CN110577658A - Low-shrinkage degradable plastic film and preparation method thereof - Google Patents
Low-shrinkage degradable plastic film and preparation method thereof Download PDFInfo
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- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
Abstract
The invention relates to the field of plastic films, and discloses a low-shrinkage degradable plastic film and a preparation method thereof. The preparation method comprises the following preparation processes: (1) preparing broken filamentous bacterial cellulose; (2) uniformly precipitating calcium silicate containing pore-forming agent on the surface of the broken filamentous bacterial cellulose to obtain modified bacterial cellulose; (3) heating the modified bacterial cellulose to prepare modified bacterial cellulose with porous surface; (4) preparing modified bacterial cellulose treated by a silane coupling agent; (5) mixing with compatilizer and matrix resin, melting, extruding, rolling and stretching to obtain the low-shrinkage degradable plastic film. In the degradable plastic film prepared by the invention, the modified filamentous bacterial cellulose is coated by the porous calcium silicate, so that the self-performance of the bacterial cellulose is effectively ensured, the dispersibility in a plastic matrix is improved, the molding shrinkage rate of an extruded product is reduced, the mechanical property of the composite film is improved, and the degradable plastic film has good biodegradability.
Description
Technical Field
The invention relates to the field of plastic films, and discloses a low-shrinkage degradable plastic film and a preparation method thereof.
background
The plastic products generally have the defect of difficult decomposition, and particularly, the disposable plastic products are discarded at will, thus having great harm to the environment. Therefore, degradable plastic products, including degradable films, have the functions and characteristics of traditional plastics, and can be split and degraded in natural environment through the action of microorganisms in soil and water or the action of ultraviolet rays in sunlight after the service life is reached, and finally enter ecological environment again in a reduction form to return to nature, so that people pay attention to the degradable plastic products.
At present, degradable films have covered photodegradation, photobiodegradation, photooxidative biodegradation, high starch content type biodegradation, high calcium carbonate filled type photooxidative degradation, full biodegradation, and the like. Among them, a degradable film by adding a biodegradable filler is widely spotlighted for use. In recent years, the molecular structure of bacterial cellulose is similar to that of plant cellulose, has unique properties superior to those of plant cellulose, such as high tensile strength, high porosity, nanofiber-like structure and the like, and is increasingly applied as a degradable plastic filler.
The novel green environment-friendly composite material is formed by compounding the regenerated plant fiber of the bacterial cellulose and the high polymer resin through a special process, has similar performance to that of common thermoplastic plastics, is suitable for processing various plastics, and has the advantages of being green, environment-friendly, excellent in performance, safe, non-toxic and the like. Such as polypropylene, but the molding shrinkage of polypropylene articles is large; in the research of the preparation technology of degradable plastics, aiming at the condition that bacterial cellulose and plastics are incompatible materials, some technical measures have been developed at present to change the compatibility of the bacterial cellulose and the plastics, such as alkali liquor leaching, coupling, grafting modification, steam explosion and the like, and certain effect has been achieved.
the Chinese patent application No. 201510646381.5 discloses a polypropylene/bacterial cellulose composite material and a preparation method thereof, wherein the polypropylene/bacterial cellulose composite material comprises the following components in percentage by weight: 97-99.5 wt% of polypropylene homopolymer and 0.5-3 wt% of esterified modified bacterial cellulose powder. The invention also provides a preparation method of the composite material, which comprises the steps of mixing the polypropylene homopolymer and the esterified modified bacterial cellulose powder, and carrying out melt blending extrusion, belt casting, granulation and injection molding on the mixture at the temperature of 170-200 ℃ by using a double-screw extruder to obtain the composite material. According to the invention, the polypropylene homopolymer and the esterification modified bacterial cellulose powder are blended through the double-screw extruder, so that the bacterial cellulose powder can be uniformly dispersed in the polypropylene homopolymer matrix, and the mechanical property of the obtained composite material is improved.
