CN113818279A - Processing method for remarkably improving moisture resistance of corrugated paper - Google Patents
Processing method for remarkably improving moisture resistance of corrugated paper Download PDFInfo
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- CN113818279A CN113818279A CN202111088698.3A CN202111088698A CN113818279A CN 113818279 A CN113818279 A CN 113818279A CN 202111088698 A CN202111088698 A CN 202111088698A CN 113818279 A CN113818279 A CN 113818279A
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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
- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B82—NANOTECHNOLOGY
- B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
- B82Y40/00—Manufacture or treatment of nanostructures
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G41/00—Compounds of tungsten
- C01G41/02—Oxides; Hydroxides
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/18—Shaking apparatus for wire-cloths and associated parts
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/20—Particle morphology extending in two dimensions, e.g. plate-like
- C01P2004/24—Nanoplates, i.e. plate-like particles with a thickness from 1-100 nanometer
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Abstract
The invention discloses a processing method for remarkably improving the moisture resistance of corrugated paper, which relates to the technical field of corrugated paper processing, and comprises the following specific processes: s1, grinding tin dichloride and p-toluenesulfonic acid; s2, grinding potassium tetrahydroborate and p-toluenesulfonic acid; s3, mixing and grinding the products obtained in the step S1 and the step S2, placing the ground products and potassium chloride in a tube furnace, and annealing to obtain nano particles; s4, grinding the fibers into pulp, and adding the pulp and the nano particles into a pulp preparation tank to prepare preliminarily formed corrugated paper; and S5, carrying out retreatment on the preliminarily formed corrugated paper to finish the processing technology of the corrugated paper. The corrugated paper processing technology provided by the invention can effectively reduce the glue failure phenomenon of the corrugated paper surface sizing agent, thereby enhancing the moisture resistance and strength of the corrugated paper.
Description
Technical Field
The invention belongs to the technical field of corrugated paper processing, and particularly relates to a processing method for remarkably improving the moisture resistance of corrugated paper.
Background
The carton as a common packaging material is widely applied all over the world for a long time, and along with the development of economy and the gradual improvement of living standard, higher quality requirements are also put forward on the packaging material. It is desirable for the carton to be stronger, maintain high strength particularly in wet environments, and be lighter without changing strength, so that the product can be stored more safely and handled more easily.
Because of the development trend of the carton industry, higher quality requirements are also provided for the base paper, and the corrugated base paper is especially suitable for the customers, and in order to meet the higher requirements of the customers, the majority of paper makers of corrugated paper manufacturers begin to apply the surface sizing technology which is widely applied in civilization to the corrugated paper. The surface sizing of the corrugated paper is to obtain higher ring crush strength and better water and moisture resistance. The ring crush strength value after surface sizing can be greatly improved, generally by 30-50%; if the used waste paper raw material is poor, the ring crush strength can be improved by even 100% after surface sizing, and the effect is difficult to achieve by adding any auxiliary agent into the pulp. After the sizing agent with water resistance and moisture resistance is added into the glue solution, the water resistance and the moisture resistance of the corrugated paper can be greatly improved, and the cost of using the sizing agent in the glue solution is often doubled or even multiplied to achieve the same effect. Consequently, in the manufacturing process of corrugated paper, through carrying out the gluey to the corrugated paper surface, can effectual ring crush strength and the moisture resistance of improvement corrugated paper, however, in prior art, carry out the gluey to the corrugated paper surface, there is the problem of easily opening the glue in process of production, not only is unfavorable for the promotion of corrugated paper moisture resistance, makes the quality of corrugated paper reduce on the contrary.
Disclosure of Invention
The invention aims to provide a processing method for remarkably improving the moisture resistance of corrugated paper aiming at the technical defect that a corrugated paper surface sizing agent in the prior art is easy to split, so that glue applied on the surface of the corrugated paper is not easy to split, and the moisture resistance and the strength of the corrugated paper are improved.
