Biodegradable packaging vest bag and preparation method thereof

Abstract

The invention relates to the technical field of packaging vest bags, in particular to a biodegradable packaging vest bag and a preparation method thereof.The biodegradable packaging vest bag is prepared from, by weight, 100-120 parts of main materials, 4-6 parts of first additives and 10-20 parts of second additives; high-density polyethylene is selected as the main material; the first additive is composed of a heat stabilizer, a lubricant, an initiator and a coloring agent; according to the invention, the second additive is added by performing ultraviolet irradiation treatment on the primary material, the fiber material can complement broken molecular chains of the high-density polyethylene, and the fiber structure can limit excessive movement of short-chain molecules of the high-density polyethylene, so that the tensile strength of the high-density polyethylene is improved; furthermore, the tensile deformation resistance of the packaging vest bag is not influenced while the biodegradation rate of the packaging vest bag is improved, so that the biodegradable packaging vest bag can be normally used as a normal plastic bag.

Description

Technical Field

[0001] The invention relates to the technical field of packaging vest bags, in particular to a biodegradable packaging vest bag and a preparation method thereof. Background Art

[0002] The packaging vest bag is a common plastic packaging bag, named because of its vest-like shape. It is mainly composed of a bag body and a handle. The bag body is a rectangular bag structure used to hold items, and the handle is a vest-shaped opening formed on both sides of the top of the bag by hot pressing, etc., which is convenient for people to carry.

[0003] In the prior art, there is a kind of degradable packaging vest bag on the market. This packaging vest bag uses a large amount of starch to increase its degradation rate. However, the addition of starch affects the mechanical properties of the packaging vest bag, causing the packaging vest bag to be easily broken and unable to be used normally. Based on this, the present invention provides a biodegradable packaging vest bag and a preparation method thereof. Summary of the invention

[0004] The object of the present invention is to provide a biodegradable packaging vest bag and a preparation method thereof. The packaging vest bag prepared by the present invention not only has a good biodegradability rate, but also has excellent tensile properties, thereby effectively improving the performance of the packaging vest bag.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a biodegradable packaging vest bag, comprising the following raw materials in parts by weight:

[0007] 100-120 parts of main material, 4-6 parts of first additive and 10-20 parts of second additive;

[0008] The main material is high-density polyethylene;

[0009] The first additive is composed of a heat stabilizer, a lubricant, an initiator and a colorant, and the mass ratio of the heat stabilizer, the lubricant, the initiator and the colorant is 1: (0.6-0.8): (0.4-0.6): (0.4-0.6): (0.1-0.3);

[0010] The second additive consists of fiber material and polylactic acid, and the mass ratio of the fiber material to the polylactic acid is 1:(0.4-0.6).

[0011] Furthermore, the heat stabilizer is selected from at least one of maleate and carboxylate.

[0012] Furthermore, the lubricant is selected from at least one of polyethylene wax, n-butyl stearate, and calcium stearate.

[0013] Furthermore, the initiator is benzoin dimethyl ether.

[0014] Furthermore, the fiber material is composed of lignin, konjac glucomannan, flax and cotton, and the mass ratio of the lignin, konjac glucomannan, flax and cotton is 1:1:(0.4-0.6):(0.2-0.4).

[0015] Furthermore, the fiber material is prepared by the following method: flax and cotton are fed into a hammer crusher, the hammer speed is set to 8-10 m / s for 12-16 min, and after crushing, they are fed into a grinding mill, set to 800-1000 r / min for 8-10 min to obtain powder.

[0016] Furthermore, the powder is added into a mixer, lignin and konjac glucomannan are added into the mixer, and the stirring process is set at 120 to 160 r / min for 20 to 30 minutes to obtain a fiber material.

[0017] Furthermore, the first additive is mixed before preparation, and the mixing method is: add the heat stabilizer and the initiator to the mixer, set the mixer to 60-80 r / min and process for 4-6 minutes, then add the lubricant and the colorant, set the mixer to 200-300 r / min and process for 12-16 minutes to obtain the first additive.

