CN112920568A - Biodegradable express packaging bag and preparation method thereof - Google Patents
Biodegradable express packaging bag and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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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- 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
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
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- 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
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- B32—LAYERED PRODUCTS
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- B32B27/00—Layered products comprising a layer of synthetic resin
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- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
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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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
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- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/14—Printing or colouring
- B32B38/145—Printing
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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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/04—Bags or like containers made of paper and having structural provision for thickness of contents with multiple walls
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/716—Degradable
- B32B2307/7163—Biodegradable
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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
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
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- C08L2201/00—Properties
- C08L2201/06—Biodegradable
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Abstract
The invention relates to a biodegradable express packaging bag and a preparation method thereof, and the biodegradable express packaging bag is characterized in that: the inner film includes: 10-25 parts of PPC, 65-85 parts of PBAT, 3-5 parts of inorganic powder, 0.5-1 part of silicon dioxide, 0.2-0.5 part of lubricant, 1-3 parts of compatilizer, 1-2 parts of color master batch and 0.1-0.3 part of white oil; the interlayer film comprises: 30-60 parts of PPC, 32-66 parts of PBAT, 3-5 parts of inorganic powder, 1-3 parts of compatilizer and 0.1-0.3 part of white oil; the outer layer film includes: 10-25 parts of PPC, 55-85 parts of PBAT, 5-10 parts of inorganic powder, 0.3-0.5 part of lubricant, 1-3 parts of compatilizer, 1-2 parts of color master batch, 0.2-1 part of antioxidant, 0.2-1 part of ultraviolet absorbent and 0.1-0.3 part of white oil. The three-layer film adopts different raw material proportions, has excellent tensile strength, heat sealing strength and sealing performance, can be biodegraded, and solves the problem of white pollution caused by the traditional PE express packaging bag.
Description
Technical Field
The invention relates to a biodegradable express packaging bag and a preparation method thereof, and belongs to the field of high polymer materials.
Background
The white pollution problem is more serious in recent years, and the living environment of human beings is influenced. In the suggestion of further strengthening the plastic pollution treatment in the national development reform committee ecological environment in the field of express packaging, by the end of 2022, postal express distribution points in provinces and cities such as Beijing, Shanghai, Jiangsu, Zhejiang, Fujian, Guangdong and the like prohibit the use of non-degradable plastic packaging bags, disposable plastic woven bags and the like, and reduce the use amount of non-degradable plastic adhesive tapes. By the end of 2025: non-degradable plastic packaging bags, plastic tapes, disposable plastic woven bags and the like are forbidden to be used at nationwide postal express outlets. Because the biodegradable material can be completely degraded into water and carbon dioxide in 180 days under the composting condition, the soil cannot be damaged, and the country encourages the use of the biodegradable material in the express delivery field. With the implementation of national policies, the demand of biodegradable materials will show explosive growth.
The polypropylene carbonate (PPC) has higher mechanical strength, sealing strength and high melt strength, and is widely applied to blow molding products, but the PPC is brittle and cannot be blown alone, and the PPC is required to be blended and modified with PBAT with better flexibility for use. The existing biodegradable express packaging product mainly uses PLA and PBAT as combined modified materials, the sealing strength and the durability of the sealing strength are poor, and the PPC has excellent sealing strength and the durability of the sealing strength, so that the problem can be effectively solved.
Disclosure of Invention
The invention aims to provide a biodegradable express packaging bag and a preparation method thereof, wherein the three-layer co-extrusion biodegradable express packaging bag has high tensile strength, elongation at break, heat seal strength and excellent seal strength durability, can be biodegraded, and can effectively solve the problem of white pollution.