The invention is realized by the following technical scheme:
a processing method for remarkably improving the moisture resistance of corrugated paper comprises the following specific process steps:
s1, weighing a proper amount of tin dichloride, putting the tin dichloride into a mortar, grinding for 20-30min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 15-25min, mixing the ground tin dichloride and the p-toluenesulfonic acid according to a mass ratio of 3-3.5:5, and then putting the mixture into the mortar, grinding for 5-10min for later use;
s2, weighing a proper amount of potassium tetrahydroborate, putting the potassium tetrahydroborate into a mortar, grinding for 20-30min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 15-25min, mixing the ground sodium borohydride and the p-toluenesulfonic acid according to a mass ratio of 1.3-1.6:5, and then putting the mixture into the mortar, grinding for 5-10min for later use;
s3, mixing and grinding the products obtained in the steps S1 and S2 for 20-45min according to the mass ratio of tin dichloride to sodium borohydride being 2.0-2.3:1, placing the mixture in air for 12-15h, repeatedly washing the obtained mixed powder with alcohol and distilled water respectively, drying the washed mixed powder, mixing and grinding the dried mixed powder with potassium chloride according to the mass ratio of 1:4-4.3, placing the mixed powder in a tubular furnace, and annealing the mixed powder for 3-4h at the temperature of 800-; according to the invention, a room temperature solid phase reaction method is utilized to synthesize a tin dioxide nanoparticle precursor, a molten salt medium potassium chloride is selected, the precursor is annealed at high temperature, the precursor nanoparticles can grow in a self-assembly manner, the nanoparticles are converted into nanorods, and in the space structure of the nanorods, one long nanorod is presented, the length of the nanorod is increased to a millimeter level, five and six short nanorods are supported, so that the space structure of the nanorods presents an obtuse angle V-shaped nanostructure, namely five and six branched short nanorods are self-grown on one long nanorod, by adding the nanoparticles into slurry, the V-shaped nanostructure presented in the nanoparticles is just like branches and can be wound with fibers in the slurry, and the nanoparticles are taken as a cross-connection point, so that the winding structure of the fibers can be more stable;
s4, grinding fibers into pulp, adding the pulp and the nanoparticles into a pulp preparation pool together for mixing, controlling the nanoparticles to account for 3.2-4.6% of the total mass of the pulp, controlling the beating degree of the pulp to be 40-50 DEG SR, obtaining the pulp, conveying the obtained pulp to a net part forming system for dehydration, and then forming, squeezing and drying through a net part to obtain preliminarily formed corrugated paper; in the invention, the prepared nanoparticles with special forms are introduced into the corrugated paper, the V-shaped nanostructures presented in the nanoparticles are like branches and can be wound with fibers in the slurry, and the winding structure of the fibers in the corrugated paper is more stable, so that the fiber structure in the corrugated paper is not easy to deform under the high-temperature drying condition, after the surface sizing of the corrugated paper is carried out, the glue layer is not subjected to glue splitting caused by the self-generated deformation of the corrugated paper in the drying and curing process of the corrugated paper, and the nanoparticles introduced into the corrugated paper are wound and attached on the fibers, so that a nanoparticle layer is formed on the surface of the corrugated paper and randomly distributed on the surface of the corrugated paper, numerous randomly distributed nanorod branches are presented on the surface of the corrugated paper, and the formed nanorod branches take the corrugated paper as a matrix and are crossed with each other, the nano particle layer with the hollowed appearance formed by the nano rod branches is constructed on the surface of the corrugated paper, when glue is applied to the surface of the corrugated paper, the nano particle layer with the hollowed appearance can be embedded into the glue layer, and a continuous-phase branch interweaving structure is formed in the glue layer, so that the stress action in the glue layer can be effectively relieved and absorbed, and the glue layer is not easy to split;
s5, placing the weighed sodium tungstate dihydrate into a container according to the mass-to-volume ratio of 3-5:100g/mL, adding 30-35% of alcohol solution, adjusting the pH value to 1.5-1.8 by using 95-98% of concentrated sulfuric acid, transferring the obtained mixed solution into a reaction kettle with a polytetrafluoroethylene lining, placing the primarily formed corrugated paper into the mixed solution, sealing the reaction kettle, reacting at 93-98 ℃ for 7-10h, cooling to room temperature, taking out the corrugated paper, repeatedly washing with distilled water and alcohol, and drying at 60-70 ℃ for 20-25h to complete the corrugated paper processing process; according to the method, alcohol is used as an inducer, a low-temperature hydrothermal synthesis method is utilized, inorganic tungsten trioxide nanosheets are self-grown in situ on the surface of corrugated paper, the formed tungsten trioxide nanosheets are attached to a nanoparticle layer with a hollowed-out shape on the surface of the corrugated paper, the friction coefficient between a surface sizing agent and the nanoparticle layer can be effectively reduced through the formed nanosheets, the surface sizing agent can easily penetrate through hollowed-out holes in the nanoparticles and is filled in the holes, the surface sizing agent can be in direct contact with the corrugated paper, and therefore the phenomenon that the surface sizing agent cannot be in contact with the corrugated paper due to the fact that a large amount of surface sizing agent is accumulated in the nanoparticle layer due to high surface viscosity is avoided.
