CN119192609A - Modified bamboo-based fiber, bamboo fiber packaging paper and preparation method thereof - Google Patents
Modified bamboo-based fiber, bamboo fiber packaging paper and preparation method thereof Download PDFInfo
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- CN119192609A CN119192609A CN202411472994.7A CN202411472994A CN119192609A CN 119192609 A CN119192609 A CN 119192609A CN 202411472994 A CN202411472994 A CN 202411472994A CN 119192609 A CN119192609 A CN 119192609A
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- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 329
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- 239000000654 additive Substances 0.000 claims description 4
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 230000000996 additive effect Effects 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 claims description 3
- FSQQTNAZHBEJLS-UPHRSURJSA-N maleamic acid Chemical compound NC(=O)\C=C/C(O)=O FSQQTNAZHBEJLS-UPHRSURJSA-N 0.000 claims description 3
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- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 2
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- 239000000463 material Substances 0.000 abstract description 13
- 239000000126 substance Substances 0.000 abstract description 5
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- 239000012043 crude product Substances 0.000 description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 17
- 238000002156 mixing Methods 0.000 description 15
- 230000000052 comparative effect Effects 0.000 description 14
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 12
- 238000004537 pulping Methods 0.000 description 12
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 11
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- 239000004033 plastic Substances 0.000 description 5
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- RYHBNJHYFVUHQT-UHFFFAOYSA-N 1,4-Dioxane Chemical compound C1COCCO1 RYHBNJHYFVUHQT-UHFFFAOYSA-N 0.000 description 4
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- FHDQNOXQSTVAIC-UHFFFAOYSA-M 1-butyl-3-methylimidazol-3-ium;chloride Chemical compound [Cl-].CCCCN1C=C[N+](C)=C1 FHDQNOXQSTVAIC-UHFFFAOYSA-M 0.000 description 2
- ZXLOSLWIGFGPIU-UHFFFAOYSA-N 1-ethyl-3-methyl-1,2-dihydroimidazol-1-ium;acetate Chemical compound CC(O)=O.CCN1CN(C)C=C1 ZXLOSLWIGFGPIU-UHFFFAOYSA-N 0.000 description 2
- NJMWOUFKYKNWDW-UHFFFAOYSA-N 1-ethyl-3-methylimidazolium Chemical compound CCN1C=C[N+](C)=C1 NJMWOUFKYKNWDW-UHFFFAOYSA-N 0.000 description 2
- 108010005094 Advanced Glycation End Products Proteins 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
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- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
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- 239000002994 raw material Substances 0.000 description 2
- 238000007086 side reaction Methods 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- 206010067484 Adverse reaction Diseases 0.000 description 1
- 244000271437 Bambusa arundinacea Species 0.000 description 1
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Classifications
-
- 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
- C08H8/00—Macromolecular compounds derived from lignocellulosic materials
-
- 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
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
-
- 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
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
-
- 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
- D21H21/18—Reinforcing agents
- D21H21/20—Wet strength 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
- 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
- D21H21/22—Agents rendering paper porous, absorbent or bulky
- D21H21/24—Surfactants
-
- 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
- D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
-
- 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
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biochemistry (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Pest Control & Pesticides (AREA)
- Engineering & Computer Science (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
本发明涉及生物基材料领域，尤其涉及改性竹基纤维、竹纤维包装纸及其制备方法，所述方法包括以下步骤：（S.1）除去竹子中的可溶性有机质及木质素，得到仅包含有纤维素以及半纤维素的竹纤维；（S.2）将竹纤维置于氧化性环境条件下，使得竹纤维中的至少一部分羟基转变为羰基；（S.3）将经过氧化过后竹纤维与包含有氨基的化合物进行美拉德反应，得到改性竹纤维。本申请通过对竹子中的竹纤维进行提纯以及改性，从而有效提升了竹纤维的力学性能以及化学性能，从而扩宽了该纤维的应用场景。通过该改性的竹基纤维制备得到的竹纤维包装纸使得其具有更好的耐用性和可靠性。
The present invention relates to the field of bio-based materials, and in particular to modified bamboo-based fibers, bamboo fiber packaging paper, and a preparation method thereof, the method comprising the following steps: (S.1) removing soluble organic matter and lignin from bamboo to obtain bamboo fibers containing only cellulose and hemicellulose; (S.2) placing the bamboo fibers under oxidative conditions to convert at least a portion of the hydroxyl groups in the bamboo fibers into carbonyl groups; (S.3) subjecting the oxidized bamboo fibers to a Maillard reaction with a compound containing an amino group to obtain modified bamboo fibers. The present application purifies and modifies the bamboo fibers in bamboo, thereby effectively improving the mechanical and chemical properties of the bamboo fibers, thereby broadening the application scenarios of the fibers. The bamboo fiber packaging paper prepared by the modified bamboo-based fibers has better durability and reliability.
