A dry bulked paper and a method of making the same

Abstract

The application is suitable for the technical field of bulking paper, and provides a dry bulking paper and a manufacturing method thereof.The dry bulking paper is composed of wood pulp fibers and hot-bonding chemical fibers, and functional powder is uniformly distributed in the dry bulking paper.The mass ratio of the wood pulp fibers, the hot-bonding chemical fibers and the functional powder is 2-5:2-3:1.The functional powder comprises the following raw materials: modified chitosan, modified polyethylene glycol, modified nano-bentonite, paeoniflorin and modified corn protein.The dry bulking paper provided by the application improves the performance of the dry bulking paper by adding the functional powder, improves the antibacterial property, the mechanical property and the adsorption property by adding the modified chitosan, has good adsorption property by adding the modified polyethylene glycol, has a structure with more fine pores and improves the adsorption property and the dispersibility by adding the modified nano-bentonite, has better water absorption and better film-forming property by adding the modified corn protein, improves the mechanical property of the film, and improves the antibacterial property.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bulking paper, and particularly relates to a dry bulking paper and a manufacturing method thereof. BACKGROUND

[0002] The dry bulking paper (dustless paper) is also called dry papermaking non-woven fabric, which is a kind of dry non-woven fabric. The dustless paper has unique physical properties, such as high elasticity, softness, hand feeling and excellent drape, and has high water absorption and good water retention, and is widely used in the fields of sanitary nursing supplies, special medical supplies and industrial wiping supplies.

[0003] The dry bulking paper circulating in the market today is only composed of ordinary wood pulp, hot-bonding chemical fiber and a certain amount of high molecular water absorbent, and only has the function of simply absorbing liquid, so it has single function. For example, if the antibacterial property is not possessed, the use demand cannot be met. SUMMARY

[0004] The application provides a dry bulking paper, and aims to solve the above problems.

[0005] The application is achieved in the following manner. The dry bulking paper is composed of wood pulp fiber and hot-bonding chemical fiber, and functional powder is uniformly distributed in the dry bulking paper, the mass ratio of the wood pulp fiber, the hot-bonding chemical fiber and the functional powder is 2-5:2-3:1, and the functional powder comprises the following raw materials in parts by weight: 10-15 parts of modified chitosan, 2-5 parts of modified polyethylene glycol, 4-8 parts of modified nano-bentonite, 1-3 parts of paeoniflorin and 1-2 parts of modified corn protein.

[0006] Preferably, the functional powder comprises the following raw materials in parts by weight: 11-14 parts of modified chitosan, 2.5-4.5 parts of modified polyethylene glycol, 5-7 parts of modified nano-bentonite, 1.5-2.5 parts of paeoniflorin and 1.2-1.8 parts of modified corn protein.

[0007] Preferably, the functional powder comprises the following raw materials in parts by weight: 12.5 parts of modified chitosan, 3.5 parts of modified polyethylene glycol, 6 parts of modified nano-bentonite, 2 parts of paeoniflorin and 1.5 parts of modified corn protein.

[0008] Preferably, the preparation method of the modified chitosan is as follows: 8-12 parts of chitosan is dissolved in 10-20 times weight and 2-6% concentration of acetic acid aqueous solution by weight parts, the obtained solution is ultrasonically treated in an ultrasonic cleaner, fractionated by polyvinylidene fluoride ultrafiltration membrane, 6-8 parts of anhydrous ethanol is added while stirring, then the PH is adjusted to neutral, 6-10 parts of epichlorohydrin is added, and stirring is conducted for 30-50 min to obtain the modified chitosan; the chitosan is first ultrasonically treated and fractionated to obtain chitosan with a better molecular level range, ethanol is added to form pores, and epichlorohydrin is crosslinked to improve the antibacterial property, mechanical property and adsorption property of the chitosan.

[0009] Preferably, the ultrasonic treatment is performed at an ultrasonic frequency of 20-25 kHz and a power of 200-240 W for 30-50 min.

