CN111270561B - High-whiteness yellowing-resistant coated white cardboard and preparation method thereof - Google Patents

High-whiteness yellowing-resistant coated white cardboard and preparation method thereof Download PDF

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CN111270561B
CN111270561B CN202010111605.3A CN202010111605A CN111270561B CN 111270561 B CN111270561 B CN 111270561B CN 202010111605 A CN202010111605 A CN 202010111605A CN 111270561 B CN111270561 B CN 111270561B
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pulp
fiber
layer
fluorescent whitening
whiteness
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CN111270561A (en
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丁鹏翔
张克庆
王晶晶
钱凯锋
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Asia Pacific Senbo Jiangsu Pulp And Paper Co ltd
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Asia Symbol Shandong Pulp And 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers
    • 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
    • D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
    • D21H11/04—Kraft or sulfate pulp
    • 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
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/385—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
    • D21H19/36—Coatings with pigments
    • D21H19/38—Coatings with pigments characterised by the pigments
    • D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/54—Starch
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
    • 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
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Dispersion Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Paper (AREA)

Abstract

The invention provides a high-whiteness yellowing-resistant coated ivory board and a preparation method thereof.A wood pulp is pretreated by biological enzyme, so that the pulping degree of pulp can be greatly reduced, the pulping energy consumption is reduced, the whiteness of the paper can be indirectly improved by improving the opacity of the pulp, the bulk of the paper can be improved on the premise of ensuring the strength index of the paper, the dependence on mechanical pulp is greatly reduced, the ratio of bleached sulfate hardwood pulp to bleached sulfate softwood pulp can be improved, and the use of a fluorescent whitening agent in the pulp is reduced; the fluorescent whitening agent is added into the core layer pulp and the surface sizing material, so that the whitening effect can be improved, the using amount of the fluorescent whitening agent in the pulp is further reduced, the rapid adjustment of the whiteness of the base paper is realized, and the base paper layer with uniform and stable whiteness is obtained; the adjustment ensures that the amount of the fluorescent whitening agent in the white cardboard paper pulp is small, the whiteness and the hue are adjusted quickly and stably, the natural and soft appearance is presented under the ultrahigh whiteness, and the yellowing resistance is good.

Description

High-whiteness yellowing-resistant coated white cardboard and preparation method thereof
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a high-whiteness yellowing-resistant coated white cardboard and a preparation method thereof.
Background
In the production of coated white cardboard, fluorescent whitening agents are usually added to the pulp and the coating to improve the whiteness of the paper. The whitening effect of the fluorescent whitening agent added to the pulp on paper is mainly influenced by the factors such as the type of the fluorescent whitening agent, the whiteness of the pulp, the lignin content of the pulp, cationic chemicals, the pH value of a system, fillers and the like. In order to better exert the whitening effect of the fluorescent whitening agent to improve the whiteness of paper, the influence factors such as the type of the fluorescent whitening agent, cationic chemicals, system pH, fillers and the like can be optimized through relatively simple process design. But the whiteness and lignin content of the pulp are influenced by the index requirement of the paper-making, so that the pulp is difficult to adjust greatly.
The common pulp used in the production process of the white cardboard comprises bleached softwood chemical pulp, bleached hardwood chemical pulp and mechanical pulp. Wherein, the bleached softwood chemical pulp and the bleached hardwood chemical pulp have high whiteness and low lignin content, but lower bulk; mechanical pulp has a higher bulk, but a lower brightness and a higher lignin content. Thus, paper produced using mechanical pulp has a lower brightness and a lower affinity for optical brighteners than paper made using bleached softwood/hardwood chemical pulp, requiring the addition of more optical brighteners to achieve high brightness.
In addition, in order to achieve the expected paper strength in the production process of the white cardboard, the pulp needs to be subjected to a large degree of mechanical refining treatment, but the pulp is subjected to the large degree of mechanical refining treatment, so that the loose thickness of the paper is greatly reduced. Therefore, a large amount of mechanical pulp has to be used in the production of white cardboard to meet the paper bulk requirement.
Therefore, the existing high-whiteness coated white cardboard is usually produced by using a large amount of mechanical pulp and adding a large amount of fluorescent whitening agent into the pulp. The process can generate various adverse effects on the product quality and the paper machine operation: firstly, not only is it difficult to achieve high whiteness of paper, but also it is not conducive to stable control of paper hue; secondly, the hue of the paper is more dazzling in visual sense, and is not soft and natural; thirdly, after a large amount of fluorescent whitening agent enters a white water system of a paper machine, the cost of wastewater treatment is increased, and the fluorescent product needs to be transited for a long time or stopped for cleaning when being converted, so that great conversion loss is caused; fourthly, the paper is easy to have serious yellowing under light induction and heat induction; fifthly, the paper has low strength, poor toughness and poor surface smoothness and fineness.
Disclosure of Invention
In view of the above, the technical problem to be solved by the present invention is to provide a high-whiteness yellowing-resistant coated ivory board with less fluorescent whitening agent, fast whiteness and hue adjustment speed, stability and good yellowing resistance, and a preparation method thereof.
The invention provides a preparation method of a high-whiteness yellowing-resistant coated white cardboard, which comprises the following steps:
s1) slurry treatment:
mixing bleached sulfate hardwood pulp with a first biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain a hardwood fiber pulp;
mixing bleached sulfate softwood pulp with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain softwood fiber pulp;
or mixing the mixed wood pulp of the bleached sulfate broad leaves and the bleached sulfate coniferous leaves with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain mixed fiber pulp;
the first and second biological enzymes are each independently selected from cellulases and/or hemicellulases;
s2) mixing:
mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain surface layer pulp;
mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp with a fluorescent whitening agent to obtain core layer pulp;
mixing one or more of broad-leaved fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain bottom layer pulp;
and the surface layer slurry, the core layer slurry and the bottom layer slurry all contain broadleaf fibers and coniferous fibers, wherein the mass ratio of the broadleaf fibers to the coniferous fibers is (60-90): (10-40);
s3) respectively dehydrating the surface layer slurry, the core layer slurry and the bottom layer slurry, and carrying out composite forming to obtain the high-whiteness yellowing-resistant coated ivory board.
Preferably, the dosage of the first biological enzyme and the second biological enzyme is 0.1-1.5 kg/ton of the absolute dry pulp independently.
Preferably, the bleaching of the sulfate hardwood pulp in the step S1) is carried out for 30-120 min by mixing with the first biological enzyme; the bleached sulfate softwood pulp and the second biological enzyme are mixed for treatment for 30-120 min; or the bleached sulfate hardwood pulp, the bleached sulfate softwood pulp and the second biological enzyme are mixed for treatment for 30-120 min.
Preferably, the hardwood fiber slurry comprises a first hardwood fiber slurry and a second hardwood fiber slurry; the first hardwood fiber pulp is obtained by mixing bleached sulfate hardwood pulp with a first biological enzyme, treating for 30-110 min and then carrying out pulp grinding treatment; the second hardwood fiber pulp is obtained by mixing bleached sulfate hardwood pulp with the first biological enzyme, treating for 40-120 min and then carrying out pulp grinding treatment; the time difference between the second broadleaf fiber pulp and the first broadleaf fiber pulp in preparation and the time of the first biological enzyme treatment is 5-20 min.
