CN114605683A - Preparation method of nanofiber membrane and application of nanofiber membrane in cellulose casing - Google Patents
Preparation method of nanofiber membrane and application of nanofiber membrane in cellulose casing Download PDFInfo
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- CN114605683A CN114605683A CN202210268973.8A CN202210268973A CN114605683A CN 114605683 A CN114605683 A CN 114605683A CN 202210268973 A CN202210268973 A CN 202210268973A CN 114605683 A CN114605683 A CN 114605683A
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- 239000012528 membrane Substances 0.000 title claims abstract description 80
- 229920002678 cellulose Polymers 0.000 title claims abstract description 64
- 239000001913 cellulose Substances 0.000 title claims abstract description 64
- 239000002121 nanofiber Substances 0.000 title claims abstract description 55
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims description 132
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 75
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 75
- 238000004383 yellowing Methods 0.000 claims description 57
- 238000000227 grinding Methods 0.000 claims description 56
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 44
- 238000000498 ball milling Methods 0.000 claims description 38
- 238000002156 mixing Methods 0.000 claims description 37
- 230000032683 aging Effects 0.000 claims description 33
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 claims description 30
- 229920000297 Rayon Polymers 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 30
- 239000002131 composite material Substances 0.000 claims description 29
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 24
- 239000003513 alkali Substances 0.000 claims description 20
- HQKMJHAJHXVSDF-UHFFFAOYSA-L magnesium stearate Chemical compound [Mg+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O HQKMJHAJHXVSDF-UHFFFAOYSA-L 0.000 claims description 20
- 229920001046 Nanocellulose Polymers 0.000 claims description 19
- 239000002702 enteric coating Substances 0.000 claims description 16
- 238000009505 enteric coating Methods 0.000 claims description 16
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 15
- 239000007864 aqueous solution Substances 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 15
- JLPULHDHAOZNQI-ZTIMHPMXSA-N 1-hexadecanoyl-2-(9Z,12Z-octadecadienoyl)-sn-glycero-3-phosphocholine Chemical compound CCCCCCCCCCCCCCCC(=O)OC[C@H](COP([O-])(=O)OCC[N+](C)(C)C)OC(=O)CCCCCCC\C=C/C\C=C/CCCCC JLPULHDHAOZNQI-ZTIMHPMXSA-N 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 12
- 229910021641 deionized water Inorganic materials 0.000 claims description 12
- 239000004408 titanium dioxide Substances 0.000 claims description 12
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 11
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 11
- 229920000742 Cotton Polymers 0.000 claims description 11
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 11
- 239000011425 bamboo Substances 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 11
- LUEWUZLMQUOBSB-FSKGGBMCSA-N (2s,3s,4s,5s,6r)-2-[(2r,3s,4r,5r,6s)-6-[(2r,3s,4r,5s,6s)-4,5-dihydroxy-2-(hydroxymethyl)-6-[(2r,4r,5s,6r)-4,5,6-trihydroxy-2-(hydroxymethyl)oxan-3-yl]oxyoxan-3-yl]oxy-4,5-dihydroxy-2-(hydroxymethyl)oxan-3-yl]oxy-6-(hydroxymethyl)oxane-3,4,5-triol Chemical compound O[C@H]1[C@@H](O)[C@H](O)[C@@H](CO)O[C@H]1O[C@@H]1[C@@H](CO)O[C@@H](O[C@@H]2[C@H](O[C@@H](OC3[C@H](O[C@@H](O)[C@@H](O)[C@H]3O)CO)[C@@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O LUEWUZLMQUOBSB-FSKGGBMCSA-N 0.000 claims description 10
- MTEZSDOQASFMDI-UHFFFAOYSA-N 1-trimethoxysilylpropan-1-ol Chemical compound CCC(O)[Si](OC)(OC)OC MTEZSDOQASFMDI-UHFFFAOYSA-N 0.000 claims description 10
- 244000247812 Amorphophallus rivieri Species 0.000 claims description 10
- 235000001206 Amorphophallus rivieri Nutrition 0.000 claims description 10
- 229920002581 Glucomannan Polymers 0.000 claims description 10
- 229920002752 Konjac Polymers 0.000 claims description 10
- 239000004115 Sodium Silicate Substances 0.000 claims description 10
- 229920002472 Starch Polymers 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- ZOOODBUHSVUZEM-UHFFFAOYSA-N ethoxymethanedithioic acid Chemical compound CCOC(S)=S ZOOODBUHSVUZEM-UHFFFAOYSA-N 0.000 claims description 10
- 229940046240 glucomannan Drugs 0.000 claims description 10
- 239000000252 konjac Substances 0.000 claims description 10
- 235000010485 konjac Nutrition 0.000 claims description 10
- 235000019359 magnesium stearate Nutrition 0.000 claims description 10
- 239000011734 sodium Substances 0.000 claims description 10
- 229910052708 sodium Inorganic materials 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 10
- 239000008107 starch Substances 0.000 claims description 10
- 235000019698 starch Nutrition 0.000 claims description 10
- PUVAFTRIIUSGLK-UHFFFAOYSA-M trimethyl(oxiran-2-ylmethyl)azanium;chloride Chemical compound [Cl-].C[N+](C)(C)CC1CO1 PUVAFTRIIUSGLK-UHFFFAOYSA-M 0.000 claims description 10
- 238000005406 washing Methods 0.000 claims description 10
- 239000012991 xanthate Substances 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 9
- 229940083466 soybean lecithin Drugs 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 241000234295 Musa Species 0.000 claims description 7
- 235000018290 Musa x paradisiaca Nutrition 0.000 claims description 7
- 230000003113 alkalizing effect Effects 0.000 claims description 5
- 230000001112 coagulating effect Effects 0.000 claims description 5
- 230000003009 desulfurizing effect Effects 0.000 claims description 5
- 238000007598 dipping method Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000011265 semifinished product Substances 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 240000000569 Musa basjoo Species 0.000 claims description 3
- 235000000139 Musa basjoo Nutrition 0.000 claims description 3
- 239000008347 soybean phospholipid Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 244000082204 Phyllostachys viridis Species 0.000 claims 2
- 235000013372 meat Nutrition 0.000 abstract description 8
- 230000037303 wrinkles Effects 0.000 abstract description 8
- 150000004676 glycans Chemical class 0.000 abstract description 5
- 229920001282 polysaccharide Polymers 0.000 abstract description 5
- 239000005017 polysaccharide Substances 0.000 abstract description 5
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 44
- 239000000919 ceramic Substances 0.000 description 22
