Principles and test methods of fluorine-free anti-siphoning

1. What is anti-siphoning?
Anti-siphonage can be divided into two types: static and dynamic. This article mainly introduces static anti-siphonage. In shoe material processing or leather anti-siphon finishing, static anti-siphonage refers to a performance that prevents water or liquid from being sucked from a low place to a high place when it is stationary and wet with water or liquid. To have an anti-siphon function, you first need to have a water-repellent function. In the textile industry, waterproof and anti-siphonage are mostly used in leather and shoe materials. Such as: fly woven shoe uppers, shoelaces, ribbons or hemp ropes, etc. Here we recommend an anti-siphon-free fluorine-free waterproofing agent WSA-07 from Suzhou Leman, China.

2. Anti-siphon principle
The reason why fluorine-free waterproofing agents can improve the anti-siphonage performance of fabrics is not to block the pores between fibers, improve the internal density of the material matrix, nor to form a closed waterproof film layer, but to infiltrate the fiber pore ports and change their surface energy, thus Increase the water contact angle, causing water to shrink along the fiber pores, preventing water from climbing upward through the pores, thereby achieving waterproof and anti-siphoning effects.

3. Anti-siphon test method
1. Cut the three samples that have been treated with anti-siphonage into 2x25cm (fabrics) or directly cut to the height of the tester (shoelaces).
2. Pour in blue dye water until the water level is flush with the scale line (in the water tank of the anti-siphon tester).
3. First adjust the lower end of the test sample to be flush with the lower edge of the anti-siphon tester and fix it, then fix the upper end of the test sample on the shelf.
4. Slowly insert the sample holder into the water tank filled with blue dye water, and ensure that it is submerged to the “0″ mark on the scale.
5. In this state (as shown below), let the test sample be immersed in water for 2 hours or more, and ensure that it is observed and recorded at least every 30 minutes.