CN111622020A - Waterproof kraft paper with strong tensile property in length direction and preparation method thereof - Google Patents

Waterproof kraft paper with strong tensile property in length direction and preparation method thereof Download PDF

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Publication number
CN111622020A
CN111622020A CN202010361373.7A CN202010361373A CN111622020A CN 111622020 A CN111622020 A CN 111622020A CN 202010361373 A CN202010361373 A CN 202010361373A CN 111622020 A CN111622020 A CN 111622020A
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waterproof
kraft paper
paper
length direction
water
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CN111622020B (en
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黄建超
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Fujian Minqing Shuangleng Paper Co ltd
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Fujian Minqing Shuangleng Paper Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/42—Applications of coated or impregnated materials
    • 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/09—Sulfur-containing compounds
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups 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
    • 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
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate
    • 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
    • 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
    • D21H21/22—Agents rendering paper porous, absorbent or bulky
    • D21H21/24—Surfactants
    • 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
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention relates to the technical field of kraft paper, and particularly discloses waterproof kraft paper with strong tensile property in the length direction and a preparation method thereof, wherein the waterproof kraft paper comprises a bottom layer and waterproof layers sprayed on two surfaces of the bottom layer, the bottom layer is raw paper, softwood is taken as a raw material, the raw paper is crushed, filtered, steamed and degummed, then water is added and ground into pulp to prepare softwood fiber raw pulp, the raw paper is soaked in water after a water reducing process to absorb magnetic liquid, and then the raw paper is made into paper in a unidirectional magnetic field environment and is squeezed and dehydrated to obtain the raw paper; the waterproof layer is formed by coating the raw paper layer through a fog chamber filled with atomized waterproof paint after electrostatic treatment. The kraft paper of the invention has excellent tensile strength in the length direction after being treated by magnetic liquid and magnetic field, and the waterproof layer is made by electrostatic treatment and a waterproof coating fog chamber and has good waterproof property.

Description

Waterproof kraft paper with strong tensile property in length direction and preparation method thereof
Technical Field
The invention relates to the technical field of kraft paper, and particularly discloses waterproof kraft paper with strong tensile property in the length direction and a preparation method thereof.
Background
Kraft paper is a common packaging paper material, has higher strength than common packaging paper, is yellowish brown or yellow in surface, has very excellent tensile property and fracture resistance, cannot fracture under certain pulling, is in two shapes of a roll and a flat plate under a common paper state, and can be used in occasions such as envelope paper, asphalt paper and the like.
In the kraft paper bags, particularly heavy goods, most of the kraft paper on the market has uneven tensile properties and uneven distribution of tensile properties, and the kraft paper bags break during use. The kraft paper with uniform directional tensile strength in the market is still less than the common kraft paper and has waterproof performance.
Disclosure of Invention
The invention aims to provide waterproof kraft paper with strong tensile property in the length direction and a preparation method thereof, so as to solve the problems in the background technology.
The technical scheme of the invention is as follows:
in order to achieve the purpose, the invention provides the following technical scheme: the waterproof kraft paper comprises a bottom layer and waterproof layers sprayed on two sides of the bottom layer, wherein the bottom layer is base paper, needle-leaved wood is used as a raw material, needle-leaved wood fiber raw pulp is prepared by crushing, filtering, stewing, degumming, adding water and grinding into slurry, magnetic liquid is soaked and absorbed by the needle-leaved wood fiber raw pulp through a water reducing process, and then the raw paper is obtained by papermaking forming and squeezing dehydration in a unidirectional magnetic field environment; the waterproof layer is formed by coating the raw paper layer through a fog chamber filled with atomized waterproof paint after electrostatic treatment.
The magnetic liquid is ferrite magnetic liquid.
The preparation method of the ferrimagnetic liquid comprises the following steps:
(1) FeCl was added at room temperature2And FeCl3(the ratio is 1:2) dissolving in ethanol-containing solution, adding excessive ammonia water while stirring to obtain ferrimagnetic particles;
(2) the surface of the ferrite magnetic particle is coated with oleic acid as a surfactant, then the ferrite magnetic particle is added into a mixed solvent of ethane and organic silicon (the volume ratio is 1:1), the mixture is continuously stirred for 1 to 3 hours at the temperature of 50 ℃ until flocculate is completely dissolved in the solvent, and low boiling point components are removed by vacuum for 1 to 3 hours to prepare the ferrite magnetic liquid coated with the oleic acid.
