CN110541325A - papermaking coating, preparation method thereof and paperboard - Google Patents
papermaking coating, preparation method thereof and paperboard Download PDFInfo
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- CN110541325A CN110541325A CN201810523761.3A CN201810523761A CN110541325A CN 110541325 A CN110541325 A CN 110541325A CN 201810523761 A CN201810523761 A CN 201810523761A CN 110541325 A CN110541325 A CN 110541325A
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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
- 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
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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
- 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
- D21H19/64—Inorganic 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
- 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
-
- 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
- D21H21/18—Reinforcing 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
- 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)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
the invention discloses a papermaking coating, a preparation method thereof and a paperboard, wherein the papermaking coating comprises a pigment, latex, graphene, a pH value regulator, a thickening agent, a dispersing agent, a lubricant and a waterproof agent, wherein the graphene accounts for 0.1-1.6 parts by mass. According to the invention, the graphene is added into the pigment and latex of the raw materials of the coating, and the related auxiliary agents are added, so that the oxygen-insulating coating is prepared, the problems of poor oxygen-insulating performance, complex processing procedure and environmental pollution of the existing coating are solved, the oxygen-insulating property of the coating is improved, and the processing procedure is simple and environment-friendly.
Description
Technical Field
The invention relates to the field of papermaking, in particular to a papermaking coating, a preparation method thereof and a paperboard.
background
the paper package features excellent buffering performance, convenient processing, storage and transportation, good printing and decorating adaptability, high safety, low cost and easy recovery of waste, but has poor barrier performance, especially poor oxygen barrier effect. The barrier requirement for oxygen in food packaging is high and oxygen directly causes oxidation of the fat in the food, which can occur even at low temperatures, at a rate proportional to the partial pressure of oxygen and the contact area. The oxidation of oil and fat produces peroxide, which makes the food lose its edible value and produce foreign odor and poison.
The paper itself is a porous structure composed of fibers containing long-chain cellulose molecules interwoven through a network. Because cellulose has hydrophilicity and the porosity of a fiber network, the air permeability of general paper is very high, and the barrier performance of the paper to water vapor, oxygen and the like is limited. At present, most of barrier packaging materials in the market are improved in barrier performance by a method of coating films on the surfaces of paper boards through post-processing, and the method is complex in operation and high in cost and increases the difficulty in recycling the paper boards. At present, the common oxygen insulation method for food packaging is a vacuum packaging technology and an air inflation packaging technology. The liquid packaging paper board such as tetra pak also achieves the barrier property by post-processing the paper board, such as film coating or aluminum foil coating. PE and aluminum foil are materials which are difficult to recycle and degrade, are not environment-friendly, and are complex to process and operate. If the paperboard is processed by only using the coating, the aim of high-efficiency oxygen isolation cannot be achieved by the current technology although the environmental protection problem is not outstanding. Therefore, an oxygen-insulating coating which has strong oxygen-insulating property, simple processing procedure and environmental protection is lacked at present.
Graphene is used as a two-dimensional sheet nano material, helium with the minimum molecular weight cannot pass through the graphene due to the special chemical structure of the graphene, and the graphene becomes an ideal nano filling barrier material due to the compact in-plane structure and the huge width/thickness ratio of the graphene. The graphene is doped in a high molecular material to improve the mechanical property and the heat resistance of the material and improve the comprehensive performance of a polymer matrix and the like. Pinto et al investigated the barrier properties of polylactic acid PLA/Graphene (GNP) composites against oxygen and nitrogen. The use of 0.4% by weight of the additive in the composite compared to that before the addition of graphene can reduce the permeability of the composite to oxygen by three times and the permeability to nitrogen by four times. Kim et al reported comparative studies on the gas permeability of various graphite-reinforced polyurethane composites with gas barrier properties synthesized by different preparation methods. They found that the in-situ polymerization for preparing the Thermal Reduction Graphite (TRG)/Polyurethane (PU) composite material has a better gas permeability than the composite material prepared by the solution blending method. In addition, when the content of the graphene modified by the isocyanate group in the polymer matrix reaches 1.6% (volume content), 90% of barrier amount to nitrogen is achieved. The method comprises the steps of dispersing Graphene Oxide (GO) in a polyvinyl alcohol (PVA) aqueous solution by Ronggang and the like, and preparing a PVA/graphene composite film material by adopting a solution casting method, wherein the film material has ultrahigh barrier property to air. The compact GO in-plane structure enables a gas permeation path to be changed from a direction vertical to the surface of the film to a parallel direction, so that the gas permeation area is greatly reduced, and the barrier property of the composite material is improved. The researches show that the graphene can improve the barrier property of the high polymer film material. Compared with a multilayer and porous paperboard material, the high polymer material layer has a higher gas barrier effect. How to apply graphene to a papermaking water-based coating to give full play to the gas barrier property of the graphene, and systematic research needs to be carried out by combining the characteristics of the graphene, the papermaking coating and the papermaking process.