[0010] Preferably, the preparation method of the modified polyethylene glycol is as follows: 6-10 parts of polyethylene glycol is added into 5-8 times weight of water by weight parts, then 2-3 parts of polyaspartic acid is added, stirring is conducted for 30-50 min, 0.5-1 part of nano activated carbon is added, stirring is conducted for 30-50 min, and the modified polyethylene glycol is obtained after freeze-drying, which has good adsorption property.

[0011] Preferably, the preparation method of the modified nano-bentonite is as follows: 10-20 parts of nano-bentonite is placed in a muffle furnace and programmed to heat to 500-600℃, constant temperature roasting is conducted for 2 h, then water vapor is introduced for 30-50 min, then water 6-10 times the mass of the nano-bentonite and lignosulfonate sodium 0.1-0.3 times the mass of the bentonite are added to form a suspension slurry, the upper suspension liquid is centrifuged in a centrifuge at 2000-4000 r / min for 10 min, vacuum filtration is conducted, and the modified nano-bentonite is obtained by spray drying; the nano-bentonite is first calcined and then water vapor is introduced to expand the pores, so that the bentonite has a finer and more porous structure, the adsorption property is improved, and then the lignosulfonate sodium is added to improve the dispersibility of the bentonite.

[0012] Preferably, the preparation method of the modified corn protein is as follows: 6-8 parts of corn protein is added into an ethanol solution 5-8 times the mass of the corn protein and having a concentration of 80-90%, then 1-3 parts of soybean protein isolate and 0.1-0.3 parts of quercetin are added, stirring is conducted at 40-50℃ for 40-60 min, and then drying is conducted at 80-90℃ for 2-3 h to obtain the modified corn protein; the soybean protein isolate and quercetin are added to improve the water absorption of the corn protein, the film-forming property is better, the mechanical property of the film is improved, and the antibacterial property is improved.

[0013] The application further provides a preparation method of the dry puffing paper.

[0014] The raw materials are weighed according to the proportion;

[0015] The wood pulp fibers and the thermally bonded chemical fibers are formed into a web by using air laying technology;

[0016] The modified chitosan, modified polyethylene glycol, modified nano-bentonite and paeonol are mixed uniformly by using mechanical oscillation method, and then are scattered on the web of wood pulp fibers and are sucked into the web by using air suction method;

[0017] The modified corn protein is scattered on the web of the thermally bonded chemical fibers by using mechanical oscillation method, and is sucked into the web by using air suction method;

[0018] The two webs are heated and bonded to form a dry expanded paper.

[0019] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0020] The dry expanded paper provided by the present application has improved performance by adding functional powder, improved antibacterial property, mechanical property and adsorption property by adding modified chitosan, good adsorption property by adding modified polyethylene glycol, finer and more porous structure by adding modified nano-bentonite, good dispersibility and improved adsorption property, better water absorption and film forming property by adding modified corn protein, improved mechanical property of the film, and improved antibacterial property. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a process flow chart of the manufacturing method of the dry expanded paper provided by the present application. DETAILED DESCRIPTION

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the description and the claims herein and the above description of drawings herein contain terminology that the applicant believes are not under patent or application in other publications by others, or otherwise available under the doctrine of equivalents to the extent the terminology is used merely to describe certain embodiments. It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application cover modifications and variations of this application provided they come within the scope of the appended claims and their equivalents.

[0023] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiments. It is explicitly contemplated that embodiments described herein can be combined with each other, even though some combinations can not explicitly be set forth below.

[0024] Embodiment 1

[0025] The embodiment of the present application provides a dry bulking paper, which is composed of wood pulp fibers and hot-bonding chemical fibers, and functional powder is uniformly distributed in the dry bulking paper, a mass ratio of the wood pulp fibers, the hot-bonding chemical fibers and the functional powder is 2:2:1, and the functional powder comprises the following raw materials in parts by weight: 10 parts of modified chitosan, 2 parts of modified polyethylene glycol, 4 parts of modified nano-bentonite, 1 part of paeoniflorin and 1 part of modified corn protein. Figure 1

[0026] The dry bulking paper is prepared by the following steps.

