CN112160186A - Coating and preparation method thereof, coated paper and preparation method thereof - Google Patents
Coating and preparation method thereof, coated paper and preparation method thereof Download PDFInfo
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- CN112160186A CN112160186A CN202010832442.8A CN202010832442A CN112160186A CN 112160186 A CN112160186 A CN 112160186A CN 202010832442 A CN202010832442 A CN 202010832442A CN 112160186 A CN112160186 A CN 112160186A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/31—Gums
-
- 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
-
- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
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- 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
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- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
The application discloses a coating and a preparation method thereof, and coated paper and a preparation method thereof, wherein the coating comprises the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier. This application can be modified to the coating through adding water repellent and tackifier in the coating, makes the coating have good water resistance, and the coating that will modify back is as the coating of fibre base paper, through the synergistic effect of water repellent and tackifier, can effectively improve the warpage of coated paper, warp scheduling problem.
Description
Technical Field
The application relates to the field of printing substrates, in particular to a coating and a preparation method thereof, and coated paper and a preparation method thereof.
Background
The coated paper is a high-grade printing base material, and the surface of the paper has very high smoothness and glossiness by coating the coating on fiber-based paper, drying the coating and performing supercalendering treatment by a calender. However, compared with the non-coated paper with the same gram weight, the coated paper has low thickness, less fiber base raw materials for supporting, and the paper is easy to warp and deform, which leads to a series of problems such as unsmooth printing, warping after printing, poor processing and the like.
The existing method for improving the warping deformation of the coated paper, for example, adjusts the humidity of the paper roll and the humidity of the environment to make the two perfectly matched, so that the paper is in a water balance state at all angles. However, the humidity of the paper roll is relatively easy to adjust, but the space of a workshop of a paper mill is very large, and the environmental humidity is difficult to control stably; and the coated paper produced by the paper mill needs to be sent to a downstream customer for further use, and the paper mill cannot know whether the coated paper has serious warping deformation at the customer because the paper mill cannot know the ambient humidity of the place where the customer is located.
Disclosure of Invention
The technical problem mainly solved by the application is to provide the coating and the preparation method thereof, the coated paper and the preparation method thereof, and the influence of the environmental humidity on the coated paper is reduced by adding the water repellent agent and the tackifier into the coating of the coated paper.
In order to solve the technical problems, the application adopts a technical scheme that the coating comprises the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier.
Wherein the water repellent agent comprises an organic water repellent agent and an inorganic water repellent agent.
Wherein the organic water repellent comprises a chemically cross-linked copolymer.
Wherein the inorganic water repellent agent comprises zirconium carbonate salt.
Wherein the adhesion promoter comprises an aqueous silane coupling agent, and/or a polyamide resin, and/or an isocyanate.
In order to solve the above technical problem, another technical solution adopted by the present application is to provide a method for preparing a coating, which comprises the following steps: preparing the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier; mixing calcium carbonate and starch according to the raw material ratio, uniformly stirring, adding latex according to the raw material ratio, and uniformly stirring again to obtain a first intermediate coating; adding a water repellent agent in the first intermediate coating according to the raw material ratio and uniformly stirring to obtain a second intermediate coating; and adding the tackifier in the ratio of the raw materials into the second intermediate coating, and uniformly stirring to obtain the coating.
Wherein the temperature during stirring is controlled to be 40-50 ℃.
In order to solve the technical problem, another technical scheme adopted by the application is to provide a coated paper, wherein a coating used for a coating of the coated paper comprises the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier.
In order to solve the above technical problem, another technical solution adopted by the present application is to provide a method for preparing coated paper, including: preparing the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier; mixing calcium carbonate and starch according to the raw material ratio, uniformly stirring, adding latex according to the raw material ratio, and uniformly stirring again to obtain a first intermediate coating; adding a water repellent agent in the first intermediate coating according to the raw material ratio and uniformly stirring to obtain a second intermediate coating; adding a tackifier in a ratio of the raw materials into the second intermediate coating, and uniformly stirring to obtain a coating; fiber-based paper is prepared, and the fiber-based paper is coated with a coating material to obtain coated paper.