- 235000013580 sausages Nutrition 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 15
- 241001330002 Bambuseae Species 0.000 description 9
- 239000007921 spray Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 3
- 230000002431 foraging effect Effects 0.000 description 3
- 238000004806 packaging method and process Methods 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- 230000000391 smoking effect Effects 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 210000002429 large intestine Anatomy 0.000 description 2
- 244000144972 livestock Species 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 210000000813 small intestine Anatomy 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010411 cooking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22C—PROCESSING MEAT, POULTRY, OR FISH
- A22C13/00—Sausage casings
- A22C13/0013—Chemical composition of synthetic sausage casings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22C—PROCESSING MEAT, POULTRY, OR FISH
- A22C13/00—Sausage casings
- A22C2013/0083—Sausage casings biaxially oriented
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22C—PROCESSING MEAT, POULTRY, OR FISH
- A22C13/00—Sausage casings
- A22C2013/0089—Sausage casings smokable casings, e.g. permeable to liquid smoke or phenol
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22C—PROCESSING MEAT, POULTRY, OR FISH
- A22C13/00—Sausage casings
- A22C2013/0096—Sausage casings cellulosic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2301/08—Cellulose derivatives
- C08J2301/22—Cellulose xanthate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/05—Alcohols; Metal alcoholates
- C08K5/053—Polyhydroxylic alcohols
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5435—Silicon-containing compounds containing oxygen containing oxygen in a ring
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
- C08K7/26—Silicon- containing compounds
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Food Science & Technology (AREA)
- Cosmetics (AREA)
Abstract
The invention discloses a preparation method of a nanofiber membrane and application of the nanofiber membrane in cellulose casings, and belongs to the field of polysaccharides and derivatives thereof. The nanofiber membrane disclosed by the invention is used as a casing, has good contractility, can shrink along with meat stuffing after being smoked and roasted, does not generate wrinkles, and has the maximum shrinkage rate of 7.4-7.6%; the nanofiber membrane of the invention is used as a casing, can not burst in a frozen anhydrous state, has the longitudinal tensile strength of 6.49-6.53kN/m and the transverse tensile strength of 5.19-5.23kN/m under the state of-20 ℃ and the water content of 0.5%.
Description
Technical Field
The invention relates to a preparation method of a nanofiber membrane and application of the nanofiber membrane in cellulose casings, and belongs to the field of polysaccharides and derivatives thereof.
Background
The casing is used as a coat for filling sausages and sausages, mainly comprises a livestock large intestine and small intestine casing, a plastic casing, a cellulose casing and the like, the livestock large intestine and small intestine casing has excellent properties such as elasticity and water permeability as a natural casing, but has irregular shape and specification and limited quantity and is not suitable for industrial production of sausage products, and the plastic casing is the most various casings on the market at present, can isolate air, has impact resistance, is suitable for cooking commodities, cannot be used for smoking and baking, and may have certain toxicity.
The fiber membrane is made of natural plant polysaccharide, has the air permeability of natural sausage casing as cellulose sausage casing, has certain stretching property, can be used for smoking and baking under a wet state, can bring flavor to sausage products, is low in cost because the raw materials are derived from the polysaccharide of the plant, and is environment-friendly, non-toxic and harmless to human bodies.
CN112956518A discloses a preparation method of a bio-based cellulose casing capable of being smoked quickly, which can make the prepared cellulose casing have better quick smoking effect, but the sausage moisture after the sausage is smoked is reduced, the casing shrinkage is poor, the casing cannot shrink with meat stuffing, wrinkles are generated, the appearance is affected, and the casing can burst when the casing is stored in a frozen state.
The method for preparing the cellulose membrane by adopting viscose is a mainstream preparation process, and CN102850459A discloses a method for producing a cellulose membrane by adopting cotton, wood and bamboo composite pulp, which belongs to the field of polysaccharide and derivatives thereof.
In summary, the prior art has the following problems:
(1) the existing fiber membrane has poor contractibility and cannot be contracted along with meat stuffing, so that wrinkles are generated;
(2) the existing fiber membrane has low tensile strength under a low-temperature storage environment and is easy to cause burst.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art, and realizes the following purposes by modifying raw materials to prepare viscose and preparing a nanofiber membrane:
(1) the fiber film has good contractibility, can be contracted along with the meat stuffing, and is not easy to generate wrinkles;
(2) the fiber membrane has high tensile strength under the low-temperature storage environment, and does not cause burst.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of a nanofiber membrane comprises the steps of pulp alkalization pressing, crushing and aging, yellowing, viscose preparation and membrane preparation;
the following is a further improvement of the above technical solution:
alkalizing and squeezing the pulp, putting the mixed pulp into alkali liquor, stirring for 40-50min at 60-70 ℃ to obtain alkalized pulp, and squeezing to remove redundant alkali liquor to obtain squeezed material;
the mixed pulp comprises the following components in parts by mass: 2.5-3.5 parts of cotton pulp, 0.8-1.2 parts of bamboo pulp and 0.8-1.2 parts of banana stalk pulp;
the solid contents of cotton pulp, bamboo pulp and Japanese banana stalk pulp in the mixed pulp are 35-45%;
the alkali liquor is a sodium hydroxide solution with the mass concentration of 15-20%;
the mass ratio of the mixed pulp to the alkali liquor is 1: 4-6.
