CN113580668B - Preparation method of self-adhesive and water-stable paper straw - Google Patents

Preparation method of self-adhesive and water-stable paper straw Download PDF

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Publication number
CN113580668B
CN113580668B CN202110828750.8A CN202110828750A CN113580668B CN 113580668 B CN113580668 B CN 113580668B CN 202110828750 A CN202110828750 A CN 202110828750A CN 113580668 B CN113580668 B CN 113580668B
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paper
straw
water
biomass
adhesive
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CN113580668A (en
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李许生
董藤藤
覃程荣
陈卫
白飞天
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Guangxi University
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Guangxi University
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    • 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
    • B31D—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER, NOT PROVIDED FOR IN SUBCLASSES B31B OR B31C
    • B31D5/00—Multiple-step processes for making three-dimensional articles ; Making three-dimensional articles
    • B31D5/0095—Making drinking straws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/32—Mixtures of different inorganic impregnating agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/06—Softening or hardening of wood
    • 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
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills
    • D21D1/303—Double disc mills
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F13/00—Making discontinuous sheets of paper, pulpboard or cardboard, or of wet web, for fibreboard production
    • 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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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

The invention discloses a preparation method of a self-adhesive and water-stable paper straw, which comprises the steps of preparing paper pulp from biomass softened in a mixed water solution of nitric acid and hydrogen peroxide, preparing the paper pulp into wet paper sheets, cutting the wet paper sheets into rectangular or square paper sheets, rolling the wet paper sheets into wet paper tubes, and air-drying; and (3) carrying out heat treatment on the air-dried paper tube to vitrify the residual lignin, and manufacturing the paper straw. The paper straw prepared by the method disclosed by the invention is soaked in water for more than 2 weeks, the structure of the paper straw is not collapsed, and the paper straw is completely degraded within two months after being buried in moist soil. The method has simple process, the adopted chemical reagent is easy to obtain and low in cost, the prepared paper straw has high water stability and natural degradability, and the paper straw is self-adhesive and formed, has no chemical addition, is green and safe, and has wide application prospect in the fields of middle-high-end drinks, catering and the like.

