CN113910706A - Light flame-retardant lithium battery express packaging material with strong universality and production method thereof - Google Patents
Light flame-retardant lithium battery express packaging material with strong universality and production method thereof Download PDFInfo
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- CN113910706A CN113910706A CN202111242797.2A CN202111242797A CN113910706A CN 113910706 A CN113910706 A CN 113910706A CN 202111242797 A CN202111242797 A CN 202111242797A CN 113910706 A CN113910706 A CN 113910706A
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 122
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Images
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Abstract
The invention provides a lithium battery transport packaging material which has a composite layer structure; the composite layer structure comprises a flame-retardant metal inner layer, a flame-retardant intermediate layer compounded on the flame-retardant metal inner layer, and a tear-resistant flame-retardant outer layer compounded on the flame-retardant intermediate layer. The express packaging material adopts a specific structure and material selection, has excellent flame retardant property, light weight, good tensile and tear resistance and the like, is a light and safe universal lithium battery express packaging material, and can effectively solve the problem of potential safety hazard in the express process of the conventional lithium battery. And the production process is simple, and is suitable for large-scale production and popularization.
Description
Technical Field
The invention belongs to the technical field of lithium battery express packaging, relates to a lithium battery transport packaging material and a production method thereof, and particularly relates to a light flame-retardant lithium battery express packaging material with strong universality and a production method thereof.
Background
The lithium battery is a new energy product which is developed rapidly in recent years, has small volume and large electric quantity, is used as clean energy, is widely applied to mobile phones, computers, robots and automobiles, and covers a plurality of fields of electronics and electric appliances.
With the popularization of electronic products, the application range of lithium batteries is continuously expanded, so that the transportation capacity of the lithium batteries is high. However, lithium batteries are extremely flammable, have high energy and unstable chemical composition, can explode once damaged, and belong to the ninth category of dangerous goods; large logistics enterprises and customs of all countries have set strict transportation rules for such products. The lithium battery is forbidden to be carried by the civil aviation airliner from 4 months and 1 day in 2016, and the change has a great influence on the transportation of the lithium battery by manufacturers, so that the transportation difficulty and the cost of the lithium battery are increased.
With the popularization of the internet, online shopping becomes a novel shopping form. The demand for online lithium batteries is also gradually increasing. But is limited by express transportation of lithium batteries, and large-scale development is not achieved.
Although the related logistics companies also customize special packaging schemes and execute strict transportation regulations, the related logistics companies have the problems of complicated packaging schemes, multiple packaging box specifications, poor universality, high cost and the like.
Therefore, how to develop a packaging material suitable for express transportation of lithium batteries can reduce the transportation risk of lithium batteries, and solve the problem that the packaging material is not convenient for transportation, and the packaging material becomes one of the problems to be solved urgently by domestic production enterprises and front-line researchers.
Disclosure of Invention
In view of this, the technical problem to be solved by the invention is to provide a lithium battery transport packaging material and a production method thereof, and particularly to a light flame-retardant lithium battery express packaging material with strong universality. The lithium battery transport packaging material provided by the invention has the advantages of strong universality, light weight, good flame retardance and the like, and can effectively solve the problem of potential safety hazards in the express delivery process of the conventional lithium battery. And the production process is simple, and is suitable for large-scale production and popularization.
The invention provides a lithium battery transport packaging material which has a composite layer structure;
the composite layer structure comprises a flame-retardant metal inner layer, a flame-retardant intermediate layer compounded on the flame-retardant metal inner layer, and a tear-resistant flame-retardant outer layer compounded on the flame-retardant intermediate layer.
Preferably, the tear resistant flame retardant outer layer comprises a high tensile tear resistant flame retardant outer layer;
the flame retardant intermediate layer comprises a lightweight high flame retardant intermediate layer;
the barrier flame-retardant metal inner layer comprises a barrier flame-retardant metal film inner layer;
the lithium battery transportation packaging material is a light damping flame-retardant lithium battery transportation packaging material.
Preferably, the material of the tear-resistant outer layer comprises a flame-retardant linear low-density polyethylene material;
the material of the flame retardant intermediate layer comprises a flame retardant intermediate layer foam material;
the flame retardant middle layer foam comprises a polyimide foam.
Preferably, the thickness of the tear-resistant flame-retardant outer layer is 0.05-0.1 mm;
the oxygen index of the tear-resistant flame-retardant outer layer is greater than or equal to 28%;
the puncture breaking resistance of the tear-resistant flame-retardant outer layer is greater than or equal to 12N;
the tearing force of the tearing-resistant flame-retardant outer layer is more than or equal to 5N.