The technical scheme of the invention is realized as follows: a biodegradable express delivery packaging bag comprises an inner layer film, an intermediate layer film and an outer layer film; the method is characterized in that: the inner layer film is prepared from the following raw materials in parts by weight:
10-25 parts of PPC, 65-85 parts of PBAT, 3-5 parts of inorganic powder, 0.5-1 part of silicon dioxide, 0.2-0.5 part of lubricant, 1-3 parts of compatilizer, 1-2 parts of color master batch and 0.1-0.3 part of white oil;
the intermediate layer film is prepared from the following raw materials in parts by weight:
30-60 parts of PPC, 32-66 parts of PBAT, 3-5 parts of inorganic powder, 1-3 parts of compatilizer and 0.1-0.3 part of white oil;
the outer layer film is prepared from the following raw materials in parts by weight:
10-25 parts of PPC, 55-85 parts of PBAT, 5-10 parts of inorganic powder, 0.3-0.5 part of lubricant, 1-3 parts of compatilizer, 1-2 parts of color master batch, 0.2-1 part of antioxidant, 0.2-1 part of ultraviolet absorbent and 0.1-0.3 part of white oil.
A biodegradable express delivery packaging bag is prepared by the following steps:
(1) weighing the raw materials of the inner layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 30-60 s, adding the inorganic powder, the silicon dioxide, the lubricant, the compatilizer and the color master, and stirring for 90-120 s;
(2) weighing the raw materials of the intermediate layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 30-60 s, adding the inorganic powder and the compatilizer, and stirring for 90-120 s;
(3) weighing the raw materials of the outer layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 30-60 s, adding the inorganic powder, the lubricant, the compatilizer, the color master, the antioxidant and the ultraviolet resistant agent, and stirring for 90-120 s;
(4) preparing each layer of modified material by adopting a double-screw extruder, wherein the set temperature of the double-screw extruder is 150-180 ℃, the rotating speed of a screw is 150-400 rpm, and the materials are subjected to melt extrusion, air cooling bracing and grain cutting to obtain each layer of modified material;
(5) prepare three-layer composite biodegradable film through three-layer coextrusion inflation film manufacturing machine, wherein: the set temperature of the film blowing machine is 155-175 ℃, the rotating speed of a screw is 50-200 rpm, the traction speed is 10-20 m/min, and the blow-up ratio is 3-5;
(6) printing the film by a printing machine, gluing the glue on a glue applying opening, covering the film by a release film, and hot-cutting and hot-sealing by a bag making machine, wherein the hot-sealing temperature is 240-280 ℃, and the hot-cutting speed is 70-160/min, so that the three-layer co-extrusion biodegradable express packaging bag is obtained.
The film thickness ratio of the inner layer film, the middle layer film and the outer layer film of the biodegradable express packaging bag is as follows: 1:1.5:1.
The total thickness of the three layers of the biodegradable express packaging bag is 30-60 mu m.
The number average molecular weight of the PPC is 100-150 kg/mol, and the molecular weight distribution is 1.8-3; the PBAT has the number average molecular weight of 40-80 kg/mol and the molecular weight distribution of 1.9-2.5; the compatilizer comprises one of vinyl acetate, epoxy ADR-4370, ADR-4468, ADR-4300, PTW, YTPA-801 and KL-E4370; the lubricant comprises one of ethylene bis stearamide, erucamide, oleamide, calcium stearate and stearic acid; the inorganic powder comprises one of talcum powder, calcium carbonate, barium sulfate, nano potassium aluminum silicate, clay and kaolin; white oil No. 15; the color master is PBAT carrier color master; the antioxidant comprises one of antioxidant 1010, antioxidant 1098 and antioxidant 626; the ultraviolet absorber includes one of ultraviolet absorbers 234, 765, 531 and 571.
The invention has the advantages that the raw materials of the inner layer film, the middle layer film and the outer layer film are respectively and uniformly mixed according to the formula, each layer of modified material is prepared by adopting a double-screw extruder, and then the biodegradable film is prepared by adopting a three-layer co-extrusion film blowing machine, wherein the inner layer film adopts a material formula with excellent opening property, film forming property and sealing strength, the middle layer film adopts a material formula with excellent mechanical property and film forming property, and the outer layer film adopts a material formula with excellent printing property, film forming property and weather resistance; the packaging bag has biodegradability, excellent mechanical property, heat sealing property, aging resistance and sealing and gluing property, can replace the traditional PE express packaging bag in the market, and is favorable for solving white pollution.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Detailed Description
The invention is further described with reference to the following examples: PPC with the number average molecular weight of 150 kg/mol and the molecular weight distribution of 2.6 is selected from a novel chemical industry (Jilin) Co., Ltd; PBAT has the number average molecular weight of 60 kg/mol and the molecular weight distribution of 2.5 and is sourced from Xinjiang Lanshantun river chemical industry Co., Ltd; the compatilizer is vinyl acetate and is sourced from Wacker chemical Co., Ltd; the lubricant is erucamide, the source is not particularly limited, and the lubricant can be a product sold on the market generally; the inorganic powder is nano potassium aluminum silicate and is from Fujian Changtai mineral products Co Ltd; the white oil is No. 15, has no special limitation on the source, and can be a product sold on the market generally; the color master is PBAT carrier color master, the source is not specially limited, and the color master can be generally sold in the market; the antioxidant is 1010 and is from Italian synthetic materials, Inc.; the ultraviolet absorbent is ultraviolet absorbent 531, and is available from Italon (Tianjin) synthetic materials, Inc.