[0027] The raw materials are weighed according to the proportion.

[0028] The wood pulp fibers and the hot-bonding chemical fibers are formed into a web by using air-laid technology.

[0029] The modified chitosan, the modified polyethylene glycol, the modified nano-bentonite and the paeoniflorin are mixed uniformly by using mechanical oscillation method, and then are scattered on the web made of the wood pulp fibers and are sucked into the web by using air suction method.

[0030] The modified corn protein is scattered on the web made of the hot-bonding chemical fibers by using mechanical oscillation method and is sucked into the web by using air suction method.

[0031] The two webs are heated and bonded to form a dry bulking paper.

[0032] The modified chitosan is prepared by the following method: 8 parts of chitosan are dissolved in 10 times weight of 2% acetic acid aqueous solution, the obtained solution is subjected to ultrasonic treatment in an ultrasonic cleaner, is subjected to grading by using a polyvinylidene fluoride ultrafiltration membrane, 6 parts of anhydrous ethanol is added while stirring, then the PH value is adjusted to neutral, 6 parts of epichlorohydrin is added, and stirring is performed for 30 min, so that the modified chitosan is obtained, the ultrasonic treatment is performed at an ultrasonic frequency of 20 kHz and a power of 200 W for 30 min.

[0033] In the embodiment, the modified polyethylene glycol is prepared by the following method: 6 parts of polyethylene glycol is added into 5 times weight of water, then 2 parts of polyaspartic acid is added, stirring is performed for 30 min, 0.5 parts of nano-activated carbon is added, stirring is performed for 30 min, and the modified polyethylene glycol is obtained after freeze-drying.

[0034] ​Preferably, the modified nano-bentonite is prepared as follows: 10 parts by weight of nano-bentonite are placed in a muffle furnace and heated to 500°C. The mixture is then calcined at this temperature for 2 hours, followed by the introduction of steam for 30 minutes. Then, water equal to 6 times the mass of the nano-bentonite and sodium lignosulfonate equal to 0.1.3 times the mass of the bentonite are added and stirred to form a suspension slurry. The upper suspension is centrifuged at 2000 r / min for 10 minutes, vacuum filtered, and spray-dried to obtain the modified nano-bentonite.

[0035] In a specific implementation, the modified zein is prepared as follows: Take 6 parts by weight of zein and add them to an ethanol solution with a concentration of 80% and a mass of 5 times that of zein. Then add 1 part of soy protein isolate and 0.1 part of quercetin. Stir at 40°C for 40 min and then dry at 80°C for 2 h to obtain modified zein.

[0036] Example 2

[0037] This invention provides a dry-process expanded paper, such as... Figure 1 As shown, it is composed of wood pulp fiber and thermally bonded chemical fiber, with functional powder uniformly distributed within it. The mass ratio of wood pulp fiber, thermally bonded chemical fiber, and functional powder is 2.5:2.5:1. The functional powder includes the following raw materials in parts by weight: 11 parts modified chitosan, 2.5 parts modified polyethylene glycol, 5 parts modified nano-bentonite, 1.5 parts paeoniflorin, and 1.2 parts modified zein.

[0038] The method for producing the dry-process expanded paper includes the following steps:

[0039] Weigh each ingredient according to the proportions;

[0040] Wood pulp fiber and thermally bonded chemical fiber are web-formed using airflow web-forming technology;

[0041] Modified chitosan, modified polyethylene glycol, modified nano-bentonite, and paeoniflorin were mixed evenly using a mechanical vibration method and then sprinkled onto a fiber mesh made of wood pulp fibers. The mixture was then drawn into the fiber mesh using a suction method.

[0042] Modified corn gluten was spread onto a fiber mesh made of thermally bonded chemical fiber using a mechanical vibration method and then sucked into the fiber mesh using a suction method.

[0043] Two layers of fiber web are heated and bonded together, then cut to obtain dry-process expanded paper.

