阅读说明：本技术 一种环保可回收的软包装材料及其制备工艺 (Environment-friendly recyclable flexible packaging material and preparation process thereof ) 是由 周隆裕 卞松锋 于 2021-07-09 设计创作，主要内容包括：本发明属于软包装材料领域,具体公开了一种环保可回收的软包装材料及其制备工艺,所述软包装材料由以下重量份的原料制成：葡聚糖40-60份；秸秆纤维30-60份、分散剂25-45份、海藻酸钠15-25份、低聚PVA10-20份、聚乙二醇10-20份、增塑剂、白炭黑、消泡剂。本发明公开的软包装材料,主要使用生物基原料,环境友好,有机溶剂含量低,原料易得,制备简单；可以直接使用本单一材料制备成软包装,无需复合多种材料加工,成本低,工序少；产品机械强度高,阻氧和耐腐蚀性能好,易于回收再利用,绿色环保。(The invention belongs to the field of flexible packaging materials, and particularly discloses an environment-friendly recyclable flexible packaging material and a preparation process thereof, wherein the flexible packaging material is prepared from the following raw materials in parts by weight: 40-60 parts of glucan; 30-60 parts of straw fiber, 25-45 parts of dispersing agent, 15-25 parts of sodium alginate, 78-20 parts of oligomeric PVA10, 10-20 parts of polyethylene glycol, plasticizer, white carbon black and defoaming agent. The flexible packaging material disclosed by the invention mainly uses bio-based raw materials, is environment-friendly, has low organic solvent content, is easy to obtain the raw materials, and is simple to prepare; the single material can be directly used for preparing the flexible package, the processing of compounding various materials is not needed, the cost is low, and the working procedures are few; the product has high mechanical strength, good oxygen resistance and corrosion resistance, easy recycling and environmental protection.)

1. An environment-friendly recyclable flexible packaging material is characterized by being prepared from the following raw materials in parts by weight:

2. the environmentally friendly recyclable flexible packaging material as claimed in claim 1, is prepared from the following raw materials in parts by weight:

3. the environmentally friendly recyclable flexible packaging material as claimed in claim 1, is prepared from the following raw materials in parts by weight:

4. the environmentally friendly and recyclable flexible packaging material as described in claim 1, wherein the glucan is yeast- β -glucan having a molecular weight of 800-1000 kD.

5. The environmentally friendly and recyclable flexible packaging material as claimed in claim 1, wherein the straw fiber is selected from one of rice straw fiber, wheat straw fiber, corn straw fiber, rape straw fiber and cotton straw fiber.

6. The environmentally friendly recyclable flexible packaging material as claimed in claim 5, wherein the straw fiber is corn straw fiber and is prepared by the following steps:

s1 pretreatment: putting the corn straws into a crusher for crushing, and sieving the crushed corn straws through a sieve mesh of 20-40 meshes to obtain coarse straw materials;

s2 pre-leaching: soaking the coarse material by using potassium hydroxide with the solid-to-liquid ratio of 1:3 and the concentration of 3-10%; soaking at 40-60 deg.C for 15-30 min;

s3 evaporation: filtering the above raw materials, placing into a reaction kettle, steaming at high temperature, and stopping when the water content is 50%;

s4 grinding: putting the raw materials into a pulping machine for pulping to obtain straw pulp;

s5 vacuum drying: putting the straw slurry into a vacuum drier for vacuum drying, wherein the pressure is 0.001-0.003Mpa, and the temperature is 150-;

s6 fine grinding: and (3) putting the straw powder after vacuum drying into a ball mill for fine grinding, sieving with a 200-mesh sieve and collecting to obtain the corn straw fiber.

7. The environmentally recyclable flexible packaging material as described in claim 1, wherein the average molecular weight of the oligomeric PVA is 15000-.

8. The environmentally friendly recyclable flexible packaging material as claimed in claim 1, wherein the plasticizer is diphenylmethane diisocyanate: the mass ratio of the dipropylene glycol dibenzoate is 1: 1-1: 5, mixing the components.

