CN112277403B - Preparation method of high-strength environment-friendly product - Google Patents
Preparation method of high-strength environment-friendly product Download PDFInfo
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- CN112277403B CN112277403B CN202011049330.1A CN202011049330A CN112277403B CN 112277403 B CN112277403 B CN 112277403B CN 202011049330 A CN202011049330 A CN 202011049330A CN 112277403 B CN112277403 B CN 112277403B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/08—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer the fibres or filaments of a layer being of different substances, e.g. conjugate fibres, mixture of different fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/08—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the cooling method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/028—Net structure, e.g. spaced apart filaments bonded at the crossing points
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
- B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
- B32B5/26—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it also being fibrous or filamentary
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
- C08L1/02—Cellulose; Modified cellulose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/02—Synthetic macromolecular fibres
- B32B2262/0276—Polyester fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/06—Vegetal fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/06—Vegetal fibres
- B32B2262/062—Cellulose fibres, e.g. cotton
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/14—Mixture of at least two fibres made of different materials
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
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- Polymers & Plastics (AREA)
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Abstract
The invention discloses a preparation method of a high-strength environment-friendly product, which is formed by taking waste paper boards as main materials, adding plant fibers, electrostatic spinning poly epsilon-caprolactone fibers, polyethylene oxide and ethylene-vinyl acetate copolymer, compounding to form blanks according to a certain structure, and then putting the blanks into a molding machine for low-temperature compression molding.
Description
Technical Field
The invention relates to the field of packaging, in particular to a preparation method of a high-strength environment-friendly product.
Background
With the rapid development of express delivery in the current society, a large number of paper box cartons are used for express delivery packaging, and meanwhile, due to the defect of recycling technology, a large number of paper box packages are discarded at will, so that the environmental problem is caused. Therefore, how to develop novel materials by using the express paper package with high efficiency and science is one of important ways for treating express package pollution.
On the other hand, a large number of living materials are developed by taking plastics as raw materials, and the plastics generate a large amount of pollution and resource consumption, so that the environment problem caused by the plastics is highly emphasized in China, and strict plastic forbidden orders are successively issued in 1 month and 7 months in 2020, so that the use of plastic packaging products is forbidden, and the requirements on degradable material substitutes of the plastics are very high. Various biomass degradable binders are used in the development of this field, such as starch, plant fibers, biopolyesters such as polylactic acid, etc. In a comprehensive view, the preparation of the plastic material by utilizing the waste paperboard resources is a development mode which is very environment-friendly and has application prospect, but the technology difficulty is very high.
The paper board consists of paper fibers, and the paper fiber is difficult to be recycled and used as a product independently, so that on one hand, the plant fibers are insoluble and infusible, the processing fluidity is very poor, and on the other hand, the problem that the strength of the product needs to be solved if uniform and tight combination of the plant fibers is realized.
Among the numerous processing modes, molding is the most suitable mode for processing fibers, long-distance displacement is not needed, mutual aggregation in the flowing process is generated, processing difficulty caused by flowability difference between the fibers and other substances is avoided, and the problem still needs to be solved if the bonding strength of the fibers is improved in molding.
Previous studies have proposed various approaches to solve this problem, such as the incorporation of a flowable resin such as polyethylene, polystyrene, etc. into the molding material, but this approach also suffers from contamination due to plastic flaking after degradation, and such as greatly increasing the compaction of the blank, which increases the density of the article and thus the cost, which also affects the application. The preparation method of the die-pressed product with high strength, low cost and environmental protection is found, the application range and the application value of the waste paperboard are greatly improved, and the method has great practical significance.
Disclosure of Invention
The invention mainly aims to provide a preparation method of a high-strength environment-friendly product with high fiber content and high strength by taking waste paper boards as main raw materials.