The crushing and aging comprises one-step ball milling crushing, two-step ball milling crushing and aging;
performing one-step ball milling and crushing, mixing the pressed material with the modified nano-cellulose, and putting the mixture into a ball mill for ball milling for 80-120min to obtain a one-step ball grinding material;
the ball grinding balls are zirconia ceramic balls with the diameters of 5mm and 3mm, and the mass ratio of the zirconia ceramic balls is 1: 1.5-2.5;
the mass ratio of the pressed material to the modified nano-cellulose is 8-12:1: 15-25;
mixing the nano-cellulose with a sodium hydroxide aqueous solution with the mass concentration of 15-25%, adding ethylene glycol and konjac glucomannan, stirring at 50-70 ℃ for 25-40min, adding 2, 3-epoxypropyltrimethylammonium chloride, stirring at 50-70 ℃ for 150-200min, adding sodium carboxymethyl starch, stirring at 40-50 ℃ for 80-120min, washing with ethylene glycol to neutrality, washing with water, filtering and drying until the water content is 10-15% to obtain the modified nano-cellulose;
the mass ratio of the nano-cellulose to the sodium hydroxide aqueous solution is 4-6: 1;
the mass ratio of the ethylene glycol to the nano-cellulose is 2.5-3.5: 2;
the mass ratio of the konjac glucomannan to the nano cellulose is 1: 4-6;
the mass ratio of the 2, 3-epoxypropyltrimethylammonium chloride to the nanocellulose is 1: 3-5;
the mass ratio of the sodium carboxymethyl starch to the nano-cellulose is 1: 3-5.
The two-step ball milling, crushing and aging are carried out, the one-step ball milling material is put into a ball mill for ball milling for 100-;
the ball grinding balls are zirconia ceramic balls with the diameters of 3mm and 1mm, and the mass ratio of the zirconia ceramic balls is 1: 2-4;
the mass ratio of the one-step ball grinding material to the ball grinding ball is 1-3: 5.
The yellowing step comprises the steps of mixing the aging material with 8-15% of sodium hydroxide aqueous solution, stirring for 15-30min at 40-50 ℃, cleaning, filtering, introducing carbon disulfide gas, and reacting for 60-90min at 20-30 ℃ to obtain a yellowing material;
the mass ratio of the aging material to the sodium hydroxide solution is 1: 4-6;
the mass ratio of the carbon disulfide gas to the aging material is 1: 7-9.
The preparation of the viscose comprises the steps of preparing and mixing the xanthate material composite diatomite;
preparing composite diatomite of the yellowing material, wherein 5-10wt% of the yellowing material is used as the yellowing material to be modified, and the rest is the rest;
mixing a yellowing material to be modified, diatomite and ethylene glycol to obtain a mixture, heating the mixture to 90-110 ℃ under 0.20-0.25Mpa, keeping the temperature for 18-22h, mixing the mixture with sodium silicate, magnesium stearate, gamma-glycidyl ether oxypropyltrimethoxysilane and water to obtain a grinding material, grinding the grinding material to the particle size of 0.70-0.80 mu m, stirring for 25-40min at 60-80 ℃, filtering and cleaning to obtain yellowing material composite diatomite;
the mixture comprises the following components in parts by mass: 3-5 parts of modified yellowing material, 6-10 parts of diatomite and 2.5-3.5 parts of ethylene glycol;
the particle size of the diatomite is 1.5-2.5 mu m;
the grinding material comprises the following components in parts by mass: 400 portions of mixture, 0.8 to 1.2 portions of sodium silicate, 0.8 to 1.2 portions of magnesium stearate, 8 to 12 portions of gamma-glycidyl ether oxypropyl trimethoxy silane and 3500 portions of water 2500;
mixing, namely uniformly mixing the rest yellowing material, the yellowing material composite diatomite, the titanium dioxide, the soybean lecithin and the deionized water to obtain the cellulose membrane viscose;
the cellulose membrane viscose comprises the following components in parts by mass: 800 portions of the rest of yellow chemical material, 250 portions of the yellow chemical material composite diatomite, 1.5 to 2.5 portions of titanium dioxide, 8 to 12 portions of soybean phospholipid and 12000 portions of deionized water.
The method comprises the following steps of preparing a film, namely spraying the obtained viscose into a coagulating bath by using a film forming device to obtain a semi-finished product of the natural cellulose film, then desulfurizing, dipping glycerol, and drying until the water content is 8-10% to obtain a nano cellulose film;
the specification of the spray gap of the spray head is 170-;
the nano cellulose membrane has a quantitative of 123-132g/m2。
The prepared nanofiber membrane can be applied to cellulose casings.
