CN115125770A - Recyclable white cardboard and preparation method thereof - Google Patents

Recyclable white cardboard and preparation method thereof Download PDF

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Publication number
CN115125770A
CN115125770A CN202210930835.1A CN202210930835A CN115125770A CN 115125770 A CN115125770 A CN 115125770A CN 202210930835 A CN202210930835 A CN 202210930835A CN 115125770 A CN115125770 A CN 115125770A
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pulp
paper
sizing agent
white cardboard
sizing
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Chinese (zh)
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金明达
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Guangdong Jiufa Technology Co ltd
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Guangdong Jiufa Technology Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/02—Methods of beating; Beaters of the Hollander type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/303—Double disc mills
    • 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
    • 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
    • D21H17/69—Water-insoluble compounds, e.g. fillers, pigments modified, e.g. by association with other compositions prior to incorporation in the pulp or 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
    • D21H21/16—Sizing or water-repelling agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material

Abstract

The invention relates to the technical field of white cardboard production, in particular to a recyclable white cardboard and a preparation method thereof. The white cardboard comprises a surface layer, a core layer and a bottom layer, wherein the surface layer and the bottom layer are made of surface pulp, and the core layer is made of core pulp; the flour paste comprises the following raw materials: bleaching softwood pulp and hardwood pulp, and adding a modified filler and a sizing agent into the surface pulp; the core pulp wraps the bamboo pulp and bleaches the softwood pulp fiber, and add modified filler and sizing agent; the modified filler is calcium carbonate subjected to surface modification by adopting cationic polyamide polyamine resin polymers; the sizing agent adopts at least one of AKD, ASA and rosin sizing agents, and the cationic polyamide polyamine resin polymer is used for surface modification of calcium carbonate, so that the dosage of the sizing agent can be reduced, the physical properties of paper can be improved, and the liquid penetration resistance of the paper can be improved.

Description

Recyclable white cardboard and preparation method thereof
Technical Field
The invention relates to the technical field of white cardboard production, in particular to a recyclable white cardboard and a preparation method thereof.
Background
White cardboard, which refers to single-layer or multi-layer combined recyclable paper manufactured completely by bleaching chemical pulping and fully sized; the white cardboard is a high-grade packaging material, has the characteristics of high technical content, high quality requirement and high production difficulty, and is mainly used for the external packaging of small-sized high-grade commodities and high value-added products, such as cigarettes, cosmetics, medicines, high-grade gifts and the like.
In the production of the white cardboard, the optical performance of the paper is improved by adding inorganic fillers such as calcium carbonate and the like, but with the increase of the using amount of the fillers, the fillers can block the combination among fibers to cause great reduction of the tensile index, bursting strength and folding strength of the paper, and in addition, the phenomena of hair and powder falling are often caused because the adsorption force of the inorganic fillers and the fibers is weak; most of the sizing agent can generate sizing action only by being fixed on the fiber through reaction with the fiber, and after part of the sizing agent is absorbed by the filler, the absorption and reaction of the sizing agent on the fiber are reduced, so the original sizing effect can not be achieved; and the filler with small particle size generates more and thinner capillaries in the paper, and also improves the liquid permeability of the paper to a certain extent, which affects the sizing effect, so a preparation method of the white cardboard is needed to improve the defects of the prior art.
Disclosure of Invention
The invention aims to provide a recyclable white cardboard and a preparation method thereof, so as to solve the problems in the background art.
In order to achieve the above objects, in one aspect, the present invention provides a recyclable white cardboard, comprising a white cardboard, wherein the white cardboard comprises a surface layer, a core layer and a bottom layer, the surface layer and the bottom layer are made of surface pulp, and the core layer is made of core pulp; the flour paste comprises the following raw materials in parts by weight: 18-38 parts of bleached softwood pulp and 52-82 parts of hardwood pulp, and 15-25 parts of modified filler and 0.4-1.5 parts of sizing agent are added into the surface pulp;
the core pulp comprises 100% of bamboo pulp bleached softwood pulp fibers, 15-25 parts of modified filler and 0.4-1.5 parts of sizing agent are added, and the modified filler can reduce the using amount of the sizing agent, reduce the using amount of the sizing agent and reduce the thickness of paper;
the modified filler is calcium carbonate subjected to surface modification by adopting cationic polyamide polyamine resin polymers;
the sizing agent is at least one of AKD sizing agent, ASA sizing agent and rosin sizing agent.