[0018] Furthermore, the flax and cotton fibers are selected to have a fiber length of ≤45 mm.

[0019] In a second aspect, the present invention also provides a method for preparing a biodegradable packaging vest bag, comprising the following steps:

[0020] S1: UV treatment: High-density polyethylene and the first additive are placed in an oven and treated at 80-100°C for 40-50 minutes to obtain a preliminary material, which is then placed in an UV box and set at 200-300 μW / cm 2 Carry out irradiation treatment, close the UV box every 3 to 5 minutes, take out the preliminary material and stir it, and irradiate it 5 to 7 times in total to complete the UV treatment;

[0021] S2: Molding treatment: The preliminary material after UV treatment is fed into a mixer, the second additive is added into the mixer, and the mixer is set at 160-200r / min for 10-14min to obtain a prepared material, which is fed into a twin-screw extruder, the temperature is set at 220-240°C, and a melt is obtained by extrusion, and the melt is fed into a blow molding mold, and after blow molding and cooling, a biodegradable packaging vest bag is obtained.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the packaging vest bag adopts high-density polyethylene as the main material, so that the packaging vest bag has good stretchability and waterproof properties. By treating the preliminary material with ultraviolet rays, the ultraviolet rays will break the molecular chains of the high-density polyethylene, and the arrangement between the molecular chains will become loose, which makes it easier for microorganisms and enzymes in the environment to contact the inside of the molecular chains and decompose them, thereby improving the biodegradation rate of the packaging vest bag.

[0024] 2. In the present invention, the second additive is added by treating the preliminary material with ultraviolet light, wherein the fiber material can supplement the broken molecular chains of high-density polyethylene, and the fiber structure can limit the excessive movement of short-chain molecules of high-density polyethylene, thereby improving the tensile strength of high-density polyethylene, thereby improving the biodegradability of the packaging vest bag while ensuring that the tensile deformation resistance of the packaging vest bag is not affected, so that the biodegradable packaging vest bag can be used normally like a normal plastic bag.

[0025] 3. In the present invention, by adding benzoin dimethyl ether to the first additive, benzoin dimethyl ether acts as an initiator during ultraviolet irradiation. Benzoin dimethyl ether undergoes homolytic cleavage reaction when exposed to ultraviolet light to generate active free radicals. The active free radicals can make the chemical bonds in the high-density polyethylene molecular chain more easily broken, guide the transfer of ultraviolet energy and the occurrence of reactions, accelerate the ultraviolet irradiation process, and reduce the energy consumption of the preparation process. DETAILED DESCRIPTION

[0026] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application is described clearly and completely.

[0028] This embodiment provides a biodegradable packaging vest bag, comprising the following raw materials in parts by weight:

[0029] 100-120 parts of main material, 4-6 parts of first additive and 10-20 parts of second additive;

[0030] The main material is high-density polyethylene;

[0031] The first additive is composed of a heat stabilizer, a lubricant, an initiator and a colorant, and the mass ratio of the heat stabilizer, the lubricant, the initiator and the colorant is 1: (0.6-0.8): (0.4-0.6): (0.4-0.6): (0.1-0.3);

[0032] The second additive is composed of fiber material and polylactic acid, and the mass ratio of the fiber material to the polylactic acid is 1: (0.4-0.6).

[0033] In some embodiments, the heat stabilizer is selected from at least one of maleate and carboxylate.

[0034] In some embodiments, the lubricant is selected from at least one of polyethylene wax, n-butyl stearate, and calcium stearate.

[0035] In some embodiments, the initiator is dimethyl benzoate.

[0036] In some embodiments, the fiber material is composed of lignin, konjac glucomannan, flax and cotton, and the mass ratio of lignin, konjac glucomannan, flax and cotton is 1:1:(0.4-0.6):(0.2-0.4).

[0037] In some embodiments, the fiber material is prepared by the following method: flax and cotton are fed into a hammer crusher with the hammer speed set at 8-10 m / s for 12-16 min, and after the crushing process, they are fed into a grinding mill with the speed set at 800-1000 r / min for 8-10 min to obtain powder.