Description
Technical Field
The invention relates to the field of biological base materials, in particular to modified bamboo base fibers, bamboo fiber packaging paper and a preparation method thereof.
Background
With the increasing importance of global environmental protection, the "bamboo is used as an important development trend. Meanwhile, the production of plastics mainly depends on non-renewable resources such as petroleum, and with the gradual exhaustion of the resources, the search for sustainable alternative materials becomes vital.
The bamboo plastic product is made from bamboo as raw material, and is prepared by physical and/or chemical processing methods according to standard processing flow with or without auxiliary materials such as stress materials including adhesives, and is applied in the packaging field to replace natural biomass materials of plastic products. The application of bamboo products instead of plastic products in the packaging field can be regarded as packaging produced by processing bamboo materials with different physical properties through modern bamboo industry and by using scene matching in a proper processing mode.
Bamboo as one kind of renewable resource has the advantages of fast growth speed, wide distribution, rich resource, etc. The bamboo fiber has good mechanical property, hygroscopicity and air permeability, is relatively easy to degrade in natural environment, and is environment-friendly. In recent years, research and application of bamboo fiber are in progress, but the bamboo fiber products on the market still have some defects.
For example, the performance of common bamboo fibers is to be further improved to meet the higher requirements of different fields on packaging materials. In the field of packaging paper, the existing bamboo fiber packaging paper may have the problems of insufficient strength, poor moisture resistance, poor printability and the like. In order to overcome the defects, the bamboo-based fiber needs to be modified to improve the performance of the bamboo fiber packaging paper, so that the bamboo-based fiber packaging paper can better replace the application of plastic products in the packaging field.
Disclosure of Invention
The invention provides a modified bamboo-based fiber, a bamboo fiber packaging paper and a preparation method thereof, which aim to solve the problems of poor strength performance and poor moisture resistance of the bamboo-based fiber in the prior art.
In order to achieve the aim of the invention, the invention is realized by the following technical scheme:
in a first aspect, the present invention provides a method for modifying the surface of bamboo-based fiber, comprising the steps of:
(S.1) removing soluble organic matters and lignin in bamboo to obtain bamboo fiber only containing cellulose and hemicellulose;
(s.2) subjecting the bamboo fibers to oxidative environmental conditions such that at least a portion of the hydroxyl groups in the bamboo fibers are converted to carbonyl groups;
(S.3) carrying out Maillard reaction on the oxidized bamboo fiber and a compound containing amino groups to obtain the modified bamboo fiber.
The bamboo raw material generally contains cellulose, hemicellulose and lignin and a small amount of soluble micromolecular organic matters, wherein the cellulose and the hemicellulose generally have linear structures, the lignin is in a three-dimensional network structure, and the lignin and components such as cellulose are tightly crosslinked in the bamboo to form a complex three-dimensional network structure. Due to the difference in the structures of cellulose, hemicellulose and lignin, lignin has higher hardness than cellulose and hemicellulose, but has poorer flexibility. When the lignin content in the components of the packaging material is too high, the too high hardness is detrimental to the manufacture and use of the packaging material. Therefore, in the first step of the application, the soluble organic matters and lignin in the bamboo are removed, so that the bamboo fiber with excellent flexibility and strength and containing only cellulose and hemicellulose is obtained, and after the impurities are removed, the bamboo fiber can have a more regular structure, and is beneficial to improving the mechanical properties such as strength, toughness and the like, so that the finally obtained modified bamboo fiber and bamboo fiber packaging paper have better durability and reliability.
