CN110359321B - Method for preparing fruit tray by nano-cellulose/PVA mixed slurry - Google Patents
Method for preparing fruit tray by nano-cellulose/PVA mixed slurry Download PDFInfo
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- CN110359321B CN110359321B CN201910536999.4A CN201910536999A CN110359321B CN 110359321 B CN110359321 B CN 110359321B CN 201910536999 A CN201910536999 A CN 201910536999A CN 110359321 B CN110359321 B CN 110359321B
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- cellulose
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- pva
- fruit tray
- mixture
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- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic compounds
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- 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
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
- D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/18—Highly hydrated, swollen or fibrillatable fibres
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- 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
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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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Polysaccharides And Polysaccharide Derivatives (AREA)
Abstract
The invention relates to a method for preparing a fruit tray by using nano cellulose/PVA mixed slurry, which comprises the steps of dispersing microcrystalline cellulose in deionized water, adding 2,2,6, 6-tetramethyl piperidine-1-oxyl and NaBr, carrying out magnetic stirring, adding NaClO once every half hour to obtain oxidized microcrystalline cellulose, washing the microcrystalline cellulose by centrifugation, and dialyzing to obtain nano cellulose; adding PVA into a mixed solvent system of dimethyl sulfoxide and deionized water, and heating in a water bath to obtain a PVA solution; mixing the nano-fiber with the PVA solution, adding the mixture into the slurry, and then carrying out vacuum filtration, hot-pressing and shaping, transferring and trimming to obtain the nano-fiber composite material. By adopting the fruit tray and the preparation method thereof, the microcrystalline cellulose is prepared into the nano-cellulose, then the nano-cellulose is mixed with the PVA material and then is added into the pulp to prepare the fruit tray, so that the fruit tray has better water resistance and physical strength, and meanwhile, the fruit tray prepared from the pulp is degradable, safe, harmless and green and environment-friendly.
Description
Technical Field
The invention relates to a method for preparing a fruit tray by using nano cellulose/PVA mixed slurry.
Background
The concept of green and environmental protection in the world is more and more important, people pay more and more attention to green safety, and all fields are advanced in the concept of green and environmental protection sustainable development. At present, most fruit trays in the market are made of plastic materials, are not only nondegradable, but also contradict the sustainable development concept. Therefore, the fiber fruit tray is invented at present, but the prepared fiber fruit tray is deficient in water resistance and physical strength, and the water resistance and physical strength of the fruit tray can be enhanced by mixing the nano-cellulose PVA material with the pulp to prepare the fruit tray. The preparation of the fruit tray prepared from the nano-cellulose PVA mixed slurry brings great convenience to the life of people and brings remarkable economic and social benefits.
Disclosure of Invention
The invention aims to provide a method for preparing a fruit tray by nano cellulose/PVA mixed slurry, which can improve the water resistance and physical strength of the fruit tray against the defects of the existing fiber fruit tray product.
The technical scheme adopted by the invention is as follows: a method for preparing a fruit tray by using nano cellulose/PVA mixed slurry is characterized by comprising the following steps:
(1) dispersing microcrystalline cellulose in deionized water, and adding 2,2,6, 6-tetramethylpiperidine-1-oxyl and NaBr into the deionized water to obtain a mixture;
(2) magnetically stirring the mixture, and simultaneously adding NaClO into the mixture every half hour and adding the NaClO for a plurality of times to obtain oxidized microcrystalline cellulose;
(3) washing the oxidized microcrystalline cellulose with the de-oxidized water by centrifugation, dialyzing, and then obtaining nanocellulose;
(4) adding 4g to 5g of PVA into a mixed solvent system of dimethyl sulfoxide and deionized water, and heating in a water bath to obtain a PVA solution for later use;
(5) adding the nano-cellulose obtained in the step (3) into the PVA solution obtained in the step (4) and mixing, and adding the obtained mixed solution into the slurry to obtain mixed slurry;
(6) and (3) conveying the mixed slurry to a forming machine, and carrying out vacuum filtration, hot-pressing and shaping, transferring and trimming to obtain the molded fruit tray product.