The unidirectional magnetic field environment is in a magnetic field direction along the length direction of kraft paper.
Furthermore, the unidirectional magnetic field environment is generated by two large rectangular magnets with opposite N-level and S-level which are respectively arranged at the front side and the rear side of the papermaking cylinder. The two magnets have N-level and S-level opposite to each other, and the formed unidirectional magnetic field is along the length direction of kraft paper and covers the papermaking cylinder.
The waterproof agent of the waterproof layer comprises, by weight, 10-20 parts of acrylic resin, 10-20 parts of polyvinyl alcohol, 5-10 parts of cationic starch, 3-5 parts of sodium dodecyl sulfate and the balance of distilled water.
The preparation method of the waterproof agent for the waterproof layer comprises the following steps:
(1) pouring acrylic resin and polyvinyl alcohol with the formula ratio into distilled water, heating to 85 ℃, and stirring for 10 min;
(2) and (2) adding the cationic starch and the sodium dodecyl sulfate in the formula ratio into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
The preparation method of the waterproof kraft paper with strong tensile property in the length direction comprises the following steps:
(1) cutting the softwood into blocks, crushing, filtering, cooking, degumming, adding water, grinding into slurry until the beating degree is 30-40 DEG SR to obtain softwood fiber raw slurry, performing preliminary dehydration on the softwood fiber raw slurry through mechanical extrusion, scattering, uniformly paving on a drying plate, feeding into an oven, and drying at 100 ℃ for 20-30 minutes to obtain the water-reduced softwood fiber raw slurry;
(2) soaking the softwood fiber raw pulp in the prepared magnetic liquid for 10min, then fishing out, putting the softwood fiber raw pulp into unidirectional magnetic fields with the magnetic induction intensity of 1.2-1.5T and the direction along the length direction, wherein the N-level and S-level of two large rectangular magnets are opposite and respectively arranged at the front side and the rear side of a papermaking cylinder, and after ultrasonic magnetization is carried out for 1-2h, papermaking forming, squeezing, dewatering and drying are carried out to obtain bottom base paper;
(3) and (2) performing electrostatic treatment on the surface of the dried bottom base paper by adopting an electrostatic generator, conveying the bottom base paper subjected to electrostatic treatment in a tensioning state into a fog chamber filled with prepared waterproof agent spray for 1-2 hours, completing preparation of a waterproof layer by spraying the base paper with an electrostatic adsorption waterproof agent, and finally drying by using a hot roller to obtain the waterproof kraft paper.
Wherein, the cooking specifically comprises the following steps: steaming the filtrate at 100 deg.C for 3-4H, adding 10% NaOH solution and 25% H2O2Mixing the solutions uniformly, reacting at 80-90 deg.C for 1-2h, and steaming at 100 deg.C for 2-3 h.
Wherein the degumming comprises: adding glacial acetic acid and 25% nitric acid solution into the obtained cooked product, mixing, reacting at 120 deg.C for 1-2 hr, cooling, and washing with water to neutrality.
Wherein, the squeezing step adopts four-roller three-pressure composite squeezing, and the linear pressure of each area is as follows: 5.5MPa in the first area, 6.5MPa in the second area, 5MPa in the third area and 5MPa in the fourth area.
The invention has the following beneficial effects:
compared with the prior art, the invention has the beneficial effects that the tensile property of the kraft paper in the length direction is strong and the waterproof aspect is as follows:
1. the Magnetic Liquids (Magnetic Liquids) are not liquid Magnetic materials, but are homogeneous colloidal solutions in which nanoscale ultrafine Magnetic fine particles treated with a surfactant are highly dispersed in a base liquid. The solution does not generate agglomeration and precipitation phenomena under the action of gravity and a magnetic field, has the magnetism of solid and the fluidity of liquid, and therefore has a plurality of unique properties. The prepared original softwood fiber pulp is mostly long fibers, and is immersed in magnetic liquid, and the softwood fiber has magnetism due to the fact that the softwood fiber absorbs the magnetic liquid.
