How to Choose Plastic Whitening Agent?
1) How to Choose Optical Brightener for Polyolefins
2) How to Choose Optical Brightener for PVC
It is worth noting that same optical brightener gain different whitening effect in rigid PVC (RPVC) and flexible PVC (FPVC). Bisbenzoxazole or phenyl coumarin group are often used in PVC. When PVC powder, heat stabilizer, fluorescent brightener agent dry mixed together, optical brighteners were evenly dispensed. For flexible PVC, OBAs were dissolved or dispersed into plasticizer. It is better to add FWAs in masterbatch form. For transport PVC, optical brightener plus plasticizer masterbatch or OBAs plus PVC masterbatch were used.