ADDITIVES | RECYCLING
achieved upon activation of these metallocenes with methylaluminoxane (MAO). The MAO serves two roles. Firstly, alkylation of the metallocene halide and secondly abstraction of an anionic ligand (chloride or methyl) to give an electrophilic catalyst with a labile coordination site.” Ziegler–Natta catalysts have been used in the
commercial manufacture of various polyolefins since 1956. Monte says Kenrich uses a neoalkoxy titanate (titanium IV neoalkoxy, tris dioctyl phospha- to-O) in combination with Al2
SIO5 mixed metal
Right: ZeMac Link NP, from Vertellus, allows effective production of polyamide/ polyester blends and alloys
catalyst in powder and pellet forms for in situ macromolecular repolymerisation and copolymeri- sation in the melt – polymer compatibilisation. In addition, the neoalkoxy titanate proton coordinates with inorganic fillers and organic particulates to couple/compatibilise the dissimilar interfaces at the nano-atomic level reducing the need for sorting. Monte believes that future developments will include the use of recycled plastic compounds and rubber as functional fillers in concrete and asphalt compositions. A recent study [Appl. Sci. 2018, 8, 1029; doi:10.3390/ app8071029] looked at the effects of titanate coupling agents on the engineering properties of asphalt binders and mixtures incorporating LLDPE-CaCO3
pellets to overcome the
problem of asphalt rutting. The research- ers concluded that the coupling agent was used to enhance the crosslinking between materials by means of winding up covalent bonds or mol- ecule chains, improving the perfor- mance of the composites. The addition of modifiers and coupling agent significantly im- proved the resistance to permanent deformation of asphalt binders.
Upgrading polyesters Vertellus recently introduced ZeMac Extend P, a chain extender additive that facilitates upgrading of recycled polyesters such as PET for use in a variety of target applications. The company says that ZeMac Extend P increases molecular weight and intrinsic viscosity of both recycled and virgin PET. Delivering improved melt viscosity and increasing melt strength, it is claimed to reduce sagging of the extrudate, resulting in faster production. It also counteracts hydrolytic degrada- tion and improves impact strength. From a performance perspective, the company
says ZeMac Extend P can be used in a broad range of target applications and delivers performance
62 COMPOUNDING WORLD | September 2018
close to that achieved using 100% virgin materials. Examples of suitable applications include staple and filament fibres; injection moulding; film, sheet, tape and profile extrusion; bottle blow moulding; and strapping and foamed sheets. ZeMac Extend P also supports sustainability
efforts, enabling low cost post-industrial and post-consumer recycled PET to be utilised, as well as incorporating glass fibre, minerals and impact modifiers. “As varied industries seek technologies to improve material performance and support sustain- able production processes, ZeMac Extend P offers an innovative solution for improving intrinsic viscosity and impact strength while supporting efficient production,” says Prasad Taranekar, Marketing Manager at Vertellus. The company has also developed new additive technology that allows compounders and moulders to reduce costs and boost sustainability efforts while integrating previously incompat- ible materials into their alloys. ZeMac Link NP is a compatibi- liser additive that permits the inclusion of polyamide and polyester materials – including
recycled and post-consumer polyethyl- ene terephthalate (r-PET) – in the alloy production process. Effective at very low levels, ZeMac Link NP is claimed to provide a cost-effective approach for combining virgin nylon and r-PET materials. Vertellus says ZeMac Link NP is well suited for use in a range of alloy applications including
office furniture, fasteners, hand tools, outdoor equipment, textile bobbins and automotive accessories such as hubcaps. ZeMac Link NP allows lower cost post-industrial and post-consumer polyesters to be included in alloy compounds, supporting sustainability initiatives. Glass fibre, minerals and impact modifiers may also be used with ZeMac Link NP. The company says that as compounders and moulders seek to cost-effectively improve material performance while boosting sustainable produc- tion processes, ZeMac Link NP provides an innovative and cost-effective solution for including recycled nylon and r-PET materials with virgin nylon in various alloys.
CLICK ON THE LINKS FOR MORE INFORMATION: �
www.4struktol.com �
www.nexamchemical.com �
www.4kenrich.com �
www.vertellus.com
www.compoundingworld.com
V
E
R
T
E
L
L
S U
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 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82