Further, the wire section forming is performed in a wire section forming system, the equipment of which comprises a breast roll shaker and a gravity dewatering box; the breast roll shaker generates vibration in the banner direction, the frequency of the vibration is 5-10Hz, and the amplitude is 5-10 mm; the gravity dewatering box is provided with a ceramic water scraping strip with adjustable angle and height, the water scraping angle of the ceramic water scraping strip is-5-5 degrees, and the water scraping height of the ceramic water scraping strip is 1-4 mm.
Compared with the prior art, the invention has the following advantages:
the corrugated paper processing technology provided by the invention introduces the prepared nanoparticles with special forms into the corrugated paper, the V-shaped nanostructures presented in the nanoparticles are like branches and can be wound with fibers in the corrugated paper, so that a layer of nanoparticle layer is formed on the surface of the corrugated paper, countless nanorod branches are randomly distributed on the surface of the corrugated paper, the formed nanorod branches are mutually crossed by taking the corrugated paper as a substrate, present a nanorod branch layer and present a hollowed-out shape internally, and meanwhile, in order to prevent the nanorod branch layer with larger surface viscosity and difficult to permeate the hollowed-out shape of the corrugated paper surface, the invention self-grows inorganic tungsten trioxide nanosheets on the surface of the corrugated paper in situ, the tungsten trioxide formed by the nanosheets is attached to the hollowed-out shape nanoparticle layer on the surface of the corrugated paper, and the friction coefficient between the surface sizing agent and the nanoparticle layer can be effectively reduced, the surface sizing agent is enabled to more easily penetrate through the hollowed-out holes in the nano particles and be filled in the holes, the surface sizing agent is prevented from being accumulated on the surface of the nano particle layer in a large amount, the phenomenon that the nano particle layer with the hollowed-out appearance exists between corrugated paper and the surface sizing agent is enabled to occur, the nano particle layer with the hollowed-out appearance has a low friction coefficient, the surface sizing agent can easily penetrate through the hollowed-out holes and is filled in the holes, the nano particle layer with the hollowed-out appearance is enabled to be completely embedded into a glue layer, a continuous-phase nanorod branch interweaving structure is formed inside the glue layer, the formed interweaving structure plays a good stabilizing role in the glue layer, the stress action in the glue layer can be effectively relieved and absorbed, the glue layer is enabled to be not prone to generate the phenomenon of glue failure, and the moisture resistance and the strength of the corrugated paper are improved.
Detailed Description
The present invention will be further described with reference to specific embodiments.