9. The environmentally friendly recyclable flexible packaging material as claimed in claim 1, wherein the dispersant is prepared by mixing the following raw materials in parts by weight:

10. the process for the preparation of environmentally friendly recyclable flexible packaging material as claimed in any one of claims 1 to 9, prepared by the steps of:

preparation of S1 raw material: preparing straw fibers, a dispersing agent and a plasticizer;

s2 air drying: respectively placing the straw fiber, the glucan and the oligomeric PVA in an air-blowing drying device for drying, wherein the oligomeric PVA and the glucan are dried until the moisture content is lower than 300ppm for later use; drying the straw fiber until the water content is lower than 2.5 percent;

s3 primary stirring: pouring the dried straw fibers, the glucan and the oligomeric PVA into a mixer, adding a dispersing agent, and stirring for 25-40min at the stirring speed of 250-400rpm and the temperature of 50-60 ℃; then adding polyethylene glycol and sodium alginate, stirring for 15-20min at the same temperature and the stirring speed of 1100-1300 rpm, and stopping heating;

s4 secondary stirring: cooling to 40 ℃, keeping the temperature of 40 ℃ and continuing stirring, adding a plasticizer at the stirring speed of 1400-1500 rpm, and stirring for 25-35 seconds; adding white carbon black and a defoaming agent, stirring for 15-20 seconds and discharging;

s5, screw extrusion: and (3) moving the mixed material into a bin of a co-rotating double-screw extruder with the length-diameter ratio of more than 96:1, setting the processing temperature of the double-screw extruder to be 140 ℃, keeping the temperature for 3-6min after the temperature reaches the required process temperature, starting the double-screw extruder, controlling the absolute vacuum degree of the double-screw extruder to be lower than 5000Pa and the rotating speed of a main machine screw to be 100-plus-material 500rpm, and performing extrusion granulation and cooling to obtain the environment-friendly recyclable flexible packaging material.

Technical Field

The invention belongs to the field of flexible packaging materials, and particularly discloses an environment-friendly recyclable flexible packaging material and a preparation process thereof.

Background

The traditional flexible packaging material mainly comprises a film, ink and an adhesive, and the proportion of each of the materials can reach 70%, 20% and 10%. Plastic flexible packages have many advantages, such as light weight, portability, high impact resistance, good barrier properties, ease of printing, low cost, and the like, and can be used for microwave heating. The food industry is the most important application market of the flexible packaging industry and accounts for 80 percent of the global production value of the flexible packaging market. The most basic functions of food flexible package are to maintain the color, flavor and taste of food during its shelf life. When the shelf life of 30 percent of foods in the market is close to, the original color, aroma, taste and other characteristics of the foods are lost, and consumers can seriously affect the health of the foods once eating the foods without knowing. This is due to the fact that some non-responsible food enterprises intentionally extend the shelf life of food products when marking them for commercial consideration of the food product sales radius and period; on the other hand, the adopted food soft packaging material is not proper, so that the food characteristic can not be really protected.

At present, in flexible packaging materials, composite materials are mostly used, for example, PET (polyester resin), OPP (o-phenylphenol) and the like are used as base materials to provide basic strength; PVDC (polyvinylidene chloride), nylon and other materials are coated on the flame retardant coating, so that the effects of water resistance, corrosion resistance, flame resistance, oxygen barrier and the like are realized; the two are processed compositely to be used as packaging materials. The composite materials have more preparation processes, most of the composite materials are not easy to recycle, even most of the composite materials are difficult to decompose, and a large amount of toxic gas is generated during combustion, so that the environment is greatly polluted. Therefore, the market needs a flexible packaging material made of a single material, which has the characteristics of strength, hardness, brittleness, scratch resistance and high temperature resistance of a PET material, corrosion resistance and good oxygen resistance of a PVDC material, has good recycling performance, is used for packaging food and medical products, and is environment-friendly and energy-saving while the manufacturing process is greatly reduced.

Disclosure of Invention

Aiming at the defects, the invention discloses an environment-friendly recyclable flexible packaging material and a preparation process thereof. The method has the advantages that the method uses bio-based raw materials, is environment-friendly, has low organic solvent content, is easy to obtain the raw materials, and is simple to prepare; the single material can be directly used for preparing the flexible packaging material.

The technical scheme of the invention is as follows:

an environment-friendly recyclable flexible packaging material is prepared from the following raw materials in parts by weight:

preferably, the environmentally-friendly recyclable flexible packaging material is prepared from the following raw materials in parts by weight:

more preferably, the environmentally-friendly recyclable flexible packaging material is prepared from the following raw materials in parts by weight:

further, the environment-friendly and recyclable flexible packaging material is characterized in that the glucan is yeast-beta-glucan and has the molecular weight of 800-1000 KD.