In addition, the Maillard reaction is selected to be used for modifying the bamboo fiber in the process of modifying the bamboo fiber, and the reason is that:
First, compared with other surface modification methods, the Maillard reaction can lead the surface of the bamboo fiber to introduce functional groups containing hetero atoms such as nitrogen, oxygen and the like. For example, the reaction can generate nitrogen-containing heterocyclic compounds and the like, and the new functional groups can change the surface chemical properties of the bamboo fibers, increase the reactive sites of the bamboo fibers, improve the interaction capability of the bamboo fibers and other substances, such as the interfacial binding force with a matrix such as resin and the like, and are very important for preparing high-performance bamboo fiber composite materials.
In addition, the hydrophilicity or the hydrophobicity of the surface of the bamboo fiber can be regulated by controlling the Maillard reaction conditions. For example, after reacting under certain conditions, the polarity of the bamboo fiber surface may change, making it more suitable for use in specific application environments, such as in situations where good water dispersibility or incorporation of hydrophobic materials is desired.
Thirdly, a layer of 'shell' may be formed on the surface of the bamboo fiber by the polymer or the cross-linked structure generated by the Maillard reaction, so that the rigidity and the hardness of the fiber are increased, and the fiber is not easy to deform or break when bearing external force. The Maillard reaction products also have certain oxidation resistance, so that the oxidation resistance of the bamboo fiber can be improved, and the service life of the bamboo fiber can be prolonged. The bamboo fiber modified by Maillard reaction has better application prospect in the fields with requirements on oxidation resistance of materials, such as biomedical materials, packaging materials and the like.
Finally, the maillard reaction is typically carried out under relatively mild conditions, as compared to some complex chemical modification processes, without the use of overly harsh reaction conditions, such as high temperatures, high pressures, highly corrosive reagents, and the like. This makes the reaction process easy to control, and the requirement on equipment is lower, also is favorable to reducing manufacturing cost and operational risk. The reaction can be carried out in a water phase or organic phase system, the treatment mode of the bamboo fiber is flexible, and the method can adapt to different production processes and application requirements.
Although the maillard reaction has the above advantageous effects, the number of groups (mainly carbonyl groups) capable of participating in the maillard reaction in cellulose and hemicellulose is small and is substantially at the end of a molecular chain, so that it is difficult to raise the maillard reaction degree without modifying cellulose and hemicellulose. Therefore, the selective oxidation is carried out on the bamboo fiber in the step (S.2) in a targeted manner, so that at least part of hydroxyl groups in the bamboo fiber are converted into carbonyl groups, the reaction sites of Maillard reaction in the bamboo fiber are greatly increased, and the Maillard reaction degree is improved.
Preferably, the step (s.1) specifically includes the following steps:
-splitting bamboo into strips and crushing, followed by extraction to remove soluble organic matter from the strips, to obtain a bamboo fibre intermediate;
-placing the bamboo fiber intermediate with the soluble organic matters removed in a solvent capable of dissolving lignin, so as to dissolve lignin in bamboo, and then separating and washing the bamboo fiber intermediate with water to obtain a bamboo fiber crude product;
-mechanically extruding the bamboo fibres so that the bamboo fibres are separated from each other and dried to obtain the desired bamboo fibres.
The presence of lignin affects the properties of the bamboo fibers and subsequent modification reactions. Therefore, the bamboo fiber intermediate with the soluble organic matters removed is placed in the solvent capable of dissolving lignin, so that lignin in bamboo can be effectively dissolved. The removal of lignin can improve the purity of the bamboo fiber, so that the bamboo fiber is more suitable for surface modification. The lignin has a complex structure, and can prevent the contact between the modifying reagent and the bamboo fiber, thereby affecting the modifying effect. After lignin is removed, the surface of the bamboo fiber is more exposed, which is beneficial to subsequent modification treatment.