Example 1
The inner layer film 1, the intermediate layer film 2 and the outer layer film 3 are prepared from the following raw materials in parts by weight as shown in figure 1, and the preparation method comprises the following steps:
1.1 starting materials
10 parts of PPC, 65 parts of PBAT, 3 parts of inorganic powder, 0.5 part of silicon dioxide, 0.2 part of lubricant, 1 part of compatilizer, 1 part of color master batch and 0.1 part of white oil.
30 parts of PPC, 32 parts of PBAT, 3 parts of inorganic powder, 1 part of compatilizer and 0.1 part of white oil.
Outer layer film 3 raw material:
10 parts of PPC, 55 parts of PBAT, 5 parts of inorganic powder, 0.3 part of lubricant, 1 part of compatilizer, 1 part of color master batch, 0.2 part of antioxidant, 0.2 part of ultraviolet absorbent and 0.1 part of white oil.
1.2 the preparation method is as follows:
(1) weighing the raw materials of the inner layer film 1 according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 30 s, adding the inorganic powder, the silicon dioxide, the lubricant, the compatilizer and the color master, and stirring for 90 s;
(2) weighing the raw materials of the intermediate layer film 2 according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 30 s, adding the inorganic powder and the compatilizer, and stirring for 90 s;
(3) weighing the raw materials of the outer layer membrane 3 according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 30 s, adding the inorganic powder, the lubricant, the compatilizer, the color master, the antioxidant and the ultraviolet resistant agent, and stirring for 90 s;
(4) preparing each layer of modified material by adopting a double-screw extruder, wherein the set temperature of the double-screw extruder is 150-180 ℃, the screw rotating speed is 150 rpm, and the materials are subjected to melt extrusion, air cooling bracing and grain cutting to obtain each layer of modified material;
(5) prepare three-layer composite biodegradable film through three-layer coextrusion inflation film manufacturing machine, wherein: the set temperature of the film blowing machine is 155-175 ℃, the rotating speed of a screw is 50 rpm, the traction speed is 10 m/min, and the blowing ratio is 3;
(6) printing the film by a printing machine, gluing the glue opening, covering the film by a release film, and hot-cutting and hot-sealing by a bag making machine, wherein the hot-sealing temperature is 240 ℃, and the hot-cutting speed is 70 pieces/min, so that the three-layer co-extrusion biodegradable express packaging bag is obtained.
The thickness ratio of the inner layer film 1, the middle layer film 2 and the outer layer film 3 of the biodegradable express packaging bag is as follows: 1:1.5: 1;
the total thickness of the three-layer film of the biodegradable express packaging bag is 56 micrometers.
Example 2
The inner layer film 1, the middle layer film 2 and the outer layer film 3 are prepared from the following raw materials in parts by weight:
2.1 starting materials
18 parts of PPC, 75 parts of PBAT, 4 parts of inorganic powder, 0.7 part of silicon dioxide, 0.4 part of lubricant, 2 parts of compatilizer, 1.5 parts of color master batch and 0.2 part of white oil.
45 parts of PPC, 49 parts of PBAT, 4 parts of inorganic powder, 2 parts of compatilizer and 0.2 part of white oil.
Outer layer film 3 raw material:
18 parts of PPC, 70 parts of PBAT, 7.5 parts of inorganic powder, 0.4 part of lubricant, 2 parts of compatilizer, 1.5 parts of color master batch, 0.5 part of antioxidant, 0.5 part of ultraviolet absorbent and 0.2 part of white oil.