Further, in the flexible packaging material which is environment-friendly and recyclable, the straw fiber is selected from one of rice straw fiber, wheat straw fiber, corn straw fiber, rape straw fiber and cotton straw fiber.

Further, the straw fiber is corn straw fiber, and the environment-friendly recyclable flexible packaging material is prepared by the following steps:

s1 pretreatment: putting the corn straws into a crusher for crushing, and sieving the crushed corn straws through a sieve mesh of 20-40 meshes to obtain coarse straw materials;

s2 pre-leaching: soaking the coarse material by using potassium hydroxide with the solid-to-liquid ratio of 1:3 and the concentration of 3-10%; soaking at 40-60 deg.C for 15-30 min;

s3 evaporation: filtering the above raw materials, placing into a reaction kettle, steaming at high temperature, and stopping when the water content is 50%;

s4 grinding: putting the raw materials into a pulping machine for pulping to obtain straw pulp;

s5 vacuum drying: putting the straw slurry into a vacuum drier for vacuum drying, wherein the pressure is 0.001-0.003Mpa, and the temperature is 150-;

s6 fine grinding: and (3) putting the straw powder after vacuum drying into a ball mill for fine grinding, sieving with a 200-mesh sieve and collecting to obtain the corn straw fiber.

Further, in the above-mentioned environmentally friendly recyclable flexible packaging material, the average molecular weight of the oligomeric PVA is 15000-.

Further, the plasticizer is diphenylmethane diisocyanate: the mass ratio of the dipropylene glycol dibenzoate is 1: 1-1: 5, mixing the components.

Further, the environmentally-friendly recyclable flexible packaging material is prepared by mixing the following raw materials in parts by weight:

further, the preparation process of the environment-friendly recyclable flexible packaging material is characterized by comprising the following steps:

preparation of S1 raw material: preparing straw fibers, a dispersing agent and a plasticizer;

s2 air drying: respectively placing the straw fiber, the glucan and the oligomeric PVA in an air-blowing drying device for drying, wherein the oligomeric PVA and the glucan are dried until the moisture content is lower than 300ppm for later use; drying the straw fiber until the water content is lower than 2.5 percent;

s3 primary stirring: pouring the dried straw fibers, the glucan and the oligomeric PVA into a mixer, adding a dispersing agent, and stirring for 25-40min at the stirring speed of 250-400rpm and the temperature of 50-60 ℃; then adding polyethylene glycol and sodium alginate, stirring for 15-20min at the same temperature and the stirring speed of 1100-1300 rpm, and stopping heating;

s4 secondary stirring: cooling to 40 ℃, keeping the temperature at 40 ℃, continuing stirring, adding the plasticizer at the stirring speed of 1400-1500 rpm, and stirring for 25-35 seconds; adding white carbon black and a defoaming agent, stirring for 15-20 seconds and discharging;

s5, screw extrusion: and (3) moving the mixed material into a bin of a co-rotating double-screw extruder with the length-diameter ratio of more than 96:1, setting the processing temperature of the double-screw extruder to be 140 ℃, keeping the temperature for 3-6min after the temperature reaches the required process temperature, starting the double-screw extruder, controlling the absolute vacuum degree of the double-screw extruder to be lower than 5000Pa and the rotating speed of a main machine screw to be 100-plus-material 500rpm, and performing extrusion granulation and cooling to obtain the environment-friendly recyclable flexible packaging material.

After the environment-friendly recyclable flexible packaging material is prepared into a disposable flexible packaging film or container, the disposable flexible packaging film or container is directly recycled, and can be directly mixed and stirred in the step S4 after being thoroughly cleaned, and the step S5 is extruded for recycling.

According to the technical scheme, the environment-friendly recyclable flexible packaging material and the preparation process thereof disclosed by the invention have the following beneficial effects:

according to the environment-friendly recyclable flexible packaging material, a large amount of bio-based raw materials are used, particularly straws of crops with huge supply of waste gas in China rural areas, particularly corn straws in the bio-based materials are matched with glucan, oligomeric PVA and other bio-based materials, and the bio-based materials are fully mixed and crosslinked, so that the prepared flexible packaging material is environment-friendly, low in organic solvent content, easy to obtain raw materials and simple to prepare; the single material can be directly used for preparing a flexible packaging film or a container, the processing of compounding various materials is not needed, the cost is low, and the working procedures are few; the product has high mechanical strength, good corrosion resistance and good oxygen resistance, is easy to recycle and environment-friendly compared with a packaging material made of a composite material, and can be widely applied to the food and medicine industries.