On one hand, the softwood fibers absorbing the magnetic liquid in the primary pulp tend to be arranged in the same direction under the action of a unidirectional magnetic field along the length direction (the action of two magnets outside a papermaking cylinder) like a micro magnet, and the fibers extend along the length direction; on the other hand, ultrasonic vibration is simultaneously carried out in a unidirectional magnetic field environment, the ultrasonic vibration is beneficial to enabling softwood fibers to tend to be arranged in the same direction and stretch along the length direction, and the ultrasonic vibration is also beneficial to enabling overlapped and agglomerated long fibers to be dispersed to form compact and uniform single-layer distribution. The softwood fibers tend to be arranged in the same direction, a more compact structure can be formed, and the tensile strength of the kraft paper in the fixed direction (length direction) is greatly improved. Kraft paper having excellent tensile properties in the longitudinal direction can sufficiently exhibit the superiority of directional tensile strength even when rolled and formed into a paper bag in the direction.
2. The water reducing process includes extruding the original softwood fiber pulp mechanically to eliminate partial water, spreading the extruded pulp on a drying board, stoving in an oven at 100 deg.c and eliminating water from the pulp to obtain the dewatered virgin softwood fiber pulp. The water reducing process aims to remove most of water in the original softwood fiber pulp, so that the original softwood fiber pulp after water reduction can better absorb more magnetic liquid in the next step, and the softwood fiber can fully absorb the magnetism of the magnetic liquid.
3. After the bottom base paper prepared by the invention is subjected to electrostatic treatment by the electrostatic generator, the bottom base paper with the electrostatic surface enters the fog chamber filled with the waterproof agent spray to be placed (the waterproof agent spray in the fog chamber is supplemented in real time to ensure the concentration of the waterproof agent fog in the fog chamber), so that the base paper can uniformly and fully adsorb the waterproof agent fog drops in the fog chamber to two surfaces of the bottom base paper through the electrostatic to form waterproof layers. Due to the electrostatic action, the waterproof layer adsorbed by the base paper has no adsorption dead angle, and the waterproof layer is ensured to be thinly and uniformly distributed on the two surfaces of the base paper.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
preparing the ferrimagnetic liquid: (1) FeCl was added at room temperature2And FeCl3(the ratio is 1:2) dissolving in ethanol-containing solution, adding excessive ammonia water while stirring to obtain ferrimagnetic particles; (2) the surface of the ferrite magnetic particle is coated with oleic acid as a surfactant, then the ferrite magnetic particle is added into a mixed solvent of ethane and organic silicon (the volume ratio is 1:1), the mixture is continuously stirred for 1 hour at the temperature of 50 ℃ until flocculate is completely dissolved in the solvent, and low boiling point components are removed by vacuum for 1 hour to prepare the ferrite magnetic liquid coated with the oleic acid.
The waterproof agent comprises, by weight, 10 parts of acrylic resin, 10 parts of polyvinyl alcohol, 5 parts of cationic starch, 3 parts of sodium dodecyl sulfate and the balance of distilled water.