In another aspect, the present invention provides a recyclable white cardboard and a manufacturing process thereof, including any one of the recyclable white cardboard described above, wherein the recyclable white cardboard is characterized in that: the method comprises the following operation steps:
s1, preparing slurry: pulping the pulp by adopting a double-disc pulping machine in series; the surface pulp adopts a semi-sticky semi-dissociative pulping mode of properly cutting and fluffing fibers, so that the fibers are easy to dewater on a net, the dispersibility is good, white card paper surfaces and bottom layers with good evenness, moderate strength and moderate absorptivity are produced, the core pulp is kneaded at a low speed and high concentration by a light knife to form better inner fibrillation and devillicate fibrillation, the fiber length is kept as much as possible, and the white card paper has certain stiffness.
S2, preparing slurry: mixing bleached softwood pulp and hardwood pulp, adding a modified filler and a sizing agent into the mixed pulp, and mixing to prepare surface pulp;
the core pulp is prepared by adding modified filler and sizing agent into 100 percent of bamboo pulp bleached softwood pulp fiber and mixing.
S3, forming paper sheets: using a net paper machine, uniformly distributing the pulp on a forming net of the paper machine at uniform speed, concentration and pressure by an open type multi-pipe pulp flowing box; the pulp sprayed from the tube bundle type pulp flow box directly enters a gap between two nets running at constant speed, and is dewatered by the gravity of the pulp and then is squeezed and dewatered by the two nets. The inner sides of the two nets are provided with a plurality of net rollers or dewatering plates so as to gather the two nets and scrape off the filtered water; the qualified paper pulp is sent to a forming wire according to the requirements of a forming part of a paper machine, namely, paper materials are uniformly distributed along the width direction of the paper machine, and the uniform pressure distribution, the uniform speed distribution, the uniform flow distribution, the uniform concentration distribution and the directional controllability and the uniformity of fibers are ensured; effectively disperse the pulp fiber and prevent the fiber from flocculation.
S4, squeezing and dehydrating: the formed paper is dewatered by three presses.
S5, drying and sizing: drying the paper by using a drying cylinder, applying glue on the surface of the paper by using a surface sizing machine after the drying is finished, and uniformly coating the glue on the front side and the back side of the paper by using the sizing machine; the paper is endowed with certain smoothness, surface strength and water resistance through surface sizing, the tensile property of the paper is increased to a certain extent, and the surface strength of the base paper and the smoothness of the base paper are improved.
S6, coating: coating paper for multiple times by adopting a scraper coating mode; three coatings are coated on the front surface, and the three coatings can ensure that the surface coating of the paper is uniform and stable, so that good printing quality is obtained; the coating can improve the color phase, whiteness, water absorption performance, glossiness, ink absorbability, smoothness, surface strength, roughness and the like of paper, and improve the printing adaptability of the paper.
S7, coiling: the paper is wound up using a winder.
As a further improvement of the present technical solution, in S1, the surface slurry: the beating degree is controlled to be 41-46 degrees SR, the humidity is 8-9g, the beating concentration is 2.5-3.5%, and the beating specific pressure is 0.5 MPa; core slurry: the beating degree is controlled to be 38-40 degrees SR, the humidity is 6.5-7.5g, the beating concentration is 2.5-3.5%, and the beating specific pressure is 0.3 MPa.
As a further improvement of the technical scheme, the sizing agent is added into the size before the filler is added, and then the filler is added into the diluted size, so that the sizing agent can be fully combined with the fiber in advance and distributed on the fiber; the adsorption of the sizing agent on the surface of the filler is reduced, and the adverse effect of the filler on the sizing agent is reduced.
As a further improvement of the technical proposal, the concentration of the upper and lower nets of the pulp is controlled within 0.3-0.5 percent to reduce fiber flocculation; the pulp speed and the wire speed ratio are controlled, in addition, the amplitude and the shaking frequency of the wire table are well controlled, so that the pulp is uniformly distributed, the forming wire speed is slow, and the paper formation uniformity is improved, thereby achieving the effect of improving the smoothness.
As a further improvement of the technical scheme, the three squeezing processes of the paper are as follows: the first pressing is vacuum blind hole pressing, and the dewatering amount can be increased by means of the vacuum degree of a vacuum system on the basis of mechanical pressure; the second press is a shoe press; and the third pressing is gloss pressing, and the gloss pressing is mainly used for finishing the paper to eliminate the net marks on the surface of the paper.
