CN117188207A - High-barrier packaging kraft paper and preparation method and application thereof - Google Patents
High-barrier packaging kraft paper and preparation method and application thereof Download PDFInfo
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- CN117188207A CN117188207A CN202311193744.5A CN202311193744A CN117188207A CN 117188207 A CN117188207 A CN 117188207A CN 202311193744 A CN202311193744 A CN 202311193744A CN 117188207 A CN117188207 A CN 117188207A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 25
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- 239000000123 paper Substances 0.000 claims abstract description 67
- 235000011609 Pinus massoniana Nutrition 0.000 claims abstract description 38
- 241000018650 Pinus massoniana Species 0.000 claims abstract description 38
- 229920002907 Guar gum Polymers 0.000 claims abstract description 31
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- 229960002154 guar gum Drugs 0.000 claims abstract description 31
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- MPNXSZJPSVBLHP-UHFFFAOYSA-N 2-chloro-n-phenylpyridine-3-carboxamide Chemical compound ClC1=NC=CC=C1C(=O)NC1=CC=CC=C1 MPNXSZJPSVBLHP-UHFFFAOYSA-N 0.000 claims description 8
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- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses high-barrier packaging kraft paper and a preparation method and application thereof. The high-barrier packaging kraft paper prepared by the invention is obtained by reasonably compounding three fiber raw materials, fully utilizes the advantages of different fibers, has good mechanical property, barrier property and antibacterial property, can be used for mildew-proof packaging materials of medicinal materials, can promote the green packaging industry to realize low-carbon development, and can be used for achieving the target power assistance of carbon neutralization and carbon peak. The masson pine fiber, paper mulberry bark fiber, cellulose nanofibrils, chitosan and guar gum used in the invention are all degradable biological base materials, and the packaging kraft paper prepared from the materials can be naturally degraded or recycled, belongs to environment-friendly packaging materials, can realize that paper is used for the field of medicinal material mildew-proof packaging materials instead of plastic, and accords with the green sustainable development concept of carbon neutralization and carbon reaching peak.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to high-barrier packaging kraft paper and a preparation method and application thereof.
Background
With the upgrading of the policies of "plastic restriction" and "plastic prohibition", and the requirement of the use amount of plastic in packaging products to be reduced, bio-based degradable materials become a research hot spot. At present, the traditional non-degradable plastic packaging materials are difficult to degrade in natural environment and difficult to treat, and do not meet the current situations of green low-carbon development and the like, while most of the degradable plastic materials in the market are low in flexibility, impact strength, elongation at break and barrier property and common resin plastics, so that the application range is limited. The paper packaging material has the advantages of degradability, recoverability, convenient transportation and the like, but the common paper packaging material is still narrow in application field in the market due to the weakness of the paper material that moisture, steam, grease, gas, smell and the like are blocked.
Kraft paper is a common packaging paper material, and is fiber paper produced by chemical pulp, long fibers provide strength for paper, the mechanical strength of the kraft paper is higher than that of common packaging paper, the kraft paper is very wide in application, has better application in the fields of medicines, foods, daily chemicals, military industry and the like, and can be used for packaging by partially replacing plastics or other high polymer materials. Kraft paper is currently used for medicine packaging in the market, but has limited mechanical strength, barrier property and antibacterial capability, and is difficult to directly use for medicine packaging. Based on the concept of carbon-to-peak carbon neutralization and sustainable development of modern green packaging, research on high-barrier packaging kraft paper has important significance.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the primary purpose of the invention is to provide a preparation method of high-barrier packaging kraft paper.
The invention also aims to provide the high-barrier packaging kraft paper prepared by the preparation method.
It is a further object of the present invention to provide the use of the high barrier packaging kraft paper.
The aim of the invention is achieved by the following technical scheme:
a method for preparing high-barrier packaging kraft paper, which comprises the following steps:
(1) Compounding fiber slurry: pulping bleached sulfate masson Pine Fiber (PF) and paper mulberry bark fiber (TF) respectively, then fully dispersing to obtain PF dispersion liquid and TF dispersion liquid, and uniformly mixing the PF dispersion liquid and the TF fiber dispersion liquid to obtain PF/TF mixed slurry;
(2) Functional auxiliary agents are added: respectively adding plant Cellulose Nanofibrils (CNF) and Antibacterial Chitosan (AC) into the PF/TF mixed slurry obtained in the step (1) under the stirring condition, and uniformly mixing to obtain PF/TF/CNF/AC compound slurry;
(3) And (3) papermaking: performing papermaking forming, dehydration and drying treatment on the PF/TF/CNF/AC compound slurry obtained in the step (2) to obtain a paper pattern A;
(4) And (3) surface spraying: spraying a surface sizing agent on the front and back surfaces of the paper pattern A obtained in the step (3), and then drying by infrared rays to obtain a paper pattern B;
(5) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample B obtained in the step (4), and then drying to obtain the high-barrier packaging kraft paper.
And (3) pulping in the step (1) by adopting a PFI mill.
The length of the bleached sulfate masson pine fiber in the step (1) is 2-10 mm, and the diameter is 32-45 mu m; the length of the paper mulberry bark fiber is 3-15 mm, and the diameter is 28-40 mu m.
