Preparation of high-amylose regularity polyvinylidene fluoride
A polyvinylidene fluoride and initiator technology, applied in the field of initiator system for polyvinylidene fluoride polymerization with high chain regularity, can solve the problem of poor mechanical properties, processing properties and weather resistance, low structural defects, and unstable terminal groups and other problems, to achieve the effect of good thermochemical stability, high chain regularity and easy control
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Embodiment 1
[0014] Embodiment 1: Take the polymerization still of 10L as example, add 7.2kg deionized water and 1kg concentration in the polymerization still of cleaning and be the oxidant cumene peroxide solution and other auxiliary agents of 3.0%; Evacuate, remove oxygen, When the oxygen content is less than or equal to 20ppm, it is qualified; then raise the temperature of the polymerization kettle and add the monomer at the same time. After the kettle temperature and pressure of the polymerization kettle meet the process requirements, use a metering pump to quickly inject 500g of the prepared reducing agent sodium hypochlorite with a concentration of 3.0%. solution, start the polymerization reaction, the temperature is 70°C, the pressure is 3.0Mpa, and then the remaining 3.0% reducing agent sodium hypochlorite solution is poured in at a constant speed with a metering pump. During the polymerization reaction, keep the temperature and pressure of the kettle constant, and stop the reaction...
Embodiment 2
[0015] Embodiment 2: change reducing agent sodium hypochlorite solution concentration to be 2.0%, and consumption is 2kg; The consumption of cumene peroxide is 1kg, and concentration is 3.0%; Oxidant consumption is 2.5% of monomer gross mass, temperature 130 ℃; Reaction Pressure is 5.5MPa Others carry out the same operation with practical example 1.
Embodiment 3
[0016] Embodiment 3: change oxidizing agent to be dialkyl peroxycarbonate, its concentration 3.0%, consumption is 1kg; Reducing agent sodium hypochlorite solution concentration is 3.0%, consumption is 1kg; Oxidant consumption is 2.5% of monomer total mass, temperature 50 ℃; the reaction pressure is 2.5MPa, and other operations are carried out in the same manner as in practical example 1.
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