The preparation method of the high-strength environment-friendly product comprises the steps of taking waste paper boards as main materials, adding plant fibers, electrostatic spinning poly epsilon-caprolactone fibers, polyethylene oxide and ethylene-vinyl acetate copolymer, compounding to form blanks according to a certain structure, and then putting the blanks into a molding press for low-temperature compression molding; the mass ratio of each component is compounded according to the following parts: 60-80 parts of waste paper board, 10-20 parts of plant fiber, 8-14 parts of electrostatic spinning poly epsilon-caprolactone fiber, 2-4 parts of polyethylene oxide and 2-4 parts of ethylene-vinyl acetate copolymer; the preparation method comprises the following steps:
1) Crushing the waste paper board, sieving to obtain waste paper board fibers with the size smaller than 400 meshes, adding the waste paper board fibers into water to prepare suspension with the mass concentration of 6-8%, heating to 40-55 ℃, adding cellulase, uniformly stirring, standing for 30-60 minutes, cooling to 15-25 ℃, adding laccase, uniformly stirring, standing for 30-50 minutes, heating to boiling, keeping for 3-5 minutes to inactivate enzymes, and filtering to obtain waste paper board fiber wet materials; taking the quality of the fiber as a standard, the addition amount of the cellulase and the laccase is respectively between 30 and 60U/g and 100 and 200U/g;
2) Crushing plant fibers in a crusher, soaking the fibers in NaOH aqueous solution with the mass concentration of between 6 and 12 percent and the temperature of between 25 and 35 ℃ for 3 to 6 hours, flushing the fibers with distilled water until the pH value reaches between 7 and 8, drying the fibers until the water content of the fibers is between 100 and 150 percent, putting the fibers into a flash explosion device for steam flash explosion, setting the temperature in the flash explosion device to be between 60 and 80 ℃ and the pressure between 3 and 6MPa, and carrying out flash explosion for 4 to 6 times to obtain plant fiber materials;
3) Uniformly mixing wet waste paperboard fiber materials, plant fiber materials, polyethylene oxide aqueous solution and ethylene-vinyl acetate copolymer emulsion, drying until the water content is between 20 and 40 percent to obtain a material I, uniformly dividing the material I with the molding dosage each time into 3 to 5 equal parts of cuboid materials, uniformly spreading one layer of electrostatic spinning poly epsilon-caprolactone fiber between every two layers, compounding multiple layers of materials, drying, and controlling the water content to be between 3 and 6 percent to obtain molded blanks; wherein the mass concentration of the polyethylene oxide aqueous solution and the ethylene-vinyl acetate copolymer emulsion is respectively between 10 and 20 percent and between 40 and 55 percent;
4) Putting the blank into a mould at 40-55 ℃, preheating for 5-10 minutes, starting pressing, wherein the pressure is between 0.5 and 1.5MPa, the temperature is between 70 and 90 ℃, and pressure is maintained for 2-4 minutes, and then pressure relief forming is performed;
5) And (3) placing the molded product in an environment of 0-5 ℃ for 30-60 minutes for quick cooling to obtain a final product.
Preferably, the thickness of the cuboid material is between 1 cm and 3 cm.
The preparation method of the high-strength environment-friendly product has the beneficial effects that:
the method is characterized in that a mode of combining short fibers, medium fibers and long fibers is adopted in a mould pressing blank, and a small amount of adhesive high polymers are matched to realize strong combination of a matrix, wherein the waste paper board is short fibers after being treated by biological enzymes, the mutual combination is good after being treated by compound enzymes, plant fibers are medium fibers after being subjected to steam flash explosion, the surface roughness is easy to combine with the short fibers, and electrostatic spinning fibers are long fibers, and the short fibers, the medium fibers and the medium fibers are combined with each other, wherein the short fibers are similar to a filler, the long fibers play a role in connection, and the long fibers play a role in skeleton; secondly, two water-soluble macromolecules play the purpose of bonding and combining short fibers, the two water-soluble macromolecules have certain fluidity in the molding process after moisture drying, and play a role of bonding, wherein polyethylene oxide is Cheng Niange, ethylene-vinyl acetate copolymer plays a role of short-range bonding, and finally, a layer of electrostatic spinning long fibers is paved between two layers of short-medium fiber composites with certain thickness, so that the effect of sufficiently improving the strength of molded products is achieved, and the cost is directly increased if the number of layers of the long fibers is too large.
