CN111206451A - Pulping method of papermaking pulp and pulping auxiliary preparation - Google Patents
Pulping method of papermaking pulp and pulping auxiliary preparation Download PDFInfo
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- CN111206451A CN111206451A CN201811399789.7A CN201811399789A CN111206451A CN 111206451 A CN111206451 A CN 111206451A CN 201811399789 A CN201811399789 A CN 201811399789A CN 111206451 A CN111206451 A CN 111206451A
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- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
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Abstract
The application discloses a pulping method of papermaking pulp and a pulping auxiliary preparation. This application is through adding biological enzyme and the macromolecular polymer who has hydroxyl in papermaking thick liquids, and the cellulose effect in order to degrade the cellulose in the cell wall of utilizing biological enzyme and fibre to the hydroxyl that utilizes macromolecular polymer takes place hydrogen bond with fibrous carboxyl and combines, makes fibrous contact combine more, thereby can promote paper fiber strength when reducing the defibrination energy consumption.
Description
Technical Field
The application relates to the technical field of papermaking, in particular to paper pulp and a pulping process thereof, and particularly relates to a pulping method and a pulping auxiliary preparation of papermaking pulp.
Background
It is known that pulp is a basic raw material for papermaking, and is a fibrous substance prepared from certain plants through various processing methods. The traditional pulping operation is adopted in the existing pulping process for pulping, so that the pulping strength is high, and the power consumption is large. In order to solve this problem, biological enzymes (also called biological pulping enzymes) are generally added in the paper making process.
The biological enzyme applied in the paper-making process is usually a complex enzyme preparation mainly comprising cellulase. The biological enzyme is generally added into a pulp dispersing groove during auxiliary pulping, and the interaction between the biological enzyme and the pulp fiber is realized by controlling the temperature, time, pH (hydrogen ion concentration index) and relevant conditions during reaction and the like. Specifically, the biological enzyme acts on cellulose in cell walls of the fibers, so that the cellulose is partially degraded, and the effects of cell wall stripping, fiber cutting and cell wall fibrillation in the refining process are facilitated, so that the refining energy consumption is reduced, and the refining cost is saved.
The pulp added with the biological enzyme needs lower refining energy consumption under the condition of the same freeness, so that the extrusion friction deformation between fibers is weakened in the refining process, more carboxyl groups of the fibers cannot be exposed, the contact bonding of the fibers is less, the fiber strength is not improved, and the paper strength is not improved. Therefore, the application of the biological enzyme technology in papermaking pulping is limited to a certain extent.
Disclosure of Invention
In view of the above, the present application provides a pulping method and a pulping auxiliary agent for papermaking pulp to improve the strength of paper fibers while reducing the energy consumption of pulping.
The pulping method of papermaking pulp of an embodiment of the application comprises the following steps:
providing papermaking slurry, wherein the papermaking slurry contains fibers;
adding a biological enzyme and a high molecular polymer with hydroxyl into the papermaking pulp, wherein the hydroxyl of the high molecular polymer is in hydrogen bond combination with the carboxyl of the fiber, and the biological enzyme acts with the cellulose in the cell wall of the fiber to degrade the cellulose;
and (3) carrying out pulping treatment on the papermaking pulp added with the biological enzyme and the high molecular polymer.
The beating assisting agent according to an embodiment of the present application includes a high molecular polymer having a hydroxyl group that is hydrogen-bonded to a carboxyl group of a fiber.
The application provides a pulping method of papermaking thick liquids and auxiliary preparation that beats, through add biological enzyme and the macromolecular polymer who has hydroxyl in papermaking thick liquids, utilize the cellulose effect in biological enzyme and fibrous cell wall to degrade the cellulose to the hydroxyl that utilizes macromolecular polymer takes place hydrogen bond with fibrous carboxyl and combines, makes fibrous contact combine more, thereby can promote paper fiber strength when reducing the defibrination energy consumption.
Drawings
Fig. 1 is a schematic flow chart of a method of beating a papermaking stock according to a first embodiment of the present application;
FIG. 2 is a schematic flow chart of a method of beating a papermaking stock according to a second embodiment of the present application;
fig. 3 is a schematic flow chart of a method of beating a papermaking stock according to a third embodiment of the present application.
