CN111608018A - Preparation method of low-basis-weight high-permeability packaging base paper - Google Patents
Preparation method of low-basis-weight high-permeability packaging base paper Download PDFInfo
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- CN111608018A CN111608018A CN202010318136.2A CN202010318136A CN111608018A CN 111608018 A CN111608018 A CN 111608018A CN 202010318136 A CN202010318136 A CN 202010318136A CN 111608018 A CN111608018 A CN 111608018A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/06—Wet spinning methods
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/24—Formation of filaments, threads, or the like with a hollow structure; Spinnerette packs therefor
- D01D5/247—Discontinuous hollow structure or microporous structure
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
- D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/28—Starch
- D21H17/29—Starch cationic
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a preparation method of low-basis weight high-permeability packaging base paper, which relates to the technical field of papermaking and comprises the following preparation steps: (1) pulping: mixing the bleached needle-leaf pulp and the bleached broad-leaf pulp and grinding into thick liquid; (2) fiber addition: adding the porous hollow fiber into the slurry and uniformly mixing; (3) addition of an auxiliary agent: adding the internal sizing agent and the sizing agent into the sizing agent and uniformly mixing; (4) and (3) dehydrating: squeezing and dewatering the slurry; (5) drying in a drying cylinder: drying the dehydrated slurry; (6) coiling and packaging; the invention adopts the porous hollow fiber to replace other fibers to prepare the packaging base paper, so that the packaging base paper has higher air permeability, better strength under low basis weight, no paper holes and the like.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a preparation method of low-basis-weight high-permeability packaging base paper.
Background
Along with the increasing of living standard, the packaging industry is rapidly developed, at present, the packaging position in improving daily life of people is increasingly shown, the development is listed in national economy and social development plans, wherein the packaging material is an important component in a packaging industry system, and the packaging base paper is the basis of the packaging material; the packaging base paper has wide application, when the packaging base paper is used for packaging fruits, vegetables and other products needing to be preserved, the packaging base paper has good air permeability, and in order to reduce cost, the packaging base paper has low quantitative quantity, so that the problems of holes and the like often occur, and the packaging paper in the prior art is poor in air permeability.
For example, a method for producing a low basis weight wrapping paper disclosed in chinese patent document, which is publication No. CN109295812A, discloses a method for producing a low basis weight wrapping paper, comprising the steps of: s1: selecting paper pulp, namely adding national waste and daily waste serving as waste paper into a pulper in a ratio of 1:3 for pulping to form paper pulp; s2: removing impurities to prepare pulp, wherein the pulp is input into a grinding disc for pulping after impurities are removed by a pressure screen and a slag remover in sequence, so as to prepare the pulp; s3: adding auxiliary materials, and adding the auxiliary materials into the slurry; s4: dewatering, namely pumping the slurry added with the auxiliary materials to a net part for forming and dewatering, and then conveying the slurry to a press part for continuous dewatering; s5: and drying and forming, conveying the squeezed pulp to a drying part, and drying the pulp to the dryness of 95% by the drying part to obtain the finished packaging paper. However, the packaging paper has poor air permeability and cannot be applied to packaging of fruits, vegetables and other products needing to be preserved.
Disclosure of Invention
The invention provides a preparation method of low-basis-weight high-permeability packaging base paper, aiming at overcoming the problems that the packaging base paper in the prior art is poor in air permeability and holes are often formed.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method of low-basis weight high-permeability packaging base paper comprises the following preparation steps:
(1) pulping: mixing the bleached needle-leaf pulp and the bleached broad-leaf pulp and grinding into thick liquid;
(2) fiber addition: adding the porous hollow fiber into the slurry and uniformly mixing;
(3) addition of an auxiliary agent: adding the internal sizing agent and the sizing agent into the sizing agent and uniformly mixing;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) and (6) coiling and packaging.