Drawings
FIG. 1 is a flow chart of a method of making a high strength environmental protection article of the present invention;
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
An embodiment of a method for preparing a high strength environmental protection product according to the present invention is presented with reference to fig. 1:
a high-strength product taking waste paperboard fibers as a main raw material is prepared from the following components in parts by weight:
65 parts of waste paperboard
Plant fiber 16 parts
12 parts of electrostatic spinning poly epsilon-caprolactone fiber
Polyethylene oxide 3 parts
Ethylene-vinyl acetate copolymer 3.5 parts
The plant fiber is straw fiber, the diameter of the crushed fiber is between 10 and 40 mu m, and the length-diameter ratio is between 20 and 50.
The waste paperboard is prepared from corrugated paperboard and linerboard by combining at a ratio of 9:1.
The ethylene-vinyl acetate copolymer has a molecular weight of between 80000 and 120000 and an ethylene molar content of between 50 and 55%.
The preparation process of the high-strength environment-friendly product comprises the following steps:
(1) Treatment of waste paper board: crushing and sieving the waste paper board to obtain waste paper board fiber with the size smaller than 400 meshes, putting the waste paper board fiber into water to prepare suspension with the mass concentration of 7%, heating to 45 ℃, adding cellulase, stirring uniformly, standing for 50 minutes, cooling to 20 ℃, adding laccase, stirring uniformly, standing for 40 minutes, heating to boiling, keeping for 4 minutes to inactivate enzymes, and filtering to obtain waste paper board fiber wet material; taking the quality of the fiber as a standard, the addition amounts of the cellulase and the laccase are 45U/g and 160U/g respectively;
(2) Treatment of plant fibers: crushing plant fibers in a crusher, soaking the fibers in NaOH aqueous solution with the mass concentration of 8% and the temperature of 30 ℃ for 4 hours, flushing the fibers with distilled water until the pH value reaches 7.5, drying the fibers to keep the water content of 120%, putting the materials into a flash explosion device for steam flash explosion, setting the temperature in the flash explosion device to 70 ℃ and the pressure to 5MPa, and obtaining plant fiber materials after 5 times of flash explosion;
(3) Preparation of a molded blank: uniformly mixing wet waste paperboard fibers, plant fiber materials, polyethylene oxide aqueous solution and ethylene-vinyl acetate copolymer emulsion, drying until the water content is 30%, obtaining a material I, uniformly dividing the material I with the blank consumption required by each mould pressing into 4 equal parts of cuboid materials, uniformly spreading a layer of poly epsilon-caprolactone fibers with the diameter of 20-50 mu m between every two layers, uniformly arranging the poly epsilon-caprolactone fibers in a grid manner between layers, drying, and controlling the water content to be 5.5%, thus obtaining mould pressing blanks; wherein the mass concentration of the polyethylene oxide aqueous solution and the ethylene-vinyl acetate copolymer emulsion is 12.5 percent and 50 percent respectively;
(4) Compression molding: putting the blank into a 50 ℃ die, preheating for 8 minutes, starting pressing, keeping the pressure at 1.2MPa and the temperature at 80 ℃, and performing pressure relief molding after keeping the pressure for 3 minutes;
(5) Post-treatment: and (5) placing the molded product in an environment of 1 ℃ for 50 minutes for rapid cooling to obtain a final product.
The processed product is prepared into standard sample bars, and the test result according to the plastic test standard is as follows:
| tensile Strength | 32.6MPa |
| Tensile modulus | 0.88GPa |
| Compressive Strength | 45.4MPa |
| Impact strength | 7.2KJ/m 2 |
| Elongation at break | 86.5％ |
| Flexural Strength | 32.2MPa |
| Flexural modulus | 0.78GPa |
| Density of | 1.02Kg/m 3 |
Another embodiment of the method for preparing a high strength green article of the present invention is presented with reference to fig. 1:
a high-strength product taking waste paperboard fibers as a main raw material is prepared from the following components in parts by weight:
65 parts of waste paperboard
18 parts of plant fiber
10 parts of electrostatic spinning poly epsilon-caprolactone fiber
Polyethylene oxide 2.5 parts
Ethylene-vinyl acetate copolymer 3 parts
The plant fiber is prepared by mixing reed and flax at a mass ratio of 1:1, the diameter of the broken fiber is between 5 and 20 mu m, and the length-diameter ratio is between 20 and 50.
