CN110886132A - Mildew-proof antibacterial white cardboard and processing technology thereof - Google Patents

Mildew-proof antibacterial white cardboard and processing technology thereof Download PDF

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Publication number
CN110886132A
CN110886132A CN201811056572.6A CN201811056572A CN110886132A CN 110886132 A CN110886132 A CN 110886132A CN 201811056572 A CN201811056572 A CN 201811056572A CN 110886132 A CN110886132 A CN 110886132A
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China
Prior art keywords
parts
pulp
mildew
layer
antibacterial
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李树伟
李建强
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Youyuan Office Alliance Tianjin Co ltd
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Youyuan Office Alliance Tianjin Co ltd
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Priority to CN201811056572.6A priority Critical patent/CN110886132A/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
    • 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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H15/00—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution
    • D21H15/02—Pulp or paper, comprising fibres or web-forming material characterised by features other than their chemical constitution characterised by configuration
    • D21H15/10—Composite fibres
    • 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
    • D21H19/44—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
    • D21H19/46—Non-macromolecular organic 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
    • 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
    • D21H19/52—Cellulose; 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
    • D21H19/36—Coatings with pigments
    • D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
    • D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than 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
    • D21H19/80—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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Paper (AREA)

Abstract

The invention belongs to the technical field of white cardboard processing, and particularly relates to a mildew-proof antibacterial white cardboard which comprises base paper and a coating layer, wherein the coating layer comprises the following raw material components in parts by weight: 50-80 parts of nano calcium carbonate, 1-5 parts of microcrystalline cellulose, 30-50 parts of peach gum, 0.5-3 parts of grapefruit seed extract, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent, and also provides a processing technology of the white cardboard; pure natural plants are used as antibacterial components, and the coating layers are obtained by compounding and coated on the surfaces of the surface layer and the bottom layer, so that the coating has an antibacterial effect, is natural and pollution-free, and has no potential harm to human bodies; the coating layer also improves the moisture resistance of the paper base and effectively avoids the problem of wetting and mildewing.

Description

Mildew-proof antibacterial white cardboard and processing technology thereof
Technical Field
The invention relates to the technical field of white cardboard processing, in particular to a mildew-proof antibacterial white cardboard and a processing technology thereof.
Background
The white cardboard is a kind of white cardboard made of thick, solid and high-quality wood pulp, and is mainly used for packaging and decorating printing stock after being calendered or embossed. Classified according to the application, there are special papers, such as single-coated white cardboard for cigarette packaging, called cigarette card, uncoated base paper for liquid food packaging, called liquid food wrapping paper, various anti-counterfeit label papers, etc. Others are coated white cardboard used for packaging various goods, such as wine bottles, cosmetics, pharmaceuticals, health products, chocolate or dessert products, dry food, frozen or frozen food, tea, coffee, clothing, toys, paintings and calligraphy, game pieces, photographic products, etc. However, whatever the product used for printing, there is a characteristic of frequent direct contact with humans. If the paper base is not subjected to antibacterial treatment, the paper base is polluted by various bacteria and fungi in the processes of printing processing, circulation, sale, use and the like, and once a contact person touches the paper base, the paper base is easily infected, various diseases are caused, and the health of people is influenced.
The time required for the organic antibacterial material to exert the antibacterial action is shorter, namely the immediate effect is good, but the antibacterial durability is worse; the inorganic antibacterial material has poor immediate effect but better antibacterial durability. With the rapid development of science and technology, various antibacterial materials have appeared, which can be roughly classified into organic antibacterial materials and inorganic antibacterial materials. Today, green and environmental protection are the focus of attention, people are aware that a great amount of organic antibacterial materials are harmful to human bodies and the environment, and when the organic antibacterial materials are used as antibacterial agents, the organic antibacterial materials cannot be guaranteed not to harm human health, and particularly, the organic antibacterial materials are applied to products frequently contacting with human bodies and need careful research, so that the use of the organic antibacterial agents is limited.
