CN112853821A - Paper pulp molding product with high tensile strength and high tearing resistance and preparation process thereof - Google Patents

Paper pulp molding product with high tensile strength and high tearing resistance and preparation process thereof Download PDF

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Publication number
CN112853821A
CN112853821A CN202110034426.9A CN202110034426A CN112853821A CN 112853821 A CN112853821 A CN 112853821A CN 202110034426 A CN202110034426 A CN 202110034426A CN 112853821 A CN112853821 A CN 112853821A
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Prior art keywords
tensile strength
parts
product
fibers
pulp
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CN202110034426.9A
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Chinese (zh)
Inventor
罗礼发
陈一
吴培桂
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Zhengye Package Zhongshan Co ltd
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Zhengye Package Zhongshan Co ltd
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Priority to CN202110034426.9A priority Critical patent/CN112853821A/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J5/00—Manufacture of hollow articles by transferring sheets, produced from fibres suspensions or papier-mâché by suction on wire-net moulds, to couch-moulds
    • 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
    • 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
    • D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
    • D21H13/02—Synthetic cellulose fibres
    • D21H13/06—Cellulose esters
    • 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
    • D21H17/005—Microorganisms or enzymes
    • 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
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • 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
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/47—Condensation polymers of aldehydes or ketones
    • 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
    • D21H21/16—Sizing or water-repelling 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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Paper (AREA)

Abstract

The invention discloses a high-tensile strength and high-tearing resistance pulp molding product and a preparation process thereof, wherein a fiber composite raw material comprising paperboard fibers, plant fibers, starch grafted acrylamide, cellulose diacetate, hydroxyl polyethylene glycol aldehyde groups and a small amount of auxiliary materials is used for replacing the traditional paperboard fibers, a process similar to the traditional pulp molding process is used in the former forming process, and innovation and improvement are carried out in the later drying and shaping process, so that the prepared pulp molding product has high strength and tearing resistance characteristics and can be used in the field of packaging with higher requirements on mechanical properties.

Description

Paper pulp molding product with high tensile strength and high tearing resistance and preparation process thereof
Technical Field
The invention relates to the field of packaging, in particular to a high-tensile-strength high-tearing-resistance paper pulp molding product and a preparation process thereof.
Background
Along with the rapid development of express delivery, a large amount of carton cartons are used for express delivery packing in the society at present, simultaneously because its recovery recycles the not enough of technique, leads to a large amount of carton packing to be abandoned at will, has also aroused the problem of environment. How to efficiently and scientifically develop a novel material by using express paper packaging is one of important ways for treating express packaging pollution.
In the field of waste paper utilization, the most widely used technology is pulp molding, which has significant advantages. The paper pulp molding is characterized by using waste newspaper and carton paper as main raw materials, pulping by using additives in a certain proportion, dehydrating and molding by using a special mold, and performing a series of processes such as drying, heat treatment, shaping and the like. The paper pulp molding product can be recycled and degraded, has good waterproof and oil-proof performance after being added with a special process, can completely replace a plastic foaming product, can effectively eliminate white pollution, and has good environmental protection performance. Secondly, the product cost is economical. The paper pulp molding technology is developed and innovated for years, the equipment performance is continuously improved, the production process is gradually mature, and the production cost of products tends to be stable. At present, the production cost of domestic paper support products is basically equal to that of foamed plastic products, and the cost of some paper support products is obviously lower than that of the foamed plastic products. Although the advantages are obvious, the improvement is also needed, wherein the main defects are that the mechanical property of the pulp molding product is weak, the bonding strength between paper fibers is insufficient, and the plastic material product still has a larger gap and is only suitable for the low-end packaging field with lower requirement on the mechanical property. With the promulgation of plastic forbidden orders, the use limit of plastic products is more and more large, for example, the performance of the paper pulp molding products can be further improved, and the replacement of partial plastic products can be realized, so that the paper pulp molding products have great economic value.