The raw materials of the waste paperboard fibers are the mixture of corrugated paperboard and honeycomb paperboard with the mass ratio of 1:1.
The ethylene-vinyl acetate copolymer has a molecular weight of between 90000 and 130000 and an ethylene molar content of between 48 and 52%.
The preparation process of the high-strength environment-friendly product comprises the following steps:
(1) Treatment of waste paper board: crushing and sieving the waste paper board to obtain waste paper board fibers smaller than 300 meshes, adding the waste paper board fibers into water to prepare suspension with the mass concentration of 6.5%, heating to 42 ℃, adding cellulase, uniformly stirring, standing for 45 minutes, cooling to 18 ℃, adding laccase, uniformly stirring, standing for 45 minutes, heating to boiling, keeping for 4 minutes to inactivate enzymes, and filtering to obtain waste paper board fiber wet materials; taking the quality of the fiber as a standard, the addition amounts of cellulase and laccase are 55U/g and 140U/g respectively;
(2) Treatment of plant fibers: crushing plant fibers in a crusher, soaking the fibers in NaOH aqueous solution with the mass concentration of 10% and the temperature of 32 ℃ for 5 hours, flushing the fibers with distilled water until the pH value reaches 7.2, drying the fibers until the water content of the fibers reaches 140%, putting the materials into a flash explosion device for steam flash explosion, setting the temperature in the flash explosion device to 75 ℃ and the pressure between 5.5MPa, and obtaining plant fiber materials after 5 times of flash explosion;
(3) Preparation of a molded blank: uniformly mixing wet waste paperboard fibers, plant fiber materials, polyethylene oxide aqueous solution and ethylene-vinyl acetate copolymer emulsion, drying until the water content is 25%, uniformly dividing the material I with the blank consumption required by each mould pressing into 3 equal parts of cuboid materials, uniformly spreading poly epsilon-caprolactone fibers with the diameter of 40-80 mu m between every two layers, uniformly and randomly arranging the poly epsilon-caprolactone fibers among layers, compounding multiple layers of materials, drying, and controlling the water content to be 4%, thus obtaining mould pressing blanks; wherein the mass concentration of the polyethylene oxide aqueous solution and the ethylene-vinyl acetate copolymer emulsion is 16.5 percent and 45 percent respectively;
(4) Compression molding: putting the blank into a 52 ℃ die, preheating for 7 minutes, starting pressing, wherein the pressure is 0.7MPa, the temperature is 85 ℃, and pressure maintaining is carried out for 3.5 minutes, and then pressure relief forming is carried out;
(5) Post-treatment: and (3) placing the molded product in an environment of 3 ℃ for 40 minutes for rapid cooling to obtain a final product.
The processed product is prepared into standard sample bars, and the test result according to the plastic test standard is as follows:
| tensile Strength | 35.4MPa |
| Tensile modulus | 0.87GPa |
| Compressive Strength | 42.5MPa |
| Impact strength | 7.2KJ/m 2 |
| Elongation at break | 125.4％ |
| Flexural Strength | 31.4MPa |
| Flexural modulus | 0.77GPa |
| Density of | 0.98Kg/m 3 |
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the present invention and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the present invention.
