it is used for polymer modification such as up、ps、abs and so on.
original polymerization: disperse the organic montmorillonite powder in pre monomer or monomer with a stirring machine. in order to disperse more easily, you can add 20-30% of organic soil with high polarity and low molecular weight auxiliary dispersing agent such as ethanol, propylene carbonate (pc) and so on. make it fully dispersed through high shear, and then polymerize and cross linking according to the normal regulations.
twin screw melting extrusion modification: make the organic clay powder and polymer pellets fully mixed (in order to make the powder adhere on aggregate, join 0.5-1% of liquid paraffin or corresponding titanate coupling agent mixed with aggregate, then add organic soil powder). if there is a side inlet of the double screw extruder, organic clay can also be directly add into the export side metering of the double screw extruder. control the temperature at each stage and speed up it, melt extruded. the amount of organic clay addition is generally 3-6%
the double screw machine should have a bigger ratio of length / diameter as far as possible and a high shear screw structure. the melting temperature should not be too high, to keep the polymer in the extrusion process achieve higher shear strength in order to guarantee the strong shear functions of polymer and make montmorillonite layers exfoliated.
screw extruder should have vacuum exhaust system to timely discharge gases which can be generated in the process of extrusion and guarantee the quality of the squeezed materials.
brown paper packages plus internal polyethylene film bags, or paper packages with valve mouths are used. the weight of each package is generally 25±0.25kg according to customer demands. keep it in dry places with the temperature of 0~30℃. the quality is valid for 24 months.