Drawings

FIG. 1 is a flow chart of a process for preparing an environment-friendly recyclable flexible packaging material;

FIG. 2 is a flow chart of a process for preparing corn stalk fiber raw material according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

An environment-friendly recyclable flexible packaging material is characterized by being prepared from the following raw materials in parts by weight:

the glucan is yeast-beta-glucan and has the average molecular weight of 800 KD;

the straw fiber is selected from rice straw fiber, and is commercially available.

The average molecular weight of the oligomeric PVA was 15000;

the plasticizer is diphenylmethane diisocyanate: the dipropylene glycol dibenzoate is mixed according to the mass ratio of 1: 1.

The dispersing agent is prepared by mixing the following raw materials in parts by weight:

the environment-friendly recyclable flexible packaging material is prepared by the following steps as shown in the attached figure 1:

preparation of S1 raw material: preparing straw fibers, a dispersing agent and a plasticizer;

s2 air drying: respectively placing the straw fiber, the glucan and the oligomeric PVA in an air-blowing drying device for drying, wherein the oligomeric PVA and the glucan are dried until the moisture content is lower than 300ppm for later use; drying the straw fiber until the water content is lower than 2.5 percent;

s3 primary stirring: pouring the dried straw fibers, glucan and the oligomeric PVA into a mixer, adding a dispersing agent, and stirring for 25min at the stirring speed of 250rpm and the temperature of 50 ℃; then adding polyethylene glycol and sodium alginate, stirring at the same temperature and stirring speed of 1100rpm for 15min, and stopping heating;

s4 secondary stirring: cooling to 40 ℃, keeping the temperature at 40 ℃, continuing stirring, adding the plasticizer at the stirring speed of 1400rpm, and stirring for 25 seconds; adding the white carbon black and the defoaming agent, stirring for 15 seconds and discharging;

s5, screw extrusion: and (3) transferring the mixed material into a bin of a co-rotating double-screw extruder with the length-diameter ratio of more than 96:1, setting the processing temperature of the double-screw extruder to be 140 ℃, keeping the temperature for 3min after the temperature reaches the required process temperature, starting the double-screw extruder, controlling the absolute vacuum degree of the double-screw extruder to be lower than 5000Pa and the rotating speed of a main machine screw to be 100rpm, extruding, granulating and cooling to obtain the environment-friendly recyclable flexible packaging material.

Example 2

An environment-friendly recyclable flexible packaging material is characterized by being prepared from the following raw materials in parts by weight:

the glucan is yeast-beta-glucan and has the average molecular weight of 800 KD;

the straw fiber is selected from wheat straw fiber, and is commercially available.

The average molecular weight of the oligomeric PVA is 16000;

the plasticizer is diphenylmethane diisocyanate: the dipropylene glycol dibenzoate is mixed according to the mass ratio of 1: 2.

The dispersing agent is prepared by mixing the following raw materials in parts by weight:

the environment-friendly recyclable flexible packaging material is prepared by the following steps as shown in the attached drawing 1:

preparation of S1 raw material: preparing straw fibers, a dispersing agent and a plasticizer;

s2 air drying: respectively placing the straw fiber, the glucan and the oligomeric PVA in an air-blowing drying device for drying, wherein the oligomeric PVA and the glucan are dried until the moisture content is lower than 300ppm for later use; drying the straw fiber until the water content is lower than 2.5 percent;

s3 primary stirring: pouring the dried straw fibers, glucan and the oligomeric PVA into a mixer, adding a dispersing agent, and stirring for 25min at the stirring speed of 250rpm and the temperature of 50 ℃; then adding polyethylene glycol and sodium alginate, stirring at the same temperature and stirring speed of 1100rpm for 15min, and stopping heating;

s4 secondary stirring: cooling to 40 ℃, keeping the temperature at 40 ℃, continuing stirring, adding the plasticizer at the stirring speed of 1400rpm, and stirring for 25 seconds; adding the white carbon black and the defoaming agent, stirring for 15 seconds and discharging;

s5, screw extrusion: and (3) transferring the mixed material into a bin of a co-rotating double-screw extruder with the length-diameter ratio of more than 96:1, setting the processing temperature of the double-screw extruder to be 140 ℃, keeping the temperature for 3min after the temperature reaches the required process temperature, starting the double-screw extruder, controlling the absolute vacuum degree of the double-screw extruder to be lower than 5000Pa and the rotating speed of a main machine screw to be 100rpm, extruding, granulating and cooling to obtain the environment-friendly recyclable flexible packaging material.