Preferably, the solvent capable of dissolving lignin comprises one or more of hydrochloric acid, acetic acid, dioxane and an ionic liquid, wherein the ionic liquid can be selected from 1-butyl-3-methylimidazole chloride ([ Bmim ] Cl) and 1-ethyl-3-methylimidazole acetate ([ Emim ] Ac). Wherein, the ionic liquid of 1-butyl-3-methylimidazole chloride ([ Bmim ] Cl) can effectively dissolve lignin. The lignin molecules are dispersed in the ionic liquid through hydrogen bond and ion interaction with hydroxyl, carbonyl and other functional groups in the lignin molecules. And the 1-ethyl-3-methylimidazole acetate ([ Emim ] Ac) also has a good dissolution effect on lignin. The designability of ionic liquids allows the dissolution properties of lignin to be optimized by adjusting the structure of the cations and anions.
In addition, under hydrothermal conditions of high temperature and high pressure, water can be used as a solvent to dissolve lignin. The hydrothermal reaction can disrupt the structure of lignin, causing it to break down into smaller molecular fragments, which dissolve in water. This method is relatively environmentally friendly, does not require the use of organic solvents, but requires higher temperature and pressure conditions.
Preferably, the step (s.2) specifically includes the following steps:
and (3) placing the bamboo fibers under an oxidizing environment condition, and heating the bamboo fibers to 80-120 ℃ for 0.5-5h.
Preferably, the oxidizing environment comprises one or more of an air environment, an oxygen environment, an ozone environment, a hydrogen peroxide environment, and a potassium permanganate environment.
Preferably, in the step (S.3), the Maillard reaction temperature is 50-130 ℃ and the Maillard reaction time is 0.5-48 h.
The inventors have found that different temperatures affect the product composition and properties of the maillard reaction. At lower temperatures, the reaction may produce mainly some primary maillard reaction products, such as aldehydes, ketones, and the like. As the temperature increases, the reaction proceeds further, producing more complex products such as melanoids and the like. By controlling the reaction temperature, the properties of the product can be adjusted to meet different application requirements. The excessive temperature may cause adverse reactions such as degradation of bamboo fiber, increase of side reactions, etc. Therefore, the temperature is controlled within the range of 50-130 ℃, and adverse effects on the bamboo fibers can be reduced as much as possible while promoting Maillard reaction.
In addition, the Maillard reaction is generally a relatively slow process that takes some time to proceed adequately. The reaction time is set to be 0.5-48h, so that the carbonyl in the bamboo fiber and the compound containing amino groups can be ensured to have enough time for reaction, and the conversion rate of the reaction and the quality of products are improved. Shorter reaction times may result in incomplete reactions, while excessively long reaction times may waste energy and time, and may increase the incidence of side reactions.
Preferably, the amino group-containing compound includes one or more of acrylamide, vinylglycine, and maleamic acid.
In the Maillard reaction, the amino group of the compound containing the amino group can undergo nucleophilic addition reaction with carbonyl groups in the bamboo fiber to form stable chemical bonds. In addition, the acrylamide, the vinyl glycine and the maleamic acid also contain unsaturated double bonds, so that the unsaturated double bonds can be introduced into the bamboo fiber in the Maillard reaction process, and the subsequent application is expanded.
In a second aspect, the present invention provides a modified bamboo-based fiber prepared by the method of any one of the above.
In a third aspect, the invention also provides a bamboo fibre wrapper comprising modified bamboo-based fibres as described above.
In a fourth aspect, the present invention also provides a method for preparing the bamboo fiber packaging paper, comprising the steps of:
(S.1) pulping the modified bamboo-based fiber prepared by the method to obtain bamboo-based fiber slurry;
(S.2) adding filler and additive into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(S.3) sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
And (S.4) coating latex on the surface of the paper semi-finished product, and then drying and curing the paper semi-finished product to obtain the bamboo fiber packaging paper.
