A heat-sealable flexible antistatic high-barrier shielding packaging material and preparation method and application thereof

Abstract

The application discloses a heat-sealable flexible anti-static high-barrier shielding packaging material and a preparation method and application thereof, and belongs to the technical field of packaging materials. The packaging material comprises, from outside to inside, a PET layer, a black ink anti-static agent layer, an aluminum foil layer, a double-cold-cathode nylon layer and a permanent anti-static polyethylene layer; the permanent anti-static polyethylene layer is a three-layer co-extrusion structure comprising, from outside to inside, a polyethylene outer layer, a polyethylene middle layer and a heat-sealable anti-static layer. The product obtained by compounding the specific materials has excellent tensile property, flexibility and strength, and the inner surface resistance value of the heat-sealable flexible anti-static high-barrier shielding packaging material is 10 6 ‑10 10 Ω, which meets the national military standard GJB2605-96. The heat-sealable flexible anti-static high-barrier shielding packaging material can be used for packaging liquid explosive with high explosion, and then the liquid explosive is loaded into the warhead of a missile.

Description

Technical Field

[0001] This invention belongs to the field of packaging materials technology, and relates to a heat-sealable, flexible, antistatic, high-barrier packaging material, its preparation method, and its application. Background Technology

[0002] Antistatic shielding aluminum-plastic composite packaging material, as an outer packaging material, can be used for the outer packaging of missile electronic components and radar elements. It provides antistatic shielding, preventing interference from external radiation. This material plays a crucial role because once missile electronic components and radar elements are subjected to interference from electromagnetic waves or static electricity, their internal parameters will change, causing deviations, altering the missile's trajectory, and rendering the radar inoperable. Current antistatic shielding aluminum-plastic composite packaging materials involve coating the outside of an antistatic coating with a composite foamed slurry. This protective layer provides good cushioning against external impacts and punctures. An inner nylon film prevents damage to the aluminum foil layer from internal objects.

[0003] However, existing technologies have only studied the outer packaging materials for missile electronic components, radar elements, etc. There is currently no material that can package high-explosive liquid explosives. Liquid explosives cannot be directly loaded into the warhead of a missile. They need to be sealed in a packaging bag made of packaging material before being loaded into the warhead of the missile.

[0004] Therefore, how to develop a heat-sealable, flexible, anti-static, high-barrier packaging material that can be used to pack high-explosive liquid explosives into missile warheads and meets national military standards is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the present invention provides a heat-sealable, flexible, antistatic, high-barrier shielding packaging material, its preparation method, and its application.

[0006] A heat-sealable, flexible, antistatic, high-barrier packaging material includes, from the outside in, a PET layer, a black ink antistatic agent layer, an aluminum foil layer, a double corona-treated nylon layer, and a permanent antistatic polyethylene layer; the permanent antistatic polyethylene layer is a three-layer co-extruded structure, including, from the outside in, a polyethylene outer layer, a polyethylene middle layer, and a heat-sealable antistatic layer.

[0007] Furthermore, the thickness of the PET layer is 0.12 μm, the thickness of the black ink antistatic agent layer is 0.01-0.02 μm, the thickness of the aluminum foil layer is 0.007 μm, the thickness of the double corona nylon layer is 0.15 μm, the thickness of the permanent antistatic polyethylene layer is 0.09 μm; the total thickness of the polyethylene outer layer and the polyethylene middle layer is 0.08 μm, and the thickness of the heat-sealed antistatic layer is 0.01 μm.

[0008] Furthermore, the aforementioned black ink antistatic agent layer comprises black ink and an antistatic agent, wherein the mass ratio of the black ink to the antistatic agent is 1:1.

[0009] The beneficial effects of adopting the above-mentioned further technical solutions are as follows: the black ink plays a role in avoiding reflection; the above-mentioned antistatic agent and black ink are compounded together, and the two have good compatibility; moreover, the addition of the antistatic agent improves the antistatic resistance value of the PET layer.