Preferably, the thickness of the flame-retardant intermediate layer is 2-5 mm;
the density of the flame-retardant middle layer is 80-200 kg/m3；
The oxygen index of the flame-retardant intermediate layer is greater than or equal to 32%.
Preferably, the material of the inner layer of the flame-retardant barrier metal comprises aluminum foil;
the aluminum foil comprises an O-state aluminum foil;
the thickness of the barrier flame-retardant metal inner layer is 0.01-0.03 mm.
Preferably, an adhesive layer is arranged between the inner barrier flame-retardant metal layer and the flame-retardant intermediate layer and/or between the flame-retardant intermediate layer and the tear-resistant flame-retardant outer layer;
the adhesive for bonding comprises a polyurethane adhesive and/or a flexible epoxy resin adhesive;
the dosage of the adhesive is 20-50 g/m2；
At the junction of the flame-retardant intermediate layer and the bonding layer, adhesives are distributed in the cells of the flame-retardant intermediate layer;
the adhesive is distributed on the rough surface outside the tear-resistant flame-retardant outer layer at the joint of the tear-resistant flame-retardant outer layer and the adhesive layer;
the distribution includes forming a dendritic dispersed network structure.
Preferably, the flame retardant intermediate layer comprises a flame retardant intermediate layer of varying density;
the flame-retardant intermediate layer is formed by bonding multiple density foam materials;
the density of the flame-retardant middle layer is changed from the inner side to the outer side in a way of decreasing gradually and then increasing gradually;
the inner side density of the flame-retardant middle layer is 100-200 kg/m3；
The intermediate density of the flame-retardant intermediate layer is 50-80 kg/m3；
The outer side density of the flame-retardant middle layer is 100-200 kg/m3。
The invention provides a production method of a lithium battery transportation packaging material, which comprises the following steps:
1) adding raw materials including polyethylene main materials into an extruder, extruding to obtain a molten mass, and forming a film to obtain a tear-resistant flame-retardant outer layer of the lithium battery transport packaging material;
2) and (3) bonding the aluminum foil coated with the adhesive and the anti-tearing flame-retardant outer layer coated with the adhesive with the polyimide foam through a dry compounding process to obtain the lithium battery transport packaging material.
Preferably, the polyethylene comprises linear low density polyethylene;
the extrusion temperature is 180-210 ℃;
the film forming mode comprises casting film forming;
the film forming temperature is 230-250 ℃;
the film forming step further comprises a rolling step;
the tension of the winding is 7-10 Kg;
the temperature of the dry method composite process is 50-80 ℃;
the time of the dry compounding process is 300-600 s.
The invention provides a lithium battery transport packaging material which has a composite layer structure; the composite layer structure comprises a flame-retardant metal inner layer, a flame-retardant intermediate layer compounded on the flame-retardant metal inner layer, and a tear-resistant flame-retardant outer layer compounded on the flame-retardant intermediate layer. Compared with the prior art, the invention aims at the problem that the existing lithium ion battery has higher risk in the aspects of transportation such as express logistics and the like, and the lithium ion battery is limited from further development because the existing lithium ion battery is provided with a special transportation packaging material for the lithium ion battery in the prior art.
The invention creatively designs a lithium battery transportation packaging material, adopts a specific structure and material selection, has excellent flame retardant property, light weight, good tensile and tear resistance and the like, and is a light and safe universal lithium battery express packaging material. This lithium cell express delivery transportation packaging material comprises skin, intermediate level and inlayer three layer construction, and the intermediate level adopts light high flame retardant material to make, and the skin adopts the anti fire-retardant skin of tearing of high tensile to make, and the inlayer then adopts high separation, fire resistance membrane material. The specific intermediate layer has excellent flame retardant property, meets the requirement of UL94VO, and can form a fire retardant layer to inhibit the spread of fire. Meanwhile, the lithium battery has good compression resilience and small permanent compression deformation, and can be used as a vibration damping material for reducing vibration damage in the transportation process of the lithium battery. In addition, the paint also has the advantages of light weight, good solvent resistance, high and low temperature resistance, heat insulation, and the like; the outer layer is made of flame-retardant linear low-density polyethylene (LLDPE) material, and has the advantages of high strength, environmental stress cracking resistance, impact strength, tear strength and the like; the inner layer is made of a metal film material with barrier and flame retardant properties, and has the characteristic of light weight. The lithium battery transport packaging material provided by the invention can effectively solve the potential safety hazard problem in the express delivery process of the lithium battery at present. In addition, the packaging material provided by the invention can be made into coiled materials with different width specifications, so that lithium batteries with different specifications can be conveniently packaged and used, and the lithium batteries can be directly wound and wrapped by the packaging material and can also be wound on the outer package of the lithium batteries. And the production process is simple, and is suitable for large-scale production and popularization.