When the packaging base paper is prepared, firstly, bleached softwood pulp and bleached broad-leaved pulp are mixed and ground into pulp, and then porous hollow fibers are added into the pulp after pulping, the inventor finds that although the packaging base paper with lower ration and better air permeability can be prepared through some proportion and technological optimization, the prepared packaging base paper is always loose and can generate hole phenomena frequently, and the air permeability of the packaging base paper is generally endowed through the holes, so that the packaging base paper does not accord with the original purpose of research and development of the inventor; therefore, in order to obtain the packaging base paper with high air permeability, the porous hollow fibers are prepared by the method, the porous hollow fibers are used for replacing part of raw material fibers, the air permeability of the packaging base paper is greatly increased, the prepared packaging base paper does not need to be too loose when the ration is low, the phenomenon of large holes is prevented, and meanwhile, the porous hollow fibers have good strength and toughness, so the prepared packaging base paper also has good strength. During process research and development, the inventor firstly adopts hollow fibers to prepare the packaging base paper, the hollow fibers are in a hollow tubular shape, however, after the finished paper is prepared, the arrangement direction of the fibers and the gas permeation direction are often vertical, and the hollow fibers can endow the packaging base paper with certain air permeability but cannot meet the requirements; compared with hollow fibers, the porous hollow fibers prepared by the invention have higher porosity on the side walls, and air can permeate through pores in the side walls after the porous hollow fibers are made into finished packaging base paper, so that the air permeability of the packaging base paper is greatly increased. The preparation method is simple and convenient and is suitable for industrial production.
Preferably, the mass ratio of the bleached needle pulp to the bleached broad-leaved pulp in the step (1) is 3-5:5-7, and the beating degree is 25-35 DEG SR.
Preferably, the porous hollow fiber is used in the step (2) in an amount of 100-150kg per ton of paper.
Under the proportion, the prepared packaging base paper has better air permeability.
Preferably, the preparation method of the porous hollow fiber in the step (2) comprises the following steps:
s1: placing the fibrilia into the dispersion liquid, and then mixing the fibrilia into calcium carbonate particles to obtain spinning pre-liquid;
s2: taking an acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath through a coaxial spinning head, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber in an acetic acid solution for normal-temperature aging;
s4: and washing and drying the aged hollow fiber to prepare the porous hollow fiber.
The invention is characterized in that when preparing the porous hollow fiber, firstly, fibrilia is dispersed in dispersion liquid, then, acetone solution is used as a coagulating bath and a spinning core layer liquid, spinning pre-liquid and the spinning core layer liquid are injected into the coagulating bath through a coaxial spinning head at the same flow rate, and the hollow fiber is obtained through wet spinning. While aging, the acetic acid solution can dissolve calcium carbonate particles and release gas, so that the porosity of the side wall of the hollow fiber is further increased, and the air permeability is increased; and finally, washing and drying the aged hollow fibers to prepare the porous hollow fibers, wherein the porous hollow fibers are hollow aerogel fibers, and the side walls of the porous hollow fibers are further provided with holes, so that the air permeability is high.
Furthermore, the inner diameter and the outer diameter of the prepared porous hollow fiber can be changed by changing the inner diameter and the outer diameter of the coaxial spinning head and the flow rate, the inner diameter of the porous hollow fiber is preferably 35-50 μm, the outer diameter is preferably 90-120 μm, and the prepared packaging base paper has better strength in the range.
Preferably, the dispersion liquid in step S1 is a sodium hydroxide/urea/water mixed solution, wherein the sodium hydroxide content is 7wt% and the urea content is 12 wt%.
Preferably, the mass fraction of the hemp fiber in step S1 is 4-10wt%, and the calcium carbonate particles are added in an amount of 0.5-1.5wt% of the mass of the dispersion.
Preferably, the concentration of the acetic acid solution in the step S3 is 1-2 wt%.
Preferably, the size gum in the step (3) is cationic starch, and the dosage of the size gum per ton of paper is 5-15 kg.
Preferably, the sizing agent in step (3) is AKD, and the dosage of each ton of paper is 5-10 kg.
Preferably, the porous hollow fiber is oxidatively modified: adding tetramethylpiperidine nitrogen oxide and a sodium bromide aqueous solution into a 10-15wt% porous hollow fiber/water mixed solution, stirring, slowly adding sodium hypochlorite with the mass of 0.1-0.2% relative to the mass of the porous hollow fiber/water mixed solution, stabilizing the pH to 10-11 by using a sodium hydroxide solution, reacting for 1-2h, washing with water to be neutral, and drying to obtain the oxidation modified porous hollow fiber.
Furthermore, the concentration of the tetramethylpiperidine oxynitride in the aqueous solution of the tetramethylpiperidine oxynitride and the sodium bromide is 0.01-0.02 wt%, the concentration of the sodium bromide is 0.015-0.025 wt%, and the mass ratio of the porous hollow fiber/water mixed solution to the tetramethylpiperidine oxynitride to the aqueous solution of the sodium bromide is 1: 6-7.