[0044] The modified chitosan is prepared as follows: 8 parts by weight of chitosan are dissolved in 10 times their weight of a 2% acetic acid aqueous solution. The resulting solution is ultrasonically treated in an ultrasonic cleaner, fractionated using a polyvinylidene fluoride ultrafiltration membrane, and 6 parts of anhydrous ethanol are added while stirring. The pH is then adjusted to neutral, and 6 parts of epichlorohydrin are added. The mixture is stirred for 30 minutes to obtain the modified chitosan. The ultrasonic frequency of the ultrasonic treatment is 20 kHz, the power is 200 W, and the treatment time is 30 minutes.

[0045] In this embodiment, the modified polyethylene glycol is prepared as follows: by weight, 6 parts of polyethylene glycol are taken, added to 5 times the weight of water, then 2 parts of polyaspartic acid are added, stirred for 30 minutes, then 0.5 parts of nano-activated carbon are added, stirred for 30 minutes, and then freeze-dried to obtain modified polyethylene glycol.

[0046] Preferably, the modified nano-bentonite is prepared as follows: 10 parts by weight of nano-bentonite are placed in a muffle furnace and heated to 500°C under programmed temperature. The mixture is then calcined at a constant temperature for 2 hours, followed by the introduction of steam for 30 minutes. Then, water with a mass of 6 times that of nano-bentonite and sodium lignosulfonate with a mass of 0.1 times that of bentonite are added and stirred to form a suspension slurry. The upper suspension is centrifuged at 2000 r / min for 10 minutes, vacuum filtered, and spray-dried to obtain the modified nano-bentonite.

[0047] In a specific implementation, the modified zein is prepared as follows: Take 6 parts by weight of zein and add them to an ethanol solution with a concentration of 80% and a mass of 5 times that of zein. Then add 1 part of soy protein isolate and 0.1 part of quercetin. Stir at 40°C for 40 min and then dry at 80°C for 2 h to obtain modified zein.

[0048] Example 3

[0049] This invention provides a dry-process expanded paper, such as... Figure 1 As shown, it is composed of wood pulp fiber and thermally bonded chemical fiber, with functional powder uniformly distributed within it. The mass ratio of wood pulp fiber, thermally bonded chemical fiber, and functional powder is 3.5:2.5:1. The functional powder includes the following raw materials in parts by weight: 12.5 parts modified chitosan, 3.5 parts modified polyethylene glycol, 6 parts modified nano-bentonite, 2 parts paeoniflorin, and 1.5 parts modified zein.

[0050] The method for producing the dry-process expanded paper includes the following steps:

[0051] Weigh each ingredient according to the proportions;

[0052] Wood pulp fiber and thermally bonded chemical fiber are web-formed using airflow web-forming technology;

[0053] The modified chitosan, modified polyethylene glycol, modified nano-bentonite and paeonol are mixed uniformly by mechanical oscillation method, and then are scattered on the web made of wood pulp fibers and are sucked into the web by air suction method;

[0054] The modified corn protein is scattered on the web made of heat-bonded chemical fibers by mechanical oscillation method and is sucked into the web by air suction method, and the hydrophobicity of the modified corn protein is used to prevent water from seeping downward.

[0055] The two webs are heat-bonded to form a shape, and are cut to obtain the dry expanded paper.

[0056] The modified chitosan is prepared by the following method: 10 parts of chitosan are dissolved in 15 times by weight of a 4% acetic acid aqueous solution, the obtained solution is subjected to ultrasonic treatment in an ultrasonic cleaner, is subjected to grading by using a polyvinylidene fluoride ultrafiltration membrane, 7 parts of anhydrous ethanol is added while stirring, the pH is adjusted to be neutral, 8 parts of epichlorohydrin is added, and stirring is performed for 40 min to obtain the modified chitosan.

[0057] In the embodiment, the modified polyethylene glycol is prepared by the following method: 8 parts of polyethylene glycol is added into 6.5 times by weight of water, 2.5 parts of polyaspartic acid is then added, stirring is performed for 40 min, 0.75 parts of nano-activated carbon is then added, stirring is performed for 40 min, and the modified polyethylene glycol is obtained after freeze-drying.