The Chinese invention patent application No. 201710789965.7 discloses a preparation method of a bacterial cellulose/PVA biodegradable composite plastic film, which comprises the steps of fully crushing bacterial cellulose, adding a small amount of distilled water for dilution and stirring to obtain BC serous fluid, and blending the BC serous fluid with a prepared PVA aqueous solution for a period of time in a water bath at 90 ℃; and (2) putting a certain amount of starch and a small amount of distilled water into a three-neck flask, gelatinizing under the same condition, blending with the PVA system for 30min, adding a certain amount of plasticizer, continuously reacting for 45-60 min, carrying out vacuum defoaming, and carrying out tape casting on a flat plate to form a film. The bacterial cellulose/PVA composite plastic film prepared by the method has excellent mechanical properties.
according to the above, in the existing scheme, the added bacterial cellulose is used as a modification method for preparing the degradable plastic, so that inherent properties of the plastic are easily damaged, heat resistance is deteriorated, and a plastic product is easily shrunk, thereby affecting the application range of the plastic.
Disclosure of Invention
In the existing widely-applied degradable plastics, the added biomass material bacterial cellulose has the defects of poor compatibility with a resin matrix and poor heat resistance and is easy to shrink, and the conventional modification process is easy to destroy the performance of the biomass material, so that the application of the bacterial cellulose in the degradable plastics is restricted. Therefore, the invention provides a low-shrinkage degradable plastic film and a preparation method thereof, which can effectively solve the technical problems.
In order to solve the problems, the invention adopts the following technical scheme:
A preparation method of a low-shrinkage degradable plastic film comprises the following specific steps:
(1) Firstly, mechanically crushing bacterial cellulose into filaments, and then removing impurities to obtain crushed filamentous bacterial cellulose which is sieved by a 100-mesh sieve;
(2) firstly, spraying a sodium silicate solution and a calcium salt solution on the surface of the broken filamentous bacterial cellulose prepared in the step (1) for reaction, then spraying an aqueous dispersion of a refined naphthalene pore-forming agent in the reaction process, continuing the reaction to uniformly precipitate a layer of calcium silicate containing the pore-forming agent on the surface of the bacterial cellulose, and then performing sedimentation separation and filtration to obtain modified bacterial cellulose;
(3) Heating and drying the modified bacterial cellulose prepared in the step (2), and further heating to 145-150 ℃ to sublimate the pore-forming agent to prepare modified bacterial cellulose with porous surface;
(4) fully mixing and stirring modified bacterial cellulose and a vinyl silane coupling agent to obtain modified bacterial cellulose treated by the silane coupling agent;
(5) And (3) taking maleic anhydride grafted polyethylene as a compatilizer, mixing the modified bacterial cellulose treated by the silane coupling agent obtained in the step (4) with matrix resin, then performing melt extrusion at the temperature of 160-180 ℃ through a double-screw extruder, and performing calendering and stretching through a calender to obtain the low-shrinkage degradable plastic film.
Bacterial cellulose and natural cellulose produced by plants or seaweeds have the same molecular building blocks, but bacterial cellulose fibers have many unique properties. Compared with plant cellulose, the bacterial cellulose has no associated products such as lignin, pectin, hemicellulose and the like, and has high crystallinity (up to 95 percent and 65 percent of plant cellulose) and high degree of polymerization (DP value is 2000-8000); a hyperfine network structure: the bacterial cellulose fiber is a fiber bundle with the thickness of 40-60 nanometers and is formed by combining microfibers with the diameter of 3-4 nanometers, and the fibers are mutually interwoven to form a developed hyperfine network structure; the elastic modulus of the bacterial cellulose is several times to more than ten times of that of common plant fiber, and the tensile strength is high; the bacterial cellulose has high biocompatibility, adaptability and biodegradability.
