The future oriented halogen-free, low smoke, high fluidity flame retardant materials, with the core goals of "zero halogen, low smoke toxicity, V-0 level flame retardant, high melt flow, mechanical stability, and full lifecycle environmental protection", have become the technological high ground and market demand of the global polymer materials industry.
Against the backdrop of continued tightening of global regulations such as RoHS/REACH in the European Union, TSCA in the United States, and GB 26572 in China, as well as the explosive demand for safety, environmental protection, and precision molding in new energy vehicles, 5G communications, rail transit, data centers, and high-end electronic appliances, traditional halogen containing flame retardant materials have gradually withdrawn from the high-end market due to the release of toxic and corrosive gases, high smoke levels, and limited environmental protection caused by combustion; However, conventional halogen-free low smoke materials generally suffer from pain points such as poor melt flowability, difficulty in filling thin walls, narrow processing windows, and difficulty balancing mechanics and flame retardancy, making it difficult to adapt to modern manufacturing processes such as precision injection molding, high-speed extrusion, and ultra-thin wall structural components.
-Electronic appliances: 5G base stations, servers Mini-LED、 Ultra thin wall precision components such as fast charging and connectors require high flow, high CTI, low dielectric, and halogen-free V-0;
-New energy vehicles: high-voltage wiring harness, battery pack components, interior, electronic control shell, requiring low smoke, non-toxic, heat-resistant, high impact, and easy molding;
-Rail transit/building/data center: In densely populated scenarios, mandatory requirements include halogen-free, low smoke, low toxicity, and flame retardant Class A, suitable for high-speed extrusion and complex structural forming.
The global annual growth rate of halogen-free flame retardant materials exceeds 12%, with the high fluidity modified category growing by 25%. High end products rely on imports, and there is huge room for localization substitution.
-Halogen free: Total halogen content ≤ 0.5%, no halogen acid gas release during combustion (IEC 60754-1/2, GB/T 32129);
-Flame retardancy: UL94 V-0/5VA, IEC 60332-1/-3, GB/T 2408, bundled flame retardancy Class A;
-Low smoke: smoke density Ds ≤ 150, light transmittance ≥ 60% (IEC 61034, GB/T 17651.2);
-Low toxicity: Combustion toxicity ZA1 level, no HCN or CO exceeding the standard (GB/T 20285);
-Environmental compliance: EU REACH, RoHS 3.0, US UL, China CCC/Green Product Certification.
-Polyolefin system (PP/PE/EVA): High melting point matrix (MFI 20-60) is preferred, suitable for wire harnesses, sheaths, and injection molded parts;
-Engineering plastic system (PA/PC/ABS/PBT): using high flow modified substrates, suitable for electronic precision parts and automotive structural parts;
-Elastic body system (TPE/TPV): oil filling optimization and chain segment regulation, balancing flexibility and fluidity.
Abandoning single high filling ATH/MDH, adopting "inorganic flame retardant+phosphorus nitrogen synergistic+nano smoke suppression" ternary compound:
1. Main flame retardant: Nano scale aluminum hydroxide (ATH)+high decomposition temperature magnesium hydroxide (MDH), ratio 3:1~1:1, surface treated with silane coupling agent to improve dispersibility;
2. Collaborative flame retardant: phosphorus nitrogen based flame retardant (IFR)+zinc borate, reducing inorganic addition by 15-25%, improving carbonization efficiency;
3. Smoke suppression and efficiency enhancement: Nano montmorillonite and iron-based oxides can reduce smoke density by more than 30% without affecting flow.
1. Internal/external lubrication synergy: High molecular weight polyethylene wax and silicone flow aids are added at an amount of 0.3-1.0% to reduce melt viscosity without precipitation;
2. Interface modification of fillers: Nano coating and in-situ grafting improve the compatibility between flame retardants and resins, eliminating high filling "viscosity barriers";
3. Molecular chain optimization: controllable branching and mild degradation, increasing MFI by 2-5 times without losing strength;
4. Precise addition of compatibilizers: maleic anhydride grafted polymer enhances the compatibility of multiphase systems, avoiding delamination and mechanical degradation.
1. Flame retardant test: UL94 vertical combustion, bundle flame retardant, oxygen index, heat release rate;
2. Smoke toxicity testing: smoke density, toxicity index, halogen acid gas, pH value/conductivity;
3. Rheological testing: MFI, melt viscosity, shear rate dependence (to verify high flow);
4. Mechanical testing: tensile, bending, impact, hardness, compression deformation;
5. Weather resistance test: wet heat aging, cold heat cycling, UV aging, long-term high-temperature aging;
6. Environmental testing: halogen content VOC、 Heavy metals and polycyclic aromatic hydrocarbons.
-EU: CE, CPR, REACH, RoHS 3.0;
-North America: UL certification, CSA, TSCA compliance;
-China: CCC, GB/T 32129, Green Product Certification;
-International standards: IEC 60332, IEC 61034, IEC 60754.
1. High voltage wiring harness material for new energy vehicles: halogen-free, low smoke, high flow, oil resistant, temperature resistant to 125 ℃, suitable for high-speed extrusion;
2. Electronic ultra-thin wall injection molded parts: MFI ≥ 30, UL94 V-0 0.8mm, high CTI, low warpage;
3. Rail transit cable sheath: meets TB/T 3237 T1 level, low smoke, non-toxic, flame-retardant A level;
4. Data center cabling materials: comply with UL 1685, Plenum grade, low smoke, low toxicity, and high reliability.
-High liquidity: Shorten molding cycle by 20-40%, suitable for automated production lines;
-Zero halogen, low smoke, zero toxicity: zero corrosion in fire, zero toxic gases, guarding personnel and equipment;
-Environmentally friendly and low-carbon: recyclable throughout the entire lifecycle, reducing carbon footprint by over 20% compared to traditional halogenated materials;
-Wide processing window: adaptable to different equipment and processes, high mass production yield.
Zero halogen, low smoke, high fluidity flame retardant materials are the intersection of three major trends: safety, environmental protection, and manufacturing upgrading. In the future, only enterprises that master the balance technology between high fluidity and zero halogen, low smoke flame retardant, global certification and compliance capabilities, and customized application development capabilities can establish barriers in the global market and become core material suppliers in new energy, electronics, transportation, construction, and other fields.
