CN109370203A - A kind of lithium battery flexible packaging outer layer membrane material and its preparation process - Google Patents
A kind of lithium battery flexible packaging outer layer membrane material and its preparation process Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2377/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2377/06—Polyamides derived from polyamines and polycarboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2477/00—Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers
- C08J2477/06—Polyamides derived from polyamines and polycarboxylic acids
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Abstract
The invention discloses a kind of lithium battery flexible packaging outer layer membrane materials and its preparation process, the material is made of nylon, polyester and other auxiliary agent blending and modifyings, each component proportion are as follows: nylon is 1~1.5 times of the mass fraction of polyester, slipping agent is the 3% of nylon and polyester gross mass number, plasticizer is the 15% of nylon and polyester gross mass number, antioxidant is the 0.5% of nylon and polyester gross mass number, and expanding material is the 25% of nylon and polyester gross mass number.Present invention obtains excellent aqueous vapor barrier property and acid resistance, water absorption rate is low and thermal stability is good, is suitable for long term storage, has both the excellent characteristics of nylon material.
Description
Technical field
The invention belongs to novel film materials technical field, in particular to a kind of lithium battery flexible packaging outer layer membrane material and its
Preparation process.
Background technique
Lithium battery flexible packaging material is generally plastic-aluminum combined membrane structure, is by aluminium foil, a variety of plastics and adhesive or modification
A kind of composite material that the multiple materials such as resin collectively constitute undertakes in protection lithium battery primarily as li battery shell
The effect of portion's structure.
For nylon material because it is with very high mechanical strength, coefficient of friction is lower, and self-lubrication is good, and softening point is high, wear-resisting
Damage, resistance to common solvent, electrical insulating property is good, and numerous excellent performances such as nontoxic free from extraneous odour are often adopted as lithium battery flexible packaging
Outer layer protection layer material.However, containing a large amount of amino and imino group in strand since nylon is polyamide polymer
Hydrophilic radical, therefore water imbibition is larger, saturated water content can reach 3% or more, this will affect material to a certain extent
Dimensional stability, electrical property and mechanical strength etc., therefore to the more demanding of storage environment.And the acid resistance of nylon compared with
Difference, can be to lithium battery Soft Roll if there is electrolyte to touch lithium battery flexible packaging material nylon face accidentally in cell processing course
The overall performance of package material produces a very large impact.Further, since at present of home make nylon film in technology and processing all
Have the defects that certain, so that lithium battery flexible packaging material scouring depth spread in performance is uneven, scouring depth depth is more than 5mm and unabroken
Lithium battery flexible packaging material is extremely rare in the domestic market.
For nylon material because it is with very high mechanical strength and puncture resistance, coefficient of friction is lower, and self-lubrication is good, soft
Change point height, wear-resistant, resistance to common solvent, electrical insulating property is good, numerous excellent performances such as nontoxic free from extraneous odour, and membrane material is by conduct
Packaging material is widely used in the fields such as food, chemical industry, medicine, machinery and electronics, in occupation of very in high molecular material
Consequence is often widely used as outer layer protection layer material in lithium battery flexible packaging.
However, since nylon is polyamide polymer, in strand containing a large amount of hydrophilic radical amide groups (-
NHCO -), water imbibition is larger, and saturated water content can reach 3% or more, this can seriously affect the dimensional stability of material, electricity
Performance and mechanical strength etc., and should not store in hot and humid environment, it is more demanding to storage environment.And due to nylon material
In amido bond it is unstable under acidic condition, it may occur that hydrolysis, in cell processing course, if there is electrolyte to touch accidentally
Lithium battery flexible packaging material nylon face can generate corrosion to lithium battery flexible packaging material, influence the overall performance of lithium battery.Cause
This, it is high for developing a lithium battery flexible packaging haveing excellent performance technology content needed for outer layer membrane material.
Summary of the invention
Goal of the invention of the invention be to provide it is a kind of there is low water to breathe freely rate, low water absorption and good acid resistance,
And it is provided simultaneously with the novel lithium battery flexible package outer layer membrane material and its preparation process of nylon material excellent characteristics.
Polyester material be it is a kind of have excellent performance, widely used engineering plastics, there is the excellent oxygen resistance that blocks water, good
Acid resistance and dimensional stability, the present invention is by being made a kind of novel lithium for nylon material and polyester material blending and modifying
There is low water to breathe freely rate, water absorption rate and good acid resistance for battery flexible package outer layer membrane material, the material, and simultaneously
Has nylon material excellent characteristics.