Example 1
A processing method for remarkably improving the moisture resistance of corrugated paper comprises the following specific process steps:
s1, weighing a proper amount of tin dichloride, putting the tin dichloride into a mortar, grinding for 20min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 10min, mixing the ground tin dichloride and the p-toluenesulfonic acid according to a mass ratio of 3:5, and then putting the mixture into the mortar, grinding for 10min for later use;
s2, weighing a proper amount of potassium tetrahydroborate, putting the potassium tetrahydroborate into a mortar, grinding for 20min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 10min, mixing the ground sodium borohydride and the p-toluenesulfonic acid according to the mass ratio of 1.3:5, and then putting the mixture into the mortar, grinding for 10min for later use;
s3, mixing and grinding products obtained in the step S1 and the step S2 for 30min according to the mass ratio of tin dichloride to sodium borohydride being 2.0:1, placing the mixture in air for 12h, repeatedly washing obtained mixed powder with alcohol and distilled water respectively, drying the mixed powder, mixing and grinding the dried mixed powder with potassium chloride according to the mass ratio of 1:4, placing the mixed powder in a tubular furnace, and annealing the mixed powder at 800 ℃ for 3h to obtain nano particles;
s4, separately grinding the short fibers obtained through classified screening, the medium fibers obtained through first-stage fine screening and the long fibers obtained through second-stage fine screening into pulp, then weighing three types of fibers according to the mass ratio of 1:1:1, adding the three types of fibers and the nanoparticles into a pulp preparation pool together for mixing, controlling the nanoparticles to account for 3.2% of the total mass of the pulp, controlling the beating degree of the pulp to be 40-degree SR, obtaining the pulp, conveying the obtained pulp to a net part forming system for dewatering, and then forming, squeezing and drying through a net part to obtain primary formed corrugated paper;
the vibration of the breast roll shaking device with the frequency of 5Hz and the amplitude of 10mm is generated in the banner direction, the water scraping angle of the water scraping strip of the gravity dewatering box is set to be 0 degree, and the water scraping height of the ceramic water scraping strip is 2 mm;
s5, placing the weighed sodium tungstate dihydrate into a container according to the mass-to-volume ratio of 3:100g/mL, adding 30% by mass of an alcohol solution, adjusting the pH value to 1.5 by using 95% by mass of concentrated sulfuric acid, transferring the obtained mixed solution into a reaction kettle with a polytetrafluoroethylene lining, placing the preliminarily formed corrugated paper into the mixed solution, sealing the reaction kettle, reacting for 7 hours at 93 ℃, cooling to room temperature, taking out the corrugated paper, repeatedly washing with distilled water and alcohol, and drying for 20 hours at 60 ℃ to complete the corrugated paper processing technology.
Comparative example 1: process step s5 is removed and the rest is the same as in example 1.
Comparative example 2: replacing the step S4, grinding the short fibers obtained by classification screening, the middle fibers obtained by primary fine screening and the long fibers obtained by secondary fine screening separately, then weighing three fibers according to the mass ratio of 1:1:1, adding the three fibers into a pulp mixing pool for mixing, controlling the beating degree of the pulp to be 40 DEG SR, obtaining pulp, conveying the obtained pulp to a net part forming system for dewatering, then forming, squeezing and drying the pulp through the net part, obtaining primary formed corrugated paper, then immersing the corrugated paper into nano-particle ultrapure water dispersion liquid with the solid content of 3.2%, vacuumizing to 20Pa, and carrying out vacuum treatment for 1h, wherein the rest steps are the same as those in the embodiment 1.
Control group: separately grinding short fibers obtained through classified screening, medium fibers obtained through first-stage fine screening and long fibers obtained through second-stage fine screening into pulp, then weighing the three fibers according to the mass ratio of 1:1:1, adding the three fibers into a pulp preparation tank for mixing, controlling the beating degree of pulp to be 40 DEG SR, obtaining pulp, conveying the obtained pulp to a net part forming system for dewatering, and then forming, squeezing and drying the pulp through a net part to obtain corrugated paper.
Test experiments
Adding a surface sizing agent into a surface sizing feeding tank, adding a surface moisture-proof agent into a starch sizing storage tank, performing surface sizing on the corrugated paper provided by the embodiment 1, the comparative examples 1-2 and the control group, then placing the corrugated paper into a drying cylinder, keeping the temperature at 130 ℃, keeping the water content at 5%, and standing the corrugated paper at room temperature for 24 hours to obtain the moisture-proof corrugated paper, wherein the surface sizing agent is a styrene-acrylic surface sizing agent, the addition amount of the surface sizing agent is 5 kg/ton (finished paper), the surface moisture-proof agent is a cationic surface moisture-proof agent, and the addition amount of the surface moisture-proof agent is 3 kg/ton (finished paper); drying the moisture-proof corrugated paper at 120 ℃ for 3min, and carrying out water absorption test on the obtained moisture-proof corrugated paper, wherein the results are as follows: the moisture-proof corrugated paper of example 1 had a water absorption of 20 gsm; the moisture-resistant corrugated paper of comparative example 1, having a water absorption of 52 gsm; the moisture-resistant corrugated paper of comparative example 2, having a water absorption of 35 gsm; the moisture-proof corrugated paper of the control group has the water absorption of 86 gsm; in addition, the glue layer in the embodiment 1 has no damage and crack; the glue layer of comparative example 1 was unbroken and had small cracks; the glue layer of comparative example 2 was unbroken with a small number of fine cracks; the glue layer of the control group is damaged; meanwhile, the ring crush index (n.m/g) of each moisture-proof corrugated paper was measured by CT300A compression strength tester of automated technology limited of yogzhou sutong bock, and the results were as follows: the ring crush index of the corrugated paper of example 1 is increased by 23.5% relative to the control; the ring crush index of the corrugated paper of comparative example 1 is increased by 5.6%; the ring crush index of the corrugated paper of comparative example 2 increased by 13.8%.
