CN113174780B - Full-degradable dry-pressed aviation lunch box and preparation method thereof - Google Patents

Full-degradable dry-pressed aviation lunch box and preparation method thereof Download PDF

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Publication number
CN113174780B
CN113174780B CN202110453663.9A CN202110453663A CN113174780B CN 113174780 B CN113174780 B CN 113174780B CN 202110453663 A CN202110453663 A CN 202110453663A CN 113174780 B CN113174780 B CN 113174780B
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pulp
lunch box
pressed
dry
pulp board
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CN113174780A (en
Inventor
王建华
管正光
陈华
陈波
杨凡
杨仁党
毛长斌
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Hangzhou Xihongshi Environmental Protection Technology Co ltd
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Hangzhou Xihongshi Environmental Protection Technology Co ltd
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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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/59—Shaping sheet material under pressure
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/07—Nitrogen-containing 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
    • D21H17/03—Non-macromolecular organic compounds
    • D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
    • D21H17/14—Carboxylic acids; Derivatives thereof
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/66—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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)

Abstract

The invention discloses a preparation method of a fully-degradable dry-pressed aviation lunch box, which comprises the following steps: 1) Placing a reel-shaped or flat pulp board into a steeping fluid for steeping for 5 to 30 minutes, wherein the steeping fluid is a mixed solution of zinc nitrate hexahydrate solution and hexamethylenetetramine solution which have the same volume; 2) Taking out the pulp board impregnated in the step 1), placing the pulp board at the temperature of between 50 and 60 ℃ for 5 to 10 minutes, and then immersing the pulp board into a stearic acid solution for 5 to 10 minutes; 3) Taking out the impregnated pulp plate in the step 2) and slicing; 4) And stacking the sliced pulp plates, then dry-pressing the pulp plates into the shape of an aviation lunch box, and transferring and trimming to obtain a final product. The high-quality fully-degradable dry-pressed aviation lunch box is obtained by immersing the pulp board in special immersion liquid for a short time, directly slicing and molding at high temperature, and has the characteristics of super-hydrophobicity and ultraviolet resistance, and the production cost is obviously reduced. The pulp board raw materials can adopt bamboo and common crop waste as pulp raw materials, and no environmental pollution pressure exists from the source to the finished product.

