet the requirements of practical applications.
[0003] Therefore, it is of great significance to develop bamboo-based fiber paper and bamboo-based paper yarn with excellent antibacterial properties, high strength, good flexibility, simple preparation process and low equipment requirements. Summary of the Invention
[0004] The purpose of this invention is to provide an antibacterial bamboo-based fiber paper, its preparation method, and its application.
[0005] The technical solution adopted in this invention is: A method for preparing antibacterial bamboo-based fiber paper includes the following steps: 1) Mix bamboo chips and moso bamboo chips for biological fermentation, then add sodium hydroxide and anthraquinone and cook to obtain fermented bamboo pulp; 2) Add bamboo nanocellulose to fermented bamboo pulp, then beat the pulp to obtain paper pulp; 3) The pulp is made into paper, and then cationic guar gum solution is sprayed onto the surface of the paper before directional dehydration to obtain antibacterial bamboo-based fiber paper.
[0006] Preferably, the amount of the bamboo chips used in step 1) accounts for 30% to 70% of the total weight of the bamboo chips and moso bamboo chips.
[0007] Preferably, the length of the bamboo strip in step 1) is 50mm to 80mm, the width is 30mm to 50mm, and the thickness is 10mm to 20mm.
[0008] Preferably, the length of the bamboo strip in step 1) is 50mm to 80mm, the width is 30mm to 50mm, and the thickness is 10mm to 20mm.
[0009] Preferably, the biological fermentation in step 1) is carried out at room temperature for 30 to 45 days.
[0010] Preferably, the amount of sodium hydroxide used in step 1) is 8% to 10% of the dry weight of bamboo chips and moso bamboo chips.
[0011] Preferably, the amount of anthraquinone used in step 1) is 0.1% to 0.7% of the dry weight of bamboo chips and moso bamboo chips.
[0012] Preferably, the steaming in step 1) is carried out at a temperature of 130℃~140℃ for a steaming time of 55min~65min.
[0013] Preferably, the amount of bamboo nanocellulose used in step 2) is 0.8% to 1.2% of the dry weight of fermented bamboo pulp.
[0014] Preferably, the bamboo nanocellulose in step 2) is prepared by a method including the following steps: diluting the waste liquid generated during the preparation of antibacterial bamboo-based fiber paper with water, then performing chemical pretreatment (removing lignin / hemicellulose), and then performing high-pressure homogenization, ultrafine grinding, or ultrasonic mechanical defiberization to obtain an aqueous suspension of bamboo nanocellulose.
[0015] Preferably, the papermaking equipment used in step 3) is a cylinder paper machine with a speed of 50m / min to 100m / min and a width of 1000mm to 2000mm.
[0016] Preferably, the amount of cationic guar gum used in step 3) is 0.3% to 0.5% of the dry weight of the pulp.
[0017] Preferably, the solvent in the cationic guar gum solution in step 3) is water.
[0018] Preferably, the directional dehydration in step 3) includes the following step drying process: first, the heating rate is controlled at 2℃ / min to 5℃ / min to raise the temperature from room temperature to 75℃ to 85℃, then the cooling rate is controlled at 1℃ / min to 4℃ / min to lower the temperature to 55℃ to 65℃, and then the cooling rate is controlled at 1℃ / min to 2℃ / min to continue cooling down to 35℃ to 45℃.
[0019] An antibacterial bamboo-based fiber paper, which is prepared by the above-described method.
[0020] An antibacterial bamboo-based paper yarn, which is made from the aforementioned antibacterial bamboo-based fiber paper.
[0021] A method for preparing antibacterial bamboo-based paper yarn as described above includes the following steps: a) Preparation of bamboo-based paper yarn and bamboo pulp-based bio-adhesive: Preparation of bamboo-based paper yarn: Antibacterial bamboo-based fiber paper is cut into bamboo-based paper strips, and then twisted twice to obtain bamboo-based paper yarn; Preparation of bamboo pulp-based bio-adhesive: Bamboo powder, dispersant and water are mixed and swollen, then mechanically micro / nano-processed by a colloid mill or high-pressure homogenizer, and then a modifier is added and mixed evenly to obtain bamboo pulp-based bio-adhesive; b) The bamboo-based paper yarn is immersed in bamboo pulp-based bio-adhesive for sizing, then soaked in hot water and dried to obtain antibacterial bamboo-based paper yarn.