Preferably, the slurry mixture is:
mixing one or more of the first broadleaf fiber pulp, the first needle leaf fiber pulp and the mixed pulp to obtain surface layer pulp;
mixing one or more of the second broadleaf fiber pulp, the second softwood fiber pulp and the mixed pulp with a fluorescent whitening agent to obtain core layer pulp; or mixing the first broadleaf fiber pulp or the second fiber pulp, the mixed fiber pulp and the fluorescent whitening agent to obtain core layer pulp;
and mixing the first broadleaf fiber pulp, the second broadleaf fiber pulp and one or more of the mixed fiber pulps to obtain the bottom layer pulp.
Preferably, the concentration of the bleached sulfate hardwood pulp in the step S1) is 2.5-5.0% after the bleached sulfate hardwood pulp is mixed with the first biological enzyme for treatment; after the bleached sulfate softwood pulp is mixed with the second biological enzyme for treatment, the concentration of the bleached sulfate softwood pulp during pulping treatment is 2.5-5.0%; the concentration of the bleached sulfate hardwood pulp, bleached sulfate softwood pulp and the second biological enzyme is 2.5-5.0% during pulping treatment after being mixed and treated;
the freeness of the broadleaf fiber pulp, the needle-leaf fiber pulp and the mixed fiber pulp in the step S1) is respectively and independently 350-750 ml.
Preferably, the amount of the fluorescent whitening agent in the core layer slurry is 0.5-10 kg per ton of paper; the fluorescent whitening agent is selected from one or more of disulfonic acid fluorescent whitening agents, tetrasulfonic acid fluorescent whitening agents and hexasulfonic acid fluorescent whitening agents.
Preferably, after the composite forming in step S3), surface sizing and/or bottom sizing are further performed on the surface of the surface layer and/or the surface of the bottom layer to obtain a high-whiteness coated ivory board; the sizing materials used for surface sizing of the surface layer and surface sizing of the bottom layer comprise starch, water and fluorescent whitening agent; the dosage of the fluorescent whitening agent in the sizing material used for surface sizing of the surface layer and the sizing material used for surface sizing of the bottom layer is 1-8 kg/ton of paper respectively and independently.
Preferably, coating a coating on the surface sizing layer of the surface layer to form a coating layer, so as to obtain the high-whiteness coated white cardboard; the coating comprises 40-60 parts by weight of calcium carbonate, 3-10 parts by weight of china clay, 2-5 parts by weight of styrene-butadiene latex, 1-7 parts by weight of latex, 0-3 parts by weight of starch, 0-1 part by weight of fluorescent whitening agent and 30-40 parts by weight of water; the latex is selected from one or more of vinyl acetate-ethylene copolymer latex, polyvinyl acetate latex and styrene-n-butyl acrylic latex.
The invention also provides the high-whiteness yellowing-resistant coated white cardboard prepared by the preparation method.
The invention provides a preparation method of a high-whiteness yellowing-resistant coated white cardboard, which comprises the following steps: s1) slurry treatment: mixing bleached sulfate hardwood pulp with a first biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain a hardwood fiber pulp; mixing bleached sulfate softwood pulp with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain softwood fiber pulp; or mixing the mixed wood pulp of the bleached sulfate broad leaves and the bleached sulfate coniferous leaves with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain mixed fiber pulp; the first and second biological enzymes are each independently selected from cellulases and/or hemicellulases; s2) mixing one or more of the broadleaf fiber pulp, the needle-leaf fiber pulp and the mixed fiber pulp to obtain surface layer pulp; mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp with a fluorescent whitening agent to obtain core layer pulp; mixing one or more of broad-leaved fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain bottom layer pulp; and the surface layer slurry, the core layer slurry and the bottom layer slurry all contain broadleaf fibers and coniferous fibers, wherein the mass ratio of the broadleaf fibers to the coniferous fibers is (60-90): (10-40); s3) respectively dehydrating the surface layer slurry, the core layer slurry and the bottom layer slurry, and carrying out composite forming to obtain the high-whiteness yellowing-resistant coated ivory board. Compared with the prior art, the method has the advantages that wood pulp is pretreated by using the biological enzyme, so that the pulping degree of the pulp can be greatly reduced, the pulping energy consumption is reduced, the paper whiteness can be indirectly improved by improving the opacity of the pulp, the bulk of the paper can be improved on the premise of ensuring the strength index of the paper, the dependence on mechanical pulp is greatly reduced, bleached sulfate hardwood pulp and bleached sulfate softwood pulp with higher whiteness and higher affinity can be used, and the use of fluorescent whitening agents in the pulp is reduced; the fluorescent whitening agent is added into the core layer slurry, so that the whitening effect can be improved, the using amount of the fluorescent whitening agent is reduced, the rapid adjustment of the whiteness of the base paper is realized, and a fiber layer with uniform and stable whiteness is obtained; the adjustment ensures that the fluorescent whitening agent for the white cardboard prepared by the invention has the advantages of small using amount, high whiteness and hue adjusting speed, stable control, natural and soft appearance under ultrahigh whiteness, smooth and exquisite printing surface, good yellowing resistance, low smell, high strength, good toughness and excellent printability.
Further, the fluorescent whitening agent is added into the surface sizing material, so that the fluorescent whitening agent can be well remained on the surface of paper, the whiteness of the surface of the paper is further increased, the dependence on the fluorescent whitening agent in the pulp is reduced, the influence of the fluorescent whitening agent in the pulp on a system is reduced, and the raw paper layer with high whiteness is obtained.
Further, the present invention uses one or more of vinyl acetate-ethylene copolymer latex, polyvinyl acetate latex, and styrene-n-butylacrylic latex in the coating layer, which can reduce paper odor, improve the yellowing resistance of the coating layer, and maintain high surface strength.
Drawings
Fig. 1 is a schematic structural view of a high-whiteness coated ivory board provided by the present invention;
FIG. 2 is a schematic flow chart of the preparation of the high whiteness yellowing resistant coated white cardboard according to example 1 of the present invention;
FIG. 3 is a schematic flow chart of the preparation of the high whiteness yellowing resistant coated ivory board of example 2 of the present invention;
FIG. 4 is a schematic flow chart of a process for preparing a high whiteness yellowing-resistant coated ivory board according to example 3 of the present invention;
fig. 5 is a schematic view of a preparation process of the general high whiteness coated ivory board of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
The invention provides a preparation method of a high-whiteness coated yellowing-resistant white cardboard, which comprises the following steps: s1) slurry treatment: mixing bleached sulfate hardwood pulp with a first biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain a hardwood fiber pulp; mixing bleached sulfate softwood pulp with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain softwood fiber pulp; or mixing the mixed wood pulp of the bleached sulfate broad leaves and the bleached sulfate coniferous leaves with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain mixed fiber pulp; the first and second biological enzymes are each independently selected from cellulases and/or hemicellulases; s2) mixing: mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain surface layer pulp; mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp with a fluorescent whitening agent to obtain core layer pulp; mixing one or more of broad-leaved fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain bottom layer pulp; and the surface layer slurry, the core layer slurry and the bottom layer slurry all contain broadleaf fibers and coniferous fibers, wherein the mass ratio of the broadleaf fibers to the coniferous fibers is (60-90): (10-40); s3) respectively dehydrating the surface layer slurry, the core layer slurry and the bottom layer slurry, and carrying out composite forming to obtain the high-whiteness yellowing-resistant coated ivory board.
