CN116949860B - A method for improving the performance of waste pulp with high lignin content - Google Patents
A method for improving the performance of waste pulp with high lignin content Download PDFInfo
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- CN116949860B CN116949860B CN202310455394.9A CN202310455394A CN116949860B CN 116949860 B CN116949860 B CN 116949860B CN 202310455394 A CN202310455394 A CN 202310455394A CN 116949860 B CN116949860 B CN 116949860B
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- waste paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/20—Chemically or biochemically modified 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
- 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
- D21H17/14—Carboxylic acids; Derivatives thereof
-
- 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
- D21H17/65—Acid compounds
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
Abstract
本发明属于废纸浆性能恢复领域，具体涉及一种改善高木质素含量废纸浆性能的方法，包括以下制备步骤：将废纸浆置于密封袋中，滴加乙酰乙酸丙酯到废纸浆中，并进行充分揉搓使其混合均匀；向混合均匀的废纸浆中加入硫酸溶液，进行充分揉搓使其混合均匀；混合均匀的废纸浆升温进行反应，反应期间进行揉搓，反应结束后用水洗涤，得到改性废纸浆。本发明工艺简单，易于操作，便于工业化应用，得到的改性废纸浆纤维的润胀性提高，改性后废纸浆成纸强度提高，拓展了废纸浆的应用场景。The present invention belongs to the field of waste paper pulp performance recovery, and specifically relates to a method for improving the performance of waste paper pulp with high lignin content, comprising the following preparation steps: placing waste paper pulp in a sealed bag, dripping propyl acetoacetate into the waste paper pulp, and kneading it thoroughly to make it evenly mixed; adding sulfuric acid solution to the evenly mixed waste paper pulp, and kneading it thoroughly to make it evenly mixed; heating the evenly mixed waste paper pulp to react, kneading it during the reaction, and washing it with water after the reaction to obtain modified waste paper pulp. The process of the present invention is simple, easy to operate, and convenient for industrial application. The swelling property of the modified waste paper pulp fiber is improved, and the strength of the paper made of the modified waste paper pulp is improved, which expands the application scenarios of waste paper pulp.
Description
Technical Field
The invention belongs to the field of waste paper pulp performance recovery, and particularly relates to a method for improving the performance of waste paper pulp with high lignin content.
Background
The disclosure of this background section is only intended to increase the understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.
With the increasing awareness of environmental protection and the growing shortage of plant resources, the recycling of waste paper is receiving more and more attention from pulp and paper enterprises. The waste paper has low price and wide sources, can effectively solve the shortage of paper making raw materials, and is beneficial to solving the environmental pollution in the pulping and papermaking process. However, with the increase of recycling times, after the fiber is subjected to processes of swelling, high-temperature drying, squeezing and the like for many times, the fiber is keratinized, so that the strength of the finished paper is reduced, and the recycling of waste paper is limited to a certain extent.
At present, the paper strength of the waste paper pulp is improved by means of mechanical pulping, chemical auxiliary agent addition, biological enzyme pretreatment and the like. In the existing pulping method, mechanical pulp occupies a larger share in the whole pulping industry by virtue of the advantages of simple process, low cost, high yield, small pollution and the like. However, this pulping process retains a substantial portion of the lignin in the raw material, which results in its tendency to yellow during subsequent use and lower mechanical strength of the finished paper, which greatly limits the recycling of this type of waste paper. Numerous researchers have found that after the waste paper pulp with higher lignin content is treated by laccase, the waste paper pulp is grafted and modified by amino acid, and the carboxyl content on the fiber surface of the waste paper pulp is obviously improved, so that the swelling property of the fiber is increased, the softness of the fiber is improved, the bonding energy of the fiber in a paper sheet is improved, and the paper strength of the waste paper pulp is improved. However, the above method requires treatment with biological enzymes, and the reaction conditions are relatively severe, so that large-scale application is difficult to realize.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide a method for improving the performance of waste paper pulp with high lignin content.