[0022] Preferably, the width of the bamboo-based paper strip in step a) is 1mm to 3mm.
[0023] Preferably, the count of the bamboo-based paper yarn in step a) is 10 to 60.
[0024] Preferably, the mass ratio of bamboo powder, dispersant, water and modifier in step a) is 1:0.01~0.5:20~200:0.01~1.
[0025] Preferably, the dispersant in step a) is at least one of polyacrylamide, polyethylene oxide, and carboxymethyl cellulose.
[0026] Preferably, the modifier in step a) is at least one of hydroxypropyl methylcellulose and methylcellulose.
[0027] Preferably, the temperature of the hot water in step b) is 75℃~85℃, and the soaking time is 10min~20min.
[0028] An antibacterial bamboo fiber fabric, which is woven from the aforementioned antibacterial bamboo-based paper yarn.
[0029] Application of an antibacterial bamboo fiber fabric as described above in the preparation of clothing, home textiles or medical textiles.
[0030] The beneficial effects of the present invention are: the antibacterial bamboo-based fiber paper of the present invention has the advantages of excellent antibacterial properties, high strength and good flexibility, and its preparation process is simple and the equipment requirements are low, making it suitable for large-scale industrial production and application.
[0031] Specifically: 1) The antibacterial bamboo-based fiber paper of the present invention has the advantages of excellent antibacterial properties, high strength and good flexibility. The antibacterial bamboo-based paper yarn made from it can replace chemical fibers in clothing, home textiles and medical textiles. 2) The method for preparing antibacterial bamboo-based fiber paper of the present invention has a high fiber utilization rate. By extracting bamboo nanocellulose from the waste liquid generated during the preparation of antibacterial bamboo-based fiber paper, the antibacterial bamboo-based fiber paper is enhanced, thereby increasing the raw material utilization rate by more than 30%. 3) The preparation method of the antibacterial bamboo-based fiber paper of the present invention is simple, requires low equipment, is energy-saving and environmentally friendly, and is suitable for large-scale industrial production and application. Detailed Implementation
[0032] The present invention will be further explained and described below with reference to specific embodiments.
[0033] Example 1: An antibacterial bamboo-based fiber paper, the preparation method of which is as follows: 1) Cut 3-year-old bamboo and 3-year-old moso bamboo into bamboo strips with a length of 50mm-80mm, a width of 30mm-50mm, and a thickness of 10mm-20mm. The mass ratio of bamboo strips to moso bamboo strips is 65:35. Then, pile the bamboo strips (pile height 10m±0.5m) and ferment at room temperature for 40 days. Then, add sodium hydroxide and anthraquinone and steam at 135℃ for 60 minutes. The amount of sodium hydroxide is 9% of the dry weight of bamboo strips and the amount of anthraquinone is 0.5% of the dry weight of bamboo strips. Perform a two-stage release, reducing the pressure from 0.5MPa to 0.1MPa to obtain fermented bamboo pulp. 2) Transfer the fermented bamboo pulp to a refiner, add bamboo nanocellulose and then beat it. The amount of bamboo nanocellulose is 1% of the dry weight of the fermented bamboo pulp, and the degree of beating is controlled at 28°SR to obtain pulp. 3) The pulp is transferred to a cylinder paper machine for papermaking. The pulp concentration is 0.05%, the machine speed is 70 m / min, and the width is 1000 mm. A cationic guar gum aqueous solution is then sprayed onto the paper surface, followed by directional dehydration through a stepped drying process. The amount of cationic guar gum used is 0.4% of the dry weight of the pulp. The stepped drying process is as follows: first, the temperature is raised from room temperature to 80°C at a controlled heating rate of 5°C / min; then, the temperature is lowered to 60°C at a controlled cooling rate of 3°C / min; finally, the temperature is lowered to 40°C at a controlled cooling rate of 2°C / min, resulting in antibacterial bamboo-based fiber paper (basis weight 15 g / m²). 2 The longitudinal and transverse tensile strength ratio is 6.2.
[0034] Note: The preparation method of bamboo nanocellulose is as follows: the waste liquid generated during the preparation of antibacterial bamboo-based fiber paper is diluted with water, then chemically pretreated (to remove lignin / hemicellulose), and then mechanically defibriled by high-pressure homogenization to obtain an aqueous suspension of bamboo nanocellulose.
