What is the raincoat material?
[materials] raincoat made of waterproof raincoat is sewn into the cloth, such as cloth, tarpaulin, plastic film, including the latest polytetrafluoroethylene (PTFE) waterproof breathable fabric etc..
The rain falls on the surface of the raincoat is a kind of non infiltration phenomenon, because the attraction of rubber molecules to water molecules is much smaller than the attraction between water molecules, water molecules prefer to get together, down the raincoat surface. At the same time, there are many small holes made of cloth raincoat, but not because of the rain infiltration rubber, water molecules from these holes through the raincoat to cloth, and these holes of air molecules not to play the role of the organization, it is ensured that the permeability of the raincoat. Since the key is in the layer of waterproof raincoat rubber cloth cover, then the raincoat in the storage time also should pay special attention not to damage the waterproof layer of cloth, avoid sharp objects scratching raincoat would not have said, there are two things that need special attention, a raincoat is after cleaning to avoid them dried in the sun, so as to avoid the aging of rubber, rubber is a polymer material, there are a lot of atoms and unsaturated chemical bonds, easily with various elements in the air, such as oxygen reaction, and the reaction is irreversible; two is the raincoat in the storage time and try not to have oil a class of objects together, lest they pollute the raincoat, you know the words of the dirty cloth raincoat is hard to wash.
When a drop of liquid falls on a solid surface, there are two different states depending on the attractive force between the molecules and the intermolecular attraction inside the liquid. When the molecular attraction between the liquid and solid liquid less than internal molecular attraction, the droplet will tend to shrink into a small droplet on the solid surface; when the molecular attraction between the liquid and solid liquid is greater than the internal molecular attraction, droplets tend to spread on the solid surface. For the former phenomenon, the physicist called "no infiltration", such as mercury on the glass plate, the latter phenomenon is known as "infiltration", such as water droplets on the glass plate.
[principle] modern raincoat waterproof raincoat material and style more and more, but no matter how to change, there is a raincoat is never change, that is the rain drops on it will soon form a small water flow away, this is the reason for the waterproof raincoat.