Example 2
A processing method for remarkably improving the moisture resistance of corrugated paper comprises the following specific process steps:
s1, weighing a proper amount of tin dichloride, putting the tin dichloride into a mortar, grinding for 25min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 15min, mixing the ground tin dichloride and the p-toluenesulfonic acid according to a mass ratio of 3.2:5, and then putting the mixture into the mortar, grinding for 12min for later use;
s2, weighing a proper amount of potassium tetrahydroborate, putting the potassium tetrahydroborate into a mortar, grinding for 25min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 15min, mixing the ground sodium borohydride and the p-toluenesulfonic acid according to a mass ratio of 1.5:5, and then putting the mixture into the mortar, grinding for 12min for later use;
s3, mixing and grinding products obtained in the step S1 and the step S2 for 35min according to the mass ratio of tin dichloride to sodium borohydride being 2.1:1, placing the mixture in air for 13h, repeatedly washing obtained mixed powder with alcohol and distilled water respectively, drying the mixed powder, mixing and grinding the dried mixed powder with potassium chloride according to the mass ratio of 1:4.2, placing the mixed powder in a tubular furnace, and annealing the mixed powder at 830 ℃ for 3.5h to obtain nano particles;
s4, separately grinding the short fibers obtained through classified screening, the medium fibers obtained through first-stage fine screening and the long fibers obtained through second-stage fine screening into pulp, then weighing three types of fibers according to the mass ratio of 1:1:1, adding the three types of fibers and the nanoparticles into a pulp preparation pool together for mixing, controlling the nanoparticles to account for 3.8% of the total mass of the pulp, controlling the beating degree of the pulp to be 45-degree SR, obtaining the pulp, conveying the obtained pulp to a net part forming system for dewatering, and then forming, squeezing and drying through a net part to obtain primary formed corrugated paper;
the vibration of the breast roll shaking device with the frequency of 10Hz and the amplitude of 15mm is generated in the banner direction, the water scraping angle of the water scraping strip of the gravity dewatering box is set to be 5 degrees, and the water scraping height of the ceramic water scraping strip is 2 mm;
s5, placing the weighed sodium tungstate dihydrate into a container according to a mass-to-volume ratio of 4:100g/mL, adding an alcohol solution with the mass fraction of 32%, then adjusting the pH value to 1.6 by using concentrated sulfuric acid with the mass fraction of 95-98%, transferring the obtained mixed solution into a reaction kettle with a polytetrafluoroethylene lining, placing the preliminarily formed corrugated paper into the mixed solution, sealing the reaction kettle, reacting for 8 hours at 95 ℃, cooling to room temperature, taking out the corrugated paper, repeatedly washing with distilled water and alcohol, and drying for 23 hours at 65 ℃, thus finishing the processing technology of the corrugated paper.
Comparative example 1: the process step s5 is eliminated, and the rest is the same as in example 2.
Comparative example 2: replacing the step S4, grinding the short fibers obtained by classification screening, the middle fibers obtained by primary fine screening and the long fibers obtained by secondary fine screening separately, then weighing three fibers according to the mass ratio of 1:1:1, adding the three fibers into a pulp mixing pool for mixing, controlling the beating degree of the pulp to be 45 DEG SR, obtaining pulp, conveying the obtained pulp to a net part forming system for dewatering, then forming, squeezing and drying the pulp through the net part, obtaining primary formed corrugated paper, then immersing the corrugated paper into nano-particle ultrapure water dispersion liquid with the solid content of 3.8%, vacuumizing to 20Pa, and carrying out vacuum treatment for 1h, wherein the rest steps are the same as those in the embodiment 2.