Preferably, in the step (S.1), the beating degree is 40-55 DEG SR, and the slurry concentration in the bamboo-based fiber slurry is 1-2%.
Preferably, the filler in the step (S.2) is any one of silicon dioxide and calcium carbonate, and the additive is any one or a combination of a plurality of surfactants, wet strength agents and antibacterial agents.
Preferably, the latex in the step (S.4) is applied in an amount of 1 to 5g/m 2.
Therefore, the invention has the following beneficial effects:
according to the application, the bamboo fibers in the bamboo are purified and modified, so that the mechanical property and chemical property of the bamboo fibers are effectively improved, and the application scene of the fibers is widened. The bamboo fiber packaging paper prepared by the modified bamboo-based fiber has better durability and reliability.
Drawings
Fig. 1 is an electron micrograph of a bamboo fiber wrapper prepared in example 1 of the present invention.
Detailed Description
The invention is further described below in connection with specific embodiments. Those of ordinary skill in the art will be able to implement the invention based on these descriptions. In addition, the embodiments of the present invention referred to in the following description are typically only some, but not all, embodiments of the present invention. Therefore, all other embodiments, which can be made by one of ordinary skill in the art without undue burden, are intended to be within the scope of the present invention, based on the embodiments of the present invention.
[ Bamboo-based fiber surface modification method ]
The preparation method of the modified bamboo-based fiber 1 comprises the following steps:
(S.1) dividing and cutting bamboo into strips and crushing to obtain bamboo chips with the length of 1-5mm, boiling the bamboo chips with water for 2 hours to remove soluble organic matters, mixing the bamboo chips, acetic acid and concentrated hydrochloric acid according to the weight percentage of 100:500:10, reacting for 10 hours at 80 ℃, filtering to obtain filter residues, washing the filter residues to obtain bamboo fiber crude products, mechanically extruding the bamboo fiber crude products to separate the bamboo fibers from each other, and drying to obtain bamboo fibers only containing cellulose and hemicellulose;
Removing soluble organic matters and lignin in bamboo to obtain bamboo fiber containing cellulose and hemicellulose only;
(s.2) exposing the bamboo fibers to air ambient conditions, heating to 120 ℃ for 5 hours, such that at least a portion of the hydroxyl groups in the bamboo fibers are converted to carbonyl groups;
(S.3) mixing the oxidized bamboo fiber with 2% concentration acrylamide aqueous solution according to the weight ratio of 100:10, heating to 80 ℃ and performing Maillard reaction for 24 hours to obtain the modified bamboo fiber 1.
The preparation method of the modified bamboo-based fiber 2 comprises the following steps:
(S.1) dividing and cutting bamboo into strips and crushing to obtain bamboo chips with the length of 1-5mm, boiling the bamboo chips with water for 2 hours to remove soluble organic matters, mixing the bamboo chips, acetic acid and concentrated hydrochloric acid according to the weight percentage of 100:500:10, reacting for 10 hours at 80 ℃, filtering to obtain filter residues, washing the filter residues to obtain bamboo fiber crude products, mechanically extruding the bamboo fiber crude products to separate the bamboo fibers from each other, and drying to obtain bamboo fibers only containing cellulose and hemicellulose;
Removing soluble organic matters and lignin in bamboo to obtain bamboo fiber containing cellulose and hemicellulose only;
(s.2) placing the bamboo fiber under an air environment condition containing 5% ozone, heating to 100 ℃ for 0.5h, so that at least part of hydroxyl groups in the bamboo fiber are converted into carbonyl groups;
(S.3) mixing the oxidized bamboo fiber with 2% concentration acrylamide aqueous solution according to the weight ratio of 100:20, heating to 50 ℃ and carrying out Maillard reaction for 48 hours to obtain the modified bamboo fiber 2.
