Preparation of sulfur-modified powdered CR by reverse-coagulation cover method:I.Particle size distribution

A sulfur-modified powdered CR (PCR-121) was prepared by reverse-coagulation cover method and the effect of the latex adding procedure and speed,and the stirring speed on the particle size distribution of product was investigated.A reverse-coagulation powder model of CR latex was established.The model was verified by uniform experimental design method.The results showed that the model could be used to simulate the reverse coagulation powdering process of CR latex effectively;the mass fraction of medium particle (1 to 3 mm) was only related to the stirring speed,i.e. the medium particles were generated mainly by the turbulent decrepitation of latex drop and the large and small particles were generated mainly by the ribbon tension.It was found by SEM that the PCR-121 particles were continuous single particles,which were coagulated from the single CR latex drops.