Wherein, coating the fiber-based paper with the coating, and the step of obtaining the coated paper comprises: coating one side of the fiber base paper by using the coating to obtain single-side coated paper; or coating the two sides of the fiber base paper by using the coating to obtain the double-sided coated paper.
The beneficial effect of this application is: different from the prior art, the application provides a coating and a preparation method thereof, and coated paper and a preparation method thereof, and the coating can be modified by adding a water repellent agent and a tackifier into the coating, so that the coating has good water resistance, and the modified coating is used as a coating of fiber-based paper, so that the influence of water molecules on fibers in the coating can be reduced, and then the influence of environment humidity on the coated paper is reduced. Through the mode, the problems of warping, deformation and the like of the coated paper can be effectively solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow diagram of one embodiment of a method of preparing a coating according to the present application;
FIG. 2 is a schematic flow diagram of one embodiment of a method of making a coated paper according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, the "plural" includes at least two in general, but does not exclude the presence of at least one.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that the terms "comprises," "comprising," or any other variation thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The coating technique in papermaking is to formulate a coating with a coating pigment much smaller than the fibers of the base paper and apply it to the surface of the base paper to improve the smoothness of the paper by reducing the porosity of the paper to obtain a coated paper with excellent printing properties. The surface of the coated paper has very high smoothness and glossiness, but compared with non-coated paper with the same gram weight, the coated paper has low thickness and less fiber-based raw materials for supporting, and the paper is easy to warp and deform, so that a series of problems such as unsmooth printing, warping after printing, poor processing and the like are caused.
The existing method for improving the warping deformation of the coated paper, for example, adjusts the humidity of the paper roll and the humidity of the environment to make the two perfectly matched, so that the paper is in a water balance state at all angles. However, the humidity of the paper roll is relatively easy to adjust, but the space of a workshop of a paper mill is very large, and the environmental humidity is difficult to control stably; and the produced coated paper needs to be sent to a downstream customer for further use, and a paper mill cannot know the environmental humidity of the place where the customer is located, so that whether the coated paper has serious warping deformation at the customer cannot be known.
Based on the situation, the application provides the coating and the preparation method thereof, and the coated paper and the preparation method thereof, wherein the influence of the environmental humidity on the coated paper is reduced by adding the water repellent agent and the tackifier into the coating of the coated paper.
The coating provided by the application comprises the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier.
In the present embodiment, calcium carbonate refers to various calcium carbonates that can be used as a coating pigment, for example, Precipitated Calcium Carbonate (PCC), Ground Calcium Carbonate (GCC), and modified PCC and/or GCC, and the like.
In the present embodiment, the latex is a binder for coating pigments, which contains carboxyl groups but has low hydrophilicity, has water swelling property but is water-insoluble, and includes, for example, acrylic polymer latex, polyvinyl acetate latex, styrene acrylic copolymer latex, polyurethane latex, etc., which are not limited in the present application.
In this embodiment, starch refers to a water-soluble polymeric binding agent for coating pigments, including starch or starch derivatives. Wherein the starch comprises a linear, branched or grafted polymer or copolymer containing sufficient hydrophilic segments to render the polymer water soluble, capable of providing hydroxyl groups, increasing the hydrophilicity of the coating.
In the embodiment, the coating comprises the water-resistant agent, and the water-resistant agent can reduce the water solubility of the coating pigment and the bonding agent after drying and film forming, so that the water resistance of the coating is improved.
In the embodiment, the coating comprises the tackifier, and the tackifier can enhance the bonding strength among different materials in the coating and further improve the water resistance of the coating.
Different from the prior art, the coating provided by the application comprises the water-resistant agent and the tackifier, wherein the water-resistant agent can enable the coating to have certain water-resistant performance, and the synergistic effect of the tackifier can further improve the water-resistant performance of the coating.
Correspondingly, the application provides a coating preparation method.
Specifically, referring to fig. 1, fig. 1 is a schematic flow chart of an embodiment of a method for preparing a coating according to the present application, wherein the method comprises:
s11: preparing the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier.
S12: and mixing the calcium carbonate and the starch according to the raw material ratio, uniformly stirring, adding the latex according to the raw material ratio, and uniformly stirring again to obtain the first intermediate coating.
In a preferred embodiment, starch is used in an amount of 0 part in order to improve the water resistance of the coating.