Claims (2)
1. A preparation method of a high-strength environment-friendly product is characterized in that the high-strength environment-friendly product takes waste paper boards as main materials, and is formed by adding plant fibers, electrostatic spinning poly epsilon-caprolactone fibers, polyethylene oxide and ethylene-vinyl acetate copolymer, compounding the materials in a certain structure to form a blank, and then putting the blank into a molding machine for low-temperature compression molding; the mass ratio of each component is compounded according to the following parts: 60-80 parts of waste paper board, 10-20 parts of plant fiber, 8-14 parts of electrostatic spinning poly epsilon-caprolactone fiber, 2-4 parts of polyethylene oxide and 2-4 parts of ethylene-vinyl acetate copolymer; the preparation method comprises the following steps:
1) Crushing the waste paper board, sieving to obtain waste paper board fibers with the size smaller than 400 meshes, adding the waste paper board fibers into water to prepare suspension with the mass concentration of 6-8%, heating to 40-55 ℃, adding cellulase, uniformly stirring, standing for 30-60 minutes, cooling to 15-25 ℃, adding laccase, uniformly stirring, standing for 30-50 minutes, heating to boiling, keeping for 3-5 minutes to inactivate enzymes, and filtering to obtain waste paper board fiber wet materials; taking the quality of the fiber as a standard, the addition amount of the cellulase and the laccase is respectively between 30 and 60U/g and 100 and 200U/g;
2) Crushing plant fibers in a crusher, soaking the fibers in NaOH aqueous solution with the mass concentration of between 6 and 12 percent and the temperature of between 25 and 35 ℃ for 3 to 6 hours, flushing the fibers with distilled water until the pH value reaches between 7 and 8, drying the fibers until the water content of the fibers is between 100 and 150 percent, putting the fibers into a flash explosion device for steam flash explosion, setting the temperature in the flash explosion device to be between 60 and 80 ℃ and the pressure between 3 and 6MPa, and carrying out flash explosion for 4 to 6 times to obtain plant fiber materials;
3) Uniformly mixing wet waste paperboard fiber materials, plant fiber materials, polyethylene oxide aqueous solution and ethylene-vinyl acetate copolymer emulsion, drying until the water content is between 20 and 40 percent to obtain a material I, uniformly dividing the material I with the molding dosage each time into 3 to 5 equal parts of cuboid materials, uniformly spreading one layer of electrostatic spinning poly epsilon-caprolactone fiber between every two layers, compounding multiple layers of materials, drying, and controlling the water content to be between 3 and 6 percent to obtain molded blanks; wherein the mass concentration of the polyethylene oxide aqueous solution and the ethylene-vinyl acetate copolymer emulsion is respectively between 10 and 20 percent and between 40 and 55 percent;
4) Putting the blank into a mould at 40-55 ℃, preheating for 5-10 minutes, starting pressing, wherein the pressure is between 0.5 and 1.5MPa, the temperature is between 70 and 90 ℃, and pressure is maintained for 2-4 minutes, and then pressure relief forming is performed;
5) And (3) placing the molded product in an environment of 0-5 ℃ for 30-60 minutes for quick cooling to obtain a final product.
2. The method for preparing a high strength environmental protection product according to claim 1, wherein the thickness of the cuboid material is between 1 cm and 3 cm.
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Citations (4)
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|---|---|---|---|---|
| US6340407B1 (en) * | 1999-12-22 | 2002-01-22 | Sun Ho Chung | Process of making recycled linerboard or Kraft paper from old corrugated container |
| CN104292785A (en) * | 2014-10-29 | 2015-01-21 | 正业包装（中山）有限公司 | Recycled paper fiber-polylactic acid composite material and preparation method thereof. |
| CN104356425A (en) * | 2014-10-29 | 2015-02-18 | 正业包装（中山）有限公司 | Preparation method for environment-friendly recycled paperboard fiber composite degradable film material |
| CN109054316A (en) * | 2018-06-07 | 2018-12-21 | 正业包装（中山）有限公司 | Ecological environment-friendly packaging material and preparation method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE1050985A1 (en) * | 2010-09-22 | 2012-03-23 | Stora Enso Oyj | A paper or paperboard product and a process of manufacture of a paper or paperboard product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6340407B1 (en) * | 1999-12-22 | 2002-01-22 | Sun Ho Chung | Process of making recycled linerboard or Kraft paper from old corrugated container |
| CN104292785A (en) * | 2014-10-29 | 2015-01-21 | 正业包装（中山）有限公司 | Recycled paper fiber-polylactic acid composite material and preparation method thereof. |
| CN104356425A (en) * | 2014-10-29 | 2015-02-18 | 正业包装（中山）有限公司 | Preparation method for environment-friendly recycled paperboard fiber composite degradable film material |
| CN109054316A (en) * | 2018-06-07 | 2018-12-21 | 正业包装（中山）有限公司 | Ecological environment-friendly packaging material and preparation method thereof |
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