Research Status toxic PVC heat stabilizers

Research Status toxic PVC heat stabilizer of PVC is the world's second largest synthetic resin polyethylene production after more than 90,000, however, PVC, there are some shortcomings difficult to overcome, including poor thermal stability was most prominent . PVC due stearic acid  to poor thermal stability, softening temperature and decomposition temperature difference is small, has caused great difficulties to the process, so the process must be added a certain amount of heat stabilizers to improve its thermal stability. Currently, lead salt is the largest amount of heat stabilizer. In building a harmonious society and ensure the sustainable development of the premise that people's awareness of environmental protection and health gradually strengthened, therefore, low toxicity, no pollution, has become complex and efficient development direction of PVC heat stabilizers.
Thermal stability of PVC resin is Polyethylene wax  one of the oldest synthetic thermoplastics, has difficulty burning, good mechanical properties, low prices, abundant sources of raw materials, synthetic mature technology, which is widely used in construction, telecommunications, transportation, electronics , chemicals, packaging and other industries. PVC heat stabilizers in the heat or subjected to high energy radiation, such as ultraviolet light, "the impact of de-hcl autocatalytic reaction occurs, the thermal decomposition mechanism is generally believed that there are PVC stabilizer for panel  three kinds of radical mechanism oxygenated environment;. (2) ion mechanism under a nitrogen atmosphere; main factors (3) single molecular mechanism under vacuum conditions affect the thermal decomposition is pvc chain structure, refers to a branched, double, allyl chloride, head structure and molecular weight of conjugated double bonds etc. "effect; addition, oxygen, HCL additives and other external factors also have an impact.