The oxidation mechanism of the oxidation modification treatment of the porous hollow fiber is that hydroxyl on the surface of the porous hollow fiber is oxidized into aldehyde group by adding sodium hypochlorite under the catalysis of tetramethylpiperidine oxynitride and sodium bromide, and when the porous hollow fiber after the oxidation modification treatment is used for papermaking, the aldehyde group on the surface of the porous hollow fiber and the hydroxyl on the surface of the fiber can generate hemiacetal reaction to form covalent bond connection between the fibers, thereby improving the wet strength of the porous hollow fiber.
In addition, in the oxidation process, the content of sodium hypochlorite must be controlled within a limited range, if the content of sodium hypochlorite is too high, hydroxyl groups on the porous hollow fibers are oxidized into carboxyl groups, and if the content of sodium hypochlorite is too low, the oxidation is incomplete, and the wet strength is also reduced.
Therefore, the invention has the following beneficial effects:
(1) the preparation method adopts the porous hollow fibers to replace other fibers to prepare the packaging base paper, so that the packaging base paper has higher air permeability, better strength under low basis weight, no paper holes and the like;
(2) according to the invention, the porous hollow fibers are further subjected to oxidation modification, so that the bonding force between the porous hollow fibers and the fibers is better, and the wet strength of the porous hollow fibers is increased.
Detailed Description
The invention is further described with reference to specific embodiments.
General example: a low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing and grinding bleached needle-leaf pulp and bleached broad-leaf pulp, wherein the mass ratio of the bleached needle-leaf pulp to the bleached broad-leaf pulp is 3-5:5-7, and the beating degree is 25-35 DEG SR;
(2) fiber addition: adding the porous hollow fiber into the slurry and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fiber is 100-150 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 5-15kg, and the dosage of each ton of sizing agent AKD is 5-10 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution of the fibrilia with the mass fraction of 4-10wt%, and then mixing calcium carbonate particles with the mass of 0.5-1.5wt% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: using 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath through a coaxial spinning head at the flow velocity of 2-4m/min, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 1-2wt% acetic acid solution for aging for 0.5-1h at normal temperature;
s4: washing and drying the aged hollow fiber to prepare the porous hollow fiber; the prepared porous hollow fiber has an inner diameter of 35-50 μm and an outer diameter of 90-120 μm.
The porous hollow fiber is subjected to oxidation modification: adding tetramethylpiperidine nitrogen oxide and a sodium bromide aqueous solution (wherein the concentration of the tetramethylpiperidine nitrogen oxide is 0.01-0.02 wt% and the concentration of the sodium bromide is 0.015-0.025 wt%) into a 10-15wt% porous hollow fiber/water mixed solution, wherein the mass ratio of the porous hollow fiber/water mixed solution to the tetramethylpiperidine nitrogen oxide and the sodium bromide aqueous solution is 1:6-7, slowly adding sodium hypochlorite which is 0.1-0.2% of the mass of the porous hollow fiber/water mixed solution after stirring, stabilizing the pH to 10-11 through the sodium hydroxide solution, washing the mixture to be neutral after reacting for 1-2h, and drying the mixture to obtain the oxidation-modified porous hollow fiber.
Example 1: a low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 8 wt%, and then mixing calcium carbonate particles with the mass fraction of 1% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 3m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: and washing and drying the aged hollow fiber to prepare the porous hollow fiber, wherein the inner diameter of the prepared porous hollow fiber is 40 micrometers, and the outer diameter of the prepared porous hollow fiber is 110 micrometers.
Example 2: a low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing and grinding 40 wt% of bleached needle-leaf pulp and 60 wt% of bleached broad-leaf pulp, wherein the beating degree is 25 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the ton paper dosage of the porous hollow fibers is 100 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry, and uniformly mixing, wherein the dosage of each ton of cationic starch is 5kg, and the dosage of each ton of sizing agent AKD is 5 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 4 wt%, and then mixing calcium carbonate particles with the mass of 0.5 wt% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 2m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 1 wt% acetic acid solution for aging for 1h at normal temperature;
s4: and washing and drying the aged hollow fiber to prepare the porous hollow fiber, wherein the inner diameter of the prepared porous hollow fiber is 50 micrometers, and the outer diameter of the prepared porous hollow fiber is 120 micrometers.
