Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

DuPont™ Entira™ EP compatibilizers support high-value recycling of mixed polymers

12.11.2013
DuPont™ Entira™ EP is a new series of compatibilizers which are formulated for highly efficient recycling of difficult-to-separate mixtures of inherently incompatible polymers.

The first grades which have now become available in the market are ethylene-copolymers, optimized for mixed waste streams of polypropylene (PP) and polyethylene (PE). DuPont is currently developing further formulations of compatibilizers for other mixed materials.


Image: DuPont

A new series of DuPont™ Entira™ EP compatibilizers is designed for the value-adding recycling of difficult to separate mixtures of polymers. First grades have now become available in the market. These are optimized for the converting of PP-PE-mixtures, providing easy-to-process re-granulates with significantly improved low temperature toughness. Specific performance demands can be met by selecting different formulations, used alone or in combination.

These include PE and polyamide (PA) or PE and ethylenvinyl alcohol (EVOH), which are typically used as barrier resins in polyolefin based packaging films, bottles or rigid containers, and therefore available in high quantities worldwide. Another area of interest are PE-PET mixtures with PE as the dominant matrix, arising in the beverage industry. These developments are all together dedicated to rise the efficiency of the plastics recycling industry.

Compounding of reground mixed polymers together with Entira™ EP in an efficiently mixing twin-screw extruder or in a single screw extruder with good mixing performance provides re-granulates in pellet form with excellent mechanical and processing properties, meeting high demands even with high degrees of contamination. The re-compounding process itself is more economical, because using Entira™ EP significantly reduces the need for melt filter cleaning operations.

Depending on the selected compatibilizer formulation, the re-compounded materials can reach almost the same level of low temperature toughness as the major blend fraction. Due to their excellent processing properties, the re-granulates are highly suitable for injection moulding, extrusion or blow-moulding. Typical applications include their use as blending partner in new materials or as core layer surrounded by new product. Under certain conditions they can even be processed directly.

“As plastic processors increasingly recycle plastic waste in-house, the amount of single-component and therefore easy-to-process material available to the recycling industry is going down”, comments Michel Decodts, Market Segment Leader at DuPont. “At the same time, incompatible plastic mixtures have become more readily available. These have to be segregated at relatively high cost and therefore make it more difficult to achieve specified recycling rates. Entira™ EP compatibilizers now offer manufacturers of re-compounds cost-efficient new opportunities, as they significantly boost the range of ready-to-use raw materials for high-performance applications.”

Typical sources for mixed PP-PE waste streams include packaging applications, such as screw-caps made of PP and fitted with sealing inserts made of foamed PE. Products resulting from mixing and jointly processing such incompatible plastics in an extruder will always consist of a continuous phase (the matrix), created by the higher fraction material, and inclusions of the other component dispersed in this matrix. Adhesion between the matrix and the inclusions is poor, cracks may easily propagate along their interfaces, and mechanical properties are therefore on a very low level.

The new PE-PP-specific Entira™ EP formulations are ethylene-copolymers, exhibiting high compatibility – and hence adhesion – to either one or to both polyolefins. Even at low concentrations of around 4%, these new compatibilizers act highly efficient, promoting a firm bond between matrix and dispersed material. Best results will derive from an advanced formulation which provides good compatibility to PE and at the same time to PP. Here cracks will propagate through both the PE and the PP rather than along their interfaces, increasing strength, elongation at break, and in particular low temperature impact strength of the re-compounded materials to a level which even meets most stringent requirements.

Loic Rolland, Technical Development Leader at DuPont Packaging & Industrial Polymers, adds: “Entira™ EP compatibilizers provide new opportunities for generating added value by recycling used plastics, and help reducing the need for landfilling or incineration. They support the production of re-compounds with excellent processing and in-use performance even from highly contaminated feedstock. Our tests have shown mechanical properties to reach levels, which can normally be achieved only after applying costly separation technologies to provide extra low contamination grades. Therefore, re-granulates compounded with Entira™ EP are even suitable to mould high-performance, thin-walled components.”

DuPont Packaging & Industrial Polymers manufactures an extensive mix of adhesive, barrier, peelable lidding, coupling agents, compatibilizers, and sealant resins and provides a globally networked development team to work with customers on packaging programs that help protect the product, environment; improve shelf appeal, convenience; and reduce cost in the food, cosmetics, medical products and other consumer goods and industrial packaging industries.

DuPont (NYSE: DD) has been bringing world-class science and engineering to the global marketplace in the form of innovative products, materials, and services since 1802. The company believes that by collaborating with customers, governments, NGOs, and thought leaders we can help find solutions to such global challenges as providing enough healthy food for people everywhere, decreasing dependence on fossil fuels, and protecting life and the environment. For additional information about DuPont and its commitment to inclusive innovation, please visit (www.dupont.com).

XXX

The DuPont Oval, DuPont™ and all products denoted with ® are registered trademarks or trademarks of E. I. du Pont de Nemours and Company or its affiliates.

PIP-K-2013-02

Contact:
DuPont
Birgit Radlinger
Birgit.Radlinger@dupont.com

Birgit Radlinger | DuPont
Further information:
http://www.dupont.com

More articles from Materials Sciences:

nachricht One in 5 materials chemistry papers may be wrong, study suggests
15.12.2017 | Georgia Institute of Technology

nachricht Scientists channel graphene to understand filtration and ion transport into cells
11.12.2017 | National Institute of Standards and Technology (NIST)

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First-of-its-kind chemical oscillator offers new level of molecular control

DNA molecules that follow specific instructions could offer more precise molecular control of synthetic chemical systems, a discovery that opens the door for engineers to create molecular machines with new and complex behaviors.

Researchers have created chemical amplifiers and a chemical oscillator using a systematic method that has the potential to embed sophisticated circuit...

Im Focus: Long-lived storage of a photonic qubit for worldwide teleportation

MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.

Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...

Im Focus: Electromagnetic water cloak eliminates drag and wake

Detailed calculations show water cloaks are feasible with today's technology

Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...

Im Focus: Scientists channel graphene to understand filtration and ion transport into cells

Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.

To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...

Im Focus: Towards data storage at the single molecule level

The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.

Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

AKL’18: The opportunities and challenges of digitalization in the laser industry

07.12.2017 | Event News

 
Latest News

Engineers program tiny robots to move, think like insects

15.12.2017 | Power and Electrical Engineering

One in 5 materials chemistry papers may be wrong, study suggests

15.12.2017 | Materials Sciences

New antbird species discovered in Peru by LSU ornithologists

15.12.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>