Disclosure of Invention
the invention mainly provides a papermaking coating, a preparation method thereof and a paperboard, and aims to solve the problems of poor oxygen insulation performance, complex processing procedure and environmental pollution of the existing coating.
In order to solve the technical problems, the invention adopts the technical scheme that: the papermaking coating comprises a pigment, latex, graphene, a pH value regulator, a thickening agent, a dispersing agent, a lubricant and a waterproof agent, wherein the graphene accounts for 0.1-1.6 parts by mass.
In order to solve the technical problem, the invention adopts another technical scheme that: provided is a preparation method of a papermaking coating, comprising the following steps:
providing a graphene solution;
adding the graphene solution into a dispersion liquid containing a dispersing agent and a pH value regulator to form a graphene pigment suspension; and
And adding latex, a thickening agent, a lubricant and a waterproof agent into the graphene pigment suspension to obtain the papermaking coating.
in order to solve the above technical problems, the present invention adopts another technical solution: the paperboard comprises a substrate and a first coating layer coated on the surface of the substrate, wherein the coating of the first coating layer is the papermaking coating.
The invention has the beneficial effects that: the graphene is added into the pigment and latex of the raw materials of the coating, and the related auxiliary agents are added, so that the oxygen-insulating coating is prepared, the problems of poor oxygen-insulating performance, complex processing procedure and environmental pollution of the existing coating are solved, the oxygen-insulating property of the coating is improved, and the processing procedure is simple and environment-friendly.
Drawings
FIG. 1 is a schematic flow chart of the preparation of a papermaking coating according to the present invention;
Fig. 2 is a schematic view of the structure of the paperboard of the present invention.
Detailed Description
The papermaking coating comprises, by mass, 0.1-1.6 parts of graphene, 0.05-0.2 part of sodium hydroxide, 0-0.5 part of thickening agent, 0.2-0.5 part of dispersing agent, 0.2-0.5 part of lubricating agent and 0.5-2.0 parts of waterproof agent. Also comprises 50-100 parts by mass of pigment, 30-50 parts by mass of latex or 40-60 parts by mass of pigment and 50-100 parts by mass of latex. Wherein, the graphene is sheet-shaped, the size is 1-15 microns, the average thickness is 2.4 nanometers, the latex is one or more of butylbenzene latex, styrene-acrylic latex and polyvinyl acetate latex, the particle size of the latex is 120-160nm, and the glass transition temperature of the latex is 5-15 ℃; the pH value regulator is sodium hydroxide, the thickening agent is polyacrylic acid, the dispersing agent is polyacrylate, the lubricant is calcium stearate, the water resisting agent is polyamide resin, and the pigment is sheet soil with 70-95-grade high diameter-thickness ratio, wherein the sheet soil particles with the particle diameter less than 2um account for 75-90%.
Referring to FIG. 1, a schematic flow chart of the preparation of the papermaking coating of the present invention is shown. As shown in figure 1 of the drawings, in which,
The preparation method of the papermaking coating comprises the following steps:
Step S1, adding graphene into a solvent, and dispersing for 20-40min at the rotating speed of 300-500rpm/min to prepare a uniformly dispersed graphene solution;
Step S2, adding the graphene solution into a dispersion solution containing a dispersant and a pH value regulator, adding paper making pigment powder into the solution, and dispersing and stirring for 1-1.5 hours to form a graphene pigment suspension;
and step S3, adding latex, a thickening agent, a lubricant and a waterproof agent into the graphene pigment suspension, dispersing and stirring for 20-40min, and adjusting the solid content to 53-62% to obtain the papermaking coating.