Example 3: a low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 50 wt% of bleached needle-leaf pulp and 50 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 35 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the ton paper dosage of the porous hollow fibers is 150 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 15kg, and the dosage of each ton of sizing agent AKD is 10 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia of 10wt%, and then mixing calcium carbonate particles with the mass of 1.5wt% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 4m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 1 wt% acetic acid solution for aging for 1h at normal temperature;
s4: and washing and drying the aged hollow fiber to prepare the porous hollow fiber, wherein the inner diameter of the prepared porous hollow fiber is 35 mu m, and the outer diameter of the prepared porous hollow fiber is 90 mu m.
Example 4: (difference from example 1 in that the porous hollow fiber was modified by oxidation)
A low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 8 wt%, and then mixing calcium carbonate particles with the mass fraction of 1% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 3m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: washing and drying the aged hollow fiber to prepare the porous hollow fiber;
the porous hollow fiber is subjected to oxidation modification: adding tetramethylpiperidine nitrogen oxide and a sodium bromide aqueous solution (wherein the concentration of the tetramethylpiperidine nitrogen oxide is 0.015 wt% and the concentration of the sodium bromide is 0.02 wt%) into a 12wt% porous hollow fiber/water mixed solution, wherein the mass ratio of the porous hollow fiber/water mixed solution to the tetramethylpiperidine nitrogen oxide and the sodium bromide aqueous solution is 1:6, slowly adding sodium hypochlorite which is 0.1% of the mass of the porous hollow fiber/water mixed solution after stirring, stabilizing the pH to 10 by using the sodium hydroxide solution, reacting for 1.5h, washing with water to be neutral, and drying to obtain the oxidation modified porous hollow fiber.
Example 5: (difference from example 1 in that the porous hollow fiber was modified by oxidation)
A low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 8 wt%, and then mixing calcium carbonate particles with the mass fraction of 1% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 3m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: washing and drying the aged hollow fiber to prepare the porous hollow fiber;
the porous hollow fiber is subjected to oxidation modification: adding tetramethylpiperidine nitrogen oxide and a sodium bromide aqueous solution (wherein the concentration of the tetramethylpiperidine nitrogen oxide is 0.02 wt% and the concentration of the sodium bromide is 0.025 wt%) into a 15wt% porous hollow fiber/water mixed solution, wherein the mass ratio of the porous hollow fiber/water mixed solution to the tetramethylpiperidine nitrogen oxide and the sodium bromide aqueous solution is 1:7, slowly adding sodium hypochlorite which is 0.15% of the mass of the porous hollow fiber/water mixed solution after stirring, stabilizing the pH to 10 by using the sodium hydroxide solution, reacting for 1h, washing with water to be neutral, and drying to obtain the oxidation-modified porous hollow fiber.
Example 6: (difference from example 1 in that the porous hollow fiber was modified by oxidation)
A low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 8 wt%, and then mixing calcium carbonate particles with the mass fraction of 1% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 3m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: washing and drying the aged hollow fiber to prepare the porous hollow fiber;
the porous hollow fiber is subjected to oxidation modification: adding tetramethylpiperidine nitrogen oxide and a sodium bromide aqueous solution (wherein the concentration of the tetramethylpiperidine nitrogen oxide is 0.01 wt% and the concentration of the sodium bromide is 0.015 wt%) into a 10wt% porous hollow fiber/water mixed solution, wherein the mass ratio of the porous hollow fiber/water mixed solution to the tetramethylpiperidine nitrogen oxide and the sodium bromide aqueous solution is 1:6.5, slowly adding sodium hypochlorite which is 0.2% of the mass of the porous hollow fiber/water mixed solution after stirring, stabilizing the pH to 11 by using the sodium hydroxide solution, reacting for 1h, washing with water to be neutral, and drying to obtain the oxidation modified porous hollow fiber.
Comparative example 1: (difference from example 1 in that no porous hollow fiber was added)
A low-basis weight packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(3) and (3) dehydrating: squeezing and dewatering the slurry;
(4) drying in a drying cylinder: drying the dehydrated slurry;
(5) and (6) coiling and packaging.
Comparative example 2: (difference from example 1 in that calcium carbonate particles were not added)
(1) Pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia in a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia of 8 wt%, so as to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 3m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: and washing and drying the aged hollow fiber to prepare the porous hollow fiber.