Detailed Description
The primary objectives of the present application are: the high molecular polymer with hydroxyl is added into the papermaking pulp, and the hydroxyl of the high molecular polymer and the carboxyl of the fiber are subjected to hydrogen bond combination, so that the contact combination of the fiber is more, and the fiber strength of the paper is improved. And for the application of the biological enzyme technology in papermaking and pulping, namely, in the application scene that the cellulose in the cell walls of the biological enzyme and the fiber is degraded to reduce the pulping energy consumption, the added high molecular polymer can reduce the pulping energy consumption and simultaneously improve the paper fiber strength.
For this purpose, 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. It is to be understood that the specific embodiments described herein are for purposes of illustration only and are not limiting. Individual embodiments and features of the embodiments can be combined with one another without conflict. It should be further noted that, for the convenience of description, only some of the structures relevant to the present application are shown in the drawings, not all of the structures. 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.
Fig. 1 is a schematic flow chart of a method of beating a papermaking stock according to a first embodiment of the present application. As shown in fig. 1, the pulping method of the papermaking stock includes the following steps S11 to S13.
S11: providing papermaking pulp, wherein the papermaking pulp contains fibers.
The present application is not limited to the type of papermaking stock, which includes, for example, but is not limited to, wood pulp, straw pulp, hemp pulp, reed pulp, bamboo pulp, rag pulp, and the like.
S12: adding biological enzyme and macromolecular polymer with hydroxyl into papermaking pulp, wherein the hydroxyl of the macromolecular polymer is in hydrogen bond combination with the carboxyl of the fiber, and the biological enzyme acts with the cellulose in the cell wall of the fiber to degrade the cellulose.
S13: and (3) carrying out pulping treatment on the papermaking pulp added with the biological enzyme and the high molecular polymer.
In the papermaking pulp, the biological enzyme and cellulose in the cell walls of the fibers act to partially degrade the cellulose, so that the cellulose is beneficial to the stripping of the cell walls, the cutting of the fibers and the fine fibrosis of the cell walls in the refining process, the refining energy consumption is reduced, and the refining cost is saved.
Meanwhile, the hydroxyl of the high molecular polymer and the carboxyl of the fiber are in hydrogen bond combination, so that the contact combination of the fiber is more, namely the hydrogen bond contact combination during the paper forming is more, and the paper fiber strength is improved. Further, during the refining process, more carboxyl groups are exposed when the fiber is cut and fibrillated, so that the fiber is in contact with and combined with the high molecular polymer more, and the strength of the paper fiber is further improved.
Under the same pulping environment condition, compared with the paper prepared without adding the pulping auxiliary preparation prepared by proportioning the biological enzyme and the high molecular polymer, the strength (namely the tensile index) of the paper prepared by the method can be improved by about 5-10%.
The present application does not limit the specific types of the biological enzyme and the high molecular polymer, and only needs to meet the above pulping requirement, for example, the biological enzyme may be any one of pectinase, lipase, protease, cellulase, amylase, and catalase, and the high molecular polymer includes, but is not limited to, any one of polyacrylamide polymer, epoxy polymer, modified reinforced starch polymer, and cellulose polymer.
Fig. 2 is a schematic flow chart of a method of beating a papermaking stock according to a second embodiment of the present application. As shown in fig. 2, the pulping method of the papermaking stock includes the following steps S21 to S24.
S21: providing papermaking pulp, wherein the papermaking pulp contains fibers.
S22: proportioning the biological enzyme and a high molecular polymer according to a preset proportion, wherein hydroxyl of the high molecular polymer is used for carrying out hydrogen bond bonding with carboxyl of the fiber, and the biological enzyme is used for acting with cellulose in the cell wall of the fiber to degrade the cellulose.
S23: and adding the mixed solution of the biological enzyme and the high molecular polymer obtained by proportioning into the papermaking slurry, and then performing slurry dispersing treatment on the papermaking slurry.
S24: and (4) carrying out pulp grinding treatment on the papermaking pulp subjected to pulp scattering treatment.
On the basis of the description of the previous embodiment, in the embodiment, the biological enzyme and the high molecular polymer are proportioned in advance, in order to ensure the balance of two effects of reducing refining energy consumption and improving paper fiber strength, the proportioning ratio of the high molecular polymer and the biological enzyme is preferably 60-80%, and then the proportioned pulping auxiliary preparation is added into papermaking pulp in the pulp dispersing treatment process, wherein the addition amount of the pulping auxiliary preparation can be 500-1200 ppm.