In the present invention, the sources of all raw materials are not particularly limited, and they may be commercially available.
The method takes bleached sulfate hardwood pulp and bleached sulfate softwood pulp as raw materials, and pulp treatment is firstly carried out; the bleached sulfate hardwood pulp and bleached sulfate softwood pulp can be treated separately or after being mixed.
Mixing bleached sulfate hardwood pulp with a first biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain a hardwood fiber pulp; the concentration of the bleached sulfate hardwood pulp is preferably 1-10%, more preferably 2-8%, still more preferably 3-6%, and most preferably 4-5%; the first biological enzyme is cellulase and/or hemicellulase, preferably cellulase and/or xylanase, and more preferably xylanase; the dosage of the first biological enzyme is preferably 0.1-1.5 kg/ton of oven-dried pulp, more preferably 0.5-1.5 kg/ton of oven-dried pulp, still more preferably 1-1.5 kg/ton of oven-dried pulp, and most preferably 1.2-1.5 kg/ton of oven-dried pulp; the treatment time is preferably 30-120 min, more preferably 60-120 min, still more preferably 80-120 min, and most preferably 100-120 min; the freeness of the fiber after the treatment of the biological enzyme is adjusted by adjusting the specific power consumption of the pulping equipment. The refining treatment is preferably mechanical refining treatment, more preferably refining by a disc mill, a cone mill or a fluffer, then refining by the disc mill or the cone mill, and most preferably refining by the disc mill; the concentration of the pulp in the pulping treatment is preferably 2.5-5.0%, more preferably 3.0-5.0%, still more preferably 3.5-4.5%, and most preferably 3.9-4.5%; in some embodiments provided by the present invention, the consistency of the pulp at the refining process is preferably 4.25%; in some embodiments provided by the present invention, the consistency of the pulp at the refining process is preferably 4.22%; in some embodiments provided by the present invention, the consistency of the pulp at the refining process is preferably 4.14%; in some embodiments provided by the present invention, the consistency of the pulp at the refining process is preferably 3.92%; in other embodiments provided by the present invention, the consistency of the pulp at the refining process is preferably 4.42%; the freeness of the broadleaf fiber pulp is preferably 350-750 ml, more preferably 500-600 ml, further preferably 500-560 ml, and most preferably 525-546 ml; in some embodiments provided herein, the freeness of the hardwood fiber slurry is preferably 539 ml; in some embodiments provided herein, the hardwood fiber slurry preferably has a freeness of 542 ml; in some embodiments provided herein, the hardwood fiber slurry preferably has a freeness of 531 ml; in some embodiments provided herein, the hardwood slurry preferably has a freeness of 525 ml; in other embodiments provided herein, the hardwood fiber slurry preferably has a freeness of 531 ml; the invention pretreats the pulp by biological enzyme, and can indirectly improve the whiteness of paper by improving the opacity of the pulp.
Mixing bleached sulfate softwood pulp with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain softwood fiber pulp; the concentration of the bleached sulfate softwood pulp is preferably 1-10%, more preferably 2-8%, still more preferably 3-6%, and most preferably 4-5%; the second biological enzyme is cellulase and/or hemicellulase, preferably cellulase and/or xylanase, and more preferably xylanase; the dosage of the second biological enzyme is preferably 0.1-1.5 kg/ton of oven-dried pulp, more preferably 0.5-1.5 kg/ton of oven-dried pulp, still more preferably 1-1.5 kg/ton of oven-dried pulp, and most preferably 1.2-1.5 kg/ton of oven-dried pulp; the treatment time is preferably 30-120 min, more preferably 60-120 min, still more preferably 80-120 min, and most preferably 100-120 min; the refining treatment is preferably mechanical refining treatment, more preferably refining by a disc mill, a cone mill or a fluffer, then refining by the disc mill or the cone mill, and most preferably refining by the disc mill; the concentration of the pulp in the pulping treatment is preferably 2.5-5.0%, more preferably 3.0-5.0%, still more preferably 3.5-4.5%, and most preferably 3.8-4.02%; the freeness of the coniferous fiber pulp is preferably 350-750 ml, more preferably 500-600 ml, even more preferably 500-580 ml, and most preferably 566-580 ml; in some embodiments provided herein, the freeness of the softwood fiber slurry is preferably 566 ml; in other embodiments provided herein, the freeness of the softwood fiber slurry is preferably 580 ml.
Or mixing the mixed wood pulp of the bleached sulfate broad leaves and the bleached sulfate coniferous leaves with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain mixed fiber pulp; the concentration of the mixed wood pulp is preferably 1-10%, more preferably 2-8%, still more preferably 3-6%, and most preferably 4-5%; the bleaching sulfate hardwood pulp is obtained by diluting and disintegrating bleached sulfate hardwood pulp and bleached sulfate softwood pulp; the preferable ratio of the bleached sulfate broad leaves to the bleached sulfate needle leaves in the mixed pulp is (60-90) in absolute dry mass ratio: (10-40), more preferably (60-80): (20-40), and more preferably (65-75): (25-35), most preferably 70: 30, of a nitrogen-containing gas; the second biological enzyme is cellulase and/or hemicellulase, preferably cellulase and/or xylanase, and more preferably xylanase; the dosage of the second biological enzyme is preferably 0.1-1.5 kg/ton of oven-dried pulp, more preferably 0.5-1.5 kg/ton of oven-dried pulp, still more preferably 1-1.5 kg/ton of oven-dried pulp, and most preferably 1.2-1.5 kg/ton of oven-dried pulp; the treatment time is preferably 30-120 min, more preferably 60-120 min, still more preferably 80-120 min, and most preferably 100-120 min; the refining treatment is preferably mechanical refining treatment, more preferably refining by a disc mill, a cone mill or a fluffer, then refining by the disc mill or the cone mill, and most preferably refining by the disc mill; the concentration of the pulp in the pulping treatment is preferably 2.5-5.0%, more preferably 3.0-5.0%, still more preferably 3.5-4.5%, and most preferably 3.8-4.02%; the freeness of the mixed fiber slurry is preferably 350-750 ml, more preferably 500-600 ml, still more preferably 500-580 ml, still more preferably 550-560 ml, and most preferably 558.
Mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain surface layer pulp; the mass ratio of the broad leaf fibers to the coniferous fibers in the surface layer sizing agent is (60-90): (10-40), more preferably (60-80): (20-40), and more preferably (65-75): (25-35), most preferably 70: 30.
mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp with a fluorescent whitening agent to obtain core layer pulp; the mass ratio of the broad leaf fibers to the coniferous fibers in the core layer slurry is (60-90): (10-40), more preferably (70-90): (10-30), and more preferably (80-90): (10-20), most preferably 90: 10; the fluorescent whitening agent is preferably one or more of disulfonic acid fluorescent whitening agents, tetrasulfonic acid fluorescent whitening agents and hexasulfonic acid fluorescent whitening agents; the amount of the fluorescent whitening agent is preferably 0.5-10 kg/ton of paper, more preferably 1-8 kg/ton of paper, even more preferably 2-5 kg/ton of paper, and most preferably 2-3 kg/ton of paper.