Experimental results show that after the lithium battery transport packaging coiled material provided by the invention is used for winding and wrapping 0.5kg of lithium batteries, the lithium battery packaging box is not obviously damaged after one corner, three sides and six sides of the lithium battery transport packaging coiled material are subjected to drop test according to the height of 750mm, and the lithium batteries are not damaged and can be normally used.
Drawings
FIG. 1 is a schematic diagram of the structure of a lithium battery transportation packaging material prepared by the invention.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
All of the starting materials of the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the present invention are not particularly limited in their purity, and the present invention preferably adopts the purity of industrial purity or the purity conventionally used in the field of production of transport packaging materials.
All the raw materials, the marks and the acronyms thereof belong to the conventional marks and acronyms in the field, each mark and acronym is clear and definite in the field of related application, and the raw materials can be purchased from the market or prepared by a conventional method by the technical staff in the field according to the marks, the acronyms and the corresponding application.
All the processes of the invention, the abbreviations thereof belong to the common abbreviations in the art, each abbreviation is clear and definite in the field of its associated use, and the ordinary process steps thereof can be understood by those skilled in the art from the abbreviations.
The invention provides a lithium battery transport packaging material which has a composite layer structure;
the composite layer structure comprises a flame-retardant metal inner layer, a flame-retardant intermediate layer compounded on the flame-retardant metal inner layer, and a tear-resistant flame-retardant outer layer compounded on the flame-retardant intermediate layer.
In the invention, the lithium battery transportation packaging material is preferably coiled material, can be made into coiled materials with different width specifications, is convenient for packaging and using lithium batteries with different specifications, can be directly wound and wrapped by the lithium battery transportation packaging material, and can also be wound on the outer package of the lithium battery.
In the invention, the lithium battery transportation packaging material is preferably a light-weight shock-absorption flame-retardant lithium battery transportation packaging material.
In the present invention, the tear resistant flame retardant outer layer preferably comprises a high tensile tear resistant flame retardant outer layer.
In the present invention, the material of the tear-resistant outer layer preferably comprises a flame-retardant linear low density polyethylene material.
In the invention, the thickness of the tear-resistant flame-retardant outer layer is preferably 0.05-0.1 mm, more preferably 0.06-0.09 mm, and more preferably 0.07-0.08 mm.
In the present invention, the oxygen index of the tear-resistant flame retardant outer layer is preferably equal to or greater than 28%, more preferably equal to or greater than 30%, and more preferably equal to or greater than 32%.
In the present invention, the tear-resistant flame retardant outer layer preferably has a puncture resistance of 12N or more, more preferably 14N or more, and still more preferably 16N or more.
In the present invention, the tear-resistant flame retardant outer layer preferably has a breaking force of 5N or more, more preferably 6N or more, and still more preferably 7N or more.
The outer layer of the invention is made of flame-retardant linear low-density polyethylene (LLDPE), and has the advantages of high strength, environmental stress cracking resistance, impact strength, tear strength and the like. The thickness is preferably 0.05-0.1 mm.
In the present invention, the flame-retardant intermediate layer preferably includes a lightweight highly flame-retardant intermediate layer.
In the present invention, the material of the flame-retardant intermediate layer preferably includes a flame-retardant intermediate layer foam, and more specifically, the flame-retardant intermediate layer foam preferably includes a polyimide foam.
In the invention, the thickness of the flame-retardant intermediate layer is preferably 2-5 mm, more preferably 2.5-4.5 mm, and more preferably 3-4 mm.
In the invention, the density of the flame-retardant intermediate layer is preferably 80-200 kg/m3More preferably 100 to 180kg/m3More preferably 120 to 160kg/m3。
In the present invention, the oxygen index of the flame-retardant intermediate layer is preferably 32% or more, more preferably 34% or more, and preferably 36% or more.
In the present invention, the flame retardant intermediate layer preferably includes a flame retardant intermediate layer of varying density.
In the present invention, the flame retardant intermediate layer is preferably bonded by a plurality of density foam materials.
In the present invention, the density of the flame-retardant intermediate layer preferably changes from inside to outside in a decreasing and then increasing manner.