As a further improvement of the technical scheme, the moisture entering the drying cylinder is controlled to be 30-35%, and the line pressure between the smooth pressing roller and the drying cylinder is required to be more than 60 KN/m.
As a further improvement of the technical scheme, at least one of porcelain clay and calcium carbonate is adopted for coating the pigment coating, so that the paper obtains better glossiness and smoothness, and the ink absorption of the paper is improved.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the recyclable white cardboard and the preparation method thereof, the cationic polyamide polyamine resin polymer is used for carrying out surface modification on calcium carbonate, so that the dosage of a sizing agent can be reduced, the physical performance of paper can be improved, the liquid permeation resistance of the paper can be improved, and the reverse sizing can be lightened.
2. According to the recyclable white cardboard and the preparation method thereof, the cationic polyamide polyamine resin polymer forms a high polymer layer with a core-shell structure on the surface of calcium carbonate particles, so that calcium carbonate powder has a charge characteristic, a physical and chemical adsorption layer is formed on the surface of calcium carbonate, the calcium carbonate particles can be prevented from agglomerating, the dispersibility is improved, meanwhile, the cationic polyamide polyamine resin polymer contains a longer oleophylic carbon chain, has good compatibility with resin, strong interaction and good coupling effect, overcomes the defect of poor dispersibility of calcium carbonate in the using process, achieves the purpose of surface modification, and enhances the strength performance of paper sheets.
Drawings
Fig. 1 is a block diagram of a production process of a white cardboard according to embodiment 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiment 1 a recyclable white cardboard and a method for preparing the same, comprising the steps of:
1. preparing slurry: the pulp is pulped in series by adopting a double-disc pulping machine.
2. Slurry preparation: mixing 30 parts of bleached softwood pulp and 70 parts of hardwood pulp, and adding 15 parts of modified filler, 1.5 parts of sizing agent and 0.2 part of retention aid into the mixed slurry to mix to prepare surface slurry;
adding 15 parts of modified filler, 1.5 parts of sizing agent and 0.2 part of retention aid into 100% of bamboo pulp bleached softwood pulp fiber, and mixing to prepare core pulp;
3. forming paper sheets: using a gap-type paper machine, an open multi-tube headbox distributes the slurry evenly at a uniform speed, consistency and pressure over the forming wire of the machine.
4. Squeezing and dehydrating: the formed paper is dewatered by three presses.
5. Drying and sizing: drying the paper by adopting a drying cylinder, applying glue on the surface of the paper by a surface sizing machine after the drying is finished, and uniformly coating the glue on the front side and the back side of the paper by the sizing machine.
6. Coating: and (4) coating the paper for multiple times by adopting a blade coating mode.
7. Coiling: the paper is wound up using a winder.
Embodiment 2 a recyclable white cardboard and a method for preparing the same, comprising the steps of:
1. preparing slurry: the pulp is beaten by a double-disc pulping machine in series.
2. Slurry preparation: mixing 30 parts of bleached softwood pulp and 70 parts of hardwood pulp, and adding 18 parts of modified filler, 1.5 parts of sizing agent and 0.2 part of retention aid into the mixed pulp to mix and prepare surface pulp;
adding 18 parts of modified filler, 1.5 parts of sizing agent and 0.2 part of retention aid into 100% of bamboo pulp bleached softwood pulp fiber, and mixing to prepare core pulp;
3. paper sheet forming: using a gap-type paper machine, an open multi-tube headbox distributes the slurry evenly at a uniform speed, consistency and pressure over the forming wire of the machine.
4. Squeezing and dewatering: the formed paper is dewatered by three presses.
5. Drying and sizing: drying the paper by adopting a drying cylinder, applying glue on the surface of the paper by a surface sizing machine after the drying is finished, and uniformly coating the glue on the front side and the back side of the paper by the sizing machine.
6. Coating: and (4) coating the paper for multiple times by adopting a blade coating mode.
7. Coiling: the paper is wound up using a winder.
Embodiment 3 a recyclable white cardboard and a method for preparing the same, comprising the steps of:
1. preparing slurry: the pulp is pulped in series by adopting a double-disc pulping machine.