The preparation method of the waterproof agent comprises the following steps: (1) pouring acrylic resin and polyvinyl alcohol with the formula ratio into distilled water, heating to 85 ℃, and stirring for 10 min; (2) and (2) adding the cationic starch and the sodium dodecyl sulfate in the formula ratio into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
The preparation method of the kraft paper comprises the following steps:
(1) cutting needle-leaved wood into pieces, pulverizing, filtering, steaming the filtrate at 100 deg.C for 3 hr, adding 10% NaOH solution and 25% H2O2Uniformly mixing the solution, reacting at 80-90 ℃ for 1h, and steaming at 100 ℃ for 2h to obtain a steamed substance;
(2) adding glacial acetic acid and nitric acid solution with the mass fraction of 25% into the cooked substance obtained in the step (1), uniformly mixing, reacting at 120 ℃ for 1h, cooling, washing with water to be neutral, adding water, grinding pulp until the beating degree is 30 DEG SR, obtaining softwood fiber raw pulp, mechanically extruding the softwood fiber raw pulp to preliminarily dewater, scattering, uniformly spreading on a drying plate, sending into an oven, and drying at 100 ℃ for 20 minutes to obtain the water-reduced softwood fiber raw pulp;
(3) soaking the original softwood fiber pulp in prepared magnetic liquid for 10min, fishing out, putting the original softwood fiber pulp into a unidirectional magnetic field with the magnetic induction intensity of 1.2T and the direction along the length direction, wherein the N level and the S level of two large rectangular magnets are opposite and respectively arranged in the front side and the rear side of a papermaking cylinder, ultrasonically magnetizing the original softwood fiber pulp for 1h, papermaking and forming, carrying out compound pressing through four-roll three-pressing (the linear pressure of each region is 5.5MPa in the first region, 6.5MPa in the second region, 5MPa in the third region and 5MPa in the fourth region), and drying to obtain base raw paper;
(4) carrying out electrostatic treatment on the surface of the dried bottom base paper by adopting an electrostatic generator, conveying the bottom base paper after electrostatic treatment in a tensioning state into a fog chamber filled with prepared waterproof agent spray for 1h, finishing the preparation of a waterproof layer by spraying the base paper through electrostatic adsorption waterproof agent, and finally drying through a hot roller to obtain waterproof kraft paper.
Example 2:
preparing the ferrimagnetic liquid: (1) FeCl was added at room temperature2And FeCl3(the ratio is 1:2) dissolving in ethanol-containing solution, adding excessive ammonia water while stirring to obtain ferrimagnetic particles; (2) the surface of the ferrite magnetic particle is coated with oleic acid as a surfactant, then the ferrite magnetic particle is added into a mixed solvent of ethane and organic silicon (the volume ratio is 1:1), the mixture is continuously stirred for 2 hours at 50 ℃ until flocculate is completely dissolved in the solvent, and low boiling point components are removed by vacuum for 2 hours to prepare the ferrite magnetic liquid coated with the oleic acid.
The waterproof agent comprises 15 parts of acrylic resin, 20 parts of polyvinyl alcohol, 8 parts of cationic starch, 4 parts of sodium dodecyl sulfate and the balance of distilled water.
The preparation method of the waterproof agent comprises the following steps: (1) pouring acrylic resin and polyvinyl alcohol with the formula ratio into distilled water, heating to 85 ℃, and stirring for 10 min; (2) and (2) adding the cationic starch and the sodium dodecyl sulfate in the formula ratio into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
The preparation method of the kraft paper comprises the following steps:
(1) cutting folium Pini into pieces, and pulverizingFiltering, steaming the filtrate at 100 deg.C for 3.5H, adding 10% NaOH solution and 25% H2O2Uniformly mixing the solution, reacting at 80-90 deg.C for 1.5h, and steaming at 100 deg.C for 2.5h to obtain a steamed product;
(2) adding glacial acetic acid and nitric acid solution with the mass fraction of 25% into the cooked product obtained in the step (1), uniformly mixing, reacting at 120 ℃ for 1.5h, cooling, washing to be neutral, adding water, grinding pulp until the beating degree is 35 DEG SR, obtaining softwood fiber raw pulp, primarily dehydrating the softwood fiber raw pulp through mechanical extrusion, scattering, uniformly spreading on a drying plate, sending into an oven, and drying at 100 ℃ for 25 minutes to obtain the water-reduced softwood fiber raw pulp;
(3) soaking the original softwood fiber pulp in prepared magnetic liquid for 10min, fishing out, putting the original softwood fiber pulp into a unidirectional magnetic field with the magnetic induction intensity of 1.4T, the direction of the unidirectional magnetic field is along the length direction, the N-level and the S-level of two large rectangular magnets are opposite, and the unidirectional magnetic field is respectively arranged in the front side and the rear side of a papermaking cylinder, after ultrasonic magnetization is carried out for 1.5h, papermaking forming, composite pressing through four rollers and three pressing (the linear pressure of each area is 5.5MPa in a first area, 6.5MPa in a second area, 5MPa in a third area and 5MPa in a fourth area), and drying to prepare base raw paper;
(4) and (2) carrying out electrostatic treatment on the surface of the dried bottom base paper by adopting an electrostatic generator, conveying the bottom base paper subjected to electrostatic treatment in a tensioning state into a fog chamber filled with prepared waterproof agent spray for 1.5h, finishing preparation of a waterproof layer by spraying the base paper through electrostatic adsorption waterproof agent, and finally drying through a hot roller to obtain the waterproof kraft paper.