Example 3

An environment-friendly recyclable flexible packaging material is prepared from the following raw materials in parts by weight:

the glucan is yeast-beta-glucan and has an average molecular weight of 900 KD;

the straw fiber is corn straw fiber, and is prepared by the following steps as shown in the attached figure 2:

s1 pretreatment: putting the corn straws into a crusher for crushing, and sieving the crushed corn straws with a 30-mesh sieve to obtain coarse straw materials;

s2 pre-leaching: soaking the coarse material by using potassium hydroxide with the concentration of 5% and the solid-to-liquid ratio of 1: 3; soaking at 50 deg.C for 20 min;

s3 evaporation: filtering the above raw materials, placing into a reaction kettle, steaming at high temperature, and stopping when the water content is 50%;

s4 grinding: putting the raw materials into a pulping machine for pulping to obtain straw pulp;

s5 vacuum drying: putting the straw slurry into a vacuum drier for vacuum drying, wherein the pressure is 0.002Mpa, and the temperature is 175 ℃;

s6 fine grinding: and (3) putting the straw powder after vacuum drying into a ball mill for fine grinding, sieving with a 200-mesh sieve and collecting to obtain the corn straw fiber.

The average molecular weight of the oligomeric PVA was 17000;

the plasticizer is diphenylmethane diisocyanate: the dipropylene glycol dibenzoate is mixed according to the mass ratio of 1: 13.

The dispersing agent is prepared by mixing the following raw materials in parts by weight:

the environment-friendly recyclable flexible packaging material is prepared by the following steps as shown in the attached figure 1:

preparation of S1 raw material: preparing straw fibers, a dispersing agent and a plasticizer;

s2 air drying: respectively placing the straw fiber, the glucan and the oligomeric PVA in an air-blowing drying device for drying, wherein the oligomeric PVA and the glucan are dried until the moisture content is lower than 300ppm for later use; drying the straw fiber until the water content is lower than 2.5 percent;

s3 primary stirring: pouring the dried straw fibers, glucan and the oligomeric PVA into a mixer, adding a dispersing agent, and stirring for 30min at the stirring speed of 325rpm and the temperature of 55 ℃; then adding polyethylene glycol and sodium alginate, stirring at the same temperature and the stirring speed of 1200rpm for 17min, and stopping heating;

s4 secondary stirring: cooling to 40 ℃, keeping the temperature at 40 ℃, continuing stirring, adding the plasticizer at the stirring speed of 1450rpm, and stirring for 30 seconds; adding the white carbon black and the defoaming agent, stirring for 17 seconds and discharging;

s5, screw extrusion: and (3) moving the mixed material into a bin of a co-rotating double-screw extruder with the length-diameter ratio of more than 96:1, setting the processing temperature of the double-screw extruder to be 140 ℃, keeping the temperature for 3-6min after the temperature reaches the required process temperature, starting the double-screw extruder, controlling the absolute vacuum degree of the double-screw extruder to be lower than 5000Pa and the rotating speed of a main machine screw to be 300rpm, and performing extrusion granulation and cooling to obtain the environment-friendly recyclable flexible packaging material.

Example 4

An environment-friendly recyclable flexible packaging material is characterized by being prepared from the following raw materials in parts by weight:

the glucan is yeast-beta-glucan and has an average molecular weight of 1000 KD;

the straw fiber is selected from rape straw fiber, and is commercially available;

the average molecular weight of the oligomeric PVA is 19000;

the plasticizer is diphenylmethane diisocyanate: the dipropylene glycol dibenzoate is mixed according to the mass ratio of 1: 4.

