PTFE, PFA, FEP, PVDF Fluoroplastic products industry experts
What is ePTFE membrane? The role and use of ePTFE membrane
Classification:
Industry dynamics
Author:
PFA tube little sister
Source:
Dankai
Release time:
2023-01-04
Visits:
ePTFE is a microporous membrane formed by expanding and stretching polytetrafluoroethylene as a raw material. Experiments have found that the surface of PTFE membrane is covered with fibril-like micropores, with as many as 9 billion per square inch.
Micropores, cross-section is a network structure, in the three-dimensional structure of the hole has a mesh connection, hole set, hole bending and other very complex structures. The diameter of the water vapor molecule is
0.0004 microns, while the diameter of the light mist with the smallest diameter in rainwater is 20 microns, the diameter of drizzle has reached 400 microns, and the diameter of PTFE micropores varies from
0.1-0.5 microns, pore diameter between water vapor and rain, it is the top waterproof breathable material. Composite fabric is made of expanded polytetrafluoroethylene film (ePTFE) with polyester fiber
Fit by special process.
ePTFE membrane windproof:
Before the advent of PTFE, there was no ideal solution for the textile industry to take into account the requirements of waterproof and breathable, and the existing materials could only be low waterproof and breathable, or could not take into account. Due
The mesh microporous structure of ePTFE membrane, the air flow rate through the e-PTFE membrane per second is 3.6mm, I .e. 3.6 mm/s, air molecules are difficult to penetrate, and the external air flow cannot be directly penetrated.
The fabric is in contact with the human body. The wind passes through the fabric, but does not directly pass through the e-PTFE microporous membrane, so it has good wind resistance. Windproof: Special aspect of TEX microporous film
To the three-dimensional cross arrangement structure, its air penetration is only the 1/2 of general man-made fiber or down clothing.
Figure 1: ePTFE membrane Source: Network
ePTFE membrane water resistance:
The ePTFE membrane also has a water-free feature. Its water pressure resistance can reach 1800mbar, that is, when the pressure is greater than 18 meters of water column, it can penetrate. General waterproof nylon waterproof degree only
1000-2000mm, can only withstand general showers; The better one is 5000mm, which can withstand heavy rain. The U.S. military standard is only 7000mm, and the waterproof degree of PTFE can be as high
20000mm. Waterproof: The water pressure of general waterproof nylon is only 1000-2000mm, which can only withstand general showers, and the better one is 5000 mmH2O, which can withstand heavy rain;
The water resistance of TEX is up to 10000mm.
EPTFE membrane moisture permeability:
The microporous structure of the e-PTFE membrane can discharge the brain vapor more and faster, so that the sweat vapor does not accumulate and condense between the body surface and the fabric, so that the human body remains dry and comfortable. General Inspection
The measured value was 10000g/m2 for 224h, I .e. 10000 grams of water vapor per square meter of PTFE membrane passed over 24 hours. General waterproof breathable fabric only 2000-
3000g/m224hr. Moisture permeability: the specification of moisture permeability is g/m2/24h (g per square meter per 24 hours), and the general waterproof and moisture permeable cloth is only 2000-3000
G/m2/24h, while TEX's moisture permeability is as high as 8000-10000g/m2/24h!
Figure 2: ePTFE Membrane Source: Network
Other protection:
In addition to the molten alkali metal, Dankai PTFE is almost not corroded by any chemical agent. For example, in concentrated sulfuric acid, nitric acid, hydrochloric acid, or even boiled in aqua regia, its weight and
There is no change in performance, PTFE does not absorb moisture, non-flammable, oxygen, ultraviolet are extremely stable. At the same time has a very strong biological adaptability, will not cause the body's rejection,
The human body has no physiological side effects.
The e-PTFE fabric produced now is made by pressing the e-PTFE film and the fabric through a special process layer. Generally divided into single stick fabric, double stick fabric.
Single paste (two in one):e-PTFE microporous membrane is pressed with nylon or polyester fabric as the surface layer.
Double paste (three-in-one): nylon or polyester fabric as the surface layer, nylon warp knitted fabric as the inside layer, the middle is e-PTFE microporous membrane layer pressed.
Figure 3: ePTFE Membrane Source: Network
The experiment shows that when the temperature of the microclimate zone in the clothes near the human skin is about 32 ℃, and the humidity is about 50, the human body is in the best physiological state.
state. Sweating in the human body is an effective means of heat dissipation in the regulation of thermal balance. 80% of the heat dissipated by the human body is evaporated and dissipated by the skin on the body surface. For a long time, PVC, PU, TPU, etc.
Although the coating and laminated fabric have a certain effect on the waterproof and warm-keeping of the clothing, it can not discharge the sweat to the outside of the clothing, so that the sweat accumulates in the clothing and makes the human body feel
There are damp, cold, stuffy phenomenon. The special microporous structure of the e-PTFE fabric makes it have excellent waterproof, moisture permeable, and windproof functions, and truly achieve waterproof, moisture permeable, windproof and breathable, so that
The human body feels dry and comfortable, which is called "breathing fabric".
ePTFE membrane applications:
Polar scientific research clothing, fire protection clothing, military protective clothing, tents, sleeping bags, raincoats, high-end civilian raincoats, work shoes, leisure travel clothing, currently mainly used in outdoor products, military
high-end functional areas such as medical protection.
This article is originally created by Teflon's little sister. Welcome to pay attention and take you to grow knowledge together!
Key words:
Eptfe, waterproof, microporous, fabric, general, human body, structure, diameter, waterproof, windproof, breathable
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