CN114393897A - Novel environment-friendly biodegradable film and preparation method thereof - Google Patents
Novel environment-friendly biodegradable film and preparation method thereof Download PDFInfo
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- CN114393897A CN114393897A CN202111455949.7A CN202111455949A CN114393897A CN 114393897 A CN114393897 A CN 114393897A CN 202111455949 A CN202111455949 A CN 202111455949A CN 114393897 A CN114393897 A CN 114393897A
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- 238000002360 preparation method Methods 0.000 title claims description 10
- 239000000463 material Substances 0.000 claims abstract description 63
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 claims description 98
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 23
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 19
- 229920006221 acetate fiber Polymers 0.000 claims description 13
- 229920000229 biodegradable polyester Polymers 0.000 claims description 13
- 239000004622 biodegradable polyester Substances 0.000 claims description 13
- 229920000747 poly(lactic acid) Polymers 0.000 claims description 13
- 239000004626 polylactic acid Substances 0.000 claims description 13
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 7
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
- 239000012153 distilled water Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 235000019441 ethanol Nutrition 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 2
- 238000001291 vacuum drying Methods 0.000 claims description 2
- 238000005297 material degradation process Methods 0.000 abstract description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
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- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/716—Degradable
- B32B2307/7163—Biodegradable
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/08—Cellulose derivatives
- C08J2401/10—Esters of organic acids
- C08J2401/12—Cellulose acetate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention discloses a novel environment-friendly biodegradable film, which belongs to the technical field of material degradation and comprises a middle layer and degradable layers positioned on the upper surface and the lower surface of the middle layer; the degradable layer is bonded on the upper surface and the lower surface of the middle layer through biodegradable materials, the film is prepared from the biodegradable materials, the prepared degradable film is easy to degrade, and the pollution to the environment is avoided.
Description
Technical Field
The invention belongs to the technical field of material degradation, and particularly relates to a novel environment-friendly biodegradable film and a preparation method thereof.
Background
At present, because the degradability of the material greatly improves the environmental protection effect, the material avoids environmental pollution after being degraded, and the material is the key content of research in the technical field of new materials at present, the biodegradable material is widely used in other technical fields such as processing and manufacturing industry, agriculture and the like, and is one of the materials advocated by the state;
in the prior art, the film is widely used, and is widely used in the technical field of plastic production and processing and the technical field of agricultural production, but the film has longer degradation time after being used, and is easy to pollute the environment after being used, so the environment protection degree is not high, and the film needs to be recycled and reused regularly, thereby causing certain inconvenience to people,
therefore, the design of a novel environment-friendly biodegradable film is a technical problem which is urgently needed to be solved at present, and the biodegradable film has a wide application prospect and great social and economic benefits.
Disclosure of Invention
Aiming at the problem that the existing film is difficult to degrade, the invention provides a novel environment-friendly biodegradable film which comprises a three-layer structure, namely a bottom film layer positioned in a middle layer and degradable layers paved on the upper surface and the lower surface of the bottom film, so that the biodegradable film is convenient to degrade after being used, and the environment pollution is avoided.
In order to solve the above problems, the present invention adopts the following technical solutions.
A novel environment-friendly biodegradable film comprises an intermediate layer and degradable layers positioned on the upper surface and the lower surface of the intermediate layer; the degradable layer is bonded on the upper surface and the lower surface of the middle layer.
Preferably, the degradable layers are adhered to the upper surface and the lower surface of the middle layer through biodegradable materials, and the biodegradable materials are prepared by adding acetate fibers, biodegradable polyester and hydroxyl-terminated polylactic acid into a chloroform solution.
Preferably, the bottom film layer is a polyvinyl alcohol film.