[0038] In some embodiments, the powder is added into a mixer, and lignin and konjac glucomannan are added into the mixer, and the stirring process is set at 120 to 160 r / min for 20 to 30 minutes to obtain a fiber material.

[0039] In the present embodiment, the second additive is added by treating the preliminary material with ultraviolet light, wherein the fiber material can supplement the broken molecular chains of high-density polyethylene, and the fiber structure can limit the excessive movement of short-chain molecules of high-density polyethylene, thereby improving the tensile strength of high-density polyethylene, thereby improving the biodegradability of the packaging vest bag while ensuring that the tensile deformation resistance of the packaging vest bag is not affected, so that the biodegradable packaging vest bag can be used normally like a normal plastic bag.

[0040] In some embodiments, the first additive is mixed before preparation, and the mixing method is as follows: the heat stabilizer and the initiator are mixed and added into a mixer, and the mixture is processed at 60 to 80 r / min for 4 to 6 minutes, and then the lubricant and the colorant are added, and the mixture is processed at 200 to 300 r / min for 12 to 16 minutes to obtain the first additive.

[0041] In this embodiment, when benzoin dimethyl ether is irradiated with ultraviolet light, a homolytic cleavage reaction will occur to produce active free radicals. The active free radicals can make the chemical bonds in the high-density polyethylene molecular chain more easily break, guide the transfer of ultraviolet energy and the occurrence of reactions, accelerate the ultraviolet irradiation process, and reduce the energy consumption of the preparation process.

[0042] In some embodiments, the flax and cotton fibers are selected to have a fiber length of ≤45 mm.

[0043] In some embodiments, a method for preparing a biodegradable packaging vest bag comprises the following steps:

[0044] S1: UV treatment: Put the high-density polyethylene and the first additive into an oven, set the temperature at 80-100°C for 40-50 minutes to obtain a preliminary material, which is then put into a UV box at 200-300 μW / cm 2 Carry out irradiation treatment, close the UV box every 3 to 5 minutes, take out the preliminary material and stir it, and irradiate it 5 to 7 times in total to complete the UV treatment;

[0045] S2: Molding treatment: The preliminary material after UV treatment is fed into a mixer, the second additive is added into the mixer, and the mixer is set at 160-200r / min for 10-14min to obtain a prepared material, which is fed into a twin-screw extruder, the temperature is set at 220-240°C, and a melt is obtained by extrusion, which is fed into a blow molding mold, and after blow molding and cooling, a biodegradable packaging vest bag is obtained.

[0046] In this embodiment, by treating the preliminary material with ultraviolet light, the ultraviolet light irradiation will break the molecular chains of the high-density polyethylene and make the arrangement between the molecular chains loose, which makes it easier for microorganisms and enzymes in the environment to access the interior of the molecular chains and decompose them, thereby improving the biodegradation rate of the packaging vest bag.

[0047] Based on the above embodiments, the inventors also conducted the following experiments:

[0048] It should be noted that the raw materials used in the following experiments are all commercially available raw materials.

[0049] Experiment 1:

[0050] Raw material selection: 100 parts of main material, 4 parts of first additive and 10 parts of second additive;

[0051] The main material is high-density polyethylene;

[0052] The first additive is composed of a heat stabilizer, a lubricant, an initiator and a colorant, and the mass ratio of the heat stabilizer, the lubricant, the initiator and the colorant is 1:0.6:0.4:0.4:0.1;

[0053] The heat stabilizer is maleic acid ester, the lubricant is polyethylene wax, and the initiator is benzoin dimethyl ether.