Compared with the prior art, the invention has the following beneficial effects:
the nanofiber membrane disclosed by the invention is used as a casing, has good contractility, can shrink along with meat stuffing after being smoked and roasted, does not generate wrinkles, and has the maximum shrinkage rate of 7.4-7.6%;
the nanofiber membrane of the invention is used as a casing, can not burst in a frozen anhydrous state, has the longitudinal tensile strength of 6.49-6.53kN/m and the transverse tensile strength of 5.19-5.23kN/m (GB/T453-2002) under the state of-20 ℃ and the water content of 0.5 percent;
the nanofiber membrane of the invention is used as a casing, has good toughness, and has the longitudinal elongation of 20-21% and the transverse elongation of 41-43% (GB/T453-2002);
the nanofiber membrane provided by the invention is used as a sausage casing, has good anti-adhesion property, is easy to peel, is not easy to adhere with sausage contents, and has the anti-adhesion property of 86-87% (GB/T22871-2008).
Detailed Description
Example 1
(1) Pulp alkalizing and squeezing
Adding the mixed pulp into alkali liquor, stirring at 65 ℃ for 45min to obtain alkalized slurry, and squeezing by a conventional method to remove excessive alkali liquor to obtain squeezed material;
the mixed pulp comprises the following components in parts by mass: 3 parts of cotton pulp, 1 part of bamboo pulp and 1 part of banana stalk pulp;
the solid contents of the cotton pulp, the bamboo pulp and the banana stalk pulp in the mixed pulp are all 40 percent;
the alkali liquor is a sodium hydroxide solution with the mass concentration of 18%;
the mass ratio of the mixed pulp to the alkali liquor is 1: 5.
(2) Pulverizing and aging
a. One-step ball milling and crushing
Mixing the squeezed material and the modified nano-cellulose, putting the mixture into a ball mill for one-step ball milling, and adding ball milling balls for grinding for 90min to obtain a one-step ball grinding material;
the ball grinding balls are zirconia ceramic balls with the diameters of 5mm and 3mm, and the mass ratio of the zirconia ceramic balls to the zirconia ceramic balls is 1: 2;
the mass ratio of the pressed material to the modified nano-cellulose to the ball-milling balls is 10:1: 20;
mixing nano-cellulose with a sodium hydroxide aqueous solution with the mass concentration of 20%, adding ethylene glycol and konjac glucomannan, stirring at 60 ℃ for 30min, then adding 2, 3-epoxypropyltrimethylammonium chloride, stirring at 60 ℃ for 180min, then adding sodium carboxymethyl starch, stirring at 45 ℃ for 90min, then washing with ethylene glycol to neutrality, washing with water, filtering and drying until the water content is 12% to obtain the modified nano-cellulose;
the mass ratio of the nano-cellulose to the sodium hydroxide aqueous solution is 5: 1;
the mass ratio of the ethylene glycol to the nano-cellulose is 3: 2;
the mass ratio of the konjac glucomannan to the nano cellulose is 1: 5;
the mass ratio of the 2, 3-epoxypropyltrimethylammonium chloride to the nanocellulose is 1: 4;
the mass ratio of the sodium carboxymethyl starch to the nano-cellulose is 1: 4.
b. Two-step ball milling, crushing and aging
Putting the first-step ball milling material into a ball mill for second-step ball milling, adding ball milling balls for grinding for 120min to obtain a second-step ball grinding material, and placing the second-step ball grinding material at 65 ℃ for 180min for aging to obtain an aging material;
the ball grinding balls are zirconia ceramic balls with the diameters of 3mm and 1mm, and the mass ratio of the zirconia ceramic balls to the zirconia ceramic balls is 1: 3;
the mass ratio of the one-step ball grinding material to the ball grinding ball is 2: 5.
(3) Yellowing of
Mixing the aging material with 10% sodium hydroxide aqueous solution, stirring at 45 deg.C for 20min, cleaning, filtering, introducing carbon disulfide gas, and reacting at 25 deg.C for 70min to obtain yellowing material;
the mass ratio of the aging material to the sodium hydroxide solution is 1: 5;
the mass ratio of the carbon disulfide gas to the aging material is 1: 8.
(4) Preparation of viscose
a. Preparation of composite diatomite
Taking 5wt% of the yellowing material as the yellowing material to be modified, and the rest is the residual yellowing material;
the preparation method of the yellowing material composite diatomite comprises the steps of mixing a yellowing material to be modified, diatomite and ethylene glycol to obtain a mixture, heating the mixture to 100 ℃ under 0.23Mpa, keeping the temperature for 20 hours, mixing the mixture with sodium silicate, magnesium stearate, gamma-glycidyl ether oxypropyltrimethoxysilane and water to obtain a grinding material, putting the grinding material into a ball mill, grinding until the particle size is 0.75 mu m, stirring for 30min at 70 ℃ after grinding, filtering and cleaning to obtain the yellowing material composite diatomite;
the mixture comprises the following components in parts by mass: 4 parts of a yellowing material to be modified, 8 parts of diatomite and 3 parts of ethylene glycol;
the particle size of the diatomite is 2 μm;
the grinding material comprises the following components in parts by mass: 500 parts of mixture, 1 part of sodium silicate, 1 part of magnesium stearate, 10 parts of gamma-glycidyl ether oxypropyl trimethoxy silane and 3000 parts of water;
b. mixing
Uniformly mixing the rest of the xanthate material, the xanthate material composite diatomite, the titanium dioxide, the soybean lecithin and the deionized water to obtain the cellulose membrane viscose;
the cellulose membrane viscose comprises the following components in parts by mass: 1000 parts of the rest yellowing material, 200 parts of the yellowing material composite diatomite, 2 parts of titanium dioxide, 10 parts of soybean lecithin and 10000 parts of deionized water.