The technical problem to be solved by the present invention is to what is be achieved through the following technical solutions:
A kind of battery flexible package outer layer membrane material, which is characterized in that the material is the blending and modifying of nylon and polyester
Material is made, each component proportion are as follows: Buddhist nun of nylon and polyester and slipping agent, plasticizer, antioxidant, expanding material blending
Dragon: polyester=1:1~3:2, slipping agent are the 3% of nylon and polyester gross mass number, and plasticizer is nylon and the total matter of polyester
The 15% of number is measured, antioxidant is the 0.5% of nylon and polyester gross mass number, and expanding material is nylon and polyester gross mass part
Several 25%.
The nylon is selected from one or more of nylon 6, nylon66 fiber, nylon 610, nylon 1010, Nylon 1012；
The polyester is selected from one or both of polyethylene terephthalate, polybutylene terephthalate；
The slipping agent is selected from stearmide, erucyl amide, oleamide, N, N '-ethylene bis stearamide, behenic acid acyl
One of amine；
The plasticizer is selected from phthalate, terephthalic acid ester, fatty acid ester, epoxies, alkyl sulphur
One of vinegar class；
The antioxidant is selected from DBPC 2,6 ditertiary butyl p cresol, dibutyl hydroxy toluene, tert-butyl hydroquinone, butyl
Hydroxyanisole, N- phenylacetyl group-L-Glutamine, one kind of 2,6 di tert butyl 4 methyl phenol；
The expanding material is selected from one of silane coupling agent, epoxies；
In addition, the present invention also provides a kind of lithium battery flexible packaging preparation process of outer layer membrane material, the preparation process
Steps are as follows:
Preliminary drying: each component raw material is weighed by above-mentioned mass parts ratio:
Wherein, the nylon material need to be in convection oven in 90-100 DEG C of preliminary drying 10h, and the polyester material need to be in air blast
In 100-110 DEG C of preliminary drying 8h in baking oven, other auxiliary agents need to be in convection oven in 80-100 DEG C of preliminary drying 5h；
Melting extrusion: the raw material being baked in advance are put into double screw extruder, each processing district of double screw extruder
Section parameter is respectively as follows: first segment feed zone temperature: 209-211 DEG C, second segment feed zone temperature: 229-231 DEG C, first segment melts
Duan Wendu: 234-236 DEG C, second segment melt zone temperature: 239-241 DEG C, third section melt zone temperature: 239-241 DEG C, first segment
Extruding zone temperature: 234-236 DEG C, second segment extruding zone temperature: 229-231 DEG C, third section extruding zone temperature: 229-231 DEG C；By
The melt that double screw extruder squeezes out flows out to the tabletted base of chill roll, the chill roll revolving speed 64-65r/ through T-die
Min, 20-25 DEG C of roller temperature；
Longitudinal stretching: by the piece base being pressed into it is preheated after carry out longitudinal stretching, be then formed, it is described preheating in two stages into
Row, 45-47 DEG C of first segment temperature, 53-55 DEG C of second segment temperature；The longitudinal stretching carries out in two stages, first segment temperature 58-60
DEG C, 58-60 DEG C of second segment temperature, longitudinal stretching ratio is 3.5-4.0；The sizing carries out in two stages, first segment temperature 49-51
DEG C, 40-42 DEG C of second segment temperature；
Cross directional stretch: by the preheated rear progress cross directional stretch of the piece base after longitudinal stretching, being then formed, be cooling, described pre-
For thermal process by three sections of progress, first segment temperature is 79-81 DEG C, and second segment temperature is 83-85 DEG C, and third section temperature is 90-100
℃；For the cross directional stretch process by three sections of progress, first segment temperature is 90-110 DEG C, and second segment temperature is 95-115 DEG C, third
Duan Wendu is 98-118 DEG C, cross directional stretch ratio 4.2-4.7；For the type-approval process by six sections of progress, first segment temperature is 135-
140 DEG C, second to the 5th section of temperature is 185-190 DEG C, and the 6th section of temperature is 142-147 DEG C；Cooling procedure temperature is 32-35
℃；
Obtain lithium battery flexible packaging outer layer membrane material of the thickness at 10-100 μm.
The utility model has the advantages that
Lithium battery flexible packaging of the invention with outer layer membrane material there is low water to breathe freely rate, water absorption rate and good acid resistance
Can, and it is provided simultaneously with the excellent characteristics of nylon material, and the composite film material that mutually more typical polyester film is bonded with nylon membrane, system
Make that technique is easier and cost reduces.
