Grafting Compounding
Twin screw lines that graft maleic anhydride (MAH) onto PP or PE inside the extruder. The product is the coupling agent for fibre- and mineral-filled PP, and the compatibilizer for polymer alloys.
- PP-g-MAH · PE-g-MAH
- Liquid dosing
- Vacuum degassing
Four ingredients, one reaction
The peroxide opens sites on the polymer chain; MAH attaches there. Acetone carries both into the extruder as one liquid.
- PP / PE
- MAH
- DCP
- Acetone
- Additives
PP / PE
The backbone that is grafted.
Maleic anhydride (MAH)
The polar group grafted onto the chain.
DCP
Dicumyl peroxide, the initiator.
Acetone
Solvent for MAH and DCP; removed under vacuum.
Polymer and liquid by weight, solvent out by vacuum
Two loss-in-weight feeders keep the ratio of polymer to reactive liquid constant. What is not grafted, and the acetone, has to leave before the die.
- One loss-in-weight feeder for the polymer.
- MAH and DCP dissolved in acetone and mixed by an agitator; a second loss-in-weight feeder doses the mixed liquid.
- A good vacuum system for degassing.
- Water cooling strand pelletizing.
Where grafted PP and PE go
Grafted polyolefin is an ingredient in other compounds. These are the jobs it does.
| Role | In compounds of |
|---|---|
| Coupling agentbonds filler to PP | PP with glass fibre, carbon fibre or wood fibre; PP with mineral powder |
| Compatibilizerjoins two polymers | PP/PA6, ABS/PA6, PA/EPDM alloys |
SolutionEngineering plastic SolutionWPC wood plastic composites SolutionFiller masterbatch
Strand or underwater
The grafting lines described here use water-cooled strands. Our underwater pelletizing systems have also run MAH-grafted PP and PE for compatibilizer producers.
As specified for grafting
Strands cooled in a water bath and cut by a strand pelletizer.
Enclosed cutting at the die face
The enclosed process helps manage dust and strand breakage in highly modified compounds.
Get a quote
Tell us the base polymer and its melt flow, the MAH and peroxide levels you work with, the end use of the grafted product and the output you need. We will propose the liquid dosing, degassing and pelletizing.
- 01Polymer, MAH & peroxide
- 02Liquid dosing & degassing
- 03Strand or underwater
Souder Chen
Head of Compounding Division
With USEON since 2008. Twin screw compounding, devolatilization and recycling lines.