(5) Film production
Spraying the obtained viscose into a coagulating bath by using a film forming device to obtain a natural cellulose film semi-finished product, then desulfurizing, dipping glycerol, and drying until the water content is 9% to obtain a nano cellulose film;
the specification of the spray seam of the spray head is 180 mu m;
the nano cellulose membrane has a quantitative content of 127g/m2Can be used as sausage casing for packaging sausage.
The nanofiber membrane in the example 1 is used as a casing, has good contractility, can shrink with meat stuffing after being smoked and roasted, does not generate wrinkles, and has the maximum shrinkage rate of 7.6%;
the nanofiber membrane of example 1 was used as a casing, and did not burst in a frozen anhydrous state at-20 ℃ with a moisture content of 0.5%, a longitudinal tensile strength of 6.53kN/m and a transverse tensile strength of 5.23kN/m (GB/T453-2002);
the nanofiber membrane of example 1 was used as an enteric coating and had good toughness with a machine direction elongation of 21% and a transverse direction elongation of 43% (GB/T453-2002);
the nanofiber membrane of example 1 as a sausage casing had good adhesion resistance, was easy to peel, was not easily adhered to sausage contents, and had an adhesion resistance of 87% (GB/T22871-2008).
Example 2
(1) Pulp alkalizing and squeezing
Adding the mixed pulp into alkali liquor, stirring at 60 deg.C for 50min to obtain alkalized slurry, and squeezing by conventional method to remove excessive alkali liquor to obtain squeezed material;
the mixed pulp comprises the following components in parts by mass: 2.5 parts of cotton pulp, 0.8 part of bamboo pulp and 0.8 part of Japanese banana stalk pulp;
the solid contents of cotton pulp, bamboo pulp and banana stalk pulp in the mixed pulp are all 35 percent;
the alkali liquor is a sodium hydroxide solution with the mass concentration of 15%;
the mass ratio of the mixed pulp to the alkali liquor is 1: 6.
(2) Pulverizing and aging
a. Ball milling and crushing in one step
Mixing the pressed material and the modified nano-cellulose, putting the mixture into a ball mill for one-step ball milling, and adding ball milling balls for grinding for 80min to obtain a one-step ball grinding material;
the ball grinding balls are zirconia ceramic balls with the diameters of 5mm and 3mm, and the mass ratio of the zirconia ceramic balls to the zirconia ceramic balls is 1: 1.5;
the mass ratio of the pressed material to the modified nano-cellulose to the ball-milling balls is 8:1: 15;
mixing nano-cellulose with a sodium hydroxide aqueous solution with the mass concentration of 15%, adding ethylene glycol and konjac glucomannan, stirring at 50 ℃ for 40min, adding 2, 3-epoxypropyltrimethylammonium chloride, stirring at 50 ℃ for 200min, adding sodium carboxymethyl starch, stirring at 40 ℃ for 120min, washing with ethylene glycol to neutrality, washing with water, filtering and drying until the water content is 10% to obtain the modified nano-cellulose;
the mass ratio of the nano-cellulose to the sodium hydroxide aqueous solution is 4: 1;
the mass ratio of the ethylene glycol to the nano-cellulose is 2.5: 2;
the mass ratio of the konjac glucomannan to the nano cellulose is 1: 4;
the mass ratio of the 2, 3-epoxypropyltrimethylammonium chloride to the nanocellulose is 1: 3;
the mass ratio of the sodium carboxymethyl starch to the nano-cellulose is 1: 3.
b. Two-step ball milling, crushing and aging
Putting the first-step ball milling material into a ball mill for second-step ball milling, adding ball milling balls for grinding for 100min to obtain a second-step ball grinding material, and placing the second-step ball grinding material at 60 ℃ for 200min for aging to obtain an aging material;
the ball grinding balls are zirconia ceramic balls with the diameters of 3mm and 1mm, and the mass ratio of the zirconia ceramic balls to the zirconia ceramic balls is 1: 2;
the mass ratio of the one-step ball grinding material to the ball grinding ball is 1: 5.
(3) Yellowing of
Mixing the aging material with a sodium hydroxide aqueous solution with the mass concentration of 8%, stirring for 30min at 40 ℃, cleaning, filtering, introducing carbon disulfide gas, and reacting for 90min at 20 ℃ to obtain a yellowing material;
the mass ratio of the aging material to the sodium hydroxide solution is 1: 6;
the mass ratio of the carbon disulfide gas to the aging material is 1: 7.
(4) Preparation of viscose
a. Preparation of composite diatomite
Taking 7wt% of the yellowing material as the yellowing material to be modified, and taking the rest as the residual yellowing material;
the preparation method of the yellowing material composite diatomite comprises the steps of mixing a yellowing material to be modified, diatomite and ethylene glycol to obtain a mixture, heating the mixture to 90 ℃ under 0.20Mpa, keeping the temperature for 22 hours, mixing the mixture with sodium silicate, magnesium stearate, gamma-glycidyl ether oxypropyltrimethoxysilane and water to obtain a grinding material, putting the grinding material into a ball mill, grinding until the particle size is 0.70 mu m, stirring for 40min at 60 ℃, filtering and cleaning to obtain the yellowing material composite diatomite;
the mixture comprises the following components in parts by mass: 3 parts of modified yellowing material, 6 parts of diatomite and 2.5 parts of ethylene glycol;
the particle size of the diatomite is 1.5 mu m;
the grinding material comprises the following components in parts by mass: 400 parts of mixture, 0.8 part of sodium silicate, 0.8 part of magnesium stearate, 8 parts of gamma-glycidyl ether oxypropyl trimethoxy silane and 2500 parts of water;
b. mixing
Uniformly mixing the rest of the xanthate material, the xanthate material composite diatomite, the titanium dioxide, the soybean lecithin and the deionized water to obtain the cellulose membrane viscose;
the cellulose membrane viscose comprises the following components in parts by mass: 800 parts of the rest yellowing material, 150 parts of the yellowing material composite diatomite, 1.5 parts of titanium dioxide, 8 parts of soybean lecithin and 8000 parts of deionized water.