Example 3:
preparing the ferrimagnetic liquid: (1) FeCl was added at room temperature2And FeCl3(the ratio is 1:2) dissolving in ethanol-containing solution, adding excessive ammonia water while stirring to obtain ferrimagnetic particles; (2) coating oleic acid on the surface of the ferrite magnetic particle as a surfactant, adding the surfactant into a mixed solvent of ethane and organic silicon (the volume ratio is 1:1), continuously stirring for 3 hours at 50 ℃ until flocculate is completely dissolved in the solvent, removing low boiling point components by vacuum for 3 hours to prepare the ferrite magnetic liquid coated with the oleic acid。
The waterproof agent comprises, by weight, 20 parts of acrylic resin, 15 parts of polyvinyl alcohol, 10 parts of cationic starch, 5 parts of sodium dodecyl sulfate and the balance of distilled water.
The preparation method of the waterproof agent comprises the following steps: (1) pouring acrylic resin and polyvinyl alcohol with the formula ratio into distilled water, heating to 85 ℃, and stirring for 10 min; (2) and (2) adding the cationic starch and the sodium dodecyl sulfate in the formula ratio into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
The preparation method of the kraft paper comprises the following steps:
(1) cutting needle-leaved wood into pieces, pulverizing, filtering, steaming the filtrate at 100 deg.C for 4 hr, adding 10% NaOH solution and 25% H2O2Uniformly mixing the solution, reacting at 80-90 ℃ for 2h, and steaming at 100 ℃ for 3h to obtain a steamed product;
(2) adding glacial acetic acid and a nitric acid solution with the mass fraction of 25% into the cooked substance obtained in the step (1), uniformly mixing, reacting at 120 ℃ for 2h, cooling, washing with water to be neutral, adding water, grinding the pulp until the beating degree is 40 DEG SR, obtaining softwood fiber raw pulp, mechanically extruding the softwood fiber raw pulp to preliminarily dehydrate, scattering, uniformly spreading on a drying plate, sending into an oven, and drying at 100 ℃ for 30 minutes to obtain the water-reduced softwood fiber raw pulp;
(3) soaking the original softwood fiber pulp in prepared magnetic liquid for 10min, fishing out, putting the original softwood fiber pulp into a unidirectional magnetic field with the magnetic induction intensity of 1.5T and the direction along the length direction, wherein the N level and the S level of two large rectangular magnets are opposite and respectively arranged in the front side and the rear side of a papermaking cylinder, carrying out ultrasonic magnetization for 2h, papermaking and forming, carrying out composite pressing through four-roll three-pressing (the linear pressure of each zone is 5.5MPa in a first zone, 6.5MPa in a second zone, 5MPa in a third zone and 5MPa in a fourth zone), and drying to obtain base raw paper;
(4) and (2) performing electrostatic treatment on the surface of the dried bottom base paper by adopting an electrostatic generator, conveying the bottom base paper subjected to electrostatic treatment in a tensioning state into a fog chamber filled with prepared waterproof agent spray for 2h, completing preparation of a waterproof layer by spraying the base paper with an electrostatic adsorption waterproof agent, and finally drying by a hot roller to obtain the waterproof kraft paper.
Comparative example 1:
on the basis of the example 3, the magnetic liquid is not prepared, the virgin softwood fiber pulp is not immersed in the magnetic liquid, the papermaking process is directly carried out without superposing a magnetic field along the length direction, and then the waterproof kraft paper is prepared by adsorbing a waterproof layer on the base raw paper according to the formula and the preparation parameters of the example 3.