Refer to fig. 2, which is a schematic structural diagram of the paperboard of the present invention. The paperboard comprises a substrate and a first coating layer 4 coated on the surface of the substrate, wherein the coating of the first coating layer 4 is the papermaking coating. The base material comprises a second coating layer 1, a surface sizing layer 2 and base paper 3, wherein the surface sizing layer 2 is coated on the first surface of the base paper 3, the second coating layer 1 is coated on the surface sizing layer 2, and the first coating layer 4 is coated on the second surface, opposite to the first surface, of the base paper 3. The paperboard further comprises a third coating layer 5, which third coating layer 5 is arranged between the second surface of the base paper 3 and the first coating layer 4. The coating of the third coating layer 5 comprises one or more of polyvinyl alcohol, starch solution and graphene, the coating weight of the third coating layer 5 is 3-6gsm, and the coating weight of the first coating layer 4 is 12-17 gsm. The first coating layer 4 and the second coating layer 1 may be the same coating material or different coating materials. In other embodiments, the substrate may be a base paper, that is, the first coating layer 4 is directly coated on one surface of the base paper or the first coating layer 4 is directly coated on two opposite surfaces of the base paper, or a remaining material layer is disposed between the base paper 3 and the first coating layer 4 or a remaining material layer is disposed on the first coating layer 4, as long as the object of the present invention, that is, the oxygen barrier property of the coating material can be improved by the first coating layer 4 according to the present invention.
Example 1
coating for preparing the first coating layer 4:
providing 0.8g of graphene solution with an absolute dry weight, and dispersing for 30min at the rotating speed of 400rpm/min to uniformly disperse the graphene again;
Adding the dispersed graphene solution into a dispersion liquid containing 0.3g of polyacrylate dispersant and 0.1g of sodium hydroxide for dispersion, and adding 50g of flaky soil to form a graphene pigment suspension;
100g of styrene-butadiene latex, 0.05g of polyacrylic acid as a thickening agent, 0.3g of calcium stearate as a lubricant and 0.5g of polyamide resin as a waterproof agent are added into the graphene pigment suspension, dispersed and stirred for 30min, and the solid content is adjusted to 53-62%, so that the coating of the first coating layer 4 is obtained.
Preparing a paperboard:
After coating the second coating layer 1 and the surface sizing layer 2 on one surface of the base paper 3, the first coating layer 4 is coated on the other surface of the base paper 3, and the coating weight is 9 gsm. After the board preparation was complete, the oxygen permeability was tested to be 693.24ml/m2. d.
example 2
Coating for preparing the first coating layer 4:
providing 0.8g of graphene solution with an absolute dry weight, and dispersing for 30min at the rotating speed of 400rpm/min to uniformly disperse the graphene again;
Adding the dispersed graphene solution into a dispersion liquid containing 0.3g of polyacrylate dispersant and 0.1g of sodium hydroxide for dispersion, and adding 100g of flaky soil to form a graphene pigment suspension;
adding 40g of styrene-butadiene latex, 0.05g of polyacrylic acid as a thickening agent, 0.3g of calcium stearate as a lubricant and 0.5g of polyamide resin as a waterproof agent into the graphene pigment suspension, dispersing and stirring for 30min, and adjusting the solid content to 53-62% to obtain the coating of the first coating layer 4.
Preparing a paperboard:
After coating the second coating layer 1 and the surface sizing layer 2 on one surface of the base paper 3, the first coating layer 4 is coated on the other surface of the base paper 3, and the coating weight is 9 gsm. After the board preparation was complete, the oxygen permeability was tested to be 1607.2ml/m2. d.
Example 3
Coating for preparing the first coating layer 4:
Providing 0.8g of graphene solution with an absolute dry weight, and dispersing for 30min at the rotating speed of 400rpm/min to uniformly disperse the graphene again;
Adding the dispersed graphene solution into a dispersion liquid containing 0.3g of polyacrylate dispersant and 0.1g of sodium hydroxide for dispersion, and adding 100g of flaky soil to form a graphene pigment suspension;
Adding 40g of styrene-butadiene latex, 0.05g of polyacrylic acid as a thickening agent, 0.3g of calcium stearate as a lubricant and 1.5g of polyamide resin as a waterproof agent into the graphene pigment suspension, dispersing and stirring for 30min, and adjusting the solid content to 53-62% to obtain the coating of the first coating layer 4.
Coating for preparing the third coating layer 5:
A polyvinyl alcohol solution was prepared by supplying 100g of polyvinyl alcohol in an oven dry amount to obtain a coating material for the third coating layer 5.