The preparation method of the modified bamboo-based fiber 3 comprises the following steps:
(S.1) dividing and cutting bamboo into strips and crushing to obtain bamboo chips with the length of 1-5mm, boiling the bamboo chips with water for 2 hours to remove soluble organic matters, mixing the bamboo chips, acetic acid and concentrated hydrochloric acid according to the weight percentage of 100:500:10, reacting for 10 hours at 80 ℃, filtering to obtain filter residues, washing the filter residues to obtain bamboo fiber crude products, mechanically extruding the bamboo fiber crude products to separate the bamboo fibers from each other, and drying to obtain bamboo fibers only containing cellulose and hemicellulose;
Removing soluble organic matters and lignin in bamboo to obtain bamboo fiber containing cellulose and hemicellulose only;
(s.2) placing the bamboo fibers in a 2% hydrogen peroxide solution, and heating to 80 ℃ for 0.5h, so that at least a part of hydroxyl groups in the bamboo fibers are converted into carbonyl groups;
(S.3) mixing the oxidized bamboo fiber with 2% concentration acrylamide aqueous solution according to the weight ratio of 100:30, heating to 130 ℃, and performing Maillard reaction for 0.5h to obtain the modified bamboo fiber 3.
The preparation method of the modified bamboo-based fiber 4 comprises the following steps:
(S.1) dividing and cutting bamboo into strips and crushing to obtain bamboo chips with the length of 1-5mm, boiling the bamboo chips with water for 2 hours to remove soluble organic matters, mixing the bamboo chips with dioxane according to the weight percentage of 100:500, reacting for 12 hours at 80 ℃, filtering to obtain filter residues, washing the filter residues to obtain a bamboo fiber crude product, mechanically extruding the bamboo fiber crude product to separate the bamboo fibers from each other, and drying to obtain the bamboo fiber only containing cellulose and hemicellulose;
(s.2) exposing the bamboo fibers to air ambient conditions, heating to 115 ℃ for 3 such that at least a portion of the hydroxyl groups in the bamboo fibers are converted to carbonyl groups;
(S.3) mixing the oxidized bamboo fiber with 2% concentration vinyl glycine aqueous solution according to the weight ratio of 100:20, heating to 80 ℃ and performing Maillard reaction for 24 hours to obtain the modified bamboo fiber 4.
The preparation method of the modified bamboo-based fiber 5 comprises the following steps:
(S.1) dividing and cutting bamboo into strips and crushing to obtain bamboo chips with the length of 1-5mm, boiling the bamboo chips with water for 2 hours to remove soluble organic matters, mixing the bamboo chips with dioxane according to the weight percentage of 100:500, reacting for 12 hours at 80 ℃, filtering to obtain filter residues, washing the filter residues to obtain a bamboo fiber crude product, mechanically extruding the bamboo fiber crude product to separate the bamboo fibers from each other, and drying to obtain the bamboo fiber only containing cellulose and hemicellulose;
(s.2) exposing the bamboo fibers to air ambient conditions, heating to 115 ℃ for 3 such that at least a portion of the hydroxyl groups in the bamboo fibers are converted to carbonyl groups;
(S.3) mixing the oxidized bamboo fiber with 2% concentration maleic acid aqueous solution according to the weight ratio of 100:20, heating to 85 ℃ and performing Maillard reaction for 28 hours to obtain the modified bamboo fiber 5.
The preparation method of the comparative bamboo-based fiber 1 comprises the following steps:
(S.1) dividing and cutting bamboo into strips and crushing to obtain bamboo chips with the length of 1-5mm, boiling the bamboo chips with water for 2 hours to remove soluble organic matters, mixing the bamboo chips with dioxane according to the weight percentage of 100:500, reacting for 12 hours at 80 ℃, filtering to obtain filter residues, washing the filter residues to obtain a bamboo fiber crude product, mechanically extruding the bamboo fiber crude product to separate the bamboo fibers from each other, and drying to obtain the bamboo fiber only containing cellulose and hemicellulose;
(S.2) mixing the bamboo fiber with 2% concentration maleic acid aqueous solution according to the weight ratio of 100:20, heating to 85 ℃, and performing Maillard reaction for 28 hours to obtain the comparative bamboo-based fiber 1.