The method for preparing the fruit tray by using the nano cellulose/PVA mixed slurry is characterized in that the step (1) is as follows: dispersing 1.5-2% microcrystalline cellulose in 450-550 ml deionized water, and adding 90-110 mg of 2,2,6, 6-tetramethylpiperidine-1-oxyl and 100-200 ml of 1-2% NaBr.
The method for preparing the fruit tray by using the nano cellulose/PVA mixed slurry is characterized in that the step (2) is as follows: and (2) magnetically stirring the mixture obtained in the step (1) at a speed of 600-700 rpm, adding 10-12 ml of 10-15% NaClO into the mixture every half hour, maintaining the pH value at 11-12, and finishing the reaction after 3-4 hours.
The method for preparing the fruit tray by using the nano cellulose/PVA mixed slurry is characterized in that the washing frequency in the step (3) is preferably 3-5 times, and the dialysis time is preferably 60-80 h.
The method for preparing the fruit tray by using the nano-cellulose/PVA mixed slurry is characterized in that the mixed solvent system of dimethyl sulfoxide (DMSO) and deionized water in the step (4) is adopted, wherein the liquid ratio of dimethyl sulfoxide to deionized water is preferably 2: 1, and the concentration of PVA in the mixture is preferably 8-12%.
The method for preparing the fruit tray by using the nano cellulose/PVA mixed slurry is characterized in that the water bath temperature in the step (4) is preferably 80-100 ℃, and the heating time is preferably 2-4 h.
The method for preparing the fruit tray by using the nano-cellulose/PVA mixed slurry is characterized in that the solid-to-liquid ratio of the mixed solution to the drying insulation slurry in the step (5) is preferably 1: 1000.
According to the invention, the microcrystalline cellulose is prepared into the nano-cellulose and then mixed with the PVA material to obtain the mixed solution, and the mixed solution is added into the pulp to prepare the fruit tray, so that the fruit tray has better water resistance and physical strength, and meanwhile, the fruit tray prepared from the pulp is degradable, safe, harmless and green and environment-friendly.
Detailed Description
The invention is further illustrated by the following examples, but the scope of the invention as claimed is not limited to the scope of the examples.
In the embodiment, the method for preparing the fruit tray by using the nano cellulose/PVA mixed slurry comprises the following steps.
1. Dispersing 1.5-2% microcrystalline cellulose in 450-550 ml deionized water, and adding 90-110 mg of 2,2,6, 6-tetramethylpiperidine-1-oxyl (TEMPO) and 100-200 ml of 1-2% NaBr.
2. And (2) magnetically stirring the mixture obtained in the step (1) at a speed of 600-700 rpm, adding 10-12 ml of 10-15% NaClO into the mixture every half hour, maintaining the pH value at 11-12, and finishing the reaction after 3-4 hours.
3. Washing the oxidized microcrystalline cellulose with the deoxidized water by centrifugation, dialyzing for 3-5 times for 60-80 h, and then obtaining the nano cellulose.
4. Adding 4g to 5g of PVA into a mixed solvent system of dimethyl sulfoxide and deionized water, and heating in a water bath to obtain a PVA solution for later use, wherein the liquid ratio of the dimethyl sulfoxide to the deionized water is preferably 2: 1, the concentration of the PVA in the mixture is preferably 8 to 12%, the temperature of the water bath is 80 to 100 ℃, and the heating time is preferably 2 to 4 hours.
5. Adding the obtained nano-cellulose into the obtained PVA solution and further mixing, and adding the obtained mixed solution into the slurry to obtain mixed slurry; the solid-liquid ratio of the mixed liquid to the drying-insulation slurry is preferably 1: 1000.
6. And pumping the mixed slurry to a forming machine by using a pipeline, and preparing a molded fruit tray product by vacuum filtration, hot-pressing and shaping, transferring and trimming.
