CN112878110A - Method for preparing cushioning packaging material by using bamboo fibers - Google Patents

Method for preparing cushioning packaging material by using bamboo fibers Download PDF

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Publication number
CN112878110A
CN112878110A CN202011211101.5A CN202011211101A CN112878110A CN 112878110 A CN112878110 A CN 112878110A CN 202011211101 A CN202011211101 A CN 202011211101A CN 112878110 A CN112878110 A CN 112878110A
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China
Prior art keywords
bamboo
packaging material
preparing
pulp
foaming
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CN202011211101.5A
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Chinese (zh)
Inventor
刘洁
王安睿
张振镇
林广生
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Jiangxi Zhongzhu Biomass Technology Co ltd
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Jiangxi Zhongzhu Biomass Technology Co ltd
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Priority to CN202011211101.5A priority Critical patent/CN112878110A/en
Publication of CN112878110A publication Critical patent/CN112878110A/en
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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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • D21H17/29—Starch cationic
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
    • 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
    • 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
    • D21H17/66—Salts, e.g. alums
    • 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
    • D21H17/71—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
    • 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
    • D21H21/34—Ignifugeants
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/06—Drying

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Buffer Packaging (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

The invention provides a method for preparing a cushioning packaging material by using bamboo fibers, and relates to the technical field of preparation of cushioning packaging materials. The method for preparing the buffering packaging material by using the bamboo fiber comprises the following steps: uniformly mixing the composite adhesive, the foaming agent, the plasticizer, the bamboo pulp, AKD, the curing agent and the gelling agent, and foaming at the temperature of 150 ℃ and 180 ℃ for 15-30min to obtain foaming slurry; and drying the foaming slurry at 75-85 ℃ for 10-12h, fixing and forming to obtain the buffering packaging material. The invention has the advantages that the bamboo pulp is fully foamed through the foaming agent and the like with specific proportion, and the finally obtained cushion packaging material has good apparent density, pressure resistance and certain pressure relief space.

Description

Method for preparing cushioning packaging material by using bamboo fibers
Technical Field
The invention relates to the technical field of preparation of a cushioning packaging material, and particularly relates to a method for preparing the cushioning packaging material by using bamboo fibers.
Background
With the continuous development of economy, China advocates forbidding and limiting the production, sale and use of part of plastic products, actively popularizes substitute products, standardizes the recycling of plastic wastes, and establishes a management system for the production, circulation, use, recovery, disposal and other links of sound plastic products so as to effectively, orderly and effectively treat plastic pollution and strive to build a better ecological environment.
Therefore, the green manufacturing system is built by aiming at improving the product quality benefit and promoting the comprehensive green manufacturing, and the generation of three wastes in production is reduced.
Most of the rich bamboo resources in China are located in areas such as Fujian, Hunan, Sichuan, Guangxi, Guizhou, Yunnan and the like in the south, and have obvious regionality and regionality. The bamboo is a long and medium fiber raw material, has a large length-width ratio and a high cellulose content, for example, the cellulose content of the moso bamboo at the age of 1 year can reach about 75%. Besides the main bamboo fiber can be separated to prepare paper products, the bamboo liquid can also be used for extracting amino acid and trace elements contained in the bamboo liquid to prepare fresh bamboo juice stock solution, and the economic benefit of the bamboo material can be improved to a certain extent.
In the current papermaking process, as a large amount of processing technological conditions of high temperature, high pressure and strong alkalinity are adopted, most of effective components of bamboo leachate contained in the bamboo material are destroyed and decomposed, and the economic benefit of the bamboo material product is reduced. Therefore, a process capable of fully utilizing various raw materials in the papermaking process and improving the utilization rate of bamboo raw materials and the economic benefit of products needs to be developed.
Disclosure of Invention
The invention aims to provide a method for preparing a buffering packaging material by using bamboo fibers, which has the advantages that the stock solution of bamboo leachate is extracted by using ultrasonic waves, and the separated bamboo fibers are used as a foaming buffering material, so that the problem of complex extraction of the stock solution of the bamboo leachate is solved, and the raw materials are completely utilized by a simple and rapid production process.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The embodiment of the application provides a method for preparing a buffering packaging material by using bamboo fibers, which comprises the following steps: uniformly mixing the composite adhesive, the foaming agent, the plasticizer, the bamboo pulp, AKD, the curing agent and the gelling agent, and foaming at the temperature of 150 ℃ and 180 ℃ for 15-30min to obtain foaming slurry; and drying the foaming slurry at 75-85 ℃ for 10-12h, fixing and forming to obtain the buffering packaging material.
