ACR is a kind of PVC processing aid
ACR is also a processing aid and is used industrially. How much do you know about the features and effects of ACR?
The ACR product is a PVC processing aid and it is a "core-shell" structural copolymer. It is a kind of acrylic ester copolymer. Compared with PVC molecules, its molecular weight is relatively high, generally about 1 million to 8 million (weight average molecular weight), and the true density is 1.05 g/cm3 to 1.20 g/cm3. Its preparation is based on various types of acrylate and crosslinking agents, emulsifiers, initiators, molecular weight regulators and other raw materials, after multiple emulsion polymerization to obtain white non-toxic, non-corrosive powder. For example, ACR-201 is a graft copolymer of MMA and acrylate; ACR-301 is composed of MMA and EA and BA (butyl acrylate); ACR-401 is composed of MMA and BA, BMA (butyl methacrylate). ) and EMA (ethyl methacrylate) composition.
The effect of impact modification is significant: the addition of a small number of parts can obtain higher normal temperature and low temperature impact strength.
A wider processing temperature range
Low film swellability: The ACR/PVC blend system has a smaller outlet swell, lower heat shrinkage and dimensional stability, and is suitable for high-speed extrusion of profiled materials.
ACR's role in PVC processing
In the processing of PVC, 1% to 5% of processing aids of PVC resin should be added. ACR is the most widely used processing aid, and it is the main processing method of PVC in extrusion, injection molding, blow molding, blister injection, and calendering. It has been extremely widely used. For the mechanism of action of ACR as a processing aid to modify PVC, the general view is that ACR adheres to the PVC resin particles through a long molecular chain, and transfers the external heat and shear forces to the resin to promote its melting and plasticization. , reduced processing
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