Air seal type large packaging bag film and preparation method thereof

Abstract

The invention belongs to the technical field of high polymer materials, and particularly relates to an air seal type large packaging bag film and a preparation method thereof. In order to solve the problem that in the prior art, the heat sealing performance of a PE film material needs to be further improved, the large packaging bag film used for air sealing and the preparation method of the large packaging bag film are provided, the large packaging bag film comprises an outer layer, a middle layer and an inner layer which are sequentially connected, and the outer layer, the middle layer and the inner layer all comprise functional master batches added with nano graphene. The invention provides a three-layer film structure added with the nano graphene functional master batch, and nano graphene has extremely high heat conduction performance, so that the heat sealing efficiency and the heat sealing strength of the film are further improved after the nano graphene functional master batch is added.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer materials, and in particular relates to a large air-sealed packaging bag film and a preparation method thereof. Background Art

[0002] Food packaging bags are a type of packaging design. In order to preserve and store food in our daily life, product packaging bags are produced. Food packaging bags refer to film containers that are in direct contact with food and are used to hold and protect food. In the prior art, food packaging such as FFS heavy bags for rice are mainly made of PP material. Compared with PE material, it has poor heat sealing performance and relatively high cost. Therefore, the development of a recyclable PE material air-sealed large packaging bag film is a market demand, which is energy-saving, environmentally friendly and sustainable.

[0003] For example, a Chinese invention patent application discloses a color-developing polyethylene film, a packaging bag, and a color-developing reagent strip [application number: CN202410553480.8]. The invention application includes an outer layer, an intermediate layer, and an inner layer; the outer layer is composed of a low-density polyethylene resin and a linear low-density polyethylene resin; the intermediate layer includes the low-density polyethylene resin and / or the linear low-density polyethylene resin; the intermediate layer also includes an acid-base indicator; the mass proportion of the acid-base indicator in the intermediate layer is 1%-3%; the inner layer is composed of at least two of the low-density polyethylene, the linear low-density polyethylene, and the metallocene linear low-density polyethylene.

[0004] This invention application has the advantage of reflecting whether the pH value of the package contents has changed by the color change of the color-developing polyethylene film, thereby more accurately judging whether the package contents have deteriorated, but its heat sealing performance still needs to be improved. Summary of the invention

[0005] The object of the present invention is to provide a large air-sealed packaging bag film and a preparation method thereof in view of the above problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A large air-sealed packaging bag film comprises an outer layer, an intermediate layer and an inner layer which are connected in sequence, wherein the outer layer, the intermediate layer and the inner layer all comprise a functional masterbatch added with nanographene.

[0008] In the above-mentioned large packaging bag film for air-sealing type, the outer layer comprises 90-95 parts by weight of high-stiffness polyethylene and 5-10 parts by weight of functional masterbatch.

[0009] In the above-mentioned large packaging bag film for air-sealing type, the outer layer comprises 93 parts by weight of high-stiffness polyethylene and 7 parts by weight of functional masterbatch.

[0010] In the above-mentioned large packaging bag film for airtight type, the intermediate layer comprises 35-65 parts by weight of high-density polyethylene, 35-65 parts by weight of low-density polyethylene and 5-10 parts by weight of functional masterbatch.

[0011] In the above-mentioned large packaging bag film for airtight type, the middle layer comprises 48 parts by weight of high-density polyethylene, 46 parts by weight of low-density polyethylene and 6 parts by weight of functional masterbatch.

[0012] In the above-mentioned large packaging bag film for airtight type, the inner layer comprises 30-40 parts by weight of ethylene-vinyl acetate copolymer, 50-60 parts by weight of metallocene polyethylene and 5-10 parts by weight of functional masterbatch.

[0013] In the above-mentioned large packaging bag film for airtight type, the inner layer comprises 36 parts by weight of ethylene-vinyl acetate copolymer, 56 parts by weight of metallocene polyethylene and 8 parts by weight of functional masterbatch.

[0014] In the above-mentioned large packaging bag film for airtight type, the functional masterbatch includes 20-30 parts by weight of anti-ultraviolet additive, 20-30 parts by weight of antistatic agent, 20-30 parts by weight of opening agent, 5-10 parts by weight of lubricant, 10-20 parts by weight of masterbatch and 1-5 parts by weight of nano-graphene.