Compared with the prior art, the embodiment of the invention has at least the following advantages or beneficial effects:
(1) bamboo is taken as a resource, bamboo fiber is fully utilized in the extraction process of fresh bamboo juice, and the bamboo fiber is prepared into the cushioning packaging material through the following steps of specific foaming and the like, so that the waste of bamboo resources is avoided, and the production cost is reduced;
(2) through the combined treatment of micro-airflow and ultrasonic waves, the use of other chemicals in the preparation process of the bamboo pulp is avoided, the content of organic matters in the cooking liquor and the chemical oxygen demand thereof are reduced, no extra waste liquid is discharged in the whole process, and zero discharge and green pulping are really realized.
(3) The composite adhesive, the foaming agent, the plasticizer, the bamboo pulp, the AKD, the curing agent and the gelling agent in the optimal proportion are added, and the specific foaming temperature, foaming time and drying, fixing and forming temperature and time are combined, so that the buffering packaging material prepared by the method has good apparent density, and when the buffering material with the same volume is prepared, fewer raw materials than the prior art can be used due to small apparent density, namely, fewer bamboos and other chemicals can be used, and the production cost is reduced; meanwhile, the apparent density of the cushioning packaging material is small, and the cushioning packaging material has certain compressive strength, so that the cushioning packaging material has better compressive capacity and certain pressure-relieving space in the cushioning process; in addition, after the styrene-acrylic emulsion and the flame retardant are coated, the brighness value of the buffering packaging material prepared by the method provided by the invention is far higher than that of the existing corrugated board, and the prepared buffering packaging material has good flame-retardant and waterproof effects.
(4) The method for preparing the cushioning packaging material by using the bamboo fibers provided by the invention conforms to the national concept of green ecological economic development and is beneficial to coordination of ecological protection and market economy.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a general flow chart of a method for preparing a cushioning packaging material using bamboo fibers according to embodiments 1 to 3 of the present invention;
fig. 2 is a detailed flow chart of a method for preparing a cushioning packaging material using bamboo fibers provided in embodiments 1 to 3 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to specific examples.
The embodiment of the application provides a method for preparing a buffering packaging material by using bamboo fibers, which comprises the following steps: uniformly mixing the composite adhesive foaming agent, the plasticizer, the bamboo pulp, AKD, the curing agent and the gelling agent, and foaming at the temperature of 150 ℃ and 180 ℃ for 15-30min to obtain foaming slurry; and drying the foaming slurry at 75-85 ℃ for 10-12h, fixing and forming to obtain the buffering packaging material.
In some embodiments of the invention, in the method for preparing the buffer packaging material by using the bamboo fiber, the composite adhesive is formed by mixing gelatinized starch and a PVA aqueous solution, the mass ratio of the PVA to the gelatinized starch in the PVA aqueous solution is 1 (1.5-2), the foaming agent is a compound foaming agent of sodium bicarbonate and ADC, the plasticizer is glycerol, the curing agent is calcium carbonate, the AKD is a medium-alkaline sizing agent, and the gelling agent is borax.
In some embodiments of the present invention, in the method for preparing the cushioning packaging material by using the bamboo fiber, the mass of the composite adhesive is 18% to 28% of the oven dry weight of the bamboo pulp, the mass of the foaming agent is 2% to 5% of the oven dry weight of the bamboo pulp, the mass of the plasticizer is 5% to 10% of the oven dry weight of the bamboo pulp, the mass of the curing agent is 10% to 16% of the oven dry weight of the bamboo pulp, the mass of the AKD is 1% to 2% of the oven dry weight of the bamboo pulp, and the mass of the gelling agent is 0.1% to 0.2% of the oven dry weight of the bamboo pulp.
In some embodiments of the present invention, the method for preparing the cushioning packaging material by using the bamboo fiber further comprises coating a styrene-acrylic emulsion and a flame retardant on the surface of the cushioning packaging material, and drying the cushioning packaging material at 75-85 ℃ for 2-4 hours after the coating is finished.
In some embodiments of the present invention, the flame retardant in the above method for preparing a cushioning packaging material using bamboo fiber comprises guanidine sulfamate and guanidine phosphate, wherein the mass ratio of guanidine sulfamate to guanidine phosphate is 2: 3; the solid content of the styrene-acrylic emulsion is 30-35%.