Preferably, the bacterial cellulose in the step (1) is a porous reticular nano-scale biopolymer synthesized by fermenting bacterial microorganisms, and at least one of cellulose of acetobacter, cellulose of agrobacterium, cellulose of rhizobium and cellulose of sarcina is selected.
preferably, the mass concentration of the sodium silicate solution in the step (2) is 20-30%.
Preferably, the calcium salt solution in the step (2) is at least one of a calcium chloride solution and a calcium nitrate solution with a mass concentration of 5-10%.
Preferably, the mass concentration of the aqueous dispersion of the refined naphthalene pore-forming agent in the step (2) is 10-20%. The fine naphthalene is fine water insoluble crystal grains, is dispersed in water for convenient spraying, and is dispersed in a calcium silicate precipitation layer difficultly after final filtration so as to promote the calcium silicate to form micropores at subsequent high temperature.
Preferably, in step (2): 16-20 parts of sodium silicate solution, 22-25 parts of calcium salt solution, 38-48 parts of broken filamentous bacterial cellulose and 3-5 parts of water dispersion of refined naphthalene pore-forming agent.
preferably, the vinyl silane coupling agent in the step (4) is at least one of vinyl trichlorosilane, vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri-tert-butoxy silane and vinyl triacetoxy silane.
preferably, in step (4): 35-45 parts of modified bacterial cellulose and 4-6 parts of vinyl silane coupling agent.
preferably, in step (5): 8-14 parts of maleic anhydride grafted polyethylene, 10-20 parts of modified bacterial cellulose treated by a silane coupling agent, and 66-82 parts of matrix resin. Wherein the matrix resin is selected from one of polyethylene and polypropylene.
The invention further provides a low-shrinkage degradable plastic film prepared by the method, the bacterial cellulose is crushed into threads, impurities are removed for standby, a sodium silicate solution and a calcium salt solution are sprayed and deposited on the surface of the crushed thread-shaped bacterial cellulose, an aqueous dispersion of a refined naphthalene pore-forming agent is sprayed in the reaction process, after the reaction is finished, a layer of calcium silicate containing the pore-forming agent is uniformly deposited on the surface of the bacterial cellulose, and the modified bacterial cellulose is filtered through sedimentation separation; heating and drying, and further subliming the pore-forming agent to obtain modified bacterial cellulose with porous surface; then, treating the modified bacterial cellulose by adopting a vinyl silane coupling agent; and then, mixing maleic anhydride grafted polyethylene serving as a compatilizer with matrix resin, performing melt extrusion through a double-screw extruder, and performing calendering and stretching to form a film through a calender.
the invention provides a low-shrinkage degradable plastic film and a preparation method thereof, and compared with the prior art, the low-shrinkage degradable plastic film has the outstanding characteristics and excellent effects that:
1. Provides a method for preparing a low-shrinkage degradable plastic film by using porous calcium silicate coated filamentous bacterial cellulose as a raw material.
2. By adding pore-forming agent and carrying out precipitation reaction, a porous calcium silicate coating layer is formed on the surface of filamentous bacterial cellulose, the inorganic coating layer can effectively protect the bacterial cellulose, the degradation during hot processing is avoided, the performance of the bacterial cellulose is retained to the maximum extent, and meanwhile, the thermal shrinkage of the bacterial cellulose in plastic is reduced due to the protection of silicic acid fiber.
3. the filamentous bacterial cellulose coated with the porous calcium silicate is prepared, and the surface is in the calcium silicate shape, and the pores are formed on the surface, so that the bonding strength with a resin matrix can be effectively improved, and the molding shrinkage rate of an extruded product is reduced.