2. Slurry preparation: mixing 30 parts of bleached softwood pulp and 70 parts of hardwood pulp, and adding 20 parts of modified filler, 0.8 part of sizing agent and 0.2 part of retention aid into the mixed pulp to mix to prepare surface pulp;
adding 20 parts of modified filler, 0.8 part of sizing agent and 0.2 part of retention aid into 100% of bamboo pulp bleached softwood pulp fiber, and mixing to prepare core pulp;
3. paper sheet forming: using a gap-type paper machine, an open multi-tube headbox distributes the slurry evenly at a uniform speed, consistency and pressure over the forming wire of the machine.
4. Squeezing and dewatering: the formed paper is dewatered by three presses.
5. Drying and sizing: drying the paper by adopting a drying cylinder, applying glue on the surface of the paper by a surface sizing machine after the drying is finished, and uniformly coating the glue on the front side and the back side of the paper by the sizing machine.
6. Coating: and (4) coating the paper for multiple times by adopting a blade coating mode.
7. Coiling: the paper is wound up using a winder.
Embodiment 4 a recyclable white cardboard and a method for preparing the same, comprising the steps of:
1. preparing slurry: the pulp is beaten by a double-disc pulping machine in series.
2. Slurry preparation: mixing 30 parts of bleached softwood pulp and 70 parts of hardwood pulp, and adding 25 parts of modified filler, 0.8 part of sizing agent and 0.2 part of retention aid into the mixed pulp to mix to prepare surface pulp;
adding 25 parts of modified filler, 0.8 part of sizing agent and 0.2 part of retention aid into 100% of bamboo pulp bleached softwood pulp fiber, and mixing to prepare core pulp;
3. paper sheet forming: using a gap-type paper machine, an open multi-tube headbox distributes the slurry evenly at a uniform speed, consistency and pressure over the forming wire of the machine.
4. Squeezing and dewatering: the formed paper is dewatered by three presses.
5. Drying and sizing: drying the paper by adopting a drying cylinder, applying glue on the surface of the paper by a surface sizing machine after the drying is finished, and uniformly coating the glue on the front side and the back side of the paper by the sizing machine.
6. Coating: and (4) coating the paper for multiple times by adopting a blade coating mode.
7. Coiling: the paper is wound up using a winder.
Embodiment 5 a recyclable white cardboard and a method for preparing the same, comprising the steps of:
1. preparing slurry: the pulp is beaten by a double-disc pulping machine in series.
2. Slurry preparation: mixing 30 parts of bleached softwood pulp and 70 parts of hardwood pulp, and adding 25 parts of modified filler, 0.5 part of sizing agent and 0.2 part of retention aid into the mixed pulp to mix and prepare surface pulp;
adding 25 parts of modified filler, 0.5 part of sizing agent and 0.2 part of retention aid into 100% of bamboo pulp bleached softwood pulp fiber, and mixing to prepare core pulp;
3. forming paper sheets: using a gap-type paper machine, an open multi-tube headbox distributes the slurry evenly at a uniform speed, consistency and pressure over the forming wire of the machine.
4. Squeezing and dewatering: the formed paper is dewatered by three presses.
5. Drying and sizing: drying the paper by adopting a drying cylinder, applying glue on the surface of the paper by a surface sizing machine after the drying is finished, and uniformly coating the glue on the front side and the back side of the paper by the sizing machine.
6. Coating: and (4) coating the paper for multiple times by adopting a blade coating mode.
7. Coiling: the paper is wound up using a winder.
In the above examples 1-5, the cationic polyamide polyamine resin polymer surface-modifies calcium carbonate to be used as a modified filler, and the cationic polyamide polyamine resin polymer forms a high polymer layer with a core-shell structure on the surface of calcium carbonate particles to make calcium carbonate powder have a charge characteristic, and forms a physical and chemical adsorption layer on the surface of calcium carbonate to prevent calcium carbonate particles from agglomerating and improve dispersibility, and meanwhile, the cationic polyamide polyamine resin polymer contains a longer oleophilic carbon chain, has good compatibility with resin, strong interaction and good coupling effect, and improves the defect of poor dispersibility of calcium carbonate in the using process, thereby achieving the purpose of surface modification and making the strength performance of paper sheet higher;
in order to inhibit the paper lyophilic performance caused by the hydrophilicity of the fibers and the water absorption of the paper structure, a certain amount of sizing agent is usually added into a paper raw material, and the sizing agent adopts at least one of AKD, ASA and rosin sizing agents, so as to improve the resistance of the paper to liquid penetration, reduce the absorption of liquid during the paper processing (such as surface sizing and coating) as much as possible, or endow the finished paper with water repellency; meanwhile, the retention aid can adopt a single cationic polymer system, preferably cationic polyacrylamide CPAM, and the retention rate of the sizing agent can be increased by adding a certain amount of CPAM, the retention rate of the filler is increased, and the retention rate of the sizing agent is increased along with the increase of the retention rate, so that the adverse effect of the filler on the sizing agent is alleviated to a certain extent.