The invention patent with the patent number of 200620113237.1 discloses an antibacterial paper with antibacterial layers coated on the upper and lower surfaces of a paper fiber layer, wherein the antibacterial layers are formed by mixing a hydroxyapatite inorganic antibacterial agent containing silver and zinc ions and a surface sizing agent; because of high oxidation activity of zinc ions, the zinc ions are easy to generate chemistry with substances in the airThe antibacterial effect is influenced by the reaction, and the specific gravity of the hydroxyapatite is over high and reaches 3.2g/cm by adopting the hydroxyapatite as a carrier of silver and zinc ions3The specific gravity of the paper is increased, the printing activity of the paper base is influenced, and the subsequent processing and use are troublesome; and the inorganic antibacterial agent is coated on the surface layer of the paper base for a long time, has potential corrosivity on the paper base, has no influence in a short time, and increases the corrosivity after the paper base is damped, so that the paper base is mildewed and rotten.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the mildew-proof antibacterial white cardboard, which uses pure natural plants as antibacterial components, is compounded to obtain a coating layer, and the coating layer is coated on the surfaces of a surface layer and a bottom layer, so that the mildew-proof antibacterial white cardboard has an antibacterial effect, is natural and pollution-free, and has no potential harm to human bodies; the coating layer also improves the moisture resistance of the paper base and effectively avoids the problem of wetting and mildewing.
The purpose of the invention is realized by the following technical scheme:
the mildew-proof antibacterial white cardboard comprises base paper and a coating layer, wherein the coating layer comprises the following raw material components in parts by weight: 50-80 parts of nano calcium carbonate, 1-5 parts of microcrystalline cellulose, 30-50 parts of peach gum, 0.5-3 parts of grapefruit seed extract, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent.
By adopting the technical scheme, the nano calcium carbonate has small specific gravity which is about 2.0g/cm3The proportion of paper cannot be influenced, the calcium carbonate resource is wide in distribution and large in content, the raw materials are sufficiently supplied, and the cost is reduced; the nano calcium carbonate serving as a carrier of the antibacterial component has a slow release function, so that the antibacterial effect is more durable, and the nano calcium carbonate serving as a common filler for papermaking does not have adverse effects on the performance of paper, but has a certain reinforcing effect, so that the formed antibacterial film is beneficial to improving the strength of the paper, and the paper base has better printability. Microcrystalline cellulose (MCC) has special properties of low polymerization degree and large specific surface area, hydrogen bonds exist among molecules of the MCC, and the MCC is associated with the hydrogen bonds under pressure, so the MCC has high compressibility and is used for enhancing the physical strengthThe adhesive properties of the coating layer of the invention; and the microcrystalline cellulose and the nano calcium carbonate are mutually adsorbed to form a super-strong carrier of the antibacterial component, so that the reduction of the antibacterial performance of the antibacterial component can be effectively prevented. In addition, the superstrong combination of nano calcium carbonate and microcrystalline cellulose has a high specific surface area, can effectively play the moisture absorption and damp-proof effects, and effectively avoids the problem that the paper base is affected with damp and mildewed. Peach gum is resin secreted from bark of peach or mountain peach of Rosaceae, also called peach oil, peach fat, peach flower, peach gum and peach gel, and is naturally secreted from peach tree or secreted from wound under external force, and has sufficient water solubility and proper viscosity. The grapefruit seed Extract, GSE, is called grapefruit seed Extract, is extracted from natural plant materials, belongs to plant natural products, and has no harm to human body. GSE has strong antibacterial effect, is applied to fresh-keeping and sterilization of fruits and vegetables, has good effect, and has no report of applying the GSE to an antibacterial layer of a paper layer at present. The coating layer is successfully compounded by the novel antibacterial and mildewproof agent to obtain the coating layer, the high efficiency performance can be shown even under very diluted dosage, the compounding raw materials are simple, and the unexpected antibacterial and mildewproof effect is achieved.
