CN107631981A - Coat method of testing and its application of barrier film peel strength - Google Patents
Coat method of testing and its application of barrier film peel strength Download PDFInfo
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- CN107631981A CN107631981A CN201710862542.3A CN201710862542A CN107631981A CN 107631981 A CN107631981 A CN 107631981A CN 201710862542 A CN201710862542 A CN 201710862542A CN 107631981 A CN107631981 A CN 107631981A
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- barrier film
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Abstract
The present invention relates to high polymer material testing field, specifically, there is provided a kind of method of testing for coating barrier film peel strength and its application.The method of testing of the coating barrier film peel strength comprises the following steps：(a) strengthening with external bonding bar obtains test specimen on the basement membrane of coating barrier film sample；(b) test specimen is pasted on breadboard, the coating of test specimen is mutually pasted with breadboard；(c) pulling force is applied to test specimen and/or breadboard, records peel distance and peeling force between coating and basement membrane, finally obtain peel strength.Method of testing strengthening with external bonding bar first on the basement membrane of coating barrier film sample, to prevent basement membrane to be stretched deformation, when the cohesive force between coating and basement membrane is stronger, measured stripping curve is still smooth curve, the peel strength that more can truly reflect between coating and basement membrane.The method of testing is simple to operate, can provide more reliable foundation for barrier film manufacturer and battery producer.
Description
Technical field
The present invention relates to high polymer material testing field, in particular to a kind of test for coating barrier film peel strength
Method and its application.
Background technology
With the development of lithium ion battery industry, chemical property and security performance requirement of the market to lithium ion battery is got over
Come higher, and the chemical property and security of battery can be lifted on the basis of traditional basement membrane by coating barrier film, therefore coat every
The application of film is more and more extensive.
Barrier film is coated mainly using PP or PE perforated membranes as basement membrane, surface coats one layer of other materials and forms coating, passes through
Special process processing, it is bonded coating and basement membrane, the peel strength between coating and basement membrane is to coat an important finger of barrier film
Mark, as described in the patent application that publication No. is CN105606529A, in cell fabrication processes, the stripping between coating and basement membrane
Intensity is too small, can cause in the winding process of battery first, powder drops from barrier film；Secondly, if barrier film dry linting is serious,
The internal driving of battery can be caused to increase in the circulating battery later stage, reduce the cycle performance of battery.Therefore, it is necessary to coating barrier film
Coating and basement membrane between peel strength tested to ensure that there is enough peel strengths between coating and basement membrane.
Use stripping of the publication No. between the method testing coating and basement membrane in CN105606529A patent application strong
When, find when peel strength is smaller (≤200gf/cm), stripping curve is a straight curve, and coating be stripped compared with
Completely, the true peel strength of coating and barrier film is reflected.But when peel strength is more than 200gf/cm, enter in aforementioned manners
Row test, its curve descend fluctuating range larger on the whole, and observe membrane surface, still there is coating material residual, it is impossible to true
The peel strength reflected between coating and basement membrane.
In view of this, it is special to propose the present invention.
The content of the invention
The first object of the present invention is to provide a kind of method of testing for coating barrier film peel strength, this method operation letter
It is single, it can really reflect the peel strength between high bonding force coating and basement membrane.
The second object of the present invention is to provide a kind of application for the method for testing for coating barrier film peel strength, by this method
Applied to preparing coating barrier film or preparing in battery, can simply, efficiently and accurately instruct to coat the production of barrier film and battery,
It is good in economic efficiency.
In order to realize the above-mentioned purpose of the present invention, spy uses following technical scheme：
In a first aspect, the invention provides a kind of method of testing for coating barrier film peel strength, comprise the following steps：
(a) strengthening with external bonding bar obtains test specimen on the basement membrane of coating barrier film sample；
(b) test specimen is pasted on breadboard, the coating of test specimen is mutually pasted with breadboard；
(c) pulling force is applied to test specimen and/or breadboard, records the peel distance between coating and basement membrane and stripping
Power, finally obtain peel strength.
As further preferably technical scheme, the tensile strength of the reinforcing strip is more than or equal to 500MPa.
As further preferably technical scheme, the width of the reinforcing strip is 140-160mm.