Description

Full-degradable dry-pressed aviation lunch box and preparation method thereof
Technical Field
The invention relates to an environment-friendly paper pulp aviation lunch box and the production technical field thereof.
Background
Pulp molding is a three-dimensional papermaking technique. It uses waste paper, wood pulp or other plant fibre as raw material, and uses a special mould to mould a pulp product with a certain form on the moulding machine. It has four major advantages: 1. the raw materials are waste paper, wood pulp or other plant fibers, including paperboard, waste paper box paper, waste white edge paper, softwood pulp, hardwood pulp, bamboo pulp, bagasse pulp and the like, and the sources are wide; 2. the manufacturing process is completed by the working procedures of pulping, adsorption molding, drying and shaping and the like, the flow is short, and the environment is not harmful; 3. the product can be recycled; 4. the volume ratio of the foamed plastic is small, the weight is light, the plastic can be overlapped, and the transportation is convenient. The pulp molding product can be used as a lunch box and tableware, and can also be used as an industrial buffer package, and the development is very rapid at present.
However, in the current paper pulp molding field, the cost and the product selling price are still high due to the cost of raw and auxiliary materials, the subsequent process of the raw materials, the power consumption of an auxiliary system, the labor cost and the like, and the product sales volume and the popularization rate are influenced. In addition, the existing pulp molded products cannot be used as aviation tableware because of poor hydrophobicity and ultraviolet resistance.
Disclosure of Invention
The invention aims to solve the existing problems and provides a low-cost fully-degradable dry-pressed aviation lunch box which has the characteristics of super-hydrophobicity and ultraviolet resistance.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a fully-degradable dry-pressed aviation lunch box comprises the following steps:
1) Placing the reel-shaped or flat-sheet-shaped pulp plate into an impregnating solution for impregnating for 5-30 minutes, wherein the impregnating solution is a mixed solution of zinc nitrate hexahydrate solution and hexamethylenetetramine solution which have the same volume;
2) Taking out the pulp board impregnated in the step 1), placing the pulp board at the temperature of between 50 and 60 ℃ for 5 to 10 minutes, and then immersing the pulp board into a stearic acid solution for 5 to 10 minutes;
3) Taking out the impregnated pulp plate in the step 2) and slicing;
4) And stacking the sliced pulp plates, then dry-pressing into the shape of an aviation lunch box, and transferring and trimming to obtain the final product.
Further, the first impregnation in step 1) is preferably carried out at 80 to 100 ℃ for 5 to 10 minutes. Furthermore, the concentration of the zinc nitrate hexahydrate solution is 0.02-1.0M, and the concentration of the hexamethylenetetramine solution is 0.02-1.0M.
Further, in the second impregnation in the step 2), the concentration of the stearic acid solution is 0.5-1.0 g/L. Furthermore, the water content of the pulp board after the secondary impregnation is controlled to be 15-30%.
The conventional preservative, waterproof agent and/or oil-proof agent and the like are not added into the dipping solution in the step 1) or 2). After two-step impregnation, the product after dry pressing has the characteristics of super-hydrophobicity and ultraviolet resistance.
Further, the length and width of the reel-shaped or flat pulp sheet are selected or customized according to the requirement of the produced aviation lunch box product. Further, to accommodate the dry-press forming step and to improve product quality, the fiber properties of the pulp sheet in roll or sheet form are selected: weight-average length of 1.5-1.7 mm, weight-average width of 18-20 μm, thickness of 14-18 mg/100m, crimp index of 12-18%, and softness of 1.2-1.6 × 10 18 /N·m 2 . The reel-shaped or flat-sheet-shaped pulp board fiber sources comprise natural fully-degradable fiber raw materials such as bagasse, wood, bamboo, reed and the like.
Further, in the step 4), the dry pressing and shaping conditions are as follows: the pressure intensity is 30-50 kg/cm 2 The temperature is 150-200 ℃, and the time is 5-20 s.
The invention has the beneficial effects that:
according to the method provided by the invention, the pulp sheet is dipped in the special dipping solution for a short time, directly sliced and molded and shaped at a high temperature to obtain the high-quality fully-degradable dry-pressed aviation lunch box, and the product has the characteristics of super-hydrophobicity and ultraviolet resistance, so that the production cost is obviously reduced.
The pulp board raw materials can adopt bamboo and common crop waste as pulp raw materials, and the obtained product is a green environment-friendly fully-degradable material, so that no environmental pollution pressure exists from the source to the finished product. The product can be directly discarded after being used and naturally degraded into planting soil and improve soil quality; or the soil is crushed and reduced into planting soil for reuse or discarded.
The technical scheme of the invention is described in an exemplary way in the following with reference to the attached drawings.
Drawings
Fig. 1 is a top view and a cross-sectional view of a fully degradable dry pressed pulp aviation lunch box provided by an embodiment of the invention.
Fig. 2 is a front view of the completely degradable dry pressed pulp aviation lunch box provided by the embodiment of the invention.
Fig. 3 is a perspective reference view of the completely degradable dry pressed pulp aviation lunch box provided by the embodiment of the invention.