(5) Film production
Spraying the obtained viscose into a coagulating bath by using a film forming device to obtain a natural cellulose film semi-finished product, then desulfurizing, dipping glycerol, and drying until the water content is 8% to obtain a nano cellulose film;
the specification of the spray gap of the spray head is 170 mu m;
the nano cellulose membrane has a quantitative value of 123g/m2Can be used as sausage casing for packaging sausage.
The nanofiber membrane in the embodiment 2 is used as a casing, has good contractility, can shrink along with meat stuffing after being smoked and roasted, does not generate wrinkles, and has the maximum shrinkage rate of 7.5%;
the nanofiber membrane of example 2 was used as a casing, and did not burst in a frozen anhydrous state at-20 ℃ with a moisture content of 0.5%, a longitudinal tensile strength of 6.51kN/m and a transverse tensile strength of 5.19 kN/m (GB/T453-2002);
the nanofiber membrane of example 2, as an enteric coating, had good toughness with a 20% elongation in the machine direction and a 42% elongation in the transverse direction (GB/T453-2002);
the nanofiber membrane of example 2, as a sausage casing, had good adhesion resistance, was easy to peel, was not prone to stick to sausage contents, and had an adhesion resistance of 86% (GB/T22871-2008).
Example 3
(1) Pulp alkalizing and squeezing
Adding the mixed pulp into alkali liquor, stirring at 70 deg.C for 40min to obtain alkalized slurry, and squeezing by conventional method to remove excessive alkali liquor to obtain squeezed material;
the mixed pulp comprises the following components in parts by mass: 3.5 parts of cotton pulp, 1.2 parts of bamboo pulp and 1.2 parts of banana stalk pulp;
the solid contents of cotton pulp, bamboo pulp and banana stalk pulp in the mixed pulp are all 45 percent;
the alkali liquor is a sodium hydroxide solution with the mass concentration of 20%;
the mass ratio of the mixed pulp to the alkali liquor is 1: 4.
(2) Pulverizing and aging
a. Ball milling and crushing in one step
Mixing the pressed material and the modified nano-cellulose, putting the mixture into a ball mill for one-step ball milling, and adding ball milling balls for grinding for 120min to obtain a one-step ball grinding material;
the ball grinding balls are zirconia ceramic balls with the diameters of 5mm and 3mm, and the mass ratio of the zirconia ceramic balls to the zirconia ceramic balls is 1: 2.5;
the mass ratio of the pressed material to the modified nano-cellulose to the ball grinding ball is 12:1: 25;
mixing nano-cellulose with a sodium hydroxide aqueous solution with the mass concentration of 25%, adding ethylene glycol and konjac glucomannan, stirring at 70 ℃ for 25min, then adding 2, 3-epoxypropyltrimethylammonium chloride, stirring at 70 ℃ for 150min, then adding sodium carboxymethyl starch, stirring at 50 ℃ for 80min, then washing with ethylene glycol to neutrality, washing with water, filtering and drying until the water content is 15% to obtain the modified nano-cellulose;
the mass ratio of the nano-cellulose to the sodium hydroxide aqueous solution is 6: 1;
the mass ratio of the ethylene glycol to the nano-cellulose is 3.5: 2;
the mass ratio of the konjac glucomannan to the nano cellulose is 1: 6;
the mass ratio of the 2, 3-epoxypropyl trimethyl ammonium chloride to the nano cellulose is 1: 5;
the mass ratio of the sodium carboxymethyl starch to the nano-cellulose is 1: 5.
b. Two-step ball milling, crushing and aging
Putting the first-step ball milling material into a ball mill for second-step ball milling, adding ball milling balls for grinding for 150min to obtain a second-step ball grinding material, and placing the second-step ball grinding material at 70 ℃ for 150min for aging to obtain an aging material;
the ball grinding balls are zirconia ceramic balls with the diameters of 3mm and 1mm, and the mass ratio of the zirconia ceramic balls to the zirconia ceramic balls is 1: 4;
the mass ratio of the one-step ball grinding material to the ball grinding ball is 3: 5.
(3) Etiolated
Mixing the aging material with a sodium hydroxide aqueous solution with the mass concentration of 15%, stirring for 15min at 50 ℃, cleaning, filtering, introducing carbon disulfide gas, and reacting for 60min at 30 ℃ to obtain a yellowing material;
the mass ratio of the aging material to the sodium hydroxide solution is 1: 4;
the mass ratio of the carbon disulfide gas to the aging material is 1: 9.
