What are the evaluation methods for the anti-sticking and easy-cleaning properties of PTFE-coated fiberglass fabric with respect to oil stains and dust?

1. Contact Angle and Surface Energy Testing (Wettability Basics)

- Static Contact Angle: Measured using water and diiodomethane (or hexadecane) separately. The water contact angle is typically above 110°. A higher oil contact angle indicates stronger resistance to oil fouling and adhesion.

- Rolling/Sliding Angle: The angle at which a droplet of a specific volume begins to slide off a slowly tilted surface. A smaller rolling angle indicates better anti-sticking and easy-cleaning properties, which is especially critical for oil stain testing.

- Surface Free Energy Calculation:The polar and dispersive components are calculated using methods such as Owens-Wendt. The lower the surface energy (PTFE's ideal value is approximately 18–20 mN/m), the more difficult it is for solid contaminants and liquids to wet and spread.

2. Mechanical Evaluation of Anti-Sticking Properties (Peel Force/Adhesion Force)

- Standard Pressure-Sensitive Tape Peel Test: A specified standard tape (e.g., 3M 810 or a designated pressure-sensitive tape) is pressed onto the PTFE tape surface using a standard roller. After being left to stand for a set time, a 180° peel test is performed with a tensile testing machine (refer to GB/T 2792). The lower the peel force, the stronger the anti-sticking property, with an ideal value below 0.1 N/25 mm.

- Specific Medium Adhesion Test: Adhesive substances that are actually encountered in use, such as asphalt, self-adhesive labels, or hot-melt adhesives, are used to measure the force required to peel them off the surface.

3. Simulated Tests for Oil Resistance and Easy Cleanability

- Oil Stains Sliding/Residue Method: A set amount of engine oil, cooking oil, or artificial grease is applied onto a sample tilted at a certain angle. The sliding length of the oil stain or the percentage of residual area on the surface is measured.

- Quantitative Wiping Cleaning Efficiency:

    - A standard artificial soil (a mixture of carbon black, grease, and oleic acid) is evenly applied and dried. A lint-free cloth moistened with water and a neutral detergent is used to wipe back and forth for a fixed number of cycles under a set load.

    - Manufacturers of PTFE-coated fiberglass fabric in Jiangsu typically use a color difference meter to measure the color difference ΔE before and after wiping, or quantify cleaning efficiency by the residual soil mass (gravimetric method). A smaller ΔE and lower residual weight indicate better easy-cleaning performance. The recovery rate of the contact angle on the cleaned surface can also be measured.

- Quick Qualitative Test with Oily Marker: An oily marker is used to draw lines on the surface. Observe whether the ink shrinks into discontinuous droplets or spreads continuously, and then wipe with a dry cloth to see if it is easily removed. Pronounced shrinkage and easy removal indicate good anti-fouling and easy-cleaning properties.

4. Anti-Dust and Anti-Particle Adhesion Testing

- Dust Settling Method: Standard test dust (e.g., ISO 12103-1 A2 fine dust) is allowed to settle naturally onto vertically or 45°-inclined sample surfaces inside a closed chamber. After gentle tapping or blowing with low-pressure gas, the residual dust area/mass is measured using image analysis or gravimetric methods.

- Dust Removal by Airflow Method: A known amount of dust is evenly sprinkled onto a horizontal sample. The flow rate of a nitrogen stream is gradually increased, and the minimum airflow velocity required to completely blow off the dust is recorded. The lower the velocity, the better the anti-dust adhesion property.

- Evaluation of Electrostatic Adsorption Effects: Since dust adsorption is often exacerbated by static electricity, the surface resistivity and electrostatic decay time should also be tested to distinguish whether the effect is due to chemical anti-sticking or electrostatic adsorption.

5. Supporting Durability Evaluation

- After high-temperature aging (e.g., at 260°C or 300°C) or friction/wear (Taber abrasion), the above-mentioned contact angle, peel force, and cleaning efficiency tests are repeated to ensure that performance does not degrade sharply during long-term use.

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The above information is provided by Jiangsu Aoke New Material Technology Co., Ltd.

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