As further preferably technical scheme, a length of 280-310mm, a width of 200-220mm of coating barrier film sample.
As further preferably technical scheme, the width of the test specimen is 10-20mm.
Also include as further preferably technical scheme, between step (b) and step (c) by one end of test specimen to
Breadboard pastes the step of one side turnover of test specimen.
As further preferably technical scheme, one end of the test specimen is test specimen free end；
Also include the one side that test specimen free end is pasted to test specimen to breadboard between step (b) and step (c)
Turnover, then by between coating and breadboard adhesive surface peel off 10-20mm the step of.
As further preferably technical scheme, the angle of the turnover is 90-180 °.
As further preferably technical scheme, step (c) includes：One end of breadboard is clipped in upper fixture, tested
Sample free end is clipped on lower clamp, is then started stretching-machine and is tested；
Preferably, test speed 250-350mm/min.
Second aspect, the invention provides a kind of method of testing of above-mentioned coating barrier film peel strength to prepare coating barrier film
Or prepare application in battery.
Compared with prior art, beneficial effects of the present invention are：
The method of testing of coating barrier film peel strength provided by the invention is pasted on the basement membrane of coating barrier film sample first
Reinforcing strip, to prevent basement membrane to be stretched deformation, when the cohesive force between coating and basement membrane is stronger, measured stripping curve is still
For smooth curve, the peel strength that more can truly reflect between coating and basement membrane.The method of testing is simple to operate, more can be true
The peel strength reflected between high bonding force coating and basement membrane, can provide and more may be used for barrier film manufacturer and battery producer
The foundation leaned on.
The method of testing of above-mentioned coating barrier film peel strength is applied to prepare coating barrier film or prepared in battery, Neng Goujian
Production that is single, efficiently and accurately instructing coating barrier film and battery, it is good in economic efficiency.
Brief description of the drawings
Fig. 1 is high the bonding force coating and basement membrane for using publication No. to be obtained for the method for CN105606529A patent application
Between stripping curve；
Fig. 2 is to be tested using the method for one embodiment of the present invention between obtained high bonding force coating and basement membrane
Peel off curve；
Fig. 3 is to use publication No. as the base film surface after the method test of CN105606529A patent application；
Fig. 4 is the base film surface after the method test using one embodiment of the present invention.
Embodiment
Embodiment of the present invention is described in detail below in conjunction with embodiment, but those skilled in the art will
Understand, the following example is merely to illustrate the present invention, and is not construed as limiting the scope of the present invention.It is unreceipted specific in embodiment
Condition person, the condition suggested according to normal condition or manufacturer are carried out.
In a first aspect, the invention provides a kind of method of testing for coating barrier film peel strength, comprise the following steps：
(a) strengthening with external bonding bar obtains test specimen on the basement membrane of coating barrier film sample；
(b) test specimen is pasted on breadboard, the coating of test specimen is mutually pasted with breadboard；
(c) pulling force is applied to test specimen and/or breadboard, records the peel distance between coating and basement membrane and stripping
Power, finally obtain peel strength.
Because barrier film is a kind of flexible material, tested using the method for the patent application that publication No. is CN105606529A,
When coated adhesive power is stronger, peel strength between coating and basement membrane is more than basement membrane and is stretched in itself the power of deformation, so
Stripping process basement membrane is stretched deformation, and force value curve rises, until when measuring distance continues increase, basement membrane intensity level increases to greatly
Peel strength between coating and basement membrane, coating are lifted off of, and force value curve declines, ripple above and below the test curve finally obtained
Dynamic amplitude is larger, it is impossible to the real stripping curve reflected between coating and basement membrane, and test surfaces are observed, still have on basement membrane
White coating material remains, specifically as shown in figures 1 and 3.
The method of testing of the coating barrier film peel strength of present invention strengthening with external bonding first on the basement membrane of coating barrier film sample
Bar, to prevent basement membrane to be stretched deformation, when the cohesive force between coating and basement membrane is stronger, measured stripping curve is still light
Sliding curve, the peel strength that more can truly reflect between coating and basement membrane.The method of testing is simple to operate, more can be really anti-
The peel strength between high bonding force coating and basement membrane is mirrored, can be provided for barrier film manufacturer and battery producer more reliable
Foundation.