Comparative example 2:
on the basis of the example 3, the magnetic liquid is not prepared, the original softwood fiber pulp is not immersed in the magnetic liquid, the direct papermaking molding is not required to be carried out in the papermaking process by superposing a magnetic field along the length direction, and the kraft paper is not subjected to the next adsorption preparation of a waterproof layer to obtain the kraft paper.
And (3) performance test aspects: kraft paper was produced according to the methods of examples 1 to 3 and comparative examples 1 to 2, and the properties of the produced kraft paper were examined according to the following methods: the quantitative, bursting strength, tearing strength and water absorption of the kraft papers prepared in the examples and the comparative examples were measured according to the standard requirements of GB/T22865-2008 kraft paper, and the obtained experimental results are as follows:
TABLE 1 results of measuring Properties of examples 1 to 3 and comparative examples 1 to 2
Item Example 1 Example 2 Example 3 Comparative example 1 Comparative example 2
Quantitative g/m2 100 100 100 100 100
Longitudinal tear mN m2/g 9.0 9.2 9.5 8.1 7.8
Burst strength kPa m2/g 3.79 3.86 3.97 2.72 2.54
Water absorption g/m2 28 27 25 31 39
From the experimental results of table 1 we can see that:
comparing the comparative examples 1-2 and the examples 1-3 comprehensively, the tensile strength in the length direction of the prepared kraft paper, namely longitudinal tearing strength and bursting strength, can be greatly improved by soaking the softwood fiber raw stock in magnetic liquid and then carrying out ultrasonic papermaking in a magnetic field. Because the softwood fibers absorbing the magnetic liquid in the primary pulp tend to be arranged in the same direction under the action of a magnetic field along the length direction (the action of two magnets outside the papermaking cylinder) just like a micro magnet, the fibers extend along the length direction, a more compact structure can be formed, and the tensile strength of kraft paper in the fixed direction (length direction) is greatly improved
Comparing examples 1-3, example 3 is the best performance, on one hand, it may be that the longer the time for drying the virgin softwood pulp after mechanical extrusion and drying, the less the water content left, the more magnetic liquid the virgin pulp can absorb, which is helpful for the ordered arrangement of the virgin softwood fiber pulp in the magnetic field; on the other hand, the stronger the applied magnetic field intensity, the longer the magnetic field covering time and the ultrasonic time are, the more the softwood fiber primary pulp which is beneficial to the magnetic liquid of the lower hand tends to be arranged in the same direction and extends along the length direction, and the ultrasonic vibration is also beneficial to the overlapped and agglomerated long fibers to be dispersed to form compact and uniform single-layer distribution, so that the longitudinal tear strength and the burst strength of the kraft paper are improved.
In comparative example 3 and comparative examples 1 to 2, the base paper was electrostatically treated and adsorbed with the water repellent in the mist chamber filled with the mist of the water repellent to complete the spray coating of the water repellent, and the adsorbed water repellent was thin and complete, and the water absorbency of the kraft paper adsorbed with the water repellent was significantly lower than that of kraft paper not coated or coated with the water repellent.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. Waterproof kraft paper that tensile strength can be strong in length direction, its characterized in that: the waterproof kraft paper comprises a bottom layer and waterproof layers sprayed on two sides of the bottom layer, wherein the bottom layer is base paper, needle-leaved wood is used as a raw material, needle-leaved wood fiber raw pulp is prepared by crushing, filtering, stewing, degumming, adding water and grinding into slurry, magnetic liquid is soaked and absorbed by the needle-leaved wood fiber raw pulp through a water reducing process, and then the raw paper is obtained by papermaking forming and squeezing dehydration in a unidirectional magnetic field environment; the waterproof layer is formed by coating the raw paper layer through a fog chamber filled with atomized waterproof paint after electrostatic treatment.
2. The waterproof kraft paper having a strong tensile property in a length direction according to claim 1, wherein: the magnetic liquid is ferrite magnetic liquid.