Detailed Description
The following examples are given to illustrate the practice of the present invention in detail. The technical parameters and auxiliaries which are not specifically mentioned in the examples below can be selected routinely and adaptively by the person skilled in the art on the basis of the knowledge in the technical field.
The preparation method of the full-degradable dry-pressed aviation lunch box provided by the embodiment comprises the following steps:
1) Placing the reel-shaped or flat pulp board into a steeping fluid for steeping for 5 to 30 minutes, wherein the steeping fluid is a mixed solution of zinc nitrate hexahydrate solution and hexamethylenetetramine solution which have the same volume;
2) Taking out the pulp board impregnated in the step 1), placing the pulp board at the temperature of between 50 and 60 ℃ for 5 to 10 minutes, and then immersing the pulp board into a stearic acid solution for 5 to 10 minutes;
3) Taking out the impregnated pulp plate in the step 2) and slicing;
4) And stacking the sliced pulp plates, then dry-pressing into the shape of an aviation lunch box, and transferring and trimming to obtain the final product.
The production method is adopted to form the disposable environment-friendly aviation lunch box by hot pressing and shaping.
Example 1
The raw material is 100% of sugarcane pulp board. The specification of the pulp sheet: the width of the reel pulp is 920/900/820mm, and the fiber performance is as follows: weight-average length of 1.5mm, weight-average width of 18 μm, thickness of 15mg/100m, curl index of 13%, softness of 1.3X 10 18 /N·m 2 。
Step 1) impregnation liquid: the mixed solution of zinc nitrate hexahydrate and hexamethylenetetramine solution with equal volumes, the concentration of the zinc nitrate hexahydrate solution is 0.05M, and the concentration of the hexamethylenetetramine solution is 0.08M; soaking at 90 + -2 deg.C for 7 min. The addition amount of the oven-dried pulp is as follows according to the mass ratio: 1.0 percent.
And 2), taking out the soaked sugarcane pulp board, placing the sugarcane pulp board at the temperature of 55 +/-2 ℃ for 10 minutes, then soaking the sugarcane pulp board in a stearic acid solution with the concentration of 0.68g/L for 8 minutes, measuring that the water content of the pulp board is 26%, and taking out the pulp board.
Step 3) slicing the dipped pulp board, wherein the size is as follows: 550X 970mm.
Step 4), the pressure is 35kg/cm 2 And stacking the sliced pulp sheets at the temperature of 190 ℃, performing dry pressing on mold dry pressing equipment with the shape for the aviation lunch box, and performing one-step forming for 8 seconds to obtain the finished shape of the aviation lunch box as shown in figures 1 to 3.
The disposable aviation lunch box formed by direct dry pressing meets the technical standards on the market in the aspects of strength, water resistance, oil resistance and the like, and has the characteristic of ultraviolet resistance.
Example 1 brief comparison with conventional Molding Process
Pulping, pulping and pulp mixing Impregnation Die cutting Form transfer Drying the mixture
Conventional production method 180min 0 0 30s 30s
Example 1 Cancellation 15min 25min 6s 2s
This example can improve production efficiency by 77.8%.
Example 2
The raw material is 100% bamboo pulp board. The specification of the pulp sheet: the fiber performance of the reel pulp with the width of 920/900/820mm is as follows: weight average length of 1.5mm, weight average width of 18 μm, thickness of 15mg/100m, curl index of 13%, softness of 1.3X 10 18 /N·m 2 。
Step 1) impregnation liquid: the mixed solution of zinc nitrate hexahydrate and hexamethylenetetramine solution with equal volumes, the concentration of the zinc nitrate hexahydrate solution is 0.08M, and the concentration of the hexamethylenetetramine solution is 1.0M; soaking at 80 + -2 deg.C for 7 min. The addition amount of the oven-dried pulp according to the mass proportion is as follows: 1.5 percent.
And 2), taking out the soaked sugarcane pulp board, placing the sugarcane pulp board at 55 +/-2 ℃ for 6 minutes, then soaking the sugarcane pulp board in a stearic acid solution with the concentration of 0.68g/L for 8 minutes, measuring that the water content of the pulp board is 28%, and taking out the pulp board.
Step 3) slicing the dipped pulp plate, wherein the size is as follows: 550X 970mm.
Step 4), the pressure is 45kg/cm 2 And stacking the sliced pulp sheets at the temperature of 190 ℃, performing dry pressing on mold dry pressing equipment with the shape for the aviation lunch box, and performing one-step forming for 8 seconds to obtain the finished shape of the aviation lunch box as shown in figures 1 to 3.
The disposable aviation lunch box formed by direct dry pressing meets the technical standards sold in the market on the properties of strength, water resistance, oil resistance and the like, and has the characteristic of ultraviolet resistance.
Example 2 brief comparison with conventional Molding Process
Pulping, pulping and pulp mixing Impregnation Die cutting Form transfer Drying
Conventional production method 180min 0 0 30s 30s
Example 2 Cancellation 15min 25min 6s 2s
This example can improve the production efficiency by 77.8%.
Brief comparison of examples 1 and 2 with the molded product of the market ordinary pulp lunch box
Contact Angle with Water (°) Ultraviolet transmittance (%)
General products 85.3 8.24
Example 1 147.1 4.85
Example 2 162.4 3.48
The paper pulp molding aviation lunch box obtained in the embodiment is a green environment-friendly fully-degradable material, and can be directly discarded after being discarded and naturally degraded into planting soil and improve soil quality, or be crushed and reduced into planting soil for reuse or discarded.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (9)