" the high bonding force coating " being previously mentioned in the present invention refers to the coating for being higher than 200gf/cm with the peel strength of basement membrane.
In the present invention, " reinforcing strip " is the material for referring to increase basement membrane intensity." breadboard " refers to be easy to test specimen
The material of stickup, the material of breadboard can be glass, plastics, ceramics or metal etc., for example, can be slide, plastic sheet,
Potsherd or sheet metal etc..
In the present invention, the face on the basis of the plane where breadboard, to the side of test specimen and/or breadboard application pulling force
To that can be parallel to reference plane or perpendicular to reference plane, peel strength when peel angle is 180 ° or 90 ° be thus obtained.
Preferably, the coating barrier film is that battery coats barrier film, more preferably lithium ion battery coating barrier film.
According to material point, the coating barrier film is preferably ceramic coating membrane or boehmite coating barrier film.
It is preferably carried out in one kind in mode, the tensile strength of the reinforcing strip is more than or equal to 500MPa.Work as tensile strength
During more than or equal to 500MPa, the intensity of reinforcing strip can effectively protect basement membrane not to be stretched deformation.
It is preferably carried out in one kind in mode, the width of the reinforcing strip is 140-160mm.Reinforcing strip width typical case but
It is nonrestrictive for 140mm, 142mm, 144mm, 146mm, 148mm, 150mm, 152mm, 154mm, 156mm, 158mm or
160mm.It is further preferred that the width of reinforcing strip is 144-154mm.It is particularly preferred that the width of reinforcing strip is 150mm.
It is preferably carried out in one kind in mode, coats a length of 280-310mm, a width of 200-220mm of barrier film sample.Coating
The length of barrier film sample it is typical but non-limiting for 280mm, 282mm, 284mm, 286mm, 288mm, 290mm, 292mm,
294mm, 296mm, 298mm, 300mm, 302mm, 304mm, 306mm, 308mm or 310mm；Coat barrier film sample width typical case but
It is nonrestrictive for 200mm, 202mm, 204mm, 206mm, 208mm, 210mm, 212mm, 214mm, 216mm, 218mm or
220mm。
It is preferably carried out in one kind in mode, the width of the test specimen is 10-20mm.The test specimen of above-mentioned width
It is easy to paste on breadboard, while is also more convenient test.The width of test specimen it is typical but non-limiting for 10mm,
11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm or 20mm.It is further preferred that the width of test specimen
Spend for 12-18mm.It is particularly preferred that the width of test specimen is 15mm.
The width of above-mentioned test specimen significantly lower than coating barrier film sample width, therefore, the test specimen be coating every
What membrane sample obtained after processing.Processing mode is preferably to cut or shear.Machine direction is preferably to coat barrier film sample
MD directions.MD (Mechine Direction) refers to the operating direction or length direction of barrier film.
It is preferably carried out in mode in one kind, also includes between step (b) and step (c) by one end of test specimen to examination
Test the step of plate pastes the one side turnover of test specimen." one end of test specimen " refers to test specimen being pasted on breadboard
After upper, test specimen one end mutually not be bonded with breadboard, it should be appreciated that one end of the test specimen can tried
Sample is tested to be pasted on one end i.e. mutually not be bonded with breadboard when on breadboard or be pasted on breadboard in test specimen
The one end peeled off again after upper." one side that test specimen is pasted to breadboard turns down " abbreviation " reversely turnover ", by test specimen
One end reversely turns down, and then applies pulling force to test specimen and/or breadboard again, so as to realize point between coating and basement membrane
From.
It is preferably carried out in one kind in mode, one end of the test specimen is test specimen free end；
Also include the one side that test specimen free end is pasted to test specimen to breadboard between step (b) and step (c)
Turnover, then by between coating and breadboard adhesive surface peel off 10-20mm the step of.Present embodiment is by the one of test specimen
End be defined to test specimen free end, the test specimen free end be when test specimen is pasted on breadboard i.e. not with examination
One end that plate is mutually bonded is tested, for the ease of being smoothed out for test, will be applied before pulling force is applied to test specimen and/or breadboard
Adhesive surface between layer and breadboard peels off 10-20mm.