In the previous studies, a lot of studies have focused on the development of pulp molding processes and equipment to improve the moldability of pulp moldings, or to add a small amount of water-and oil-resistant substances to solve the problems such as water absorption of paper fibers themselves, for example, the 201880083355.8 patent discloses a pulp molded product and a method for manufacturing the same, in which a small amount of water-soluble macromolecules insoluble in an aqueous medium at 40 degrees are added to a slurry, and the product has good water and oil resistance after molding; however, the ways in which the mechanical properties of pulp moldings can be really improved are still not abundant. To solve this problem, the bonding between fibers is mainly required to be improved to strengthen the strength of the product, and this requires improvement in the formulation of the pulp, and the improved formulation is also required to be adapted to the preparation process of pulp molding. The invention provides an improved paper pulp molding formula, which not only ensures the environmental protection property, but also can effectively improve the mechanical property of products, and can be processed and formed by adopting the existing paper pulp molding process, thereby having good popularization value.
Disclosure of Invention
The invention mainly aims to provide a high-tensile-strength and high-tearing-resistance pulp molded product with high tensile strength and high-tearing-resistance and a preparation process thereof.
The invention provides a high-tensile strength and high-tearing resistance paper pulp molding product and a preparation process thereof, wherein the paper pulp molding product comprises the following components: 65-80 parts of paperboard fiber, 8-18 parts of plant fiber, 3-6 parts of starch grafted acrylamide, 2-4 parts of cellulose diacetate, 2-4 parts of hydroxyl polyethylene glycol aldehyde group and 1-3 parts of auxiliary agent.
Preferably, the degree of substitution of the cellulose diacetate is between 1.5 and 2.0.
Preferably, the grafting rate in the starch grafted acrylamide is between 12 and 20 percent based on the mass fraction of the acrylamide.
Preferably, the molecular weight of the hydroxyl polyethylene glycol aldehyde group is between 5000-8000, and the molecular structural formula is as follows:
Figure BDA0002893592380000021
preferably, the plant fiber is one or more of bagasse fiber, straw fiber, reed fiber, wood fiber and bamboo fiber in any proportion.
Preferably, the high tensile strength and high tear resistance pulp molded article consists of the following components: 65-80 parts of paperboard fiber, 8-18 parts of plant fiber, 3-6 parts of starch grafted acrylamide, 2-4 parts of cellulose diacetate, 2-4 parts of hydroxyl polyethylene glycol aldehyde group and 1-3 parts of auxiliary agent. The preparation method comprises the following steps:
1) putting the paperboard fibers into a beating machine, adding pure water, and beating into paper pulp, wherein the mass concentration of the paper pulp is between 5 and 10 percent;
2) crushing plant fibers, putting into water of 40 ℃ to prepare a suspension liquid with the mass fraction of 3-6%, uniformly stirring, standing for 30-60 minutes, cooling to 20-30 ℃, adding pectinase, uniformly stirring, standing for 15-30 minutes, adding cellulase, uniformly stirring, standing for 5-10 minutes, heating to boil, keeping for 3-5 minutes to inactivate the enzyme, and primarily filtering to obtain a wet plant fiber material; the addition amount of the pectinase is between 0.2 and 0.5 percent of the mass of the plant fiber, the addition amount of the cellulase is between 0.1 and 0.3 percent of the mass of the plant fiber respectively, and the water content in the wet plant fiber material is between 20 and 50 percent;
3) dissolving cellulose diacetate in acetone to prepare a solution with the mass concentration of 4-6%, adding the solution into a wet plant fiber material, stirring at the rotating speed of 300-450rmp for 20-40 minutes, uniformly mixing, heating to 40-50 ℃, keeping for 30-60 minutes, and distilling out the acetone to obtain the cellulose diacetate-coated plant fiber;
4) putting plant fibers wrapped by cellulose diacetate into paper pulp, adding hydroxyl polyethylene glycol aldehyde group, stirring for 5-10 minutes until the mixture is uniform, adding starch grafted acrylamide, quickly stirring for 5-10 minutes at 200-300rmp, then sequentially adding an auxiliary agent solution with the mass concentration of 5-10%, stirring uniformly, adding pure water, and adjusting the mass fraction of the slurry to 5-10% to obtain the final slurry.
