The processing aid ACR and the impact modifier ACR are both acrylate polymers, but their properties are quite different due to their different formulations and structures. The impact modifier ACR contains about 10-20 percent methyl methacrylate and 80-9 percent acrylate, which has a core shell structure with hard outside and soft inside. Impact modifier AcR dosage is generally 6-8 parts, its main function is toughening.
The main function of ACR is to promote plasticizing. ACR is also made of methyl methacrylate, acrylic ester copolymerization, high polymer or containing a small amount of styrene and other components. Molecular weight is one of the main factors affecting the promotion of melting, molecular weight decline, promote plasticizing ability increase, melting time shortened. But its molecular weight is far more than the molecular weight of resin, and reduce the viscosity of resin, improve the fluidity of other additives, such as plasticizer, lubricants have different modification mechanism.
Pure PVC or PVC with PVC heat stabilizer and lubricant only. In a wide range of temperature, the coefficient of friction with metal is low, it belongs to the sliding wall resin. And add processing AIDS ACR PVC only at 160 degree or so can become adhesive resin. The compatibility between processing AIDS and PVC particles is good, and the two glue each other, transmit shear stress between PVC particles, promote the rupture of multiple structures, to achieve the purpose of uniform plasticizing.