In order to achieve the above object, the present invention is realized by the following technical scheme:
In a first aspect, the present invention provides a method for improving pulp properties of high lignin content waste paper, comprising the steps of:
s1, placing waste paper pulp into a sealing bag, dropwise adding propyl acetoacetate into the waste paper pulp, and fully kneading to uniformly mix the waste paper pulp;
s2, adding sulfuric acid solution into the waste paper pulp which is uniformly mixed, and fully kneading to uniformly mix the waste paper pulp;
S3, heating the waste paper pulp which is uniformly mixed for reaction, kneading during the reaction, and washing with water after the reaction is finished to obtain modified waste paper pulp.
In a second aspect, the present invention provides a modified waste pulp obtained by the method for improving pulp properties of waste paper with high lignin content according to the first aspect.
In a third aspect, the present invention provides the use of the modified waste pulp of the second aspect in the formation of waste paper.
The beneficial effects obtained by one or more of the technical schemes of the invention are as follows:
(1) Compared with the enzyme treatment method, the method provided by the invention has the advantages of simple process, mild reaction conditions, easily obtained raw materials, easiness in operation and convenience in industrial application.
(2) The modified waste paper pulp obtained by the method for improving the performance of the waste paper pulp with high lignin content has the advantages of improving the swelling property of fibers in the modified waste paper pulp, improving the paper strength and expanding the application scene of the waste paper pulp.
Detailed Description
In a first exemplary embodiment of the present invention, a method for improving pulp properties of high lignin content waste paper comprises the steps of:
s1, placing waste paper pulp into a sealing bag, dropwise adding propyl acetoacetate into the waste paper pulp, and fully kneading to uniformly mix the waste paper pulp;
s2, adding sulfuric acid solution into the waste paper pulp which is uniformly mixed, and fully kneading to uniformly mix the waste paper pulp;
S3, heating the waste paper pulp which is uniformly mixed for reaction, kneading during the reaction, and washing with water after the reaction is finished to obtain modified waste paper pulp.
In one or more embodiments, the waste paper pulp includes mechanical pulp or chemimechanical pulp that is recycled, the mechanical pulp or chemimechanical pulp being derived from softwood, hardwood, and grass stock.
The main reason for causing yellowing and brittleness of the waste paper pulp with high lignin content is that the lignin is caused by phenolic hydroxyl groups and other groups, and the lignin can react with the phenolic hydroxyl groups by means of propyl acetoacetate and sulfuric acid, so that the yellowing is improved. In addition, the paper strength of the modified waste paper fiber is obviously improved
In one or more embodiments, the lignin content in the waste paper pulp is 10-15%.
In one or more examples of this embodiment, in step S1, the purity of propyl acetoacetate is 92-95%, the mass ratio of the waste paper pulp to propyl acetoacetate is 20-30:1, and the drop acceleration of propyl acetoacetate is 2-5mL/min.
In one or more examples of this embodiment, the mass ratio of sulfuric acid to propyl acetoacetate is from 1:5 to 8.
In one or more embodiments of this embodiment, in step S2, the kneading temperature is 1-4℃and the kneading time is 0.5-1.5h.
In one or more embodiments of this embodiment, the temperature is raised to 20-40 ℃ in step S3.
In one or more embodiments of this embodiment, the reaction time in step S3 is 4-5 hours and kneading is performed at intervals of 30-60 minutes.
In a second exemplary embodiment of the present invention, a modified waste pulp obtained by the method for improving the properties of waste paper pulp having a high lignin content according to the first exemplary embodiment.
In a third exemplary embodiment of the present invention, the modified waste pulp according to the second exemplary embodiment is used in waste paper forming.
In order to enable those skilled in the art to more clearly understand the technical scheme of the present invention, the technical scheme of the present invention will be described in detail below with reference to specific examples and comparative examples.