In the step (1), the condition of pulping the bleached sulfate masson pine fiber is as follows: pulp revolution is 6000-8000 revolutions, pulping concentration is 2.0-3.0%, and pulping degree is 50-60 DEG SR; the pulping conditions of the paper mulberry bark fiber are as follows: the beating revolution is 7000-10000 revolutions, the beating concentration is 1.0-3.0%, and the beating degree is 45-55 DEG SR.
The bleached sulfate masson pine fiber in the dispersion treatment in the step (1) is dispersed for 10 to 20 minutes at the rotating speed of 3000 to 5000r/min at the concentration of 1.0 to 2.0 percent by mass; the paper mulberry bark fiber is dispersed for 15 to 25 minutes in the rotating speed of 4000 to 6000r/min at the concentration of 1.0 to 2.0 percent by mass.
In the step (1), in the mixed system, the absolute dry mass ratio of the bleached sulfate masson pine fiber to the paper mulberry bark fiber is (5-7): (3-5);
the diameter of the plant cellulose nanofibrils in the step (2) is 30-80 nm, and the length is 200-760 nm; preferably, the masson pine wood pulp is used as a raw material and is prepared by mechanical grinding and high-pressure homogenization; wherein, the conditions of mechanical grinding are as follows: grinding 5 times under 0 and-50 μm gap, with rotation speed of 1000+ -100 rpm; grinding 10 times under a clearance of 80 mu m at a rotating speed of 1500+/-100 rpm; grinding 15 times under a clearance of-100 mu m, wherein the rotating speed is 2000+/-200 rpm; the conditions of high-pressure homogenization are as follows: the temperature is 25 ℃, the operating pressure is 200MPa, and the cycle is 5 times.
The concentration of the plant cellulose nanofibrils in the step (2) is 3.0-4.0% by mass.
The addition amount of the plant cellulose nanofibrils in the step (2) is 1.0-6.0% of the absolute dry mass of the PF/TF/CNF/AC compound slurry.
The antibacterial chitosan in the step (2) is cationic chitosan quaternary ammonium salt, and the concentration is 1.0-3.0% by mass.
The addition amount of the antibacterial chitosan in the step (2) is 1.0-4.0% of the absolute dry mass of the PF/TF/CNF/AC compound slurry.
The stirring rotating speed in the step (2) is 4000-6000 r/min.
And (3) the paper making and forming is carried out by adopting an inclined wire paper machine.
The concentration of the PF/TF/CNF/AC compound slurry in the step (3) is 0.01-1.0% by mass.
The surface sizing agent in the step (4) is quaternary ammonium guar gum, the concentration is 1.0-2.0% by mass, and the spraying amount is 2.0-4.0 g/m 2 。
The quaternary ammonium guar gum is prepared by using guar gum as a raw material and trimethyl ammonium chloride as an etherifying agent to carry out quaternization modification;
the method specifically comprises the following steps:
uniformly dispersing guar gum powder in 75+/-3% ethanol solution, adding 0.7+/-0.3 mol/LNaOH solution, alkalizing in ice water bath for 15+/-1 min, slowly dripping trimethyl ammonium chloride, wherein the absolute dry dosage ratio of the trimethyl ammonium chloride to the guar gum powder is 0.75+/-0.05, and reacting for 2.2+/-0.2 hours at 62+/-2 ℃; then adjusting the pH value of a reaction system to be in a neutral range, performing suction filtration, washing for a plurality of times by using 63+/-3% ethanol solution, and finally drying, grinding and sieving to obtain the quaternary ammonium guar gum powder.
The infrared drying in the step (4) means that the paper sample is subjected to infrared drying for 0.5-1 hour at 100-200 ℃.
The wet and hot pressure conditions in the step (5) are as follows: the temperature is 80-95 ℃, the pressure is 16-18 MPa, and the time is 30-60 min.
The drying condition in the step (5) is that the drying is carried out for 1 to 2 hours at a temperature of between 30 and 40 ℃.
The high-barrier packaging kraft paper is prepared by the preparation method.
The performance indexes of the high-barrier packaging kraft paper are as follows: quantification: 40-45 g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Tensile strength: 2.73-3.45 kN/m; tear strength: 681.2 to 756.4mN; oxygen transmission rate: 427-518 cm 3 /m 2 Day 0.1MPa; water vapor transmission rate: 113-156 g/m 2 Day; antibacterial rate: 85-93%.
The application of the high-barrier packaging kraft paper in packaging materials.
The packaging material comprises a mildew-proof packaging material; preferably a mould proof packaging material for medicinal materials.
Compared with the prior art, the invention has the following advantages and effects:
(1) The masson pine fiber, paper mulberry bark fiber, cellulose nanofibrils, chitosan and guar gum used in the invention are all degradable biological base materials, and the packaging kraft paper prepared from the materials can be naturally degraded or recycled, belongs to environment-friendly packaging materials, can realize that paper is used for the field of medicinal material mildew-proof packaging materials instead of plastic, and accords with the green sustainable development concept of carbon neutralization and carbon reaching peak.