Claims (6)
1. A method for preparing a fruit tray by using nano cellulose/PVA mixed slurry is characterized by comprising the following steps: the method comprises the following steps:
(1) dispersing 1.5-2% microcrystalline cellulose in 450-550 ml deionized water, and adding 90-110 mg of 2,2,6, 6-tetramethylpiperidine-1-oxyl and 100-200 ml of 1-2% NaBr to obtain a mixture;
(2) magnetically stirring the mixture, and simultaneously adding NaClO into the mixture every half hour and adding the NaClO for a plurality of times to obtain oxidized microcrystalline cellulose;
(3) washing the oxidized microcrystalline cellulose with the de-oxidized water by centrifugation, dialyzing, and then obtaining nanocellulose;
(4) adding 4-5 g of PVA into a mixed solvent system of dimethyl sulfoxide and deionized water, and heating in a water bath to obtain a PVA solution for later use;
(5) adding the nano-cellulose obtained in the step (3) into the PVA solution obtained in the step (4) and mixing, and adding the obtained mixed solution into the slurry to obtain mixed slurry;
(6) and (3) conveying the mixed slurry to a forming machine, and carrying out vacuum filtration, hot-pressing and shaping, transferring and trimming to obtain the molded fruit tray product.
2. The method of claim 1, wherein: the step (2) is as follows: and (2) magnetically stirring the mixture obtained in the step (1) at a speed of 600-700 rpm, adding 10-12 ml of 10-15% NaClO into the mixture every half hour, maintaining the pH value at 11-12, and finishing the reaction after 3-4 hours.
3. The method of claim 1, wherein: the washing times in the step (3) are 3-5 times, and the dialysis time is 60-80 h.
4. The method of claim 1, wherein: the mixed solvent system of dimethyl sulfoxide and deionized water in the step (4), wherein the liquid ratio of dimethyl sulfoxide to deionized water is 2: 1, and the concentration of PVA in the mixture is 8-12%.
5. The method of claim 1, wherein: the temperature of the water bath in the step (4) is 80-100 ℃, and the heating time is 2-4 h.
6. The method of claim 1, wherein: and (5) the solid-liquid ratio of the mixed liquid to the absolute dry slurry is 1: 1000.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910536999.4A CN110359321B (en) | 2019-06-20 | 2019-06-20 | Method for preparing fruit tray by nano-cellulose/PVA mixed slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910536999.4A CN110359321B (en) | 2019-06-20 | 2019-06-20 | Method for preparing fruit tray by nano-cellulose/PVA mixed slurry |
Publications (2)
| Publication Number | Publication Date |
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| CN110359321A CN110359321A (en) | 2019-10-22 |
| CN110359321B true CN110359321B (en) | 2021-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910536999.4A Active CN110359321B (en) | 2019-06-20 | 2019-06-20 | Method for preparing fruit tray by nano-cellulose/PVA mixed slurry |
Country Status (1)
| Country | Link |
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Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06322699A (en) * | 1993-05-12 | 1994-11-22 | Utsui:Kk | Production of article formed by paper-making process |
| CN105178009A (en) * | 2015-08-07 | 2015-12-23 | 哈尔滨工业大学 | Preparation method of nanocellulose/oxidized regenerated cellulose composite hemostatic material |
| CN105175557A (en) * | 2015-08-21 | 2015-12-23 | 广西大学 | Preparation method of nano cellulose |
| CN105568730A (en) * | 2015-12-21 | 2016-05-11 | 同济大学 | Method for preparing renewable nano-celluloses |
| CN107511770B (en) * | 2017-09-29 | 2019-08-16 | 衢州学院 | A kind of melting of high temperature Asia is from adhesion abrasive grain abrasive tools preparation method |
| CN107841906A (en) * | 2017-11-02 | 2018-03-27 | 江南大学 | A kind of sludge base moulded paper pulp product and preparation method thereof |
| CN108276617B (en) * | 2018-01-12 | 2020-03-31 | 东北林业大学 | Preparation method of quaternized TEMPO oxidized nano-cellulose/curcumin/PVA/tara gum active packaging film |
| CN109629302A (en) * | 2018-11-30 | 2019-04-16 | 浙江金昌特种纸股份有限公司 | A kind of preparation method of food-grade disposable product |
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| CN110359321A (en) | 2019-10-22 |
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