In the invention, the inner side density of the flame-retardant middle layer is preferably 100-200 kg/m3More preferably 120 to 180kg/m3More preferably 140 to 160kg/m3。
In the present invention, the intermediate density of the flame-retardant intermediate layer is preferably 50～80kg/m3More preferably 55 to 75kg/m3More preferably 60 to 70kg/m3。
In the invention, the outer side density of the flame-retardant intermediate layer is preferably 100-200 kg/m3More preferably 120 to 180kg/m3More preferably 140 to 160kg/m3。
The intermediate layer in the present invention is particularly selected to be made of Polyimide (PI) foam. The PI foam is a high polymer foaming material with an imide ring structure on a main chain, has excellent flame retardant property, meets the requirement of UL94VO, can form a fire retardant layer when meeting fire, and inhibits the spread of fire. Meanwhile, the PI foam has good compression resilience and small permanent compression deformation, and can be used as a vibration damping material for reducing vibration damage in the transportation process of the lithium battery. In addition, the PI foam also has the advantages of light weight, good solvent resistance, high and low temperature resistance, heat insulation and the like. In addition, in consideration of certain mechanical strength and vibration reduction requirements, the density and the thickness of the PI foam of the middle layer are moderate, and the density is preferably 80-200 kg/m3(ii) a The thickness is preferably 2-5 mm.
In the present invention, the barrier flame-retardant metal inner layer preferably includes a barrier flame-retardant metal thin film inner layer. In the invention, the inner layer is a layer of express packaging material close to the lithium battery.
In the present invention, the material of the inner layer of barrier flame-retardant metal preferably includes aluminum foil.
In the present invention, the aluminum foil preferably includes an O-state aluminum foil.
In the invention, the thickness of the barrier flame-retardant metal inner layer is preferably 0.01-0.03 mm, more preferably 0.014-0.026 mm, and more preferably 0.018-0.022 mm.
In the present invention, the inner layer of barrier flame retardant metal preferably has an adhesive layer between it and the flame retardant intermediate layer and/or between it and the outer tear resistant flame retardant layer.
In the present invention, the means of compounding preferably includes adhesion.
In the present invention, the adhesive for bonding preferably includes a polyurethane adhesive and/or a flexible epoxy adhesive, and more preferably a polyurethane adhesive or a flexible epoxy adhesive.
In the invention, the dosage of the adhesive is preferably 20-50 g/m2More preferably 25 to 45g/m2More preferably 30 to 40g/m2。
The invention is bonded between the outer layer and the middle layer and between the middle layer and the inner layer by polyurethane adhesive or flexible epoxy resin adhesive with large applicable temperature difference, the flexibility can greatly eliminate the stress when winding and wrapping, and simultaneously can bear the alternate test of cold and hot environments. The dosage of the adhesive is preferably 20-50 g/m2。
In the invention, at the junction of the flame-retardant intermediate layer and the bonding layer, the bonding agent is preferably distributed in the cells of the flame-retardant intermediate layer.
In the invention, at the junction of the tear-resistant flame-retardant outer layer and the bonding layer, a bonding agent is preferably distributed on the rough surface outside the tear-resistant flame-retardant outer layer.
In the present invention, the distribution preferably includes forming a dendritic dispersion network structure.
In the invention, at the junction of the flame-retardant intermediate layer and the bonding layer, the bonding agent is preferably distributed in the cells of the flame-retardant intermediate layer. And at the joint of the light flame-retardant outer layer and the bonding layer, the adhesive is preferably distributed on the rough surface of the light flame-retardant outer layer. In particular, the distribution preferably includes forming a dendritic dispersed network structure. Specifically, the network structure is more preferably a 3D network structure. In the joint of the adhesive layer and the foam material, the adhesive is also distributed in the foam holes and the rough surface, and is distributed in the foam holes and the rough surface in a dendritic form, so that a 3D dendritic adhesive network can be formed, and after the adhesive network is combined with the foam holes or the foam material body, the impact resistance of the packaging material can be further improved, and the interlayer bonding strength can be greatly increased.