Control group: separately grinding short fibers obtained through classified screening, medium fibers obtained through first-stage fine screening and long fibers obtained through second-stage fine screening into pulp, then weighing the three fibers according to the mass ratio of 1:1:1, adding the three fibers into a pulp preparation tank for mixing, controlling the beating degree of pulp to be 45 DEG SR, obtaining pulp, conveying the obtained pulp to a net part forming system for dewatering, and then forming, squeezing and drying the pulp through a net part to obtain corrugated paper.
Test experiments
Adding a surface sizing agent into a surface sizing feeding tank, adding a surface moisture-proof agent into a starch sizing storage tank, performing surface sizing on the corrugated paper provided by the embodiment 2, the comparative examples 1-2 and the control group, then placing the corrugated paper into a drying cylinder, keeping the temperature at 130 ℃, keeping the water content at 5%, and standing the corrugated paper at room temperature for 24 hours to obtain the moisture-proof corrugated paper, wherein the surface sizing agent is a styrene-acrylic surface sizing agent, the addition amount of the surface sizing agent is 5 kg/ton (finished paper), the surface moisture-proof agent is a cationic surface moisture-proof agent, and the addition amount of the surface moisture-proof agent is 3 kg/ton (finished paper); drying the moisture-proof corrugated paper at 120 ℃ for 3min, and carrying out water absorption test on the obtained moisture-proof corrugated paper, wherein the results are as follows: the moisture-proof corrugated paper of example 2 had a water absorption of 25 gsm; the moisture-resistant corrugated paper of comparative example 1, having a water absorption of 60 gsm; the moisture-resistant corrugated paper of comparative example 2, having a water absorption of 39 gsm; the moisture-proof corrugated paper of the control group has the water absorption of 86 gsm; in addition, the glue layer in the embodiment 2 has no damage and crack; the glue layer of comparative example 1 was unbroken and had small cracks; the glue layer of comparative example 2 was unbroken with a small number of fine cracks; the glue layer of the control group is damaged; meanwhile, the ring crush index (n.m/g) of each moisture-proof corrugated paper was measured by CT300A compression strength tester of automated technology limited of yogzhou sutong bock, and the results were as follows: the ring crush index of the corrugated paper of example 2 is increased by 21.4% relative to the control; the ring crush index of the corrugated paper of comparative example 1 is increased by 4.7%; the ring crush index of the corrugated paper of comparative example 2 increased by 12.6%.
Example 3
A processing method for remarkably improving the moisture resistance of corrugated paper comprises the following specific process steps:
s1, weighing a proper amount of tin dichloride, putting the tin dichloride into a mortar, grinding for 30min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 20min, mixing the ground tin dichloride and the p-toluenesulfonic acid according to a mass ratio of 3.5:5, and then putting the mixture into the mortar, grinding for 15min for later use;
s2, weighing a proper amount of potassium tetrahydroborate, putting the potassium tetrahydroborate into a mortar, grinding for 30min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 20min, mixing the ground sodium borohydride and the p-toluenesulfonic acid according to the mass ratio of 1.6:5, and then putting the mixture into the mortar, grinding for 15min for later use;
s3, mixing and grinding products obtained in the step S1 and the step S2 for 40min according to the mass ratio of tin dichloride to sodium borohydride being 2.3:1, placing the mixture in air for 15h, repeatedly washing obtained mixed powder with alcohol and distilled water respectively, drying the mixed powder, mixing and grinding the dried mixed powder with potassium chloride according to the mass ratio of 1:4.3, placing the mixed powder in a tubular furnace, and annealing the mixed powder at 850 ℃ for 4h to obtain nano particles;
s4, separately grinding the short fibers obtained through classified screening, the medium fibers obtained through first-stage fine screening and the long fibers obtained through second-stage fine screening into pulp, then weighing three types of fibers according to the mass ratio of 1:1:1, adding the three types of fibers and the nanoparticles into a pulp preparation pool together for mixing, controlling the nanoparticles to account for 4.6% of the total mass of the pulp, controlling the beating degree of the pulp to be 50-degree SR, obtaining the pulp, conveying the obtained pulp to a net part forming system for dewatering, and then forming, squeezing and drying through a net part to obtain primary formed corrugated paper;
the vibration of the breast roll shaking device with the frequency of 10Hz and the amplitude of 15mm is generated in the banner direction, the water scraping angle of the water scraping strip of the gravity dewatering box is set to be 5 degrees, and the water scraping height of the ceramic water scraping strip is 4 mm;
s5, placing the weighed sodium tungstate dihydrate into a container according to a mass-to-volume ratio of 5:100g/mL, adding an alcohol solution with the mass fraction of 35%, then adjusting the pH value to 1.8 by using concentrated sulfuric acid with the mass fraction of 95-98%, transferring the obtained mixed solution into a reaction kettle with a polytetrafluoroethylene lining, placing the preliminarily formed corrugated paper into the mixed solution, sealing the reaction kettle, reacting for 10 hours at 98 ℃, cooling to room temperature, taking out the corrugated paper, repeatedly washing with distilled water and alcohol, and drying for 25 hours at 70 ℃, thus finishing the processing technology of the corrugated paper.