In some embodiments of the present invention, the bamboo pulp in the above method for preparing a cushioning packaging material using bamboo fiber is prepared by the following steps: bamboo is used as a raw material and is subjected to chipping screening, steaming, micro-airflow ultrasonic combined treatment, high-concentration pulping, filter pressing cleaning and medium-concentration pulping to obtain bamboo pulp.
In some embodiments of the present invention, the micro-airflow ultrasonic wave combined treatment in the method for preparing the cushioning packaging material by using the bamboo fiber comprises the following steps: and (3) putting the steamed and softened bamboo chips into micro-airflow and ultrasonic equipment for extraction for 10-20min, separating extract liquor and bamboo fibers, cleaning and filtering the extract liquor to obtain a bamboo leachate stock solution, and grinding the bamboo fibers into high-concentration pulp, filter-pressing and cleaning and medium-concentration pulp to obtain bamboo pulp.
In some embodiments of the present invention, the length of the bamboo chips cut and selected in the method for preparing the cushioning packaging material by using the bamboo fibers is 8-60mm, and the thickness of the bamboo chips is 2-20 mm.
In some embodiments of the present invention, the steaming temperature in the above method for preparing the cushioning packaging material using bamboo fiber is 150 ℃ to 180 ℃, and the steaming time is 5-25 min.
In some embodiments of the invention, the pulp degree of the bamboo pulp obtained by high-concentration milling in the method for preparing the cushioning packaging material by using the bamboo fibers is 25-30 ° SR; the pulp degree of the bamboo pulp obtained by medium-consistency grinding is 45-55 DEG SR.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment aims to provide a method for preparing a cushioning packaging material by using bamboo fibers, which comprises the following steps:
(1) chipping and screening: slicing bamboo by a chipping machine, and screening bamboo chips with the length of 8-60mm and the thickness of 2-20 mm;
(2) steaming: placing the screened bamboo chips into a cooking pot, introducing high-temperature steam, heating to 160 ℃, and preserving heat for 18 min;
(3) micro-airflow and ultrasonic treatment: taking out the softened bamboo chips, collecting condensate, extracting the softened bamboo chips in the hot state in the micro-airflow and ultrasonic treatment, extracting the bamboo liquid into water, and dispersing bamboo fibers;
(4) high-concentration pulping: pulping the bamboo fiber treated by ultrasonic in a high-concentration mill, further extruding out solution in the fiber, and dispersing lignin and bamboo juice stock solution to obtain bamboo pulp with the pulping degree of 25-degree SR;
(5) filter pressing and cleaning: separating the bamboo juice stock solution, lignin and bamboo pulp fiber; obtaining clean bamboo pulp;
(6) medium-consistency grinding: carrying out medium-consistency pulping on the obtained bamboo pulp by a double-disc grinder, and increasing the pulping degree to 48-degree SR to obtain bamboo pulp, namely the raw material of the foaming buffer material;
(7) foaming and shaping:
A. starch gelatinization: preparing gelatinized starch from cationic starch with low substitution degree at 90 ℃, wherein the gelatinization concentration is 10%;
b, PVA dissolution: dissolving PVA at 70 ℃ to prepare a PVA aqueous solution, wherein the type of polyvinyl alcohol (PVA) is low-viscosity type;
C. mixing and foaming: uniformly mixing the gelatinized starch and the PVA aqueous solution according to the mass ratio of 2:1 to prepare a composite adhesive, and sequentially adding a foaming agent, a plasticizer, the bamboo pulp AKD prepared in the step (6), a curing agent and a gelling agent; the raw materials are fully and uniformly mixed by a stirrer and are uniformly foamed; pouring the slurry into a mold for shaping, and simultaneously placing the mold into an oven for foaming at 160 ℃ for 20 min;
the mass sum of the gelatinized starch and the PVA aqueous solution is 20 percent of the oven dry weight of the sizing agent; the foaming agent is a sodium bicarbonate and ADC compound foaming agent, and the mass of the foaming agent is 3% of the absolute dry weight of the bamboo pulp; the plasticizer is glycerol, and the mass of the plasticizer is 8% of the absolute dry weight of the bamboo pulp; the curing agent is calcium carbonate and is also used as a filler, and the mass of the curing agent is 12 percent of the absolute dry weight of the bamboo pulp; AKD is a medium-alkaline sizing agent, and the mass of the AKD is 1.5 percent of the oven dry weight of the bamboo pulp; the gel is borax, and the mass of the gel is 0.1 percent of the absolute dry weight of the bamboo pulp;
(8) drying and demolding: putting the shaped die into a far infrared dryer, drying at 85 ℃ for 10 hours for fixed molding, and taking out the dried buffer packaging material;
(9) coating: spraying and coating the formed buffer packaging material by a coating machine, wherein the spraying liquid is formed by compounding styrene-acrylic emulsion and a flame retardant; the styrene-acrylic emulsion is low-viscosity emulsion with the solid content of 32%, and the flame retardant is prepared from guanidine sulfamate and guanidine phosphate according to the mass ratio of 2: 3;
(10) and (3) drying: passing the coated buffer material through a far infrared drier again, drying for 3 hours at the temperature of 85 ℃;
(11) and (6) packaging and warehousing.