The sizing agent is added to the size mixture before the modified filler is added, and then the modified filler is added to the diluted size, so that the sizing agent can be fully combined with the fibers in advance and distributed on the fibers. The adsorption of the sizing agent on the surface of the filler is reduced, and the adverse effect of the filler on the sizing agent is reduced.
In order to reduce fibre flocculation, the concentration of upper and lower nets of pulp is controlled within 0.3-0.5%, the pulp speed and net speed ratio are controlled, and in addition, the amplitude and shaking frequency of net table are controlled, so that the pulp is uniformly distributed, the forming net speed is slightly slow, and the paper formation uniformity is improved, so that the effect of improving smoothness is achieved.
The three presses of the paper are: the first pressing is vacuum blind hole pressing, and the dewatering amount can be increased by means of the vacuum degree of a vacuum system on the basis of mechanical pressure; the second press is shoe press, the principle is that the press area is enlarged to prevent the paper from being crushed, and the press pressure can be greatly increased to increase the dewatering amount and improve the dryness of the paper web; the third pressing is gloss pressing, after the first two pressing, the water content of the paper is greatly reduced, and the paper is mainly finished through the gloss pressing, so that the net marks on the surface of the paper are eliminated.
When the paper just enters the drying cylinder, the water content of the white cardboard is high, the temperature of the drying cylinder is low, the water in the paper is slowly transferred and evaporated, after the paper is primarily dried by the drying cylinder, the paper is sent into the large cylinder, the water in the paper enters the drying cylinder is controlled to be 30-35%, and the linear pressure between the smooth pressing roller and the drying cylinder needs to be more than 60 KN/m. The coating pigment coating adopts at least one of porcelain clay and calcium carbonate, so that the paper obtains better glossiness and smoothness, and the ink absorption of the paper is improved.
The recyclable white cardboard prepared in the embodiments 1 to 5 of the present invention is prepared by mixing surface pulp and core pulp, wherein the surface pulp and the core pulp are added with modified filler, sizing agent and retention aid, and the quality of the white cardboard is affected by comparing the amount of the modified filler and the addition amount of the sizing agent, and the detection indexes of the recyclable white cardboard prepared in the embodiments 1 to 5 of the present invention are specifically shown in table 1:
TABLE 1
Figure BDA0003781347680000081
According to table 1, the optical curtain surface layer coating prepared by the invention has the advantages that 15-25 parts of modified filler is added in examples 1-5, which is enough to show that the prepared white cardboard has better physical properties, and when 20 parts of modified filler, 0.8 part of sizing agent and 0.2 part of retention aid are added in the mixed slurry to be mixed to prepare surface slurry, the dosage of the sizing agent is less, the thickness of the white cardboard is moderate, and the physical properties are better, so that the recyclable white cardboard prepared by the dosage of the material in example 3 has the best physical properties.
Comparative example 1
The comparative example provides a recyclable white cardboard, comprising in parts by weight: 30 parts of bleached softwood pulp and 70 parts of hardwood pulp, and 20 parts of calcium carbonate filler, 0.8 sizing agent and 0.2 retention aid are added into the mixed pulp;
adding 20 parts of calcium carbonate filler, 0.8 sizing agent and 0.2 retention aid into 100% of bamboo pulp bleached softwood pulp fiber; in contrast to examples 1-5, the calcium carbonate filler was not surface modified.
Comparative example 2
The comparative example provides a recyclable white cardboard, comprising in parts by weight: 30 parts of bleached softwood pulp and 70 parts of hardwood pulp, and 20 parts of calcium carbonate filler, 1.2 sizing agent and 0.2 retention aid are added into the mixed pulp;
adding 20 parts of calcium carbonate filler, 1.2 sizing agent and 0.2 retention aid into 100% of bamboo pulp bleached softwood pulp fiber;
the calcium carbonate filler was not surface modified and the amount of sizing agent added was increased compared to examples 1-5.