Mixing one or more of broad-leaved fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain bottom layer pulp; the mass ratio of the broad leaf fibers to the coniferous fibers in the bottom layer slurry is (60-90): (10-40), more preferably (70-90): (30-10), and more preferably (75-85): (15-25), most preferably 80: 20.
when the pulp of each layer is the broadleaf fiber pulp and the softwood fiber pulp and then mixed pulp making is carried out, in order to further improve the whiteness of the core layer, the broadleaf fiber pulp comprises a first broadleaf fiber pulp and a second broadleaf fiber pulp; the first hardwood fiber pulp is obtained by mixing bleached sulfate hardwood pulp with a first biological enzyme, treating for 30-110 min and then carrying out pulp grinding treatment; the second hardwood fiber pulp is obtained by mixing bleached sulfate hardwood pulp with the first biological enzyme, treating for 40-120 min and then carrying out pulp grinding treatment; the parameters of the enzyme treatment and the pulping treatment are the same as those described above, except that the time difference between the second hardwood fiber pulp and the first hardwood fiber pulp in the preparation of the first hardwood fiber pulp is preferably 5-20 min, more preferably 8-15 min, still more preferably 8-12 min, and most preferably 10 min. The method is characterized in that the broadleaf fiber pulp with long time of biological enzyme treatment is adopted to provide broadleaf fibers for the core layer.
When the respective layers of pulp provide the hardwood and softwood fibers from the mixed fiber pulp, the mixed fiber pulp may be used alone, or may be mixed with either the hardwood or softwood fiber pulps depending on the ratio of the hardwood to softwood fibers therein.
Namely: mixing one or more of the first broadleaf fiber pulp, the first needle leaf fiber pulp and the mixed pulp to obtain surface layer pulp; mixing one or more of the second broadleaf fiber pulp, the second softwood fiber pulp and the mixed pulp with a fluorescent whitening agent to obtain core layer pulp; or mixing the first broadleaf fiber pulp or the second fiber pulp, the mixed fiber pulp and the fluorescent whitening agent to obtain core layer pulp; and mixing the first broadleaf fiber pulp, the second broadleaf fiber pulp and one or more of the mixed fiber pulps to obtain the bottom layer pulp.
The fluorescent whitening agent is added into the core layer flow system, the whitening effect of the fluorescent whitening agent is improved, the using amount of the fluorescent whitening agent is reduced, the whiteness of the base paper is rapidly adjusted through the optimization of the type and the addition point of the fluorescent whitening agent, and the fiber layer with uniform and stable whiteness is obtained.
Respectively dehydrating the surface layer slurry, the core layer slurry and the bottom layer slurry, and then carrying out composite molding; preferably drying after molding to obtain a fiber layer which comprises a surface layer, a core layer and a bottom layer; the proportion of the surface layer quantitative weight to the fiber layer (i.e. the surface layer, the core layer and the bottom layer) quantitative weight is preferably 17-25%, and more preferably 19-22%; in some embodiments provided herein, the face layer basis weight comprises 21.8% of the fibrous layer basis weight; in some embodiments provided herein, the face layer basis weight comprises 20.2% of the fibrous layer basis weight; in other embodiments provided herein, the face layer basis weight comprises 19.8% of the fibrous layer basis weight; the proportion of the core layer ration in the fiber layer ration is preferably 55-65%, more preferably 57-60%; in some embodiments provided herein, the core basis weight is 61.2% of the basis weight proportion of the fibrous layer; in some embodiments provided herein, the core basis weight comprises 64.4% of the basis weight proportion of the fibrous layer; in other embodiments provided herein, the core basis weight comprises 65.2% of the basis weight proportion of the fibrous layer; the ratio of the bottom layer basis weight to the fiber layer basis weight is preferably 14% -20%, more preferably 15% -17%; in some embodiments provided herein, the basis weight comprises 17% of the basis weight of the fibrous layer; in some embodiments provided herein, the basis weight comprises 15.4% of the basis weight proportion of the fibrous layer; in other embodiments provided herein, the basis weight comprises 15% of the basis weight of the fibrous layer.
In the present invention, it is preferable to perform surface sizing of the top layer and/or surface sizing of the bottom layer on the surface of the top layer and/or the surface of the bottom layer; the sizing materials used for surface sizing of the surface layer and surface sizing of the bottom layer comprise starch, water and fluorescent whitening agent; the mass ratio of starch to water in the surface sizing material is preferably (5-20): (80-95), more preferably (8-16): (84-92), more preferably (10-12): (88-90), most preferably 11: 89; the addition amount of the fluorescent whitening agent in the surface sizing material of the surface layer is preferably 1-8 kg/ton paper, and more preferably 1-6 kgPer ton of paper, more preferably 1 to 3kg per ton of paper, and most preferably 1.3 to 2kg per ton of paper; the surface sizing amount of the surface layer is preferably 1-4 g/m2More preferably 1.5 to 3g/m2More preferably 2 to 3g/m2Most preferably 2.3 to 2.4g/m2(ii) a The mass ratio of starch to water in the bottom surface sizing material is preferably (5-20): (80-95), more preferably (8-16): (84-92); the addition amount of the fluorescent whitening agent in the bottom surface sizing material is preferably 1-8 kg/ton of paper, more preferably 1-6 kg/ton of paper, further preferably 1-3 kg/ton of paper, and most preferably 1.3-2 kg/ton of paper; the preferable surface sizing amount of the bottom layer is 1-4 g/m2More preferably 1.5 to 3g/m2More preferably 2 to 3g/m2Most preferably 2.3 to 2.4g/m2(ii) a The raw paper layer is obtained after sizing; the preferred quantitative ratio of the white cardboard raw paper layer provided by the invention is 140-350 g/m2。
Finally, coating paint on the surface sizing layer of the surface layer to form a coating layer, so as to obtain the high-whiteness coated white cardboard; the coating preferably comprises 40-60 parts by weight of calcium carbonate, 3-10 parts by weight of china clay, 2-5 parts by weight of styrene-butadiene latex, 1-7 parts by weight of latex, 0-3 parts by weight of starch, 0-1 part by weight of fluorescent whitening agent and 30-40 parts by weight of water; more preferably, the coating comprises 45-55 parts by weight of calcium carbonate, 4-8 parts by weight of china clay, 3-5 parts by weight of styrene-butadiene latex, 2-5 parts by weight of latex, 0-2 parts by weight of starch, 0.1-0.5 part by weight of fluorescent whitening agent and 30-40 parts by weight of water; preferably 45-55 parts by weight of calcium carbonate, 4-8 parts by weight of china clay, 4-5 parts by weight of styrene-butadiene latex, 2-3 parts by weight of latex, 0-2 parts by weight of starch, 0.1-0.3 part by weight of fluorescent whitening agent and 30-40 parts by weight of water; most preferably 53.8 parts by weight calcium carbonate, 6 parts by weight china clay, 4.8 parts by weight styrene butadiene latex, 2.1 parts by weight latex, 1.3 parts by weight starch, 0.2 parts by weight optical brightener and 31.8 parts by weight water; the latex is selected from one or more of vinyl acetate-ethylene copolymer latex, polyvinyl acetate latex and styrene-n-butyl acrylic latex; the coating layer preferably has a basis weight of 10 to 40g/m2。
According to the invention, wood pulp is pretreated by using biological enzyme, so that the pulping degree of pulp can be greatly reduced, the pulping energy consumption is reduced, the paper whiteness can be indirectly improved by improving the opacity of the pulp, the bulk of the paper can be improved on the premise of ensuring the strength index of the paper, the dependence on mechanical pulp is greatly reduced, bleached sulfate hardwood pulp and bleached sulfate softwood pulp with higher whiteness and higher affinity can be used, and the use of a fluorescent whitening agent is reduced; the fluorescent whitening agent is added into the core layer slurry, so that the whitening effect can be improved, the using amount of the fluorescent whitening agent is reduced, the rapid adjustment of the whiteness of the base paper is realized, and a fiber layer with uniform and stable whiteness is obtained; the adjustment ensures that the fluorescent whitening agent for the white cardboard prepared by the invention has the advantages of small using amount, high whiteness and hue adjusting speed, stable control, natural and soft appearance under ultrahigh whiteness, smooth and exquisite printing surface, good yellowing resistance, low smell, high strength, good toughness and excellent printability.