The invention is particularly bonded between the outer layer and the middle layer and between the middle layer and the inner layer through polyurethane adhesive or flexible epoxy resin adhesive with large applicable temperature difference, and the flexibility is large, so that the invention can bear the alternation of cold and hot environments in the transportation processAnd (6) checking. The amount of the adhesive is preferably 20-50 g/m2。
The invention provides an express packaging material for a lithium battery. The middle layer is made of light high-flame-retardant polyimide foam, the outer layer is made of high-tensile, tear-resistant and flame-retardant linear low-density polyethylene (LLDPE) materials, and the inner layer is made of high-barrier and flame-retardant aluminum foil. The outer layer, the middle layer and the inner layer are bonded and compounded through the polyurethane adhesive or the flexible epoxy resin, so that the packaging material is a light and safe universal lithium battery express packaging material, and the potential safety hazard problem existing in the express process of the conventional lithium battery can be effectively solved.
The invention also provides a production method of the lithium battery transportation packaging material, which comprises the following steps:
1) adding raw materials including polyethylene main materials into an extruder, extruding to obtain a molten mass, and forming a film to obtain a tear-resistant flame-retardant outer layer of the lithium battery transport packaging material;
2) and (3) bonding the aluminum foil coated with the adhesive and the anti-tearing flame-retardant outer layer coated with the adhesive with the polyimide foam through a dry compounding process to obtain the lithium battery transport packaging material.
The raw materials including the polyethylene main material are added into an extruder, a molten mass is obtained after extrusion, and then the tear-resistant flame-retardant outer layer of the lithium battery transport packaging material is obtained after film forming.
In the present invention, the polyethylene preferably comprises linear low density polyethylene.
In the invention, the extrusion temperature is preferably 180-210 ℃, more preferably 185-205 ℃, and more preferably 190-200 ℃.
In the present invention, the film formation means preferably includes casting film formation.
In the invention, the film forming temperature is preferably 230-250 ℃, more preferably 233-248 ℃, more preferably 235-245 ℃, and more preferably 238-243 ℃.
In the present invention, it is preferable that the method further comprises a winding step after the film formation. Specifically, the tension of the winding is preferably 7-10 Kg, more preferably 7.5-9.5 Kg, and more preferably 8-9 Kg.
Finally, the aluminum foil coated with the adhesive and the anti-tearing flame-retardant outer layer coated with the adhesive are bonded with the polyimide foam through a dry compounding process to obtain the lithium battery transport packaging material.
In the invention, the temperature of the dry-method composite process is preferably 50-80 ℃, more preferably 55-75 ℃, and more preferably 60-70 ℃.
In the invention, the time of the dry compounding process is preferably 300-600 s, more preferably 350-550 s, and more preferably 400-500 s.
The invention integrates and refines the whole production process, and better ensures the performance of the express packaging material of the lithium battery, and the production method specifically comprises the following steps:
cutting PI foam into required thickness by using a sponge disc horizontal cutting machine for later use;
adding a material taking polyethylene as a main material into a double-screw extruder, and extruding under high pressure to obtain a molten mass; then, casting the mixture by a casting machine to form a film, and rolling the film under certain tension to obtain the anti-tear flame-retardant outer layer of the lithium battery transport packaging material;
coating adhesives with a certain adhesive amount on the tear-resistant flame-retardant outer layer aluminum foil and the tear-resistant flame-retardant inner layer aluminum foil respectively in a gravure coating mode;
and compounding the outer layer and the inner layer coated with the adhesive with the PI foam in the middle layer by a dry compounding process to obtain the lithium battery transportation packaging material. And during rolling, simultaneously removing the flash with the edge of 5mm on line to form the light flame-retardant lithium battery express packaging material with strong universality.
Referring to fig. 1, fig. 1 is a schematic cross-sectional structure diagram of a lithium battery transportation packaging material prepared by the present invention. Wherein, 1 is an aluminum foil inner layer, 2 is an adhesive layer, 3 is a PI foam middle layer, 4 is an adhesive layer, and 5 is a flame-retardant LLDPE outer layer.
The lithium battery transportation packaging material adopts a specific structure and material selection, has excellent flame retardant property, light weight, good tensile and tear resistance and the like, and is a light and safe universal lithium battery express packaging material. This lithium cell express delivery transportation packaging material comprises skin, intermediate level and inlayer three layer construction, and the intermediate level adopts light high flame retardant material to make, and the skin adopts the anti fire-retardant skin of tearing of high tensile to make, and the inlayer then adopts high separation, fire resistance membrane material. The specific intermediate layer has excellent flame retardant property, meets the requirement of UL94VO, and can form a fire retardant layer to inhibit the spread of fire. Meanwhile, the lithium battery has good compression resilience and small permanent compression deformation, and can be used as a vibration damping material for reducing vibration damage in the transportation process of the lithium battery. In addition, the paint also has the advantages of light weight, good solvent resistance, high and low temperature resistance, heat insulation, and the like; the outer layer is made of flame-retardant linear low-density polyethylene (LLDPE) material, and has the advantages of high strength, environmental stress cracking resistance, impact strength, tear strength and the like; the inner layer is made of a metal film material with barrier and flame retardant properties, and has the characteristic of light weight. The lithium battery transport packaging material provided by the invention can effectively solve the potential safety hazard problem in the express delivery process of the lithium battery at present. In addition, the packaging material provided by the invention can be made into coiled materials with different width specifications, so that lithium batteries with different specifications can be conveniently packaged and used, and the lithium batteries can be directly wound and wrapped by the packaging material and can also be wound on the outer package of the lithium batteries. And the production process is simple, and is suitable for large-scale production and popularization.