[0010] Furthermore, the dyne value on the inner side of the PET layer is 45-50D, the dyne value on both sides of the aluminum foil layer is 50-60D, the dyne value on both sides of the double corona-electrode nylon layer is 50-55D, and the dyne value on the outer side of the permanent antistatic polyethylene layer is 38-56D.

[0011] The beneficial effects of adopting the above-mentioned further technical solutions are: achieving the above-mentioned dyne value, each layer of material can be better coated, improving the tear strength and toughness of the product, and meeting the requirements of composite coating.

[0012] Furthermore, the aforementioned heat-sealed antistatic layer comprises the following components in parts by weight: 90-110 parts plastic, 20-35 parts diatomaceous earth, 20-28 parts graphite with a purity of 99% or higher, 0.5-1.3 parts dispersant, 2-4 parts defoamer, and 3-5 parts thickener.

[0013] The beneficial effects of adopting the above-mentioned further technical solution are as follows: The heat-sealable antistatic layer is placed inside the polyethylene layer. Carbon molecules are permanent and do not volatilize, forming an antistatic value on the semiconductor surface, thus preventing static electricity generation. The carbon molecules are uniformly distributed on the inner surface of the permanent antistatic polyethylene layer, releasing static electricity through these molecules. However, carbon molecules are conductive, and the outer surface of the permanent antistatic polyethylene layer requires corona treatment to achieve a dyne value of 38-56D. Therefore, the permanent antistatic polyethylene layer is easily broken down during the corona treatment process, leading to film failure. The above-mentioned heat-sealable antistatic layer composition solves this technical problem, obtaining a permanent antistatic polyethylene layer without product loss during the corona treatment process.

[0014] Furthermore, the aforementioned plastic is composed of the following parts by weight of raw materials: 30-35 parts of plastic with grade 0220, 30-35 parts of plastic with grade 2426, and 30-40 parts of plastic with grade 1520.

[0015] Furthermore, the aforementioned polyethylene outer layer is composed of plastic with grade 7042 and plastic with grade 2426, with a mass ratio of 7042 plastic to 2426 plastic of 1:1; the aforementioned polyethylene middle layer is composed of plastic with grade 7042, plastic with grade 2426 and metallocene plastic with grade 2018, with a mass ratio of 7042 plastic, 2426 plastic and 2018 metallocene plastic of 1:1:0.5.

[0016] Furthermore, the surface resistance of the PET layer after the addition of the black ink antistatic agent layer is 10 Ω. 8 -10 10 Ω, the inner surface resistance of the aforementioned permanent antistatic polyethylene layer is 10. 6 -10 10 Ω, the surface resistivity of the inner surface of the above heat-sealable, flexible, antistatic, high-barrier shielding packaging material is 10 Ω. 6 -10 10 Ω.

[0017] The beneficial effects of adopting the above-mentioned further technical solution are: by setting a black ink antistatic agent layer and a permanent antistatic polyethylene layer, the antistatic value of the product is improved.

[0018] The present invention also provides a method for preparing the above-mentioned heat-sealable, flexible, antistatic, high-barrier packaging material, characterized by comprising the following steps:

[0019] (1) After coating the PET layer with black ink antistatic agent, apply glue to the surface of the black ink antistatic agent layer, put it into an oven to dry, and then laminate aluminum foil on a dry laminating machine.

[0020] (2) Apply glue to the surface of the aluminum foil layer, dry it in an oven, and then laminate double corona nylon using a dry laminating machine.

[0021] (3) The mixture of polyethylene outer layer, polyethylene middle layer and heat-sealed antistatic layer is added to the twin screw extruder for melting. Each melt is combined in the die of the three-layer co-extrusion device through its own flow channel. After co-extrusion through the die, and extrusion and cooling by the cooling roller, a permanent antistatic polyethylene layer is obtained.