The preparation method of the biodegradable film comprises the following steps:
preparation of S1 biodegradable material:
dissolving acetate fiber, biodegradable polyester and hydroxyl-terminated polylactic acid into chloroform at the temperature of 32-38 ℃ according to the ratio of the biodegradable material in grams to the chloroform in ml of 1: 40-60 to obtain a chloroform solution of the biodegradable material;
standing the prepared chloroform solution for 24 hours, filtering to remove insoluble substances, dripping the filtered chloroform solution into absolute ethyl alcohol under stirring, separating out a biodegradable material solid from the absolute ethyl alcohol, removing the chloroform and the ethyl alcohol on the surface of the biodegradable material solid, and drying under a vacuum condition until the weight is constant to obtain the biodegradable material;
s2, processing the bottom film layer;
mixing and dissolving polyvinyl alcohol and distilled water according to a mass ratio of 4-5: 100 to obtain a polyvinyl alcohol aqueous solution; according to the formula of 1.5-2.0X 10-2Grams polyvinyl alcohol per centimeter2In the ratio of (A) to (B)And pouring the polyvinyl alcohol aqueous solution into a film forming mould, standing at room temperature for 2-3 days, and volatilizing the solvent to the full extent to obtain the bottom film layer.
S3, dissolving the biodegradable material prepared in the step S1 in chloroform, coating adhesives on the upper surface and the lower surface of the bottom film layer prepared in the step S2, placing the bottom film layer in a mold, respectively pouring the biodegradable materials dissolved in the chloroform in the mold, and volatilizing the chloroform to enable the biodegradable material to be adhered to the bottom film layer to form the biodegradable film.
Preferably, in step S1, the mass ratio of the acetate fiber, the biodegradable polyester and the hydroxyl terminated polylactic acid is 3: 3: 4.
preferably, the vacuum drying condition in the step S1 is a temperature of 25 ℃ and a vacuum degree of 0.03 to 0.05 Pa.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
(1) the biodegradable film is prepared from the bottom film layer and the degradable layers, and the degradable layers are bonded on the upper surface and the lower surface of the bottom film layer by adopting biodegradable materials, so that the prepared degradable film is easy to degrade and can be degraded into carbon dioxide and water after being used, the pollution to soil is avoided, and the environment-friendly degree is higher;
(2) the degradable layer of the biodegradable film is adhered to the bottom film layer in an adhesion mode, the chloroform is removed by the biodegradable material through natural volatilization, and the material is adhered to the bottom film layer in an adhesive mode.
Drawings
FIG. 1 is a schematic view of the layered structure of the film of the present invention.
Wherein:
10. a base film layer;
20. a degradable layer.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
As shown in fig. 1, which is a schematic view of a layered structure of a novel environment-friendly biodegradable film according to a preferred embodiment of the present invention, the degradable film of this embodiment includes a bottom film layer 10 disposed in the middle and degradable layers 20 respectively disposed on two sides of the bottom film layer 10.
In the degradable film of the embodiment, the degradable layer 10 is bonded on the base film layer 10 through a biodegradable material to form a degradable film;
the biodegradable material is prepared by adding acetate fiber, biodegradable polyester and hydroxyl-terminated polylactic acid into a chloroform solution;
the base film layer 10 of this embodiment is a polyvinyl alcohol film.
Example 2
The method for preparing a novel environment-friendly biodegradable film is a preferred embodiment of the present invention, and the method for preparing a degradable film of this embodiment, based on example 1, includes the following steps:
preparation of S1 biodegradable material:
dissolving acetate fiber, biodegradable polyester and hydroxyl-terminated polylactic acid into chloroform at the temperature of 32-38 ℃ according to the ratio of the biodegradable material in grams to the chloroform in ml of 1:40 to obtain a chloroform solution of the biodegradable material; wherein the mass ratio of the acetate fiber to the biodegradable polyester to the hydroxyl-terminated polylactic acid is 3: 3: 4;
standing the prepared chloroform solution for 24 hours, filtering to remove insoluble substances, dripping the filtered chloroform solution into absolute ethyl alcohol under stirring, separating out a biodegradable material solid from the absolute ethyl alcohol, removing the chloroform and the ethyl alcohol on the surface of the biodegradable material solid, and drying at the temperature of 25 ℃ and the vacuum degree of 0.03Pa until the weight is constant to obtain the biodegradable material;
s2, processing the bottom film layer;
mixing and dissolving polyvinyl alcohol and distilled water according to a mass ratio of 4:100 to obtain a polyvinyl alcohol aqueous solution; according to the formula of 1.5-2.0X 10-2Grams polyvinyl alcohol per centimeter2Pouring the prepared polyvinyl alcohol aqueous solution into a film forming mold, standing at room temperature for 2-3 days, and volatilizing the solvent to the full extent to obtain the bottom film layer 10.
