At present, some enterprises are still using LDPE (1f7b) as the carrier resin, which is important because this brand of resin has a low melting point and a high melt flow rate (7g/10min).
However, the high melting temperature of polypropylene (20~40℃ higher than the general polyethylene) limits its application in polyethylene plastics, and the melting point of random polypropylene or powder polypropylene synthesized by liquid phase bulk method does not exceed 100℃, so it is widely used as the carrier of anti-blocking masterbatch.
LDPE (1f7b) is an anti-blocking masterbatch carrier resin, its biggest advantages are low melting point, high melt flow rate, and high melt strength, but the outstanding disadvantage is its high price. If low-density polyethylene resin with a low melt flow rate and low cost is selected, such as 1i2a-1 or 2f2b, etc., due to their low melt flow rate, generally about 2g/10min, more paraffin wax and other additives need to be added during processing, to facilitate better dispersion of masterbatch in matrix resin.
Usually using polyethylene is the carrier to make the filler masterbatch, more suitable for polyethylene plastic products, the important reason is that the carrier resin and matrix resin performance is the same, with good compatibility. The filling master material for polyethylene film has higher and stricter requirements on the carrier resin.