[0035] An antibacterial bamboo-based paper yarn is prepared as follows: a) Preparation of bamboo-based paper yarn and bamboo pulp-based bio-adhesive: Preparation of bamboo-based paper yarn: The antibacterial bamboo-based fiber paper in this embodiment is cut into bamboo-based paper strips with a width of 1.5 mm, and then double-twisted at a pressure of 6.5 tons and a roller speed ratio of 1:1.3 to obtain bamboo-based paper yarn (count of 40). Preparation of bamboo pulp-based bio-adhesive: Bamboo powder, polyacrylamide, and water were stirred and mixed evenly, and then allowed to stand for 3 hours. The mixture was then mechanically micro / nano-processed using a colloid mill. Hydroxypropyl methylcellulose was added and stirred and mixed evenly. The mass ratio of bamboo powder, polyacrylamide, water, and hydroxypropyl methylcellulose was 1:0.02:40:0.05 to obtain bamboo pulp-based bio-adhesive (solid content of 4%). b) The bamboo-based paper yarn is immersed in bamboo pulp-based bio-glue for sizing, then soaked in hot water at 80℃ for 15 minutes, and then dried at 60℃ for 12 hours to obtain antibacterial bamboo-based paper yarn (diameter of 0.45 mm, tensile strength of 20.1 cN / tex).
[0036] According to tests, the production cycle of the antibacterial bamboo-based paper yarn in this embodiment (from bamboo raw material to paper yarn) is about 72 hours, and the energy consumption per ton of yarn is reduced from 110kWh to 85kWh (a reduction of about 23%) compared with the traditional paper yarn production process.
[0037] A knitted fabric, made from the antibacterial bamboo-based paper yarn of this embodiment, is woven on a circular knitting machine (30G) with a basis weight of 13g / m². 2 It has an air permeability of 550 mm / s and an antibacterial rate of 87.5% after 50 washes.
[0038] Example 2: An antibacterial bamboo-based fiber paper, the preparation method of which is as follows: 1) Cut 3-year-old bamboo and 3-year-old moso bamboo into bamboo strips with a length of 50mm-80mm, a width of 30mm-50mm, and a thickness of 10mm-20mm. The mass ratio of bamboo strips to moso bamboo strips is 35:65. Then, pile the bamboo strips (pile height 10m±0.5m) and ferment at room temperature for 30 days. Then, add sodium hydroxide and anthraquinone and steam at 135℃ for 60 minutes. The amount of sodium hydroxide is 9% of the dry weight of bamboo strips and the amount of anthraquinone is 0.15% of the dry weight of bamboo strips. Perform a two-stage release, reducing the pressure from 0.5MPa to 0.1MPa to obtain fermented bamboo pulp. 2) Transfer the fermented bamboo pulp to a refiner, add bamboo nanocellulose and then beat it. The amount of bamboo nanocellulose (same as in Example 1) is 1% of the dry weight of the fermented bamboo pulp, and the beating degree is controlled at 25°SR to obtain pulp. 3) The pulp is transferred to a cylinder paper machine for papermaking. The paper density is 2.5%, the machine speed is 60 m / min, and the width is 1000 mm. A cationic guar gum aqueous solution is then sprayed onto the paper surface, followed by directional dehydration through a stepped drying process. The amount of cationic guar gum used is 0.4% of the dry weight of the pulp. The stepped drying process is as follows: first, the temperature is raised from room temperature to 80°C at a controlled heating rate of 3°C / min; then, the temperature is lowered to 60°C at a controlled cooling rate of 2°C / min; finally, the temperature is lowered to 40°C at a controlled cooling rate of 1°C / min, resulting in antibacterial bamboo-based fiber paper (basis weight 15 g / m²). 2 (The longitudinal and transverse tensile strength ratio is 5.0).
