(Acrylic Processing Aids from Novista Group)
From the broad category, PVC processing aids ACR can be divided into three categories:
1. Promote plasticizing processing aids: This type is widely used in rigid PVC products. Its main function is to promote plasticization, improve melt rheological properties and improve the dispersibility of other additives, and improve the apparent quality of products.
Applicable to most of the PVC products such as profiles, pipes, plates (rolls), reference dosage 1-2phr. 2. Foaming regulator: PVC foaming regulator can greatly increase the melt strength of PVC material due to its high molecular weight, thus effectively encapsulating the foaming gas to form a uniform honeycomb structure and prevent gas from escaping. PVC foaming regulator is also beneficial to the dispersion of other additives including foaming agents, improving the surface quality of products and improving gloss.
Suitable for foamed sheet, foamed bar, foamed pipe, foamed profile, foamed wood and plastic, etc., reference dosage 4-8phr. 3. External lubrication type Processing Aid: It has the same good metal stripping property as oxidized polyethylene wax. The difference is that it has good compatibility with PVC, and can also increase processing plasticizing performance and improve melt in a certain extent. Rheological properties, and the outlet expansion does not change during extrusion processing, does not change the thermoforming performance, and prevents the haze effect caused by the precipitation of the slip agent in the transparent products.
It is suitable for formulas or equipment with high processing requirements, especially transparent sheets, foamed profiles, foamed sheets and foamed wood plastics. Reference dosage 0.5-2phr.
