Method for measuring undissolved material in polymer solution
The present invention relates to a method for measuring undissolved material in a polymer solution used in the production of electrode slurry using a surface light source. The method for measuring undissolved material in a polymer solution of the present invention comprises: a solution application step of applying a polymer solution on a transparent plate; a light supplying step of supplying light with a light source to the polymer solution applied on the transparent plate; a photographing step of photographing a shape of the light transmitted through the polymer solution applied on the transparent plate; and a measuring step of confirming the number and particle size of the undissolved material in the polymer solution with a photographed image.
1. A method for measuring undissolved substances in a polymer solution, the method comprising:
applying a polymer solution on a transparent plate;
supplying light to the polymer solution applied on the transparent plate by a light source;
photographing a shape of the light having penetrated the polymer solution applied on the transparent plate and obtaining a photographed image; and
checking a number and a size of particle of undissolved substances in the polymer solution from the photographed image.
2. The method of claim 1 , wherein the polymer solution comprises a polymer solution for preparing a secondary battery electrode slurry.
3. The method of claim 1 , wherein a minimum measurable particle size of the undissolved substances is 100 μm.
4. The method of claim 1 , wherein the transparent plate comprises Over Head Projector (OHP) or glass.
5. The method of claim 1 , wherein in the applying, the polymer solution is applied with a blade.
6. The method of claim 5 , wherein a distance from the transparent plate to the blade is 80 to 200 μm.
7. The method of claim 5 , wherein a distance from the transparent plate to the blade is 100 to 150 μm.
8. The method of claim 1 , wherein the light source is positioned under the transparent plate in the light supplying step.
9. The method of claim 1 , wherein the light source is a planar surface light source.
10. The method of claim 9 , wherein the planar surface light source comprises a pattern for measuring the undissolved substances of the polymer solution on an upper part of the surface emitting light.
11. The method of claim 1 , wherein an illuminance of the light source is 750 to 1250 lux.
12. The method of claim 1 , wherein an illuminance of the light source is 900 to 1100 lux.
13. The method of claim 1 , wherein the photographing is performed on an upper portion of the transparent plate.