Example 2
The embodiment aims to provide a method for preparing a cushioning packaging material by using bamboo fibers, which comprises the following steps:
(1) chipping and screening: slicing bamboo by a chipping machine, and screening bamboo chips with the length of 8-60mm and the thickness of 2-20 mm;
(2) steaming: placing the screened bamboo chips into a cooking pot, introducing high-temperature steam, heating to 170 ℃, and keeping the temperature for 15 min;
(3) micro-airflow and ultrasonic treatment: taking out the softened bamboo chips, collecting condensate, extracting the softened bamboo chips in the hot state in the micro-airflow and ultrasonic treatment, extracting the bamboo liquid into water, and dispersing bamboo fibers;
(4) high-concentration pulping: pulping the bamboo fiber subjected to ultrasonic treatment in a high-concentration mill, further extruding out solution in the fiber, and dispersing lignin and bamboo juice stock solution to obtain bamboo pulp with the pulping degree of 27 DEG SR;
(5) filter pressing and cleaning: separating the bamboo juice stock solution, lignin and bamboo pulp fiber; obtaining clean bamboo pulp;
(6) medium-consistency grinding: carrying out medium-consistency pulping on the obtained bamboo pulp through a double-disc mill, and increasing the pulping degree to 53-degree SR to obtain bamboo pulp and obtain a raw material of the foaming buffer material;
(7) foaming and shaping
A. Starch gelatinization: preparing gelatinized starch from the cationic starch with low substitution degree at 90 ℃, wherein the gelatinization concentration is 12%;
b, PVA dissolution: dissolving PVA at 70 ℃ to prepare a PVA aqueous solution, wherein the type of polyvinyl alcohol (PVA) is low-viscosity type;
C. mixing and foaming: uniformly mixing the gelatinized starch and the PVA aqueous solution according to the mass ratio of 2:1 to prepare a composite adhesive, and sequentially adding a foaming agent, a plasticizer, the bamboo pulp prepared in the step (6), AKD, a curing agent and a gelling agent; the raw materials are fully and uniformly mixed by a stirrer and uniformly foamed; pouring the slurry into a mold for shaping, and simultaneously placing the mold into an oven for foaming for 19min at 170 ℃;
the mass sum of the gelatinized starch and the PVA aqueous solution is 25 percent of the oven dry weight of the sizing agent; the foaming agent is sodium bicarbonate and ADC compound foaming agent, and the mass of the foaming agent is 3.5% of the absolute dry weight of the bamboo pulp; the plasticizer is glycerol, and the mass of the plasticizer is 10% of the absolute dry weight of the bamboo pulp; the curing agent is calcium carbonate and is also used as a filler, and the mass of the curing agent is 15 percent of the absolute dry weight of the bamboo pulp; AKD is a medium-alkaline sizing agent, and the mass of the AKD is 1.8 percent of the oven dry weight of the bamboo pulp; the gel is borax, and the mass of the gel is 0.15 percent of the absolute dry weight of the bamboo pulp;
(8) drying and demolding: putting the shaped die into a far infrared drier, drying at the temperature of 80 ℃ for 11 hours, fixing and forming, and taking out the dried cushion packaging material;
(9) coating: spraying and coating the formed buffer packaging material by a coating machine, wherein the spraying liquid is formed by compounding styrene-acrylic emulsion and a flame retardant; the styrene-acrylic emulsion is low-viscosity emulsion with the solid content of 30 percent; the flame retardant is prepared from guanidine sulfamate and guanidine phosphate according to the mass ratio of 2: 3;
(10) and (3) drying: passing the coated buffer material through a far infrared drier again, drying at 80 deg.C for 3.5 hr;
(11) and (6) packaging and warehousing.