(2) The high-barrier packaging kraft paper prepared by the invention is obtained by reasonably compounding three fiber raw materials, and fully utilizes the advantages of different fibers: the pinus massoniana fibers are long and high in strength, so that the physical strength of finished paper can be remarkably improved; the paper mulberry bark fibers are fine and soft, the fiber form is good, the tight combination among the fibers can be ensured, and in addition, the paper mulberry bark fibers have the efficacy of promoting diuresis and killing insects, so that the antibacterial effect of kraft paper can be improved; the plant cellulose nanofibrils have nanoscale, high length-diameter ratio and large specific surface area, can be well filled between masson pine fibers and paper mulberry bark fibers, improve interfacial binding force between different fibers, enable long fibers and short fibers to be tightly connected, and improve mechanical strength of kraft paper.
(3) The cationic chitosan quaternary ammonium salt adopted by the invention has good antibacterial property, can endow kraft paper with antibacterial property, has positive charges as a whole, can form strong covalent bonds and hydrogen bond links with hydroxyl groups on the surface of cellulose, and can increase the crosslinking of fibers with different sizes and chitosan, so that the strength of the kraft paper can be increased, the pore structure of the kraft paper can be improved, and the antibacterial and oxygen-blocking capabilities can be increased.
(4) The invention adopts the quaternary ammonium guar gum to dissolve in water, not only can be directly used as a paper surface sizing agent, and the guar gum and cellulose have hydrogen bond combination, have good affinity and adsorptivity to fibers, but also have certain viscosity and barrier property, and the uniform coating process is beneficial to enabling the surface of kraft paper to be smoother, so that the coated kraft paper has good mechanical strength, toughness and barrier property. In addition, the mildew-proof property of the quaternary ammonium trimethyl ammonium chloride is still remained in the modified product quaternary ammonium guar gum, so that the quaternary ammonium guar gum has mildew-proof and antibacterial functions.
(5) The invention adopts the wet forming technology of the ultra-low concentration inclined wire paper machine, can solve the problem of easy flocculation of fibers, realizes uniform dispersion and forming of long and short fibers under ultra-low concentration, and is beneficial to improving the mechanical property of kraft paper; meanwhile, wet hot pressing treatment is adopted to facilitate softening and interweaving of fibers, so that uniformity of kraft paper is improved, various fibers in the paper base material are combined more tightly, and the kraft paper has stronger toughness and compactness.
(6) The high-barrier packaging kraft paper prepared by the invention has good mechanical property, barrier property and antibacterial property, can be used for the mildew-proof packaging material aspect of medicinal materials, can promote the green packaging industry to realize low-carbon development, and can be used for carbon neutralization and carbon peak target power assistance.
Drawings
Fig. 1 is a schematic illustration of a process for making a high barrier packaging kraft paper.
Detailed Description
The present invention will be described in further detail with reference to examples and drawings, but embodiments of the present invention are not limited thereto. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art. The test methods for specific experimental conditions are not noted in the examples below, and are generally performed under conventional experimental conditions or under experimental conditions recommended by the manufacturer. The reagents and starting materials used in the present invention are commercially available unless otherwise specified.
1. The bleached sulfate masson Pine Fiber (PF) related in the embodiment of the invention is taken from Shandong Sun paper company, inc., and has the length of 2-10 mm and the diameter of 32-45 mu m; paper mulberry bark fiber (TF) is taken from the national key laboratory of pulp and paper making engineering, and has the length of 3-15 mm and the diameter of 28-40 mu m. The cationic chitosan quaternary ammonium salt was purchased from Shandong Neurospora Biotechnology Co., ltd, and the substitution degree was 95%.
2. The plant Cellulose Nanofibrils (CNF) related in the embodiment of the invention are prepared by taking masson pine pulp (taken from Shandong Sun paper company, inc.) as a raw material through mechanical grinding and high-pressure homogenization, and have the diameter of 30-80 nm and the length of 200-760 nm; wherein, mechanical grinding: grinding 5 times under 0 and-50 μm gap, with rotation speed of 1000rpm; grinding 10 times with a gap of 80 μm at a rotation speed of 1500rpm; grinding 15 times under a clearance of-100 mu m at a rotating speed of 2000rpm; homogenizing under high pressure: the operation pressure is 200MPa, the cycle is 5 times, and the temperature is controlled at 25 ℃.
3. The quaternary ammonium guar gum is prepared by using guar gum as a raw material through quaternization modification, guar gum powder is uniformly dispersed in 75% ethanol solution, then 0.7mol/L NaOH solution is added to carry out alkalization treatment in ice water bath for 15min, then trimethyl ammonium chloride is slowly dripped, the absolute dry dosage ratio of the trimethyl ammonium chloride to the guar gum powder is 0.75, and the reaction is carried out for 2.2 hours at 62 ℃. Then adjusting the pH value of a reaction system to be in a neutral range, performing suction filtration, washing for a plurality of times by using 63% ethanol solution, finally drying, grinding and sieving to obtain quaternary ammonium guar gum powder, and preparing the quaternary ammonium guar gum powder into a certain concentration for use during spraying.
4. The detection of various parameters related in the embodiment of the invention is carried out according to a national standard detection method and an industry standard, and specifically comprises the following steps:
(1) quantification (GB/T451.2-2002);
(2) tensile strength (GB/T453-2002);
(3) tear strength (GB/T455-2002);
(4) oxygen transmission rate (GB/T19789-2005);
(5) water vapor transmission rate (GB/T22921-2008);
(6) antibacterial rate (GB 15979-2002), the colony is selected from staphylococcus aureus or escherichia coli.
