Preparation method of chlorinated polyvinyl chloride resin
A technology of chlorinated polyvinyl chloride and polyvinyl chloride, which is applied in the field of preparation of chlorinated polyvinyl chloride resin, can solve problems such as high chlorine content and environmental pollution, achieve low cost, simple post-treatment process, and increase chlorine content Effect
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[0022] According to the preparation method of chlorinated polyvinyl chloride of the present invention, there is no special requirement for the average degree of polymerization of polyvinyl chloride. In preferred cases, the average degree of polymerization of polyvinyl chloride can be 700-1200, preferably 850-1100. The PVC used in the present invention is commercially available, for example, one of conventional SG-5 type and SG-6 type can be used.
[0023] According to the preparation method of chlorinated polyvinyl chloride of the present invention, the amount of initiator and chlorination medium is not particularly limited, and in a preferred case, relative to 100g of polyvinyl chloride, the amount of initiator can be 0.3-0.8g , preferably 0.5-0.6g, the amount of chlorination medium can be 1-2L, preferably 1.2L. As an initiator, a persulfate such as ammonium persulfate or the like can be used. As the chlorination medium, hydrochloric acid with a concentration (mass fraction)...
Embodiment 1
[0040] Add 125g SG-5 type PVC and 1.5L deionized water into a 5L enamel kettle, stir to form a stable suspension, then add 0.625g ammonium persulfate and 1.5L hydrochloric acid to the solution, seal it and start stirring. Under the pressure of 0.3 MPa in the kettle, check that there are no obvious leaks in the kettle and the pipeline, open the valve of the tail gas pipeline, and raise the temperature to 35°C at the same time. Exhaust nitrogen, introduce chlorine gas after heating up the reactor, keep the pressure of 0.2-0.25MPa in the reactor, and control the flux of chlorine in the reactor. When the reaction kettle was warmed up to 90°C, the heating was stopped. The kettle temperature is 95-101°C. Chlorination reaction to 11 hours, stop logical chlorine. Open the tail gas valve, pass nitrogen into the kettle to replace the residual chlorine and hydrogen chloride in the kettle, and at the same time feed cooling water into the jacket pipe to reduce the temperature of the kett...
Embodiment 2
[0042] Add 125g SG-5 type PVC and 1.5L deionized water into a 5L enamel kettle, stir to form a stable suspension, then add 0.625g ammonium persulfate and 1.5L hydrochloric acid to the solution, seal it and start stirring. Under the pressure of 0.3 MPa in the kettle, check that there are no obvious leaks in the kettle and the pipeline, open the valve of the tail gas pipeline, and raise the temperature to 35°C at the same time. Exhaust nitrogen, introduce chlorine gas after heating up the reactor, keep the pressure of 0.2-0.25MPa in the reactor, and control the flux of chlorine in the reactor. When the reaction kettle was warmed up to 90°C, the heating was stopped. The kettle temperature is 95-99°C. When the chlorine flow gradually decreases, the amount of the chlorine bottle remains unchanged, and the reaction reaches 5 hours, it can be judged that the chlorination reaction has reached the end. Stop the chlorine flow, open the tail gas valve, pass nitrogen into the kettle to ...
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