Example 3
The embodiment aims to provide a method for preparing a cushioning packaging material by using bamboo fibers, which comprises the following steps:
(1) chipping and screening: slicing bamboo by a chipping machine, and screening bamboo chips with the length of 8-60mm and the thickness of 2-20 mm;
(2) steaming: placing the screened bamboo chips into a cooking pot, introducing high-temperature steam, heating to 165 ℃, and keeping the temperature for 25 min;
(3) micro-airflow and ultrasonic treatment: taking out the softened bamboo chips, collecting condensate, extracting the softened bamboo chips in the hot state in the micro-airflow and ultrasonic treatment, extracting the bamboo liquid into water, and dispersing bamboo fibers;
(4) high-concentration pulping: pulping the bamboo fiber treated by ultrasonic in a high-concentration mill, further extruding out the solution in the fiber, and dispersing the lignin and the stock solution of the bamboo juice; obtaining bamboo pulp with beating degree of 26 DEG SR;
(5) filter pressing and cleaning: separating the bamboo juice stock solution, lignin and bamboo pulp fiber; obtaining clean bamboo pulp;
(6) medium-consistency grinding: carrying out medium-consistency pulping on the obtained bamboo pulp through a double-disc mill, and increasing the pulping degree to 55-degree SR to obtain bamboo pulp and obtain a raw material of the foaming buffer material;
(7) foaming and shaping:
A. starch gelatinization: preparing gelatinized starch from cationic starch with low substitution degree at 90 ℃, wherein the gelatinization concentration is 10%;
b, PVA dissolution: dissolving PVA at 70 ℃ to prepare a PVA aqueous solution, wherein the type of polyvinyl alcohol (PVA) is low-viscosity type;
C. mixing and foaming: uniformly mixing the gelatinized starch and the PVA aqueous solution according to the mass ratio of 3:2 to prepare a composite adhesive, and sequentially adding a foaming agent, a plasticizer, AKD, a curing agent, a gelling agent and the bamboo pulp prepared in the step (6); the raw materials are fully and uniformly mixed and uniformly foamed by a stirrer; pouring the slurry into a mold for shaping, and simultaneously placing the mold into an oven for foaming for 25min at 150 ℃;
the sum of the mass of the gelatinized starch and the PVA aqueous solution is 22 percent of the absolute dry weight of the sizing agent; the foaming agent is a sodium bicarbonate and ADC compound foaming agent, and the mass of the foaming agent is 4% of the absolute dry weight of the bamboo pulp; the plasticizer is glycerol, and the mass of the plasticizer is 9% of the absolute dry weight of the bamboo pulp; the curing agent is calcium carbonate and is also used as a filler, and the mass of the curing agent is 15 percent of the absolute dry weight of the bamboo pulp; AKD is a medium-alkaline sizing agent, and the mass of the AKD is 2% of the oven dry weight of the bamboo pulp; the gel is borax, and the mass of the gel is 0.2% of the absolute dry weight of the bamboo pulp;
(8) drying and demolding: placing the shaped die into a far infrared dryer, drying at 75 ℃ for 12 hours, fixing and forming, and taking out the dried cushion packaging material;
(9) coating: spraying and coating the formed buffer packaging material by a coating machine, wherein the spraying liquid is formed by compounding styrene-acrylic emulsion and a flame retardant; the styrene-acrylic emulsion is low-viscosity emulsion with the solid content of 30 percent; the flame retardant is prepared from guanidine sulfamate: guanidine phosphate is prepared by mixing the following components in a mass ratio of 2:3, configuring the components;
(10) and (3) drying: passing the coated buffer material through a far infrared drier again, drying at 82 deg.C for 3.5 hr;
(11) and (6) packaging and warehousing.