Preparing a paperboard:
After a second coating layer 1 and a surface sizing layer 2 are coated on one surface of base paper 3, a third coating layer 5 is coated on the other surface of the base paper 3, the coating weight is 6gsm, then a first coating layer 4 is coated, the coating weight is 9gsm, and after the preparation of the paperboard is finished, the tested oxygen permeability is 1442.8 ml/m2. d.
example 4
coating for preparing the first coating layer 4:
Providing 0.8g of graphene with an absolute dry weight, preparing a graphene solution, and dispersing for 30min at a rotating speed of 400rpm/min to uniformly disperse the graphene again;
adding the dispersed graphene solution into a dispersion liquid containing 0.3g of polyacrylate dispersant and 0.1g of sodium hydroxide for dispersion, adding 100g of flaky soil, and stirring for 1 hour to form a graphene pigment suspension;
adding 40g of styrene-butadiene latex, 0.05g of polyacrylic acid as a thickening agent, 0.3g of calcium stearate as a lubricant and 1.5g of polyamide resin as a waterproof agent into the graphene pigment suspension, dispersing and stirring for 30min, and adjusting the solid content to 53-62% to obtain the coating of the first coating layer 4.
coating for preparing the third coating layer 5:
the oven dry amount of the coating starch was provided as 100g, and the coating material of the third coating layer 5 was obtained.
after a second coating layer 1 and a surface sizing layer 2 are coated on one surface of base paper 3, a third coating layer 5 is coated on the other surface of the base paper 3, the coating weight is 9gsm, then a first coating layer 4 is coated, the coating weight is 6gsm, and after the preparation of the paperboard is finished, the oxygen permeability is tested to be 79.74ml/m2. d.
example 5
Coating for preparing the first coating layer 4:
Providing 0.8g of graphene with an absolute dry weight, preparing a graphene solution, and dispersing for 30min at a rotating speed of 400rpm/min to uniformly disperse the graphene again;
Adding the dispersed graphene solution into a dispersion liquid containing 0.3g of polyacrylate dispersant and 0.1g of sodium hydroxide for dispersion, adding 100g of flaky soil, and stirring for 1 hour to form a graphene pigment suspension;
adding 40g of styrene-butadiene latex, 0.05g of polyacrylic acid as a thickening agent, 0.3g of calcium stearate as a lubricant and 1.5g of polyamide resin as a waterproof agent into the graphene pigment suspension, dispersing and stirring for 30min, and adjusting the solid content to 53-62% to obtain the coating of the first coating layer 4.
Coating for preparing the third coating layer 5:
An oven dry amount of 100g of coating starch and 1g of graphene was provided, resulting in a coating of the third coating layer 5.
after a second coating layer 1 and a surface sizing layer 2 are coated on one surface of base paper 3, a third coating layer 5 is coated on the other surface of the base paper 3, the coating weight is 6gsm, then a first coating layer 4 is coated, the coating weight is 9gsm, and after the preparation of the paperboard is finished, the oxygen permeability is tested to be 50.82ml/m2. d.
comparative example 1
coating for preparing the first coating layer 4:
A coating material for the first coating layer 4 was prepared by dispersing and stirring 100g of a clay sheet, 40g of styrene-butadiene latex, 0.3g of a polyacrylate dispersant, 0.1g of sodium hydroxide, 0.05g of a polyacrylic acid as a thickener, 0.3g of calcium stearate as a lubricant, and a polyamide resin as a water resistant agent for 30 minutes to adjust the solid content to 53 to 62%.
After a second coating layer 1 and a surface sizing layer 2 are coated on one surface of the base paper 3, a first coating layer 4 is coated on the other surface of the base paper 3, the coating weight is 9gsm, and the oxygen permeability is tested to be 5851.52ml/m2.d after the preparation of the paperboard is finished.
Comparative example 2
Coating for preparing the first coating layer 4:
a coating material for the first coating layer 4 was prepared by dispersing and stirring 50g of a clay sheet, 100g of styrene-butadiene latex, 0.3g of a polyacrylate dispersant, 0.1g of sodium hydroxide, 0.05g of a polyacrylic acid as a thickener, 0.3g of calcium stearate as a lubricant, and 1.5g of a polyamide resin as a water resistant agent for 30 minutes to adjust the solid content to 53 to 62%.
After a second coating layer 1 and a surface sizing layer 2 are coated on one surface of the base paper 3, a first coating layer 4 is coated on the other surface of the base paper 3, the coating weight is 9gsm, and the oxygen permeability is tested to be 1171.36ml/m2.d after the preparation of the paperboard is finished.
TABLE 1 oxygen permeability data for paperboard of different coating weights
as can be seen from Table 1, latex has a great influence on oxygen permeability, and when latex is used as a film-forming substance in a large amount, it can fill the gaps of the clay flakes better. When only the first coating layer is coated but the third coating layer is not coated, the better oxygen blocking effect can be achieved by adjusting the amount of latex and pigment, and the coating is low in cost and simple in process. After the base paper is coated with the second coating layer and the surface sizing layer, the other surface of the base paper is coated with the first coating layer and/or the third coating layer, and the oxygen permeability can be lower. As can be seen from the table, in example 5, the first coating layer and the third coating layer applied simultaneously had the least oxygen permeability and the best oxygen barrier effect.
