The materials of each layer are as follows:

1: glassfabric fiberglass base cloth

2: base coat adhesive layer

3: PTFE coat PTFE coating

4: topcoat surface modified coating, such as: TIO2 coating, there are PP modified coatings abroad, but they are rarely used.

The following focuses on the main parts of PTFE membrane materials: glass fiber base cloth and PTFE coating

Glass fiber base cloth:

Glass fiber base cloth Cloth, the factors that determine the performance of glass fiber base cloth:

1. Diameter of glass fiber

Commonly used glass fibers have two specifications: 6 mm diameter glass fiber strands and 3 mm diameter glass fiber strands. Millimeter diameter glass fiber strands, namely EC6 and EC3. Generally speaking, 3mm fiberglass woven cloth is better and the cost is slightly higher. The smaller the diameter of the glass fiber strands, the thinner and denser the base fabric, the better the performance and the better the appearance.

2. The purity of the glass fiber. The lower the alkali content of the glass, the higher the strength. The higher the alkali content, the softer the fiber and the easier it is to weave.

3. Weaving density: Flat weaving (PL) is used for glass fiber weaving, and mixed weaving is rare.

Commonly used glass fiber base cloth:

PTFE coating:

PTFE product name: polytetrafluoroethylene;

English name ：Polytetrafluoroethylene;

Alias: PTFE, Teflon, Teflon, teflon, Teflon, F4, King of Plastics, テフロン (Japanese);

The English abbreviation is PTFE , the brand name Teflon, the Chinese translation varies from place to place: Mainland China translates it as Teflon, Hong Kong translates it as Teflon, Taiwan translates it as Teflon

PTFE molecular structure:

Polytetrafluoroethylene Polyethylene fluoride (PTFE) is one of the materials with the best corrosion resistance in the world today, so it is known as the king of plastics. It has a high degree of chemical stability and excellent resistance to chemical corrosion, such as resistance to strong acids, strong alkali, strong oxidants, etc. It has outstanding heat resistance, cold resistance and wear resistance, with a long-term use temperature range of -200-250°C. It also has excellent electrical insulation and is not affected by temperature and frequency. In addition, it has the characteristics of non-stick, non-absorbent and non-burning.

Suspension resin is generally formed and processed by molding and sintering. The obtained rods, plates or other profiles can be further processed by turning, drilling, milling and other machining methods. The rods are then turned Stretching can produce oriented films.

Polytetrafluoroethylene (PTFE) characteristics:

1. Strength (high strength-to-weight ratio)

2. Chemical inertness

3. Biological adaptability

4. High thermal resistance

5. High chemical resistance in harsh environments

6. Low flammability

7. Low friction coefficient

8. Low dielectric constant

9. Low water absorption

10. Good weathering properties

Chemical properties: The F atom in the PTFE molecule covers the C-C bond and the C-F bond energy is high and particularly stable. It is not corroded by any chemicals except alkali metals and elemental fluorine. The F atom in the PTFE molecule is symmetrical, and the two elements in C-F are combined with valence. There are no free electrons in the molecule, and the entire molecule is neutral. PTFE has excellent dielectric properties because there are no gram bonds in the molecular structure of PTFE, so its crystallinity is very high. Because there is an inert fluorine-containing shell outside the PTFE molecules, it has outstanding non-stick properties and low friction coefficient.

Insulation: not affected by environment and frequency, volume resistance up to 1018 ohm cm, small dielectric loss, high breakdown voltage.

High and low temperature resistance: The effect on temperature does not change much, the temperature range is wide, and the usable temperature is -190~260℃.

Self-lubricating: It has the smallest friction coefficient among plastics and is an ideal oil-free lubricating material.

Surface non-stickiness: No known solid material can adhere to the surface. It is a solid material with the smallest surface energy.

Atmospheric aging resistance, radiation resistance and low permeability: the surface and performance remain unchanged after long-term exposure to the atmosphere.

Optical properties: PTFE absorbs light, mainly absorbing ultraviolet rays and turning white.

Polytetrafluoroethylene (PTFE) core production company: DuPont (PTFE was invented by DuPont)

To sum up, it can be concluded that the base fabric of PTFE membrane material Features:

1. Light weight: its weight is only a small part of traditional building materials, and the weight per square meter will not exceed 1.5KG;

2. High strength: glass fiber is The strongest among textile fabrics, it is even stronger than steel wire of the same diameter;

3. Flexibility: Unlike most solid building materials, PTFE membrane is stretched into various dynamic arcs Line shape;

4. Light transmittance: Through the uniform light transmission of the inner and outer surfaces, soft scattered light is formed;

5. High self-cleaning: During the service life of the fabric, Only minimal cleaning is required. Because the surface of the fabric is non-sticky and taut at the same time, the rain will wash away the dust;

6. The surface is completely inert: Harsh environments, such as mold, acid rain, etc. will not affect the fabric. The surface works;

7. Weldability: Each fabric frame will be welded together to form an integrated large ceiling, and the strength of the weld will be greater than the fabric itself;

8 , Long service life: During its service life, PTFE-coated glass fabric has almost no degradation and can be used for at least 25 years;

9. Fire protection performance: Fire protection B1, some can reach A2.