Example 1
And (3) placing the poplar chemical machine pulp waste paper (the lignin content is 12%) into a sealing bag, then dropwise adding propyl acetoacetate with the purity of 92% into the waste paper pulp, wherein the dropwise adding speed is 2mL/min, the mass ratio of the waste paper pulp to the propyl acetoacetate is 20:1, and fully kneading. Placing the waste paper pulp after uniform mixing at 1 ℃, adding sulfuric acid solution, fully kneading the waste paper pulp with the mass ratio of propyl acetoacetate to sulfuric acid being 5:1, after 0.5h, raising the temperature of the mixed system to 25 ℃, continuing to react for 4h, and kneading every 30min during the period. After the reaction, washing with water to obtain modified waste paper pulp.
And in the control group, the poplar wood machine pulp waste paper (the lignin content is 12%) is taken and placed in a sealing bag, deionized water is dripped into the waste paper pulp, the dripping speed is 2mL/min, the mass ratio of the waste paper pulp to the deionized water is 20:1, and the waste paper pulp and the deionized water are fully kneaded. Placing the waste paper pulp after uniform mixing at 1 ℃, adding deionized water, fully kneading to uniformly mix the waste paper pulp, after 0.5h, raising the temperature of a mixed system to 25 ℃, continuing to react for 4h, and kneading every 30 min. After the reaction, washing with water to obtain modified waste paper pulp.
The prepared modified waste paper pulp is formed into paper (the quantitative amount is 60g/m 2) by a rapid automatic forming sheet-making machine, and various physical strengths of the formed paper are measured. The test results are shown in Table 1.
TABLE 1 physical Strength contrast Effect of wastepaper pulp before and after modification
As can be seen from the data in Table 1, the tensile index of the modified waste paper pulp prepared by the method is improved from original 23.52 N.m.g -1 to 29.56 N.m.g -1, the burst index is improved from original 1.21 KPa.m 2·g-1 to 1.53 KPa.m 2·g-1, and the tearing index is improved from original 2.35 mN.m 2·g-1 to 2.87 mN.m 2·g-1.
Example 2
And (3) placing the wheat straw chemi-mechanical pulp waste paper (lignin content is 10%) into a sealing bag, then dropwise adding propyl acetoacetate with the purity of 95% into the waste paper pulp, wherein the dropwise adding speed is 5mL/min, the mass ratio of the waste paper pulp to the propyl acetoacetate is 25:1, and fully kneading. Placing the waste paper pulp after uniform mixing at 1 ℃, adding sulfuric acid solution, fully kneading the waste paper pulp with the mass ratio of propyl acetoacetate to sulfuric acid being 8:1, after 1h, raising the temperature of the mixed system to 40 ℃, continuing to react for 5h, and kneading every 45min during the period. After the reaction, washing with water to obtain modified waste paper pulp.
And (3) in the control group, replacing propyl acetoacetate and sulfuric acid with equal amounts of deionized water to obtain modified waste paper pulp serving as the control group.
The prepared modified waste paper pulp is formed into paper (the quantitative amount is 60g/m 2) by a rapid automatic forming sheet-making machine, and various physical strengths of the formed paper are measured. The test results are shown in Table 2.
TABLE 2 physical Strength contrast Effect of wastepaper pulp before and after modification
As can be seen from the data in Table 2, the method for preparing the modified waste paper pulp has the advantages that the breaking length is increased from original x 3.65Km to 3.98Km, the burst index is increased from original 2.26 KPa.m 2·g-1 to 2.93 KPa.m 2·g-1, the tearing index is increased from original 2.84 mN.m 2·g-1 to 3.01 mN.m 2·g-1, and the results prove that the method can effectively improve the paper strength of the waste paper pulp and improve the waste paper pulp performance.
Example 3
Placing eucalyptus hydroperoxide machine pulp waste paper (lignin content 15%) into a sealing bag, then dropwise adding propyl acetoacetate with purity of 95% into the waste paper pulp, wherein the dropwise adding speed is 2mL/min, the mass ratio of the waste paper pulp to the propyl acetoacetate is 20:1, and fully kneading. Placing the waste paper pulp after uniform mixing at 1 ℃, adding sulfuric acid solution, fully kneading the waste paper pulp with the mass ratio of propyl acetoacetate to sulfuric acid being 5:1, after 0.5h, raising the temperature of the mixed system to 25 ℃, continuing to react for 4h, and kneading every 30min during the period. After the reaction, washing with water to obtain modified waste paper pulp.