S3, dissolving the biodegradable material prepared in the step S1 in chloroform, coating adhesives on the upper surface and the lower surface of the bottom film layer prepared in the step S2, placing the bottom film layer 10 in a mold, respectively pouring the biodegradable materials dissolved in the chloroform in the mold, and volatilizing the chloroform to enable the biodegradable material to be adhered to the bottom film layer 10 to form the biodegradable film.
Example 3
The method for preparing a novel environment-friendly biodegradable film is a preferred embodiment of the present invention, and the method for preparing a degradable film of this embodiment, based on example 1, includes the following steps:
preparation of S1 biodegradable material:
dissolving acetate fiber, biodegradable polyester and hydroxyl-terminated polylactic acid into chloroform at the temperature of 32-38 ℃ according to the ratio of the biodegradable material in grams to the chloroform in ml of 1:50 to obtain a chloroform solution of the biodegradable material; wherein the mass ratio of the acetate fiber to the biodegradable polyester to the hydroxyl-terminated polylactic acid is 3: 3: 4;
standing the prepared chloroform solution for 24 hours, filtering to remove insoluble substances, dripping the filtered chloroform solution into absolute ethyl alcohol under stirring, separating out a biodegradable material solid from the absolute ethyl alcohol, removing the chloroform and the ethyl alcohol on the surface of the biodegradable material solid, and drying at the temperature of 30 ℃ and the vacuum degree of 0.04Pa until the weight is constant to obtain the biodegradable material;
s2, processing the bottom film layer;
mixing and dissolving polyvinyl alcohol and distilled water according to the mass ratio of 4.5:100 to obtain a polyvinyl alcohol aqueous solution; according to the formula of 1.5-2.0X 10-2Grams polyvinyl alcohol per centimeter2Pouring the prepared polyvinyl alcohol aqueous solution into a film forming mold, standing at room temperature for 2-3 days, and volatilizing the solvent to the full extent to obtain the bottom film layer 10.
S3, dissolving the biodegradable material prepared in the step S1 in chloroform, coating adhesives on the upper surface and the lower surface of the bottom film layer prepared in the step S2, placing the bottom film layer 10 in a mold, respectively pouring the biodegradable materials dissolved in the chloroform in the mold, and volatilizing the chloroform to enable the biodegradable material to be adhered to the bottom film layer 10 to form the biodegradable film.
Example 4
The method for preparing a novel environment-friendly biodegradable film is a preferred embodiment of the present invention, and the method for preparing a degradable film of this embodiment, based on example 1, includes the following steps:
preparation of S1 biodegradable material:
dissolving acetate fiber, biodegradable polyester and hydroxyl-terminated polylactic acid into chloroform at the temperature of 32-38 ℃ according to the ratio of the biodegradable material in grams to the chloroform in ml of 1:60 to obtain a chloroform solution of the biodegradable material; wherein the mass ratio of the acetate fiber to the biodegradable polyester to the hydroxyl-terminated polylactic acid is 3: 3: 4;
standing the prepared chloroform solution for 24 hours, filtering to remove insoluble substances, dripping the filtered chloroform solution into absolute ethyl alcohol under stirring, separating out a biodegradable material solid from the absolute ethyl alcohol, removing the chloroform and the ethyl alcohol on the surface of the biodegradable material solid, and drying at the temperature of 35 ℃ and the vacuum degree of 0.05Pa until the weight is constant to obtain the biodegradable material;
s2, processing the bottom film layer;
mixing and dissolving polyvinyl alcohol and distilled water according to a mass ratio of 5:100 to obtain a polyvinyl alcohol aqueous solution; according to the formula of 1.5-2.0X 10-2Grams polyvinyl alcohol per centimeter2Pouring the prepared polyvinyl alcohol aqueous solution into a film forming mold, standing at room temperature for 2-3 days, and volatilizing the solvent to the full extent to obtain the bottom film layer 10.
