CN110939013B - Method for manufacturing high-bulk gray board paper - Google Patents
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- CN110939013B CN110939013B CN201911299147.4A CN201911299147A CN110939013B CN 110939013 B CN110939013 B CN 110939013B CN 201911299147 A CN201911299147 A CN 201911299147A CN 110939013 B CN110939013 B CN 110939013B
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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
- D21H27/10—Packing paper
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H6/00—Macromolecular compounds derived from lignin, e.g. tannins, humic acids
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/14—Secondary fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/17—Ketenes, e.g. ketene dimers
-
- 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
- D21H17/23—Lignins
-
- 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
- D21H17/71—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes
- D21H17/74—Mixtures of material ; Pulp or paper comprising several different materials not incorporated by special processes of organic and inorganic 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
- 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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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biochemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Paper (AREA)
Abstract
The invention discloses a method for manufacturing high-bulk gray board paper, which comprises the following steps: removing impurities from the pulping black liquor, and concentrating to prepare lignin concentrated solution; performing cationization modification on the lignin concentrated solution to prepare cation modified lignin; OCC is used as a raw material, good pulp is obtained after paper shredding, pulp grinding and pulp screening, the cation modified lignin is added into the good pulp, the good pulp is fully stirred and mixed, AKD pulp is added for internal sizing after dilution, and the high-bulk gray board paper is obtained through a conventional papermaking process. The method disclosed by the invention can be used for keeping the strength of the paper product without additionally adding chemical additives such as reinforcing agents and the like while increasing the bulk, effectively reducing the production cost, avoiding greatly adjusting the original production process, and being simple to operate and good in industrialization prospect. In addition, the method also provides another effective application field for the comprehensive utilization of the pulping black liquor.
Description
Technical Field
The invention relates to the field of preparation of gray board paper, in particular to a method for manufacturing high-bulk gray board paper.
Background
The grey board is produced from recycled waste paper. The product is divided into single ash, double ash and full ash, and belongs to an environment-friendly packaging material. The gray board paper is mainly used for packaging boxes, advertising boards, folders, photo frame back boards, cases, hardcover books, storage boxes, samples, lining boards, partition boards and the like.
In recent years, paper manufacturers have paid more and more attention to the paper bulk index. Under the same conditions, a high bulk paper will bring about an increase in the caliper and softness of the paper. Because the high bulk paper can replace the original high-volume paper with the same thickness, the fiber raw materials are saved, the production cost and the transportation cost are reduced, and for a papermaking enterprise, if the high bulk paper can be achieved, the requirements of consumers on the use characteristics of the paper can be met while the production cost is reduced by using less fiber materials, and better economic benefits are brought to the enterprise.
OCC (old Corrugated container) is waste paper of old cartons, contains unbleached sulfate wood pulp and waste paper pulp, the surface layer of the OCC is mostly composed of unbleached sulfate wood pulp or superior kraft waste paper, and the Corrugated paper of the middle bottom layer is composed of Corrugated waste paper with poor texture, so that the recycling times are high. The paper pulp has high viscosity and low freeness, is used for recycling papermaking, and has high inevitably-tightness and low bulk, especially domestic OCC (optical fiber control), wherein the corrugated paper contains a plurality of grass fiber raw materials, has high hemicellulose content, and has small bulk after papermaking. Thus, OCC has no good effect on bulk, except that the lower content of unbleached wood pulp contributes to the bulk of the paper. Therefore, it is difficult to increase the bulk by OCC. Therefore, the bulk of the grey board is generally increased by mixing a large amount of ONP, but the addition of ONP can cause the reduction of properties such as strength and smoothness of the finished paper, thereby affecting the quality of the finished paper.
Lignin, a substance polymerized from aromatic alcohols, is present in woody tissues and primarily functions to harden the cell walls by forming a network of intersections, which is the primary component of secondary walls. The lignin is mainly located between the cellulose fibers and plays a role in supporting and resisting pressure. Because lignin has hydrophobicity, lignin existing on the surface of pulp fiber can prevent the formation of hydrogen bonds between cellulose molecules, so that the bonding strength between fibers is reduced, and the strength of formed paper is influenced, therefore, the wood pulp generally needs to remove the lignin by a chemical or physical method, and the lignin content in the wood pulp treated by lignin removal is less than 1%, so that the influence of the lignin on the strength of the formed paper, such as a swelling resistance index, a tearing index, a bursting index and the like, is eliminated. Soda pulping is one of the mainstream pulping methods, waste liquor (pulping black liquor) generated in the cooking process contains a large amount of lignin, but only a small amount of waste liquor is utilized in the current pulping and papermaking industry, and a large amount of pulping waste liquor is only used for burning and recovering energy. How to comprehensively utilize the pulping black liquor is one of the important topics of paper making enterprises. At present, no research report exists for modifying lignin in pulping black liquor and comprehensively utilizing the lignin in the process of manufacturing the grey board paper so as to improve the bulk of the grey board paper.