Preferably, the coating layer comprises the following raw material components in parts by weight: 60-70 parts of nano calcium carbonate, 2-4 parts of microcrystalline cellulose, 35-45 parts of peach gum, 1-2 parts of grapefruit seed extract, 0.2-0.4 part of dispersing agent and 1.5-2.5 parts of defoaming agent.
By adopting the technical scheme, the component proportion of the coating layer is further optimized, so that the antibacterial and mildewproof effects are better.
Preferably, the coating layer further comprises 1-5 parts of silica gel powder.
By adopting the technical scheme, the silica gel powder is matched with the super-strong combination of the nano calcium carbonate and the microcrystalline cellulose, so that the moisture absorption and damp-proof performance is further improved, and the problem that the paper base is damped and mildewed is effectively avoided.
Preferably, the base paper comprises a surface layer, a core layer and a bottom layer, wherein the surface layer has the quantitative weight of 25-35g/m2The bottom layer has a quantitative content of 23-33 g/m2。
Preferably, the core layer comprises the following raw material components in parts by weight: 300 parts of bleached chemithermomechanical pulp and 130 parts of bleached willow wood pulp.
By adopting the technical scheme, only the bleached chemithermomechanical pulp is arranged in the core layer of the traditional white cardboard, so that the thickness requirement of the core layer can be met on one hand, and the white cardboard has certain stiffness on the other hand, so that the forming effect of the finished paper is good. To achieve better bulk and stiffness, the amount of bleached chemithermomechanical pulp needs to be increased continuously. However, if the amount of the white cardboard is simply adjusted, although the thickness is increased, the stiffness cannot meet the corresponding requirement, and the continuous increase of the bulk can cause problems of folding bubbles, even delamination and the like of the cardboard, thereby affecting the printing effect of the white cardboard. The willow fiber has the advantages of strong toughness, no upwarp and crack, no moth and the like, the bulk and the stiffness are balanced by adding the bleached willow wood pulp and matching with the bleached chemical thermomechanical pulp, and the toughness, the formability, the compression and deformation resistance and the printing effect of the ivory board are improved.
Preferably, the surface layer comprises the following raw material components in parts by weight: 80-90 parts of bleached hardwood pulp and 10-25 parts of bleached softwood pulp.
Preferably, the bottom layer comprises the following raw material components in parts by weight: 70-80 parts of bleached hardwood pulp and 20-35 parts of bleached softwood pulp.
By adopting the technical scheme, the paper base with high surface smoothness, good stability and durability is obtained.
The invention also provides a processing technology of the mildew-proof antibacterial white cardboard, which comprises the following operation steps:
(1) obtaining surface pulp, core pulp and bottom pulp by pulping and jordaning;
(2) respectively making the surface pulp, the core pulp and the bottom pulp to obtain wet paper sheets with a surface layer, a core layer and a bottom layer, and sequentially squeezing and drying the wet paper sheets to obtain base paper;
(3) uniformly coating the surface layer and the bottom layer of the base paper with the coating layer, and then sequentially performing calendaring, drying, cooling, reeling and rewinding to obtain the mildew-proof antibacterial white cardboard.
By adopting the technical scheme, the coating layer is uniformly coated on the surfaces of the surface layer and the bottom layer, so that the white cardboard has the antibacterial and mildewproof effects.
Preferably, in the step (3), the drying is performed until the moisture content of the base paper is 5.0 to 6.5%, and then the cooling operation is performed.
By adopting the technical scheme, the coating layer is ensured to be gradually and fully compounded with the paper layer into a whole along with the evaporation of water, the water content is controlled to be 5.0-6.5%, and the adhesion strength of the coating layer is ensured to be optimal while the performance of the white cardboard finished product is ensured.
Preferably, the coating layer is coated by surface doctor blade coating, and the coating amount is 10-12g/m2。
By adopting the technical scheme, the paper layer can be fully covered by the coating layer, the durability and the stability of the white cardboard are improved, and the mildew-proof and antibacterial effects of the coating layer can be exerted for a long time.