Comparative example 3: (different from example 1 in that the inner and outer diameters of the porous hollow fiber obtained were different)
A low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 8 wt%, and then mixing calcium carbonate particles with the mass fraction of 1% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 4m/min through a coaxial spinning head with the outer diameter of 0.6mm and the inner diameter of 0.4mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: and washing and drying the aged hollow fiber to prepare the porous hollow fiber, wherein the inner diameter of the prepared porous hollow fiber is 20 micrometers, and the outer diameter of the prepared porous hollow fiber is 60 micrometers.
Comparative example 4: (different from example 1 in that the inner and outer diameters of the porous hollow fiber obtained were different)
A low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 8 wt%, and then mixing calcium carbonate particles with the mass fraction of 1% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 3m/min through a coaxial spinning head with the outer diameter of 1mm and the inner diameter of 0.8mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: and washing and drying the aged hollow fiber to prepare the porous hollow fiber, wherein the inner diameter of the prepared porous hollow fiber is 80 micrometers, and the outer diameter of the prepared porous hollow fiber is 170 micrometers.
Comparative example 5: (different from example 4 in the amount of sodium hypochlorite used when the porous hollow fiber was modified by oxidation)
A low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 8 wt%, and then mixing calcium carbonate particles with the mass fraction of 1% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 3m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: washing and drying the aged hollow fiber to prepare the porous hollow fiber;
the porous hollow fiber is subjected to oxidation modification: adding tetramethylpiperidine nitrogen oxide and a sodium bromide aqueous solution (wherein the concentration of the tetramethylpiperidine nitrogen oxide is 0.015 wt% and the concentration of the sodium bromide is 0.02 wt%) into a 12wt% porous hollow fiber/water mixed solution, wherein the mass ratio of the porous hollow fiber/water mixed solution to the tetramethylpiperidine nitrogen oxide and the sodium bromide aqueous solution is 1:6, slowly adding sodium hypochlorite which is 0.05% of the mass of the porous hollow fiber/water mixed solution after stirring, stabilizing the pH to 10 by using the sodium hydroxide solution, reacting for 1.5h, washing with water to be neutral, and drying to obtain the oxidation modified porous hollow fiber.
Comparative example 6: (different from example 4 in the amount of sodium hypochlorite used when the porous hollow fiber was modified by oxidation)
A low-basis weight high-permeability packaging base paper and a preparation method thereof comprise the following preparation steps:
(1) pulping: mixing 30 wt% of bleached needle-leaf pulp and 70 wt% of bleached broad-leaf pulp, and grinding to obtain pulp with a beating degree of 30 DEG SR;
(2) fiber addition: adding the porous hollow fibers into the slurry, and uniformly mixing, wherein the dosage of each ton of paper of the porous hollow fibers is 120 kg;
(3) addition of an auxiliary agent: adding cationic starch and a sizing agent AKD into the slurry and uniformly mixing, wherein the dosage of each ton of cationic starch is 10kg, and the dosage of each ton of sizing agent AKD is 7 kg;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) coiling and packaging;
the preparation method of the porous hollow fiber comprises the following steps:
s1: placing the fibrilia into a sodium hydroxide/urea/water mixed solution (wherein the sodium hydroxide content is 7wt%, and the urea content is 12 wt%) to prepare a mixed solution with the mass fraction of the fibrilia being 8 wt%, and then mixing calcium carbonate particles with the mass fraction of 1% of the sodium hydroxide/urea/water mixed solution to obtain a spinning pre-solution;
s2: taking 20 wt% acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath at a flow rate of 3m/min through a coaxial spinning head with an outer diameter of 0.8mm and an inner diameter of 0.6mm, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber into 2wt% acetic acid solution for aging for 0.5h at normal temperature;
s4: washing and drying the aged hollow fiber to prepare the porous hollow fiber;
the porous hollow fiber is subjected to oxidation modification: adding tetramethylpiperidine nitrogen oxide and a sodium bromide aqueous solution (wherein the concentration of the tetramethylpiperidine nitrogen oxide is 0.015 wt% and the concentration of the sodium bromide is 0.02 wt%) into a 12wt% porous hollow fiber/water mixed solution, wherein the mass ratio of the porous hollow fiber/water mixed solution to the tetramethylpiperidine nitrogen oxide and the sodium bromide aqueous solution is 1:6, slowly adding sodium hypochlorite which is 0.3% of the mass of the porous hollow fiber/water mixed solution after stirring, stabilizing the pH to 10 by using the sodium hydroxide solution, reacting for 1.5h, washing with water to be neutral, and drying to obtain the oxidation modified porous hollow fiber.