Example 4
The embodiment aims to provide a method for preparing a cushioning packaging material by using bamboo fibers, which comprises the following steps:
(1) chipping and screening: slicing bamboo by a chipping machine, and screening bamboo chips with the length of 8-60mm and the thickness of 2-20 mm;
(2) steaming: placing the screened bamboo chips into a cooking pot, introducing high-temperature steam, heating to 180 ℃, and preserving heat for 5 min;
(3) micro-airflow and ultrasonic treatment: taking out the softened bamboo chips, collecting condensate, extracting the softened bamboo chips in the hot state in the micro-airflow and ultrasonic treatment, extracting the bamboo liquid into water, and dispersing bamboo fibers;
(4) high-concentration pulping: pulping the bamboo fiber treated by ultrasonic in a high-concentration mill, further extruding out the solution in the fiber, and dispersing the lignin and the stock solution of the bamboo juice; obtaining bamboo pulp with beating degree of 30 DEG SR;
(5) filter pressing and cleaning: separating the bamboo juice stock solution, lignin and bamboo pulp fiber; obtaining clean bamboo pulp;
(6) medium-consistency grinding: carrying out medium-consistency pulping on the obtained bamboo pulp through a double-disc mill, and increasing the pulping degree to 45-degree SR to obtain bamboo pulp and obtain a raw material of the foaming buffer material;
(7) foaming and shaping:
A. starch gelatinization: preparing gelatinized starch from cationic starch with low substitution degree at 90 ℃, wherein the gelatinization concentration is 10%;
b, PVA dissolution: dissolving PVA at 70 ℃ to prepare a PVA aqueous solution, wherein the type of polyvinyl alcohol (PVA) is low-viscosity type;
C. mixing and foaming: uniformly mixing the gelatinized starch and the PVA aqueous solution according to the mass ratio of 1:1.8 to prepare a composite adhesive, and sequentially adding a foaming agent, a plasticizer, the bamboo pulp prepared in the step (6), AKD, a curing agent and a gelling agent into the composite adhesive; the raw materials are fully and uniformly mixed by a stirrer and uniformly foamed; pouring the slurry into a mold for shaping, and simultaneously placing the mold into an oven for foaming for 30min at 170 ℃;
the mass sum of the gelatinized starch and the PVA aqueous solution is 25 percent of the oven dry weight of the sizing agent; the foaming agent is a sodium bicarbonate and ADC compound foaming agent, and the mass of the foaming agent is 5% of the absolute dry weight of the bamboo pulp; the plasticizer is glycerol, and the mass of the plasticizer is 6% of the absolute dry weight of the bamboo pulp; the curing agent is calcium carbonate and is also used as a filler, and the mass of the curing agent is 16 percent of the absolute dry weight of the bamboo pulp; AKD is a medium-alkaline sizing agent, and the mass of the AKD is 1.3 percent of the oven dry weight of the bamboo pulp; the gel is borax, and the mass of the gel is 0.2% of the absolute dry weight of the bamboo pulp;
(8) drying and demolding: placing the shaped die into a far infrared dryer, drying at 80 ℃ for 12 hours, fixing and forming, and taking out the dried cushion packaging material;
(9) coating: spraying and coating the formed buffer packaging material by a coating machine, wherein the spraying liquid is formed by compounding styrene-acrylic emulsion and a flame retardant; the styrene-acrylic emulsion is low-viscosity emulsion with the solid content of 35 percent; the flame retardant is prepared from guanidine sulfamate: guanidine phosphate is prepared by mixing the following components in a mass ratio of 2:3, configuring the components;
(10) and (3) drying: passing the coated buffer material through a far infrared drier again, drying for 4 hours at the temperature of 85 ℃;
(11) and (6) packaging and warehousing.