S13: and adding a water repellent agent in the first intermediate coating according to the raw material ratio, and uniformly stirring to obtain a second intermediate coating.
In this embodiment, the water-repellent agent includes an organic water-repellent agent and an inorganic water-repellent agent.
Wherein the organic water repellent comprises a chemically cross-linked copolymer.
Specifically, the chemically crosslinked copolymer includes glyoxal, melamine glyoxal resin, melamine formaldehyde resin, polyamide polyamine epichlorohydrin, polyamide polyurea resin, and the like.
In a preferred embodiment, the added organic water repellent agent includes at least two of the above compounds, which is not limited herein.
In another embodiment, the organic water repellent agent to be added is any of the above-mentioned compounds, and the present application does not limit the present invention.
In this embodiment, the water solubility of the coating pigment and the adhesive after drying and film forming can be reduced by adding the organic water repellent to the first intermediate coating.
Wherein the inorganic water repellent agent comprises zirconium carbonate salt.
In this embodiment, the wet abrasion resistance and the gloss of the adhesive film can be improved by adding zirconium carbonate to the first intermediate coating material.
In a preferred embodiment, the water repellent agent added includes at least one of a zirconium carbonate salt and a chemically cross-linked copolymer, which is not limited in this application.
S14: and adding the tackifier in the ratio of the raw materials into the second intermediate coating, and uniformly stirring to obtain the coating.
In the present embodiment, the tackifier includes an aqueous silane coupling agent, and/or a polyamide resin, and/or an isocyanate.
The function of the tackifier is based on the fact that it has two groups: a group can be bonded to the bonded backbone material; and the other group can be combined with a high polymer material or an adhesive, and a chemical bond with higher strength is formed on the bonding interface, so that the bonding strength among different materials in the coating is enhanced, and the water resistance of the coating is further improved.
For example, the aqueous silane coupling agent has the formula Y-R-Si (OR)3Wherein Y is an organofunctional group and SiOR is a siloxy group. Wherein, the silane oxygen group has reactivity to inorganic substances, and the organic functional group has reactivity or compatibility to organic substances, so that when the water-based silane coupling agent is between calcium carbonate (framework material, inorganic interface) and adhesive (polymer material, organic interface), a 'molecular bridge' can be erected between the interfaces of inorganic substances and organic substances to form organic matrix-water-based silane coupling agent-The bonding layer of the inorganic matrix has the functions of improving the performance of the composite material and increasing the bonding strength by connecting two materials with different properties.
In the present embodiment, a thickener is added to the second intermediate coating material, and the hydrophobic property of the coating material can be further improved by trapping hydroxyl groups and carboxyl groups between different materials with the thickener, thereby preventing water molecules or water vapor from penetrating into the coating layer.
Wherein, in all the steps of obtaining the coating, the temperature of the raw materials is controlled to be 40-50 ℃ when stirring.
Through a large number of experiments, the inventor of the application finds that when the temperature is controlled to be 40-50 ℃, the raw materials are stirred, so that the reaction among different materials can be more sufficient, and the performance of the obtained coating is more excellent.
Compared with the prior art, the water-resistant agent is added into the coating, so that the water solubility of the coating pigment and the adhesive after drying and film forming can be reduced, the wet-resistant friction performance of an adhesive film is improved, and the coating has certain water-resistant performance; furthermore, the tackifier is added into the coating, so that the bonding strength between the coating pigment and the adhesive can be improved through the synergistic effect of the tackifier, and the coating can obtain better water resistance.
The application also provides coated paper, and the coating used for the coating of the coated paper comprises the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier.
Wherein the water repellent agent comprises an organic water repellent agent and an inorganic water repellent agent.
Wherein the organic water repellent comprises a chemically cross-linked copolymer.
Specifically, the chemically crosslinked copolymer includes glyoxal, melamine glyoxal resin, melamine formaldehyde resin, polyamide polyamine epichlorohydrin, polyamide polyurea resin, and the like.
For example, when the coating comprises melamine glyoxal resin, new bonding bonds such as covalent bonds, hydrogen bonds and the like can be formed between active hydroxyl groups in the melamine glyoxal resin and paper fibers, and the fibers are connected in a cross-chain manner, so that the paper can obtain a moisture enhancement effect; furthermore, the melamine glyoxal resin can generate a staggered chain network structure around the paper fibers, and the coated paper has certain water resistance by reducing the swelling and water absorption speed of the paper fibers.