4. the preparation process is simple, the compatibility of the bacterial cellulose is easily modified, and the dispersibility of the bacterial cellulose in a plastic matrix is favorably improved, so that the mechanical property of the composite film is effectively improved.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) firstly, mechanically crushing bacterial cellulose into filaments, and then removing impurities to obtain the crushed filamentous bacterial cellulose which is sieved by a 00-mesh sieve; the bacterial cellulose is cellulose of Acetobacter;
(2) firstly, spraying a sodium silicate solution and a calcium salt solution on the surface of the broken filamentous bacterial cellulose prepared in the step (1) for reaction, then spraying an aqueous dispersion of a refined naphthalene pore-forming agent in the reaction process, continuing the reaction to uniformly precipitate a layer of calcium silicate containing the pore-forming agent on the surface of the bacterial cellulose, and then performing sedimentation separation and filtration to obtain modified bacterial cellulose; the mass concentration of the sodium silicate solution is 26 percent; the calcium salt solution is a calcium chloride solution with the mass concentration of 7 percent; the mass concentration of the water dispersion of the refined naphthalene pore-forming agent is 14 percent;
Wherein: 17 parts of sodium silicate solution, 24 parts of calcium salt solution, 44 parts of broken thread-shaped bacterial cellulose and 5 parts of water dispersion of refined naphthalene pore-forming agent;
(3) Heating and drying the modified bacterial cellulose prepared in the step (2), and further heating to 147 ℃ to sublimate the pore-forming agent to prepare modified bacterial cellulose with porous surface;
(4) fully mixing and stirring modified bacterial cellulose and a vinyl silane coupling agent to obtain modified bacterial cellulose treated by the silane coupling agent; the vinyl silane coupling agent is vinyl trichlorosilane;
Wherein: 39 parts of modified bacterial cellulose and 5 parts of vinyl silane coupling agent;
(5) Taking maleic anhydride grafted polyethylene 900E as a compatilizer, mixing the modified bacterial cellulose treated by the silane coupling agent obtained in the step (4) with LLDPE7042 matrix resin, then performing melt extrusion at 165 ℃ through a double-screw extruder, and performing calendering and stretching film forming through a four-roll calender to obtain a low-shrinkage degradable plastic film with the thickness of 0.1 mm;
wherein: 10 parts of maleic anhydride grafted polyethylene, 15 parts of modified bacterial cellulose treated by a silane coupling agent and 75 parts of LLDPE7042 matrix resin.
example 2
(1) firstly, mechanically crushing bacterial cellulose into filaments, and then removing impurities to obtain crushed filamentous bacterial cellulose which is sieved by a 100-mesh sieve; the bacterial cellulose is Agrobacterium cellulose;
(2) Firstly, spraying a sodium silicate solution and a calcium salt solution on the surface of the broken filamentous bacterial cellulose prepared in the step (1) for reaction, then spraying an aqueous dispersion of a refined naphthalene pore-forming agent in the reaction process, continuing the reaction to uniformly precipitate a layer of calcium silicate containing the pore-forming agent on the surface of the bacterial cellulose, and then performing sedimentation separation and filtration to obtain modified bacterial cellulose; the mass concentration of the sodium silicate solution is 22 percent; the calcium salt solution is a calcium nitrate solution with the mass concentration of 6 percent; the mass concentration of the water dispersion of the refined naphthalene pore-forming agent is 12 percent;
Wherein: 17 parts of sodium silicate solution, 23 parts of calcium salt solution, 45 parts of broken thread-shaped bacterial cellulose and 4 parts of water dispersion of refined naphthalene pore-forming agent;
(3) Heating and drying the modified bacterial cellulose prepared in the step (2), and further heating to 146 ℃ to sublimate the pore-forming agent to prepare modified bacterial cellulose with porous surface;
(4) Fully mixing and stirring modified bacterial cellulose and a vinyl silane coupling agent to obtain modified bacterial cellulose treated by the silane coupling agent; the vinyl silane coupling agent is vinyl trimethoxy silane;
wherein: 37 parts of modified bacterial cellulose and 5 parts of vinyl silane coupling agent;
(5) taking maleic anhydride grafted polyethylene as a compatilizer, mixing the modified bacterial cellulose treated by the silane coupling agent obtained in the step (4) with LLDPE7042 matrix resin, then performing melt extrusion at the temperature of 170 ℃ through a double-screw extruder, and performing calendering and stretching film forming through a four-roll calender to obtain a low-shrinkage degradable plastic film with the thickness of 0.1 mm;
wherein: 9 parts of maleic anhydride grafted polyethylene, 12 parts of modified bacterial cellulose treated by a silane coupling agent and 79 parts of LLDPE7042 matrix resin.