In conclusion, the invention has the following beneficial effects:
(1) the coating layer is obtained by compounding and is coated on the surface of the surface layer and the bottom layer by using the extract of the grapefruit seed as an antibacterial component, and the coating has high-efficiency antibacterial effect under very diluted dosage, is natural and pollution-free, and has no potential harm to human bodies;
(2) the microcrystalline cellulose and the nano calcium carbonate are mutually adsorbed to form a super-strong carrier of the antibacterial component, so that the reduction of the antibacterial performance of the antibacterial component can be effectively prevented;
(3) the combination body formed by mutual adsorption of the microcrystalline cellulose and the nano calcium carbonate has high specific surface area, effectively plays a role in moisture absorption and moisture prevention, and avoids the problem that the paper base is affected with damp and mildewed.
Detailed Description
The raw material components used in the invention are all commercial products and are not subjected to secondary processing treatment. The parts described in the following examples are parts by weight, and 1 part by weight represents 1 kg.
Example 1
The mildew-proof antibacterial white cardboard is prepared by the following operation steps:
(1) weighing 50 parts of nano calcium carbonate, 1 part of microcrystalline cellulose, 30 parts of peach gum, 0.5 part of grapefruit seed extract, 0.1 part of sodium dodecyl sulfate, 1 part of polyoxyethylene polyoxypropylene ether and 1 part of silica gel powder, and fully stirring in a stirrer until the components are uniformly mixed to obtain a coating material for later use;
(2) weighing 80 parts of bleached hardwood pulp and 10 parts of bleached softwood pulp, and pulping to obtain flour pulp; weighing 70 parts of bleached hardwood pulp and 20 parts of bleached softwood pulp, and pulping to obtain bottom pulp; weighing 250 parts of bleached chemithermomechanical pulp and 100 parts of bleached willow wood pulp, and pulping to obtain core pulp;
(3) respectively manufacturing the surface pulp, the core pulp and the bottom pulp by papermaking: the water filtration vacuum of the high vacuum box of the core net is-0.20 bar, and the surface layer ration is 25g/m2Core layer ration 150 g/m2Bottom layer basis weight 23 g/m2(ii) a Obtaining a wet paper sheet with a surface layer, a core layer and a bottom layer, squeezing the wet paper sheet, wherein the first pressure of squeezing is 140kN/m, the second pressure of squeezing is 700kN/m, and the third pressure of squeezing is 30kN/m, and drying to obtain base paper;
(4) coating SBR type latex on the surface layer and the bottom layer of the base paper, and uniformly coating the coating material by 10g/m in a surface scraper mode2And then, calendaring is carried out under the pressure of 25kN/m, the base paper is dried until the moisture content of the base paper is 5.0%, and then cooling, reeling and rewinding are carried out to obtain the mildew-proof and mildew-proof white cardboard of the embodiment 1.
Example 2
The mildew-proof antibacterial white cardboard is prepared by the following operation steps:
(1) weighing 80 parts of nano calcium carbonate, 5 parts of microcrystalline cellulose, 50 parts of peach gum, 3 parts of grapefruit seed extract, 0.5 part of sodium hexametaphosphate, 3 parts of polyoxypropylene polyoxyethylene glycerol ether and 5 parts of silica gel powder, and fully stirring in a stirrer until the components are uniformly mixed to obtain a coating material for later use;
(2) weighing 90 parts of bleached hardwood pulp and 25 parts of bleached softwood pulp, and pulping to obtain flour pulp; weighing 80 parts of bleached hardwood pulp and 35 parts of bleached softwood pulp, and pulping to obtain bottom pulp; weighing 300 parts of bleached chemithermomechanical pulp and 130 parts of bleached willow wood pulp, and pulping to obtain core pulp;
(3) respectively manufacturing the surface pulp, the core pulp and the bottom pulp by papermaking: the water filtration vacuum of the high vacuum box of the core net is-0.25 bar, and the surface layer ration is 35g/m2Core layer basis weight 240 g/m2Bottom layer basis weight 33g/m2(ii) a Obtaining a wet paper sheet with a surface layer, a core layer and a bottom layer, pressing the wet paper sheet, wherein the first pressing force of the pressing is 143kN/m, the second pressing force of the pressing is 710kN/m, and the third pressing force of the pressing is 33kN/m, and drying to obtain base paper;
(4) coating SBR type latex on the surface layer and the bottom layer of the base paper, and uniformly coating 12g/m of coating material by a surface scraper2And then, calendaring is carried out under the pressure of 25kN/m, the base paper is dried until the moisture content of the base paper is 6.5%, and then cooling, reeling and rewinding are carried out to obtain the mildew-proof and antibacterial white cardboard of the embodiment 2.
