Halogen-free polytriazinyl synergists for fire resistance beyond state-of-the-art fire & flame resistance technologies
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1 Halogen-free polytriazinyl synergists for fire resistance beyond state-of-the-art fire & flame resistance technologies Dr. Bansi L. Kaul, EO Technologies GmbH 4105 Biel-Benken, Switzerland It is all about: "hemistry-our life, our future
2 bout us o-sponsors of this conference, and co-exhibitors with Schmidt- hemie; Brochures of our products and services available at the table top exhibition. onducting/supporting R&D & business development in environmentally friendly technologies (benign handprints) and products; Not just in words but in deeds, for example as supported by our novel, proprietary technologies for fire retardants, to be presented today. Bridging gaps between science and technology: aking a new molecule or developing a new technology in a test tube for the sake of curiosity and publicity is not enough. Innovating its real need, creating its market, and finding ways and means of implementing it most economically and ecologically, to create new opportunities and jobs, is the focus of our activities.
3 Fire/Flame Retardants: Problems and opportunities Fire & flame retardants, with almost 2 million tons annual consumption are the largest volume but the least developed and hence the most challenging of all polymer additives: Incredible loadings required compared to any other polymer additive, just to achieve even the bear minimum, are the fundamental cause of most problems, from processing over economy to ultimate environmental issues, now being debated even at governmental levels ( the US Senate) The basic problem of fire safety namely the toxic smoke, smoke density & heat of glow for safe rescue & escape, and fire fighting, have yet to be properly resolved ompatibility/reactivity issues with polymer itself, the permanency of the effect (blooming/durability stability) and the synergism and antagonism with other polymer additives need to be addressed
4 Pointers towards improved fire retardance Plastics are basically <solidified> fossil fuels, hence the need of a common scientific approach, and not individual empirical methodology separately for each polymer and each application, for their fire resistance. We need a better understanding of the mechanisms of fire and flame retardance and aim at universal solutions. This knowledge may even help us develop more efficient combustion fuels. We should forget our prides and prejudices and mind-set, and make joint efforts to resolve the issues by returning back to the basics: inerals, halogen and phosphorous chemistries may not be the only solutions. We also clearly need to focus on fire retardants (FR) rather than flame retardants (FR). Burning tests (UL 94-Flammability) are only an eye-wash. We need to look at the complex whole
5 Definition and differentiation of fire retardants versus flame retardants Fire Retardants (FR) Prevent materials from burning, even before flaming: By quenching of fire; i.e. <Nip the fire in the bud>; They, therefore, prevent the generation of the excessive heat of glow, and suppress formation of toxic smoke (aerosols); <Intumescent systems> Flame Retardants (FR) ct at advanced stage of fire in gas/condense phase by highly exothermic radical reactions, mainly as anti-flaming agents. Hence, usually the problems of high heat glow and smoke density associated with their use; Excessive heat glow generates excessive N-oxides by burning of air, like burning of all fossil fuels, for example in engines/motors /heaters. <Halogen & phosporous based>
6 Typical characteristics of a fire retardant vs. a flame retardant Specific Optical Smoke Density (Ds): Polypropylene; In spite of V0 lassification (1.6 mm) Heat Release Rate [kw/mä]:pe; in spite of V0 lassification (1.6 mm) Flame Retardant (V0) Flame Retardant (V0) 250 DBDPO + antimony trioxide (37 %) 125 Fire Retardant (V0+) PPT 765 (25 %) Fire Retardant (V0+) one alorimeter Heat flux: Orientation: horizontal 50 kw/mä The most essential aspects of rescue, escape (++ classification)
7 Promising of all future FR-Technologies: Intumescent or even ceramic fire shields in the event of fire: Fire retardancy of nature Formation of a spongy char-barrier at the fire point; Extinguishing and preventing the proliferation of fire (with low heat of glow & almost no smoke) < ct both as fire and flame retardants: Nipping the fire in the bud> PP Triazine-Synergism approach, to be presented now, seems to be a viable pathway
8 Universal synergists of FRs and co-synergists Primary FR Effect Polyols Phosphates & Phosphinates N-P--O char formation, acid scavenger Ä PP Triazines Nanoclays /PTFE inerals Low melting or liquids incl. NOR Bromine based N-ineral--O har formation har + ntiplastification har: arbon scavenger for less smoke and heat glow
9 Why Ä PP Triazines as nitrogen-synergists? PP Triazines are particularly recommended where state-of-theart nitrogen synergists, based on melamine and/or its derivatives have limitations due to any or many of the following reasons: Sublimation and mould deposits Blooming (particularly incompatibility in polyolefins) Reactivity: Self-condensation and tridimensional (dendrimer) reactivity towards the monomers (urethanes, epoxides); and even polymers (such as polyesters by amidation; polyamides by cross-amidation and with primary FRs (PP) by Pre intumescent reaction ((in processing); Heat stability Water solubility Hydrolytic & thermal stability/corrosivity (i.e. elamine polyphosphate: being rather a weak acid-base salt, can undergo gradual dissociation in the presence of water in the polar polymer itself).