Comparative example 3
The comparative example provides a recyclable white cardboard, comprising in parts by weight: 30 parts of bleached softwood pulp and 70 parts of hardwood pulp, and 20 parts of cationic polyamide polyamine resin polymer surface modified calcium carbonate filler, 1.5 sizing agent and 0.2 retention aid are added into the mixed slurry;
adding 20 parts of cationic polyamide polyamine resin polymer surface modified calcium carbonate filler, 1.5 sizing agent and 0.2 retention aid into 100% of bamboo pulp bleached softwood pulp fiber;
the modified calcium carbonate filler was added in the same amount and the sizing agent was added in a different amount as compared to examples 1-5.
The recyclable white cardboard prepared by the invention has good physical properties, and has a large relationship with the added cationic polyamide polyamine resin polymer surface modified calcium carbonate filler and sizing agent, and in order to verify the related technical scheme, the applicant performs the following tests, and the specific test is shown in table 2:
TABLE 2
Figure BDA0003781347680000091
As shown in table 2, in comparative example 1, the calcium carbonate filler was not surface-modified, the physical properties of the paper were significantly insufficient compared to example 3, and the thickness of the paper was very thin, and therefore, it can be seen that the surface modification of the calcium carbonate filler by the cationic polyamide polyamine resin based polymer was an important factor affecting the quality of the white cardboard.
In comparative example 2, the addition amount of the sizing agent was increased alone without surface modification of the calcium carbonate filler, and therefore, it can be seen that a large amount of the sizing agent needs to be added to improve the quality of the ivory board, and at the same time, the increase of the sizing agent causes the increase of the thickness of the paper, and therefore, in comparative example 2, the thickness of the paper is sacrificed when improving the quality of the ivory board, and therefore, it can be seen that the addition amount of the sizing agent affects the thickness of the ivory board;
in comparative example 3, in the case of the surface modification of the calcium carbonate filler, the amount of the sizing agent added was increased, and therefore, it was found that the quality of the white cardboard was improved by increasing the amount of the sizing agent, and compared to example 3, the quality of the white cardboard was similar to that of the white cardboard by increasing the amount of the sizing agent added, but the thickness of the paper was increased by significantly increasing the amount of the sizing agent added, and therefore, it was found that the white cardboard meeting the quality standard was realized by adding less sizing agent in the case of the surface modification of the calcium carbonate filler.
To improve the opacity of the paper, improve paper smoothness and uniformity, increase paper softness, ink receptivity and printability, therefore, the filler is added into the slurry, the modified filler adopts calcium carbonate of which the surface is modified by the cationic polyamide polyamine resin polymer, the cationic polyamide polyamine resin polymer can be directionally adsorbed on the surface of the calcium carbonate powder, a high polymer layer with a core-shell structure is formed on the surface of calcium carbonate particles, so that the calcium carbonate powder has the charge characteristic, a physical and chemical adsorption layer is formed on the surface of the calcium carbonate, which can prevent the calcium carbonate particles from agglomerating and improve the dispersibility, meanwhile, the modified calcium carbonate paper contains longer oleophylic carbon chains, has good compatibility with resin, strong interaction and good coupling effect, overcomes the defect of poor dispersion performance of calcium carbonate in the using process, achieves the purpose of surface modification and ensures that the paper sheet has higher strength performance.
The cationic polyamide polyamine resin polymer is used for carrying out surface modification on calcium carbonate, so that the dosage of a sizing agent can be reduced, the length of a paper pulp fiber and the structure of paper are main factors influencing tearing strength, an unsized paper sample is relatively low in filler content and relatively small in tearing index due to relatively thick paper, and when the dosage of the sizing agent is increased from 0.5 part to 1.5 parts, the tearing index of the paper sample is reduced; the filler content is increased, the binding force of a paper sample is increased due to the increase of the cationic compound in the sizing agent, the paper is thicker, and if the dosage of the sizing agent is excessive, the tearing index of the paper sample is reduced. When the dosage of the sizing agent is increased, the color difference of the aged paper sample is increased, and the cationic polyamide polyamine resin polymer modified calcium carbonate filler can reduce the dosage of the sizing agent, reduce the dosage of the sizing agent and reduce the thickness of paper.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (9)

1. The recyclable white cardboard comprises a white cardboard and is characterized in that the white cardboard comprises a surface layer, a core layer and a bottom layer, wherein the surface layer and the bottom layer are made of surface pulp, and the core layer is made of core pulp; the flour paste comprises the following raw materials in parts by weight: 18-38 parts of bleached softwood pulp and 52-82 parts of hardwood pulp, and 15-25 parts of modified filler and 0.4-1.5 parts of sizing agent are added into the surface pulp;
the core pulp comprises 100% of bamboo pulp bleached softwood pulp fibers, and 15-25 parts of modified filler and 0.4-1.5 parts of sizing agent are added;
the modified filler is calcium carbonate subjected to surface modification by adopting cationic polyamide polyamine resin polymers;
the sizing agent is at least one of AKD, ASA and rosin sizing agent.