[0015] In the above-mentioned large packaging bag film for airtight type, the total thickness of the outer layer, the middle layer and the inner layer is 0.08-0.14 mm, and the thickness ratio of the outer layer, the middle layer and the inner layer is 28:44:28.

[0016] A method for preparing the above-mentioned large packaging bag film for airtight type comprises the following steps:

[0017] Step 1: According to the components contained in each layer, measure the feeding ratio of each component respectively, mix them evenly and put them into a three-layer co-extrusion film blowing machine. The die spacing of the three-layer co-extrusion film blowing machine is 1.4mm;

[0018] Step 2: After melting, co-extrusion, blowing, cooling, shaping and winding, the finished film is obtained.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] 1. The present invention provides a three-layer film structure with nanographene functional masterbatch added. Nanographene has extremely high thermal conductivity, and after addition, the heat sealing efficiency and heat sealing strength of the film are further improved.

[0021] 2. The process flow of the present invention is simple, the raw materials are cheap and easily available, and it is suitable for large-scale promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of the invention;

[0023] In the figure: outer layer 1, middle layer 2, inner layer 3. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] Example 1

[0026] The present embodiment provides a large packaging bag film for airtight type and a preparation method thereof, the large packaging bag film for airtight type comprises an outer layer 1, an intermediate layer 2 and an inner layer 3 connected in sequence, wherein the outer layer 1 comprises 90 parts by weight of high-stiffness polyethylene and 10 parts by weight of a functional masterbatch; the intermediate layer 2 comprises 35 parts by weight of high-density polyethylene, 65 parts by weight of low-density polyethylene and 10 parts by weight of a functional masterbatch; the inner layer 3 comprises 30 parts by weight of ethylene-vinyl acetate copolymer, 60 parts by weight of metallocene polyethylene and 10 parts by weight of a functional masterbatch.

[0027] The functional masterbatch includes 20 parts by weight of anti-ultraviolet additive, 30 parts by weight of antistatic agent, 30 parts by weight of opening agent, 10 parts by weight of lubricant, 20 parts by weight of masterbatch and 5 parts by weight of nano-graphene.

[0028] The high-stiffness polyethylene uses ExxonMobil 3505MC, the high-density polyethylene uses Borouge FB5600, the low-density polyethylene uses Yangzi Petrochemical 2420D, the ethylene-vinyl acetate copolymer uses Yangzi Petrochemical V5110J, the anti-UV additive uses ultraviolet absorber UV-1577, the antistatic agent uses Primate VLA55, the anti-blocking agent uses Shulman F15 anti-blocking agent, and the lubricating agent uses oleic acid amide.

[0029] The bulk bag film is prepared by the following method:

[0030] Step 1: According to the components contained in each layer, measure the feeding ratio of each component respectively, mix them evenly and put them into a three-layer co-extrusion film blowing machine. The die spacing of the three-layer co-extrusion film blowing machine is 1.4mm;

[0031] Step 2: After melting, co-extrusion, blowing, cooling, shaping and winding, the finished film is obtained.

[0032] In this embodiment, the total thickness of the finished film is 0.08 mm, and the thickness ratio of the outer layer 1, the middle layer 2 and the inner layer 3 is 28:44:28.

[0033] The heat sealing was carried out at 120°C and for 1 second, and the heat sealing fastness of the finished film was measured to be 19N / 15mm.

[0034] Example 2

[0035] The present embodiment provides a large packaging bag film for airtight type and a preparation method thereof, the large packaging bag film for airtight type comprises an outer layer 1, an intermediate layer 2 and an inner layer 3 connected in sequence, wherein the outer layer 1 comprises 95 parts by weight of high-stiffness polyethylene and 5 parts by weight of a functional masterbatch; the intermediate layer 2 comprises 65 parts by weight of high-density polyethylene, 35 parts by weight of low-density polyethylene and 5 parts by weight of a functional masterbatch; the inner layer 3 comprises 40 parts by weight of ethylene-vinyl acetate copolymer, 50 parts by weight of metallocene polyethylene and 5 parts by weight of a functional masterbatch.

[0036] The functional masterbatch includes 30 parts by weight of anti-ultraviolet additives, 20 parts by weight of antistatic agents, 20 parts by weight of anti-opening agents, 5 parts by weight of lubricants, 10 parts by weight of masterbatches and 1 part by weight of nano-graphene.