Disclosure of Invention
The present invention is directed to a method for making a high bulk gray paperboard, which overcomes the above-mentioned deficiencies of the prior art.
The invention is realized by the following technical scheme:
a method for manufacturing high-bulk gray board paper comprises the following steps:
1) removing impurities from the pulping black liquor, and concentrating to prepare lignin concentrated solution;
2) performing cationization modification on the lignin concentrated solution to prepare cation modified lignin;
3) OCC is used as a raw material, good pulp is obtained after paper shredding, pulp grinding and pulp screening, the cation modified lignin is added into the good pulp, the good pulp is fully stirred and mixed, AKD pulp is added for internal sizing after dilution, and the high-bulk gray board paper is obtained through a conventional papermaking process.
In step 1, the impurity removal is mainly to remove water insoluble substances and cellulose impurities in the pulping black liquor, and various impurities in the pulping black liquor can be removed by means commonly used in the field, and preferably, the impurity removal is performed by using a microfiltration membrane. The concentration is preferably performed by a membrane treatment method, for example, by concentrating the waste liquid by using an ultrafiltration membrane or a nanofiltration membrane. The concentration of the lignin concentrate is preferably 20-25 wt%.
In step 2, the preparation method of the cation modified lignin comprises the following steps:
mixing epoxy chloropropane, triethylamine, methanol, water and potassium sulfate, reacting for 2-3 hours at 40-50 ℃, adding the lignin concentrated solution into a reaction system, and continuing to react for 2-3 hours to obtain the cation modified lignin.
Preferably, the weight parts of the components are as follows:
methanol and water are used as the reaction solvent, and the amount thereof is not particularly limited, and may be adjusted by those skilled in the art according to the reaction conditions. For example, methanol is used in an amount of 50 to 100 parts by weight, and water is used in an amount of 100 to 200 parts by weight.
In step 3, pure OCC is used as a raw material for papermaking, wherein conventional processes in the field can be adopted in the steps of paper shredding, pulp grinding, pulp screening, papermaking and the like, and are not described herein again. The key point of the present invention is to add the cationic modified lignin to the pulp before sizing, and then to add various desirable in-pulp aids such as brighteners, reinforcing agents, sizing agents, fillers, and the like. The addition amount of the cation modified lignin is 2-5wt% of the oven dry amount of the pulp.
Preferably, the beating degree of the pulp is controlled to 45-50 ° SR in the refining step.
The inventors have found that the bulk of the grey board can be greatly increased with the strength of the paper remaining substantially unchanged. The method for manufacturing the high-bulk gray board keeps the strength of paper products without additionally adding chemical additives such as reinforcing agents and the like while improving the bulk, effectively reduces the production cost, does not need to greatly adjust the original production procedures, is simple to operate, and has good industrialization prospect. In addition, the method also provides another effective application field for the comprehensive utilization of the pulping black liquor.
Detailed Description
The invention is illustrated below by means of specific examples, without being restricted thereto. All the raw materials are conventional commercial products unless otherwise specified. The pulping black liquor is waste liquor obtained by soda pulping.
Example 1
A method for manufacturing high-bulk gray board paper comprises the following steps:
1) taking pulping black liquor, firstly removing large-particle-size impurities through primary filtration, then further removing water insoluble substances and cellulose impurities through a microfiltration membrane, and concentrating waste liquor through an ultrafiltration membrane to obtain lignin concentrated solution with the concentration of about 25 wt%;
2) mixing 100 parts by weight of epoxy chloropropane, 100 parts by weight of triethylamine, 75 parts by weight of methanol, 150 parts by weight of water and 2 parts by weight of potassium sulfate into a reaction kettle, heating to about 45 ℃, reacting for 2.5 hours, adding 400 parts by weight of the lignin concentrated solution into a reaction system, and continuously reacting for 2.5 hours to obtain cation modified lignin;
3) cleaning OCC waste paper, then sending the cleaned OCC waste paper into a pulper for crushing, and simultaneously adding white water, wherein the mass ratio of the white water to the waste paper is 4: 1; pulping the crushed paper pulp into a pulp grinder at the speed of 1200-1300r/min to ensure that the beating degree of the pulp reaches 45-50 DEG SR; screening the pulp through a pressure screen to obtain good pulp, adding the cation modified lignin into the good pulp, wherein the addition amount of the cation modified lignin is 3 wt% of the absolute dry amount of the pulp, fully stirring and mixing, diluting to the concentration of 4%, adding AKD pulp for internal sizing, and then feeding the pulp into a paper machine to obtain the high-bulk grey board through a conventional papermaking process.
