FLAME RETARDANTS | INNOVATION
Figure 3: Pressure build-up over time of different flame retardant LLDPE/EVA formulations using the DIN EN 13900-5 filter pressure test. This determines the quality of the filler dispersion in the polymer matrix and the influence of mineral fillers on the pressure build-up during compounding and extrusion due to blocked screens. Compound obtained from the twin screw extruder was melted in a single-screw- extruder and conveyed through a 50µm filter. The pressure build-up in front of this filter was measured and evaluated. Source: Nabaltec
pressure build-up during compounding and extrusion while maintaining a good mechanical and aging performance,” it says. Nabaltec has summarised the features of Actilox PA-B2 in a White Paper, which is available on its website. Russian Mining Chemical Company says it
Right: Fire performance of a PA
compounds without Byk-Max CT 4260 (left) and with a 5% addition
sees a growing number of aluminium composite panel (ACP) producers looking to move from B1/ B2 (flame retardant) class panels to A2 (incombusti- ble) class in accordance with EN13501-1. “During the last year we have received several times more requests for EcoPiren (based on Brucite, the mineral form of magnesium hydroxide) suitable for production of A2 core compounds in comparison with the year before. The main ACP products cluster is still rated as B1/B2, which is produced using the conventional extrusion technology,” the company says. “There is still a strong belief that an A2 core compound cannot be produced by extrusion, especially with acceptable density (which is about 1.75g/cm3
). That’s why we dedicate a lot of our
R&D resources to develop new EcoPiren grades and optimise the formulation for A2 class core compound to provide expected level of process- ability and density by extrusion,” it claims. An intermediate result of this work is a new EcoPiren 400-1000 grade for continuous compression lamination. It has already been approved by several
24 COMPOUNDING WORLD | December 2020
www.compoundingworld.com
leading producers of A2 ACP. Quarzwerke’s HPF The Mineral Engineers unit has developed what it says is an innovative flame-retardant material in cooperation with a well-known (but unnamed) automotive supplier and a large compounding company. HPF support- ed the project with various coated and uncoated Kaolin grades, with Kaolin TEC 110 EST showing the best overall performance in the compound. This is a platey phyllosilicate with a high aspect ratio. “With Kaolin TEC 110 we managed to develop a particular high aspect ratio quality with excellent reinforcing properties,” says Péter Sebö, Head of Marketing & Market Development at HPF. Sebö says the olefinic compound developed in the trials shows extremely good flame resistance and good long-term heat stability up to 150 °C. Mechanical properties, such as impact strength, are said to be excellent at temperatures down to -20°C. They were achieved using Kaolin TEC 110 in combination with various halogen-free additives. “In the event of a fire, no corrosive smoke gases are produced and the smoke gas development is hardly measurable,” says Sebö. The compound passed the glow wire test (GWT)
at 750°C according to IEC 60695-2-10/11, with a 1.75mm penetration depth after 30 sec. At 800°C, penetration depth after 30 sec was 2.70mm. It achieves a UL94 V-0 rating and has very good resistance at 23°C and 60°C to various chemicals, including fuels and oils. Flammability tests were run with specimen thicknesses down to 0.8 mm. “We think that a V-0 below 0.8mm is also possible,” says Sebö. The recipe and the precise loading of Kaolin is confidential, but is said to be more than 10%.
Targeting polyamides Last year, Byk launched Byk-Max CT 4260, an organophilic sheet silicate for use in thermoplastics
IMAGE: BYK
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