5) Carrying out vacuum slurry absorption on the final slurry on a special metal mold to obtain a wet blank product;
6) the wet green article is dried.
7) And (5) preparing a final finished product in a hot pressing and shaping mode.
Preferably, the assistant is any combination of water-proof agent and oil-proof agent, and the assistant can be added into the paper pulp in one step in the form of mixed assistant solution or sequentially in the form of different assistant solutions.
Preferably, the wet-green product is dried by drying the wet green with hot air to a moisture content of between 30-50%.
Preferably, the hot pressing and shaping process is to reform the dried wet green product at the temperature of 160-200 ℃ and the pressure of 6-10MP for 5-10 minutes.
The high-tensile strength and high-tearing resistance paper pulp molding product and the preparation process have the beneficial effects that:
1. the cell walls on the surface of the plant fibers treated by the enzyme are broken to form a large number of rough structures which can be tightly combined with the pulp fibers.
2. The invention adopts the mode that the plant fiber is partially wrapped by the cellulose diacetate, the bonding effect among the fibers can be improved, and particularly for the plant fiber which plays the role of connection and framework, the treatment mode is favorable for improving the strength and tearing resistance of the whole material.
3. The starch grafted acrylamide and hydroxyl polyethylene glycol aldehyde group with certain stereo structures can generate Schiff base reaction of amino and aldehyde group in the drying and thermal finishing process after forming to further improve the integrity of the product.
4. The invention adjusts the conditions in the drying and thermal reforming process stages of the molding process, and keeps higher water content in the drying stage, thereby ensuring that all substances have certain activity to realize reaction and effective combination at high temperature and high pressure during reforming.
Drawings
FIG. 1 is a flow chart of the high tensile strength and high tear resistance pulp molded product and the preparation process of the invention;
the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, there is provided an example 1 of the high tensile strength and high tear resistance pulp molded article and the preparation process of the present invention:
a preparation process of a paper pulp molding product with high tensile strength and high tearing resistance comprises the following raw materials in corresponding proportion:
72 parts of paperboard fiber
12 portions of plant fiber
Starch grafted acrylamide 4.5 parts
Cellulose diacetate 3.5 parts
2.4 parts of hydroxyl polyethylene glycol aldehyde group
Auxiliary agent 2 parts
The paper pulp molding product is molded according to the following process steps:
1) putting the paper board fiber into a beating machine, adding pure water into the beating machine, beating the paper pulp, wherein the mass concentration of the paper pulp is 8%, the paper board fiber is the combination of a corrugated board and a honeycomb paper board, and the mass ratio of the paper pulp to the honeycomb paper board is 1: 1;