Detailed description of the invention:
Fig. 1 is the water absorption rate experimental result picture of embodiment and comparative example；
Specific embodiment
The present invention is further elaborated below in conjunction with the drawings and specific embodiments.
A kind of lithium battery flexible packaging outer layer membrane material, the membrane material are melted by double screw extruder by each raw material proportioning
It squeezes out, then biaxial tension sizing, specific embodiment are as follows:
[embodiment 1]
Preliminary drying: each component material is weighed by following mass parts ratio:
Wherein, the nylon 6 need to be in convection oven in 90 DEG C of preliminary drying 10h, and the polybutylene terephthalate need to be
In 110 DEG C of preliminary drying 8h in convection oven, other auxiliary agents need to be in convection oven in 80 DEG C of preliminary drying 5h；
Melting extrusion: the raw material being baked in advance are put into double screw extruder, each processing district of double screw extruder
Section parameter is as shown in the table:
The melt squeezed out by double screw extruder flows out to the tabletted base of chill roll through T-die, and the chill roll turns
Fast 65r/min, 21 DEG C of roller temperature；
Longitudinal stretching: by the preheated rear progress longitudinal stretching of the piece base being pressed into, sizing, the stretching that the longitudinal stretching is pressed
Than for 3.5-4.0, each to process section parameter as shown in the table:
Cross directional stretch: described laterally to draw by the piece base after longitudinal stretching preheated rear progress cross directional stretch, sizing, cooling
The draw ratio stretched is 4.2-4.7, and each processing section parameter is as shown in the table:
[embodiment 2]
Preliminary drying: each component material is weighed by following mass parts ratio:
Wherein, the nylon66 fiber need to be in convection oven in 90 DEG C of preliminary drying 10h, and the polyethylene terephthalate need to be
In 110 DEG C of preliminary drying 8h in convection oven, other auxiliary agents need to be in convection oven in 80 DEG C of preliminary drying 5h；Melting extrusion, longitudinal direction
It stretches, cross directional stretch technological parameter is the same as embodiment 1.
[embodiment 3]
Preliminary drying: each component material is weighed by following mass parts ratio:
Wherein, the nylon 610 need to be in convection oven in 90 DEG C of preliminary drying 10h, and the polybutylene terephthalate needs
In 110 DEG C of preliminary drying 8h in convection oven, other auxiliary agents need to be in convection oven in 80 DEG C of preliminary drying 5h；Melting extrusion is indulged
To stretching, cross directional stretch technological parameter with embodiment 1.
[embodiment 4]
Preliminary drying: each component material is weighed by following mass parts ratio:
Wherein, the nylon 6, nylon66 fiber, nylon 1010 need to be described poly- to benzene in convection oven in 90 DEG C of preliminary drying 10h
Dioctyl phthalate fourth diester need to be in convection oven in 110 DEG C of preliminary drying 8h, and other auxiliary agents need to be in convection oven in 80 DEG C of preliminary dryings
5h；Melting extrusion, longitudinal stretching, cross directional stretch technological parameter are the same as embodiment 1.
[embodiment 5]
Preliminary drying: each component material is weighed by following mass parts ratio:
Wherein, the nylon 6, Nylon 1012 need to be in convection ovens in 90 DEG C of preliminary drying 10h, the poly terephthalic acid fourth
Diester need to be in convection oven in 110 DEG C of preliminary drying 8h, and other auxiliary agents need to be in convection oven in 80 DEG C of preliminary drying 5h；Melting is squeezed
Out, longitudinal stretching, cross directional stretch technological parameter are the same as embodiment 1.
[embodiment 6]
Preliminary drying: each component material is weighed by following mass parts ratio:
Wherein, the nylon 6 need to be in convection oven in 90 DEG C of preliminary drying 10h, the polyethylene terephthalate, poly- pair
Terephtha-late need to be in convection oven in 110 DEG C of preliminary drying 8h, and other auxiliary agents need to be pre- in 80 DEG C in convection oven
Dry 5h；Melting extrusion, longitudinal stretching, cross directional stretch technological parameter are the same as embodiment 1.
[embodiment 7]
Preliminary drying: each component material is weighed by following mass parts ratio:
Wherein, the nylon 6, nylon66 fiber need to be in convection ovens in 90 DEG C of preliminary drying 10h, the poly terephthalic acid second two
Ester, polybutylene terephthalate need in convection oven in 110 DEG C of preliminary drying 8h, other auxiliary agents need in convection oven in
80 DEG C of preliminary drying 5h；Melting extrusion, longitudinal stretching, cross directional stretch technological parameter are the same as embodiment 1.