[0037] The high-stiffness polyethylene uses ExxonMobil 3505MC, the high-density polyethylene uses Borouge FB5600, the low-density polyethylene uses Yangzi Petrochemical 2420D, the ethylene-vinyl acetate copolymer uses Yangzi Petrochemical V5110J, the anti-UV additive uses ultraviolet absorber UV-1577, the antistatic agent uses Primate VLA55, the anti-blocking agent uses Shulman F15 anti-blocking agent, and the lubricating agent uses oleic acid amide.

[0038] The bulk bag film is prepared by the following method:

[0039] Step 1: According to the components contained in each layer, measure the feeding ratio of each component respectively, mix them evenly and put them into a three-layer co-extrusion film blowing machine. The die spacing of the three-layer co-extrusion film blowing machine is 1.4mm;

[0040] Step 2: After melting, co-extrusion, blowing, cooling, shaping and winding, the finished film is obtained.

[0041] In this embodiment, the total thickness of the finished film is 0.14 mm, and the thickness ratio of the outer layer 1, the middle layer 2 and the inner layer 3 is 28:44:28.

[0042] The heat sealing was carried out at 120°C and for 1 second, and the heat sealing fastness of the finished film was measured to be 20N / 15mm.

[0043] Example 3

[0044] The present embodiment provides a large packaging bag film for airtight type and a preparation method thereof, the large packaging bag film for airtight type comprises an outer layer 1, an intermediate layer 2 and an inner layer 3 connected in sequence, wherein the outer layer 1 comprises 93 parts by weight of high-stiffness polyethylene and 7 parts by weight of a functional masterbatch; the intermediate layer 2 comprises 48 parts by weight of high-density polyethylene, 46 parts by weight of low-density polyethylene and 6 parts by weight of a functional masterbatch; the inner layer 3 comprises 36 parts by weight of ethylene-vinyl acetate copolymer, 56 parts by weight of metallocene polyethylene and 8 parts by weight of a functional masterbatch.

[0045] The functional masterbatch includes 25 parts by weight of anti-ultraviolet additive, 25 parts by weight of antistatic agent, 25 parts by weight of anti-opening agent, 8 parts by weight of lubricant, 15 parts by weight of masterbatch and 3 parts by weight of nano-graphene.

[0046] The high-stiffness polyethylene uses ExxonMobil 3505MC, the high-density polyethylene uses Borouge FB5600, the low-density polyethylene uses Yangzi Petrochemical 2420D, the ethylene-vinyl acetate copolymer uses Yangzi Petrochemical V5110J, the anti-UV additive uses ultraviolet absorber UV-1577, the antistatic agent uses Primate VLA55, the anti-blocking agent uses Shulman F15 anti-blocking agent, and the lubricating agent uses oleic acid amide.

[0047] The bulk bag film is prepared by the following method:

[0048] Step 1: According to the components contained in each layer, measure the feeding ratio of each component respectively, mix them evenly and put them into a three-layer co-extrusion film blowing machine. The die spacing of the three-layer co-extrusion film blowing machine is 1.4mm;

[0049] Step 2: After melting, co-extrusion, blowing, cooling, shaping and winding, the finished film is obtained.

[0050] In this embodiment, the total thickness of the finished film is 0.1 mm, and the thickness ratio of the outer layer 1, the middle layer 2 and the inner layer 3 is 28:44:28.

[0051] The heat sealing was carried out at 120°C and for 1 second, and the heat sealing fastness of the finished film was measured to be 20N / 15mm.

[0052] Comparative Example 1

[0053] The present comparative example provides a large packaging bag film for airtight type and a preparation method thereof, the large packaging bag film for airtight type comprises an outer layer 1, an intermediate layer 2 and an inner layer 3 connected in sequence, wherein the outer layer 1 comprises 93 parts by weight of high-stiffness polyethylene and 7 parts by weight of a functional masterbatch; the intermediate layer 2 comprises 48 parts by weight of high-density polyethylene, 46 parts by weight of low-density polyethylene and 6 parts by weight of a functional masterbatch; the inner layer 3 comprises 36 parts by weight of ethylene-vinyl acetate copolymer, 56 parts by weight of metallocene polyethylene and 8 parts by weight of a functional masterbatch.

[0054] The functional masterbatch includes 25 parts by weight of an anti-ultraviolet additive, 25 parts by weight of an antistatic agent, 25 parts by weight of an anti-blocking agent, 8 parts by weight of a lubricating agent and 15 parts by weight of a color masterbatch.