[0022] (4) Apply glue to the surface of the double corona nylon layer, dry it in an oven, and then laminate a permanent antistatic polyethylene layer using a dry laminating machine. After high-temperature curing, the above-mentioned heat-sealable, flexible, antistatic, high-barrier shielding packaging material is obtained.

[0023] Furthermore, in steps (1)-(2) and (3), the amount of glue applied in each step is 3g / m of dry glue. 2 .

[0024] The beneficial effects of adopting the above-mentioned further technical solutions are: further improving the composite strength of each layer of materials.

[0025] Furthermore, in steps (1)-(2) and (3), each step involves feeding the product into an oven for drying. The drying oven consists of four sections and is set to temperatures of 40°C, 50°C, 60°C, and 70°C. In each step, the temperature of the hot roller in the dry laminating machine is set to 80°C, and the laminating pressure is 6 kg.

[0026] The beneficial effects of adopting the above-mentioned further technical solutions are: further improving the composite strength of each layer of materials.

[0027] Furthermore, in step (3), the extruder temperature is set as follows: barrel temperature (°C): 200, 220, 240, 270; die head temperature (°C): 270, 260, 250.

[0028] Furthermore, in step (4), the curing temperature is 50℃ and the curing time is 72h.

[0029] The beneficial effects of adopting the above-mentioned further technical solutions are: further improving the composite strength of each layer of materials.

[0030] Furthermore, in step (2), the preparation method of the above-mentioned heat-sealing antistatic layer mixture includes the following steps: mixing and kneading the components of the heat-sealing antistatic layer to obtain the antistatic layer mixture, the kneading temperature is 180℃, and the kneading time is 15min.

[0031] The present invention also provides an application of the above-mentioned heat-sealable flexible antistatic high-barrier shielding packaging material or the heat-sealable flexible antistatic high-barrier shielding packaging material prepared by the above method in the internal packaging of high explosive liquid explosives in missile warheads.

[0032] The beneficial effects of this invention are:

[0033] In this invention, the PET layer has the following characteristics: moisture-proof, high barrier, and anti-oxidation. After being coated with a black ink antistatic agent layer, its surface antistatic value reaches 10. 8 -10 10 Ω, but this material is relatively brittle and hard.

[0034] Aluminum foil layer characteristics: high barrier, anti-oxidation shielding, UV protection, but this material is relatively brittle.

[0035] Features of double corona-treated nylon layer: tensile strength, moisture resistance, oxidation resistance, and good flexibility.

[0036] Characteristics of the permanent antistatic polyethylene layer: It is a three-layer co-extruded material. The outer polyethylene layer is used for corona discharge. The outer and middle polyethylene layers improve the tensile strength and heat resistance of the product. The heat-sealing antistatic layer improves the heat-sealing properties, flexibility, and tensile strength of the product. Carbon molecules are evenly distributed on the inner surface of the product, and the inner resistance value can reach 10. 6 -10 10 Ω.

[0037] This product, made from the aforementioned specific composite materials, possesses excellent tensile strength, flexibility, and strength. It is heat-sealable, flexible, anti-static, and a high-barrier shielding packaging material with a surface resistivity of 10 Ω·cm. 6 -10 10 Ω, conforms to the national military standard GJB2605-96.

[0038] This invention relates to a heat-sealable, flexible, anti-static, high-barrier shielding packaging material that can be used for packaging high-explosive liquid explosives without the need for non-woven fabric. The liquid explosives are then loaded into the warhead of a missile. This invention has been developed, improved, and tested over eight years by a military enterprise and is now officially available for supply.

[0039] The preparation method of this invention is simple, convenient to operate, and suitable for large-scale production and application. Detailed Implementation

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] The antistatic agent used in the embodiments of this invention is: product model JL-WTA, manufactured by Shandong Juli Antistatic Technology Co., Ltd.

[0042] The dispersant is N-hydroxymethylacrylamide;

[0043] The defoamer is calcium oxide;

[0044] Thickener: Hydroxyethyl cellulose.