6 film of biaxial tension nylon, 66 film of biaxial tension nylon, 1010 film of biaxial tension nylon are chosen as comparing
Example 1,2,3 is compared with lithium battery flexible packaging made from above-described embodiment with outer layer membrane material, to all material physical properties
It is tested, as a result as shown in the table:
As shown above, lithium battery flexible packaging outer layer membrane material (embodiment 1-5) of the invention and nylon material (compared with
Example 1-3) mechanical property it is suitable, wherein the membrane material in embodiment 1-6 shows more excellent water vapor barrier property and heat is steady
Qualitative, moisture-vapor transmission and percent thermal shrinkage compare comparative example 1-3 and obviously want much lower.This is because adding in nylon material
Enter the extremely low polyester material of moisture-vapor transmission and carried out blending and modifying, increases substantially the water vapor barrier property of material, meanwhile,
Because the percent thermal shrinkage of polyester material is lower, the good thermal stability of material is imparted.
Examples and comparative examples of the present invention are placed at 110 DEG C preliminary drying 4h to guarantee that material as absolute dry weight, weighs it
Then quality places material 4 hours in 20 DEG C, the environment of 65%RH, every 0.5h takes out sample and weighs, and passes through calculating
The water absorption rate of material, as a result as shown in Figure 1.From figure 1 it appears that lithium battery flexible packaging of the invention outer layer membrane material
(embodiment 1-5) compares nylon membrane material (comparative example 1-3) with lower water absorption rate.This is because nylon material and polyester material
After expecting blending and modifying, the content of hydrophilic radical amide groups (- NHCO -) is greatly lowered in material, weakens material and water
Between affinity, thus the water absorbing properties of material is caused to significantly reduce.
Embodiment 1-7 and comparative example 1-3 are cut into the specimen page of 10mm × 10mm respectively, are added dropwise on two specimen pages respectively
One drop aqueous hydrochloric acid solution (pH 2), tests the acid resistance of two kinds of materials, and each sample surface changes after observing 0.5h and 1h respectively, knot
Fruit is as shown in the table:
Test result shows that the lithium battery flexible packaging made by the present invention compares nylon with outer layer membrane material (embodiment 1-5)
Membrane material (comparative example 1-3) has better acid resistance.This is because the amide groups (- NHCO -) in nylon material is in acid
It is easily hydrolyzed under the conditions of property, the physical property of material is caused to change, and the ester group (- COO -) in polyester material compares nylon material
In amide groups (- NHCO -) have better acid resistance, in nylon material be added polyester material blending and modifying after, material
The hydrolysis ability of material in acid condition is improved significantly, and physical property is more stable.Wherein, embodiment 7 is due to outer membrane
Polyester material accounting in material is insufficient, and material surface starts to whiten after 0.5 hour, and material surface is damaged after 1 hour, resistance to electrolysis
Fluidity can be between other embodiments and nylon material.
It is noted here that proportion is blended in nylon and polyester, because the toughness of polyester material is good not as good as nylon material, when
When the polyester mass fraction of addition is more than nylon mass fraction, manufactured membrane material is strong in tensile strength, tensile strength and impact
The performance of degree etc. can significantly decrease (such as embodiment 6), influence the mechanical property of material；When the polyester mass parts of addition
When number is insufficient, since nylon number accounting is excessive, the modified effect of material is unobvious (such as embodiment 7), and material is saturating in vapor
Fail performance performance advantage more outstanding in terms of crossing rate, percent thermal shrinkage and electrolyte resistance performance.Therefore recommend in the present invention
Nylon and polyester mass parts ratio are as follows: nylon: polyester=1:1~3:2.
Finally it is also important to note that more than embodiment it is of the invention by way of example only, rather than for restriction of the invention, this
All related variations that the those of ordinary skill in field directly exports or associates from present disclosure, variation,
It is considered as protection scope of the present invention.
Claims (9)
1. a kind of lithium battery flexible packaging outer layer membrane material, which is characterized in that the material is the blending and modifying material of nylon and polyester
Material, is blended with polyester, slipping agent, plasticizer, antioxidant, expanding material by nylon and is made, each component proportion are as follows: nylon: polyester
=1:1~3:2, slipping agent are the 3% of nylon and polyester gross mass number, and plasticizer is nylon and polyester gross mass number
15%, antioxidant is the 0.5% of nylon and polyester gross mass number, and expanding material is nylon and polyester gross mass number
25%.
