PVC (polyvinyl chloride) is a widely used plastic material, and extrusion is one of the key processes in the production of PVC products. The extrusion process is to heat and melt PVC resin and various additives through an extruder, then shape them through a mold, and finally cool and solidify them into products of the required shape and size. In this process, stabilizers play a vital role.
1. Thermal stabilization
During the extrusion process of PVC, due to the action of high temperature and mechanical force, thermal degradation will occur, resulting in a decrease in product performance. Stabilizers can effectively inhibit this thermal degradation and ensure that PVC maintains stable performance during the extrusion process.
2. Oxidation stabilization
During the processing and use of PVC, it will also be oxidized by the action of oxygen, causing the product to become discolored and brittle. Stabilizers can capture free radicals and prevent oxidation reactions from occurring, thereby ensuring the stability and durability of PVC products.
3. Photostabilization
During the use of PVC products, they will also be affected by ultraviolet rays and undergo photodegradation, resulting in a decline in product performance. Stabilizers can effectively absorb or reflect ultraviolet rays, prevent photodegradation, and ensure the service life of PVC products.
There are many types of stabilizers, mainly divided into organotin stabilizers, lead salt stabilizers, calcium zinc stabilizers, etc. Different stabilizers have different characteristics and application ranges, and they need to be selected according to the specific PVC products and extrusion process.
Selecting and using appropriate stabilizers is crucial to ensuring the quality and performance of PVC extruded products. When choosing a stabilizer, you need to consider factors such as the type of PVC, the conditions of the extrusion process, and the use of the product. When using stabilizers, you need to pay attention to factors such as the amount, method of addition, and processing temperature to ensure that the stabilizer can fully exert its effect.
Stabilizers play a key role in the PVC extrusion process and can effectively ensure the quality and performance of PVC products. By understanding and mastering the functions and selection methods of stabilizers, we can better produce and apply PVC extruded products.