[0054] The second additive is composed of fiber material and polylactic acid, and the mass ratio of the fiber material to the polylactic acid is 1:0.4;

[0055] The fiber material consists of lignin, konjac glucomannan, flax and cotton, the fiber length of flax and cotton is selected to be ≤45mm, the mass ratio of lignin, konjac glucomannan, flax and cotton is 1:1:0.4:0.2, and the fiber material is prepared by the following method: flax and cotton are sent to a hammer crusher, the hammer speed is set to 8m / s for 12min, and after crushing, they are sent to a grinding mill, set to 800r / min for 8min to obtain powder, the powder is added to a mixer, lignin and konjac glucomannan are added to the mixer, and the mixer is set to 120r / min for stirring for 20min to obtain the fiber material;

[0056] The first additive is mixed before preparation. The mixing method is as follows: heat stabilizer and initiator are mixed and added into a mixer, and the mixture is processed at 60 r / min for 4 min. Then, lubricant and colorant are added, and the mixture is processed at 200 r / min for 12 min to obtain the first additive.

[0057] Preparation of packaging vest bag: put high-density polyethylene and the first additive into an oven, set at 80℃ for 40min to obtain a preliminary material, and then put the preliminary material into a UV box, set at 200μW / cm 2 Carry out irradiation treatment, close the UV box every 3 minutes, take out the preliminary material for stirring, and irradiate for a total of 5 times to complete the UV treatment. Send the preliminary material that has completed the UV treatment into a mixer, add the second additive into the mixer, set 160r / min to treat for 10 minutes, and obtain the prepared material. The prepared material is sent to a twin-screw extruder, the temperature is set to 220°C, and a melt is obtained by extrusion. The melt is sent to a blow molding mold, and after blow molding and cooling, a biodegradable packaging vest bag is obtained.

[0058] Experiment 2:

[0059] Raw materials selection: 110 parts of main material, 5 parts of first additive and 15 parts of second additive;

[0060] The main material is high-density polyethylene;

[0061] The first additive is composed of a heat stabilizer, a lubricant, an initiator and a colorant, and the mass ratio of the heat stabilizer, the lubricant, the initiator and the colorant is 1:0.7:0.5:0.5:0.2;

[0062] The heat stabilizer is carboxylic acid ester, the lubricant is n-butyl stearate, and the initiator is benzoin dimethyl ether.

[0063] The second additive is composed of fiber material and polylactic acid, and the mass ratio of the fiber material to the polylactic acid is 1:0.5;

[0064] The fiber material consists of lignin, konjac glucomannan, flax and cotton, the fiber length of flax and cotton is selected to be ≤45mm, the mass ratio of lignin, konjac glucomannan, flax and cotton is 1:1:0.5:0.3, and the fiber material is prepared by the following method: flax and cotton are sent to a hammer crusher, the hammer speed is set to 9m / s for 14min, and after crushing, they are sent to a grinding mill, set to 900r / min for 9min to obtain powder, the powder is added to a mixer, lignin and konjac glucomannan are added to the mixer, and the mixer is set to 140r / min for stirring for 25min to obtain the fiber material;

[0065] The first additive is mixed before preparation. The mixing method is as follows: heat stabilizer and initiator are mixed and added into a mixer, and the mixture is processed at 70 r / min for 5 min. Then, lubricant and colorant are added, and the mixture is processed at 250 r / min for 14 min to obtain the first additive.

[0066] Preparation of packaging vest bag: put high-density polyethylene and the first additive into an oven, set at 90℃ for 45min to obtain a preliminary material, and then put the preliminary material into a UV box, set at 250μW / cm 2 Carry out irradiation treatment, close the UV box every 4 minutes, take out the preliminary material for stirring, and irradiate treatment 6 times in total to complete the UV treatment, send the preliminary material that has completed the UV treatment into a mixer, add the second additive into the mixer, set 180r / min to treat for 12 minutes, obtain the prepared material, send the prepared material into a twin-screw extruder, set the temperature to 230°C, extrude to obtain a melt, send the melt into a blow molding mold, and after blow molding and cooling, a biodegradable packaging vest bag is obtained.

[0067] Experiment 3:

[0068] Raw materials selection: 120 parts of main material, 6 parts of first additive and 20 parts of second additive;

[0069] The main material is high-density polyethylene;

[0070] The first additive is composed of a heat stabilizer, a lubricant, an initiator and a colorant, and the mass ratio of the heat stabilizer, the lubricant, the initiator and the colorant is 1:0.8:0.6:0.6:0.3;

[0071] The heat stabilizer is maleic acid ester, the lubricant is calcium stearate, and the initiator is benzoin dimethyl ether.