Example 2
A method for manufacturing high-bulk gray board paper comprises the following steps:
1) taking pulping black liquor, firstly removing large-particle-size impurities through primary filtration, then further removing water insoluble substances and cellulose impurities through a microfiltration membrane, and concentrating waste liquor through an ultrafiltration membrane to obtain lignin concentrated solution with the concentration of about 20 wt%;
2) mixing 100 parts by weight of epoxy chloropropane, 120 parts by weight of triethylamine, 50 parts by weight of methanol, 100 parts by weight of water and 1 part by weight of potassium sulfate into a reaction kettle, heating to about 40 ℃, reacting for 3 hours, adding 350 parts by weight of the lignin concentrated solution into a reaction system, and continuously reacting for 3 hours to obtain cation modified lignin;
3) cleaning OCC waste paper, then sending the cleaned OCC waste paper into a pulper for crushing, and simultaneously adding white water, wherein the mass ratio of the white water to the waste paper is 4: 1; pulping the crushed paper pulp into a pulp grinder at the speed of 1200-1300r/min to ensure that the beating degree of the pulp reaches 45-50 DEG SR; screening the pulp through a pressure screen to obtain good pulp, adding the cation modified lignin into the good pulp, wherein the addition amount of the cation modified lignin is 2 wt% of the absolute dry amount of the pulp, fully stirring and mixing, diluting to the concentration of 4%, adding AKD pulp for internal sizing, and then feeding the pulp into a paper machine to obtain the high-bulk grey board through a conventional papermaking process.
Example 3
A method for manufacturing high-bulk gray board paper comprises the following steps:
1) taking pulping black liquor, firstly removing large-particle-size impurities through primary filtration, then further removing water insoluble substances and cellulose impurities through a microfiltration membrane, and concentrating waste liquor through an ultrafiltration membrane to obtain lignin concentrated solution with the concentration of about 25 wt%;
2) mixing 100 parts by weight of epoxy chloropropane, 120 parts by weight of triethylamine, 100 parts by weight of methanol, 200 parts by weight of water and 3 parts by weight of potassium sulfate into a reaction kettle, heating to about 50 ℃, reacting for 2 hours, adding 600 parts by weight of lignin concentrated solution into a reaction system, and continuously reacting for 2 hours to obtain cation modified lignin;
3) cleaning OCC waste paper, then sending the cleaned OCC waste paper into a pulper for crushing, and simultaneously adding white water, wherein the mass ratio of the white water to the waste paper is 4: 1; pulping the crushed paper pulp into a pulp grinder at the speed of 1200-1300r/min to ensure that the beating degree of the pulp reaches 45-50 DEG SR; screening the pulp through a pressure screen to obtain good pulp, adding the cation modified lignin into the good pulp, wherein the addition amount of the cation modified lignin is 5wt% of the absolute dry amount of the pulp, fully stirring and mixing, diluting to the concentration of 4%, adding AKD pulp for internal sizing, and then feeding the pulp into a paper machine to obtain the high-bulk grey board through a conventional papermaking process.
Comparative example 1
The procedure was as in step 3 of example 1 except that no cation-modified lignin was added.
Comparative example 2
Step 2 was omitted, i.e., the lignin was not cationically modified, and the concentrated lignin solution obtained in step 1 was added to the accept pulp instead of cationically modified lignin in step 3, and the other steps were the same as in step 1 and step 3 of example 1.