[0045] The adhesive product model is NOVACOTE SF-7688+CA7957, and the manufacturer is Singapore COVAX Asia Pacific Ltd.

[0046] Example 1

[0047] The heat-sealable, flexible, antistatic, high-barrier packaging material comprises, from the outside in, a PET layer, a black ink antistatic agent layer, an aluminum foil layer, a double corona-treated nylon layer, and a permanent antistatic polyethylene layer; the permanent antistatic polyethylene layer is a three-layer co-extruded structure comprising, from the outside in, an outer polyethylene layer, a middle polyethylene layer, and a heat-sealable antistatic layer.

[0048] The thickness of the PET layer is 0.12μm, the thickness of the black ink antistatic agent layer is 0.01μm, the thickness of the aluminum foil layer is 0.007μm, the thickness of the double corona-treated nylon layer is 0.15μm, the thickness of the permanent antistatic polyethylene layer is 0.09μm; the total thickness of the polyethylene outer layer and the polyethylene middle layer is 0.08μm, and the thickness of the heat-sealed antistatic layer is 0.01μm.

[0049] The black ink antistatic agent layer consists of black ink and an antistatic agent, with a mass ratio of black ink to antistatic agent of 1:1.

[0050] The dyne value on the inner side of the PET layer is 45D, the dyne value on both sides of the aluminum foil layer is 50D, the dyne value on both sides of the double corona-electrode nylon layer is 50D, and the dyne value on the outer side of the permanent antistatic polyethylene layer is 38D.

[0051] The heat-sealed antistatic layer comprises the following components in parts by weight: 30 parts of plastic with grade 0220, 30 parts of plastic with grade 2426, 30 parts of plastic with grade 1520, 20 parts of diatomaceous earth, 20 parts of graphite with a purity of 99% or higher, 0.5 parts of dispersant, 2 parts of defoamer, and 3 parts of thickener.

[0052] The outer layer of polyethylene is composed of plastic of grade 7042 and plastic of grade 2426, with a mass ratio of 1:1; the middle layer of polyethylene is composed of plastic of grade 7042, plastic of grade 2426 and metallocene plastic of grade 2018, with a mass ratio of 1:1:0.5.

[0053] Example 2

[0054] The heat-sealable, flexible, antistatic, high-barrier packaging material comprises, from the outside in, a PET layer, a black ink antistatic agent layer, an aluminum foil layer, a double corona-treated nylon layer, and a permanent antistatic polyethylene layer; the permanent antistatic polyethylene layer is a three-layer co-extruded structure comprising, from the outside in, an outer polyethylene layer, a middle polyethylene layer, and a heat-sealable antistatic layer.

[0055] The thickness of the PET layer is 0.12μm, the thickness of the black ink antistatic agent layer is 0.02μm, the thickness of the aluminum foil layer is 0.007μm, the thickness of the double corona-treated nylon layer is 0.15μm, the thickness of the permanent antistatic polyethylene layer is 0.09μm; the total thickness of the polyethylene outer layer and the polyethylene middle layer is 0.08μm, and the thickness of the heat-sealed antistatic layer is 0.01μm.

[0056] The black ink antistatic agent layer consists of black ink and an antistatic agent, with a mass ratio of black ink to antistatic agent of 1:1.

[0057] The dyne value on the inner side of the PET layer is 48D, the dyne value on both sides of the aluminum foil layer is 55D, the dyne value on both sides of the double corona-electrode nylon layer is 53D, and the dyne value on the outer side of the permanent antistatic polyethylene layer is 45D.

[0058] The heat-sealed antistatic layer comprises the following components in parts by weight: 32 parts of plastic with grade 0220, 33 parts of plastic with grade 2426, 35 parts of plastic with grade 1520, 28 parts of diatomaceous earth, 24 parts of graphite with a purity of 99% or higher, 1.0 part of dispersant, 3 parts of defoamer, and 4 parts of thickener.