10 Ä PP Triazines: Suitability for polymers & resins Polyolefins PU/Epoxides É PP Triazines PES/P (particularly GF) P and its blends
11 echanism of polytriazinyl synergism for fire retardance: imicking of nature Fire resistant char barrier formation har swelling Ä PP Triazines Oxygen scavenging/ Selfimmolation Smoke reduction by char formation
12 É PP Triazine HF: Novel, polymeric, halogen-free & chemically mostly inert nitrogen synergist hemical Formula: 126H212N61O11 Exact ass: olecular Weight: Elemental nalysis: ; H, 7.75; ; O, 6.38
13 É Proprietary volatile-organicsolvent-free technology* Suspension polymerisation in the presence of catalysts Examples: PV made by suspension polymerisation PP made using Ziegler-Natta process Patent applications : Polytriazinyl compounds as flame retardants and light stabilizers European Patent application US patent application US 2009/ lso in hina, India, Taiwan, JPN Patent granted in the US (Patent No. 8,202,924) *The handprint of the technology
14 Ä PP Triazines: haracteristics White to off white powders Density: 1.01 (almost same as most of polymers) elting point :> / F; hemically mostly inert: No self-condensation possible Heat stability in polymer itself: / F Insoluble in water and many other solvents; Particle size distribution (measured on powder, with ultrasonic dispersion in a liquid): d 50 < 10 Ñm Need not have relation to dispersion in a polymer
15 Ä PP Triazine HF ; Scanning electron microscopic pictures (x10,000) Individual particle size: < 1 Åm Individual particle shape: Diamond like
16 Ä PP Triazine- Synergism Trends and pointers in various polymers and in combinations with various FRs and co-synergists The Formulations are in no way optimum
17 Ä PP Triazine HF-mmonium polyphosphate combination: PPT 765 (IS=intumescent system) Polypropylene 80% Polypropylene + 20% PPT 765 lmost no burning V-0 & no smoke +, low heat release + Sample t 1 (S) t 2 (s) Dripping/Ignition of otton Time to dripping UL 94 Rating PP 70 - Yes 6 (s) No Rating PP+20% PPT 765 (5% HF) 1 3 No No dripping V-0 (++) Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy
18 SE micrographs and elemental distribution from EDS mapping of the Ä PP Triazine 765 composite (20%) in PP before combustion Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy
19 Ä PP Triazine 765 (IS) : har formation after the fire test PP PP/10 % 765 PP/20 % 765 Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy
20 Thermal stability in PP (TG) Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy Ü Weight (%) % 2 wt.% Sample Temperature ( o ) PP PP/IS (experimetal) PP/IS (calculated) 5% HF (ir atmosphere) 15% T onset (Ö) T max (Ö) * Versus Ö for melamine based intumescent systems, due to the reaction of PP with melamine under processing conditions, thereby confirming the inertness of PP Triazine towards PP Residue at 800 o (%) PP PP/20% 765 (5% HF) 306* (Real) T onset (the temperature at which the sample has lost 5 wt% of its original mass); T max (the temperature at which the maximum rate of mass loss occurs).
21 one calorimeter test: Heat release Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy Heat Rlease Rate (kw/m 2 ) PP PP/10IS PP/20IS 2.5% HF 5% HF Heat release inhibitor Sample Time (s) Peak heat release rate (kwäm -2 ) Peak heat release rate % PP PP/10% 765 (2.5% HF) PP/20% 765 (5% HF)
22 one calorimeter test: Smoke release Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy Smoke release inhibitor Sample SEÜ σ TSR Ü σ (m 2 kg -1 ) (m 2 m -2 ) 4000 PP 638± ±139 Total Smoke Release (m 2 /m 2 ) 2000 PP/10% 765 (2.5% HF) PP/20% 765 (5% HF) 604± Ü ±8 1309±346 (-50%) (-60%) Time (s) SE - the average specific extinction area; TSR - total smoke release.