Further, the fluorescent whitening agent is added into the surface sizing material, so that the fluorescent whitening agent can be well remained on the surface of paper, the whiteness of the surface of the paper is further increased, the dependence on the fluorescent whitening agent in the pulp is reduced, the influence of the fluorescent whitening agent in the pulp on a system is reduced, and the raw paper layer with high whiteness is obtained.
Further, the present invention uses one or more of vinyl acetate-ethylene copolymer latex, polyvinyl acetate latex, and styrene-n-butylacrylic latex in the coating layer, which can reduce paper odor, improve the yellowing resistance of the coating layer, and maintain high surface strength.
The invention also provides the high-whiteness yellowing-resistant coated white cardboard prepared by the method.
Referring to fig. 1, fig. 1 is a schematic structural view of the high whiteness yellowing resistant coated ivory board provided by the present invention, wherein 101 is a bottom layer sizing layer, 102 is a bottom layer, 103 is a core layer, 104 is a surface layer, 105 is a surface layer sizing layer, and 106 is a coating layer.
In order to further illustrate the present invention, the following will describe in detail a high whiteness yellowing resistant coated white cardboard and a method for preparing the same, which are provided by the present invention, with reference to the following examples.
The reagents used in the following examples are all commercially available.
Example 1
The manufacturing process shown in fig. 2 includes the following steps:
1) fiber treatment
Bleached sulfate hardwood pulp 1: diluting and disintegrating the air-dried bleached sulfate hardwood pulp board in a pulper 1 according to the concentration of 5%, adding 1.5 kg/ton of oven-dried pulp cellulose into a pre-grinding pool 1 based on oven-dried pulp, carrying out bio-enzyme treatment on the pulp in the pre-grinding pool 1 for 100min, adjusting the concentration to be 4.25% of pulp grinding concentration, sending the pulp to the refiner 1 for pulp grinding treatment, and controlling the freeness 539ml after pulp grinding to obtain the fiber 1.
Bleached sulfate hardwood pulp 2: diluting and disintegrating the air-dried bleached sulfate hardwood pulp board in a pulper 2 according to the concentration of 5%, adding 1.5 kg/ton of oven-dried cellulose in a pre-grinding pool 2 according to the oven-dried pulp, carrying out bio-enzyme treatment on the pulp in the pre-grinding pool 2 for 110min, adjusting the concentration to 4.22% of pulp concentration, sending the pulp to a disc grinder 2 for grinding, and controlling the freeness after grinding to be 542ml to obtain the fiber 2.
Bleaching sulfate softwood pulp: diluting and disintegrating the air-dried bleached sulfate softwood pulp board in a pulper 3 according to the concentration of 5%, adding 1.5 kg/ton of oven-dried cellulose in a pre-grinding pool 3 based on the oven-dried pulp, carrying out bio-enzyme treatment on the pulp in the pre-grinding pool 3 for 120min, adjusting the concentration to 3.80% of the pulp concentration, sending the pulp to a cone mill refiner for refining, and controlling the freeness of the refined pulp to be 566ml to obtain the fiber 3.
2) Preparing a raw paper layer:
surface layer slurry: the whole proportioning proportion of various fibers is 70 percent of fiber 1 and 30 percent of fiber 3 by mass percent, and the fibers enter a surface layer net of a paper machine for dehydration through a surface layer pulp mixing tank and a surface layer paper machine pulp tank.
Core layer slurry: the whole proportioning of various fibers is 90 percent of fiber 2 and 10 percent of fiber 3 by mass percent, the fibers pass through a core layer pulp mixing tank, 3.8 kg/ton of disulfonic acid liquid fluorescent whitening agent is added into a core layer paper machine pulp tank by mass percent of absolute dry core layer pulp, the mixture enters a core layer net of a paper machine for dehydration, and the dosage of the fluorescent whitening agent in the disulfonic acid pulp finally formed into paper is about 2.1kg/t of paper.
Bottom layer slurry: the whole batching proportion of various fibers is 80 percent of fiber 1 and 20 percent of fiber 3 in percentage by mass, and the fibers enter a bottom layer net of a paper machine for dehydration through a bottom layer pulp mixing tank and a bottom layer paper machine pulp tank.
And then, carrying out three-layer laminating and addition molding treatment by a fourdrinier machine to produce a wet paper sheet with a 104 surface layer, a 103 core layer and a 102 bottom layer, and drying the wet paper sheet to obtain a fiber layer. Controlling the proportion of the surface layer ration to the fiber layer ration to be 21.8%; the core layer accounts for 61.2% of the fiber layer in terms of basis weight; the basis weight accounts for 17% of the basis weight of the fibrous layer.
The tetrasulfonic acid liquid fluorescent whitening agent was pumped into each of the front surface sizing tank and the back surface sizing tank at a flow rate of 600ml/min, and mixed with an aqueous dispersion of surface sizing starch (starch concentration: 11%) to perform front surface sizing and back surface sizing of the paper sheet, thereby obtaining front surface sizing 105 and back surface sizing 101. Wherein the front surface sizing amount is controlled to be 2.4g/m2The back surface sizing amount is 2.3g/m2The amount of optical brightener finally applied to the paper at the reeling section by surface sizing was 1.3kg per ton of paper on the front and 1.3kg per ton of paper on the back.
3) According to the mass percentage, 53.8 percent of calcium carbonate, 6 percent of china clay, 4.8 percent of styrene-butadiene latex, 2.1 percent of vinyl acetate-ethylene copolymer latex, 1.3 percent of starch, 0.2 percent of fluorescent whitening agent and 31.8 percent of water are prepared into the coating layer coating by a conventional white card coating preparation method.