[0055] The high-stiffness polyethylene uses ExxonMobil 3505MC, the high-density polyethylene uses Borouge FB5600, the low-density polyethylene uses Yangzi Petrochemical 2420D, the ethylene-vinyl acetate copolymer uses Yangzi Petrochemical V5110J, the anti-UV additive uses ultraviolet absorber UV-1577, the antistatic agent uses Primate VLA55, the anti-blocking agent uses Shulman F15 anti-blocking agent, and the lubricating agent uses oleic acid amide.

[0056] The bulk bag film is prepared by the following method:

[0057] Step 1: According to the components contained in each layer, measure the feeding ratio of each component respectively, mix them evenly and put them into a three-layer co-extrusion film blowing machine. The die spacing of the three-layer co-extrusion film blowing machine is 1.4mm;

[0058] Step 2: After melting, co-extrusion, blowing, cooling, shaping and winding, the finished film is obtained.

[0059] In this embodiment, the total thickness of the finished film is 0.1 mm, and the thickness ratio of the outer layer 1, the middle layer 2 and the inner layer 3 is 28:44:28.

[0060] The heat sealing was carried out at 120°C and for 1 second, and the heat sealing fastness of the finished film was measured to be 12N / 15mm.

[0061] Comparative Example 2

[0062] The present comparative example provides a large packaging bag film for airtight type and a preparation method thereof, the large packaging bag film for airtight type comprises an outer layer 1, an intermediate layer 2 and an inner layer 3 connected in sequence, wherein the outer layer 1 comprises 93 parts by weight of high-stiffness polyethylene and 7 parts by weight of a functional masterbatch; the intermediate layer 2 comprises 48 parts by weight of high-density polyethylene, 46 parts by weight of low-density polyethylene and 6 parts by weight of a functional masterbatch; the inner layer 3 comprises 36 parts by weight of ethylene-vinyl acetate copolymer, 56 parts by weight of metallocene polyethylene and 8 parts by weight of a functional masterbatch.

[0063] The functional masterbatch includes 25 parts by weight of anti-ultraviolet additive, 25 parts by weight of antistatic agent, 25 parts by weight of anti-opening agent, 8 parts by weight of lubricant, 15 parts by weight of masterbatch and 0.2 parts by weight of nano-graphene.

[0064] The high-stiffness polyethylene uses ExxonMobil 3505MC, the high-density polyethylene uses Borouge FB5600, the low-density polyethylene uses Yangzi Petrochemical 2420D, the ethylene-vinyl acetate copolymer uses Yangzi Petrochemical V5110J, the anti-UV additive uses ultraviolet absorber UV-1577, the antistatic agent uses Primate VLA55, the anti-blocking agent uses Shulman F15 anti-blocking agent, and the lubricating agent uses oleic acid amide.

[0065] The bulk bag film is prepared by the following method:

[0066] Step 1: According to the components contained in each layer, measure the feeding ratio of each component respectively, mix them evenly and put them into a three-layer co-extrusion film blowing machine. The die spacing of the three-layer co-extrusion film blowing machine is 1.4mm;

[0067] Step 2: After melting, co-extrusion, blowing, cooling, shaping and winding, the finished film is obtained.

[0068] In this embodiment, the total thickness of the finished film is 0.1 mm, and the thickness ratio of the outer layer 1, the middle layer 2 and the inner layer 3 is 28:44:28.

[0069] The heat sealing was carried out at 120°C and for 1 second, and the heat sealing fastness of the finished film was measured to be 12N / 15mm.

[0070] Comparative Example 3

[0071] The present comparative example provides a large packaging bag film for airtight type and a preparation method thereof, the large packaging bag film for airtight type comprises an outer layer 1, an intermediate layer 2 and an inner layer 3 connected in sequence, wherein the outer layer 1 comprises 93 parts by weight of high-stiffness polyethylene and 7 parts by weight of a functional masterbatch; the intermediate layer 2 comprises 48 parts by weight of high-density polyethylene, 46 parts by weight of low-density polyethylene and 6 parts by weight of a functional masterbatch; the inner layer 3 comprises 36 parts by weight of ethylene-vinyl acetate copolymer, 56 parts by weight of metallocene polyethylene and 8 parts by weight of a functional masterbatch.