Experimental results show that after the lithium battery transport packaging coiled material provided by the invention is used for winding and wrapping 0.5kg of lithium batteries, the lithium battery packaging box is not obviously damaged after one corner, three sides and six sides of the lithium battery transport packaging coiled material are subjected to drop test according to the height of 750mm, and the lithium batteries are not damaged and can be normally used.
For further illustration of the present invention, the present invention provides a lithium battery transportation packaging material and a method for producing the same, which is described in detail with reference to the following examples, but it should be understood that the examples are implemented on the premise of the technical solution of the present invention, and the detailed embodiments and specific operation procedures are given only for further illustration of the features and advantages of the present invention, not for limitation of the claims of the present invention, and the scope of protection of the present invention is not limited to the following examples.
Example 1
Production process of battery express packaging material:
cutting the foam into 1mm by using a sponge disc horizontal cutting machine for the packaging material, and bonding and compounding the foam into 3mm middle layers with different density gradients for later use;
adding a material taking polyethylene as a main material into a double-screw extruder, and extruding under high pressure to obtain a molten mass; then casting the mixture into a film by a casting machine, and rolling the film under certain tension to obtain a tear-resistant flame-retardant outer layer of the lithium battery transport packaging material with the thickness of 0.09 mm;
respectively coating 30g/m of aluminum foil on the outer layer and the inner layer by adopting a gravure coating mode2The adhesive of (1);
the outer layer and the inner layer coated with the adhesive are compounded with the middle layer through a dry compounding process, and fins with the edge of 5mm are removed on line during rolling, so that the light flame-retardant lithium battery express packaging material with strong universality is formed.
Specifically, the density of the product is 80kg/m at a thickness of 1mm3The polyimide foam was bonded on both sides with a thickness of 1mm and a density of 160kg/m, respectively3Forming a middle layer of the packaging material with the thickness of 3mm for standby;
putting linear low-density polyethylene with an oxygen index of 28% into a double-screw extruder, firstly melting at 190 ℃, then casting to form a film through a casting machine at 235 ℃, and rolling under the tension of 8Kg to prepare a packaging material outer layer with the thickness of 0.09 mm;
coating 30g/m on the outer layer and the inner layer of the packaging material by adopting a gravure coating mode2The adhesive of (1);
and (3) laminating the outer layer and the inner layer of the packaging material coated with the adhesive and the middle layer of the packaging material at the temperature of 60 ℃ for 420 seconds, and then combining the two layers together to form the express packaging material for the lithium battery.
The performance of the express packaging material for the light lithium battery prepared in the embodiment 1 of the invention is detected.
The tensile strength of the express packaging material of the lithium battery is determined by adopting the test standard of GB/T13022; the puncture resistance was determined using the annex C test standard of BB/T0024.
The detection result shows that the light lithium battery express packaging material prepared by the invention has the tensile strength of 7.5N and the puncture resistance of 16.5N; the material has high strength and good wrapping retention. Wrap up 0.5kg lithium cell in the winding, after according to 750mm high "one corner, trilateral, six face" drop test, the packing box has not obviously damaged, and built-in lithium cell also has not damaged and can normal use, and shock resistance is excellent.
Example 2
Production process of battery express packaging material:
cutting the foam into 1mm by using a sponge disc horizontal cutting machine for the packaging material, and bonding and compounding the foam into 3mm middle layers with different density gradients for later use;
adding a material taking polyethylene as a main material into a double-screw extruder, and extruding under high pressure to obtain a molten mass; then casting the mixture into a film by a casting machine, and rolling the film under certain tension to obtain a 0.08 mm-thick anti-tear flame-retardant outer layer of the lithium battery transport packaging material;
respectively coating 30g/m of aluminum foil on the outer layer and the inner layer by adopting a gravure coating mode2The adhesive of (1);
the outer layer and the inner layer coated with the adhesive are compounded with the middle layer through a dry compounding process, and fins with the edge of 5mm are removed on line during rolling, so that the light flame-retardant lithium battery express packaging material with strong universality is formed.