Description

Preparation method of self-adhesive and water-stable paper straw
Technical Field
The invention belongs to the technical field of green straws, and particularly relates to a preparation method of a self-adhesive and water-stable paper straw.
Background
The straw is a disposable dining tool which is used in a large amount and is widely applied to beverages, milk tea, restaurants and even household life. The disposable plastic straw is used in a large amount due to the factors of low price, stable performance and the like, however, the disposable plastic straw is not easy to recycle due to the characteristics of light weight, small volume and the like, and can be naturally degraded after being placed in a natural environment for hundreds of years. Research shows that plastic products can not be completely degraded and can only be decomposed into small molecules, and the small molecules are gradually accumulated in an environment where people live, and even flow from land to sea, so that the health of human beings and other organisms is threatened. On the other hand, with the rapid development of economy and the continuous change of human life, the consumption of middle-high-end drinks such as milk tea and the like and the use amount of disposable straws are rapidly increased. If not controlled, a large number of disposable plastic products will build up on the earth after several years, with increasing hazards. Therefore, the development of an all green straw is not only necessary but also urgent.
Biomass resources are a well-known, widely-distributed, vast number of renewable green resources. Based on the above characteristics, a large amount of resources can be obtained from biomass and utilized. For example, it is currently most widely used to extract fibers from wood and make them into products such as household paper, cultural paper, packaging paper, paper tableware, paper straw, and the like. The method for obtaining the cellulose material from the biomass has the advantages of wide resource source, low cost, environmental friendliness, mass production and the like, and can be used for developing paper straw. However, paper drinking straws currently on the market still face a number of challenges: (1) poor water stability, fiber falling off, structural disintegration, fiber sticking, influence on drink quality and the like. (2) The glue is used for bonding, so that the potential safety hazards such as peculiar smell or glue dissolution exist.
In order to solve the above-mentioned problems of paper drinking straws, a great deal of research has been conducted by the scholars, such as polyethylene plastic films, adding waterproofing agents and coatings, etc., which not only increase the cost, but also may present a potential risk.
Disclosure of Invention
The invention provides a preparation method of a self-adhesive and water-stable paper straw, which comprises the steps of preparing paper pulp from biomass softened in a mixed water solution of nitric acid and hydrogen peroxide, preparing the paper pulp into wet paper sheets, cutting the wet paper sheets into rectangular or square paper sheets, rolling the wet paper sheets into wet paper tubes, and air-drying; and (3) carrying out heat treatment on the air-dried paper tube to vitrify the residual lignin, and manufacturing the paper straw.
The technical problems solved by the invention are as follows:
(1) Lignin is a natural hydrophobizing agent and binder which can theoretically improve the water stability of biomass materials. However, lignin-containing products such as unbleached pulp and Alkaline Peroxide Mechanical Pulp (APMP) do not exhibit very good water stability, probably due to the fact that no good bond is formed between hydrophilic cellulose and hydrophobic lignin, resulting in weak bonding forces between the interiors of the materials. The invention uses nitric acid and hydrogen peroxide water solution to soften and pretreat biomass material, and then carries out mechanical treatment to prepare paper pulp. In the pretreatment process, lignin is partially removed, and cellulose is more exposed; while lignin remaining in the biomass is oxidized, hydrophilicity is enhanced, so that the combination between the lignin and cellulose is tighter, which is beneficial to the stability of the lignin in water. The action of hydrogen peroxide also includes re-oxidizing nitrous acid, a reduction product of nitric acid, to nitric acid, maintaining the concentration of nitric acid in the system while reducing nitrogen dioxide gas emissions. Because part of lignin is reserved in the treatment process, the lignin plays roles of a hydrophobic agent and an adhesive in the material, better combination among fibers is promoted, and the fibers are better bonded and fixed, so that the fibers are not easy to fall off, and the problems of falling off of the fibers, sticking of the paper suction tube in the current market and the like can be solved.
(2) Factors of the stability of the paper straw in water include effective bonding area in addition to bonding strength per unit area. The fiber network composed of pure crude fibers has structural defects, and has small effective bonding area among the fibers, large gaps and weak bonding. The invention uses a pulping machine to grind and pulp so as to fibrillate the fiber and increase the content of fine fiber in pulping. The fibrillated fine fibers can fully fill the gaps of the fiber network, and the effective bonding area among the fibers is further increased by the filling action of lignin, so that the fibers are densified, the water molecule channels are reduced, and the water stability of the fiber material is effectively improved.
(3) Lignin can be solidified by glass transition at high temperature, so that the stability of the paper straw is strengthened. The invention further adopts heat treatment to the paper straw to soften lignin and complete glass transition, and the lignin is tightly filled between cellulose, so that the adhesion force of the lignin between the cellulose is enhanced, the hydrophobicity and the firmness of the paper straw are improved, the water stability of the paper straw is endowed, and the problem of disintegration of the paper straw structure is solved.
The invention relates to a self-adhesive formed paper straw with stability in water environment or water, which is prepared by the following steps: (1) Soaking biomass in a nitric acid aqueous solution with the mass concentration of 10%, adding hydrogen peroxide according to the mass ratio of the hydrogen peroxide to the biomass of 9% -15%, and softening for 1-3 days; (2) Filtering out the softened biomass, cleaning, adding water to adjust the mass concentration of the biomass to 10%, and pulping by a disc refiner to prepare paper pulp; (3) Taking a proper amount of paper pulp, adding water to prepare a suspension with the mass concentration of 0.6%, and preparing wet paper by using a paper sheet former; (4) Cutting square wet paper with certain size, rolling into wet paper tube, and air drying; (5) The air-dried paper tube was treated at 150℃for 6 hours to produce a self-adhesive and water-stable paper straw.
Wherein, the process for preparing the paper pulp in the step (2) comprises the following steps: the treatment was performed once at disc pitches of 0.5mm, 0.2mm and 0.05mm, respectively, using a disc refiner.
The biomass of the present invention includes, but is not limited to, pine strips, bamboo strips, eucalyptus strips.
Compared with the existing research, the invention has the following beneficial effects:
(1) The biomass raw materials used by the invention have wide sources and abundant reserves, and even can fully utilize agriculture and forestry wastes.
(2) The paper straw manufactured by the invention can be completely degraded in wet soil within two months.
(3) The paper straw prepared by the invention is self-adhesive molded, has no chemical adhesive, and is green and safe.
(4) The paper straw disclosed by the invention is simple in preparation process, mild in condition, easy to obtain and low in cost, and suitable for large-scale production.
(5) The paper straw prepared by the invention has excellent water stability and wide application prospect in the field of middle-high-end drinks and catering.
Detailed Description
The invention will be further illustrated with reference to specific examples. It should be understood that the following examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present invention, and such equivalents are intended to fall within the scope of the claims appended hereto.
Example 1
600g of pine strips, 8000mL of 10% nitric acid aqueous solution and 240g of 30% hydrogen peroxide aqueous solution are placed in a brown glass container together, and intermittent mechanical stirring is carried out for 48 hours, so as to obtain softened biomass; taking out, filtering, cleaning, adding water to adjust the mass concentration of biomass to 10%, and processing with a disc refiner at disc pitches of 0.5mm, 0.2mm and 0.05mm respectively to obtain pulp; 2.5g of paper pulp is taken, water is added to adjust the mass concentration to 0.6%, and a paper sheet former is used for filtering and forming to obtain wet paper with the diameter of 22 cm; cutting wet paper into square, rolling into wet paper tube with PET rod, and air drying; the air-dried paper tube is placed in a baking oven at 150 ℃ for 6 hours to prepare the self-adhesive and water-stable paper straw.
Example 2
1000g of bamboo strips, 8000mL of 10% nitric acid aqueous solution and 300g of 30% hydrogen peroxide aqueous solution are placed in a glass container together, and intermittent mechanical stirring is carried out for 72 hours, so as to obtain softened biomass; taking out, filtering, cleaning, adding water to adjust the mass concentration of biomass to 10%, and processing with a disc refiner at disc pitches of 0.5mm, 0.2mm and 0.05mm respectively to obtain pulp; 2.5g of paper pulp is taken, water is added to adjust the mass concentration to 0.6%, and a paper sheet former is used for filtering and forming to obtain wet paper with the diameter of 22 cm; cutting wet paper into square, rolling into wet paper tube with PET rod, and air drying; the air-dried paper tube is placed in a baking oven at 150 ℃ for 6 hours to prepare the self-adhesive and water-stable paper straw.
Example 3
Placing 200g of eucalyptus strips, 5000mL of 10% nitric acid aqueous solution and 100g of 30% hydrogen peroxide aqueous solution together in a brown glass container, and intermittently mechanically stirring for 24 hours to obtain softened biomass; taking out, filtering, cleaning, adding water to adjust the mass concentration of biomass to 10%, and processing with a disc refiner at disc pitches of 0.5mm, 0.2mm and 0.05mm respectively to obtain pulp; 2.5g of paper pulp is taken, water is added to adjust the mass concentration to 0.6%, and a paper sheet former is used for filtering and forming to obtain wet paper with the diameter of 22 cm; cutting wet paper into square, rolling into wet paper tube with PET rod, and air drying; the air-dried paper tube is placed in a baking oven at 150 ℃ for 6 hours to prepare the self-adhesive and water-stable paper straw.
Example 4
After immersing the paper pipettes of examples 1-3 in water for 2 weeks, respectively, the paper pipettes were removed and naturally dried, and the structural integrity was preserved as compared with the paper pipettes which were not immersed. The paper pipettes obtained in examples 1 to 3 were buried in moist soil in the presence of termites, respectively, for one week and then completely digested by the termites. The paper pipettes obtained in examples 1-3 were fully degraded after two months of landfill in moist soil, respectively.