[0072] The functional masterbatch includes 25 parts by weight of an anti-ultraviolet additive, 25 parts by weight of an antistatic agent, 25 parts by weight of an opening agent, 8 parts by weight of a lubricant, 15 parts by weight of a masterbatch and 10 parts by weight of nano-graphene.

[0073] The high-stiffness polyethylene uses ExxonMobil 3505MC, the high-density polyethylene uses Borouge FB5600, the low-density polyethylene uses Yangzi Petrochemical 2420D, the ethylene-vinyl acetate copolymer uses Yangzi Petrochemical V5110J, the anti-UV additive uses ultraviolet absorber UV-1577, the antistatic agent uses Primate VLA55, the anti-blocking agent uses Shulman F15 anti-blocking agent, and the lubricating agent uses oleic acid amide.

[0074] The bulk bag film is prepared by the following method:

[0075] Step 1: According to the components contained in each layer, measure the feeding ratio of each component respectively, mix them evenly and put them into a three-layer co-extrusion film blowing machine. The die spacing of the three-layer co-extrusion film blowing machine is 1.4mm;

[0076] Step 2: After melting, co-extrusion, blowing, cooling, shaping and winding, the finished film is obtained.

[0077] In this embodiment, the total thickness of the finished film is 0.1 mm, and the thickness ratio of the outer layer 1, the middle layer 2 and the inner layer 3 is 28:44:28.

[0078] The heat sealing was carried out at 120°C and for 1 second, and the heat sealing fastness of the finished film was measured to be 14N / 15mm.

[0079] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0080] Although the terms such as outer layer 1, middle layer 2, inner layer 3 are used more frequently in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A large air-sealed packaging bag film, comprising an outer layer (1), an intermediate layer (2) and an inner layer (3) connected in sequence, characterized in that: The outer layer (1), the middle layer (2) and the inner layer (3) all include a functional masterbatch added with nanographene.

2. A large air-sealed packaging bag film as claimed in claim 1, characterized in that: The outer layer (1) comprises 90-95 parts by weight of high stiffness polyethylene and 5-10 parts by weight of functional masterbatch.

3. A large air-sealed packaging bag film as claimed in claim 2, characterized in that: The outer layer (1) comprises 93 parts by weight of high-stiffness polyethylene and 7 parts by weight of functional masterbatch.

4. The large air-sealed packaging bag film according to claim 1, characterized in that: The intermediate layer (2) comprises 35-65 parts by weight of high-density polyethylene, 35-65 parts by weight of low-density polyethylene and 5-10 parts by weight of a functional masterbatch.

5. A large air-sealed packaging bag film as claimed in claim 4, characterized in that: The intermediate layer (2) comprises 48 parts by mass of high-density polyethylene, 46 parts by mass of low-density polyethylene and 6 parts by mass of functional masterbatch.

6. The large air-sealed packaging bag film according to claim 1, characterized in that: The inner layer (3) comprises 30-40 parts by weight of ethylene-vinyl acetate copolymer, 50-60 parts by weight of metallocene polyethylene and 5-10 parts by weight of functional masterbatch.

7. A large air-sealed packaging bag film as claimed in claim 6, characterized in that: The inner layer (3) comprises 36 parts by weight of ethylene-vinyl acetate copolymer, 56 parts by weight of metallocene polyethylene and 8 parts by weight of functional masterbatch.

8. The large air-sealed packaging bag film according to claim 1, characterized in that: The functional masterbatch comprises 20-30 parts by weight of an anti-ultraviolet additive, 20-30 parts by weight of an antistatic agent, 20-30 parts by weight of an anti-blocking agent, 5-10 parts by weight of a lubricant, 10-20 parts by weight of a masterbatch and 1-5 parts by weight of nanographene.

9. The large air-sealed packaging bag film according to claim 1, characterized in that: The total thickness of the outer layer (1), the middle layer (2) and the inner layer (3) is 0.08-0.14 mm, and the thickness ratio of the outer layer (1), the middle layer (2) and the inner layer (3) is 28:44:

28.

10. A method for preparing a large air-sealed packaging bag film as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: According to the components contained in each layer, measure the feeding ratio of each component respectively, mix them evenly and put them into a three-layer co-extrusion film blowing machine. The die spacing of the three-layer co-extrusion film blowing machine is 1.4mm; Step 2: After melting, co-extrusion, blowing, cooling, shaping and winding, the finished film is obtained.

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