Example 3
(1) firstly, mechanically crushing bacterial cellulose into filaments, and then removing impurities to obtain crushed filamentous bacterial cellulose which is sieved by a 100-mesh sieve; the bacterial cellulose is Rhizobium cellulose;
(2) Firstly, spraying a sodium silicate solution and a calcium salt solution on the surface of the broken filamentous bacterial cellulose prepared in the step (1) for reaction, then spraying an aqueous dispersion of a refined naphthalene pore-forming agent in the reaction process, continuing the reaction to uniformly precipitate a layer of calcium silicate containing the pore-forming agent on the surface of the bacterial cellulose, and then performing sedimentation separation and filtration to obtain modified bacterial cellulose; the mass concentration of the sodium silicate solution is 28 percent; the calcium salt solution is a calcium chloride solution with the mass concentration of 9%; the mass concentration of the water dispersion of the refined naphthalene pore-forming agent is 18 percent;
Wherein: 19 parts of sodium silicate solution, 24 parts of calcium salt solution, 41 parts of broken thread-shaped bacterial cellulose and 5 parts of water dispersion of refined naphthalene pore-forming agent;
(3) Heating and drying the modified bacterial cellulose prepared in the step (2), further heating to 149 ℃, and subliming a pore-forming agent to prepare modified bacterial cellulose with porous surface;
(4) fully mixing and stirring modified bacterial cellulose and a vinyl silane coupling agent to obtain modified bacterial cellulose treated by the silane coupling agent; the vinyl silane coupling agent is vinyl triethoxysilane;
Wherein: 42 parts of modified bacterial cellulose and 6 parts of vinyl silane coupling agent;
(5) taking maleic anhydride grafted polyethylene as a compatilizer, mixing the modified bacterial cellulose treated by the silane coupling agent obtained in the step (4) with LLDPE7042 matrix resin, then performing melt extrusion at 160 ℃ through a double-screw extruder, and performing calendering and stretching film forming through a four-roll calender to obtain a low-shrinkage degradable plastic film with the thickness of 0.1 mmd;
wherein: 12 parts of maleic anhydride grafted polyethylene, 17 parts of modified bacterial cellulose treated by a silane coupling agent and 71 parts of LLDPE7042 matrix resin.
example 4
(1) firstly, mechanically crushing bacterial cellulose into filaments, and then removing impurities to obtain crushed filamentous bacterial cellulose which is sieved by a 100-mesh sieve; the bacterial cellulose is sarcina cellulose;
(2) Firstly, spraying a sodium silicate solution and a calcium salt solution on the surface of the broken filamentous bacterial cellulose prepared in the step (1) for reaction, then spraying an aqueous dispersion of a refined naphthalene pore-forming agent in the reaction process, continuing the reaction to uniformly precipitate a layer of calcium silicate containing the pore-forming agent on the surface of the bacterial cellulose, and then performing sedimentation separation and filtration to obtain modified bacterial cellulose; the mass concentration of the sodium silicate solution is 30 percent; the calcium salt solution is a calcium chloride solution with the mass concentration of 10 percent; the mass concentration of the water dispersion of the refined naphthalene pore-forming agent is 20 percent;
wherein: 20 parts of sodium silicate solution, 25 parts of calcium salt solution, 38 parts of broken thread-shaped bacterial cellulose and 3 parts of water dispersion of refined naphthalene pore-forming agent;
(3) Heating and drying the modified bacterial cellulose prepared in the step (2), and further heating to 150 ℃ to sublimate the pore-forming agent to prepare modified bacterial cellulose with porous surface;
(4) fully mixing and stirring modified bacterial cellulose and a vinyl silane coupling agent to obtain modified bacterial cellulose treated by the silane coupling agent; the vinyl silane coupling agent is vinyl tri-tert-butoxy silane;
Wherein: 45 parts of modified bacterial cellulose and 6 parts of vinyl silane coupling agent;
(5) Taking maleic anhydride grafted polyethylene as a compatilizer, mixing the modified bacterial cellulose treated by the silane coupling agent obtained in the step (4) with LLDPE7042 matrix resin, then performing melt extrusion at 160 ℃ through a double-screw extruder, and performing calendering and stretching film forming through a calender to obtain a low-shrinkage degradable plastic film with the thickness of 0.1 mm;
Wherein: 14 parts of maleic anhydride grafted polyethylene, 20 parts of modified bacterial cellulose treated by a silane coupling agent and 66 parts of LLDPE7042 matrix resin.