Example 3
The mildew-proof antibacterial white cardboard is prepared by the following operation steps:
(1) weighing 60 parts of nano calcium carbonate, 2 parts of microcrystalline cellulose, 35 parts of peach gum, 1 part of grapefruit seed extract, 0.2 part of sodium dodecyl sulfate, 1.5 parts of polyoxypropylene glycerol ether and 3 parts of silica gel powder, and fully stirring in a stirrer until the components are uniformly mixed to obtain a coating material for later use;
(2) weighing 85 parts of bleached hardwood pulp and 15 parts of bleached softwood pulp, and pulping to obtain flour pulp; weighing 75 parts of bleached hardwood pulp and 25 parts of bleached softwood pulp, and pulping to obtain bottom pulp; weighing 280 parts of bleached chemithermomechanical pulp and 110 parts of bleached willow wood pulp, and pulping to obtain core pulp;
(3) respectively manufacturing the surface pulp, the core pulp and the bottom pulp by papermaking: the water filtration vacuum of the high vacuum box of the core net is-0.25 bar, and the surface layer ration is 30g/m2Core layer ration 232 g/m2The basis weight was 28g/m2(ii) a Obtaining a wet paper sheet having a face layer, a core layer and a bottom layer, feeding the wet paper sheet into a pressPerforming press with a first press of 142kN/m, a second press of 710kN/m and a third press of 35kN/m, and drying to obtain base paper;
(4) coating SBR type latex on the surface layer and the bottom layer of the base paper, and uniformly coating the coating material by 11g/m in a surface scraper mode2And then, calendaring is carried out under the pressure of 25kN/m, the base paper is dried until the moisture content of the base paper is 5.5%, and then cooling, reeling and rewinding are carried out to obtain the mildew-proof and mildew-proof white cardboard of the embodiment 3.
Example 4
The mildew-proof antibacterial white cardboard is prepared by the following operation steps:
(1) weighing 70 parts of nano calcium carbonate, 4 parts of microcrystalline cellulose, 45 parts of peach gum, 2 parts of grapefruit seed extract, 0.4 part of sodium polymethacrylate, 2.5 parts of polyoxyethylene polyoxypropylene ether and 4 parts of silica gel powder, and fully stirring in a stirrer until the components are uniformly mixed to obtain a coating material for later use;
(2) weighing 83 parts of bleached hardwood pulp and 20 parts of bleached softwood pulp, and pulping to obtain flour pulp; weighing 78 parts of bleached hardwood pulp and 30 parts of bleached softwood pulp, and pulping to obtain bottom pulp; weighing 290 parts of bleached chemithermomechanical pulp and 120 parts of bleached willow wood pulp, and pulping to obtain core pulp;
(3) respectively manufacturing the surface pulp, the core pulp and the bottom pulp by papermaking: the water filtration vacuum of the high vacuum box of the core net is-0.25 bar, and the surface layer ration is 33g/m2Core layer ration 237 g/m2The bottom layer was fixed at a weight of 30g/m2(ii) a Obtaining a wet paper sheet with a surface layer, a core layer and a bottom layer, pressing the wet paper sheet, wherein the first pressing force of the pressing is 145kN/m, the second pressing force of the pressing is 710kN/m, and the third pressing force of the pressing is 35kN/m, and drying to obtain base paper;
(4) coating SBR type latex on the surface layer and the bottom layer of the base paper, and uniformly coating 12g/m of coating material by a surface scraper2Obtaining an antibacterial and mildewproof coating layer, then calendering the coating layer by pressure of 25kN/m, drying the coating layer until the moisture content of the base paper is 6.0 percent, cooling, reeling and rewinding to obtain the mildewproof and mildewproof coating layer of the embodiment 4Bacterial white cardboard.
