COMPATIBILISERS | MATERIALS
One alternative is to make the package out of one material (monomaterial PP or PE), but it is a challenge in some cases to achieve the required properties, such as the barrier to oxygen needed to protect the contents. As another alternative, existing, multi-material barrier structures are being tested for recyclability. Adding a compatibiliser additive to the initial compound has been found to allow recyclability of the resulting multilayer films.
Barrier film BASF reported that PE films with both PA and EVOH barrier layers were tested by the independ- ent Institute Cyclos-HTP and found to be compat- ible with recycling. The studies were conducted on coextruded PE/PA6/EVOH high-barrier films and laminated PA6/PE films in household packaging waste. The laminated structures contain a compati- biliser that is added to help distribute the PA component in the PE matrix. In the coextruded structures, the tie layer (used to bond PA and PE) becomes an effective compatibiliser during the recycling process, BASF says. “If additional functionalised polyethylene is also added as a compatibiliser during primary film
production, the polyamide is even recognised as a valuable material in the polyethylene recyclate by Cyclos-HTP,” says Matthias Zorn, Senior Manager Market Development Polyamides for extrusion applications at BASF. “The results show that PE film waste streams containing PA can be processed without significant adjustments to the recycling process. The certifica- tion confirms the standard market practice of PA-containing film waste already being recycled by film manufacturers today,” says Zorn. Dow’s RecycleReady Technology, which contains the company’s Retain compatibiliser, improves recyclability of multilayer films using polar poly- mers, such as EVOH or polyamide, as barrier layers. Dow says that the additive helps reduce gels and improve clarity and mechanical properties. SK Functional Polymer (SKFP) has tested some
of its Lotader terpolymers and Orevac grafted polyolefins as compatibilisers of multilayer PE/ EVOH/PE films. The PE and EVOH layers are usually bonded using a reactive resin, such as a maleic anhydride grafted polyethylene (MAH-g-PE). In recent studies, SKFP evaluated several compatibi- lisers for the blends of PE and EVOH.
�
infls@jwell.cn
sales@jwell.cn
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42
