toxic PVC heat stabilizers Research Status and Development Trend

Polyethylene, polyvinyl chloride PVC is second only to the world's second-largest synthetic resin production over 90,000, however, PVC there are some difficult to overcome the shortcomings of poor thermal stability which was most prominent. PVC due to poor thermal stability, softening temperature and decomposition temperature difference is small, has caused great difficulties to the process, so the machining process must be a  flame retardant certain amount of heat stabilizer in order to improve its thermal stability. Currently, the largest amount of lead salt heat stabilizer. In building a harmonious society and to ensure sustainable development in mind, people's awareness of environmental protection and health gradually strengthened, therefore, low toxicity, no pollution, has become a complex and efficient PVC heat stabilizers direction of development.
Analysis of the thermal stability tribasic lead sulphate  of PVC resin
PVC imminent completion of the laboratory synthesis, is one of the earliest synthetic thermoplastics, with difficult to burn, good mechanical properties, low prices, abundant source of raw materials, synthetic process maturity and other characteristics, widely used in construction, telecommunications, transportation, electronics, chemicals, packaging and other industries. PVC heat stabilizer to heat or high-energy radiation, such as ultraviolet light "effect occurs under the autocatalytic reaction hcl off, the PVC foaming board stabilizer  thermal decomposition mechanism generally believed that there are three kinds. Oxygen environment of the free radical mechanism; (2) ion mechanism under a nitrogen atmosphere; (3) of the single vacuum molecular mechanisms that affect the thermal decomposition pvc chain structure is the main factor, means branched, double, allyl chloride, head structure of conjugated double bonds and a molecular weight etc. "effect; addition, oxygen, HCL additives and other external factors also have an impact.