[0039] An antibacterial bamboo-based paper yarn is prepared as follows: a) Preparation of bamboo-based paper yarn and bamboo pulp-based bio-adhesive: Preparation of bamboo-based paper yarn: The antibacterial bamboo-based fiber paper in this embodiment is cut into bamboo-based paper strips with a width of 2.5 mm, and then double-twisted at a pressure of 0.8 tons and a roller speed ratio of 1:1.2 to obtain bamboo-based paper yarn (count of 45). Preparation of bamboo pulp-based bio-adhesive: Bamboo powder, carboxymethyl cellulose, and water were stirred and mixed evenly, and then allowed to stand for 1.5 hours. The mixture was then mechanically micro / nano-processed using a colloid mill. Hydroxypropyl methyl cellulose was added and stirred and mixed evenly. The mass ratio of bamboo powder, carboxymethyl cellulose, water, and hydroxypropyl methyl cellulose was 1:0.2:50:0.04 to obtain bamboo pulp-based bio-adhesive (solid content of 2%). b) The bamboo-based paper yarn is immersed in bamboo pulp-based bio-glue for sizing, then soaked in hot water at 75°C for 15 minutes, and then dried at 50°C for 10 hours to obtain antibacterial bamboo-based paper yarn (diameter 0.40 mm, tensile strength 18.5 cN / tex).
[0040] According to the test, the production cycle of the antibacterial bamboo-based paper yarn in this embodiment is about 48 hours, and the energy consumption per ton of yarn is reduced from 110kWh to 95kWh (a reduction of about 14%) compared with the traditional paper yarn production process.
[0041] A lightweight fabric, woven on a circular knitting machine using the antibacterial bamboo-based paper yarn described in this embodiment, has a basis weight of 15 g / m². 2 It has an air permeability of 350 mm / s and an antibacterial rate of 87.5% after 50 washes.
[0042] Example 3: An antibacterial bamboo-based fiber paper, the preparation method of which is as follows: 1) Cut 3-year-old bamboo and 3-year-old moso bamboo into bamboo strips with a length of 50mm-80mm, a width of 30mm-50mm, and a thickness of 10mm-20mm. The mass ratio of bamboo strips to moso bamboo strips is 70:30. Then, pile the bamboo strips (pile height 10m±0.5m) and ferment at room temperature for 40 days. Then, add sodium hydroxide and anthraquinone and steam at 135℃ for 60 minutes. The amount of sodium hydroxide is 9% of the dry weight of bamboo strips and the amount of anthraquinone is 0.5% of the dry weight of bamboo strips. Perform a two-stage release, reducing the pressure from 0.5MPa to 0.1MPa to obtain fermented bamboo pulp. 2) Transfer the fermented bamboo pulp to a refiner, add bamboo nanocellulose and then beat it. The amount of bamboo nanocellulose (same as in Example 1) is 1% of the dry weight of the fermented bamboo pulp, and the degree of beating is controlled at 27°SR to obtain pulp. 3) The pulp is transferred to a cylinder paper machine for papermaking. The pulp concentration is 0.05%, the machine speed is 70 m / min, and the width is 1000 mm. A cationic guar gum aqueous solution is then sprayed onto the paper surface, followed by directional dehydration through a stepped drying process. The amount of cationic guar gum used is 0.4% of the dry weight of the pulp. The stepped drying process is as follows: first, the temperature is raised from room temperature to 80℃ at a controlled heating rate of 3℃ / min; then, the temperature is lowered to 60℃ at a controlled cooling rate of 2℃ / min; finally, the temperature is lowered to 40℃ at a controlled cooling rate of 1℃ / min, resulting in antibacterial bamboo-based fiber paper (basis weight 14 g / m²). 2 The longitudinal and transverse tensile strength ratio is 5.4.
[0043] An antibacterial bamboo-based paper yarn is prepared as follows: a) Preparation of bamboo-based paper yarn and bamboo pulp-based bio-adhesive: Preparation of bamboo-based paper yarn: The antibacterial bamboo-based fiber paper in this embodiment is cut into bamboo-based paper strips with a width of 1.5 mm, and then double-twisted at a pressure of 6.0 tons and a roller speed ratio of 1:1.3 to obtain bamboo-based paper yarn (count of 24). Preparation of bamboo pulp-based bio-adhesive: Bamboo powder, carboxymethyl cellulose, and water were stirred and mixed evenly, and then allowed to stand for 1.5 hours. The mixture was then mechanically micro / nano-processed using a colloid mill. Hydroxypropyl methyl cellulose was added and stirred and mixed evenly. The mass ratio of bamboo powder, carboxymethyl cellulose, water, and hydroxypropyl methyl cellulose was 1:0.2:50:0.4 to obtain bamboo pulp-based bio-adhesive (solid content of 2%). b) The bamboo-based paper yarn is immersed in bamboo pulp-based bio-adhesive for sizing, then soaked in hot water at 80℃ for 15 minutes, and then dried at 50℃ for 10 hours to obtain antibacterial bamboo-based paper yarn (diameter of 0.40 mm, tensile strength of 20.0 cN / tex).