[0058] Preferably, the modified nano-bentonite is prepared by the following method: 15 parts of nano-bentonite is placed in a muffle furnace and is subjected to programmed heating to 550 DEG C for 2 h, water vapor is then introduced for 40 min, 8 times by weight of water and 0.2 times by weight of sodium lignosulfonate are then added to form a suspension slurry, the upper suspension liquid is subjected to centrifugal treatment at 3000 r / min for 10 min in a centrifuge, vacuum filtration is performed, and the modified nano-bentonite is obtained by spray drying.

[0059] In the embodiment, the modified corn protein is prepared by the following method: 7 parts of corn protein is added into 6.5 times by weight of an 85% ethanol solution, 2 parts of soybean protein isolate and 0.2 parts of quercetin are then added, stirring is performed at 45 DEG C for 50 min, and the modified corn protein is obtained after drying at 85 DEG C for 2.5 h.

[0060] Example 4

[0061] The embodiment of the present application provides a dry expanded paper, which is prepared by the following method: Figure 1As shown, the wood pulp fiber and the heat-bonding chemical fiber are composed, and the functional powder is uniformly distributed in the wood pulp fiber and the heat-bonding chemical fiber, the mass ratio of the wood pulp fiber, the heat-bonding chemical fiber and the functional powder is 4.5:2.8:1, and the functional powder comprises the following raw materials in parts by weight: 14 parts of modified chitosan, 4.5 parts of modified polyethylene glycol, 7 parts of modified nano-bentonite, 2.5 parts of paeoniflorin, and 1.8 parts of modified corn protein;

[0062] The method for manufacturing the dry swelling paper comprises the following steps:

[0063] The raw materials are weighed according to the proportion;

[0064] The wood pulp fiber and the heat-bonding chemical fiber are formed into a web by using the air-laid technology;

[0065] The modified chitosan, the modified polyethylene glycol, the modified nano-bentonite and the paeoniflorin are mixed uniformly by using the mechanical oscillation method, and then are scattered on the web of the wood pulp fiber and are sucked into the web by using the air suction method;

[0066] The modified corn protein is scattered on the web of the heat-bonding chemical fiber by using the mechanical oscillation method, and then is sucked into the web by using the air suction method;

[0067] The two webs are heated and bonded to form a shape, and then are cut to obtain the dry swelling paper.

[0068] The modified chitosan is prepared by the following method: 12 parts of chitosan are dissolved in 20 times of water by weight and 6% acetic acid aqueous solution to obtain a solution, the solution is subjected to ultrasonic treatment in an ultrasonic cleaner, is subjected to grading by using a polyvinylidene fluoride ultrafiltration membrane, 8 parts of anhydrous ethanol is added while stirring, then the PH value is adjusted to be neutral, 10 parts of epichlorohydrin is added, and stirring is performed for 50 min to obtain the modified chitosan, the ultrasonic treatment is performed at an ultrasonic frequency of 25 kHz and a power of 240 W for 50 min.

[0069] In the embodiment, the modified polyethylene glycol is prepared by the following method: 10 parts of polyethylene glycol is added into 8 times of water by weight, then 3 parts of polyaspartic acid is added, stirring is performed for 50 min, 0.1 part of nano-activated carbon is added, stirring is performed for 50 min, and then the modified polyethylene glycol is obtained after freeze-drying.

[0070] Preferably, the modified nano-bentonite is prepared by the following method: 20 parts of nano-bentonite is placed in a muffle furnace and is subjected to programmed heating to 600℃, and then is subjected to constant temperature calcination for 2 h, then water vapor is introduced for 50 min, then water with 10 times of the mass of the nano-bentonite and sodium lignosulfonate with 0.3 times of the mass of the bentonite are added to form a suspension slurry, the upper suspension liquid is subjected to centrifugal treatment at 4000 r / min for 10 min in a centrifuge, vacuum filtration is performed, and then the modified nano-bentonite is obtained by spray drying.