It is preferably carried out in one kind in mode, the angle of the turnover is 90-180 °.The angle of above-mentioned turnover is typical but non-
It is restricted for 90 °, 100 °, 110 °, 120 °, 130 °, 140 °, 150 °, 160 °, 170 ° or 180 °.
It is further preferred that the angle of the turnover is 180 °.
It is preferably carried out in one kind in mode, step (c) includes：One end of breadboard is clipped in upper fixture, test sample
Product free end is clipped on lower clamp, is then started stretching-machine and is tested.A kind of peel angle is provided in present embodiment is
Specific filling structure at 180 °, it should be appreciated that breadboard and test specimen free end fold up position and stretching-machine
The position of middle clamping device is relevant, if can guarantee test plate and test specimen be located in parallel plane, for example, above-mentioned
" upper fixture " can be replaced " left fixture ", and " lower clamp " can be replaced " right fixture ", and the position of " upper fixture " and " lower clamp "
Putting to exchange, and each filling structure of the above is within the scope of the present invention.Above-mentioned filling structure refers to publication No.
The accompanying drawing 1 of CN105606529A patent application specification.
In order to ensure that peel angle is tested for 180 ° and for convenience, test specimen is preferably in vertical state.It should be understood that
, replaced with when " upper fixture " " left fixture ", when " lower clamp " replaces with " right fixture ", in order to ensure that peel angle is 180 °
And test for convenience, test specimen is preferably horizontal.
Preferably, test speed 250-350mm/min.
In order to reduce test error, to each coating barrier film sample 3-8 peel strength of duplicate measurements, then take stripping strong
The average value of degree.
Second aspect, the invention provides a kind of method of testing of above-mentioned coating barrier film peel strength to prepare coating barrier film
Or prepare application in battery.The method of testing of above-mentioned coating barrier film peel strength is applied to prepare coating barrier film or prepares electricity
Chi Zhong, it can simply, efficiently and accurately instruct to coat the production of barrier film and battery, it is good in economic efficiency.
With reference to embodiment and comparative example, the present invention will be further described in detail.
Embodiment
Coat barrier film to ceramic coating membrane and boehmite that thickness is 16 μm respectively to test, PE basement membrane thicknesses are 12
μm, one side coating layer thickness is 4 μm, test speed 300mm/min.Concrete operation step is as follows：
Take A4 sizes (210mm × 297mm) sample one to open, the reinforcing strip that width is 150mm is pasted onto sample base film surface；
The sample reinforced is cut into the batten that width is 15mm with sanction model machine；
Sample preparation：Cut the two-sided of appropriate length and be glued to slide center, then will be cut out along slide length direction
Good batten adheres to double faced adhesive tape center, and being pressed lightly on hand makes the coating of coating barrier film be bonded completely with double faced adhesive tape, after the completion of general
Reversely 180 ° of the turnover of sample free end, peels off adhesive surface about 10-20mm；
Press from both sides sample：By slide one end in upper fixture, barrier film free end is clipped on lower clamp, and the batten clipped need to ensure
On one vertical line；
Test：Start stretching-machine and proceed by test, draw the peeling force between coating and barrier film.
Peel strength test value such as following table：
Table 1
Comparative example
Barrier film sample is coated to the ceramic coating membrane sample in embodiment and boehmite respectively, utilizes Application No.
201510999464.2 patent application in method tested：
Peel strength test value such as following table：
Table 2
From table 1 and 2, embodiment tests obtained ceramic coating membrane and the peel strength of boehmite coating barrier film is equal
Value is above comparative example, and its peel strength numerical value is more accurate, can more reflect the peel strength between real coating and basement membrane；
Also, the standard deviation of embodiment test is less than comparative example, illustrates the number for the peel strength that the method for testing in embodiment obtains
The dispersion degree of value is lower, and the method for testing is more reliable and more stable relative to comparative example.
In addition, from Fig. 1 and 2 contrast as can be seen that test to obtain using the method for the present invention is that smooth stripping is bent
Line, and use publication No. for the method in CN105606529A patent application obtain stripping curve fluctuating range up and down compared with
Greatly, it is impossible to the real peel strength reflected between coating and basement membrane.From figure 3, it can be seen that use publication No. for
After method in CN105606529A patent application is peeled off, peeling off the membrane surface of section still has coating material to remain (bar
Line shape), illustrate to peel off incomplete, the peel strength that can not truly reflect between high cohesive force coating and basement membrane；Can be with from Fig. 4
Find out, after being peeled off using the method for the present invention, peeling off the membrane surface of section does not have coating material residual, illustrates to have peeled off
Entirely, the peel strength that can truly reflect between high cohesive force coating and basement membrane.