[0044] According to the test, the production cycle of the antibacterial bamboo-based paper yarn in this embodiment is about 60 hours, and the energy consumption per ton of yarn is reduced from 110kWh to 90kWh (a reduction of about 18%) compared with the traditional paper yarn production process.
[0045] A sportswear fabric, woven on a circular knitting machine using the antibacterial bamboo-based paper yarn described in this embodiment, has a basis weight of 14 g / m². 2 It has an air permeability of 560 mm / s and an antibacterial rate of 88.2% after 30 washes.
[0046] Example 4: An antibacterial bamboo-based fiber paper, the preparation method of which is as follows: 1) Cut 3-year-old bamboo and 3-year-old moso bamboo into bamboo strips with a length of 50mm-80mm, a width of 30mm-50mm, and a thickness of 10mm-20mm. The mass ratio of bamboo strips to moso bamboo strips is 65:35. Then, pile the bamboo strips (pile height 10m±0.5m) and ferment at room temperature for 40 days. Then, add sodium hydroxide and anthraquinone and steam at 135℃ for 60 minutes. The amount of sodium hydroxide is 8.5% of the dry weight of bamboo strips and the amount of anthraquinone is 0.5% of the dry weight of bamboo strips. Perform a two-stage release, reducing the pressure from 0.5MPa to 0.1MPa to obtain fermented bamboo pulp. 2) Transfer the fermented bamboo pulp to a refiner, add bamboo nanocellulose and then beat it. The amount of bamboo nanocellulose (same as in Example 1) is 1% of the dry weight of the fermented bamboo pulp, and the degree of beating is controlled at 28°SR to obtain pulp. 3) The pulp is transferred to a cylinder paper machine for papermaking. The pulp concentration is 0.05%, the machine speed is 70 m / min, and the width is 1500 mm. A cationic guar gum aqueous solution is then sprayed onto the paper surface, followed by directional dehydration through a stepped drying process. The amount of cationic guar gum used is 0.4% of the dry weight of the pulp. The stepped drying process is as follows: first, the temperature is raised from room temperature to 80°C at a controlled heating rate of 4°C / min; then, the temperature is lowered to 60°C at a controlled cooling rate of 3°C / min; finally, the temperature is lowered to 40°C at a controlled cooling rate of 2°C / min, resulting in antibacterial bamboo-based fiber paper (basis weight 13 g / m²). 2 The longitudinal and transverse tensile strength ratio is 6.2.
[0047] An antibacterial bamboo-based paper yarn is prepared as follows: a) Preparation of bamboo-based paper yarn and bamboo pulp-based bio-adhesive: Preparation of bamboo-based paper yarn: The antibacterial bamboo-based fiber paper in this embodiment is cut into bamboo-based paper strips with a width of 1.2 mm, and then double-twisted at a pressure of 6.8 tons and a roller speed ratio of 1:1.4 to obtain bamboo-based paper yarn (count of 40). Preparation of bamboo pulp-based bio-adhesive: Bamboo powder, carboxymethyl cellulose, and water were stirred and mixed evenly, and then allowed to stand for 1.5 hours. The mixture was then mechanically micro / nano-processed using a colloid mill. Hydroxypropyl methyl cellulose was added and stirred and mixed evenly. The mass ratio of bamboo powder, carboxymethyl cellulose, water, and hydroxypropyl methyl cellulose was 1:0.2:50:0.6 to obtain bamboo pulp-based bio-adhesive (solid content of 2%). b) The bamboo-based paper yarn is immersed in bamboo pulp-based bio-glue for sizing, then soaked in hot water at 80℃ for 15 minutes, and then dried at 75℃ for 1 hour to obtain antibacterial bamboo-based paper yarn (diameter of 0.50 mm, tensile strength of 25.0 cN / tex).
[0048] According to the test, the production cycle of the antibacterial bamboo-based paper yarn in this embodiment is about 50 hours, and the energy consumption per ton of yarn is reduced from 110kWh to 100kWh (a reduction of about 9%) compared with the traditional paper yarn production process.