The packaging base papers prepared in the examples and comparative examples were subjected to property characterization, and the data are shown in the following table.
As can be seen from the above data, the low basis weight packaging base paper prepared in this example has better air permeability and strength than the low basis weight packaging base paper without using porous hollow fibers (comparative examples 1 and 2), and the paper has no holes, and when the inner and outer diameters of the prepared porous hollow fibers exceed the limited range (comparative examples 3 and 4), high air permeability and strength cannot be satisfied at the same time under the low basis weight condition.
From the data, it can be seen that the wet strength of the packaging base paper can be remarkably improved by preparing the packaging base paper from the multi-hollow air fiber subjected to the oxidation modification treatment.
The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. A preparation method of low-basis weight high-permeability packaging base paper is characterized by comprising the following preparation steps:
(1) pulping: mixing the bleached needle-leaf pulp and the bleached broad-leaf pulp and grinding into thick liquid;
(2) fiber addition: adding the porous hollow fiber into the slurry and uniformly mixing;
(3) addition of an auxiliary agent: adding the internal sizing agent and the sizing agent into the sizing agent and uniformly mixing;
(4) and (3) dehydrating: squeezing and dewatering the slurry;
(5) drying in a drying cylinder: drying the dehydrated slurry;
(6) and (6) coiling and packaging.
2. The preparation method of the low-basis-weight high-permeability packaging base paper according to claim 1, characterized in that the mass ratio of the bleached needle pulp to the bleached broad-leaved pulp in step (1) is 3-5:5-7, and the beating degree is 25-35 ° SR.
3. The method for preparing a packaging base paper with low basis weight and high air permeability as claimed in claim 1, wherein the amount of the porous hollow fibers per ton in step (2) is 100-150 kg.
4. The method for preparing packaging base paper with low basis weight and high air permeability as claimed in claim 1, wherein the method for preparing the porous hollow fiber in step (2) comprises the following steps:
s1: placing the fibrilia into the dispersion liquid, and then mixing the fibrilia into calcium carbonate particles to obtain spinning pre-liquid;
s2: taking an acetone solution as a coagulating bath and a spinning core layer solution, injecting the spinning preflush and the spinning core layer solution into the coagulating bath through a coaxial spinning head, and carrying out wet spinning to obtain a hollow fiber;
s3: putting the hollow fiber in an acetic acid solution for normal-temperature aging;
s4: and washing and drying the aged hollow fiber to prepare the porous hollow fiber.
5. The method for preparing packaging base paper with low basis weight and high air permeability as claimed in claim 4, wherein the dispersion liquid in step S1 is a mixed solution of sodium hydroxide/urea/water, wherein the sodium hydroxide content is 7wt% and the urea content is 12 wt%.
6. The method for preparing packaging base paper with low basis weight and high air permeability as claimed in claim 4, wherein the mass fraction of the fibrilia in step S1 is 4-10wt%, and the addition amount of the calcium carbonate particles is 0.5-1.5wt% of the mass of the dispersion.
7. The method for preparing packaging base paper with low basis weight and high air permeability as claimed in claim 4, wherein the concentration of the acetic acid solution in step S3 is 1-2 wt%.
8. The method for preparing the packaging base paper with low basis weight and high air permeability as claimed in claim 1, wherein the size gum in step (3) is cationic starch, and the dosage of the paper per ton is 5-15 kg.
9. The method for preparing the packaging base paper with low basis weight and high air permeability as claimed in claim 1, wherein the sizing agent in step (3) is AKD, and the dosage of each ton of paper is 5-10 kg.
10. The method for preparing a packaging base paper with low basis weight and high air permeability according to any one of claims 4 to 7, wherein the porous hollow fibers are subjected to oxidation modification: adding tetramethylpiperidine nitrogen oxide and a sodium bromide aqueous solution into a 10-15wt% porous hollow fiber/water mixed solution, stirring, slowly adding sodium hypochlorite with the mass of 0.1-0.2% relative to the mass of the porous hollow fiber/water mixed solution, stabilizing the pH to 10-11 by using a sodium hydroxide solution, reacting for 1-2h, washing with water to be neutral, and drying to obtain the oxidation modified porous hollow fiber.
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