Impact Modifier MBS Resin For PVC And The Mechanism Of MBS Toughening Plastic
Impact Modifier MBS Resin For PVC and The mechanism of MBS toughening plastic
MBS additives are commonly known as MBS resin. As one of the most important impact modifiers of PVC, MBS resin can maintain the transparency of PVC at the same time as toughening, and at the same time, compared with other impact modifiers, Can be more substantial to enhance the toughness of products, which is widely used in PVC and PBT / PC and other engineering plastics processing applications.
MBS resin is a functional polymer material synthesized on the basis of particle design concept. It is a ternary polymer prepared by emulsion graft polymerization. The submicron morphology has a typical core-shell structure. The core of the particle is that it is subjected to mild crosslinking With a low shear volume of styrene-butadiene rubber core, mainly to improve the role of polymer impact toughness. The shell is the hard shell formed by grafting styrene and methyl methacrylate. The main role of MMA in the shell is to improve its compatibility with PVC, so that MBS can be uniformly dispersed in PVC body; St is mainly to improve the MBS Resin refractive index to MBS has a similar refractive index with PVC, so MBS resin is a typical particle dispersion toughening modifier. It is semi-compatible with PVC two phases, that is, with PVC resin has a good interface compatibility, but also in the PVC / MBS system to maintain the integrity of the particle shape. MBS added a small amount of good dispersion in the PVC ball particles, not a decentralized "sea - island" structure, can not achieve the role of impact energy, material toughening effect is not good. With the addition of MBS resin, the dispersed particles gradually coalesce to form the island structure. When the material is subjected to external impact, the rubber core in the MBS resin is the stress concentration point, causing it to deform, and in the surrounding induced crazing and shear zone, through the crazing and shear zone to disperse and absorb the impact energy, forming the material From brittle fracture to ductile fracture, so as to achieve the purpose of toughening.