(4) Preparation of viscose
a. Preparation of composite diatomite
Taking 10wt% of the yellowing material as the yellowing material to be modified, and taking the rest as the residual yellowing material;
the preparation method of the yellowing material composite diatomite comprises the steps of mixing a yellowing material to be modified, diatomite and ethylene glycol to obtain a mixture, heating the mixture to 110 ℃ under 0.25Mpa, keeping the temperature for 18 hours, mixing the mixture with sodium silicate, magnesium stearate, gamma-glycidyl ether oxypropyltrimethoxysilane and water to obtain a grinding material, putting the grinding material into a ball mill, grinding until the particle size is 0.80 mu m, stirring for 25min at 80 ℃ after grinding, filtering and cleaning to obtain the yellowing material composite diatomite;
the mixture comprises the following components in parts by mass: 5 parts of a yellowing material to be modified, 10 parts of diatomite and 3.5 parts of ethylene glycol;
the particle size of the diatomite is 2.5 mu m;
the grinding material comprises the following components in parts by mass: 600 parts of mixture, 1.2 parts of sodium silicate, 1.2 parts of magnesium stearate, 12 parts of gamma-glycidyl ether oxypropyl trimethoxy silane and 3500 parts of water;
b. mixing
Uniformly mixing the rest of the xanthate material, the xanthate material composite diatomite, the titanium dioxide, the soybean lecithin and the deionized water to obtain the cellulose membrane viscose;
the cellulose membrane viscose comprises the following components in parts by mass: 1200 parts of the rest yellowing material, 250 parts of the yellowing material composite diatomite, 2.5 parts of titanium dioxide, 12 parts of soybean lecithin and 12000 parts of deionized water.
(5) Film production
Spraying the obtained viscose glue into a coagulating bath by using film forming equipment to obtain a semi-finished product of the natural cellulose film, then desulfurizing, dipping glycerol, and drying until the water content is 10% to obtain a nano cellulose film;
the specification of the spray gap of the spray head is 190 mu m;
the nano cellulose membrane has a quantitative rate of 132g/m2Can be used as sausage casing for packaging sausage.
The nanofiber membrane in the embodiment 3 is used as a casing, has good contractility, can shrink along with meat stuffing after being smoked and roasted, does not generate wrinkles, and has the maximum shrinkage rate of 7.4%;
the nanofiber membrane of example 3 was used as a casing, and did not burst in a frozen anhydrous state at-20 ℃ with a moisture content of 0.5%, a longitudinal tensile strength of 6.49kN/m and a transverse tensile strength of 5.22 kN/m (GB/T453-2002);
the nanofiber membrane of example 3, as an enteric coating, had good toughness with a machine direction elongation of 21% and a transverse direction elongation of 41% (GB/T453-2002);
the nanofiber membrane of example 3, as a sausage casing, had good adhesion resistance, was easily peeled, was not easily adhered to sausage contents, and had an adhesion resistance of 87% (GB/T22871-2008).
Comparative example 1
On the basis of the embodiment 1, in the crushing and aging steps, the step of preparing modified nano-cellulose in one-step ball milling and crushing is omitted, the pressed material is mixed with unmodified nano-cellulose, the rest steps are the same, a nano-fiber membrane is prepared, and the performance of the nano-fiber membrane is tested;
the nanofiber membrane of comparative example 1 was used as an enteric coating, with a maximum shrinkage of 4.5%;
the nanofiber membrane of comparative example 1 was used as an enteric coating, and the tensile strength in the machine direction was 4.27kN/m and the tensile strength in the transverse direction was 3.89 kN/m (GB/T453-2002) at-20 ℃ and a water content of 0.5%;
the nanofiber membrane of comparative example 1 was used as an enteric coating with 13% elongation in the machine direction and 27% elongation in the transverse direction (GB/T453-2002);
the nanofiber membrane of comparative example 1 showed 79% blocking resistance as an enteric coating (GB/T22871-2008).
Comparative example 2
On the basis of the example 1, in the step of preparing the viscose, the step of preparing the xanthate composite diatomite is omitted, the viscose is prepared by using unmodified diatomite to replace the xanthate composite diatomite, and the other steps are the same, so that a nanofiber membrane is prepared and the performance of the nanofiber membrane is tested;
the viscose comprises the following components in parts by mass: 1100 parts of yellowing material, 100 parts of diatomite, 2 parts of titanium dioxide, 10 parts of soybean lecithin and 10000 parts of deionized water;
the nanofiber membrane of comparative example 2 was used as an enteric coating, with a maximum shrinkage of 5.8%;
the nanofiber membrane of comparative example 2 was used as an enteric coating, and the tensile strength in the machine direction was 5.35kN/m and the tensile strength in the transverse direction was 4.57 kN/m (GB/T453-2002) at-20 ℃ and a water content of 0.5%;
the nanofiber membrane of comparative example 2 was used as an enteric coating, with a machine direction elongation of 15% and a transverse direction elongation of 32% (GB/T453-2002);
the nanofiber membrane of comparative example 2 had 82% blocking resistance as an enteric coating (GB/T22871-2008).
Comparative example 3
On the basis of the example 1, in the step of preparing the viscose, the steps of adding titanium dioxide and soybean phospholipid and preparing the viscose are omitted, and the other steps are the same, so that a nanofiber membrane is prepared and the performance of the nanofiber membrane is tested;
the viscose comprises the following components in parts by mass: 1000 parts of a yellowing material, 200 parts of a yellowing material composite diatomite and 10000 parts of deionized water;
the nanofiber membrane of comparative example 3 was used as an enteric coating, with a maximum shrinkage of 6.7%;
the nanofiber membrane of comparative example 3 was used as an enteric coating, and the tensile strength in the machine direction was 4.79kN/m and the tensile strength in the transverse direction was 4.19 kN/m (GB/T453-2002) at-20 ℃ and a water content of 0.5%;
the nanofiber membrane of comparative example 3 was used as an enteric coating, with a machine direction elongation of 17% and a transverse direction elongation of 33% (GB/T453-2002);
the nanofiber membrane of comparative example 3 had an anti-stick property of 66% as an enteric coating (GB/T22871-2008).
