Halogen Free Flame Retardant Agents for Polypropylene in Wire Coating Process

Abstract

Summary: the processing behaviour and physical properties of polypropylene/flame retardant blends were investigated in order to evaluate their use in the wire-coating process. In particular, the need of flame retardancy, suitable melt processability and good mechanical properties of blends was taken into account. Three types of halogen free flame retardants were chosen and were melt blended to the polypropylene matrix. Blends properties were analysed by rheological, mechanical, and thermal characterization including flame retardancy tests. The wire coating process was also performed by a laboratory wire coating apparatus. The results demonstrated that some of the blends are suitable for the purpose of flame retardancy of electrical household wires as an alternative to PVC

An investigation into synergistic effects of rare earth oxides on intumescent flame retardancy of polypropylene/poly (octylene‐co‐ethylene) blends

“…But high density, poor mechanical properties, and difficult processability of the filled polyolefin is hard to avoid since high loading (about 60 wt%) of metal hydroxides is required to reach UL94 V0 rating 3. Utility of intumescent flame retardant (IFR) in polyolefin is the most promising approach with the objectives of achieving halogen free flame retardancy, lower density, and better processability 3, 4. All intumescent systems generally include three basic ingredients: an acid source, a charring agent and a blowing agent 5, 6.…”

Effect of phytic acid–modified layered double hydroxide on flammability and mechanical properties of intumescent flame retardant polypropylene system

“…Some halogenated flame retardants were no longer used. Thus, researchers have made a lot of efforts to develop eco‐friendly halogen‐free flame retardant additives for polymers …”

“…Thus, researchers have made a lot of efforts to develop eco-friendly halogen-free flame retardant additives for polymers. [1][2][3][4][5] As is well known, ammonium polyphosphate (APP) is a nontoxic, environmentally friendly material, and APP-based systems are very efficient halogen-free flame retardants. A great intumescent of APP forms thick protective layers during combustion, but at the same time, the thick layers are often more easily detached from the substrate, thus becoming less effective.…”

Rheological characterization of polyolefin composites with reduced flammability

“…It causes a need for a higher loading of active matter and thus considerable influences of the composite properties, particularly the flow behaviour. Not many studies have discussed rheological properties of HFFR composites based on polyethylene (PE) 1 , polypropylene (PP) 2 and other polymers 3,4 . The measurements have often been carried out by conventional methods like rotational and capillary rheometries.…”