How to achieve waterproof effect of PVC three-proof tarpaulin?

When designing and using PVC three-proof tarpaulin, it is necessary to consider the air permeability of the tarpaulin. The factors affecting the air permeability are related to the base fabric structure, density, material, type of waterproof finishing agent, and the amount of resin adhesion. Generally, the air permeability tarpaulin Most of the products are finished with paraffin or acrylonitrile resin. The PVC three-proof tarpaulin needs to bear various tensions when it is used. When it is fixed, it needs to be under tension. During the use process, it needs to be affected by wind and rain. This requires the tarpaulin to have good tensile strength, and it is required to keep the original Some star creations will not easily deform. As a roof tent and a large tent, it is often used under tension, and the elongation of the fabric should not be too large, and its dimensional stability is determined by the creep characteristics of the material. The standard raw material composition of PVC three-proof tarpaulin is a cloth blank woven by hand with tensile strength polyester cloth, which is appropriately matched with other small amounts of chemical raw materials to produce and process. PVC three-proof tarpaulin is a tarpaulin that is produced and processed to be waterproof or moisture-proof and frost-proof. It is made of fiber materials and organic chemical filling raw materials, and is made through the production and manufacturing process. The key component of PVC tarpaulin is polyethylene. In the production and processing of PVC tarpaulin, many auxiliary materials such as plasticizers and anti-aging agents are added to improve its performance. The surface layer is viscous epoxy resin and other additives. It has weather resistance and good reliability. How to achieve waterproof effect of PVC three-proof tarpaulin? 1. PVC three-proof tarpaulin is often seen in daily life. In the state of water vapor, the water particles are very small. According to the principle of capillary motion, it can smoothly penetrate into the capillary to the other side, thereby causing the phenomenon of vapor permeability. 2. When the water vapor condenses into water droplets, the particles become larger. Due to the surface tension of the water droplets, the water molecules cannot smoothly escape from the water droplets and penetrate to the other side, which means that the penetration of water is prevented, so that the vapor permeable membrane has waterproof function. 3. A drop of liquid drops on a solid surface, assuming that the surface is ideally flat, the gravity of the droplet is concentrated at a point, and the amount of the field is ignored. As a result of the interaction of the surface tension (Ys) of the fibers in the fabric, the surface tension of the liquid (YL), and the interfacial tension (YLS) of the fasteners, the droplets can take a variety of shapes (from cylindrical to fully flattened) ). 4. Except that the ground is completely leveled at night, when the droplet is in equilibrium on the solid surface, the point A receives the action of decentralization. 5. The angle 0 is called the contact angle. When 0=00, the droplet is flat on the solid surface, which is the limit state of the solid surface being wetted by the field; when 0=1800, the droplet is cylindrical, which is An ideal non-wetting behavior. 6. In the water-repellent finishing, the surface tension of the droplet can be regarded as a constant. Therefore, whether the field can wet the solid surface, go to the relay tension of the late lotus leaf in the bank with the solid surface. 7. According to the said requirements, the larger the contact angle 0, the more conducive to the rolling loss of water droplets, that is to say, the smaller the better. The coating of PVC three-proof tarpaulin is to coat the resin on the base material woven cloth in a molten state, and only coat the molten resin on the woven cloth and cool it immediately to obtain a two-in-one woven cloth. When compounding, the molten resin film is sandwiched between woven cloth and paper or plastic film, and then cooled to obtain a three-in-one woven cloth. The flat fabric can be coated on one side to obtain a sheet cloth. The coated PVC three-proof tarpaulin can be printed, cut, sewed to support various bag types, and the wide-width coated tarpaulin can also be rolled up as a tarpaulin to leave the factory. Coating process indicators are mainly temperature, pressure, thickness control, coating peel strength and so on. When the PVC three-proof tarpaulin is pulled out of the water tank and rolled on the film roller on the drafting machine, when the flat film is clean and spotless, the flat film is pulled through the slitting frame and the wire guide roller. With the more and more extensive application of various optoelectronic technologies in military detection equipment, higher requirements are put forward for the camouflage protection of military weapons and equipment. Therefore, it can no longer meet the needs of modern national defense development. In order to better protect weapons and equipment in the state of storage, transportation and lighting, more and more attention has been paid to the stealth of equipment, and stealth fabrics are cheap and easy to use, which has become an urgent need of the army. Greatly reducing the weight of army tarpaulins, improving the service life of the tarpaulins, and enhancing the troops' quick response capabilities are of great significance to high-tech warfare. The new tarpaulin mainly achieves stealth performance by adding stainless steel fibers. Stainless steel fibers are anisotropic, have dielectric loss and magnetic loss, and are a material with better Hi-wave performance.

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