[0071] In specific implementation, the preparation method of the modified zein is as follows: Take 8 parts by weight of zein, add it to an ethanol solution with a concentration of 90% and a mass of 8 times that of zein, then add 3 parts of soy protein isolate and 0.3 parts of quercetin, stir at 50°C for 60 min, and then dry at 90°C for 3 h to obtain modified zein.

[0072] Example 5

[0073] This invention provides a dry-process expanded paper, such as... Figure 1 As shown, it is composed of wood pulp fiber and thermally bonded chemical fiber, with functional powder uniformly distributed inside. The mass ratio of wood pulp fiber, thermally bonded chemical fiber and functional powder is 5:3:1. The functional powder includes the following raw materials in parts by weight: 15 parts modified chitosan, 5 parts modified polyethylene glycol, 8 parts modified nano-bentonite, 3 parts paeoniflorin, and 2 parts modified zein.

[0074] The method for producing the dry-process expanded paper includes the following steps:

[0075] Weigh each ingredient according to the proportions;

[0076] Wood pulp fiber and thermally bonded chemical fiber are web-formed using airflow web-forming technology;

[0077] Modified chitosan, modified polyethylene glycol, modified nano-bentonite, and paeoniflorin were mixed evenly using a mechanical vibration method and then sprinkled onto a fiber mesh made of wood pulp fibers. The mixture was then drawn into the fiber mesh using a suction method.

[0078] Modified corn gluten was spread onto a fiber mesh made of thermally bonded chemical fiber using a mechanical vibration method and then sucked into the fiber mesh using a suction method.

[0079] Two layers of fiber web are heated and bonded together, then cut to obtain dry-process expanded paper.

[0080] The modified chitosan is prepared as follows: 12 parts by weight of chitosan are dissolved in 20 times their weight of a 6% acetic acid aqueous solution. The resulting solution is ultrasonically treated in an ultrasonic cleaner, fractionated using a polyvinylidene fluoride ultrafiltration membrane, and 8 parts of anhydrous ethanol are added while stirring. The pH is then adjusted to neutral, and 10 parts of epichlorohydrin are added. The mixture is stirred for 50 minutes to obtain the modified chitosan. The ultrasonic frequency of the ultrasonic treatment is 25 kHz, the power is 240 W, and the treatment time is 50 minutes.

[0081] In this embodiment, the modified polyethylene glycol is prepared as follows: 10 parts by weight of polyethylene glycol are added to 8 times the weight of water, then 3 parts of polyaspartic acid are added and stirred for 50 min, then 0.1 parts of nano-activated carbon are added and stirred for 50 min. After freeze-drying, the modified polyethylene glycol is obtained.

[0082] Preferably, the modified nanometer bentonite is prepared as follows: 20 parts of nanometer bentonite is placed in a muffle furnace and programmed to heat to 600℃, and then heated for 2 hours, and then water vapor is introduced for 50 minutes, and then 10 times the mass of the nanometer bentonite of water and 0.3 times the mass of the nanometer bentonite of sodium lignosulfonate are added to form a suspension slurry, and the upper suspension liquid is centrifuged in a centrifuge at 4000 r / min for 10 minutes, vacuum filtered, and spray dried to obtain the modified nanometer bentonite.

[0083] In a specific implementation, the modified corn protein is prepared as follows: 8 parts of corn protein is added to 8 times the mass of the corn protein of an ethanol solution with a concentration of 90%, and then 3 parts of soybean protein isolate and 0.3 parts of quercetin are added, and stirred at 50℃ for 60 minutes, and then dried at 90℃ for 3 hours to obtain the modified corn protein.

[0084] Comparative Example 1: Different from Example 3, the modified chitosan is replaced by ordinary chitosan.

[0085] Comparative Example 2: Different from Example 3, the modified polyethylene glycol is replaced by ordinary polyethylene glycol.

[0086] Comparative Example 3: Different from Example 3, the modified nanometer bentonite is replaced by ordinary nanometer bentonite.

[0087] Comparative Example 4: The modified chitosan is replaced by ordinary chitosan, the modified polyethylene glycol is replaced by ordinary polyethylene glycol, and the modified nanometer bentonite is replaced by ordinary nanometer bentonite.