23 one calorimeter test; Time to ignition: echanism of HF fire retardancy in PP: Self-immolation of HF to protect PP Sample TTI Ü σ (s) pkhrr Ü σ (kwäm -2 ) PP 62Ç9 1221Ü28 PP/10% 765 (2.5% HF) PP/20% 765 (5% HF) 44Ç1 (-30%) 43Ç4 (-30%) 313Ç12 (-75%) 115Ç8 (-90%) TTI- time to ignition; pkhrr- peak heat release rate; Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy
24 Ä PP Triazine HF with ammonium polyphosphate & PTFE/Nanoclay/Pentaerythritol PP (%) PP (P- 422)* (%) PP Triazine HF (%) PTFE (%) 0.1 Nanoclay (%) (loisite Na + ) Pentaerythritol 5 FR (190 g/10 min) N.. N.. N.. N. 5 UL-94 (1/16 ) UL-94 (1/8 ) Burn Burn V-2 V-0 V-0 V-2 V-0 V-0 V-2 V-0 V-0 Oxygen Index
25 Ä PP Triazine HF & a phosphinate combination in glass-filled P 6 Polyamide 6* dditives Glass fibers Exolit OP 1230** Ä PP Triazine HF elamine polyphosphate*** verage burning time(s) UL 94 (1.6 mm) V-0 V-0/V-1 V-1/V-2 n.c. *(Ultramid B3S),** lariant, ***elapur 200 (BSF) Dr. Rudolf Pfaendner Fraunhofer-Institut Darmstadt
26 one calorimeter test: Ä PP Triazine HF & a phosphinate combination in glass-filled P 6 Heat Release Rate (kw/m 2 ) TTI pkhrr Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy Sample 8 Sample 6 Total Heat Release (J/m 2 ) Sample Time (s) TTI Ü σ (s) pkhrr Ü σ (kwàm -2 ) Time (s) THRÜ σ (Jà m -2 ) LR (gàs -1 ) Sample 8 (Exolit OP 1312+HF: %) Sample 6 (Exolit OP 1230+HF: %) 127Ä14 168Ä7 157Ä Ä Ä16 207Ä14 194Ä Ä0.003 TTI- time of ignition; pkhrr- peak heat release rate; THR - total heat release; EH - effective heat of combustion; LR - average mass loss rate.
27 one calorimeter test: Ä PP Triazine HF & a phosphinate combination in glass-filled P 6 Prof. amino ĕt.ăl.: Politecnico di Torino lessandria, Italy Sample Sample 8 (Exolit OP 1312+HF) Sample 6 (Exolit OP 1230+HF) SEÜ σ (m 2 Äkg -1 ) 325Ä50 447Ä47 TSR Ü σ (m 2 Äm -2 ) 1611Ä Ä146 Total Smoke Release (m 2 /m 2 ) Sample 8 Sample 6 SE - the average specific extinction area; TSR - total smoke release Time (s)
28 one calorimeter test: Ä PP Triazine HF & a phosphinate combination in glass-filled P 6 Residue at the end of the combustion test Sample 8
29 Ä PP Triazine HF & TH artinal OL-104 LEO in EV ompound (19% V) for a W& pplication* (* Special courtesy of lbemarle-artinswerk GmbH, Germany) Self-immolation mechanism
30 Self-immolation mechanism of fire and flame retardancy Self-sacrificing moth Self-immolation mechanism of fire and flame retardancy also valid for NOR-hemistry; because increase of the NORconcentration in a polymer increases and not suppresses the flammability
31 Summary Ä PP Triazines: Universal synergist of most fire/flame retardants, and in many polymers. Ä PP Triazines should enable reduce the total loadings of many FR-systems, and therefore, the total cost of fire retardancy & processing, and thereby improve the quality of the plastic items and reduce the ultimate waste for environmental impact Ä PP Triazines should enable achieve halogen-free fire retardancy, at a reasonable cost if and wherever required or desired Ä PP Triazines should enable reduce heat release rate (HRR) & smoke density for better fire safety, particularly if combined with brominated or even halogen-free (phosphorous based) flame retardants associated with this problem. Such properties are perhaps more important than even the flame for fire fighting, and for rescue and escape. Ease of incineration at the disposal stage is an environmental plus.
32 onclusions: It is all about: "hemistry-our life, our future re universal solutions possible? Yes, we can jointly do it! Thank You
33 urrent State of fire and flame retardants for polymers
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