Example 5
The embodiment aims to provide a method for preparing a cushioning packaging material by using bamboo fibers, which comprises the following steps:
(1) chipping and screening: slicing bamboo by a chipping machine, and screening bamboo chips with the length of 8-60mm and the thickness of 2-20 mm;
(2) steaming: placing the screened bamboo chips into a cooking pot, introducing high-temperature steam, heating to 150 ℃, and preserving heat for 20 min;
(3) micro-airflow and ultrasonic treatment: taking out the softened bamboo chips, collecting condensate, extracting the softened bamboo chips in the hot state in the micro-airflow and ultrasonic treatment, extracting the bamboo liquid into water, and dispersing bamboo fibers;
(4) high-concentration pulping: pulping the bamboo fiber treated by ultrasonic in a high-concentration mill, further extruding out the solution in the fiber, and dispersing the lignin and the stock solution of the bamboo juice; obtaining bamboo pulp with beating degree of 27 DEG SR;
(5) filter pressing and cleaning: separating the bamboo juice stock solution, lignin and bamboo pulp fiber; obtaining clean bamboo pulp;
(6) medium-consistency grinding: carrying out medium-consistency pulping on the obtained bamboo pulp through a double-disc mill, and increasing the pulping degree to 53-degree SR to obtain bamboo pulp and obtain a raw material of the foaming buffer material;
(7) foaming and shaping:
A. starch gelatinization: preparing gelatinized starch from cationic starch with low substitution degree at 90 ℃, wherein the gelatinization concentration is 10%;
b, PVA dissolution: dissolving PVA at 70 ℃ to prepare a PVA aqueous solution, wherein the type of polyvinyl alcohol (PVA) is low-viscosity type;
C. mixing and foaming: uniformly mixing the gelatinized starch and the PVA aqueous solution according to the mass ratio of 1:1.8 to prepare a composite adhesive, and sequentially adding a foaming agent, a plasticizer, the bamboo prepared in the step (6), AKD, a curing agent, a gelling agent and the like; the raw materials are fully and uniformly mixed and uniformly foamed by a stirrer; pouring the slurry into a mold for shaping, and simultaneously placing the mold into an oven for foaming for 15min at 180 ℃;
the mass sum of the gelatinized starch and the PVA aqueous solution is 18 percent of the oven dry weight of the sizing agent; the foaming agent is a sodium bicarbonate and ADC compound foaming agent, and the mass of the foaming agent is 2% of the absolute dry weight of the bamboo pulp; the plasticizer is glycerol, and the mass of the plasticizer is 5% of the absolute dry weight of the bamboo pulp; the curing agent is calcium carbonate and is also used as a filler, and the mass of the curing agent is 10 percent of the absolute dry weight of the bamboo pulp; AKD is a medium-alkaline sizing agent, and the mass of the AKD is 1% of the oven dry weight of the bamboo pulp; the gel is borax, and the mass of the gel is 0.15 percent of the absolute dry weight of the bamboo pulp;
(8) drying and demolding: placing the shaped die into a far infrared dryer, drying at the temperature of 80 ℃, fixing and forming for 11 hours, and taking out the dried cushion packaging material;
(9) coating: spraying and coating the formed buffer packaging material by a coating machine, wherein the spraying liquid is formed by compounding styrene-acrylic emulsion and a flame retardant; the styrene-acrylic emulsion is low-viscosity emulsion with the solid content of 35 percent; the flame retardant is prepared from guanidine sulfamate: guanidine phosphate is prepared by mixing the following components in a mass ratio of 2:3, configuring the components;
(10) and (3) drying: passing the coated buffer material through a far infrared drier again, drying for 2 hours at the temperature of 75 ℃;
(11) and (6) packaging and warehousing.
Examples of effects
The purpose of this effect example is to verify the performance of the cushioning packaging material prepared by the method for preparing the cushioning packaging material using bamboo fibers provided in examples 1 to 3, and specifically, as shown in table 1:
TABLE 1
Item Apparent density g/cm3 Bobby number (g/m)2) Compressive strength/kPa
Example 1 0.155 35.1 612
Example 2 0.148 33.1 568
Example 3 0.141 32.1 498
Example 4 0.136 34.6 412
Example 5 0.144 35.9 527
In summary, the method for preparing the cushioning packaging material by using the bamboo fiber provided by the embodiment of the invention has the following advantages:
(1) bamboo is taken as a resource, bamboo fiber is fully utilized in the extraction process of fresh bamboo juice, and the bamboo fiber is prepared into the cushioning packaging material through the following steps of specific foaming and the like, so that the waste of bamboo resources is avoided, and the production cost is reduced;
(2) through the combined treatment of micro-airflow and ultrasonic waves, the use of other chemicals in the preparation process of the bamboo pulp is avoided, the content of organic matters in the cooking liquor and the chemical oxygen demand thereof are reduced, no extra waste liquid is discharged in the whole process, and zero discharge and green pulping are really realized.