In an application scenario, the embodiment can be applied to papermaking pulp containing long fibers, short fibers and mechanical pulp, the long fibers, the short fibers and the mechanical pulp can be subjected to pulp dispersing treatment in a batch mode, wherein the short fibers and the long fibers can be subjected to pulp grinding treatment by disc type pulp grinders, the pulp grinding concentration is 4.5-5.0%, the two pulp grinders are connected in series for pulp grinding treatment, and the mechanical pulp is reserved after passing through a fluffer. In the preparation of the pulp, the pulp may be prepared by mixing 60 to 100% of short fibers, 0 to 15% of long fibers and 0 to 25% of mechanical pulp. In the actual pulp mixing process, the same paper type basically keeps the same pulp mixing proportion of each fiber.
In order to ensure the activity of the biological enzyme in the pulping process, other parameters required by the pulping operation environment, such as pH, temperature and the like, are adjusted in the whole pulping process, and the incorporation of oxidative additives is avoided. Taking cellulase as an example, the pH value is preferably controlled to be 7-8 and the temperature is preferably controlled to be 45-55 ℃. In addition, when the standby slurry is retained for a long time, the time for the enzyme reaction of the biological enzyme can be controlled by adjusting the pH and the oxidizing property of the standby slurry in consideration of the activity of the biological enzyme.
In addition, considering the effect of the biological enzyme on the outer layer of the fiber cells, when the refining treatment is carried out, the refining power can be adjusted according to the freeness monitored in the actual field, and the power of two refiners is continuously kept to be evenly divided when the refining power is adjusted. In the same paper making period, the method maintains the basically stable throughput of the pulping machine so as to ensure the stable fiber quality after pulping.
With reference to this embodiment, taking a carbon paper made of 80gsm as an example, the content of long fibers in the paper making slurry is 10%, the content of short fibers is 85%, and the mechanical content is 5%, adding 500ppm of a pulping auxiliary agent obtained by proportioning a high molecular polymer and a biological enzyme when the short fibers are subjected to pulping treatment, and then controlling the time from the paper making slurry to a refiner for about 30 minutes to meet the requirement of the biological enzyme on degradation of the fibers, wherein the refiner for the pulping treatment adopts a double-disc series connection mode, the load power of the refiner and the load power of the refiner are both equal, and the freeness of the pulping environment is controlled to be 380-400 ml. The tensile index of the finally prepared paper is about 65 N.m/g, the tensile index is improved by about 10% compared with the paper obtained under the same environment without adding the pulping auxiliary preparation, and the refining energy consumption per ton of the paper is reduced by about 9% compared with the paper obtained under the same environment without adding the pulping auxiliary preparation.
Taking the double-sided offset paper for making 200gsm paper as an example, the long fiber proportion in the paper making pulp is 0%, the short fiber proportion is 90%, and the mechanical proportion is 10%, when the short fiber is subjected to pulp dispersing treatment, a pulping auxiliary preparation obtained by proportioning a high molecular polymer and a biological enzyme is added, the addition amount is 1000ppm, then the time from the paper making pulp to a pulping machine is controlled to be about 25 minutes so as to meet the requirement of the biological enzyme on the degradation of the fiber, the pulping machine for pulping treatment adopts a double-disc series connection mode, the load power of the pulping machine and the pulping machine is divided equally, and the freeness of the pulping environment is controlled to be 380-400 ml. The tensile index of the finally prepared paper is about 58N m/g, and is improved by about 5 percent compared with the paper obtained under the same environment without adding the pulping auxiliary preparation, and the refining energy consumption per ton of the paper obtained under the same environment without adding the pulping auxiliary preparation is reduced by about 10 percent.
Fig. 3 is a schematic flow chart of a method of beating a papermaking stock according to a third embodiment of the present application. As shown in fig. 3, the pulping method of the papermaking stock includes the following steps S31 to S34.
S31: providing papermaking pulp, wherein the papermaking pulp contains fibers.