[0088] Comparative Example 5: Different from Example 3, the modified corn protein is replaced by ordinary corn protein.

[0089] Comparative Example 6: Different from Example 3, the paeonol is not contained.

[0090] Comparative Example 7: Different from Example 3, the modified chitosan is replaced by ordinary chitosan and the paeonol is not contained.

[0091] Experiment One

[0092] The liquid retention capacity, liquid penetration speed, and anti-back bleeding performance of the dry expanded paper of Examples 1-5 and Comparative Examples 1-4 are tested, and the results are as shown in Table 1 below:

[0093] Group Liquid retention capacity g / g distilled water Liquid permeation rate s 0.9% saline Resistance to back siphonage g Example 1 65 1.7 1.5 Example 2 66 1.6 1.3 Example 3 68 1.5 1.2 Example 4 67 1.5 1.3 Example 5 66 1.6 1.4 Comparative Example 1 47 2.1 2.0 Comparative Example 2 44 2.2 2.1 Comparative Example 3 42 2.5 2.3 Comparative Example 4 35 2.7 2.5

[0094] From the above results, it can be seen that the dry process bulking paper prepared by the present application has good liquid retention capacity, liquid penetration speed and anti-back bleeding performance. The modified chitosan, modified polyethylene glycol and modified nano-bentonite have synergistic effect, which can greatly improve the above performance of the dry process bulking paper. Taking the liquid retention capacity as an example, the comparative example 4 all uses non-modified materials, the comparative example 1, 2 and 3 respectively uses one modified material, the comparative example 3 increases 7 compared with the comparative example 4, the comparative example 2 increases 9 compared with the comparative example 4, the comparative example 1 increases 12 compared with the comparative example 4, 35+7+9+12=63<68 (example 3), so it can be known that the modified chitosan, modified polyethylene glycol and modified nano-bentonite have synergistic effect of 1+1+1>3.

[0095] Experiment two

[0096] According to the bactericidal performance of the dry process bulking paper of the examples 1-5 and the comparative examples 1, 6 and 7 in GB15979 C3 test, the test results are as follows in table 2:

[0097] Group 2 min S. aureus kill rate 2 min C. albicans kill rate Example 1 99.5 99.1 Example 2 99.6 99.3 Example 3 99.9 99.5 Example 4 99.8 99.4 Example 5 99.6 99.3 Comparative Example 1 80.6 74.8 Comparative Example 6 78.8 71.5 Comparative Example 7 65.5 50.6

[0098] From the above results, it can be seen that the dry process bulking paper prepared by the present application has good liquid retention capacity, liquid penetration speed and anti-back bleeding performance. The modified chitosan, modified polyethylene glycol and modified nano-bentonite have synergistic effect, which can greatly improve the above performance of the dry process bulking paper. Taking the liquid retention capacity as an example, the comparative example 4 all uses non-modified materials, the comparative example 1, 2 and 3 respectively uses one modified material, the comparative example 3 increases 7 compared with the comparative example 4, the comparative example 2 increases 9 compared with the comparative example 4, the comparative example 1 increases 12 compared with the comparative example 4, 35+7+9+12=63<68 (example 3), so it can be known that the modified chitosan, modified polyethylene glycol and modified nano-bentonite have synergistic effect of 1+1+1>3.

[0099] It should be noted that, for the foregoing examples, in order to simply describe, they are all expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the order of the described actions, because according to the present application, certain steps can be performed in other order or simultaneously. Secondly, those skilled in the art should also know that the examples described in the specification all belong to preferred examples, and the actions and modules involved are not necessarily required by the present application.

[0100] The above examples are only used to illustrate the technical solutions of the present application, but not to limit the protection scope of the present application. Obviously, the described examples are only some examples of the present application, not all examples. Based on these examples, all other examples obtained by those skilled in the art without creative labor belong to the scope to be protected by the present application. Although the present application has been described in detail with reference to the above examples, those skilled in the art can still combine, add or delete the features in the examples of the present application according to the circumstances without making creative labor, so as to obtain different other technical solutions which do not deviate from the concept of the present application in essence. These technical solutions also belong to the scope to be protected by the present application.