2.2 the preparation method is as follows:
(1) weighing the raw materials of the inner layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 45 s, adding the inorganic powder, the silicon dioxide, the lubricant, the compatilizer and the color master, and stirring for 105 s;
(2) weighing the raw materials of the intermediate layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 45 s, adding the inorganic powder and the compatilizer, and stirring for 105 s;
(3) weighing the raw materials of the outer layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 45 s, adding the inorganic powder, the lubricant, the compatilizer, the color master, the antioxidant and the ultraviolet resistant agent, and stirring for 105 s;
(4) preparing each layer of modified material by adopting a double-screw extruder, wherein the set temperature of the double-screw extruder is 160-180 ℃, the screw rotating speed is 250 rpm, and the materials are subjected to melt extrusion, air cooling bracing and grain cutting to obtain each layer of modified material;
(5) prepare three-layer composite biodegradable film through three-layer coextrusion inflation film manufacturing machine, wherein: the set temperature of the film blowing machine is 160-175 ℃, the rotating speed of a screw is 100 rpm, the traction speed is 15 m/min, and the blowing ratio is 4;
(6) printing the film by a printing machine, gluing the glue opening, covering the film by a release film, and hot-cutting and hot-sealing by a bag making machine, wherein the hot-sealing temperature is 250 ℃, and the hot-cutting speed is 90/min, so that the three-layer co-extrusion biodegradable express packaging bag is obtained.
The thickness ratio of the inner layer film, the middle layer film and the outer layer film of the biodegradable express packaging bag is as follows: 1:1.5:1.
The total thickness of the three-layer film of the biodegradable express packaging bag is 56 micrometers.
Example 3
The inner layer film, the middle layer film and the outer layer film are prepared from the following raw materials in parts by weight:
3.1 starting materials
Inner layer film raw material:
25 parts of PPC, 85 parts of PBAT, 5 parts of inorganic powder, 1 part of silicon dioxide, 0.5 part of lubricant, 3 parts of compatilizer, 2 parts of color master batch and 0.3 part of white oil.
Intermediate layer film raw material:
60 parts of PPC, 66 parts of PBAT, 5 parts of inorganic powder, 3 parts of compatilizer and 0.3 part of white oil.
Outer layer film raw materials:
25 parts of PPC, 85 parts of PBAT, 10 parts of inorganic powder, 0.5 part of lubricant, 3 parts of compatilizer, 2 parts of color master batch, 1 part of antioxidant, 1 part of ultraviolet absorbent and 0.3 part of white oil.
3.2 the preparation method is as follows:
(1) weighing the raw materials of the inner layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 60 s, adding the inorganic powder, the silicon dioxide, the lubricant, the compatilizer and the color master, and stirring for 120 s;
(2) weighing the raw materials of the intermediate layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 60 s, adding the inorganic powder and the compatilizer, and stirring for 120 s;
(3) weighing the raw materials of the outer layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 60 s, adding the inorganic powder, the lubricant, the compatilizer, the color master, the antioxidant and the ultraviolet resistant agent, and stirring for 120 s;
(4) preparing each layer of modified material by adopting a double-screw extruder, wherein the set temperature of the double-screw extruder is 160-180 ℃, the screw rotating speed is 400 rpm, and the materials are subjected to melt extrusion, air cooling bracing and grain cutting to obtain each layer of modified material;
(5) prepare three-layer composite biodegradable film through three-layer coextrusion inflation film manufacturing machine, wherein: the set temperature of the film blowing machine is 160-175 ℃, the rotating speed of a screw is 150 rpm, the traction speed is 20 m/min, and the blowing ratio is 5;
(6) printing the film by a printing machine, gluing the glue opening, covering the film by a release film, and hot-cutting and hot-sealing by a bag making machine, wherein the hot-sealing temperature is 260 ℃, and the hot-cutting speed is 100/min, so that the three-layer co-extrusion biodegradable express packaging bag is obtained.
The thickness ratio of the inner layer film, the middle layer film and the outer layer film of the biodegradable express packaging bag is as follows: 1:1.5:1.
The total thickness of the three-layer film of the biodegradable express packaging bag is 56 micrometers.