comparative example 1
Comparative example 1 in which no pore-forming agent was added and no calcium silicate was coated, the same conditions as in example 4 were applied to obtain a degradable plastic film having heat resistance and heat shrinkability as shown in Table 1.
comparative example 2
comparative example 2 in which no pore-forming agent was added, the degradable plastic film obtained under the same conditions as in example 4 was shown in Table 1 in the heat resistance and heat shrinkability of the film.
comparative example 3
Comparative example 3 is a plastic film with a thickness of 0.1mm, which is prepared by melt-extruding LLDPE7042 through a twin-screw extruder at a temperature of 160 ℃, calendering by a calender and stretching into a film, and is used as a blank comparative sample.
The performance index testing method comprises the following steps:
(1) Heat resistance: in order to facilitate qualitative analysis test, the matrix resins of examples 1-4 and comparative examples 1-3 are all conventional film-grade resin LLDPE7042, samples of the examples and comparative examples are respectively cut by 15cm multiplied by 15cm and are tightly attached to the surface of a stainless steel plate with the thickness of 1mm, the other surface of the stainless steel is baked by an alcohol lamp until the film is wound, and the temperature of the stainless steel surface is tested to measure the heat resistance of the film.
(2) Molding shrinkage rate: the films of examples 1 to 4 and comparative examples 1 to 3 were cut into 15cm × 15cm, then stacked in groups of 10 sheets, hot-press-compounded in a 120 ℃ flat plate machine, 1 hour after the mold release, the side length of the test specimen was L1, the cavity length was L0, and the molding shrinkage was calculated according to the formula: s ═ L0-L1)/L0 × 100%.
(3) tensile break strength is tested with reference to QB/T1040.
Table 1:
through qualitative comparison test of the film, after the bacterial cellulose is treated, the mechanical strength of the degradable plastic film prepared by the invention is close to that of a blank 7042 film, and the formed shrinkage aluminum is obviously reduced. Comparative example 1 no pore-forming agent and coated calcium silicate were added, which affected the dispersion and compatibility of the bacterial cellulose, reduced strength, poor heat resistance, and greater heat shrinkage.