Claims

1. A dry-process expanded paper, characterized in that, It is composed of wood pulp fiber, thermally bonded chemical fiber and functional powder uniformly distributed therein, wherein the mass ratio of wood pulp fiber, thermally bonded chemical fiber and functional powder is 2-5:2-3:1, and the functional powder comprises the following raw materials in parts by weight: 10-15 parts modified chitosan, 2-5 parts modified polyethylene glycol, 4-8 parts modified nano-bentonite, 1-3 parts paeoniflorin, and 1-2 parts modified zein. The modified chitosan is prepared as follows: 8-12 parts by weight of chitosan are dissolved in 10-20 times their weight of 2-6% acetic acid aqueous solution. The resulting solution is ultrasonically treated in an ultrasonic cleaner, classified using a polyvinylidene fluoride ultrafiltration membrane, and 6-8 parts of anhydrous ethanol are added while stirring. The pH is then adjusted to neutral, and 6-10 parts of epichlorohydrin are added. The mixture is stirred for 30-50 minutes to obtain the modified chitosan. The modified polyethylene glycol is prepared as follows: by weight, take 6-10 parts of polyethylene glycol, add 5-8 times the weight of water, then add 2-3 parts of polyaspartic acid, stir for 30-50 min, then add 0.5-1 parts of nano-activated carbon, stir for 30-50 min, and freeze-dry to obtain modified polyethylene glycol. The modified nano-bentonite is prepared as follows: 10-20 parts by weight of nano-bentonite are placed in a muffle furnace and heated to 500-600℃. The mixture is then calcined at a constant temperature for 2 hours. Then, steam is introduced for 30-50 minutes. Next, 6-10 times the weight of water and 0.1-0.3 times the weight of sodium lignosulfonate are added and stirred to form a suspension slurry. The upper suspension is centrifuged at 2000-4000 r / min for 10 minutes, vacuum filtered, and spray-dried to obtain the modified nano-bentonite. The modified zein is prepared as follows: Take 6-8 parts by weight of zein and add it to an ethanol solution with a concentration of 80-90% and a mass of 5-8 times that of zein. Then add 1-3 parts of soy protein isolate and 0.1-0.3 parts of quercetin. Stir at 40-50℃ for 40-60 min and then dry at 80-90℃ for 2-3 h to obtain modified zein. The method for producing the dry-process expanded paper includes the following steps: Weigh each ingredient according to the proportions; Wood pulp fiber and thermally bonded chemical fiber are web-formed using airflow web-forming technology; Modified chitosan, modified polyethylene glycol, modified nano-bentonite, and paeoniflorin were mixed evenly using a mechanical vibration method and then sprinkled onto a fiber mesh made of wood pulp fibers. The mixture was then drawn into the fiber mesh using a suction method. Modified corn gluten was spread onto a fiber mesh made of thermally bonded chemical fiber using a mechanical vibration method and then sucked into the fiber mesh using a suction method. Two layers of fiber web are heated and bonded together, then cut to obtain dry-process expanded paper.

2. The dry-process expanded paper as described in claim 1, characterized in that, The functional powder comprises the following raw materials in parts by weight: 11-14 parts modified chitosan, 2.5-4.5 parts modified polyethylene glycol, 5-7 parts modified nano-bentonite, 1.5-2.5 parts paeoniflorin, and 1.2-1.8 parts modified zein.

3. The dry-process expanded paper as described in claim 2, characterized in that, The functional powder comprises the following raw materials in parts by weight: 12.5 parts modified chitosan, 3.5 parts modified polyethylene glycol, 6 parts modified nano-bentonite, 2 parts paeoniflorin, and 1.5 parts modified zein.

4. The dry-process expanded paper as described in claim 1, characterized in that, The ultrasonic treatment uses an ultrasonic frequency of 20-25kHz, a power of 200-240W, and a processing time of 30-50min.

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