Study Of The Thermal Hazard Of Polymerization Initiators

Polymerization initiator is a substance which is easier to decompose into radicals by heating. The radicals can cause alkene, double alkene monomer free radical polymerization and copolymerization reaction, also can be used for crosslinking curing of unsaturated polyester and macromolecular crosslinking reaction. Polymerization initiator plays an important role in the development of chemical industry. But the polymerization initiator with low decomposition activation energy, short half-life and great heat release has the high potential risk. The improper control of the conditions of the use, storage and transportation is very easy to cause safety accident, influence people’s life and property safety. So, in order to control the polymerization initiator safely and effectively, to avoid their potential dangers, it is very meaningful to analyze the thermal hazard of polymerization initiator.This subject put forward a program of the thermal hazard of polymerization initiator based on the formers research and combined with the present experimental conditions. According to the program, this subject mainly research on the following four aspects:(1) Using the method of oxygen balance vlues to assess the thermal hazard of typical polymerization initiators. Understanding the thermal hazard of the polymerization initiators in the theoretical predictions.(2) Using C600 microcalorimetric instrument to measure the thermal decomposition of several kinds of typical polymerization initiators. According to the experimental data, the thermal stability parameters of these materials are gained. And then preliminary evaluate their thermal hazard.(3) Based on the thermodynamics parameters, analysis thermal safety parameters of polymerization initiator: activation energy(Ea)、arrivalling time of the maximum reaction rate under the condition of adiabatic(TMRad)、Self-accelerating decomposition temperature(SADT). Comprehensively and deep understand their thermal hazard.Among them LPO、H2O2 and ABVN are likely to have the thermal runaway reaction at room temperature under the condition of adiabatic, so they must be refrigerated. While other materials are less likely to occur thermal runaway at room temperature, the thermal decomposition of heat quantity is very big, to be on the safe side, keep ventilation and Control the temperature.Under different packaging specifications SADT simulation shows that the greater the packaging specifications, the smaller the SADT value, the higher the possibility of thermal runaway reaction, So in the production, use, storage and transportation links the packing specifications and the temperature should be strictly regulated and controlled.(4) Studied the thermal hazard influence of the water, acid, sodium hydroxide, sodium chloride, iron and rubber to typical polymerization initiator, it is concluded that the compatibility relationship between impurities and polymerization initiator. Test the influence of friction and impact on thermal hazard of polymerization initiator.All in all, this research is conducive to a comprehensive understanding of thermal hazard of polymerization initiators and in the process of production, use, storage and transportation the influence of the impurities, friction and impact on its thermal hazard. For safe and efficient use of polymerization initiator and avoiding dangerous accident, the subject provides a certain amount of data to support.