1. A preparation method of a fully-degradable dry-pressed aviation lunch box comprises the following steps:
1) Placing a reel-shaped or flat pulp board into a steeping liquor for steeping for 5-30 minutes, wherein the steeping liquor is a mixed liquor of zinc nitrate hexahydrate solution and hexamethylenetetramine solution which have the same volume;
2) Taking out the pulp board impregnated in the step 1), placing the pulp board at the temperature of between 50 and 60 ℃ for 5 to 10 minutes, and then immersing the pulp board into a stearic acid solution for 5 to 10 minutes;
3) Taking out the impregnated pulp plate in the step 2) and slicing; the dipping solutions in the step 1) and the step 2) are not added with the existing preservative, waterproof agent and/or oil-proof agent;
4) And stacking the sliced pulp plates, then dry-pressing into the shape of an aviation lunch box, and transferring and trimming to obtain the final product.
2. A method of making a fully degradable dry pressed aerospace lunchbox as claimed in claim 1 wherein: step 1) dipping for 5-10 minutes at 80-100 ℃.
3. A method of making a fully degradable dry pressed aerospace lunchbox as claimed in claim 1 wherein: the concentration of the zinc nitrate hexahydrate solution is 0.02-1.0M, and the concentration of the hexamethylenetetramine solution is 0.02-1.0M.
4. A method of making a fully degradable dry pressed aircraft cutlery box as claimed in claim 1, wherein: the concentration of the stearic acid solution is 0.5-1.0 g/L.
5. A method of making a fully degradable dry pressed aircraft cutlery box as claimed in claim 1, wherein: the water content of the impregnated pulp board in the step 2) is 15-30%.
6. A method of making a fully degradable dry pressed aircraft cutlery box as claimed in claim 1, wherein: the reel-shaped or flat-sheet-shaped pulp board fiber sources comprise natural fully-degradable fiber raw materials such as bagasse, wood, bamboo, reed and the like.
7. Fully degradable stem as claimed in claim 1The preparation method of the pressed aviation lunch box is characterized in that: selection of fiber properties for roll or sheet pulp: weight-average length of 1.5-1.7 mm, weight-average width of 18-20 μm, thickness of 14-18 mg/100m, curl index of 12-18%, softness of 1.2-1.6 × 10 18 /N·m 2 。
8. A method of making a fully degradable dry pressed aerospace lunchbox as claimed in claim 1 wherein: the dry pressing and shaping conditions of the step 4) are as follows: the pressure intensity is 30-50 kg/cm 2 The temperature is 150-200 ℃, and the time is 5-20 s.
9. An aircraft lunch box obtained by the method for preparing a fully degradable dry pressed aircraft lunch box according to any one of claims 1-8.
CN202110453663.9A 2021-04-26 2021-04-26 Full-degradable dry-pressed aviation lunch box and preparation method thereof Active CN113174780B (en)

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CN113174780B true CN113174780B (en) 2023-03-17

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BRPI0805561C1 (en) * 2008-12-24 2013-05-07 Masisa Do Brasil Ltda Process for the production of aroma-containing plate and plate produced by such process
CN102898885B (en) * 2012-10-23 2014-06-18 中国科学技术大学 Cheap modified paint self-cleaning coating with super-hydrophobicity and preparation method and application thereof
CN104532664B (en) * 2014-11-27 2017-02-01 安徽理工大学 Universal preparation method for self-cleaning superhydrophobic paper
CN109797604A (en) * 2019-02-18 2019-05-24 杭州西红柿环保科技有限公司 A kind of environment-friendly paper pulp mould-forming method and product

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