PVC is more and more widely used in people's daily life, especially in the construction industry. PVC products gradually replace other old materials, such as PVC anti-collision handrails, pvc wall panels, PVC corner guards and so on. So what are the characteristics of PVC? How are they classified?
PVC is a kind of plastic widely used in construction. It is a multifunctional material. By changing the formula, it can be hard or soft. PVC is easy to decompose under the action of light and heat during processing or use. Therefore, stabilizer must be added to PVC plastics to prevent and inhibit the decomposition of PVC. In addition to stabilizers, plasticizers, lubricants and other compounding agents are also added to PVC plastics as needed. PVC resin has good solvent resistance. Some solvents can dissolve PVC, but the dissolution is not strong. The commonly used solvents are tetrahydrofuran and cyclohexanone, which can be prepared into solution as solvent binder.
PVC resins can be divided into two categories according to different polymerization methods. One is prepared by suspension polymerization, with large resin particles and powder appearance, also known as powder resin or suspension resin. The other is produced by emulsion method, with fine particles, commonly referred to as paste resins.
PVC plastic products are divided into hard PVC and soft PVC plastic. The former basically contains no plasticizer, also known as unplasticized PVC. Its mechanical properties are quite good, but its impact resistance is poor, especially at low temperature. In rigid PVC products such as plastic doors and windows and building pipes, some modified resins are usually added to improve its impact resistance. The softness of soft PVC products varies greatly with the plasticizing dose.