Wherein the adhesion promoter comprises an aqueous silane coupling agent, and/or a polyamide resin, and/or an isocyanate.
The function principle of the tackifier is that the tackifier has two groups per se: a group can be bonded to the bonded backbone material; the other group can be combined with a high polymer material or an adhesive, and a chemical bond with higher strength is formed on an adhesive interface, so that the adhesive strength among different materials in the coating can be enhanced, the adhesive strength between the coating and paper can be enhanced, water molecules in the environment are further prevented from permeating among paper fibers, the influence of the environmental humidity on the coated paper can be reduced by further improving the water resistance of the coated paper, and the problem of warping deformation of the coated paper is effectively solved.
Different from the prior art, the coating of the coated paper comprises the water-resistant agent and the tackifier, the water-resistant agent can reduce the water solubility of the coating pigment and the tackifier after drying and film forming, the wet friction resistance and the surface strength of the coated paper are improved, the tackifier can enhance the bonding strength among different materials in the coating and enhance the bonding strength between the coating and the fiber base paper, so that the coated paper has more excellent water resistance, and the problem of warping deformation of the coated paper is effectively solved.
Correspondingly, the application provides a preparation method of the coated paper.
Specifically, referring to fig. 2, fig. 2 is a schematic flow chart of an embodiment of a method for preparing coated paper of the present application, wherein the method comprises:
s21: preparing the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier.
S22: and mixing the calcium carbonate and the starch according to the raw material ratio, uniformly stirring, adding the latex according to the raw material ratio, and uniformly stirring again to obtain the first intermediate coating.
In a preferred embodiment, starch is used in an amount of 0 part in order to improve the water resistance of the coating.
S23: and adding a water repellent agent in the first intermediate coating according to the raw material ratio, and uniformly stirring to obtain a second intermediate coating.
In this embodiment, the water-repellent agent includes an organic water-repellent agent and an inorganic water-repellent agent.
Wherein the organic water repellent comprises a chemically cross-linked copolymer.
Specifically, the chemically crosslinked copolymer includes glyoxal, melamine glyoxal resin, melamine formaldehyde resin, polyamide polyamine epichlorohydrin, polyamide polyurea resin, and the like.
In a preferred embodiment, the added organic water repellent agent includes at least two of the above compounds, which is not limited herein.
In another embodiment, the organic water repellent agent to be added is any of the above-mentioned compounds, and the present application does not limit the present invention.
In this embodiment, the water solubility of the coating pigment and the adhesive after drying and film forming can be reduced by adding the organic water repellent to the first intermediate coating.
Wherein the inorganic water repellent agent comprises zirconium carbonate salt.
In this embodiment, the wet abrasion resistance and the gloss of the adhesive film can be improved by adding zirconium carbonate to the first intermediate coating material.
In a preferred embodiment, the water repellent agent added includes at least one of a zirconium carbonate salt and a chemically cross-linked copolymer, which is not limited in this application.
S24: and adding the tackifier in the ratio of the raw materials into the second intermediate coating, and uniformly stirring to obtain the coating.
Wherein the adhesion promoter comprises an aqueous silane coupling agent, and/or a polyamide resin, and/or an isocyanate.
The function principle of the tackifier is that the tackifier has two groups per se: a group can be bonded to the bonded backbone material; the other group can be combined with a high polymer material or an adhesive, and a chemical bond with higher strength is formed on an adhesive interface, so that the adhesive strength among different materials in the coating can be enhanced, the adhesive strength between the coating and paper can be enhanced, water molecules in the environment are further prevented from permeating among paper fibers, the influence of the environmental humidity on the coated paper can be reduced by further improving the water resistance of the coated paper, and the problem of warping deformation of the coated paper is effectively solved.
For example, the aqueous silane coupling agent has the formula Y-R-Si (OR)3Wherein Y is an organofunctional group and SiOR is a siloxy group. The silane oxygen radical has reactivity to inorganic matters, and the organic functional group has reactivity or compatibility to organic matters, so when the water-based silane coupling agent is between calcium carbonate (framework materials and inorganic interfaces) and an adhesive (high polymer materials and organic interfaces), a molecular bridge can be erected between the interfaces of inorganic matters and organic matters to form a bonding layer of an organic matrix, the water-based silane coupling agent and the inorganic matrix, and the two materials with different properties are connected together to play roles in improving the performance of a composite material and increasing the bonding strength.
