Measuring method for adhesive strength of flexible substrate material coating

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...

AI Technical Summary

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 completely separated from the substrate is the bonding force between the particles inside the coating, not the bonding force between the coating and the substrate

When performing a peel test, the coated flexible substrate must be bent by 180°, and there will be stress at the bent position, especially when testing the positive electrode sheet of a lithium battery, the coating is thick, and this stress causes the coating to break. fall off, making test results inaccurate

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