Coating the coating layer by a scraper, coating the coating layer on the front surface of the raw paper layer, and quantifying the coating layer to 25g/m2. And then dried with hot air to form the coating layer 106.
Finally, the high-whiteness anti-yellowing coated white cardboard shown in fig. 1 is formed, and comprises a back surface sizing layer 101, a fiber layer bottom layer 102, a fiber layer core layer 103, a fiber layer surface layer 104, a front surface sizing layer 105 and a coating layer 106.
The prepared high-whiteness yellowing-resistant coated white cardboard is compared with the common high-whiteness coated white cardboard, and the data are shown in tables 1 and 2.
TABLE 1 white cardboard composition comparison
Figure BDA0002390216210000131
Table 2 physical property test comparison results
Figure BDA0002390216210000132
As can be seen from the data in table 1, the white cardboard prepared in example 1 has not only a basis weight, thickness, stiffness, water absorption, gloss, interlayer bonding strength similar to those of the ordinary high whiteness coated white cardboard, but also higher whiteness, folding endurance, printing surface strength, and lower surface roughness compared to the ordinary high whiteness coated white cardboard. The white cardboard prepared in example 1 can be used to obtain the white cardboard with high whiteness similar to or better than the common white cardboard.
Example 2
The manufacturing process shown in fig. 3 includes the following steps:
1) fiber treatment
Bleached sulfate hardwood pulp 1: diluting and disintegrating the air-dried bleached sulfate hardwood pulp board in a pulper 1 according to the concentration of 5%, adding 1.5 kg/ton of oven-dried cellulose in a pre-grinding pool 1 based on oven-dried pulp, carrying out bio-enzyme treatment on the pulp in the pre-grinding pool 1 for 100min, adjusting the concentration to 4.14% of pulp grinding concentration, sending the pulp to a disc grinder 1 for pulp grinding treatment, and controlling the freeness after pulp grinding to be 531ml to obtain the fiber 1.
Bleached sulfate hardwood pulp 2: diluting and disintegrating the air-dried bleached sulfate hardwood pulp board in a pulper 2 according to the concentration of 5%, adding 1.5 kg/ton of oven-dried cellulose in a pre-grinding pool 2 according to the oven-dried pulp, carrying out bio-enzyme treatment on the pulp in the pre-grinding pool 2 for 110min, adjusting the concentration to 3.92% of pulp concentration, sending the pulp to a disc grinder 2 pulping machine for pulping treatment, and controlling the freeness of the pulp after pulping to 525ml to obtain the fiber 2.
Bleaching sulfate softwood pulp: diluting and disintegrating the air-dried bleached sulfate softwood pulp board in a pulper 3 according to the concentration of 5%, adding 1.5 kg/ton of oven-dried cellulose in a pre-grinding pool 3 based on the oven-dried pulp, carrying out bio-enzyme treatment on the pulp in the pre-grinding pool 3 for 120min, adjusting the concentration to 4.02% of the pulp concentration, sending the pulp to a cone mill refiner for refining, and controlling the freeness 580ml after refining to obtain the fiber 3.
2) Preparing a raw paper layer:
surface layer slurry: the whole proportioning proportion of various fibers is 70 percent of fiber 1 and 30 percent of fiber 3 in percentage by mass, and the fibers enter a surface layer net of a paper machine for dehydration through a surface layer pulp mixing tank and a surface layer paper machine pulp tank.
Core layer slurry: according to the mass percentage, the whole batching proportion of various fibers is 90% of fiber 2 and 10% of fiber 3, according to the absolute dry mass percentage of the pulp of the core layer, 0.07 kg/ton purple dye and 0.04 kg/ton blue dye are added into a pulp mixing tank of the core layer, 4.5 kg/ton disulfonic acid liquid fluorescent whitening agent is added into a pulp tank of a paper machine of the core layer, the disulfonic acid liquid fluorescent whitening agent enters a net of the paper machine of the core layer for dehydration, and the dosage of the fluorescent whitening agent in the disulfonic acid pulp of the final finished paper is about 2.6kg/t paper.
Bottom layer slurry: the whole batching proportion of various fibers is 80 percent of fiber 1 and 20 percent of fiber 3 in percentage by mass, and the fibers enter a bottom layer net of a paper machine for dehydration through a bottom layer pulp mixing tank and a bottom layer paper machine pulp tank.
And then, carrying out three-layer laminating and addition molding treatment by a fourdrinier machine to produce a wet paper sheet with a 104 surface layer, a 103 core layer and a 102 bottom layer, and drying the wet paper sheet to obtain a fiber layer. Controlling the proportion of the surface layer ration to the fiber layer ration to be 20.2%; the proportion of the core layer ration to the fiber layer ration is 64.4%; the basis weight accounts for 15.4% of the basis weight of the fibrous layer.
Pumping tetrasulfonic acid liquid fluorescent whitening agent into the front surface sizing material tank and the back surface sizing material tank at a flow rate of 500ml/min respectively, mixing with the aqueous dispersion of surface sizing starch (starch concentration is 11%), and performing front surface sizing and back surface sizing of the paperThe front surface sizing 105 and the back surface sizing 101 are obtained. Wherein the front surface sizing amount is controlled to be 2.4g/m2The back surface sizing amount is 2.3g/m2The amount of optical brightener ultimately applied to the paper at the reeling section by surface sizing was 1.1kg per ton of paper on the front and 1.1kg per ton of paper on the back.
3) According to the mass percentage, 53.8 percent of calcium carbonate, 6 percent of china clay, 4.8 percent of styrene-butadiene latex, 2.1 percent of vinyl acetate-ethylene copolymer latex, 1.3 percent of starch, 0.1 percent of fluorescent whitening agent and 32.1 percent of water are prepared into the coating layer coating by a conventional white card coating preparation method.
Coating the coating layer by a scraper, coating the coating layer on the front surface of the raw paper layer, and quantifying the coating layer to 25g/m2. And then dried by hot air to form the coating layer 105.
Finally, the high-whiteness anti-yellowing coated white cardboard shown in fig. 1 is formed, and comprises a back surface sizing layer 101, a fiber layer bottom layer 102, a fiber layer core layer 103, a fiber layer surface layer 104, a front surface sizing layer 105 and a coating layer 106.
The prepared high whiteness yellowing resistant coated white cardboard is compared with the common high whiteness coated white cardboard, and the data are shown in tables 3 and 4.
TABLE 3 white cardboard composition comparison
Figure BDA0002390216210000151
Figure BDA0002390216210000161
TABLE 4 comparison results of physical Properties measurement
Figure BDA0002390216210000162
Example 3
According to the manufacturing flow shown in fig. 4, the method comprises the following steps:
1) fiber treatment
Bleaching sulfate hardwood pulp: diluting and disintegrating the air-dried bleached sulfate hardwood pulp board in a pulper 1 according to the concentration of 5%, adding 1.5 kg/ton of oven-dried cellulose in a pre-grinding pool 1 based on oven-dried pulp, carrying out bio-enzyme treatment on the pulp in the pre-grinding pool 1 for 100min, adjusting the concentration to 4.42% of grinding concentration, sending the pulp to a disc grinder 1 for grinding, and controlling the freeness after grinding to 546ml to obtain the fiber 1. .