A schematic of the process for making high barrier packaging kraft paper is shown in fig. 1.
Example 1
The embodiment provides a preparation method of high-barrier packaging kraft paper, which comprises the following specific preparation steps:
(1) Compounding fiber slurry: pulping bleached sulfate masson pine fiber (with the length of 2-10 mm and the diameter of 32-45 mu m) in a PFI mill, wherein the pulping revolution is 6000 revolutions, the pulping concentration is 2.0wt% and the pulping degree is 50 DEG SR; paper mulberry bark fiber (length of 3-15 mm, diameter of 28-40 μm) is pulped in PFI mill, the number of pulping revolution is 7000 revolutions, the pulping concentration is 1.0%, and the pulping degree is 45 DEG SR. Then dispersing bleached sulfate masson pine fiber in an electric dispersing machine with the rotating speed of 3000r/min for 10min at the concentration of 1.0 mass percent; paper mulberry bark fiber is dispersed for 15min in an electric dispersing machine with the rotating speed of 4000r/min at the concentration of 1.0 percent by mass. Finally, the dispersion-treated bleached sulfate masson pine fiber dispersion liquid and paper mulberry bark fiber dispersion liquid are subjected to absolute dry mass ratio of 5:5, uniformly mixing to obtain PF/TF mixed slurry solution.
(2) Functional auxiliary agents are added: and (3) respectively adding a plant Cellulose Nanofibril (CNF) suspension with the mass concentration of 3.0 percent (with the diameter of 30-80 nm and the length of 200-760 nm) and a cationic chitosan quaternary ammonium salt with the mass concentration of 1.0 percent (AC, the substitution degree of 95%) into the PF/TF mixed slurry solution in the step (1) under the condition of high-speed stirring (rotating speed: 4000 r/min), and uniformly mixing to prepare the PF/TF/CNF/AC compound slurry, wherein the addition amounts of CNF and AC (absolute) are 1.0 percent and 1.0 percent of the absolute mass of the PF/TF/CNF/AC compound slurry.
(3) And (3) papermaking: and (3) carrying out papermaking forming, dehydration and drying treatment on the PF/TF/CNF/AC compound slurry obtained in the step (2) on an inclined wire paper machine at a slurry concentration of 0.01wt% to obtain a paper pattern A.
(4) And (3) surface spraying: spraying quaternary ammonium guar gum with the mass concentration of 1.0% on the front and back surfaces of the paper sample A obtained in the step (3), wherein the spraying amount is 2.0g/m 2 And then the paper pattern is subjected to infrared drying for 30min at 100 ℃ by using an electric infrared generator, so as to obtain a paper pattern B.
(5) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample B obtained in the step (4) for 30min at the temperature of 80 ℃ and the pressure of 16MPa, and then drying at the temperature of 30 ℃ for 1 hour to obtain the high-barrier packaging kraft paper.
The performance indexes of the high-barrier packaging kraft paper prepared in the embodiment are as follows: quantification: 40g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Tensile strength: 2.73kN/m; tear strength: 681.2mN; oxygen transmission rate: 518cm 3 /m 2 Day 0.1MPa; water vapor transmission rate: 156g/m 2 Day; antibacterial rate: 85%.
Example 2
The embodiment provides a preparation method of high-barrier packaging kraft paper, which comprises the following specific preparation steps:
(1) Compounding fiber slurry: pulping bleached sulfate masson pine fiber (with the length of 2-10 mm and the diameter of 32-45 mu m) in a PFI mill, wherein the pulping revolution is 6000 revolutions, the pulping concentration is 2.5wt% and the pulping degree is 55 DEG SR; paper mulberry bark fiber (length of 3-15 mm, diameter of 28-40 μm) is beaten in PFI mill, beating revolution is 8000, beating concentration is 2.0%, beating degree is 50 DEG SR. Then dispersing bleached sulfate masson pine fiber in an electric dispersing machine with the rotating speed of 4000r/min for 15min at the concentration of 1.5 mass percent; paper mulberry bark fiber is dispersed for 20min in an electric dispersing machine with the rotating speed of 5000r/min at the concentration of 1.5 percent by mass. Finally, the bleached sulfate masson pine fiber dispersion liquid and paper mulberry bark fiber dispersion liquid after the dispersion treatment are subjected to absolute dry mass ratio of 6:5, uniformly mixing to obtain PF/TF mixed slurry solution.
(2) Functional auxiliary agents are added: and (3) respectively adding a plant Cellulose Nanofibril (CNF) suspension with the mass concentration of 3.5 percent (with the diameter of 30-80 nm and the length of 200-760 nm) and a cationic chitosan quaternary ammonium salt with the mass concentration of 2.0 percent (AC, the substitution degree of 95%) into the PF/TF mixed slurry solution in the step (1) under the condition of high-speed stirring (rotating speed: 5000 r/min), and uniformly mixing to prepare PF/TF/CNF/AC compound slurry, wherein the addition amounts of CNF and AC (absolute) are 3.0 percent and 2.0 percent of the absolute mass of the PF/TF/CNF/AC compound slurry.
(3) And (3) papermaking: and (3) carrying out papermaking forming, dehydration and drying treatment on the PF/TF/CNF/AC compound slurry obtained in the step (2) on an inclined wire paper machine at a slurry concentration of 0.1wt% to obtain a paper pattern A.
