PVC masterbatch coloring

PVC masterbatch granular and pie.The former is the other additives in PVC resin pigments mixed screw extruder mixing granulator from greatly improved mobility,good dispersion,good uniformity,measurement, pollution-free;latter high concentration pigment with PVC and other additives in a three-roll mill or extruder kneading,there is a better dispersion.

1) granular PVC masterbatch composition

Due to oil absorption amount of various pigments,the plasticizer is added in an amount not the same,depending on the user requirements, the pigment content may be depending on the ease of processing of the various pigments,carbon black is generally 30%,an iron oxide of 70%.

Carrier selected special polyester class or better mobility SPVC SG-6 or 3G7;plasticizer selected the universal good phthalate,dioctyl ester (DOP);pigment requirements for the selection of temperature resistance 160 ~ 220 ℃,without the HCl affect,migration resistance,good weatherability.

Considering the selection of a complex type of metal soaps as a heat stabilizer,BM-1 is a polymeric dispersant,can improve the processing performance,to increase the fluidity,and to reduce the viscosity of the system in the stabilizer.

2) process

PVC masterbatch preparation process for the Using a common twin-screw extruder for the preparation of high concentration PVC masterbatch,takes advantage of the kneading blocks in the screw to the dynamic mixing of the materials,the abrasive blocks,the refinement and dispersion of the pigment,and final output stably dispersed uniform material Preparation of PVC masterbatch,screw temperature of 170~175 ℃ appropriate.

3) PVC pie masterbatch

Pie the masterbatch chosen degree of polymerization of 840 to 1100 suspension PVC (SPVC) as the carrier.The amount of plasticizer depends on the quality of the masterbatch,the plasticizer DOP or PBP 90% to 100%.The amount of pigment in addition to the carbon black, titanium dioxide,chrome yellow outer inorganic pigment is 60% to 70%, from 40% to 50% of the organic pigment.Stabilizer 2.5% Liquid Ba-Zn, lubricant 0.5%.

By Sabrina