The preparation method of the comparative bamboo-based fiber 2 comprises the following steps:
(S.1) dividing and cutting bamboo into strips and crushing to obtain bamboo chips with the length of 1-5mm, boiling the bamboo chips with water for 2 hours to remove soluble organic matters, mixing the bamboo chips, acetic acid and concentrated hydrochloric acid according to the weight percentage of 100:500:10, reacting for 10 hours at 80 ℃, filtering to obtain filter residues, washing the filter residues to obtain bamboo fiber crude products, mechanically extruding the bamboo fiber crude products to separate the bamboo fibers from each other, and drying to obtain bamboo fibers only containing cellulose and hemicellulose;
Removing soluble organic matters and lignin in bamboo to obtain bamboo fiber containing cellulose and hemicellulose only;
(s.2) exposing the bamboo fibers to air ambient conditions, heating to 120 ℃ for 5 hours, such that at least a portion of the hydroxyl groups in the bamboo fibers are converted to carbonyl groups;
(S.3) mixing the oxidized bamboo fiber with 2% concentration acrylamide aqueous solution according to the weight ratio of 100:10, heating to 80 ℃ and carrying out Maillard reaction for 24 hours to obtain the comparative bamboo-based fiber 2.
The preparation method of the modified bamboo-based fiber 3 comprises the following steps:
Cutting bamboo into strips and crushing to obtain bamboo chips with the length of 1-5mm, boiling the bamboo chips with water for 2 hours to remove soluble organic matters, mixing the bamboo chips, acetic acid and concentrated hydrochloric acid according to the weight percentage of 100:500:10, reacting for 10 hours at 80 ℃, filtering to obtain filter residues, cleaning the filter residues to obtain bamboo fiber crude products, mechanically extruding the bamboo fiber crude products to separate the bamboo fibers from each other, and drying to obtain the modified bamboo-based fiber 3 only containing cellulose and hemicellulose.
Example 1
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the modified bamboo fiber 1 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 45 DEG SR;
(2) Adding 1% silicon dioxide filler, 0.05% sodium dodecyl benzene sulfonate and 0.8% wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 3g/m 2, and then curing the paper semi-finished product to be dried at 85 ℃ for 5 hours to obtain the bamboo fiber packaging paper.
Example 2
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the modified bamboo fiber 2 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 45 DEG SR;
(2) Adding 1% silicon dioxide filler, 0.05% sodium dodecyl benzene sulfonate and 0.8% wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 3g/m 2, and then curing the paper semi-finished product to be dried at 85 ℃ for 5 hours to obtain the bamboo fiber packaging paper.
Example 3
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the modified bamboo fiber 3 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 45 DEG SR;
(2) Adding 1% silicon dioxide filler, 0.05% sodium dodecyl benzene sulfonate and 0.8% wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 3g/m 2, and then curing the paper semi-finished product to be dried at 85 ℃ for 5 hours to obtain the bamboo fiber packaging paper.
Example 4
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing modified bamboo fiber 4 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 45 DEG SR;
(2) Adding 1% silicon dioxide filler, 0.05% sodium dodecyl benzene sulfonate and 0.8% wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 3g/m 2, and then curing the paper semi-finished product to be dried at 85 ℃ for 5 hours to obtain the bamboo fiber packaging paper.
Example 5
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the modified bamboo fiber 5 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 45 DEG SR;
(2) Adding 1% silicon dioxide filler, 0.05% sodium dodecyl benzene sulfonate and 0.8% wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 3g/m 2, and then curing the paper semi-finished product to be dried at 85 ℃ for 5 hours to obtain the bamboo fiber packaging paper.
Example 6
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the modified bamboo fiber 1 into slurry with the concentration of 2%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 55 DEG SR;
(2) Adding 1.5% of silicon dioxide filler, 0.1% of sodium dodecyl benzene sulfonate and 0.8% of wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 5g/m 2, and then curing the paper semi-finished product to be at 85 ℃ and drying for 8 hours to obtain the bamboo fiber packaging paper.