Bleached sulfate hardwood pulp, bleached sulfate softwood pulp: air-dried bleached sulfate hardwood pulp sheets, bleached sulfate softwood pulp sheets were mixed at a ratio of 70%: 30 percent of the pulp is put into a pulper 2 according to the mass ratio, the pulp is diluted and decomposed in the pulper 2 according to the concentration of 5 percent, 1.5 kg/ton of oven dry pulp cellulose is added into a pre-grinding pool 2 according to the oven dry pulp, the pulp is sent to a disc grinder 2 pulping machine for pulping treatment after the concentration is adjusted to 3.80 percent of pulping concentration after being treated by biological enzyme in the pre-grinding pool 2 for 100min, and the freeness is controlled to be 558ml after the pulping, so that the fiber 2 is obtained.
2) Preparing a raw paper layer:
surface layer slurry: the whole batching proportion of the fiber is 100 percent of fiber 2 by mass percent, and the fiber enters a surface layer net of a paper machine for dehydration through a surface layer pulp mixing tank and a surface layer paper machine pulp tank.
Core layer slurry: according to the mass percent, the integral batching proportion of various fibers is 67 percent of fiber 1 and 33 percent of fiber 2, according to the absolute dry mass percent of the pulp of the core layer, 0.07 kg/ton purple dye and 0.04 kg/ton blue dye are added into a pulp mixing tank of the core layer, 3.8 kg/ton disulfonic acid liquid fluorescent whitening agent is added into a pulp tank of a paper machine of the core layer, the disulfonic acid liquid fluorescent whitening agent enters a net of the paper machine of the core layer for dehydration, and the dosage of the fluorescent whitening agent in the disulfonic acid pulp of the final finished paper is about 2.2kg/t paper.
Bottom layer slurry: the whole batching proportion of various fibers is 50 percent of fiber 1 and 50 percent of fiber 2 in percentage by mass, and the fibers enter a bottom layer net of a paper machine through a bottom layer pulp mixing tank and a bottom layer paper machine pulp tank to be dewatered.
And then, carrying out three-layer laminating and addition molding treatment by a fourdrinier machine to produce a wet paper sheet with a 104 surface layer, a 103 core layer and a 102 bottom layer, and drying the wet paper sheet to obtain a fiber layer. Controlling the proportion of the surface layer ration to the fiber layer ration to be 19.8%; the proportion of the core layer ration to the fiber layer ration is 65.2%; the basis weight accounts for 15% of the basis weight of the fibrous layer.
The tetrasulfonic acid liquid fluorescent whitening agent was pumped into each of the front surface sizing tank and the back surface sizing tank at a flow rate of 600ml/min, and mixed with an aqueous dispersion of surface sizing starch (starch concentration: 11%) to perform front surface sizing and back surface sizing of the paper sheet, thereby obtaining front surface sizing 105 and back surface sizing 101. Wherein the front surface sizing amount is controlled to be 2.4g/m2The back surface sizing amount is 2.3g/m2The amount of optical brightener finally applied to the paper at the reeling section by surface sizing was 1.3kg per ton of paper on the front and 1.3kg per ton of paper on the back.
3) According to the formula of the coating, 53.8% of calcium carbonate, 6% of china clay, 3.6% of styrene-butadiene latex, 4.8% of polyvinyl acetate latex, 0.2% of fluorescent whitening agent and 31.6% of water are prepared into the coating layer coating by a conventional white card coating preparation method.
Coating the coating layer by a scraper, coating the coating layer on the front surface of the raw paper layer, and quantifying the coating layer by 24g/m2. And then dried with hot air to form the coating layer 106.
Finally, the high-whiteness anti-yellowing coated white cardboard shown in fig. 1 is formed, and comprises a back surface sizing layer 101, a fiber layer bottom layer 102, a fiber layer core layer 103, a fiber layer surface layer 104, a front surface sizing layer 105 and a coating layer 106.
The prepared high whiteness yellowing resistant coated white cardboard is compared with the common high whiteness coated white cardboard, and the data are shown in tables 5 and 6.
TABLE 5 white cardboard composition comparison
Figure BDA0002390216210000181
TABLE 6 comparison results of physical Properties measurement
Figure BDA0002390216210000182
Figure BDA0002390216210000191
The hue, heat resistance and light-induced yellowing data of the white cardboards obtained in examples 1 to 3 are shown in table 7.
TABLE 7 color and heat-resistant, light-induced yellowing data of ivory paper of each example
Figure BDA0002390216210000192
As can be seen from the data in table 7, the yellowing degree of the white cardboard prepared in 3 examples under light induction and heat induction is much lower than that of the common high-whiteness coated white cardboard.
Table 1-table 7 shows the manufacturing process of the common high whiteness coated white cardboard
The manufacturing process shown in fig. 5 includes the following steps:
1) fiber treatment
Bleaching sulfate hardwood pulp: diluting and disintegrating the air-dried bleached sulfate hardwood pulp board in a pulper 1 according to the concentration of 5%, adjusting the concentration to the pulping concentration of 4.21%, sending the pulp to a disc mill refiner for refining, and controlling the freeness of 378ml after refining to obtain the fiber 1.
Bleached thermomechanical pulp (CTMP): and (3) diluting and disintegrating the air-dried CTMP pulp board in a pulper 2 according to the concentration of 5%, adjusting the concentration to 4.22% of the refining concentration, feeding the pulp into a fluffer for refining, and obtaining the fiber 2 after refining with the freeness of 402 ml.
Bleaching sulfate softwood pulp: the air-dried bleached sulfate softwood pulp board is diluted and disintegrated in a pulper 3 according to the concentration of 5%, the bleached sulfate softwood pulp board is sent to a cone mill refiner for refining treatment after the concentration is adjusted to be 4.02% of refining concentration, and the freeness after refining is controlled to be 384ml, so that the fiber 3 is obtained.
2) Preparing a raw paper layer:
surface layer slurry: the whole proportioning of each fiber is 80 percent of fiber 1 and 20 percent of fiber 3 by mass percent, the fiber passes through a surface layer pulp mixing tank, 4.5 kg/ton of disulfonic acid liquid fluorescent whitening agent is added into the surface layer paper machine pulp tank by mass percent of absolute dry surface layer pulp, and the fiber enters a paper machine surface layer net for dehydration through the surface layer paper machine pulp tank.
Core layer slurry: the whole proportioning of various fibers is 70 percent of fiber 2 and 30 percent of fiber 1 by mass percent, the fibers pass through a core layer pulp mixing tank, 6.1 kg/ton of disulfonic acid liquid fluorescent whitening agent is added into the core layer paper machine pulp tank by mass percent of oven dry core layer pulp, and the fibers enter a core layer net of a paper machine for dehydration.
Bottom layer slurry: according to the mass percentage, the whole batching proportion of various fibers is 85% of fiber 1 and 15% of fiber 3, 5.7 kg/ton of disulfonic acid type liquid fluorescent whitening agent is added into a bottom layer paper machine pulp tank through a bottom layer pulp mixing tank according to the oven dry mass percentage of bottom layer pulp, and the mixture enters a bottom layer net of a paper machine through the bottom layer paper machine pulp tank for dehydration.
