Measuring method for adhesive strength of flexible substrate material coating
A flexible substrate, adhesion strength technology, applied in the direction of measuring devices, analysis materials, instruments, etc., can solve the problems of inaccurate test results, inability to guarantee complete separation of coating and substrate, coating peeling off, etc., to overcome the strong subjectivity , simple operation, good repeatability
Active Publication Date: 2015-05-06
SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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Problems solved by technology
The disadvantage of this method is that the coating cannot be guaranteed to be completely separated from the substrate when measuring. In some places, the coating will be completely separated from the substrate, and in some places the coating will still remain on the substrate, so the minimum pulling force of the test cannot represent the The pulling force of the separation of the coating, the value of the pulling force obtained at the position where the coating is not
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[0041] Example
[0042] Prepare the positive pole piece to be tested: add 100 parts by weight of LiCoO 2 , 2.5 parts by weight of binder PVDF, 3 parts by weight of conductive agent acetylene black are added to 65 parts by weight of NMP solvent, and then stirred in a vacuum mixer to form a uniform positive electrode slurry. The slurry was uniformly coated on one side of an aluminum foil with a width of 400 mm and a rear 20 μm, then dried at 120° C., rolled, and slit to obtain a positive pole piece with a size of 140 mm×50 mm.
[0043] Prepare the negative electrode piece to be tested: add 100 parts by weight of negative active material natural graphite, 1.0 part by weight of binder PVDF and 1.0 part by weight of conductive agent carbon black into 120 parts by weight of NMP solvent, and then stir in a vacuum mixer to form Stable and uniform negative electrode slurry. The slurry was uniformly coated on a single side of a copper foil with a width of 400 mm and a thickness of 10 μm, dr...
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Abstract
The invention relates to a measuring method of adhesive strength, and in particular relates to a measuring method for adhesive strength of flexible substrate material coating. The measuring method for adhesive strength of flexible substrate material coating comprises the following steps: measuring the interior binding power of the coating and measuring the bonding strength between the coating and a substrate; the measurement of the interior binding power of the coating comprises the following steps: calculating the interior binding power of the coating according to the formula: theta=F/S, wherein F is stripping force, S is the width of the binding strip; the measurement of the bonding strength between the coating and the substrate comprises the following steps: winding a coating body on stainless steel bars with different diameters, and calculating the strength value of the binding power between the coating layer and the flexible substrate according to the separation state between the coating layer and the flexible substrate during winding. According to the measuring method, the repeatability is good, the operation is simple, the defects that the measurement result subjectivity is strong and the repeatability and the veracity are poor in the grid method in the prior art can be overcome. The defect that the coating is impacted by 180-degree bending during the testing process of the stripping method is also overcome, and the interior adhesive force of the coating and the adhesive force between the coating and the flexible substrate are separately measured.
Description
technical field [0001] The invention relates to a method for measuring the adhesion strength, in particular to a method for measuring the adhesion strength of a flexible base material coating. Background technique [0002] The lithium-ion battery mainly includes a pole core and a non-aqueous electrolyte, and the pole core and the non-aqueous electrolyte are sealed in the battery casing, the pole core includes a battery electrode and a diaphragm, and the battery electrode includes a positive pole piece and a negative pole The positive electrode sheet includes a positive electrode collector and a positive electrode material coated / or filled on the positive electrode collector, and the negative electrode sheet includes a negative electrode collector and a negative electrode material coated and / or filled on the negative electrode collector . [0003] The pole pieces in lithium batteries have a great impact on battery performance. During the charging and discharging process of l...
Claims
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Inventor 王军刘炜洪王汉利唐妮李秀芬
Owner SHANDONG HUAXIA SHENZHOU NEW MATERIAL
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