(4) And (3) surface spraying: spraying quaternary ammonium guar gum with the mass concentration of 1.5% on the front and back surfaces of the paper sample A obtained in the step (3), wherein the spraying amount is 3.0g/m 2 And then the paper pattern is subjected to infrared drying for 40min at 140 ℃ by using an electric infrared generator, so as to obtain a paper pattern B.
(5) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample B obtained in the step (4) for 40min at the temperature of 85 ℃ and the pressure of 17MPa, and then drying at the temperature of 35 ℃ for 1.5 hours to obtain the high-barrier packaging kraft paper.
The performance indexes of the high-barrier packaging kraft paper prepared in the embodiment are as follows: quantification: 42g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Tensile strength: 2.95kN/m; tear strength: 703.5mN; oxygen transmission rate: 494cm 3 /m 2 Day 0.1MPa; water vapor transmission rate: 137g/m 2 Day; antibacterial rate: 88%.
Example 3
The embodiment provides a preparation method of high-barrier packaging kraft paper, which comprises the following specific preparation steps:
(1) Compounding fiber slurry: pulping bleached sulfate masson pine fiber (with the length of 2-10 mm and the diameter of 32-45 mu m) in a PFI mill, wherein the pulping revolution is 7000 revolutions, the pulping concentration is 2.5wt% and the pulping degree is 60 DEG SR; paper mulberry bark fiber (length of 3-15 mm, diameter of 28-40 μm) is pulped in PFI mill, the number of pulping revolution is 9000 revolutions, the pulping concentration is 3.0%, and the pulping degree is 50 DEG SR. Then dispersing the bleached sulfate masson pine fiber in an electric dispersing machine with the rotating speed of 5000r/min for 20min at the concentration of 2.0 mass percent; paper mulberry bark fiber is dispersed in an electric dispersing machine with the rotating speed of 6000r/min for 25min at the concentration of 1.5 percent by mass. Finally, the bleached sulfate masson pine fiber dispersion liquid and paper mulberry bark fiber dispersion liquid after the dispersion treatment are subjected to absolute dry mass ratio of 7:4, uniformly mixing to obtain PF/TF mixed slurry solution.
(2) Functional auxiliary agents are added: adding 4.0% mass concentration plant Cellulose Nanofibril (CNF) suspension (CNF diameter is 30-80 nm, length is 200-760 nm) and 2.5% mass concentration cationic chitosan quaternary ammonium salt (AC, substitution degree is 95%) into PF/TF mixed slurry solution in step (1) under high-speed stirring (rotation speed: 6000 r/min), mixing uniformly, and obtaining PF/TF/CNF/AC compound slurry, wherein the addition amount of CNF and AC (absolute dry) is 5.0% and 3.0% of absolute dry mass of PF/TF/CNF/AC compound slurry.
(3) And (3) papermaking: and (3) carrying out papermaking forming, dehydration and drying treatment on the PF/TF/CNF/AC compound slurry obtained in the step (2) on an inclined wire paper machine at a slurry concentration of 0.5wt% to obtain a paper pattern A.
(4) And (3) surface spraying: spraying quaternary ammonium guar gum with the mass concentration of 2.0% on the front and back surfaces of the paper sample A obtained in the step (3), wherein the spraying amount is 3.5g/m 2 And then the paper pattern is subjected to infrared drying for 50min at 180 ℃ by using an electric infrared generator, so that a paper pattern B is obtained.
(5) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample B obtained in the step (4) for 50min at the temperature of 90 ℃ and the pressure of 18MPa, and then drying at the temperature of 35 ℃ for 2 hours to obtain the high-barrier packaging kraft paper.
The performance indexes of the high-barrier packaging kraft paper prepared in the embodiment are as follows: quantification: 43g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Tensile strength: 3.14kN/m; tear strength: 731.8mN; oxygen transmission rate: 456cm 3 /m 2 Day 0.1MPa; water vapor transmission rate: 126g/m 2 Day; antibacterial rate: 91%.
Example 4
The embodiment provides a preparation method of high-barrier packaging kraft paper, which comprises the following specific preparation steps:
(1) Compounding fiber slurry: pulping bleached sulfate masson pine fiber (with the length of 2-10 mm and the diameter of 32-45 mu m) in a PFI mill, wherein the pulping revolution is 8000, the pulping concentration is 3.0wt% and the pulping degree is 60 DEG SR; paper mulberry bark fiber (length is 3-15 mm, diameter is 28-40 μm) is pulped in PFI mill, the number of pulping revolution is 10000, pulping concentration is 3.0%, and pulping degree is 55 DEG SR. Then dispersing the bleached sulfate masson pine fiber in an electric dispersing machine with the rotating speed of 5000r/min for 20min at the concentration of 2.0 mass percent; paper mulberry bark fiber is dispersed in an electric dispersing machine with the rotating speed of 6000r/min for 25min at the concentration of 2.0 percent by mass. Finally, the bleached sulfate masson pine fiber dispersion liquid and paper mulberry bark fiber dispersion liquid after the dispersion treatment are subjected to absolute dry mass ratio of 7:3, uniformly mixing to obtain PF/TF mixed slurry solution.