The amount of optical brightener in the final paper-making disulfonic acid pulp was about 5.2kg/t paper.
And then, carrying out three-layer laminating and addition molding treatment by a fourdrinier machine to produce a wet paper sheet with a 104 surface layer, a 103 core layer and a 102 bottom layer, and drying the wet paper sheet to obtain a fiber layer. Controlling the proportion of the surface layer ration to the fiber layer ration to be 22.2%; the proportion of the core layer ration to the fiber layer ration is 62.3%; the basis weight accounts for 15.5% of the basis weight of the fibrous layer.
The paper was subjected to surface sizing on the front side and surface sizing on the back side with an aqueous dispersion of surface sizing starch (starch concentration: 11%) to obtain a front side surface sizing 105 and a back side surface sizing 101. Wherein the front surface sizing amount is controlled to be 2.3g/m2The back surface sizing amount is 2.5g/m2。
3) According to the formula of the coating, 53.8% of calcium carbonate, 6% of china clay, 6.9% of styrene-butadiene latex, 1.3% of starch, 0.4% of fluorescent whitening agent and 31.6% of water are prepared into the coating layer coating by a conventional white card coating preparation method.
Coating the coating layer by a scraper, coating the coating layer on the front surface of the raw paper layer, and quantifying the coating layer to 25g/m2. And then dried with hot air to form the coating layer 106.
Finally, the high-whiteness coated ivory board as shown in fig. 1 is formed, and comprises a back surface sizing layer 101, a fiber layer bottom layer 102, a fiber layer core layer 103, a fiber layer surface layer 104, a front surface sizing layer 105 and a coating layer 106.

Claims (8)

1. A preparation method of a high-whiteness yellowing-resistant coated white cardboard is characterized by comprising the following steps:
s1) slurry treatment:
mixing bleached sulfate hardwood pulp with a first biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain a hardwood fiber pulp;
mixing bleached sulfate softwood pulp with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain softwood fiber pulp;
or mixing the mixed wood pulp of the bleached sulfate broad leaves and the bleached sulfate coniferous leaves with a second biological enzyme for treatment, and then carrying out pulp grinding treatment to obtain mixed fiber pulp;
the first and second biological enzymes are each independently selected from cellulases and/or hemicellulases;
s2) mixing:
mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain surface layer pulp;
mixing one or more of broadleaf fiber pulp, coniferous fiber pulp and mixed fiber pulp with a fluorescent whitening agent to obtain core layer pulp;
mixing one or more of broad-leaved fiber pulp, coniferous fiber pulp and mixed fiber pulp to obtain bottom layer pulp;
and the surface layer slurry, the core layer slurry and the bottom layer slurry all contain broadleaf fibers and coniferous fibers, wherein the mass ratio of the broadleaf fibers to the coniferous fibers is (60-90): (10-40);
s3) respectively dehydrating the surface layer slurry, the core layer slurry and the bottom layer slurry, and carrying out composite forming to obtain the high-whiteness yellowing-resistant coated ivory board;
the dosage of the first biological enzyme and the dosage of the second biological enzyme are respectively and independently 0.1-1.5 kg/ton of the absolute dry pulp;
the step S1) of mixing the bleached sulfate hardwood pulp with the first biological enzyme for processing is 30-120 min; the bleached sulfate softwood pulp and the second biological enzyme are mixed for treatment for 30-120 min; or the bleached sulfate hardwood pulp, the bleached sulfate softwood pulp and the second biological enzyme are mixed for treatment for 30-120 min.
2. The method of claim 1 wherein the hardwood slurry comprises a first hardwood slurry and a second hardwood slurry; the first hardwood fiber pulp is obtained by mixing bleached sulfate hardwood pulp with a first biological enzyme, treating for 30-110 min and then carrying out pulp grinding treatment; the second hardwood fiber pulp is obtained by mixing bleached sulfate hardwood pulp with the first biological enzyme, treating for 40-120 min and then carrying out pulp grinding treatment; the time difference between the second broadleaf fiber pulp and the first broadleaf fiber pulp in preparation and the time of the first biological enzyme treatment is 5-20 min.
3. The method according to claim 2, wherein the slurry mixture is:
mixing one or more of the first broadleaf fiber pulp, the first needle leaf fiber pulp and the mixed pulp to obtain surface layer pulp;
mixing one or more of the second broadleaf fiber pulp, the second softwood fiber pulp and the mixed pulp with a fluorescent whitening agent to obtain core layer pulp; or mixing the first broadleaf fiber pulp or the second fiber pulp, the mixed fiber pulp and the fluorescent whitening agent to obtain core layer pulp;
and mixing the first broadleaf fiber pulp, the second broadleaf fiber pulp and one or more of the mixed fiber pulps to obtain the bottom layer pulp.
4. The method as claimed in claim 1, wherein the bleached sulfate hardwood pulp in step S1) is mixed with the first bio-enzyme and treated to have a concentration of 2.5-5.0%; after the bleached sulfate softwood pulp is mixed with the second biological enzyme for treatment, the concentration of the bleached sulfate softwood pulp during pulping treatment is 2.5-5.0%; the concentration of the bleached sulfate hardwood pulp, bleached sulfate softwood pulp and the second biological enzyme is 2.5-5.0% during pulping treatment after being mixed and treated;
the freeness of the broadleaf fiber pulp, the needle-leaf fiber pulp and the mixed fiber pulp in the step S1) is respectively and independently 350-750 ml.
5. The preparation method according to claim 1, characterized in that the amount of the fluorescent whitening agent in the core layer slurry is 0.5-10 kg/ton of paper; the fluorescent whitening agent is selected from one or more of disulfonic acid fluorescent whitening agents, tetrasulfonic acid fluorescent whitening agents and hexasulfonic acid fluorescent whitening agents.
6. The preparation method according to claim 1, wherein after the composite forming in step S3), surface sizing is further performed on the surface of the surface layer and/or the surface of the bottom layer to obtain a high-whiteness coated ivory board; the sizing materials used for surface sizing of the surface layer and surface sizing of the bottom layer comprise starch, water and fluorescent whitening agent; the dosage of the fluorescent whitening agent in the sizing material used for surface sizing of the surface layer and the sizing material used for surface sizing of the bottom layer is 1-8 kg/ton of paper respectively and independently.
7. The preparation method according to claim 6, characterized in that coating is applied on the surface sizing layer of the surface layer to form a coating layer, so as to obtain the high-whiteness coated white cardboard; the coating comprises 40-60 parts by weight of calcium carbonate, 3-10 parts by weight of china clay, 2-5 parts by weight of styrene-butadiene latex, 1-7 parts by weight of latex, 0-3 parts by weight of starch, 0-1 part by weight of fluorescent whitening agent and 30-40 parts by weight of water; the latex is selected from one or more of vinyl acetate-ethylene copolymer latex, polyvinyl acetate latex and styrene-n-butyl acrylic latex.
8. The high-whiteness yellowing-resistant coated white cardboard prepared by the preparation method of any one of claims 1 to 7.
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