Example 5
The mildew-proof antibacterial white cardboard is prepared by the following operation steps:
(1) weighing 65 parts of nano calcium carbonate, 3 parts of microcrystalline cellulose, 40 parts of peach gum, 1 part of grapefruit seed extract, 0.3 part of sodium dodecyl sulfate, 2 parts of polyoxyethylene polyoxypropylene ether and 2 parts of silica gel powder, and fully stirring in a stirrer until the components are uniformly mixed to obtain a coating material for later use;
(2) weighing 88 parts of bleached hardwood pulp and 23 parts of bleached softwood pulp, and pulping to obtain flour pulp; weighing 73 parts of bleached hardwood pulp and 28 parts of bleached softwood pulp, and pulping to obtain bottom pulp; weighing 260 parts of bleached chemithermomechanical pulp and 125 parts of bleached willow wood pulp, and pulping to obtain core pulp;
(3) respectively manufacturing the surface pulp, the core pulp and the bottom pulp by papermaking: the water filtration vacuum of a high vacuum box of the core net is-0.25 bar, and the surface layer ration is 28g/m2Core layer ration of 247 g/m2The basis weight was 25g/m2(ii) a Obtaining a wet paper sheet with a surface layer, a core layer and a bottom layer, squeezing the wet paper sheet, wherein the first pressure of squeezing is 140kN/m, the second pressure of squeezing is 700kN/m, and the third pressure of squeezing is 35kN/m, and drying to obtain base paper;
(4) coating SBR type latex on the surface layer and the bottom layer of the base paper, and uniformly coating 12g/m of coating material by a surface scraper2And then, calendaring is carried out under the pressure of 25kN/m, the base paper is dried until the moisture content of the base paper is 5.5%, and then cooling, reeling and rewinding are carried out to obtain the mildew-proof and mildew-proof white cardboard of the embodiment 5.
Comparative example 1
Comparative example 1 is different from example 5 in that the coating layer raw material composition has no microcrystalline cellulose, and the rest is the same as example 5.
Comparative example 2
Comparative example 2 is different from example 5 in that the coating layer raw material composition does not have nano calcium carbonate, and the rest is the same as example 5.
Comparative example 3
Comparative example 3 is different from example 5 in that grapefruit seed extract is not contained in the coating layer raw material component, and the rest is the same as example 5.
Comparative example 4
Comparative example 4 is different from example 5 in that no peach gum is contained in the coating layer raw material composition, and the rest is the same as example 5.
Comparative example 5
Comparative example 5 is different from example 5 in that silica gel powder is not contained in the coating layer raw material composition, and the rest is the same as example 5.
Comparative example 6
Comparative example 6 differs from example 5 in that the core stock component is the same as example 5 except that no bleached willow wood pulp is present.
Comparative example 7
Comparative example 7 is different from example 5 in that, in step (4), after drying to a base paper moisture content of 6.8%, the temperature reduction operation is performed, and the rest is the same as in example 5.
Comparative example 8
Comparative example 8 is different from example 5 in that, in step (4), after drying to a base paper moisture content of 4.5%, the temperature reduction operation is performed, and the rest is the same as in example 5.
The antibacterial performance tests were carried out for examples 1 to 5 and comparative examples 1 to 8 according to GBT 21866-2008, and the results are shown in Table 1. According to GBT 21866-.