(2) Functional auxiliary agents are added: adding 4.0% mass concentration plant Cellulose Nanofibril (CNF) suspension (CNF diameter is 30-80 nm, length is 200-760 nm) and 3.0% mass concentration cationic chitosan quaternary ammonium salt (AC, substitution degree is 95%) into PF/TF mixed slurry solution in step (1) under high-speed stirring (rotation speed: 6000 r/min), mixing uniformly, and obtaining PF/TF/CNF/AC compound slurry, wherein the addition amount of CNF and AC (absolute dry) is 6.0% and 4.0% of absolute dry mass of PF/TF/CNF/AC compound slurry.
(3) And (3) papermaking: and (3) carrying out papermaking forming, dehydration and drying treatment on the PF/TF/CNF/AC compound slurry obtained in the step (2) on an inclined wire paper machine at a slurry concentration of 1.0wt% to obtain a paper pattern A.
(4) And (3) surface spraying: spraying quaternary ammonium guar gum with the mass concentration of 2.0% on the front and back surfaces of the paper sample A obtained in the step (3), wherein the spraying amount is 4.0g/m 2 And then the paper pattern is subjected to infrared drying for 60min at 200 ℃ by using an electric infrared generator, so as to obtain a paper pattern B.
(5) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample B obtained in the step (4) for 60min at the temperature of 95 ℃ and the pressure of 18MPa, and then drying at the temperature of 40 ℃ for 2 hours to obtain the high-barrier packaging kraft paper.
The performance indexes of the high-barrier packaging kraft paper prepared in the embodiment are as follows: quantification: 45g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Tensile strength: 3.45kN/m; tear strength: 756.4mN; oxygen transmission rate: 427cm 3 /m 2 Day 0.1MPa; water vapor transmission rate: 113g/m 2 Day; antibacterial rate: 93%.
Comparative example 1
The comparative example provides a preparation method of packaging kraft paper, which comprises the following specific preparation steps:
(1) Compounding fiber slurry: pulping bleached sulfate masson pine fiber (with the length of 2-10 mm and the diameter of 32-45 mu m) in a PFI mill, wherein the pulping revolution is 6000 revolutions, the pulping concentration is 2.0wt% and the pulping degree is 50 DEG SR; paper mulberry bark fiber (length of 3-15 mm, diameter of 28-40 μm) is pulped in PFI mill, the number of pulping revolution is 7000 revolutions, the pulping concentration is 1.0%, and the pulping degree is 45 DEG SR. Then dispersing bleached sulfate masson pine fiber in an electric dispersing machine with the rotating speed of 3000r/min for 10min at the concentration of 1.0 mass percent; paper mulberry bark fiber is dispersed for 15min in an electric dispersing machine with the rotating speed of 4000r/min at the concentration of 1.0 percent by mass. Finally, the dispersion-treated bleached sulfate masson pine fiber dispersion liquid and paper mulberry bark fiber dispersion liquid are subjected to absolute dry mass ratio of 5:5, uniformly mixing to obtain PF/TF mixed slurry solution.
(2) Functional auxiliary agents are added: adding cationic chitosan quaternary ammonium salt (AC, substitution degree 95%) with mass concentration of 1.0% into the PF/TF mixed slurry solution in the step (1) under the condition of high-speed stirring (rotating speed: 4000 r/min), and uniformly mixing to obtain PF/TF/AC compound slurry, wherein the addition amount of AC (absolute dry) is 1.0% of the absolute dry mass of the PF/TF/AC compound slurry respectively.
(3) And (3) papermaking: and (3) carrying out papermaking forming, dehydration and drying treatment on the PF/TF/AC compound slurry obtained in the step (2) on an inclined wire paper machine at a slurry concentration of 0.01wt% to obtain a paper sample A.
(4) And (3) surface spraying: spraying quaternary ammonium guar gum with the mass concentration of 1.0% on the front and back surfaces of the paper sample A obtained in the step (3), wherein the spraying amount is 2.0g/m 2 And then the paper pattern is subjected to infrared drying for 30min at 100 ℃ by using an electric infrared generator, so as to obtain a paper pattern B.
(5) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample B obtained in the step (4) for 30min at the temperature of 80 ℃ and the pressure of 16MPa, and then drying at the temperature of 30 ℃ for 1 hour to obtain the packaging kraft paper.
The performance index of the packaging kraft paper prepared in this example is as follows: quantification: 40g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Tensile strength: 1.82kN/m; tear strength: 477.5mN; oxygen transmission rate: 603cm 3 /m 2 Day 0.1MPa; water vapor transmission rate: 194g/m 2 Day; antibacterial rate: 82%.
Comparative example 2
The comparative example provides a preparation method of packaging kraft paper, which comprises the following specific preparation steps:
(1) Compounding fiber slurry: pulping bleached sulfate masson pine fiber (with the length of 2-10 mm and the diameter of 32-45 mu m) in a PFI mill, wherein the pulping revolution is 6000 revolutions, the pulping concentration is 2.0wt% and the pulping degree is 50 DEG SR; paper mulberry bark fiber (length of 3-15 mm, diameter of 28-40 μm) is pulped in PFI mill, the number of pulping revolution is 7000 revolutions, the pulping concentration is 1.0%, and the pulping degree is 45 DEG SR. Then dispersing bleached sulfate masson pine fiber in an electric dispersing machine with the rotating speed of 3000r/min for 10min at the concentration of 1.0 mass percent; paper mulberry bark fiber is dispersed for 15min in an electric dispersing machine with the rotating speed of 4000r/min at the concentration of 1.0 percent by mass. Finally, the dispersion-treated bleached sulfate masson pine fiber dispersion liquid and paper mulberry bark fiber dispersion liquid are subjected to absolute dry mass ratio of 5:5, uniformly mixing to obtain PF/TF mixed slurry solution.