The dispersing agent is prepared by mixing the following raw materials in parts by weight:

the environment-friendly recyclable flexible packaging material is prepared by the following steps as shown in the attached figure 1:

preparation of S1 raw material: preparing straw fibers, a dispersing agent and a plasticizer;

s2 air drying: respectively placing the straw fiber, the glucan and the oligomeric PVA in an air-blowing drying device for drying, wherein the oligomeric PVA and the glucan are dried until the moisture content is lower than 300ppm for later use; drying the straw fiber until the water content is lower than 2.5 percent;

s3 primary stirring: pouring the dried straw fibers, glucan and the oligomeric PVA into a mixer, adding a dispersing agent, and stirring for 40min at the stirring speed of 400rpm and the temperature of 60 ℃; then adding polyethylene glycol and sodium alginate, stirring at the same temperature and the stirring speed of 1300rpm for 20min, and stopping heating;

s4 secondary stirring: cooling to 40 ℃, keeping the temperature at 40 ℃, continuing stirring, adding the plasticizer at the stirring speed of 1500rpm, and stirring for 35 seconds; adding white carbon black and a defoaming agent, stirring for 20 seconds and discharging;

s5, screw extrusion: and (3) transferring the mixed material into a bin of a co-rotating double-screw extruder with the length-diameter ratio of more than 96:1, setting the processing temperature of the double-screw extruder to be 140 ℃, keeping the temperature for 5min after the temperature reaches the required process temperature, starting the double-screw extruder, controlling the absolute vacuum degree of the double-screw extruder to be lower than 5000Pa and the rotating speed of a main machine screw to be 400rpm, extruding, granulating and cooling to obtain the environment-friendly recyclable flexible packaging material.

Example 5

An environment-friendly recyclable flexible packaging material is characterized by being prepared from the following raw materials in parts by weight:

the glucan is yeast-beta-glucan and has an average molecular weight of 1000 KD;

the straw fiber is selected from cotton straw fiber, and is commercially available.

The average molecular weight of the oligomeric PVA is 20000;

the plasticizer is diphenylmethane diisocyanate: the mass ratio of the dipropylene glycol dibenzoate is 1: 5, mixing the components.

The dispersing agent is prepared by mixing the following raw materials in parts by weight:

the environment-friendly recyclable flexible packaging material is prepared by the following steps as shown in the attached figure 1:

preparation of S1 raw material: preparing straw fibers, a dispersing agent and a plasticizer;

s2 air drying: respectively placing the straw fiber, the glucan and the oligomeric PVA in an air-blowing drying device for drying, wherein the oligomeric PVA and the glucan are dried until the moisture content is lower than 300ppm for later use; drying the straw fiber until the water content is lower than 2.5 percent;

s3 primary stirring: pouring the dried straw fibers, glucan and the oligomeric PVA into a mixer, adding a dispersing agent, and stirring for 40min at the stirring speed of 400rpm and the temperature of 60 ℃; then adding polyethylene glycol and sodium alginate, stirring at the same temperature and the stirring speed of 1300rpm for 20min, and stopping heating;

s4 secondary stirring: cooling to 40 ℃, keeping the temperature at 40 ℃, continuing stirring, adding the plasticizer at the stirring speed of 1500rpm, and stirring for 35 seconds; adding white carbon black and a defoaming agent, stirring for 20 seconds and discharging;

s5, screw extrusion: and (3) transferring the mixed material into a bin of a co-rotating double-screw extruder with the length-diameter ratio of more than 96:1, setting the processing temperature of the double-screw extruder to be 140 ℃, keeping the temperature for 5min after the temperature reaches the required process temperature, starting the double-screw extruder, controlling the absolute vacuum degree of the double-screw extruder to be lower than 5000Pa and the rotating speed of a main machine screw to be 500rpm, extruding, granulating and cooling to obtain the environment-friendly recyclable flexible packaging material.

Test example

Food packaging films were prepared according to the prior art using the flexible packaging materials obtained in examples 1-5 and the prior art composite material using a PET substrate + PVDC coating as comparative examples, respectively, wherein the oxygen barrier properties of the films were tested by OX2/230 oxygen transmission rate test system (available from Brand of economy, electro-mechanical technologies, Inc.) according to the standard GB/T31354-.

The test properties are shown in table 1 below.

Table 1 a table of test data is shown,

according to the data in the test example table 1, the following conclusion can be drawn that the flexible packaging material disclosed by the invention, as a flexible package prepared from a single material, has mechanical and corrosion resistance and oxygen resistance which reach or even exceed the performance of a flexible package prepared from the existing composite material, and the conclusion shows that the environment-friendly recyclable flexible packaging material disclosed by the invention can be directly recycled after being prepared into a disposable flexible packaging film or container, and can be directly mixed and stirred by using the step S4 after being thoroughly cleaned, and can be recycled by extruding in the step S5.

The above are only preferred embodiments of the present invention, and the scope of the present invention should not be limited thereby, and all the equivalent changes and modifications made by the claims and the summary of the invention should be covered by the protection scope of the present patent application.