(3) By adding the composite adhesive, the foaming agent, the plasticizer, the bamboo pulp, the AKD, the curing agent and the gelling agent in the optimal proportion and combining the specific foaming temperature, the foaming time and the temperature and time for drying, fixing and forming, the buffer packaging material prepared by the method provided by the invention has good apparent density, and when the buffer material with the same volume is prepared, because the apparent density is small, fewer raw materials can be used than the prior art, namely fewer bamboos and other chemicals can be used, so that the production cost is reduced; meanwhile, the buffer packaging material has small apparent density and high compressive strength, so that the buffer packaging material has better compressive capacity and a certain pressure relief space in the buffer process; in addition, after the styrene-acrylic emulsion and the flame retardant are coated, the brighness value of the buffering packaging material prepared by the method is far higher than that of the existing corrugated cardboard, and the prepared buffering packaging material has good flame-retardant waterproof effect.
(4) The method for preparing the cushioning packaging material by using the bamboo fibers provided by the invention conforms to the national concept of green ecological economic development and is beneficial to coordination of ecological protection and market economy.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Claims (10)

1. A method for preparing a cushioning packaging material by using bamboo fibers is characterized by comprising the following steps: uniformly mixing the composite adhesive, the foaming agent, the plasticizer, the bamboo pulp, AKD, the curing agent and the gelling agent, and foaming at the temperature of 150 ℃ and 180 ℃ for 15-30min to obtain foaming slurry; and drying the foaming slurry at 75-85 ℃ for 10-12h, fixing and forming to obtain the buffering packaging material.
2. The method for preparing a cushioning packaging material using bamboo fiber according to claim 1, wherein: the composite adhesive is formed by mixing gelatinized starch and a PVA aqueous solution, the mass ratio of the PVA to the gelatinized starch in the PVA aqueous solution is 1 (1.5-2), the foaming agent is a compound foaming agent of sodium bicarbonate and ADC, the plasticizer is glycerol, the curing agent is calcium carbonate, the AKD is a medium-alkaline sizing agent, and the gelling agent is borax.
3. The method for preparing a cushioning packaging material using bamboo fiber according to claim 2, wherein: the composite adhesive comprises, by mass, 18-28% of the oven-dry amount of bamboo pulp, 2-5% of a foaming agent, 5-10% of a plasticizer, 10-16% of a curing agent, 1-2% of AKD and 0.1-0.2% of a gelling agent.
4. The method for preparing a cushioning packaging material using bamboo fiber as claimed in claim 1, further comprising coating styrene-acrylic emulsion and a flame retardant on the surface of the cushioning packaging material, and drying the cushioning packaging material at 75-85 ℃ for 2-4 hours after the coating is completed.
5. The method for preparing a cushioning packaging material by using bamboo fibers as claimed in claim 4, wherein the flame retardant comprises guanidine sulfamate and guanidine phosphate, and the mass ratio of the guanidine sulfamate to the guanidine phosphate is 2: 3; the solid content of the styrene-acrylic emulsion is 30-35%.
6. The method for preparing a cushioning packaging material using bamboo fiber according to any one of claims 1 to 5, wherein the bamboo pulp is prepared by the steps of: bamboo is used as a raw material and is subjected to chipping screening, steaming, micro-airflow ultrasonic combined treatment, high-concentration pulping, filter pressing cleaning and medium-concentration pulping to obtain bamboo pulp.
7. The method for preparing a cushioning packaging material by using bamboo fibers as claimed in claim 6, wherein the micro-air flow ultrasonic wave combined treatment comprises the following steps: and (3) putting the steamed and softened bamboo chips into micro-airflow and ultrasonic equipment for extraction for 10-20min, separating extract liquor and bamboo fibers, cleaning and filtering the extract liquor to obtain a bamboo leachate stock solution, and grinding the bamboo fibers into high-concentration pulp, filter-pressing and cleaning and medium-concentration pulp to obtain bamboo pulp.
8. The method for preparing a cushioning packaging material using bamboo fibers as claimed in claim 6, wherein the length of the bamboo chips cut and screened by the chipping is 8-60mm, and the thickness of the bamboo chips is 2-20 mm.
9. The method for preparing a cushioning packaging material using bamboo fiber as claimed in claim 6, wherein the steaming temperature is 150 ℃ to 180 ℃ and the steaming time is 5-25 min.
10. The method for preparing the cushioning packaging material by using the bamboo fibers as claimed in claim 6, wherein the pulp degree of the bamboo pulp obtained by the high-consistency grinding and beating is 25-30 ° SR; the pulp degree of the bamboo pulp obtained by medium-consistency grinding is 45-55 DEG SR.
CN202011211101.5A 2020-11-03 2020-11-03 Method for preparing cushioning packaging material by using bamboo fibers Pending CN112878110A (en)

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