[0049] A shirt fabric, woven on a circular knitting machine using the antibacterial bamboo-based paper yarn described in this embodiment, has a basis weight of 12 g / m². 2 It has an air permeability of 350 mm / s and an antibacterial rate of 85.0% after 20 washes.
[0050] Example 5: An antibacterial bamboo-based fiber paper, the preparation method of which is as follows: 1) Cut 3-year-old bamboo and 3-year-old moso bamboo into bamboo strips with a length of 50mm-80mm, a width of 30mm-50mm, and a thickness of 10mm-20mm. The mass ratio of bamboo strips to moso bamboo strips is 60:40. Then, pile the bamboo strips (pile height 10m±0.5m) and ferment at room temperature for 40 days. Then, add sodium hydroxide and anthraquinone and steam at 135℃ for 60 minutes. The amount of sodium hydroxide is 9.5% of the dry weight of bamboo strips and the amount of anthraquinone is 0.5% of the dry weight of bamboo strips. Perform a two-stage release, reducing the pressure from 0.5MPa to 0.1MPa to obtain fermented bamboo pulp. 2) Transfer the fermented bamboo pulp to a refiner, add bamboo nanocellulose and then beat it. The amount of bamboo nanocellulose (same as in Example 1) is 0.8% of the dry weight of the fermented bamboo pulp, and the beating degree is controlled at 25°SR to obtain pulp. 3) The pulp is transferred to a cylinder paper machine for papermaking. The pulp concentration is 0.05%, the machine speed is 70 m / min, and the width is 2000 mm. A cationic guar gum aqueous solution is then sprayed onto the paper surface, followed by directional dehydration through a stepped drying process. The amount of cationic guar gum used is 0.4% of the dry weight of the pulp. The stepped drying process is as follows: first, the temperature is raised from room temperature to 80°C at a controlled heating rate of 5°C / min; then, the temperature is lowered to 60°C at a controlled cooling rate of 4°C / min; finally, the temperature is lowered to 40°C at a controlled cooling rate of 2°C / min, resulting in antibacterial bamboo-based fiber paper (basis weight 15 g / m²).2 The longitudinal and transverse tensile strength ratio is 5.6.
[0051] An antibacterial bamboo-based paper yarn is prepared as follows: a) Preparation of bamboo-based paper yarn and bamboo pulp-based bio-adhesive: Preparation of bamboo-based paper yarn: The antibacterial bamboo-based fiber paper in this embodiment is cut into bamboo-based paper strips with a width of 2.0 mm, and then double-twisted at a pressure of 5.5 tons and a roller speed ratio of 1:1.25 to obtain bamboo-based paper yarn (count of 12). Preparation of bamboo pulp-based bio-adhesive: Bamboo powder, carboxymethyl cellulose, and water were stirred and mixed evenly, and then allowed to stand for 3 hours. The mixture was then mechanically micro / nano-processed using a colloid mill. Hydroxypropyl methyl cellulose was added and stirred and mixed evenly. The mass ratio of bamboo powder, carboxymethyl cellulose, water, and hydroxypropyl methyl cellulose was 1:0.2:70:0.4 to obtain bamboo pulp-based bio-adhesive (solid content of 2%). b) The bamboo-based paper yarn is immersed in bamboo pulp-based bio-glue for sizing, then soaked in hot water at 80℃ for 10 minutes, and then dried at 75℃ for 4 hours to obtain antibacterial bamboo-based paper yarn (diameter of 0.60 mm, tensile strength of 30.0 cN / tex).
[0052] According to the test, the production cycle of the antibacterial bamboo-based paper yarn in this embodiment is about 60 hours, and the energy consumption per ton of yarn is reduced from 110kWh to 100kWh (a reduction of about 9%) compared with the traditional paper yarn production process.
[0053] A medical gauze, woven from the antibacterial bamboo-based paper yarn of this embodiment using a circular knitting machine, has a basis weight of 15 g / m². 2 It has an air permeability of 720 mm / s and an antibacterial rate of 85.0% after 50 washes.