The invention has the beneficial effects that: the graphene is added into the pigment and latex of the raw materials of the coating, and the related auxiliary agents are added, so that the oxygen-insulating coating is prepared, the problems of poor oxygen-insulating performance, complex processing procedure and environmental pollution of the existing coating are solved, the oxygen-insulating property of the coating is improved, and the processing procedure is simple and environment-friendly. Through the scraper coating mode, the flaky pigments can be horizontally and uniformly arranged, the compactness of the coating is improved, and the barrier effect of the coating on gas is favorably improved.
the above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The papermaking coating is characterized by comprising a pigment, latex, graphene, a pH value regulator, a thickening agent, a dispersing agent, a lubricant and a water-resistant agent, wherein the graphene is flaky, the size of the graphene is 1-15 micrometers, and the thickness of the graphene is 2.4 nanometers; the graphene accounts for 0.1-1.6 parts by mass.
2. The papermaking coating according to claim 1, wherein the pH adjuster is sodium hydroxide, the sodium hydroxide is 0.05 to 0.2 parts by mass, the thickener is 0 to 0.5 parts by mass, the dispersant is 0.2 to 0.5 parts by mass, the lubricant is 0.2 to 0.5 parts by mass, and the water resistant additive is 0.5 to 2.0 parts by mass.
3. The papermaking coating according to claim 2, wherein the pigment is 50 to 100 parts by mass and the latex is 30 to 50 parts by mass.
4. The papermaking coating according to claim 2, wherein the pigment is 40 to 60 parts by mass and the latex is 50 to 100 parts by mass.
5. The papermaking coating according to claim 1, wherein the latex is one or more of styrene-butadiene latex, styrene-acrylic latex and polyvinyl acetate latex, the particle size of the latex is 120-160nm, and the glass transition temperature of the latex is 5-15 ℃; the thickening agent is polyacrylic acid, the dispersing agent is polyacrylate, the lubricating agent is calcium stearate, the waterproof agent is polyamide resin, the pigment is flaky soil, and flaky soil particles with the particle size smaller than 2um account for 75-90%.
6. a preparation method of a papermaking coating is characterized by comprising the following steps:
Providing a graphene solution;
adding the graphene solution into a dispersion liquid containing a dispersing agent and a pH value regulator to form a graphene pigment suspension; and
And adding latex, a thickening agent, a lubricant and a waterproof agent into the graphene pigment suspension to obtain the papermaking coating.
7. the method of preparing a papermaking coating according to claim 6, wherein the providing a graphene solution comprises:
adding graphene into a solvent, and dispersing for 20-40min at the rotating speed of 300-500 rpm/min;
the step of adding the graphene solution into a dispersion liquid containing a dispersing agent and a pH value regulator to form a graphene pigment suspension comprises the following steps:
Adding the graphene solution into a dispersion liquid containing a dispersing agent and a pH value regulator, adding papermaking pigment powder into the solution, and dispersing and stirring for 1-1.5 hours to form a graphene pigment suspension;
The method for preparing the papermaking coating by adding the latex, the thickening agent, the lubricant and the waterproof agent into the graphene pigment suspension comprises the following steps:
the dispersion stirring time of the graphene pigment suspension is 20-40 min;
Wherein the solid content of the papermaking coating is 53-62%.
8. a paperboard comprising a substrate and a first coating layer applied to a surface of the substrate, wherein the coating material of the first coating layer is the papermaking coating material according to any one of claims 1 to 5.
9. the paperboard of claim 8 wherein said substrate comprises a base paper, a surface size layer coated on a first surface of said base paper, a second coating layer coated on said surface size layer, and a third coating layer coated on a second surface of said base paper opposite said first surface, wherein said first coating layer is coated on a side of said third coating layer remote from said base paper.
10. the paperboard of claim 8 wherein said second coating layer is coated with the same papermaking coating as said first coating layer or said second coating layer is coated with a different papermaking coating than said first coating layer, said third coating layer having a coating comprising one or more of polyvinyl alcohol, starch solution, and graphene, said third coating layer having a coating weight of from 3 to 6gsm and said first coating layer having a coating weight of from 12 to 17 gsm.
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| CN108755268A (en) * | 2018-05-29 | 2018-11-06 | 宁波亚洲浆纸业有限公司 | A kind of moisture-proof coating of paper grade (stock), asphalt board and preparation method thereof |
| CN116411478A (en) * | 2022-12-30 | 2023-07-11 | 浙江大胜达包装股份有限公司 | Production method of graphene-coated corrugated paper |
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Application publication date: 20191206 |