Comparison of ACR Impact Modifiers and ACR Processing Aids
- Comparison of chemical structure and functional positioning
The core of ACR Impact Modifier is core-shell structure, the core is crosslinked acrylic rubber (such as polybutyl acrylate), and the shell is polymethyl methacrylate (PMMA) with high glass transition temperature. Its main function is to improve the impact resistance of plastic products, especially low temperature toughness, while having both weather resistance and stability .
ACR Processing Additives improve the melt fluidity and plasticization efficiency of PVC and other resins through the molecular chain entanglement of high molecular weight acrylic copolymer (such as MMA and acrylic copolymer), and solve problems such as melt cracking and surface defects during processing.
Comparative summary
- Impact modifier: focus on improving mechanical properties, absorb impact energy through rubber nucleus, cause silver streak or shear band ;
- Processing AIDS: focusing on optimization of processing performance, improving molding effect by promoting uniform plasticization of melt and increasing melt strength
- Applications & Performance
| Item | ACR Impact Modifiers | ACR Processing Aids |
| Typical Use | PVC profiles, pipes, outdoor building materials | PVC films, foamed boards, injection molding |
| Key Role | Boost impact strength (esp. low-temperature) | Accelerate plastification, reduce surface defects |
| Dosage | 6-8 phr（cost-effective） | 0.5-3 phr（low dosage） |
| Compatibility | Compatibility with PVC compatibility is good, does not sacrifice tensile strength | can be used in conjunction with other lubricants, stabilizers |
- Market Trends
Impact Modifiers:
Technology ugrade: Develop high weather resistance, transparent products (such as MBS replacement ACR), expand to engineering plastics (PC, PET) field ;
Environmental substitution: Gradually replace CPE (chlorinated polyethylene) to reduce the burden of chlorine on the environment
Processing Aids:
Functional compounding: development of multi-functional additives with lubrication and toughening to reduce the complexity of formulation;
Segmentation scenario: Launch special models for foaming, high-gloss and other needs (such as high-viscosity foaming regulator).
- Conclusion
Although ACR impact modifier and processing AIDS belong to the same acrylate additives, their core functions and market positioning are significantly different. Impact modifier is the "fortifying agent" of the mechanical properties of PVC products, and processing AIDS are the "catalyst" of processing efficiency. In the future, the two will respectively develop to high performance and multi-function, and jointly promote the upgrading of the plastic industry.