[0072] The second additive is composed of fiber material and polylactic acid, and the mass ratio of the fiber material to the polylactic acid is 1:0.6;

[0073] The fiber material consists of lignin, konjac glucomannan, flax and cotton, the fiber length of flax and cotton is selected to be ≤45mm, the mass ratio of lignin, konjac glucomannan, flax and cotton is 1:1:0.6:0.4, and the fiber material is prepared by the following method: flax and cotton are sent to a hammer crusher, the hammer speed is set to 10m / s for 16min, and after crushing, they are sent to a grinding mill, set to 1000r / min for 10min to obtain powder, the powder is added to a mixer, lignin and konjac glucomannan are added to the mixer, and the mixer is set to 160r / min for stirring for 30min to obtain the fiber material;

[0074] The first additive is mixed before preparation. The mixing method is as follows: heat stabilizer and initiator are mixed and added into a mixer, and the mixture is processed at 80 r / min for 6 min. Then, lubricant and colorant are added, and the mixture is processed at 300 r / min for 16 min to obtain the first additive.

[0075] Preparation of packaging vest bag: put high-density polyethylene and the first additive into an oven, set it at 100℃ for 50min to get a preliminary material, and then put it into a UV box, set it at 300μW / cm 2 Carry out irradiation treatment, close the UV box every 5 minutes, take out the preliminary material for stirring, and irradiate for 7 times in total to complete the UV treatment. Send the preliminary material that has completed the UV treatment into a mixer, add the second additive into the mixer, set 200r / min to treat for 14 minutes, and obtain the prepared material. The prepared material is sent to a twin-screw extruder, the temperature is set to 240°C, and a melt is obtained by extrusion. The melt is sent to a blow molding mold, and after blow molding and cooling, a biodegradable packaging vest bag is obtained.

[0076] Comparative Example 1: The difference between this comparative example and Experiment 1 is that:

[0077] In this comparative example, an equal amount of starch was used to replace the second additive.

[0078] Comparative Example 2: The difference between this comparative example and Experiment 1 is that:

[0079] This comparative example does not contain fiber material.

[0080] Comparative Example 3: The difference between this comparative example and Experiment 1 is that:

[0081] This comparative example was not subjected to ultraviolet irradiation treatment.

[0082] Comparative Example 4: The difference between this comparative example and Experiment 1 is that:

[0083] This comparative example does not contain the second additive.

[0084] Performance test: Performance test was performed on the packaging vest bags prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4.

[0085] In the performance test, according to the biodegradable material compostability test method in "GB / T18006.2-1999 Test Method for Degradability of Disposable Degradable Tableware", the packaging vest bags prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were tested for degradation performance;

[0086] According to the test method in "GB / T 1040.1-2018 Determination of tensile properties of plastics", the packaging vest bags prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were tested for tensile strength and tensile fracture strain, and the obtained test data are recorded in the following table:

[0087]

[0088] Among them, the biodegradation rates of the packaging vest bags prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were 93.4%, 93.6%, 92.1%, 65.4%, 61.3%, 41.6% and 54.5% respectively;

[0089] The biological tensile strengths of the packaging vest bags prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 were 26.4 MPa, 25.8 MPa, 26.1 MPa, 16.4 MPa, 18.5 MPa, 13.6 MPa and 13.7 MPa, respectively;

[0090] The tensile breaking strains of the packaging vest bags prepared in Experiment 1, Experiment 2, Experiment 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 are 352%, 341%, 328%, 181%, 176%, 135% and 151%, respectively.