Example 7
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the modified bamboo fiber 1 into slurry with the concentration of 1%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 40 DEG SR;
(2) Adding 2% of silicon dioxide filler, 0.1% of sodium dodecyl benzene sulfonate and 0.8% of wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 1g/m 2, and then curing the paper semi-finished product to be at 85 ℃ and drying for 5 hours to obtain the bamboo fiber packaging paper.
Example 8
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the modified bamboo fiber 1 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 50 DEG SR;
(2) Adding 1.5% of silicon dioxide filler, 0.2% of sodium dodecyl benzene sulfonate and 0.5% of wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 2g/m 2, and then ultraviolet curing the paper semi-finished product for 30s to obtain the bamboo fiber packaging paper.
Comparative example 1
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the comparative bamboo-based fiber 1 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 45 DEG SR;
(2) Adding 1% silicon dioxide filler, 0.05% sodium dodecyl benzene sulfonate and 0.8% wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 3g/m 2, and then curing the paper semi-finished product to be dried at 85 ℃ for 5 hours to obtain the bamboo fiber packaging paper.
Comparative example 2
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the comparative bamboo-based fiber 2 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 45 DEG SR;
(2) Adding 1% silicon dioxide filler, 0.05% sodium dodecyl benzene sulfonate and 0.8% wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 3g/m 2, and then curing the paper semi-finished product to be dried at 85 ℃ for 5 hours to obtain the bamboo fiber packaging paper.
Comparative example 3
The preparation method of the bamboo fiber packaging paper comprises the following steps:
(1) Preparing the comparative bamboo-based fiber 3 into slurry with the concentration of 1.5%, and pulping to obtain bamboo-based fiber slurry with the beating degree of 45 DEG SR;
(2) Adding 1% silicon dioxide filler, 0.05% sodium dodecyl benzene sulfonate and 0.8% wet strength agent into the bamboo-based fiber slurry to obtain composite bamboo-based fiber slurry;
(3) Sequentially carrying out papermaking forming, dehydration and drying treatment on the composite bamboo-based fiber slurry to obtain a paper semi-finished product;
(4) And (3) coating latex on the surface of the paper semi-finished product, wherein the latex contains 0.01% of initiator, the coating amount of the latex is 3g/m 2, and then curing the paper semi-finished product to be dried at 85 ℃ for 5 hours to obtain the bamboo fiber packaging paper.
The bamboo fiber wrapping papers prepared in examples 1 to 8 and comparative examples 1 to 3 were tested for tensile strength, tear strength, oxygen permeability, and water vapor permeability.
Wherein the tensile strength and the tearing strength are tested according to GB/T453-2002;
Oxygen transmission was tested according to GB/T19789-2005;
The water vapor transmission rate was measured in accordance with GB/T22921-2008, and the measurement results are shown in Table 1 below.
TABLE 1
| Project | Tensile Strength (kN/m) | Tear strength (mN) | Oxygen transmittance (cm 3/cm2) | Water vapor Transmission rate (g/cm 2 day) |
| Example 1 | 2.82 | 625.5 | 548 | 162 |
| Example 2 | 2.91 | 633.4 | 541 | 158 |
| Example 3 | 3.02 | 639.1 | 537 | 155 |
| Example 4 | 2.86 | 628.6 | 550 | 161 |
| Example 5 | 2.95 | 638.2 | 536 | 156 |
| Example 6 | 2.93 | 631.5 | 538 | 152 |
| Example 7 | 2.65 | 618.9 | 556 | 173 |
| Example 8 | 2.90 | 628.3 | 536 | 149 |
| Comparative example 1 | 2.36 | 593.9 | 596.1 | 192 |
| Comparative example 2 | 2.44 | 615.8 | 581 | 178 |
| Comparative example 3 | 2.09 | 563.5 | 621.5 | 208 |
From the data in the table, the mechanical properties of the bamboo fiber packaging paper can be effectively improved by adding the modified bamboo fibers in the application into the bamboo fiber packaging paper. Meanwhile, the barrier property of the material to oxygen and water vapor can be effectively improved, so that the material can be effectively applied to the field of packaging, and the application range of the material is enlarged.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions, without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (10)
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