Although illustrate and describing the present invention with specific embodiment, but will be appreciated that without departing substantially from the present invention's
Many other change and modification can be made in the case of spirit and scope.It is, therefore, intended that in the following claims
Including belonging to all such changes and modifications in the scope of the invention.
Claims (10)
1. a kind of method of testing for coating barrier film peel strength, it is characterised in that comprise the following steps：
(a) strengthening with external bonding bar obtains test specimen on the basement membrane of coating barrier film sample；
(b) test specimen is pasted on breadboard, the coating of test specimen is mutually pasted with breadboard；
(c) pulling force is applied to test specimen and/or breadboard, records peel distance and peeling force between coating and basement membrane, most
After obtain peel strength.
2. the method for testing of coating barrier film peel strength according to claim 1, it is characterised in that the reinforcing strip resists
Tensile strength is more than or equal to 500MPa.
3. the method for testing of coating barrier film peel strength according to claim 1, it is characterised in that the width of the reinforcing strip
Spend for 140-160mm.
4. the method for testing of coating barrier film peel strength according to claim 1, it is characterised in that coating barrier film sample
A length of 280-310mm, a width of 200-220mm.
5. the method for testing of coating barrier film peel strength according to claim 1, it is characterised in that the test specimen
Width is 10-20mm.
6. the method for testing of the coating barrier film peel strength according to claim any one of 1-5, it is characterised in that step
(b) the step of also including pasting one end of test specimen into the one side turnover of test specimen to breadboard between step (c).
7. the method for testing of coating barrier film peel strength according to claim 6, it is characterised in that the test specimen
One end is test specimen free end；
The one side for also including pasting test specimen free end to breadboard test specimen between step (b) and step (c) turns down,
Then the step of adhesive surface between coating and breadboard being peeled off into 10-20mm.
8. the method for testing of coating barrier film peel strength according to claim 7, it is characterised in that the angle of the turnover
For 90-180 °.
9. the method for testing of coating barrier film peel strength according to claim 8, it is characterised in that step (c) includes：Will
One end of breadboard is clipped in upper fixture, and test specimen free end is clipped on lower clamp, is then started stretching-machine and is tested；
Preferably, test speed 250-350mm/min.
10. the method for testing of the coating barrier film peel strength described in claim any one of 1-9 is preparing coating barrier film or preparation
Application in battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710862542.3A CN107631981A (en) | 2017-09-21 | 2017-09-21 | Coat method of testing and its application of barrier film peel strength |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710862542.3A CN107631981A (en) | 2017-09-21 | 2017-09-21 | Coat method of testing and its application of barrier film peel strength |
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| CN110208083A (en) * | 2019-06-28 | 2019-09-06 | 贵州民族大学 | It is a kind of for sputtering the clamping device of glass slide coating tensile test |
| CN110398413A (en) * | 2018-04-25 | 2019-11-01 | 银隆新能源股份有限公司 | The characterizing method of cohesive force between the basement membrane and ceramic coating of ceramic diaphragm |
| CN111693458A (en) * | 2020-07-21 | 2020-09-22 | 万力轮胎股份有限公司 | Method for measuring viscosity of rubber material |
| CN112082940A (en) * | 2020-09-02 | 2020-12-15 | 山东司莱美克新材料科技有限公司 | Method for testing bonding force pull-off of ceramic plate |
| CN112204793A (en) * | 2018-03-02 | 2021-01-08 | 阿姆泰克研究国际公司 | Dimensionally stable microporous web |
| CN114295434A (en) * | 2021-11-24 | 2022-04-08 | 无锡极电光能科技有限公司 | Preparation method of peel strength test sample piece and peel strength test sample piece |
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| CN114295434A (en) * | 2021-11-24 | 2022-04-08 | 无锡极电光能科技有限公司 | Preparation method of peel strength test sample piece and peel strength test sample piece |
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Application publication date: 20180126 |