S25: fiber-based paper is prepared, and the fiber-based paper is coated with a coating material to obtain coated paper.
In the present embodiment, one-side coated paper can be obtained by coating one side of the fiber-based paper with a coating material.
The single-sided coated paper is coated and calendered on one side and rubberized on the other side, and the two sides of the paper have different properties, so that the single-sided coated paper is suitable for printing with two different sides.
In the present embodiment, the coating material is applied to both sides of the fiber base paper, and a double-sided coated paper can be obtained.
The double-sided coated paper is subjected to double-sided coating and calendaring treatment, has a glossy bottom surface and good dimensional stability, and is suitable for general color printing.
In the embodiment, the obtained coating with water resistance is used for coating the fiber-based paper, new bonding bonds such as covalent bonds, hydrogen bonds and the like can be formed between the active hydroxyl groups of the water-resistant agent in the coating and the paper fibers, the fibers are connected in a cross-chain mode, the paper can obtain a moisture-enhancing effect, a staggered chain-like network structure can be generated around the paper fibers, the swelling and water absorption speed of the fibers is reduced, and the coated paper has certain water resistance.
In the embodiment, the tackifier added into the coating can enhance the bonding strength between the coating and the paper, further prevent water molecules in the environment from permeating into the paper fibers, and further improve the water resistance of the coated paper, so that the influence of the environmental humidity on the coated paper can be reduced, and the problem of warping deformation of the coated paper can be effectively solved.
Different from the prior art, this application uses the coating including water repellent agent and tackifier to carry out the coating to fibre base paper and obtains coated paper, because the water repellent agent can reduce the water-solubility after coating pigment and adhesive drying film forming, improves coated paper's wet friction resistance ability and surface strength, and the tackifier can strengthen the adhesive strength between the different materials in the coating to and strengthen the adhesive strength of coating and fibre base paper, make coated paper possess more excellent water resistance. Through the synergistic effect of the water resisting agent and the tackifier in the coating, the influence of the environmental humidity on the coated paper can be reduced, and the problem of warping deformation of the coated paper is effectively solved.
The following non-limiting examples are provided to facilitate an understanding of the embodiments of the present application and are set forth in the detailed description to provide further explanation of the embodiments of the present application.
Example 1
Preparing the following raw materials by weight: 85 parts of calcium carbonate (GCC); 10 parts of latex; 4 parts of starch; 1 part of water repellent agent, wherein, 0.5 part of melamine glyoxal resin and 0.5 part of zirconium carbonate type water repellent agent are added; 0 part of tackifier; mixing calcium carbonate and starch according to the raw material ratio, uniformly stirring, adding latex according to the raw material ratio, and uniformly stirring again to obtain a first intermediate coating; adding a water repellent agent in the first intermediate coating according to the raw material ratio and uniformly stirring to obtain a final coating; fiber-based paper was prepared, and the fiber-based paper was coated with the coating material to obtain coated paper.
Example 2
Preparing the following raw materials by weight: 85 parts of calcium carbonate (GCC); 13 parts of latex; 0 part of starch; 2 parts of water repellent agent, wherein 1.5 parts of glyoxal and 0.5 part of polyamide polyurea resin; 0 part of tackifier; mixing calcium carbonate and latex according to the raw material ratio and uniformly stirring to obtain a first intermediate coating; adding a water repellent agent in the first intermediate coating according to the raw material ratio and uniformly stirring to obtain a final coating; fiber-based paper was prepared, and the fiber-based paper was coated with the coating material to obtain coated paper.
Example 3
Preparing the following raw materials by weight: 85 parts of calcium carbonate (GCC); 10 parts of latex; 3 parts of starch; 0 part of water repellent agent; 2 parts of tackifier, wherein 0.5 part of water-based silane coupling agent and 1.5 parts of isocyanate type water repellent agent; mixing calcium carbonate and starch according to the raw material ratio, uniformly stirring, adding latex according to the raw material ratio, and uniformly stirring again to obtain a first intermediate coating; adding a tackifier in a ratio of raw materials into the first intermediate coating, and uniformly stirring to obtain a final coating; fiber-based paper was prepared, and the fiber-based paper was coated with the coating material to obtain coated paper.