2) crushing plant fibers, and then putting into water at 40 ℃ to prepare a suspension with the mass fraction of 5%, wherein the plant fibers are bagasse fibers and straw fibers in a mass ratio of 1:1 in the composition of claim 1. The diameter of the crushed plant fiber is less than 80 μm, and the length-diameter ratio is between 20 and 80. Standing for 50 minutes after uniformly stirring, then cooling to 25 ℃, adding pectinase, standing for 20 minutes after uniformly stirring, adding cellulase, standing for 8 minutes after uniformly stirring, then heating to boiling for 4 minutes to inactivate the enzyme, and primarily filtering to obtain a wet plant fiber material; the addition amount of the pectinase and the cellulase is respectively 0.4 percent and 0.2 percent of the mass of the plant fiber, and the water content of the wet plant fiber material is 35 percent;
3) cellulose diacetate was dissolved in acetone to prepare a solution having a mass concentration of 5%, and the degree of substitution of the cellulose diacetate was 1.9. Adding into wet plant fiber material, stirring at 400rmp for 30 min, heating to 45 deg.C, maintaining for 40 min, and distilling off acetone to obtain cellulose diacetate coated plant fiber;
4) putting the plant fiber wrapped by the cellulose diacetate into the paper pulp, and then adding hydroxyl polyethylene glycol aldehyde group, wherein the molecular weight of the hydroxyl polyethylene glycol aldehyde group is 6000. Stirring for 7 minutes until the mixture is uniform, adding starch grafted acrylamide, wherein the grafting ratio of the starch grafted acrylamide is 15 percent calculated by the mass fraction of the acrylamide, quickly stirring for 8 minutes at 250rmp, adding an auxiliary agent solution with the mass concentration of 8 percent, stirring uniformly, adding pure water, and adjusting the mass fraction of the slurry to 8 percent to obtain the final slurry. The auxiliary agent is a commercially available water-resistant agent and an oil-resistant agent, and the mass ratio of the water-resistant agent to the oil-resistant agent is 1: and 1, diluting the slurry with water respectively until the mass concentration is 8%, and adding the diluted slurry into the slurry in sequence, wherein the time interval between the addition of the water and the addition of the slurry is 5 minutes.
5) And (3) carrying out vacuum slurry absorption on the final slurry on a special metal mould in a rotary drum vacuum slurry absorption mode to obtain a wet blank product.
6) The wet green product was dried and the wet green was dried with hot air to a moisture content of 40%.
7) The dried wet green product was reformed at 180 ℃ for 8 minutes at 7.5MP pressure to produce the final product.
The pulp moldings produced in this example were tested according to the following criteria:
method for measuring tensile strength of GB/T453 paper and paperboard (constant rate drawing method)
Method for measuring moisture of GB/T462 paper and paperboard
Determination of tearing strength of GB/T455 paper and cardboard
GB/T4857.5 packaging and transporting package drop test method
GB/T4857.7 packaging and transporting packaging piece sine fixed-frequency vibration test method
Standard atmospheric conditions for processing and testing GB/T10739 pulp, paper and cardboard test specimens
The properties of the obtained pulp molding product are as follows:
mass deviation is less than or equal to +/-2.2
The water content is less than or equal to 9.5 percent
Tensile strength (kN/m): 16.2 ═ 16.2
Tear index (mN. m)2/g)：＝12.4
Percent elongation: 25.4 ═
Moisture resistance test%: 56 ═ c
Vibration test: the packaged material has no functional damage and no scratch on the surface
Drop test: when the product is packaged, the product does not lose fibers.