2. a kind of lithium battery flexible packaging outer layer membrane material according to claim 1, which is characterized in that the nylon choosing
From one or more of nylon 6, nylon66 fiber, nylon 610, nylon 1010, Nylon 1012.
3. a kind of lithium battery flexible packaging outer layer membrane material according to claim 1, which is characterized in that the polyester choosing
From one or both of polyethylene terephthalate, polybutylene terephthalate.
4. a kind of lithium battery flexible packaging outer layer membrane material according to claim 1, which is characterized in that the slipping agent choosing
From stearmide, erucyl amide, oleamide, N, one of N '-ethylene bis stearamide, behenamide.
5. a kind of lithium battery flexible packaging outer layer membrane material according to claim 1, which is characterized in that the plasticizer choosing
From one of phthalate, terephthalic acid ester, fatty acid ester, epoxies, alkyl sulfonic acid vinegar class.
6. a kind of lithium battery flexible packaging outer layer membrane material according to claim 1, which is characterized in that the antioxidant
Selected from DBPC 2,6 ditertiary butyl p cresol, dibutyl hydroxy toluene, tert-butyl hydroquinone, butylated hydroxy anisole, N- phenylacetyl
One kind of base-L-Glutamine, 2,6 di tert butyl 4 methyl phenol.
7. a kind of lithium battery flexible packaging outer layer membrane material according to claim 1, which is characterized in that the expanding material choosing
From one of silane coupling agent, epoxies.
8. a kind of preparation process of lithium battery flexible packaging outer layer membrane material according to any one of claim 1 to 7,
It is characterized in that, steps are as follows:
1) preliminary drying: each component material is weighed by following mass parts ratio:
Nylon: polyester=1:1~3:2, slipping agent are the 3% of nylon and polyester gross mass number, and plasticizer is nylon and gathers
The 15% of ester gross mass number, antioxidant are the 0.5% of nylon and polyester gross mass number, and expanding material is that nylon and polyester are total
The 25% of mass fraction；
Wherein, nylon material need to be in convection oven in 90-100 DEG C of preliminary drying 10h, and polyester material need to be in convection oven in 100-
110 DEG C of preliminary drying 8h, other auxiliary agents need to be in convection ovens in 80-100 DEG C of preliminary drying 5h；
2) melting extrusion: the raw material being baked in advance are put into double screw extruder, each processing sections ginseng of double screw extruder
It counts and is respectively as follows: first segment feed zone temperature: 209-211 DEG C, second segment feed zone temperature: 229-231 DEG C, first segment melt zone temperature
Degree: 234-236 DEG C, second segment melt zone temperature: 239-241 DEG C, third section melt zone temperature: 239-241 DEG C, first segment squeezes out
Duan Wendu: 234-236 DEG C, second segment extruding zone temperature: 229-231 DEG C, third section extruding zone temperature: 229-231 DEG C；By double spiral shells
The melt that bar extruder squeezes out flows out to the tabletted base of chill roll, the chill roll revolving speed 64-65r/min, roller through T-die
Warm 20-25 DEG C；
3) longitudinal stretching: by the piece base being pressed into it is preheated after carry out longitudinal stretching, be then formed, it is described preheating in two stages into
Row, 45-47 DEG C of first segment temperature, 53-55 DEG C of second segment temperature；The longitudinal stretching carries out in two stages, first segment temperature 58-60
DEG C, 58-60 DEG C of second segment temperature, longitudinal stretching ratio is 3.5-4.0；The sizing carries out in two stages, first segment temperature 49-51
DEG C, 40-42 DEG C of second segment temperature；
4) cross directional stretch: by the preheated rear progress cross directional stretch of the piece base after longitudinal stretching, being then formed, be cooling, the preheating
For process by three sections of progress, first segment temperature is 79-81 DEG C, and second segment temperature is 83-85 DEG C, and third section temperature is 90-100 DEG C；
For the cross directional stretch process by three sections of progress, first segment temperature is 90-110 DEG C, and second segment temperature is 95-115 DEG C, third Duan Wen
Degree is 98-118 DEG C, cross directional stretch ratio 4.2-4.7；For the type-approval process by six sections of progress, first segment temperature is 135-140
DEG C, second to the 5th section of temperature is 185-190 DEG C, and the 6th section of temperature is 142-147 DEG C；Cooling procedure temperature is 32-35 DEG C；
5) lithium battery flexible packaging outer layer membrane material is obtained.
9. preparation process according to claim 1, which is characterized in that the lithium battery flexible packaging of acquisition is thick with outer layer membrane material
Degree is at 10-100 μm.
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