Specifically, the density of the product is 60kg/m at a thickness of 1mm3The polyimide foam of which both sides are respectively bonded with a thickness of 1mm and a density of 150kg/m3Forming a middle layer of the packaging material with the thickness of 3mm for standby;
putting linear low-density polyethylene with an oxygen index of 28% into a double-screw extruder, firstly melting at 190 ℃, then casting to form a film by a casting machine at 235 ℃, and rolling under the tension of 8.5Kg to prepare a packaging material outer layer with the thickness of 0.08 mm;
coating the outer layer and the inner layer of the packaging material by adopting a gravure coating modeCloth 30g/m2The adhesive of (1);
and (3) laminating the outer layer and the inner layer of the packaging material coated with the adhesive and the middle layer of the packaging material at the temperature of 60 ℃ for 420 seconds, and then combining the two layers together to form the express packaging material for the lithium battery.
The performance of the express packaging material for the light lithium battery prepared in the embodiment 2 of the invention is detected.
The tensile strength of the express packaging material of the lithium battery is determined by adopting the test standard of GB/T13022; the puncture resistance was determined using the annex C test standard of BB/T0024.
The detection result shows that the light lithium battery express packaging material prepared by the invention has the tensile strength of 6N and the puncture resistance of 15N; the material has high strength and good wrapping retention. Wrap up 0.5kg lithium cell in the winding, after according to 750mm high "one corner, trilateral, six face" drop test, the packing box has not obviously damaged, and built-in lithium cell also has not damaged and can normal use, and shock resistance is excellent.
Example 3
Production process of battery express packaging material:
cutting the foam into 1mm and 2mm by using a sponge disc horizontal cutting machine, and bonding and compounding into 4mm middle layers with different density gradients for later use;
adding a material taking polyethylene as a main material into a double-screw extruder, and extruding under high pressure to obtain a molten mass; then casting the mixture into a film by a casting machine, and rolling the film under certain tension to obtain a 0.08 mm-thick anti-tear flame-retardant outer layer of the lithium battery transport packaging material;
coating 30g/m on the outer layer and the inner layer respectively by adopting a gravure coating mode2The adhesive of (1);
the outer layer and the inner layer coated with the adhesive are compounded with the middle layer through a dry compounding process, and fins with the edge of 5mm are removed on line during rolling, so that the light flame-retardant lithium battery express packaging material with strong universality is formed.
Specifically, the density of the steel plate is 70kg/m at the thickness of 2mm3The polyimide foam was bonded on both sides with a thickness of 1mm and a density of 160kg/m, respectively3Is polymerized byImide foam to form a 3mm thick intermediate layer of the packaging material for later use;
putting linear low-density polyethylene with an oxygen index of 28% into a double-screw extruder, firstly melting at 190 ℃, then casting to form a film by a casting machine at 235 ℃, and rolling under the tension of 8.5Kg to prepare a packaging material outer layer with the thickness of 0.08 mm;
coating 40g/m on the outer layer and the inner layer of the packaging material by adopting a gravure coating mode2The adhesive of (1);
and laminating the outer layer and the inner layer of the packaging material coated with the adhesive and the middle layer of the packaging material at the temperature of 60 ℃ for 480s, and then combining the two layers together to form the express packaging material for the lithium battery.
The performance of the express packaging material for the light lithium battery prepared in the embodiment 3 of the invention is detected.
The tensile strength of the express packaging material of the lithium battery is determined by adopting the test standard of GB/T13022; the puncture resistance was determined using the annex C test standard of BB/T0024.
The detection result shows that the light lithium battery express packaging material prepared by the invention has the tensile strength of 6N and the puncture resistance of 16N; the material has high strength and good wrapping retention. Wrap up 0.5kg lithium cell in the winding, after according to 750mm high "one corner, trilateral, six face" drop test, the packing box has not obviously damaged, and built-in lithium cell also has not damaged and can normal use, and shock resistance is excellent.
The above detailed description of the present invention provides a lightweight flame retardant lithium battery express packaging material with strong versatility and a method for producing the same, and the present invention is described in detail by using specific examples, which are provided herein to help understanding the method and the core concept of the present invention, including the best mode, and also to enable any person skilled in the art to practice the present invention, including making and using any devices or systems and performing any combination of the methods. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention. The scope of the invention is defined by the claims and may include other embodiments that occur to those skilled in the art. Such other embodiments are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal languages of the claims.