TABLE 1 results of the antibacterial property test of examples 1 to 5 and comparative examples 1 to 8
Figure 419430DEST_PATH_IMAGE002
TABLE 2 results of antibacterial durability test of examples 1 to 5 and comparative examples 1 to 8
Figure 602150DEST_PATH_IMAGE004
As can be seen from tables 1 and 2, the coating layer of the present invention has excellent antibacterial performance and high antibacterial durability, and after a long-term uv irradiation treatment, the antibacterial performance remains substantially unchanged, still has an antibacterial effect of 90% or more, and optimally reaches 95% or more, and exhibits excellent antibacterial durability. And the lack of nano calcium carbonate, microcrystalline cellulose or silica gel powder greatly reduces the antibacterial performance and antibacterial durability, and proves that the silica gel powder is matched with the microcrystalline cellulose and the nano calcium carbonate to be mutually adsorbed to form a super-strong carrier of antibacterial components, thereby greatly contributing to preventing the antibacterial performance of the antibacterial components from being reduced. In addition, the super-strong combination of the nano calcium carbonate and the microcrystalline cellulose has a high specific surface area, can effectively play a role in moisture absorption and moisture prevention, and effectively avoids the problem that the paper base is affected with damp and mildewed. As can be seen from comparative example 4, peach gum has a positive effect on the antibacterial performance and antibacterial durability of the present invention, and the lack of peach gum results in relatively low antibacterial performance and antibacterial durability. From the detection results of comparative example 7 and comparative example 8, it can be seen that the moisture content of drying and shaping in the preparation process, which is beyond the scope of the present invention, affects the antibacterial performance and antibacterial durability, thereby affecting the antibacterial performance of the ivory board.
The physical indexes of the white cardboards of examples 1 to 5 and comparative examples 1 to 8 were measured according to the test method of ISO 534, and the test results are shown in table 3.
TABLE 3 physical indexes of examples 1 to 5 and comparative examples 1 to 8
Figure DEST_PATH_IMAGE006
As can be seen from Table 3, the white cardboard of the invention has high stiffness and high bulk, which can reach 1.79-2.24cm3(ii) in terms of/g. The thickness of the paper product is greatly improved, and under the condition of high bulk, the smoothness of the paper surface and no crease burst are also ensured. And after the bleached willow wood pulp is lacked, the stiffness and the bulk are reduced, the smoothness of the paper surface is greatly reduced, and the printing of the ivory board is influencedAnd (4) brushing effect. From the results of comparative examples 7 and 8, it is understood that the printing effect of the ivory board is seriously affected, leading to paper surface bursting and resource waste if the dry moisture content control of the present invention is not adopted.
Further, the durable ivory boards of examples 1 to 5 and comparative examples 1 to 8 were subjected to a moisture and mildew resistance test using the following test methods: preparing a test piece of 250mm multiplied by 250mm from the durable white cardboard, and measuring the initial water content H1 of each test piece; suspending each test piece in an environmental climate box with the temperature of 50 ℃ and the relative humidity of 90% for 48H, then taking out the test piece, absorbing water vapor on the surface of the test piece by using filter paper, suspending the test piece in an environment with the temperature of 23 ℃ and the RH 50% for 10min, and measuring the final water content H2, wherein the moisture resistance H = H2-H1; the test piece was suspended at 23 ℃ in an atmosphere of RH 50% for 72 hours, and the presence or absence of mold on the surface of the test piece was observed. The results are shown in Table 4.
Table 4 results of moisture and mildew resistance tests of durable ivory boards of examples 1-5 and comparative examples 1-8
Figure DEST_PATH_IMAGE008
As can be seen from Table 4, the ultra-strong combination of the nano calcium carbonate and the microcrystalline cellulose has a high specific surface area, and can effectively play a role in moisture absorption and moisture prevention by matching with silica gel powder, thereby effectively avoiding the problem that the paper base is affected with damp and mildewed. The absence of any of the nano calcium carbonate, microcrystalline cellulose and silica gel powder affected the moisture and mildew resistance of the durable ivory board (comparative examples 1, 2, 5). In addition, comparing example 5 with comparative examples 7 and 8, it can be seen that the moisture control of the drying and dehumidifying stage of the raw paper in the process of making the durable ivory board has a great influence on the moisture and mildew resistance of the durable ivory board finally obtained.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.