Comparative example 1
The inner layer film, the middle layer film and the outer layer film are prepared from the following raw materials in parts by weight:
1.1 starting materials
Inner layer film raw material:
5 parts of PPC, 87.5 parts of PBAT, 3 parts of inorganic powder, 0.5 part of silicon dioxide, 0.4 part of lubricant, 2 parts of compatilizer, 1.5 parts of color master batch and 0.1 part of white oil.
Intermediate layer film raw material:
10 parts of PPC, 84.9 parts of PBAT, 3 parts of inorganic powder, 2 parts of compatilizer and 0.1 part of white oil.
Outer layer film raw materials:
5 parts of PPC, 83.1 parts of PBAT, 7 parts of inorganic powder, 0.3 part of lubricant, 2 parts of compatilizer, 1.5 parts of color master batch, 0.5 part of antioxidant, 0.5 part of ultraviolet absorbent and 0.1 part of white oil.
1.2 preparation method
(1) Weighing the raw materials of the inner layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder, the silicon dioxide, the lubricant, the compatilizer and the color master, and stirring for 100 s;
(2) weighing the raw materials of the intermediate layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder and the compatilizer, and stirring for 100 s;
(3) weighing the raw materials of the outer layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder, the lubricant, the compatilizer, the color master, the antioxidant and the ultraviolet resistant agent, and stirring for 100 s;
(4) preparing each layer of modified material by adopting a double-screw extruder, wherein the set temperature of the double-screw extruder is 160-180 ℃, the rotating speed of a screw is 300 rpm, and the materials are subjected to melt extrusion, air cooling bracing and grain cutting to obtain each layer of modified material;
(5) prepare three-layer composite biodegradable film through three-layer coextrusion inflation film manufacturing machine, wherein: the set temperature of the film blowing machine is 160-175 ℃, the rotating speed of a screw is 120 rpm, the traction speed is 17 m/min, and the blowing ratio is 4;
(6) printing the film by a printing machine, gluing the glue opening, covering the film by a release film, and hot-cutting and hot-sealing by a bag making machine, wherein the hot-sealing temperature is 250 ℃, and the hot-cutting speed is 100/min, so that the three-layer co-extrusion biodegradable express packaging bag is obtained.
The thickness ratio of the inner layer film, the middle layer film and the outer layer film of the three-layer co-extrusion biodegradable express packaging bag is as follows: 1:1.5:1.
The total thickness of the three-layer film of the three-layer co-extrusion biodegradable express packaging bag is 56 micrometers.
Comparative example 2
The inner layer film, the middle layer film and the outer layer film are prepared from the following raw materials in parts by weight:
2.1 starting materials
Inner layer film raw material:
94.5 parts of PBAT, 3 parts of inorganic powder, 0.5 part of silicon dioxide, 0.4 part of lubricant, 1.5 parts of color master batch and 0.1 part of white oil.
Intermediate layer film raw material:
96.9 parts of PBAT, 3 parts of inorganic powder and 0.1 part of white oil.
Outer layer film raw materials:
90.1 parts of PBAT, 7 parts of inorganic powder, 0.3 part of lubricant, 1.5 parts of color master batch, 0.5 part of antioxidant, 0.5 part of ultraviolet absorbent and 0.1 part of white oil.
2.2 preparation method
(1) Weighing the raw materials of the inner layer film according to a formula, adding the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder, the silicon dioxide, the lubricant and the color master, and stirring for 90 s;
(2) weighing the raw materials of the intermediate layer film according to a formula, adding the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder, and stirring for 90 s;
(3) weighing the raw materials of the outer layer film according to a formula, adding the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder, the lubricant, the color master, the antioxidant and the ultraviolet resistant agent, and stirring for 90 s;
(4) preparing each layer of modified material by adopting a double-screw extruder, wherein the set temperature of the double-screw extruder is 150-180 ℃, the rotating speed of a screw is 300 rpm, and the materials are subjected to melt extrusion, air cooling bracing and grain cutting to obtain each layer of modified material;
(5) prepare three-layer composite biodegradable film through three-layer coextrusion inflation film manufacturing machine, wherein: the set temperature of the film blowing machine is 160-175 ℃, the rotating speed of a screw is 90 rpm, the traction speed is 13 m/min, and the blow-up ratio is 3.5;
(6) printing the film by a printing machine, gluing the glue opening, covering the film by a release film, and hot-cutting and hot-sealing by a bag making machine, wherein the hot-sealing temperature is 260 ℃, and the hot-cutting speed is 100/min, so that the three-layer co-extrusion biodegradable express packaging bag is obtained.