Comparative example 1: the process step s5 is eliminated, and the rest is the same as in example 3.
Comparative example 2: replacing the step S4, grinding the short fibers obtained by classification screening, the middle fibers obtained by primary fine screening and the long fibers obtained by secondary fine screening separately, then weighing the three fibers according to the mass ratio of 1:1:1, adding the three fibers into a pulp mixing pool for mixing, controlling the beating degree of the pulp to be 50 DEG SR, obtaining pulp, conveying the obtained pulp to a net part forming system for dewatering, then forming, squeezing and drying the pulp through a net part, obtaining primary formed corrugated paper, then immersing the corrugated paper into nano-particle ultrapure water dispersion liquid with the solid content of 4.6%, vacuumizing to 20Pa, and carrying out vacuum treatment for 1h, wherein the rest steps are the same as those in the embodiment 3.
Control group: separately grinding short fibers obtained through classified screening, medium fibers obtained through first-stage fine screening and long fibers obtained through second-stage fine screening into pulp, then weighing the three fibers according to the mass ratio of 1:1:1, adding the three fibers into a pulp preparation tank for mixing, controlling the beating degree of the pulp to be 50-degree SR to obtain pulp, conveying the obtained pulp to a net part forming system for dewatering, and then forming, squeezing and drying the pulp through a net part to obtain corrugated paper.
Test experiments
Adding a surface sizing agent into a surface sizing feeding tank, adding a surface moisture-proof agent into a starch size storage tank, performing surface sizing on the corrugated paper provided by the embodiment 3, the comparative examples 1-2 and the control group, then placing the corrugated paper into a drying cylinder, keeping the temperature at 130 ℃, keeping the water content at 5%, and standing the corrugated paper at room temperature for 24 hours to obtain the moisture-proof corrugated paper, wherein the surface sizing agent is a styrene-acrylic surface sizing agent, the addition amount of the surface sizing agent is 5 kg/ton (finished paper), the surface moisture-proof agent is a cationic surface moisture-proof agent, and the addition amount of the surface moisture-proof agent is 3 kg/ton (finished paper); drying the moisture-proof corrugated paper at 120 ℃ for 3min, and carrying out water absorption test on the obtained moisture-proof corrugated paper, wherein the results are as follows: the moisture-proof corrugated paper of example 3 had a water absorption of 23 gsm; the moisture-resistant corrugated paper of comparative example 1, having a water absorption of 58 gsm; the moisture-resistant corrugated paper of comparative example 2, having a water absorption of 37 gsm; the moisture-proof corrugated paper of the control group has the water absorption of 87 gsm; in addition, the glue layer in the embodiment 3 has no damage and crack; the glue layer of comparative example 1 was unbroken and had small cracks; the glue layer of comparative example 2 was unbroken with a small number of fine cracks; the glue layer of the control group is damaged; meanwhile, the ring crush index (n.m/g) of each moisture-proof corrugated paper was measured by CT300A compression strength tester of automated technology limited of yogzhou sutong bock, and the results were as follows: the ring crush index of the corrugated paper of example 3 is increased by 22.1% relative to the control; the ring crush index of the corrugated paper of comparative example 1 is increased by 5.2%; the ring crush index of the corrugated paper of comparative example 2 increased by 13.3%.
According to the test results, the corrugated paper processing technology provided by the invention can effectively reduce the glue failure phenomenon of the corrugated paper surface sizing agent, so that the moisture resistance and the strength of the corrugated paper are enhanced.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that are not thought of through the inventive work should be included in the scope of the present invention.