Claims (10)
1. The lithium battery transport packaging material is characterized in that the transport packaging material has a composite layer structure;
the composite layer structure comprises a flame-retardant metal inner layer, a flame-retardant intermediate layer compounded on the flame-retardant metal inner layer, and a tear-resistant flame-retardant outer layer compounded on the flame-retardant intermediate layer.
2. The lithium battery transport packaging material of claim 1, wherein the tear resistant flame retardant outer layer comprises a high tensile tear resistant flame retardant outer layer;
the flame retardant intermediate layer comprises a lightweight high flame retardant intermediate layer;
the barrier flame-retardant metal inner layer comprises a barrier flame-retardant metal film inner layer;
the lithium battery transportation packaging material is a light damping flame-retardant lithium battery transportation packaging material.
3. The lithium battery transport package material as recited in claim 1, wherein the material of the tear-resistant outer layer comprises a flame retardant linear low density polyethylene material;
the material of the flame retardant intermediate layer comprises a flame retardant intermediate layer foam material;
the flame retardant middle layer foam comprises a polyimide foam.
4. The lithium battery transportation packaging material as claimed in claim 1, wherein the tear-resistant flame-retardant outer layer has a thickness of 0.05-0.1 mm;
the oxygen index of the tear-resistant flame-retardant outer layer is greater than or equal to 28%;
the puncture breaking resistance of the tear-resistant flame-retardant outer layer is greater than or equal to 12N;
the tearing force of the tearing-resistant flame-retardant outer layer is more than or equal to 5N.
5. The lithium battery transportation packaging material as claimed in claim 1, wherein the thickness of the flame-retardant intermediate layer is 2-5 mm;
the density of the flame-retardant middle layer is 80-200 kg/m3；
The oxygen index of the flame-retardant intermediate layer is greater than or equal to 32%.
6. The lithium battery transportation packaging material of claim 1, wherein the material of the inner layer of barrier flame retardant metal comprises aluminum foil;
the aluminum foil comprises an O-state aluminum foil;
the thickness of the barrier flame-retardant metal inner layer is 0.01-0.03 mm.
7. The lithium battery transportation packaging material of claim 1, wherein an adhesive layer is arranged between the inner barrier flame retardant metal layer and the flame retardant intermediate layer and/or between the flame retardant intermediate layer and the tear-resistant flame retardant outer layer;
the adhesive for bonding comprises a polyurethane adhesive and/or a flexible epoxy resin adhesive;
the dosage of the adhesive is 20-50 g/m2；
At the junction of the flame-retardant intermediate layer and the bonding layer, adhesives are distributed in the cells of the flame-retardant intermediate layer;
the adhesive is distributed on the rough surface outside the tear-resistant flame-retardant outer layer at the joint of the tear-resistant flame-retardant outer layer and the adhesive layer;
the distribution includes forming a dendritic dispersed network structure.
8. The lithium battery transportation packaging material of claim 1, wherein the flame retardant intermediate layer comprises a flame retardant intermediate layer of varying density;
the flame-retardant intermediate layer is formed by bonding multiple density foam materials;
the density of the flame-retardant middle layer is changed from the inner side to the outer side in a way of decreasing gradually and then increasing gradually;
the inner side density of the flame-retardant middle layer is 100-200 kg/m3；
The intermediate density of the flame-retardant intermediate layer is 50-80 kg/m3；
The outer side density of the flame-retardant middle layer is 100-200 kg/m3。
9. The production method of the lithium battery transportation packaging material is characterized by comprising the following steps:
1) adding raw materials including polyethylene main materials into an extruder, extruding to obtain a molten mass, and forming a film to obtain a tear-resistant flame-retardant outer layer of the lithium battery transport packaging material;
2) and (3) bonding the aluminum foil coated with the adhesive and the anti-tearing flame-retardant outer layer coated with the adhesive with the polyimide foam through a dry compounding process to obtain the lithium battery transport packaging material.
10. The production method according to claim 9, wherein the polyethylene comprises linear low density polyethylene;
the extrusion temperature is 180-210 ℃;
the film forming mode comprises casting film forming;
the film forming temperature is 230-250 ℃;
the film forming step further comprises a rolling step;
the tension of the winding is 7-10 Kg;
the temperature of the dry method composite process is 50-80 ℃;
the time of the dry compounding process is 300-600 s.
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