The thickness ratio of the inner layer film, the middle layer film and the outer layer film of the three-layer co-extrusion biodegradable express packaging bag is as follows: 1:1.5:1.
The total thickness of the three-layer film of the three-layer co-extrusion biodegradable express packaging bag is 56 micrometers.
Comparative example 3
The inner layer film, the middle layer film and the outer layer film are prepared from the following raw materials in parts by weight:
3.1 starting materials
Inner layer film raw material:
45 parts of PPC, 45.6 parts of PBAT, 3 parts of inorganic powder, 0.8 part of silicon dioxide, 0.5 part of lubricant, 3 parts of compatilizer, 2 parts of color master batch and 0.1 part of white oil.
Intermediate layer film raw material:
75 parts of PPC, 18.9 parts of PBAT, 3 parts of inorganic powder, 3 parts of compatilizer and 0.1 part of white oil.
Outer layer film raw materials:
45 parts of PPC, 39.4 parts of PBAT, 8 parts of inorganic powder, 0.5 part of lubricant, 3 parts of compatilizer, 3 parts of color master batch, 0.5 part of antioxidant, 0.5 part of ultraviolet absorbent and 0.1 part of white oil.
3.2 preparation method
(1) Weighing the raw materials of the inner layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder, the silicon dioxide, the lubricant, the compatilizer and the color master, and stirring for 90 s;
(2) weighing the raw materials of the intermediate layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder and the compatilizer, and stirring for 90 s;
(3) weighing the raw materials of the outer layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 50 s, adding the inorganic powder, the lubricant, the compatilizer, the color master, the antioxidant and the ultraviolet resistant agent, and stirring for 90 s;
(4) preparing each layer of modified material by adopting a double-screw extruder, wherein the set temperature of the double-screw extruder is 150-175 ℃, the screw rotating speed is 350 rpm, and the materials are subjected to melt extrusion, air cooling bracing and grain cutting to obtain each layer of modified material;
(5) prepare three-layer composite biodegradable film through three-layer coextrusion inflation film manufacturing machine, wherein: the set temperature of the film blowing machine is 160-175 ℃, the rotating speed of a screw is 90 rpm, the traction speed is 13 m/min, and the blow-up ratio is 3.5;
(6) printing the film by a printing machine, gluing the glue opening, covering the film by a release film, and hot-cutting and hot-sealing by a bag making machine, wherein the hot-sealing temperature is 245 ℃, and the hot-cutting speed is 70 pieces/min, so that the three-layer co-extrusion biodegradable express packaging bag is obtained.
The thickness ratio of the inner layer film, the middle layer film and the outer layer film of the three-layer co-extrusion biodegradable express packaging bag is as follows: 1:1.5:1.
The total thickness of the three-layer film of the three-layer co-extrusion biodegradable express packaging bag is 56 micrometers.
The properties of examples 1-3 and comparative examples 1-3 are shown in Table 1:
TABLE 1 Properties of examples 1-3 and comparative examples 1-3
Attached: in Table 1, the seal strength is tested according to the national standard GB/T1040-. As can be seen from table 1, the composite films provided in embodiments 1 to 3 of the present invention have excellent tensile strength, elongation at break, and heat seal strength. Comparison with the comparative example shows that: when the content of the PPC reaches a certain amount, the composite film has better tensile strength and heat sealing strength, but when the content of the PPC is lower, the composite film is softer and has low strength. When the composite film is more than a certain amount, the composite film becomes brittle and cannot be used in express packaging, and good performance can be obtained only by controlling the distribution ratio of the components within a certain range.
The above embodiments of the present invention are only intended to help understand the method of the present invention and its core idea. Various modifications to these embodiments will be readily apparent to those skilled in the art, and such improvements and modifications are intended to be within the scope of the claims.
