what is hydrophobic fabric

When it comes to mattresses, everyone is familiar with them. Mattresses on the market are easy to find, but I believe many people do not pay much attention to the fabric of mattresses. In fact, the fabric of mattresses is also a big question. Today, the editor will talk about one of them, after all, a fabric cannot be summarized in just a few words.

Today, the editor is going to introduce a fabric that has a waterproof effect in mattress fabrics.

What is hydrophobic fabric?

Waterproof fabric – literally, it means preventing water from penetrating from one side of the fabric to the other. It is a new type of textile fabric, composed of a polymer waterproof and breathable material (PTFE film) combined with a fabric composite fabric.

Why can it be waterproof?

Nowadays, many mattress fabrics are not waterproof, only a small amount of water stains stick to the mattress, which will seep into it after a while, providing a good living environment for bacteria and mites. And for waterproof fabrics, such a situation would not have been discovered. Its principle is that in the state of water vapor, water particles are very small, and according to the principle of capillary movement, they can smoothly penetrate the capillary to the other side, resulting in the phenomenon of permeability. When water vapor condenses into water droplets, the particles become larger. Due to the surface tension of the water droplets (water molecules pull and resist each other), water molecules cannot smoothly detach from the water droplets and penetrate to the other side, which prevents water infiltration and makes the breathable membrane waterproof. The spunbond non-woven fabric produced by Liansheng also has a waterproof effect and is widely used in the production of spring bags in mattresses. It is cheap and durable.

What are the main characteristics of waterproof fabrics?

The main functions of waterproof fabrics include waterproofing, moisture permeability, breathability, insulation, and wind resistance. In terms of production technology, the technical requirements for waterproof and breathable fabrics are much higher than those for general waterproof fabrics; At the same time, in terms of quality, waterproof and breathable fabrics also have functional characteristics that other waterproof fabrics do not have. Waterproof and breathable fabrics not only enhance the airtightness and water tightness of the fabric, but also have unique breathability. They can quickly expel water vapor inside the structure, avoid the growth of mold, and keep the human body always dry. They perfectly solve the problems of breathability, wind resistance, waterproofing, and warmth, making them a new type of healthy and environmentally friendly fabric.

A mattress is an essential bedding item in our daily life. If there are children who are more active at home, you can consider buying a mattress made of waterproof fabric to use back, which may reduce a lot of trouble in your life.

How to repel water

1. Yang’s formula

A droplet of liquid falls on a solid surface, assuming that the surface is ideally flat, the gravity of the droplet is concentrated at a point, and the amount in the field is ignored. Due to the interaction between the surface tension (Ys) of fibers in the fabric, the surface tension (YL) of liquids, and the interfacial tension (YLS) of fasteners, droplets will form various shapes (from cylindrical to completely flat). When a liquid droplet is in equilibrium on a solid surface, point A is subjected to the effect of scattered gravity, except for complete leveling.

Angle 0 is called the contact angle, When 0= At 00 o’clock, the liquid droplet wets the solid surface on a cotton screen, which is the limit state of the solid surface being wetted by the field. When 0=1800, the liquid droplet is cylindrical, which is an ideal non wetting state. In water repellent finishing, the surface tension of the liquid droplet can be regarded as a constant. Therefore, whether the field can wet the solid surface is equal to the relay tension of the dead lotus leaf on the solid surface in the bank. It is said that a larger contact angle of 0 is more favorable for the water droplet Rolling loss, which means the smaller the better.

2. Fabric adhesion work

Due to the fact that Ys and YLS cannot be directly measured, contact angle 0 or cos0 is usually used to directly evaluate the degree of wetting. However, the contact angle is not the cause of wetting, and the actual result is therefore a parameter that represents the adhesion work and an interaction between them, as well as the degree of wetting.

Both YL and cos0, which represent adhesive work, can be measured, so the equation has practical significance. Similarly, the work required to divide a liquid droplet per unit area on the interface into two droplets is 2YL, which can be referred to as the cohesive work of the liquid. From the formula, it can be seen that as the adhesion work increases, the contact angle decreases. When the adhesion work is equal to the cohesive work, that is, the contact angle is zero. This means that the liquid is completely flattened on the solid surface. Since cos0 cannot exceed 1, even if the adhesion work is greater than 2YL, the contact angle remains unchanged. If WSL=”YL, then 0 is 900. When the contact angle is 180 °, WSL=O, indicating that there is no viscous effect between the liquid and solid. However, due to some adhesive effect between the two compartments, the situation where the contact angle is equal to 180 ° has never been found, and at most, only some approximate situations can be obtained, such as angles of 160 ° or larger.

3. Critical surface tension of fabric

Due to the almost impossible measurement of solid surface tension, in order to understand the wettability of the solid surface, someone has measured its critical surface tension. Although the critical surface tension cannot directly represent the surface tension of the solid, but rather the size of Ys YLS, it can indicate the difficulty of wetting the surface of the solid. But it should be

It should be noted that measuring the critical surface tension is an empirical method and the range of measurement is also very narrow.

It can be seen that except for cellulose, the critical surface tension of all substances is taxed to be low, so they all have a certain degree of water repellency, with CF3 being the largest and CH being the smallest. Obviously, any material seat with larger contact delivery and smaller critical surface tension, as well as any finishing agent, can achieve better water repellent effects.