S3, dissolving the biodegradable material prepared in the step S1 in chloroform, coating adhesives on the upper surface and the lower surface of the bottom film layer prepared in the step S2, placing the bottom film layer 10 in a mold, respectively pouring the biodegradable materials dissolved in the chloroform in the mold, and volatilizing the chloroform to enable the biodegradable material to be adhered to the bottom film layer 10 to form the biodegradable film.
The film is prepared from biodegradable materials, the prepared degradable film is easy to degrade, and pollution to the environment is avoided
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A novel environment-friendly biodegradable film is characterized in that: the film comprises a middle layer and degradable layers positioned on the upper surface and the lower surface of the middle layer; the degradable layers are bonded on the upper surface and the lower surface of the middle layer; the degradable layers are adhered to the upper surface and the lower surface of the middle layer through biodegradable materials, and the biodegradable materials are prepared by adding acetate fibers, biodegradable polyester and hydroxyl-terminated polylactic acid into chloroform solution.
2. The biodegradable film according to claim 1, characterized in that: the bottom film layer is a polyvinyl alcohol film.
3. A method for preparing a biodegradable film according to any one of claims 1-2, characterized in that: the preparation method comprises the following specific steps:
preparation of S1 biodegradable material:
dissolving acetate fiber, biodegradable polyester and hydroxyl-terminated polylactic acid into chloroform at the temperature of 32-38 ℃ according to the ratio of the biodegradable material in grams to the chloroform in ml of 1: 40-60 to obtain a chloroform solution of the biodegradable material;
standing the prepared chloroform solution for 24 hours, filtering to remove insoluble substances, dripping the filtered chloroform solution into absolute ethyl alcohol under stirring, separating out a biodegradable material solid from the absolute ethyl alcohol, removing the chloroform and the ethyl alcohol on the surface of the biodegradable material solid, and drying under a vacuum condition until the weight is constant to obtain the biodegradable material;
s2, processing the bottom film layer;
mixing and dissolving polyvinyl alcohol and distilled water according to a mass ratio of 4-5: 100 to obtain a polyvinyl alcohol aqueous solution; according to the formula of 1.5-2.0X 10-2Grams polyvinyl alcohol per centimeter2Pouring the prepared polyvinyl alcohol aqueous solution into a film forming mold, standing at room temperature for 2-3 days, and volatilizing the solvent to the full extent to obtain the bottom film layer.
S3, dissolving the biodegradable material prepared in the step S1 in chloroform, coating adhesives on the upper surface and the lower surface of the bottom film layer prepared in the step S2, placing the bottom film layer in a mold, respectively pouring the biodegradable materials dissolved in the chloroform in the mold, and volatilizing the chloroform to enable the biodegradable material to be adhered to the bottom film layer to form the biodegradable film.
4. The method for preparing a biodegradable film according to claim 3, characterized in that: in the step S1, the mass ratio of the acetate fiber to the biodegradable polyester to the hydroxyl terminated polylactic acid is 3: 3: 4.
5. the method for preparing a biodegradable film according to claim 3, characterized in that: the vacuum drying condition in the step S1 is that the temperature is 25 ℃ and the vacuum degree is 0.03-0.05 Pa.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103059325A (en) * | 2012-11-23 | 2013-04-24 | 高凡 | Preparation method of novel starch-based cellulose degradable plastic film |
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| CN103342028A (en) * | 2013-07-26 | 2013-10-09 | 内蒙古农业大学 | Biodegradable material composite film and production method thereof |
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| US20210147673A1 (en) * | 2021-01-13 | 2021-05-20 | Qingdao Fullsun Biotechnology Co., Ltd | Full biodegradable high-barrier multi-layer composite material and preparation method thereof as well as packaging bag |
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| CN110170250A (en) * | 2019-06-27 | 2019-08-27 | 长春工业大学 | A kind of degradable poly lactic acid/cellulose-acetafolic and preparation method thereof |
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