And (3) in the control group, replacing propyl acetoacetate and sulfuric acid with equal amounts of deionized water to obtain modified waste paper pulp serving as the control group.
The prepared modified waste paper pulp is formed into paper (the quantitative amount is 60g/m 2) by a rapid automatic forming sheet-making machine, and various physical strengths of the formed paper are measured. The test results are shown in Table 3.
TABLE 3 physical Strength contrast Effect of wastepaper pulp before and after modification
As can be seen from the data in Table 3, the tensile index of the modified waste paper pulp prepared by the method is improved to 2.92Km from original 2.75Km, the burst index is improved to 2.07 KPa.m 2·g-1 from original 1.89 KPa.m 2·g-1, and the tearing index is improved to 2.38 mN.m 2·g-1 from original 2.16 mN.m 2·g-1.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A method for improving pulp properties of high lignin content waste paper, comprising the steps of:
s1, placing waste paper pulp into a sealing bag, dropwise adding propyl acetoacetate into the waste paper pulp, and fully kneading to uniformly mix the waste paper pulp;
s2, adding sulfuric acid solution into the waste paper pulp which is uniformly mixed, and fully kneading to uniformly mix the waste paper pulp;
S3, heating the waste paper pulp which is uniformly mixed for reaction, kneading during the reaction, and washing with water after the reaction is finished to obtain modified waste paper pulp;
in the step S1, the mass ratio of the waste paper pulp to the propyl acetoacetate is 20-30:1, and the dripping speed of the propyl acetoacetate is 2-5 mL/min;
the mass ratio of the sulfuric acid to the propyl acetoacetate is 1:5-8;
in the step S2, the kneading temperature is 1-4 ℃, and the kneading time is 0.5-1.5 h;
In the step S3, the temperature is raised to 20-40 ℃;
In the step S3, the reaction time is 4-5 h, and kneading is carried out at intervals of 30-60 min;
the lignin content in the waste paper pulp is 10-15%.
2. The method of claim 1, wherein the waste paper pulp comprises mechanical pulp or chemimechanical pulp which is recycled, and is derived from needle wood, hardwood and grass stock.
3. The method for improving pulp properties of waste paper having a high lignin content according to claim 1 wherein the purity of propyl acetoacetate in step S1 is 92 to 95%.
4. A modified waste pulp obtained by the method for improving the properties of a waste paper pulp having a high lignin content as claimed in any one of claims 1 to 3.
5. The use of the modified waste paper pulp of claim 4 in waste paper forming.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105392793A (en) * | 2013-07-15 | 2016-03-09 | 荷兰能源建设基金中心 | Improved process for the organosolv treatment of lignocellulosic biomass |
| CN107614784A (en) * | 2015-06-23 | 2018-01-19 | 松本油脂制药株式会社 | Reinforcing fiber sizing agent and application thereof |
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| EP2956465B1 (en) * | 2013-02-15 | 2024-10-16 | Nederlandse Organisatie voor toegepast- natuurwetenschappelijk Onderzoek TNO | Process for the treatment of lignocellulosic biomass |
| FR3044577B1 (en) * | 2015-12-07 | 2017-12-22 | Timothee Boitouzet | METHOD FOR PARTIAL DELIGNIFICATION AND FILLING OF A LIGNOCELLULOSIC MATERIAL, AND STRUCTURE OF COMPOSITE MATERIAL OBTAINED BY THIS PROCESS |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105392793A (en) * | 2013-07-15 | 2016-03-09 | 荷兰能源建设基金中心 | Improved process for the organosolv treatment of lignocellulosic biomass |
| CN107614784A (en) * | 2015-06-23 | 2018-01-19 | 松本油脂制药株式会社 | Reinforcing fiber sizing agent and application thereof |
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