Claims (10)
1. A preparation method of a low-shrinkage degradable plastic film is characterized by comprising the following specific steps:
(1) firstly, mechanically crushing bacterial cellulose into filaments, and then removing impurities to obtain crushed filamentous bacterial cellulose which is sieved by a 100-mesh sieve;
(2) Firstly, spraying a sodium silicate solution and a calcium salt solution on the surface of the broken filamentous bacterial cellulose prepared in the step (1) for reaction, then spraying an aqueous dispersion of a refined naphthalene pore-forming agent in the reaction process, continuing the reaction to uniformly precipitate a layer of calcium silicate containing the pore-forming agent on the surface of the bacterial cellulose, and then performing sedimentation separation and filtration to obtain modified bacterial cellulose;
(3) Heating and drying the modified bacterial cellulose prepared in the step (2), and further heating to 145-150 ℃ to sublimate the pore-forming agent to prepare modified bacterial cellulose with porous surface;
(4) fully mixing and stirring modified bacterial cellulose and a vinyl silane coupling agent to obtain modified bacterial cellulose treated by the silane coupling agent;
(5) And (3) taking maleic anhydride grafted polyethylene as a compatilizer, mixing the modified bacterial cellulose treated by the silane coupling agent obtained in the step (4) with matrix resin, then performing melt extrusion at the temperature of 160-180 ℃ through a double-screw extruder, and performing calendering and stretching through a calender to obtain the low-shrinkage degradable plastic film.
2. The method for preparing a low-shrinkage degradable plastic film according to claim 1, wherein the method comprises the following steps: the bacterial cellulose in the step (1) is at least one of cellulose of acetobacter, cellulose of agrobacterium, cellulose of rhizobium and cellulose of sarcina.
3. The method for preparing a low-shrinkage degradable plastic film according to claim 1, wherein the method comprises the following steps: and (3) the mass concentration of the sodium silicate solution in the step (2) is 20-30%.
4. the method for preparing a low-shrinkage degradable plastic film according to claim 1, wherein the method comprises the following steps: and (3) the calcium salt solution in the step (2) is at least one of a calcium chloride solution and a calcium nitrate solution with the mass concentration of 5-10%.
5. the method for preparing a low-shrinkage degradable plastic film according to claim 1, wherein the method comprises the following steps: and (3) the mass concentration of the water dispersion of the refined naphthalene pore-forming agent in the step (2) is 10-20%.
6. the method for preparing a low-shrinkage degradable plastic film according to claim 1, wherein the method comprises the following steps: in the step (2): 16-20 parts of sodium silicate solution, 22-25 parts of calcium salt solution, 38-48 parts of broken filamentous bacterial cellulose and 3-5 parts of water dispersion of refined naphthalene pore-forming agent.
7. The method for preparing a low-shrinkage degradable plastic film according to claim 1, wherein the method comprises the following steps: the vinyl silane coupling agent in the step (4) is at least one of vinyl trichlorosilane, vinyl trimethoxy silane, vinyl triethoxy silane, vinyl tri-tert-butoxy silane and vinyl triacetoxy silane.
8. the method for preparing a low-shrinkage degradable plastic film according to claim 1, wherein the method comprises the following steps: in the step (4): 35-45 parts of modified bacterial cellulose and 4-6 parts of vinyl silane coupling agent.
9. The method for preparing a low-shrinkage degradable plastic film according to claim 1, wherein the method comprises the following steps: in the step (5): 8-14 parts of maleic anhydride grafted polyethylene, 10-20 parts of modified bacterial cellulose treated by a silane coupling agent, and 66-82 parts of matrix resin.
10. A low shrinkage degradable plastic film prepared by the method of any one of claims 1 to 9.
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| CN114573878A (en) * | 2022-03-18 | 2022-06-03 | 潍坊潍森纤维新材料有限公司 | Preparation method and application of food-medicine grade biological cellulose transparent material |
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| US20090258172A1 (en) * | 2002-01-11 | 2009-10-15 | Bowden Joe A | Biodegradable or compostable containers |
| CN101372536A (en) * | 2008-10-15 | 2009-02-25 | 东北电力大学 | Preparation of bacteria cellulose food fresh keeping membrane |
| CN107793623A (en) * | 2017-11-24 | 2018-03-13 | 肖宇萍 | A kind of degradable composite material and preparation method thereof |
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| CN114573878A (en) * | 2022-03-18 | 2022-06-03 | 潍坊潍森纤维新材料有限公司 | Preparation method and application of food-medicine grade biological cellulose transparent material |
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