Example 4
Preparing the following raw materials by weight: 85 parts of calcium carbonate (GCC); 13 parts of latex; 0 part of starch; 0 part of water repellent agent; 2 parts of tackifier, wherein 0.5 part of water-based silane coupling agent and 1.5 parts of polyamide polyepichlorohydrin resin; mixing calcium carbonate and latex according to the raw material ratio and uniformly stirring to obtain a first intermediate coating; adding a tackifier in a ratio of raw materials into the first intermediate coating, and uniformly stirring to obtain a final coating; fiber-based paper was prepared, and the fiber-based paper was coated with the coating material to obtain coated paper.
Example 5
Preparing the following raw materials by weight: 84 parts of calcium carbonate (GCC); 13 parts of latex; 0 part of starch; 1.5 parts of water repellent agent, wherein 1 part of glyoxal and 0.5 part of polyamide polyurea resin (PAPU) are added; 1.5 parts of tackifier, wherein 0.5 part of water-based silane coupling agent and 1 part of polyamide polyepichlorohydrin resin; mixing calcium carbonate and latex according to the raw material ratio and uniformly stirring to obtain a first intermediate coating; adding a water repellent agent in the first intermediate coating according to the raw material ratio and uniformly stirring to obtain a second intermediate coating; adding a tackifier in a ratio of the raw materials into the second intermediate coating, and uniformly stirring to obtain a final coating; fiber-based paper was prepared, and the fiber-based paper was coated with the coating material to obtain coated paper.
Example 6
Preparing the following raw materials by weight: 84 parts of calcium carbonate (GCC); 13 parts of latex; 0 part of starch; 1.5 parts of water repellent agent, wherein 0.5 part of glyoxal and 1 part of polyamide polyurea resin (PAPU); 1.5 parts of tackifier, wherein 1 part of water-based silane coupling agent and 0.5 part of polyamide polyepichlorohydrin resin; mixing calcium carbonate and latex according to the raw material ratio and uniformly stirring to obtain a first intermediate coating; adding a water repellent agent in the first intermediate coating according to the raw material ratio and uniformly stirring to obtain a second intermediate coating; adding a tackifier in a ratio of the raw materials into the second intermediate coating, and uniformly stirring to obtain a final coating; fiber-based paper was prepared, and the fiber-based paper was coated with the coating material to obtain coated paper.
Control group
Preparing the following raw materials by weight: 85 parts of calcium carbonate (GCC); 10 parts of latex; 5 parts of starch; 0 part of water repellent agent; 0 part of tackifier; mixing calcium carbonate and starch according to the raw material ratio, uniformly stirring, adding latex according to the raw material ratio, and uniformly stirring again to obtain a final coating; fiber-based paper was prepared, and the fiber-based paper was coated with the coating material to obtain coated paper.
For the coated papers produced in the above examples 1 to 6 and the control group, the warp height of each sheet and the smoothness of the paper stack were tested under different humidity conditions, and the test results are shown in the following table:
note: (1) the delta value is the difference between the high humidity warp value and the low humidity warp value and represents the deformation amplitude of the paper in the humidity change process. The larger the value is, the larger the influence of humidity on the warping and deformation of the paper is; (2) the smoothness (grade) of the paper stack refers to the warping condition of the paper stack, and the larger the numerical value is, the poorer the smoothness is, and the more severe the warping is.
As can be seen from the above table, when the fiber-based paper is coated with the coating only added with the water repellent agent or the tackifier, the obtained coated paper has certain improvement in the problems of paper warpage and deformation compared with the coated paper without the water repellent agent and the tackifier added in the coating; the fiber-based paper is coated by using the coating added with the water repellent agent and the tackifier, and compared with the obtained coated paper in which only the water repellent agent or the tackifier is added into the coating, the problems of paper warping and deformation are further improved.
According to the analysis, the coating and the coated paper provided by the application have the advantages that the coating raw materials comprise the water repellent agent and the tackifier, the water repellent agent and the tackifier have a synergistic effect, so that the produced coated paper is high in water resistance, and the problems of serious warping deformation and the like can be avoided when the difference between the environmental humidity and the paper roll humidity exists.
