Because of its high chemical stability, it can be used to make anticorrosion pipelines, pipe fittings, oil pipelines, centrifugal pumps and blowers. Polyvinyl chloride (PVC) hard board is widely used in the chemical industry to make the lining of various storage tanks, corrugated board of buildings, door and window structures, wall decoration and other building materials. Because of its excellent electrical insulation performance, it can be used to manufacture plugs, sockets, switches and cables in electrical and electronic industries. In daily life, PVC is used to make sandals, raincoats, toys and artificial leather. Basic features:
It is one of the largest plastic products in the world, which is cheap and widely used. PVC resin is white or light yellow powder. Different additives can be added according to different uses, and PVC plastics can show different physical and mechanical properties. Adding a proper amount of plasticizer into PVC resin can make various hard, soft and transparent products.
The density of pure PVC is 1.4G/CM3, and the density of PVC plastic parts containing plasticizer and filler is generally 1. 15-2.00G/CM3.
Rigid PVC has good tensile, bending, compression and impact resistance, and can be used as structural material alone.
The softness, elongation at break and cold resistance of soft PVC will increase, but the brittleness, hardness and tensile strength will decrease.
Pvc has good electrical insulation performance, can be used as low-frequency insulation material, and has good chemical stability. Due to the poor thermal stability of PVC, long-term heating will lead to decomposition, release HCL gas and discolor PVC, so its application range is narrow, and its application temperature is generally between-15~55 degrees.
Construction method: There are three construction methods for this product: bonding method, empty paving method and mechanical fixing method. Joints are usually welded. A) Bonding method: The coiled material is directly bonded to the base by adhesive, and the bonding method can be divided into full bonding method and local bonding method. Full adhesion method is a construction method in which both the coil and the base are adhered to the base. During construction, firstly, the coiled material shall be pre-paved, and the PVC coiled material shall be laid flat on the base, with a longitudinal lap width of 5CM, and appropriately cut; Adopt transverse butt joint treatment and lap joint with non-composite PVC with a width of 20CM-25CM. Secondly, the long side of a coil is folded in half (about 10M), and a layer of glue is coated on the base and PVC coil surface with a rubber roller from the folded position. When the glue is half dry and does not stick to hands (about 3-4 min), fold the pre-glued surface, compact it with a press roller, and glue one end and the other end, and so on. Finally, weld the seam with a welding gun. B) Blank paving method: the coiled material is bonded to the base only within the specified width around. During construction, pre-paving (refer to full-paste method) shall be carried out first, with longitudinal lap width of 5CM, transverse butt joint treatment and lap welding with non-composite PVC with width of 20 cm-25 cm. C) Mechanical fixing method: it is a method of connecting the coiled material with the base with mechanical fasteners. During construction, pre-paving shall be carried out first, and the longitudinal lap width shall be 10CM, of which 5CM shall be used for fixing parts, so that the fixing parts can be covered under the waterproof layer. Secondly, according to the distance calculation, punch holes with an impact drill with a diameter slightly smaller than the outer diameter of the fixed steel nail, put the fixed parts in place, reinforce them with an electric screwdriver, and so on, and weld the overlapping edges firmly; It is welded with non-composite PVC with a width of 20CM-25CM by transverse butt welding. D) d) Welding process of PVC waterproofing membrane: the welding nozzle forms an angle of 45 with the welding direction, and the pressure roller is parallel to the welding nozzle, and a certain distance (about 0.5CM) is kept, and the rolling speed should not be too fast. Generally, the small nozzle (nozzle width is 20MM) is welded twice, each welding width is 15-20 mm, and the large nozzle (nozzle width is 40MM). Only by ensuring the effective welding width can the quality meet the requirements.