Claims (5)
1. A biodegradable express delivery packaging bag comprises an inner layer film, an intermediate layer film and an outer layer film; the method is characterized in that: the inner layer film is prepared from the following raw materials in parts by weight:
10-25 parts of PPC, 65-85 parts of PBAT, 3-5 parts of inorganic powder, 0.5-1 part of silicon dioxide, 0.2-0.5 part of lubricant,
1-3 parts of a compatilizer, 1-2 parts of a color master batch and 0.1-0.3 part of white oil;
the middle layer film is prepared from the following raw materials in parts by weight:
30-60 parts of PPC, 32-66 parts of PBAT, 3-5 parts of inorganic powder, 1-3 parts of compatilizer and 0.1-0.3 part of white oil;
the outer layer film is prepared from the following raw materials in parts by weight:
10-25 parts of PPC, 55-85 parts of PBAT, 5-10 parts of inorganic powder, 0.3-0.5 part of lubricant, 1-3 parts of compatilizer, 1-2 parts of color master batch, 0.2-1 part of antioxidant, 0.2-1 part of ultraviolet absorbent and 0.1-0.3 part of white oil.
2. A preparation method of a biodegradable express packaging bag is characterized by comprising the following specific steps:
weighing the raw materials of the inner layer film according to the formula, adding the PPC, PBAT and white oil into a low-speed mixer, and stirring
Adding inorganic powder, silicon dioxide, a lubricant, a compatilizer and color master batch and stirring for 90-120 s after 30-60 s;
(2) weighing the raw materials of the intermediate layer film according to a formula, adding the PPC, the PBAT and the white oil into a low-speed mixer, stirring for 30-60 s, adding the inorganic powder and the compatilizer, and stirring for 90-120 s;
(3) weighing the raw materials of the outer layer membrane according to the formula, adding the PPC, PBAT and white oil in the raw materials into a low-speed mixer, and stirring
Adding inorganic powder, a lubricant, a compatilizer, a color master, an antioxidant and an ultraviolet resistant agent, and stirring for 90-120 s;
(4) preparing each layer of modified material by adopting a double-screw extruder, wherein the set temperature of the double-screw extruder is 150-180 ℃, the rotating speed of a screw is 150-400 rpm, and the materials are subjected to melt extrusion, air cooling bracing and grain cutting to obtain each layer of modified material;
(5) prepare three-layer composite biodegradable film through three-layer coextrusion inflation film manufacturing machine, wherein: the set temperature of the film blowing machine is 155-175 ℃, the rotating speed of a screw is 50-200 rpm, the traction speed is 10-20 m/min, and the blow-up ratio is 3-5;
(6) printing the film by a printing machine, gluing the glue on a glue applying opening, covering the film by a release film, and hot-cutting and hot-sealing by a bag making machine, wherein the hot-sealing temperature is 240-280 ℃, and the hot-cutting speed is 70-160/min, so that the three-layer co-extrusion biodegradable express packaging bag is obtained.
3. The biodegradable express delivery packaging bag according to claim 1, wherein the film thickness ratio of the inner layer film, the middle layer film and the outer layer film is as follows: 1:1.5:1.
4. The biodegradable express delivery packaging bag according to claim 1, wherein the total thickness of the inner layer film, the middle layer film and the outer layer film is 30-60 μm.
5. The biodegradable express packaging bag of claim 1, wherein the PPC has a number average molecular weight of 100-150 kg/mol and a molecular weight distribution of 1.8-3; the PBAT has the number average molecular weight of 40-80 kg/mol and the molecular weight distribution of 1.9-2.5; the compatilizer comprises one of vinyl acetate, epoxy ADR-4370, ADR-4468, ADR-4300, PTW, YTPA-801 and KL-E4370; the lubricant comprises one of ethylene bis stearamide, erucamide, oleamide, calcium stearate and stearic acid; the inorganic powder comprises one of talcum powder, calcium carbonate, barium sulfate, nano potassium aluminum silicate, clay and kaolin; white oil No. 15; the color master is PBAT carrier color master; the antioxidant comprises one of antioxidant 1010, antioxidant 1098 and antioxidant 626; the ultraviolet absorber includes one of ultraviolet absorbers 234, 765, 531 and 571.
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