Referring to fig. 1, there is proposed an example 2 of the high tensile strength and high tear resistance pulp molded article and the preparation process of the present invention:
a preparation process of a paper pulp molding product with high tensile strength and high tearing resistance comprises the following raw materials in corresponding proportion:
68 portions of paperboard fiber
16 portions of plant fiber
Starch grafted acrylamide 4.5 parts
Cellulose diacetate 3 parts
3.2 parts of hydroxyl polyethylene glycol aldehyde group
Auxiliary agent 2.5 parts
The paper pulp molding product is molded according to the following process steps:
(1) putting the paperboard fibers into a beating machine, adding pure water, and beating into paper pulp, wherein the mass concentration of the paper pulp is 6.5%; the paperboard fiber is a composition consisting of honeycomb paperboard and box paperboard in a mass ratio of 2: 1;
(2) crushing plant fibers, and putting into water at 40 ℃ to prepare a suspension with the mass fraction of 5%, wherein the composition is composed of the plant fibers, reed fibers and wood fibers in a mass ratio of 1: 1. The diameter of the crushed plant fiber is less than 100 μm, and the length-diameter ratio is between 30 and 60. Standing for 45 minutes after uniformly stirring, then cooling to 25 ℃, adding pectinase, standing for 20 minutes after uniformly stirring, adding cellulase, standing for 8 minutes after uniformly stirring, then heating to boiling for 4 minutes to inactivate the enzyme, and primarily filtering to obtain a wet plant fiber material; the addition amounts of the pectinase and the cellulase are respectively 0.4 percent and 0.25 percent of the mass of the plant fiber, and the water content of the wet plant fiber material is 45 percent;
(3) cellulose diacetate was dissolved in acetone to prepare a solution having a mass concentration of 4.5% and a degree of substitution of cellulose diacetate was 1.6. Adding into wet plant fiber material, stirring at 320rmp for 30 min, heating to 45 deg.C, maintaining for 50 min, and distilling off acetone to obtain cellulose diacetate coated plant fiber;
(4) putting plant fiber wrapped by cellulose diacetate into paper pulp, and adding hydroxyl polyethylene glycol aldehyde group with molecular weight of 7500. Stirring for 8 minutes till the mixture is uniform, and then adding starch grafted acrylamide, wherein the grafting rate of the starch grafted acrylamide is 16.5 percent calculated by the mass fraction of the acrylamide. And (3) rapidly stirring for 6 minutes at 280rmp, adding an auxiliary agent solution with the mass concentration of 6%, uniformly stirring, and adding pure water to adjust the mass fraction of the slurry to 7% to obtain the final slurry. The auxiliary agent is a commercially available water-resistant agent and an oil-resistant agent, and the mass ratio of the water-resistant agent to the oil-resistant agent is 2:1, diluting the mixture respectively with water until the mass concentration is 6%, and adding the diluted mixture into the slurry simultaneously.
5) And (3) carrying out vacuum slurry absorption on the final slurry on a special metal mould in a reciprocating lifting type vacuum slurry absorption mode to obtain a wet blank product.
6) The wet green product was dried and the wet green was dried with hot air to a moisture content of 35%.
7) The dried wet green product is reformed for 6 minutes at 190 ℃ under the pressure of 8MP to prepare the final finished product.
The pulp moldings of this example were tested according to the following criteria:
method for measuring tensile strength of GB/T453 paper and paperboard (constant rate drawing method)
Method for measuring moisture of GB/T462 paper and paperboard
Determination of tearing strength of GB/T455 paper and cardboard
GB/T4857.5 packaging and transporting package drop test method
GB/T4857.7 packaging and transporting packaging piece sine fixed-frequency vibration test method
Standard atmospheric conditions for processing and testing GB/T10739 pulp, paper and cardboard test specimens
The properties of the obtained pulp molding product are as follows:
mass deviation is less than or equal to +/-2.0
Water content%
Tensile strength (kN/m): 15.4 ═ 15.4
Tear index (mN. m)2/g)：＝13.2
Percent elongation: 32.4 ═ 32.4
Moisture resistance test%: 62 ═ 62
Vibration test: the packaged material has no functional damage and no scratch on the surface
Drop test: when the product is packaged, the product does not lose fibers.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the contents of the present specification and the drawings, or any other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A paper pulp molding product with high tensile strength and high tearing resistance is characterized by comprising the following components: 65-80 parts of paperboard fiber, 8-18 parts of plant fiber, 3-6 parts of starch grafted acrylamide, 2-4 parts of cellulose diacetate, 2-4 parts of hydroxyl polyethylene glycol aldehyde group and 1-3 parts of auxiliary agent.
2. The high tensile strength and tear resistance pulp molded article according to claim 1, wherein the substitution degree of the cellulose diacetate is between 1.5 and 2.0.
3. The high tensile strength and tear resistance pulp molded article according to claim 1, wherein the grafting ratio in the starch grafted acrylamide is between 12-20% by mass fraction of acrylamide.