3. The waterproof kraft paper having a strong tensile property in a length direction according to claim 2, wherein: the preparation method of the ferrimagnetic liquid comprises the following steps: (1) FeCl was added at room temperature2And FeCl3Dissolving the mixture in ethanol solution according to the ratio of 1:2, and adding excessive ammonia water while stirring to obtain ferrimagnetic particles; (2) and coating oleic acid on the surface of the ferrite magnetic particle to be used as a surfactant, adding the surfactant into a mixed solvent of ethane and organic silicon in a volume ratio of 1:1, continuously stirring for 1-3 hours at 50 ℃ until flocculate is completely dissolved in the solvent, and removing low-boiling-point components by vacuum for 1-3 hours to prepare the ferrite magnetic liquid coated with the oleic acid.
4. The waterproof kraft paper having a strong tensile property in a length direction according to claim 1, wherein: the unidirectional magnetic field environment is in a magnetic field direction along the length direction of kraft paper.
5. The waterproof kraft paper having a strong tensile property in a length direction according to claim 4, wherein: the unidirectional magnetic field environment is generated by two large rectangular magnets with opposite N-level and S-level and respectively arranged at the front side and the rear side of the papermaking cylinder.
6. The waterproof kraft paper having a strong tensile property in a length direction according to claim 1, wherein: the waterproof agent of the waterproof layer comprises, by weight, 10-20 parts of acrylic resin, 10-20 parts of polyvinyl alcohol, 5-10 parts of cationic starch, 3-5 parts of sodium dodecyl sulfate and the balance of distilled water.
7. The waterproof kraft paper having a strong tensile property in a length direction according to claim 1, wherein: the preparation method of the waterproof agent for the waterproof layer comprises the following steps: (1) pouring acrylic resin and polyvinyl alcohol with the formula ratio into distilled water, heating to 85 ℃, and stirring for 10 min; (2) and (2) adding the cationic starch and the sodium dodecyl sulfate in the formula ratio into the solution prepared in the step (1), and stirring for 30min at 55 ℃ to prepare the waterproof agent.
8. The method for manufacturing waterproof kraft paper having a strong tensile strength in the longitudinal direction according to claim 1, wherein: the method comprises the following steps:
(1) cutting the softwood into blocks, crushing, filtering, cooking, degumming, adding water, grinding into slurry until the beating degree is 30-40 DEG SR to obtain softwood fiber raw slurry, performing preliminary dehydration on the softwood fiber raw slurry through mechanical extrusion, scattering, uniformly paving on a drying plate, feeding into an oven, and drying at 100 ℃ for 20-30 minutes to obtain the water-reduced softwood fiber raw slurry;
(2) soaking the water-reduced softwood fiber raw pulp in prepared magnetic liquid for 10min, fishing out, putting into unidirectional magnetic fields with the magnetic induction intensity of 1.2-1.5T and the direction along the length direction, wherein N and S levels of two large rectangular magnets are opposite and respectively arranged in the front and rear sides of a papermaking cylinder, ultrasonically magnetizing for 1-2h, papermaking forming, squeezing, dehydrating and drying to obtain bottom base paper;
(3) and (2) performing electrostatic treatment on the surface of the dried bottom base paper by adopting an electrostatic generator, conveying the bottom base paper subjected to electrostatic treatment in a tensioning state into a fog chamber filled with prepared waterproof agent spray for 1-2 hours, completing preparation of a waterproof layer by spraying the base paper with an electrostatic adsorption waterproof agent, and finally drying by using a hot roller to obtain the waterproof kraft paper.
9. The waterproof kraft paper with strong tensile property in the lengthwise direction according to claim 1 or 8, wherein: the cooking specifically comprises the following steps: steaming the filtrate at 100 deg.C for 3-4H, adding 10% NaOH solution and 25% H2O2The solution is mixed evenly inReacting at 80-90 deg.C for 1-2h, and steaming at 100 deg.C for 2-3 h.
10. The waterproof kraft paper with strong tensile property in the lengthwise direction according to claim 1 or 8, wherein: the degumming comprises the following steps: adding glacial acetic acid and 25% nitric acid solution into the obtained cooked product, mixing, reacting at 120 deg.C for 1-2 hr, cooling, and washing with water to neutrality; the squeezing step adopts four-roller three-pressure composite squeezing, and the linear pressure of each area is as follows: 5.5MPa in the first area, 6.5MPa in the second area, 5MPa in the third area and 5MPa in the fourth area.
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