Claims (10)

1. The mildew-proof antibacterial white cardboard is characterized by comprising base paper and a coating layer, wherein the coating layer comprises the following raw material components in parts by weight: 50-80 parts of nano calcium carbonate, 1-5 parts of microcrystalline cellulose, 30-50 parts of peach gum, 0.5-3 parts of grapefruit seed extract, 0.1-0.5 part of dispersing agent and 1-3 parts of defoaming agent.
2. The mildew-proof antibacterial ivory board as claimed in claim 1, wherein: the coating layer comprises the following raw material components in parts by weight: 60-70 parts of nano calcium carbonate, 2-4 parts of microcrystalline cellulose, 35-45 parts of peach gum, 1-2 parts of grapefruit seed extract, 0.2-0.4 part of dispersing agent and 1.5-2.5 parts of defoaming agent.
3. The mildew-proof antibacterial ivory board as claimed in claim 1, wherein: the coating layer also comprises 1-5 parts of silica gel powder.
4. The mildew-proof antibacterial ivory board as claimed in claim 1, wherein: the base paper comprises a surface layer, a core layer and a bottom layer, wherein the surface layer has the quantitative weight of 25-35g/m2The bottom layer has a quantitative content of 23-33 g/m2。
5. The mildew-proof antibacterial ivory board as claimed in claim 4, wherein the core layer comprises the following raw material components in parts by weight: 300 parts of bleached chemithermomechanical pulp and 130 parts of bleached willow wood pulp.
6. The mildew-proof antibacterial white cardboard according to claim 4, wherein the surface layer comprises the following raw material components in parts by weight: 80-90 parts of bleached hardwood pulp and 10-25 parts of bleached softwood pulp.
7. The mildew-proof antibacterial white cardboard according to claim 4, wherein the bottom layer comprises the following raw material components in parts by weight: 70-80 parts of bleached hardwood pulp and 20-35 parts of bleached softwood pulp.
8. A processing technology of the mildew-proof antibacterial ivory board according to any one of claims 4-7 is characterized by comprising the following operation steps:
(1) obtaining surface pulp, core pulp and bottom pulp by pulping and jordaning;
(2) respectively making the surface pulp, the core pulp and the bottom pulp to obtain wet paper sheets with a surface layer, a core layer and a bottom layer, and sequentially squeezing and drying the wet paper sheets to obtain base paper;
(3) uniformly coating the surface layer and the bottom layer of the base paper with the coating layer, and then sequentially performing calendaring, drying, cooling, reeling and rewinding to obtain the mildew-proof antibacterial white cardboard.
9. The processing technology of the mildew-proof antibacterial white cardboard according to claim 8, characterized in that: in the step (3), after drying until the moisture content of the base paper is 5.0-6.5%, cooling operation is carried out.
10. The processing technology of the mildew-proof antibacterial white cardboard according to claim 8, characterized in that: the coating layer is coated by a surface scraper, and the coating weight is 10-12g/m2。
CN201811056572.6A 2018-09-11 2018-09-11 Mildew-proof antibacterial white cardboard and processing technology thereof Pending CN110886132A (en)

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CN102518002A (en) * 2011-12-30 2012-06-27 珠海华丰纸业有限公司 High-bulk coating white cardboard and production process thereof
CN105735043A (en) * 2016-03-30 2016-07-06 宁波艾克威特智能科技有限公司 Coating composite for improving high-speed printing performance of coated paper
CN105735044A (en) * 2016-04-11 2016-07-06 杭州电子科技大学 Anti-fake coating white cardboard with antibacterial effect

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CN1734016A (en) * 2004-08-11 2006-02-15 山东太阳纸业股份有限公司 Black paperboard and production method thereof
CN101328701A (en) * 2007-05-29 2008-12-24 珠海经济特区红塔仁恒纸业有限公司 Long-acting antibiotic white cardboard and production method thereof
CN102518002A (en) * 2011-12-30 2012-06-27 珠海华丰纸业有限公司 High-bulk coating white cardboard and production process thereof
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Application publication date: 20200317