Claims (6)
1. A processing method for remarkably improving the moisture resistance of corrugated paper is characterized by comprising the following specific process steps:
s1, weighing a proper amount of tin dichloride, putting the tin dichloride into a mortar, grinding for 20-30min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 15-25min, mixing the ground tin dichloride and the p-toluenesulfonic acid, and then putting the mixture into the mortar, grinding for 5-10min for later use;
s2, weighing a proper amount of potassium tetrahydroborate, putting the potassium tetrahydroborate into a mortar, grinding for 20-30min, weighing a proper amount of p-toluenesulfonic acid, putting the p-toluenesulfonic acid into the mortar, grinding for 15-25min, mixing the ground sodium borohydride and the p-toluenesulfonic acid, and then putting the mixture into the mortar, grinding for 5-10min for later use;
s3, mixing and grinding the products obtained in the steps S1 and S2 for 20-45min, placing in the air for 12-15h, respectively washing the obtained mixed powder repeatedly with alcohol and distilled water, drying, mixing and grinding the dried mixed powder with a proper amount of potassium chloride, placing in a tube furnace, and annealing at 800-850 ℃ for 3-4h to obtain nano particles;
s4, grinding fibers into pulp, adding the pulp and the nanoparticles into a pulp preparation pool for mixing, controlling the beating degree of the pulp to be 40-50 DEG SR, obtaining pulp, conveying the obtained pulp to a net part forming system for dehydration, and then forming, squeezing and drying the pulp through a net part to obtain primary formed corrugated paper;
s5, weighing a proper amount of sodium tungstate dihydrate, placing the sodium tungstate dihydrate into a container, adding a proper amount of alcohol solution, then adjusting the pH value to 1.5-1.8 by using concentrated sulfuric acid, transferring the obtained mixed solution into a reaction kettle with a polytetrafluoroethylene lining, placing the preliminarily formed corrugated paper into the mixed solution, sealing the reaction kettle, reacting for 7-10h at 93-98 ℃, cooling to room temperature, taking out the corrugated paper, repeatedly washing with distilled water and alcohol, and drying to finish the processing technology of the corrugated paper.
2. A process of making corrugated paper having improved moisture resistance as claimed in claim 1, wherein in step S1, the mass ratio of stannous chloride to p-toluenesulfonic acid is 3-3.5: 5.
3. The processing method for remarkably improving the moisture resistance of corrugated paper as claimed in claim 1, wherein in the process step S2, the mass ratio of the sodium borohydride to the p-toluenesulfonic acid is 1.3-1.6: 5.
4. The processing method for remarkably improving the moisture resistance of corrugated paper as claimed in claim 1, wherein in the process step S3, the mass ratio of tin dichloride to sodium borohydride in the mixed powder is 2.0-2.3: 1; the mass ratio of the potassium chloride to the mixed powder is 4-4.3: 1.
5. A process of significantly improving the moisture resistance of corrugated board as defined in claim 1, wherein in step S4, the web forming is performed in a web forming system using equipment including breast roll shakers and gravity dewatering boxes; the breast roll shaker generates vibration in the banner direction, the frequency of the vibration is 5-10Hz, and the amplitude is 5-10 mm; the gravity dewatering box is provided with a ceramic water scraping strip with adjustable angle and height, the water scraping angle of the ceramic water scraping strip is-5-5 degrees, and the water scraping height of the ceramic water scraping strip is 1-4 mm.
6. The processing method for remarkably improving the moisture resistance of corrugated paper as claimed in claim 1, wherein in the process step S5, the mass-to-volume ratio of the sodium tungstate dihydrate to the alcohol solution is 3-5:100g/mL, and the mass fraction of the alcohol solution is 30-35%; the mass fraction of the concentrated sulfuric acid is 95-98%; the drying temperature is 60-70 ℃, and the drying time is 20-25 h.
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| CN115897280A (en) * | 2022-12-31 | 2023-04-04 | 苏州帝德拉包装材料有限公司 | Moisture-proof and waterproof material for corrugated carton and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115897280A (en) * | 2022-12-31 | 2023-04-04 | 苏州帝德拉包装材料有限公司 | Moisture-proof and waterproof material for corrugated carton and preparation method thereof |
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Application publication date: 20211221 |