[0054] Example 6: An antibacterial bamboo-based fiber paper, the preparation method of which is as follows: 1) Cut 3-year-old bamboo and 3-year-old moso bamboo into bamboo strips with a length of 50mm-80mm, a width of 30mm-50mm, and a thickness of 10mm-20mm. The mass ratio of bamboo strips to moso bamboo strips is 70:30. Then, pile the bamboo strips (pile height 10m±0.5m) and ferment at room temperature for 40 days. Then, add sodium hydroxide and anthraquinone and steam at 135℃ for 60 minutes. The amount of sodium hydroxide is 8.8% of the dry weight of bamboo strips and the amount of anthraquinone is 0.5% of the dry weight of bamboo strips. Perform a two-stage release, reducing the pressure from 0.5MPa to 0.1MPa to obtain fermented bamboo pulp. 2) Transfer the fermented bamboo pulp to a refiner, add bamboo nanocellulose and then beat it. The amount of bamboo nanocellulose (same as in Example 1) is 1.2% of the dry weight of the fermented bamboo pulp, and the degree of beating is controlled at 29°SR to obtain pulp. 3) The pulp is transferred to a cylinder paper machine to form paper. The paper density is 0.05%, the machine speed is 70 m / min, and the width is 1000 mm. A cationic guar gum aqueous solution is then sprayed onto the paper surface, followed by directional dehydration through a stepped drying process. The amount of cationic guar gum used is 0.4% of the dry weight of the pulp. The stepped drying process is as follows: first, the temperature is raised from room temperature to 80℃ at a controlled heating rate of 6℃ / min; then, the temperature is lowered to 60℃ at a controlled cooling rate of 3℃ / min; finally, the temperature is lowered to 40℃ at a controlled cooling rate of 2℃ / min, resulting in antibacterial bamboo-based fiber paper (basis weight 12 g / m²). 2 The longitudinal and transverse tensile strength ratio is 6.2.
[0055] An antibacterial bamboo-based paper yarn is prepared as follows: a) Preparation of bamboo-based paper yarn and bamboo pulp-based bio-adhesive: Preparation of bamboo-based paper yarn: The antibacterial bamboo-based fiber paper in this embodiment is cut into bamboo-based paper strips with a width of 1.0 mm, and then double-twisted at a pressure of 7.0 tons and a roller speed ratio of 1:1.4 to obtain bamboo-based paper yarn (60 count). Preparation of bamboo pulp-based bio-adhesive: Bamboo powder, carboxymethyl cellulose and water were stirred and mixed evenly, and then allowed to stand for 4 hours. Then, mechanical micro / nano processing was performed using a colloid mill. Hydroxypropyl methyl cellulose was added and stirred and mixed evenly. The mass ratio of bamboo powder, carboxymethyl cellulose, water and hydroxypropyl methyl cellulose was 1:0.5:50:1 to obtain bamboo pulp-based bio-adhesive (solid content of 5%). b) The bamboo-based paper yarn is immersed in bamboo pulp-based bio-adhesive for sizing, then soaked in hot water at 80°C for 15 minutes, and then dried at 80°C for 2 hours to obtain antibacterial bamboo-based paper yarn (diameter 0.45 mm, tensile strength 20.1 cN / tex).
[0056] According to the test, the production cycle of the antibacterial bamboo-based paper yarn in this embodiment is about 48 hours, and the energy consumption per ton of yarn is reduced from 110kWh to 90kWh (a reduction of about 18%) compared with the traditional paper yarn production process.
[0057] A knitted fabric, woven on a circular knitting machine using the antibacterial bamboo-based paper yarn described in this embodiment, has a basis weight of 11 g / m². 2 It has an air permeability of 530 mm / s and an antibacterial rate of 90.0% after 20 washes.
[0058] Performance testing: The performance test data of the antibacterial bamboo-based fiber paper in Examples 1-6 are shown in the table below: Table 1 Performance test data of antibacterial bamboo-based fiber paper
[0059] Note: Tensile strength and elongation: Tested according to "GB / T 12914-2018 Determination of tensile strength of paper and paperboard by constant speed tensile test (20 mm / min)".
[0060] Antibacterial rate: Tested in accordance with "GB / T 20944.2-2007 Evaluation of antibacterial properties of textiles - Part 2: Absorption method".
[0061] As shown in Table 1, the antibacterial bamboo-based fiber paper in Examples 1 to 6 has the advantages of low basis weight, thinness, high strength, good flexibility and excellent antibacterial properties. It is suitable for cutting into strips to make antibacterial bamboo-based paper yarn, which can replace chemical fibers in clothing, home textiles and medical textiles.
[0062] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.