The above description is only for the purpose of illustrating embodiments of the present application and is not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application or are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. The coating is characterized by comprising the following raw materials in parts by weight:
30-90 parts of calcium carbonate;
5-20 parts of latex;
0-15 parts of starch;
0.5-5 parts of water repellent agent;
0.5-5 parts of tackifier.
2. The coating of claim 1, wherein the water repellent agent comprises an organic water repellent agent and an inorganic water repellent agent.
3. The coating of claim 2, wherein the organic water repellent agent comprises a chemically cross-linked copolymer.
4. The coating of claim 2, wherein the inorganic water repellent agent comprises a zirconium carbonate salt.
5. The coating of claim 1, wherein the adhesion promoter comprises an aqueous silane coupling agent, and/or a polyamide resin, and/or an isocyanate.
6. A preparation method of the coating is characterized by comprising the following steps:
preparing the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier;
mixing the calcium carbonate and the starch according to the raw material ratio, uniformly stirring, adding the latex according to the raw material ratio, and uniformly stirring again to obtain a first intermediate coating;
adding the water repellent agent in the first intermediate coating according to the raw material ratio and uniformly stirring to obtain a second intermediate coating;
and adding the tackifier in the second intermediate coating according to the raw material ratio, and uniformly stirring to obtain the coating.
7. The method for producing a dope according to claim 6, wherein the temperature at the time of stirring is controlled to 40 ℃ to 50 ℃.
8. The coated paper is characterized in that a coating used for a coating of the coated paper comprises the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier.
9. A method of making coated paper, comprising:
preparing the following raw materials in parts by weight: 30-90 parts of calcium carbonate; 5-20 parts of latex; 0-15 parts of starch; 0.5-5 parts of water repellent agent; 0.5-5 parts of tackifier;
mixing the calcium carbonate and the starch according to the raw material ratio, uniformly stirring, adding the latex according to the raw material ratio, and uniformly stirring again to obtain a first intermediate coating;
adding the water repellent agent in the first intermediate coating according to the raw material ratio and uniformly stirring to obtain a second intermediate coating;
adding the tackifier in the ratio of the raw materials into the second intermediate coating, and uniformly stirring to obtain the coating;
preparing fiber-based paper, and coating the fiber-based paper with the coating to obtain the coated paper.
10. The method of claim 9, wherein the step of coating a fiber-based paper with the coating material to obtain the coated paper comprises:
coating one side of the fiber base paper by using the coating to obtain single-side coated paper; or coating the two sides of the fiber base paper by using the coating to obtain the double-sided coated paper.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758380A (en) * | 2012-06-26 | 2012-10-31 | 浙江金昌纸业有限公司 | Surface micro-coating agent for producing pure paper and non-woven paper and preparation method thereof |
| CN103362026A (en) * | 2013-07-15 | 2013-10-23 | 金华盛纸业（苏州工业园区）有限公司 | Coating for chromo board and coating method thereof |
| CN103410048A (en) * | 2013-08-22 | 2013-11-27 | 金东纸业（江苏）股份有限公司 | Papermaking coating, coated paper with the papermaking coating and production process of coated paper |
| CN105714599A (en) * | 2016-02-19 | 2016-06-29 | 山东源根化学技术研发有限公司 | Preparation method of light coated paper coating |
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2020
- 2020-08-18 CN CN202010832442.8A patent/CN112160186A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102758380A (en) * | 2012-06-26 | 2012-10-31 | 浙江金昌纸业有限公司 | Surface micro-coating agent for producing pure paper and non-woven paper and preparation method thereof |
| CN103362026A (en) * | 2013-07-15 | 2013-10-23 | 金华盛纸业（苏州工业园区）有限公司 | Coating for chromo board and coating method thereof |
| CN103410048A (en) * | 2013-08-22 | 2013-11-27 | 金东纸业（江苏）股份有限公司 | Papermaking coating, coated paper with the papermaking coating and production process of coated paper |
| CN105714599A (en) * | 2016-02-19 | 2016-06-29 | 山东源根化学技术研发有限公司 | Preparation method of light coated paper coating |
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Application publication date: 20210101 |