[0059] The outer layer of polyethylene is composed of plastic of grade 7042 and plastic of grade 2426, with a mass ratio of 1:1; the middle layer of polyethylene is composed of plastic of grade 7042, plastic of grade 2426 and metallocene plastic of grade 2018, with a mass ratio of 1:1:0.5.

[0060] Example 3

[0061] The heat-sealable, flexible, antistatic, high-barrier packaging material comprises, from the outside in, a PET layer, a black ink antistatic agent layer, an aluminum foil layer, a double corona-treated nylon layer, and a permanent antistatic polyethylene layer; the permanent antistatic polyethylene layer is a three-layer co-extruded structure comprising, from the outside in, an outer polyethylene layer, a middle polyethylene layer, and a heat-sealable antistatic layer.

[0062] The thickness of the PET layer is 0.12μm, the thickness of the black ink antistatic agent layer is 0.02μm, the thickness of the aluminum foil layer is 0.007μm, the thickness of the double corona-treated nylon layer is 0.15μm, the thickness of the permanent antistatic polyethylene layer is 0.09μm; the total thickness of the polyethylene outer layer and the polyethylene middle layer is 0.08μm, and the thickness of the heat-sealed antistatic layer is 0.01μm.

[0063] The black ink antistatic agent layer consists of black ink and an antistatic agent, with a mass ratio of black ink to antistatic agent of 1:1.

[0064] The dyne value on the inner side of the PET layer is 50D, the dyne value on both sides of the aluminum foil layer is 60D, the dyne value on both sides of the double corona-electrode nylon layer is 55D, and the dyne value on the outer side of the permanent antistatic polyethylene layer is 56D.

[0065] The heat-sealed antistatic layer comprises the following components in parts by weight: 35 parts of plastic with grade 0220, 35 parts of plastic with grade 2426, 40 parts of plastic with grade 1520, 35 parts of diatomaceous earth, 28 parts of graphite with a purity of 99% or higher, 1.3 parts of dispersant, 4 parts of defoamer, and 5 parts of thickener.

[0066] The outer layer of polyethylene is composed of plastic of grade 7042 and plastic of grade 2426, with a mass ratio of 1:1; the middle layer of polyethylene is composed of plastic of grade 7042, plastic of grade 2426 and metallocene plastic of grade 2018, with a mass ratio of 1:1:0.5.

[0067] The heat-sealable, flexible, antistatic, high-barrier shielding packaging materials in Examples 1-3 are prepared using the same method, which includes the following steps:

[0068] (1) After coating the PET layer with black ink antistatic agent, apply glue to the surface of the black ink antistatic agent layer and send it into a drying oven consisting of 4 drying ovens to dry. The temperature of the drying oven is set to 40℃, 50℃, 60℃ and 70℃ in sequence. Then, aluminum foil is laminated on a dry laminating machine with the hot roller temperature set to 80℃ and the laminating pressure to 6kg.

[0069] (2) Apply glue to the surface of the aluminum foil layer and dry it in a drying oven consisting of 4 drying ovens. The temperature of the drying oven is set to 40℃, 50℃, 60℃ and 70℃ in sequence. Then, use a dry laminating machine to laminate double corona nylon. The temperature of the hot roller is set to 80℃ and the laminating pressure is 6kg.

[0070] (3) The preparation method of the antistatic layer mixture includes the following steps: mixing and kneading the components of the antistatic layer to obtain the antistatic layer mixture, the kneading temperature is 180℃ and the kneading time is 15min.

[0071] The mixture of polyethylene outer layer, polyethylene middle layer and heat-sealed antistatic layer is added to a twin-screw extruder for melting. The melts are combined in the die of the three-layer co-extrusion device through their respective flow channels and co-extruded through the die. After being squeezed and cooled by the cooling roller, a permanent antistatic polyethylene layer is obtained. The extruder temperature is set as follows: barrel temperature (°C): 200, 220, 240, 270; die temperature (°C): 270, 260, 250.