S32: adding biological enzyme into the papermaking pulp, and performing pulp dispersing treatment on the papermaking pulp, wherein the biological enzyme is used for acting with cellulose in cell walls of fibers to degrade the cellulose.
S33: and adding a high molecular polymer into the papermaking pulp subjected to pulp dispersing treatment, wherein the hydroxyl of the high molecular polymer is used for hydrogen bond bonding with the carboxyl of the fiber.
S34: and (3) carrying out pulp grinding treatment on the papermaking pulp added with the high molecular polymer.
On the basis of the description of the previous embodiment, but different from the above, the present embodiment separately adds the bio-enzyme and the high molecular polymer, that is, the bio-enzyme is added in the pulp dispersing process, and the high molecular polymer is added after the pulp dispersing and before the refining process. In order to ensure the effect of improving the fiber strength of paper, the addition amount of the high molecular polymer is preferably 0.5 to 1.0kg/t of oven dry pulp.
Taking a double-sided offset paper for making 120gsm paper as an example, the long fiber proportion in the paper making pulp is 10%, the short fiber proportion is 70%, and the mechanical proportion is 20%, adding biological enzyme when the short fiber is subjected to pulp scattering treatment, wherein the addition amount of the biological enzyme is 300ppm, controlling the time of the paper making pulp to a pulp grinder for about 25 minutes to meet the degradation requirement of the biological enzyme on the fiber, adding high polymer before pulp grinding, wherein the addition amount of the high polymer is 0.5-1.0 kg/t of absolute dry pulp, and then performing pulp grinding treatment. The pulping machine for pulping adopts a double-disc series connection mode, the load power of the pulping machine and the double-disc series connection mode is uniform, and the freeness of a pulping environment is controlled to be 400-420 ml. The tensile index of the finally prepared paper is about 52N m/g, which is about 7% higher than that of the paper obtained under the same environment without adding the pulping auxiliary agent, and the refining energy consumption per ton of the paper obtained under the same environment without adding the pulping auxiliary agent is about 11% lower than that of the paper obtained under the same environment without adding the pulping auxiliary agent.
The present application also provides a beating assisting agent comprising a high molecular polymer containing a hydroxyl group hydrogen-bonded to a carboxyl group of a fiber. The pulping auxiliary preparation can be added into papermaking pulp before a pulping process, and hydroxyl groups of the high molecular polymer and carboxyl groups of fibers are subjected to hydrogen bond combination, so that the contact combination of the fibers is more, namely the hydrogen bond contact combination during paper forming is more, and the strength of the paper fibers is improved. Further, during the refining process, more carboxyl groups are exposed when the fiber is cut and fibrillated, so that the fiber is in contact with and combined with the high molecular polymer more, and the strength of the paper fiber is further improved.
The present application does not limit the specific type of the high molecular polymer, which may be, for example, but not limited to, any one of polyacrylamide polymer, epoxy polymer, modified reinforced starch polymer, and cellulose polymer, as long as the above-mentioned papermaking pulping requirements are met.
The present application further provides another beating assisting agent comprising a high-molecular polymer and a bio-enzyme for acting with cellulose in cell walls of said fibers to degrade said cellulose, the high-molecular polymer containing a hydroxyl group hydrogen-bonded to a carboxyl group of the fibers.
In order to ensure the balance of two effects of reducing refining energy consumption and improving paper fiber strength, the proportioning ratio of the high molecular polymer and the biological enzyme is preferably 60-80%, and then the proportioning pulping auxiliary preparation is added into papermaking pulp in the pulp dispersing treatment process, wherein the addition amount of the pulping auxiliary preparation can be 500-1200 ppm.
In the papermaking pulp, the biological enzyme and cellulose in the cell walls of the fibers act to partially degrade the cellulose, so that the cellulose is beneficial to the stripping of the cell walls, the cutting of the fibers and the fine fibrosis of the cell walls in the refining process, the refining energy consumption is reduced, and the refining cost is saved.
Meanwhile, the hydroxyl of the high molecular polymer and the carboxyl of the fiber are in hydrogen bond combination, so that the contact combination of the fiber is more, namely the hydrogen bond contact combination during the paper forming is more, and the paper fiber strength is improved. Further, during the refining process, more carboxyl groups are exposed when the fiber is cut and fibrillated, so that the fiber is in contact with and combined with the high molecular polymer more, and the strength of the paper fiber is further improved.