(2) Functional auxiliary agents are added: adding a plant Cellulose Nanofibril (CNF) suspension with the mass concentration of 3.0% into the PF/TF mixed slurry solution in the step (1) under the condition of high-speed stirring (rotating speed: 4000 r/min), and uniformly mixing to obtain PF/TF/CNF compound slurry, wherein the addition amount of CNF (absolute dry) is 1.0% of the absolute dry mass of the PF/TF/CNF compound slurry.
(3) And (3) papermaking: and (3) carrying out papermaking forming, dehydration and drying treatment on the PF/TF/CNF compound slurry obtained in the step (2) on an inclined wire paper machine at a slurry concentration of 0.01wt% to obtain a paper pattern A.
(4) And (3) surface spraying: the front and back surfaces of the paper sample A obtained in the step (3) are bothSpraying quaternary ammonium guar gum with mass concentration of 1.0%, and spraying amount of 2.0g/m 2 And then the paper pattern is subjected to infrared drying for 30min at 100 ℃ by using an electric infrared generator, so as to obtain a paper pattern B.
(5) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample B obtained in the step (4) for 30min at the temperature of 80 ℃ and the pressure of 16MPa, and then drying at the temperature of 30 ℃ for 1 hour to obtain the packaging kraft paper.
The performance index of the packaging kraft paper prepared in this example is as follows: quantification: 40g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Tensile strength: 2.47kN/m; tear strength: 654.8mN; oxygen transmission rate: 545cm 3 /m 2 Day 0.1MPa; water vapor transmission rate: 166g/m 2 Day; antibacterial rate: 64%.
Comparative example 3
The comparative example provides a preparation method of packaging kraft paper, which comprises the following specific preparation steps:
(1) Compounding fiber slurry: pulping bleached sulfate masson pine fiber (with the length of 2-10 mm and the diameter of 32-45 mu m) in a PFI mill, wherein the pulping revolution is 6000 revolutions, the pulping concentration is 2.0wt% and the pulping degree is 50 DEG SR; paper mulberry bark fiber (length of 3-15 mm, diameter of 28-40 μm) is pulped in PFI mill, the number of pulping revolution is 7000 revolutions, the pulping concentration is 1.0%, and the pulping degree is 45 DEG SR. Then dispersing bleached sulfate masson pine fiber in an electric dispersing machine with the rotating speed of 3000r/min for 10min at the concentration of 1.0 mass percent; paper mulberry bark fiber is dispersed for 15min in an electric dispersing machine with the rotating speed of 4000r/min at the concentration of 1.0 percent by mass. Finally, the dispersion-treated bleached sulfate masson pine fiber dispersion liquid and paper mulberry bark fiber dispersion liquid are subjected to absolute dry mass ratio of 5:5, uniformly mixing to obtain PF/TF mixed slurry solution.
(2) Functional auxiliary agents are added: and (3) respectively adding a plant Cellulose Nanofibril (CNF) suspension with the mass concentration of 3.0 percent (with the diameter of 30-80 nm and the length of 200-760 nm) and a cationic chitosan quaternary ammonium salt with the mass concentration of 1.0 percent (AC, the substitution degree of 95%) into the PF/TF mixed slurry solution in the step (1) under the condition of high-speed stirring (rotating speed: 4000 r/min), and uniformly mixing to prepare the PF/TF/CNF/AC compound slurry, wherein the addition amounts of CNF and AC (absolute) are 1.0 percent and 1.0 percent of the absolute mass of the PF/TF/CNF/AC compound slurry.
(3) And (3) papermaking: and (3) carrying out papermaking forming, dehydration and drying treatment on the PF/TF/CNF/AC compound slurry obtained in the step (2) on an inclined wire paper machine at a slurry concentration of 0.01wt% to obtain a paper pattern A.
(4) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample A obtained in the step (3) for 30min at the temperature of 80 ℃ and the pressure of 16MPa, and then drying at the temperature of 30 ℃ for 1 hour to obtain the packaging kraft paper.