[0072] (4) Apply glue to the surface of the double corona nylon layer and dry it in a drying oven consisting of 4 drying ovens. The temperature of the drying oven is set to 40℃, 50℃, 60℃ and 70℃ in sequence. Then, use a dry laminating machine to laminate a permanent antistatic polyethylene layer. The temperature of the hot roller is set to 80℃, the laminating pressure is 6kg, and the material is cured at high temperature of 50℃ for 72h to obtain a heat-sealable, flexible, antistatic, high-barrier shielding packaging material.

[0073] The high-explosive liquid explosive is loaded into a sealed packaging bag made of heat-sealable, flexible, anti-static, high-barrier shielding packaging material as described in Examples 1-3, and then placed inside the missile warhead.

[0074] Table 1 Performance Test Table

[0075]

[0076]

[0077] The description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat-sealable, flexible, antistatic, high-barrier shielding packaging material for packaging high-explosive liquid explosives inside missile warheads, characterized in that, It includes, from the outside in, a PET layer, a black ink antistatic agent layer, an aluminum foil layer, a double corona-treated nylon layer, and a permanent antistatic polyethylene layer; the permanent antistatic polyethylene layer is a three-layer co-extruded structure, including, from the outside in, a polyethylene outer layer, a polyethylene middle layer, and a heat-sealed antistatic layer; The black ink antistatic agent layer comprises black ink and antistatic agent, wherein the mass ratio of black ink to antistatic agent is 1:

1. The heat-sealing antistatic layer comprises the following components in parts by weight: 90-110 parts plastic, 20-35 parts diatomaceous earth, 20-28 parts graphite with a purity of 99% or higher, 0.5-1.3 parts dispersant, 2-4 parts defoamer, and 3-5 parts thickener. The dyne value inside the PET layer is 45-50 dynes, the dyne value on both sides of the aluminum foil layer is 50-60 dynes, the dyne value on both sides of the double corona-electrode nylon layer is 50-55 dynes, and the dyne value on the outside of the permanent antistatic polyethylene layer is 38-56 dynes. The surface resistance of the PET layer after the black ink antistatic agent layer is applied is 10. 8 -10 10 Ω, the inner surface resistance of the permanent antistatic polyethylene layer is 10. 6 -10 10 Ω, the inner surface resistivity of the heat-sealable, flexible, antistatic, high-barrier shielding packaging material is 10 Ω. 6 -10 10 Ω.

2. A method for preparing the heat-sealable, flexible, antistatic, high-barrier shielding packaging material according to claim 1, characterized in that, Includes the following steps: (1) After coating the PET layer with black ink antistatic agent, apply glue to the surface of the black ink antistatic agent layer, put it into the oven to dry, and then laminate aluminum foil on a dry laminating machine. (2) Apply glue to the surface of the aluminum foil layer, dry it in an oven, and then laminate double corona nylon using a dry laminating machine; (3) The mixture of polyethylene outer layer, polyethylene middle layer and heat-sealed antistatic layer is added to the twin screw extruder for melting. Each melt is combined in the die of the three-layer co-extrusion device through its own flow channel. After co-extrusion through the die, it is squeezed and cooled by the cooling roller to obtain a permanent antistatic polyethylene layer. (4) Apply glue to the surface of the double corona nylon layer, dry it in an oven, and then laminate a permanent antistatic polyethylene layer using a dry laminating machine. Cure it at 50°C to obtain the heat-sealable, flexible, antistatic, high-barrier packaging material.

3. The method for preparing a heat-sealable, flexible, antistatic, high-barrier shielding packaging material according to claim 2, characterized in that, In steps (1)-(2) and (4), the amount of glue applied in each step is 3g / m of dry glue. 2 .

4. The method for preparing a heat-sealable, flexible, antistatic, high-barrier shielding packaging material according to claim 2, characterized in that, In steps (1)-(2) and (4), each step involves drying in an oven consisting of four sections; the oven temperatures are set sequentially to 40℃, 50℃, 60℃ and 70℃.

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