2. A process for making recyclable white cardboard, comprising the recyclable white cardboard as claimed in any one of claims 1, wherein the process comprises the steps of: the method comprises the following operation steps:
s1, preparing slurry: the pulp is pulped in series by adopting a double-disc pulping machine.
S2, slurry preparation: mixing bleached softwood pulp and hardwood pulp, adding a modified filler and a sizing agent into the mixed pulp, and mixing to prepare surface pulp;
the core pulp is prepared by adding a modified filler sizing agent into 100 percent of bamboo pulp bleached softwood pulp fiber and mixing.
S3, forming paper sheets: using a gap-type paper machine, an open multi-tube headbox distributes the slurry evenly at a uniform speed, consistency and pressure over the forming wire of the machine.
S4, squeezing and dehydrating: the formed paper is dewatered by three presses.
S5, drying and sizing: drying the paper by using a drying cylinder, applying glue on the surface of the paper by using a surface sizing machine after the drying is finished, and uniformly coating the glue on the front side and the back side of the paper by using the sizing machine; the paper is endowed with certain smoothness, surface strength and water resistance through surface sizing, the tensile property of the paper is increased to a certain extent, and the surface strength of the base paper and the smoothness of the base paper are improved.
S6, coating: and (4) coating the paper for multiple times by adopting a blade coating mode.
S7, coiling: the paper is wound up using a winder.
3. The recyclable white cardboard as claimed in claim 2, wherein the process comprises the steps of: in the S1, the surface pulp adopts a semi-sticky semi-dissociative pulping mode of properly cutting and properly raising and brooming fibers, and the core pulp is kneaded at low speed and high concentration by a light knife to form better inner brooming and devillicate brooming.
4. The recyclable white cardboard as claimed in claim 2, wherein the process comprises the steps of: in the step S1, the surface sizing: the beating degree is controlled to be 41-46 degrees SR, the humidity is 8-9g, the beating concentration is 2.5-3.5%, and the beating specific pressure is 0.5 MPa; core slurry: the beating degree is controlled to be 38-40 degrees SR, the humidity is 6.5-7.5g, the beating concentration is 2.5-3.5%, and the beating specific pressure is 0.3 MPa.
5. The recyclable white cardboard as claimed in claim 2, wherein the process comprises the steps of: in S2, the sizing agent is added to the size before the filler is added, and the filler is added to the diluted size, so that the sizing agent can be sufficiently combined with the fiber in advance and distributed on the fiber.
6. The recyclable white cardboard as claimed in claim 2, wherein the recyclable white cardboard comprises: in the S3, the concentration of the upper and lower nets of the slurry is controlled within 0.3-0.5%.
7. The recyclable white cardboard as claimed in claim 2, wherein the process comprises the steps of: in S4, the three-pass pressing of the paper sheet is: first pressing is vacuum blind hole pressing; the second press is a shoe press; the third pressing is gloss pressing.
8. The recyclable white cardboard as claimed in claim 2, wherein the process comprises the steps of: in the S5, the moisture entering the drying cylinder is controlled to be 30-35%, and the line pressure between the smooth pressing roll and the drying cylinder needs to be more than 60 KN/m.
9. The recyclable white cardboard as claimed in claim 2, wherein the process comprises the steps of: in the step S6, at least one of china clay and calcium carbonate is used as the coating pigment.
CN202210930835.1A 2022-08-04 2022-08-04 Recyclable white cardboard and preparation method thereof Withdrawn CN115125770A (en)

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CN202210930835.1A CN115125770A (en) 2022-08-04 2022-08-04 Recyclable white cardboard and preparation method thereof

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Application publication date: 20220930