This part of GB/T 22638 specifies the determination method for hydrophilic property of coated aluminum and aluminium alloy foils.
This part is applicable to the determination of hydrophilic property of coated aluminum and aluminum alloy foils.
The contact angle tester method specified in this part is the arbitration test method for hydrophilic property of aluminium and aluminium alloy foils.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 8170 Rules of rounding off for numerical values & expression and judgment of limiting values
3 Principle
Drop distilled water droplets on the surface of the coating, and the water droplets will spread under the action of surface tension. In this method, the hydrophilic property of the coating is determined by measuring the contact angle (i.e. hydrophilic angle) formed by the water droplet and coating surface.
4 Reagents
4.1 Distilled water, which shall meet the requirements of Grade 3 water for laboratory use specified in GB/T 6682.
4.2 Cleaning-free volatile oil.
5 Apparatus
5.1 Contact angle tester, with a measurement precision of 0.1°.
5.2 Air blast constant temperature oven, with the temperature controllable at 150℃±1℃.
5.3 Beaker, with a capacity of 500 mL.
5.4 Water tank, with a cross-sectional area of 280 mm×200 mm.
5.5 Microsyringe, 10 μL.
5.6 Vernier caliper, 0 mm to 100 mm, with a resolution of 0.02 mm.
6 Specimen preparation
6.1 Specimens of initial hydrophilic angle
Take 3 clean and flat specimens with the dimension of 100 mm×50 mm
6.2 Specimens of process hydrophilic angle )
Cut the specimens according to 6.1, immerse the specimens in the cleaning-free volatile oil (4.2) for 5 min, and remove the clean-free volatile oil from the surface after taking them out. Bake the specimens in an air blast constant temperature oven (5.2) at a temperature of 150 ℃ for 5 min, then take them out and cool them to room temperature. Immerse them in distilled water (4.1) for 5 min, then place them in an air blast constant temperature oven (5.2) at a temperature of 150 ℃ for 10 min, and cool the specimen for later use. During the whole test, the specimens shall not adhere to each other.
GB/T 22638.9-2016 The following standards are cited：
GB/T 22638.9-2016 Cited by the following standards：