Claims (1)

1. The preparation method of the self-adhesive and water-stable paper straw is characterized by comprising the following operation steps:
(1) Soaking biomass in a nitric acid aqueous solution with the mass concentration of 10%, adding hydrogen peroxide according to the mass ratio of the hydrogen peroxide to the biomass of 9% -15%, and softening for 1-3 days;
(2) Filtering out the softened biomass, cleaning, adding water to adjust the mass concentration of the biomass to 10%, and pulping by a disc refiner to prepare paper pulp;
(3) Taking a proper amount of paper pulp, adding water to prepare a suspension with the mass concentration of 0.6%, and preparing wet paper by using a paper sheet former;
(4) Cutting square wet paper with certain size, rolling into wet paper tube, and air drying;
(5) Treating the air-dried paper tube at 150 ℃ for 6 hours to prepare a self-adhesive and water-stable paper straw;
the process for preparing the paper pulp in the step (2) comprises the following steps: the treatment was performed once at disc pitches of 0.5mm, 0.2mm and 0.05mm, respectively, using a disc refiner.
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CN114407162B (en) * 2022-01-25 2023-02-24 东北林业大学 Preparation method of bakelite-free straw
CN114407161B (en) * 2022-01-25 2023-03-24 东北林业大学 Method for preparing wooden straw by using edible chitosan water-based adhesive

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Publication number Priority date Publication date Assignee Title
JP2004339648A (en) * 2003-05-16 2004-12-02 Sk Kaken Co Ltd Modified porous vegetable fiber body and method for producing the same
CN101649570A (en) * 2009-09-01 2010-02-17 陕西科技大学 Process for preparing wheatgrass cellulose with low pollution
CN106906573A (en) * 2012-01-04 2017-06-30 宝洁公司 The fibre structure containing active material in the multiple regions with different densities

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