4. The pulp molding product with high tensile strength and tear resistance as claimed in claim 1, wherein the molecular weight of the hydroxyl polyethylene glycol aldehyde group is between 5000-8000.
5. The high-tensile-strength and high-tear-resistance pulp molding product according to claim 1, wherein the plant fibers are one or more of bagasse fibers, straw fibers, reed fibers, wood fibers and bamboo fibers in any proportion.
6. A preparation process of a paper pulp molded product with high tensile strength and high tearing resistance is characterized in that the paper pulp molded product with high tensile strength and high tearing resistance comprises the following components: 65-80 parts of paperboard fiber, 8-18 parts of plant fiber, 3-6 parts of starch grafted acrylamide, 2-4 parts of cellulose diacetate, 2-4 parts of hydroxyl polyethylene glycol aldehyde group and 1-3 parts of auxiliary agent. The preparation method comprises the following steps:
1) putting the paperboard fibers into a beating machine, adding pure water, and beating into paper pulp, wherein the mass concentration of the paper pulp is between 5 and 10 percent;
2) crushing plant fibers, putting into water of 40 ℃ to prepare a suspension liquid with the mass fraction of 3-6%, uniformly stirring, standing for 30-60 minutes, cooling to 20-30 ℃, adding pectinase, uniformly stirring, standing for 15-30 minutes, adding cellulase, uniformly stirring, standing for 5-10 minutes, heating to boil, keeping for 3-5 minutes to inactivate the enzyme, and primarily filtering to obtain a wet plant fiber material; the addition amount of the pectinase is between 0.2 and 0.5 percent of the mass of the plant fiber, the addition amount of the cellulase is between 0.1 and 0.3 percent of the mass of the plant fiber respectively, and the water content in the wet plant fiber material is between 20 and 50 percent;
3) dissolving cellulose diacetate in acetone to prepare a solution with the mass concentration of 4-6%, adding the solution into a wet plant fiber material, stirring at the rotating speed of 300-450rmp for 20-40 minutes, uniformly mixing, heating to 40-50 ℃, keeping for 30-60 minutes, and distilling out the acetone to obtain the cellulose diacetate-coated plant fiber;
4) putting plant fibers wrapped by cellulose diacetate into paper pulp, adding hydroxyl polyethylene glycol aldehyde group, stirring for 5-10 minutes until the mixture is uniform, adding starch grafted acrylamide, quickly stirring for 5-10 minutes at 200-300rmp, then sequentially adding an auxiliary agent solution with the mass concentration of 5-10%, stirring uniformly, adding pure water, and adjusting the mass fraction of the slurry to 5-10% to obtain the final slurry.
5) Carrying out vacuum slurry absorption on the final slurry on a special metal mold to obtain a wet blank product;
6) drying the wet green product;
7) and (5) preparing a final finished product in a hot pressing and shaping mode.
7. The process for preparing the pulp molding product with high tensile strength and tearing resistance according to claim 6, wherein the auxiliary agent is any combination of water-resistant agent and oil-resistant agent, and the auxiliary agent can be added into the pulp in a mixed auxiliary agent solution form at one time or sequentially added in different auxiliary agent solution forms.
8. The process for preparing pulp molded product with high tensile strength and tear resistance as claimed in claim 6, wherein the pulp is sucked in vacuum in a drum, a turn-over type, a reciprocating lift type.
9. The process for preparing pulp moulded product with high tensile strength and tear resistance as claimed in claim 6, wherein the wet blank product is dried by hot air to a moisture content of 30-50%.
10. The process for preparing a pulp molded product with high tensile strength and tearing resistance as claimed in claim 6, wherein the hot pressing and shaping process comprises reforming the dried wet green product at 160-200 ℃ and 6-10MP for 5-10 min.
CN202110034426.9A 2021-01-12 2021-01-12 Paper pulp molding product with high tensile strength and high tearing resistance and preparation process thereof Pending CN112853821A (en)

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