Paper forming property test
The bulk of the paper is measured by the methods of GB/T451.2-2002 and GB/T541.3-2002, and the ring crush strength index of the paper is measured by the method of GB/T2679.8-2016. The paper forming performance test data for each example and comparative example are shown in table 1:
TABLE 1
| Sample (I) | Bulk (cm)3/g) | Ring crush strength index (N. m/g) |
| Example 1 | 1.33 | 11.4 |
| Example 2 | 1.29 | 11.3 |
| Example 3 | 1.31 | 11.3 |
| Comparative example 1 | 1.02 | 11.5 |
| Comparative example 2 | 1.18 | 10.6 |
The test result shows that the bulk of the high-bulk gray board paper can be improved by 25-30%, and the strength of the paper is basically kept unchanged. The method disclosed by the invention can be used for keeping the strength of the paper product without additionally adding chemical additives such as reinforcing agents and the like while increasing the bulk of the gray board paper, effectively reducing the production cost, avoiding greatly adjusting the original production process, and being simple to operate and good in industrialization prospect. In addition, the method also provides another effective application field for the comprehensive utilization of the pulping black liquor.
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, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A method for manufacturing high bulk gray board paper is characterized by comprising the following steps:
1) Removing impurities from the pulping black liquor, and concentrating to prepare lignin concentrated solution;
2) performing cationization modification on the lignin concentrated solution to prepare cation modified lignin;
3) OCC is used as a raw material, good pulp is obtained after paper shredding, pulp grinding and pulp screening, the cation modified lignin is added into the good pulp, the good pulp is fully stirred and mixed, AKD pulp is added for internal sizing after dilution, and the high-bulk gray board paper is obtained through a conventional papermaking process;
in step 2, the preparation method of the cation modified lignin comprises the following steps: mixing epoxy chloropropane, triethylamine, methanol, water and potassium sulfate, reacting for 2-3 hours at 40-50 ℃, adding the lignin concentrated solution into a reaction system, and continuing to react for 2-3 hours to obtain the cation modified lignin;
the addition amount of the cation modified lignin is 2-5wt% of the oven dry amount of the accepts.
2. The method of claim 1, wherein in step 1, the impurities are removed using a microfiltration membrane.
3. The method of claim 1, wherein in step 1, the concentration is performed using an ultrafiltration membrane or a nanofiltration membrane.
4. The method of claim 1, wherein the lignin concentrate has a concentration of 20 to 25 wt%.
5. The method of claim 1, wherein the weight parts of each component are as follows:
100 portions of epoxy chloropropane,
120 portions of triethylamine,
70-150 parts of lignin,
1-3 parts of potassium sulfate,
Proper amount of methanol,
And a proper amount of water.
6. The method as claimed in claim 1, characterized in that in the refining step of step 3, the degree of beating of the pulp is controlled to be 45-50 ° SR.
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| CN113668271B (en) * | 2021-09-02 | 2023-08-11 | 浙江金龙再生资源科技股份有限公司 | High-bulk gray board paper and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131019A (en) * | 2012-12-29 | 2013-06-05 | 成都易态科技有限公司 | Method extracting lignin from paper making pulp and conducting chemical modification |
| CN104047203A (en) * | 2014-06-24 | 2014-09-17 | 马鞍山纽泽科技服务有限公司 | Technology for producing grey boards |
| CN104059233A (en) * | 2014-07-02 | 2014-09-24 | 江苏中烟工业有限责任公司 | New method for preparing solid lignin quaternary ammonium salt and application of solid lignin quaternary ammonium salt |
| CN110080031A (en) * | 2019-05-27 | 2019-08-02 | 联盛纸业（龙海）有限公司 | A kind of production technology of the compound dedicated core paper of advanced grey board |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103131019A (en) * | 2012-12-29 | 2013-06-05 | 成都易态科技有限公司 | Method extracting lignin from paper making pulp and conducting chemical modification |
| CN104047203A (en) * | 2014-06-24 | 2014-09-17 | 马鞍山纽泽科技服务有限公司 | Technology for producing grey boards |
| CN104059233A (en) * | 2014-07-02 | 2014-09-24 | 江苏中烟工业有限责任公司 | New method for preparing solid lignin quaternary ammonium salt and application of solid lignin quaternary ammonium salt |
| CN110080031A (en) * | 2019-05-27 | 2019-08-02 | 联盛纸业（龙海）有限公司 | A kind of production technology of the compound dedicated core paper of advanced grey board |
Non-Patent Citations (1)
| Title |
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| 生物质基造纸助留助滤剂的研究进展及其发展趋势;由耀辉等;《纸和造纸》;20160315;第22-27页 * |
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Address after: 324400 Sha lake, Lake Town, Longyou County, Quzhou, Zhejiang Patentee after: Zhejiang Jinlong Renewable Resources Technology Co.,Ltd. Address before: 324400 Sha lake, Lake Town, Longyou County, Quzhou, Zhejiang Patentee before: ZHEJIANG JINLONG PAPER Co.,Ltd. |