Claims
1. A method for preparing antibacterial bamboo-based fiber paper, characterized in that, Includes the following steps: 1) Mix bamboo chips and moso bamboo chips for biological fermentation, then add sodium hydroxide and anthraquinone and cook to obtain fermented bamboo pulp; 2) Add bamboo nanocellulose to fermented bamboo pulp, then beat the pulp to obtain paper pulp; 3) The pulp is made into paper, and then cationic guar gum solution is sprayed onto the surface of the paper before directional dehydration to obtain antibacterial bamboo-based fiber paper.
2. The method for preparing antibacterial bamboo-based fiber paper according to claim 1, characterized in that: Step 1) The amount of *Ciba moss* chips is 30% to 70% of the total weight of *Ciba moss* chips and *Phyllostachys edulis* chips; Step 1) The amount of sodium hydroxide is 8% to 10% of the dry weight of *Ciba moss* chips and *Phyllostachys edulis* chips; Step 1) The amount of anthraquinone is 0.1% to 0.7% of the dry weight of *Ciba moss* chips and *Phyllostachys edulis* chips; Step 2) The amount of bamboo nanocellulose is 0.8% to 1.2% of the dry weight of fermented bamboo pulp; Step 3) The amount of cationic guar gum is 0.3% to 0.5% of the dry weight of pulp.
3. The method for preparing antibacterial bamboo-based fiber paper according to claim 1 or 2, characterized in that: The biological fermentation in step 1) is carried out at room temperature for 30 to 45 days; the cooking in step 1) is carried out at a temperature of 130°C to 140°C for 55 to 65 minutes.
4. The method for preparing antibacterial bamboo-based fiber paper according to claim 1 or 2, characterized in that: Step 3) The papermaking equipment used is a cylinder paper machine with a speed of 50m / min to 100m / min and a width of 1000mm to 2000mm; Step 3) The directional dewatering includes the following step drying process: first, the heating rate is controlled at 2℃ / min to 5℃ / min to raise the temperature from room temperature to 75℃ to 85℃, then the cooling rate is controlled at 1℃ / min to 4℃ / min to lower the temperature to 55℃ to 65℃, and then the cooling rate is controlled at 1℃ / min to 2℃ / min to continue cooling to 35℃ to 45℃.
5. An antibacterial bamboo-based fiber paper, characterized in that, It is prepared by the preparation method described in any one of claims 1 to 4.
6. An antibacterial bamboo-based paper yarn, characterized in that, Made from the antibacterial bamboo-based fiber paper as described in claim 5.
7. A method for preparing antibacterial bamboo-based paper yarn as described in claim 6, characterized in that, Includes the following steps: a) Preparation of bamboo-based paper yarn and bamboo pulp-based bio-adhesive: Preparation of bamboo-based paper yarn: Antibacterial bamboo-based fiber paper is cut into bamboo-based paper strips, and then twisted twice to obtain bamboo-based paper yarn; Preparation of bamboo pulp-based bio-adhesive: Bamboo powder, dispersant and water are mixed and swollen, then mechanically micro / nano-processed by a colloid mill or high-pressure homogenizer, and then a modifier is added and mixed evenly to obtain bamboo pulp-based bio-adhesive; b) The bamboo-based paper yarn is immersed in bamboo pulp-based bio-adhesive for sizing, then soaked in hot water and dried to obtain antibacterial bamboo-based paper yarn.
8. The method for preparing antibacterial bamboo-based paper yarn according to claim 7, characterized in that: The width of the bamboo-based paper strip in step a) is 1mm to 3mm; the count of the bamboo-based paper yarn in step a) is 10 to 60; the mass ratio of bamboo powder, dispersant, water, and modifier in step a) is 1:0.01 to 0.5:20 to 200:0.01 to 1; the dispersant in step a) is at least one of polyacrylamide, polyethylene oxide, and carboxymethyl cellulose; the modifier in step a) is at least one of hydroxypropyl methylcellulose and methylcellulose; the temperature of the hot water in step b) is 75℃ to 85℃, and the soaking time is 10min to 20min.
9. An antibacterial bamboo fiber fabric, characterized in that, It is woven from the antibacterial bamboo-based paper yarn as described in claim 6.
10. The application of the antibacterial bamboo fiber fabric as described in claim 9 in the preparation of clothing, home textiles or medical textiles.