The present application does not limit the specific types of the biological enzyme and the high molecular polymer, and only needs to meet the above pulping requirement, for example, the biological enzyme may be any one of pectinase, lipase, protease, cellulase, amylase, and catalase, and the high molecular polymer includes, but is not limited to, any one of polyacrylamide polymer, epoxy polymer, modified reinforced starch polymer, and cellulose polymer.
It is understood that, during the beating process, using the beating aid formulations of the two previous examples, in order to ensure the activity of the biological enzymes during the beating process, the present application also needs to adjust other parameters required for the beating operation environment, such as pH and temperature, etc., throughout the beating process, and to avoid the incorporation of oxidative additives. For example, in the embodiment, the pH value is preferably controlled to be 7-8 and the temperature is preferably controlled to be 45-55 ℃. In addition, when the standby slurry is retained for a long time, the time for the enzyme reaction of the biological enzyme can be controlled by adjusting the pH and the oxidizing property of the standby slurry in consideration of the activity of the biological enzyme. And because high molecular polymer's structural performance is stable, this application does not need additionally to carry out the too much control and adjustment of environmental parameter when utilizing biological enzyme technique to carry out the papermaking beating, consequently can not increase extra cost.
The above-mentioned embodiments are only examples of the present application, and not intended to limit the scope of the present application, and all equivalent structures or equivalent flow transformations made by the contents of the specification and the drawings, such as the combination of technical features between the embodiments and the direct or indirect application to other related technical fields, are also included in the scope of the present application.
Claims (10)
1. A method of pulping papermaking pulp, characterized in that the method comprises:
providing papermaking slurry, wherein the papermaking slurry contains fibers;
adding a biological enzyme and a high molecular polymer with hydroxyl into the papermaking pulp, wherein the hydroxyl of the high molecular polymer is in hydrogen bond combination with the carboxyl of the fiber, and the biological enzyme acts with the cellulose in the cell wall of the fiber to degrade the cellulose;
and (3) carrying out pulping treatment on the papermaking pulp added with the biological enzyme and the high molecular polymer.
2. The beating method according to claim 1, wherein the step of adding a biological enzyme and a high molecular polymer having hydroxyl groups to the papermaking slurry comprises:
proportioning the biological enzyme and the high molecular polymer according to a predetermined proportion;
and adding the mixed solution of the biological enzyme and the high molecular polymer obtained by proportioning into the papermaking slurry, and then performing slurry dispersing treatment on the papermaking slurry.
3. The pulping method according to claim 2, wherein the ratio of the high molecular polymer to the biological enzyme is 60-80%.
4. The beating method according to claim 1, wherein the step of adding a biological enzyme and a high molecular polymer having hydroxyl groups to the papermaking slurry comprises:
adding biological enzyme into the papermaking pulp, and performing pulp dispersing treatment on the papermaking pulp;
and adding a high molecular polymer into the papermaking pulp subjected to pulp dispersing treatment.
5. The pulping method according to claim 4, wherein the addition amount of the high molecular polymer is 0.5 to 1.0 kg/ton of oven dry pulp.
6. The pulping method according to any one of claims 1 to 5, wherein the high-molecular polymer includes any one of a polyacrylamide-based polymer, an epoxy-based polymer, a modified reinforced starch-based polymer, and a cellulose-based polymer.
7. A beating assisting preparation, characterized in that the beating assisting preparation comprises a high molecular polymer containing a hydroxyl group that is hydrogen-bonded to a carboxyl group of a fiber.
8. The pulp assisting preparation according to claim 7, further comprising a bio-enzyme for acting with cellulose in cell walls of the fibers to degrade the cellulose.
9. The pulping auxiliary preparation according to claim 8, wherein the ratio of the high molecular polymer to the biological enzyme is 60-80%.
10. The beating aid preparation according to any one of claims 7 to 9, wherein said high-molecular polymer comprises any one of a polyacrylamide-based polymer, an epoxy-based polymer, a modified reinforced starch-based polymer, and a cellulose-based polymer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112227105A (en) * | 2020-09-02 | 2021-01-15 | 金东纸业（江苏）股份有限公司 | Papermaking pulp processing method, paper preparation method and paper |
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Application publication date: 20200529 |