Claims (8)
1. The preparation method of the nanofiber membrane is characterized by comprising the steps of pulp alkalization pressing, crushing, aging, yellowing, viscose preparation and membrane preparation;
the preparation of the viscose comprises the steps of preparing and mixing the xanthate material composite diatomite;
preparing composite diatomite of the yellowing material, wherein 5-10wt% of the yellowing material is used as the yellowing material to be modified, and the rest is the rest;
mixing a yellowing material to be modified, diatomite and ethylene glycol to obtain a mixture, heating the mixture to 90-110 ℃ under 0.20-0.25Mpa, keeping the temperature for 18-22h, mixing the mixture with sodium silicate, magnesium stearate, gamma-glycidyl ether oxypropyltrimethoxysilane and water to obtain a grinding material, grinding the grinding material to the particle size of 0.70-0.80 mu m, stirring for 25-40min at 60-80 ℃, filtering and cleaning to obtain yellowing material composite diatomite;
and mixing, namely uniformly mixing the rest yellowing material, the yellowing material composite diatomite, the titanium dioxide, the soybean lecithin and the deionized water to obtain the cellulose membrane viscose.
2. The method for preparing a nanofiber membrane as claimed in claim 1, wherein:
the mixture comprises the following components in parts by mass: 3-5 parts of modified yellowing material, 6-10 parts of diatomite and 2.5-3.5 parts of ethylene glycol;
the grinding material comprises the following components in parts by mass: 400 portions of mixture, 0.8 to 1.2 portions of sodium silicate, 0.8 to 1.2 portions of magnesium stearate, 8 to 12 portions of gamma-glycidyl ether oxypropyl trimethoxy silane and 3500 portions of water 2500;
the cellulose membrane viscose comprises the following components in parts by mass: 800 portions of the rest of yellow chemical material, 250 portions of the yellow chemical material composite diatomite, 1.5 to 2.5 portions of titanium dioxide, 8 to 12 portions of soybean phospholipid and 12000 portions of deionized water.
3. The method for preparing a nanofiber membrane as claimed in claim 1, wherein:
alkalizing and squeezing the pulp, putting the mixed pulp into alkali liquor, stirring for 40-50min at 60-70 ℃ to obtain alkalized pulp, and squeezing to remove redundant alkali liquor to obtain squeezed material;
the mixed pulp comprises the following components in parts by mass: 2.5 to 3.5 portions of cotton pulp, 0.8 to 1.2 portions of bamboo pulp and 0.8 to 1.2 portions of banana stalk pulp;
the solid contents of cotton pulp, bamboo pulp and Japanese banana stalk pulp in the mixed pulp are 35-45%;
the alkali liquor is a sodium hydroxide solution with the mass concentration of 15-20%;
the mass ratio of the mixed pulp to the alkali liquor is 1: 4-6.
4. The method for preparing a nanofiber membrane as claimed in claim 1, wherein:
the crushing and aging comprises one-step ball milling crushing, two-step ball milling crushing and aging;
performing one-step ball milling and crushing, mixing the pressed material with the modified nano-cellulose, and putting the mixture into a ball mill for ball milling for 80-120min to obtain a one-step ball grinding material;
the mass ratio of the pressed material to the modified nano-cellulose is 8-12: 1;
mixing nano-cellulose with a sodium hydroxide aqueous solution with the mass concentration of 15-25%, adding ethylene glycol and konjac glucomannan, stirring at 50-70 ℃ for 25-40min, adding 2, 3-epoxypropyltrimethylammonium chloride, stirring at 50-70 ℃ for 150-200min, adding sodium carboxymethyl starch, stirring at 40-50 ℃ for 80-120min, washing with ethylene glycol to neutrality, washing with water, filtering and drying until the water content is 10-15% to obtain the modified nano-cellulose;
the mass ratio of the nano-cellulose to the sodium hydroxide aqueous solution is 4-6: 1;
the mass ratio of the ethylene glycol to the nano-cellulose is 2.5-3.5: 2;
the mass ratio of the konjac glucomannan to the nano cellulose is 1: 4-6;
the mass ratio of the 2, 3-epoxypropyltrimethylammonium chloride to the nanocellulose is 1: 3-5;
the mass ratio of the sodium carboxymethyl starch to the nano-cellulose is 1: 3-5.
5. The method for preparing a nanofiber membrane as claimed in claim 4, wherein:
and the two-step ball milling, crushing and aging are carried out, the one-step ball milling material is put into a ball mill for ball milling for 100-.
6. The method for preparing a nanofiber membrane as claimed in claim 1, wherein:
the yellowing step comprises the steps of mixing the aging material with 8-15% of sodium hydroxide aqueous solution, stirring for 15-30min at 40-50 ℃, cleaning, filtering, introducing carbon disulfide gas, and reacting for 60-90min at 20-30 ℃ to obtain a yellowing material;
the mass ratio of the aging material to the sodium hydroxide solution is 1: 4-6;
the mass ratio of the carbon disulfide gas to the aging material is 1: 7-9.
7. The method for preparing a nanofiber membrane as claimed in claim 1, wherein:
and (3) preparing the membrane, namely spraying the viscose into a coagulating bath to obtain a semi-finished product of the natural cellulose membrane, desulfurizing, dipping glycerol, and drying until the water content is 8-10% to obtain the nano cellulose membrane.
8. Use of a nanofiber membrane prepared as in claim 1 in a cellulose enteric coating.
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| CN115286828A (en) * | 2022-10-08 | 2022-11-04 | 潍坊潍森纤维新材料有限公司 | Preparation method of cellulose membrane for filling enteric-coated fabric |
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