[0091] It can be seen that the biodegradation rate, tensile strength and tensile fracture strain of the packaging vest bags prepared in Comparative Examples 1, 2, 3 and 4 are all lower than those in Experiments 1, 2 and 3, which indicates that the second additive added by ultraviolet irradiation treatment of the preliminary material, wherein the fiber material can supplement the broken molecular chains of the high-density polyethylene, and the fiber structure can limit the excessive movement of the short-chain molecules of the high-density polyethylene, thereby improving the tensile strength of the high-density polyethylene, thereby improving the biodegradation rate of the packaging vest bag, and ensuring that the tensile deformation resistance of the packaging vest bag is not affected, so that the biodegradable packaging vest bag can be used normally like a normal plastic bag.

[0092] By comparing and analyzing the relevant data in the table, it can be seen that the packaging vest bag prepared by the present invention not only has a good biodegradation rate, but also has excellent tensile properties. This shows that the biodegradable packaging vest bag and the preparation method thereof provided by the present invention have a broader market prospect and are more suitable for promotion.

[0093] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0094] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A biodegradable packaging vest bag, characterized in that: It includes the following raw materials in parts by weight: 100-120 parts of main material, 4-6 parts of first additive and 10-20 parts of second additive; The main material is high-density polyethylene; The first additive is composed of a heat stabilizer, a lubricant, an initiator and a colorant, and the mass ratio of the heat stabilizer, the lubricant, the initiator and the colorant is 1: (0.6-0.8): (0.4-0.6): (0.4-0.6): (0.1-0.3); The second additive consists of fiber material and polylactic acid, and the mass ratio of the fiber material to the polylactic acid is 1:(0.4-0.6).

2. The biodegradable packaging vest bag according to claim 1, characterized in that: The heat stabilizer is selected from at least one of maleate and carboxylate.

3. The biodegradable packaging vest bag according to claim 1, characterized in that: The lubricant is selected from at least one of polyethylene wax, n-butyl stearate and calcium stearate.

4. The biodegradable packaging vest bag according to claim 1, characterized in that: The initiator is dimethyl benzoate.

5. The biodegradable packaging vest bag according to claim 1, characterized in that: The fiber material consists of lignin, konjac glucomannan, flax and cotton, and the mass ratio of the lignin, konjac glucomannan, flax and cotton is 1:1:(0.4-0.6):(0.2-0.4).

6. The biodegradable packaging vest bag according to claim 1, characterized in that: The fiber material is prepared by the following method: flax and cotton are fed into a hammer crusher, the hammer speed is set to 8-10 m / s for 12-16 min, and after the crushing process, they are fed into a grinding mill, set to 800-1000 r / min for 8-10 min to obtain powder.

7. The biodegradable packaging vest bag according to claim 6, characterized in that: The powder is added into a mixer, and lignin and konjac glucomannan are added into the mixer, and the stirring process is set at 120-160 r / min for 20-30 minutes to obtain a fiber material.

8. The biodegradable packaging vest bag according to claim 1, characterized in that: The first additive is mixed before preparation, and the mixing method is: add the heat stabilizer and the initiator to the mixer, set the mixer to 60-80r / min and process for 4-6min, then add the lubricant and the colorant, set the mixer to 200-300r / min and process for 12-16min to obtain the first additive.

9. The biodegradable packaging vest bag according to claim 5, characterized in that: The fiber length of flax and cotton should be ≤45mm.

10. A method for preparing the biodegradable packaging vest bag according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: UV treatment: High-density polyethylene and the first additive are placed in an oven and treated at 80-100°C for 40-50 minutes to obtain a preliminary material, which is then placed in an UV box and set at 200-300 μW / cm 2 Carry out irradiation treatment, close the UV box every 3 to 5 minutes, take out the preliminary material and stir it, and irradiate it 5 to 7 times in total to complete the UV treatment; S2: Molding treatment: The preliminary material after UV treatment is fed into a mixer, the second additive is added into the mixer, and the mixer is set at 160-200r / min for 10-14min to obtain a prepared material, which is fed into a twin-screw extruder, the temperature is set at 220-240°C, and a melt is obtained by extrusion, and the melt is fed into a blow molding mold, and after blow molding and cooling, a biodegradable packaging vest bag is obtained.

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