The performance index of the packaging kraft paper prepared in this example is as follows: quantification: 40g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the Tensile strength: 2.14kN/m; tear strength: 603.5mN; oxygen transmission rate: 594cm 3 /m 2 Day 0.1MPa; water vapor transmission rate: 186g/m 2 Day; antibacterial rate: 47%.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (10)
1. A preparation method of high-barrier packaging kraft paper is characterized by comprising the following steps: the method comprises the following steps:
(1) Compounding fiber slurry: respectively pulping bleached sulfate masson pine fiber PF and paper mulberry bark fiber TF, then fully dispersing to obtain PF dispersion liquid and TF dispersion liquid, and uniformly mixing the PF dispersion liquid and the TF fiber dispersion liquid to obtain PF/TF mixed slurry;
(2) Functional auxiliary agents are added: respectively adding the plant cellulose nanofibrils CNF and the antibacterial chitosan AC into the PF/TF mixed slurry obtained in the step (1) under the stirring condition, and uniformly mixing to obtain PF/TF/CNF/AC compound slurry;
(3) And (3) papermaking: performing papermaking forming, dehydration and drying treatment on the PF/TF/CNF/AC compound slurry obtained in the step (2) to obtain a paper pattern A;
(4) And (3) surface spraying: spraying a surface sizing agent on the front and back surfaces of the paper pattern A obtained in the step (3), and then drying by infrared rays to obtain a paper pattern B;
(5) And (3) hot rolling: and (3) carrying out wet hot pressing treatment on the paper sample B obtained in the step (4), and then drying to obtain the high-barrier packaging kraft paper.
2. The method of manufacturing according to claim 1, characterized in that:
in the step (1), in the mixed system, the absolute dry mass ratio of the bleached sulfate masson pine fiber to the paper mulberry bark fiber is (5-7): (3-5);
the concentration of the plant cellulose nanofibrils in the step (2) is 3.0-4.0% by mass;
the addition amount of the plant cellulose nanofibrils in the step (2) is 1.0-6.0% of the absolute dry mass of the PF/TF/CNF/AC compound slurry;
the antibacterial chitosan in the step (2) is cationic chitosan quaternary ammonium salt, and the concentration is 1.0-3.0% by mass;
the addition amount of the antibacterial chitosan in the step (2) is 1.0-4.0% of the absolute dry mass of the PF/TF/CNF/AC compound slurry;
the surface sizing agent in the step (4) is quaternary ammonium guar gum, the concentration is 1.0-2.0% by mass, and the spraying amount is 2.0-4.0 g/m 2 ；
The quaternary ammonium guar gum is prepared by using guar gum as a raw material and trimethyl ammonium chloride as an etherifying agent to carry out quaternization modification.
3. The preparation method according to claim 2, characterized in that:
the preparation method of the quaternary ammonium guar gum comprises the following steps:
uniformly dispersing guar gum powder in 75+/-3% ethanol solution, adding 0.7+/-0.3 mol/LNaOH solution, alkalizing in ice water bath for 15+/-1 min, slowly dripping trimethyl ammonium chloride, wherein the absolute dry dosage ratio of the trimethyl ammonium chloride to the guar gum powder is 0.75+/-0.05, and reacting for 2.2+/-0.2 hours at 62+/-2 ℃; then adjusting the pH value of a reaction system to be in a neutral range, performing suction filtration, washing for a plurality of times by using 63+/-3% ethanol solution, and finally drying, grinding and sieving to obtain the quaternary ammonium guar gum powder.
4. The method of manufacturing according to claim 1, characterized in that:
the length of the bleached sulfate masson pine fiber in the step (1) is 2-10 mm, and the diameter is 32-45 mu m; the length of the paper mulberry bark fiber is 3-15 mm, and the diameter is 28-40 mu m;
the diameter of the plant cellulose nanofibrils in the step (2) is 30-80 nm, and the length is 200-760 nm.
5. The method of manufacturing according to claim 1, characterized in that:
in the step (1), the condition of pulping the bleached sulfate masson pine fiber is as follows: pulp revolution is 6000-8000 revolutions, pulping concentration is 2.0-3.0%, and pulping degree is 50-60 DEG SR; the pulping conditions of the paper mulberry bark fiber are as follows: the beating revolution is 7000-10000 revolutions, the beating concentration is 1.0-3.0%, and the beating degree is 45-55 DEG SR;
the bleached sulfate masson pine fiber in the dispersion treatment in the step (1) is dispersed for 10 to 20 minutes at the rotating speed of 3000 to 5000r/min at the concentration of 1.0 to 2.0 percent by mass; the paper mulberry bark fiber is dispersed for 15 to 25 minutes in the rotating speed of 4000 to 6000r/min at the concentration of 1.0 to 2.0 percent by mass percent;
the concentration of the PF/TF/CNF/AC compound slurry in the step (3) is 0.01-1.0% by mass.
6. The method of manufacturing according to claim 1, characterized in that:
the stirring rotating speed in the step (2) is 4000-6000 r/min;
the infrared drying in the step (4) means that the paper sample is subjected to infrared drying for 0.5 to 1 hour at the temperature of 100 to 200 ℃;
the wet and hot pressure conditions in the step (5) are as follows: the temperature is 80-95 ℃, the pressure is 16-18 MPa, and the time is 30-60 min;
the drying condition in the step (5) is that the drying is carried out for 1 to 2 hours at a temperature of between 30 and 40 ℃.
7. A high barrier packaging kraft paper, characterized in that: is prepared by the preparation method according to any one of claims 1 to 6.
8. Use of the high barrier packaging kraft paper of claim 7 in packaging materials.
9. The use according to claim 8, characterized in that: the packaging material comprises a mildew-proof packaging material.
10. The use according to claim 9, wherein the packaging material is a mould proof packaging material for medicinal materials.
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| CN117552265A (en) * | 2023-12-26 | 2024-02-13 | 丽的包装(广东)有限公司 | Degradable polylactic acid kraft paper composite material and application thereof |
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