APP-II Flame Retardant

Traditional flame retardants face pain points such as unstable crystal structure, poor water resistance, and insufficient compatibility. The APP-II flame retardant produced by Taixing innovatively adopts the core technology of seed induced transformation and silane melamine composite coating to create orthogonal crystal pure products (XRD verification without impurities), with a phosphorus content of ≥ 31.5% and a nitrogen content of ≥ 14.5%. It constructs a triple synergistic system of "dense carbonization expansion barrier gas-phase flame suppression", and can achieve material UL 94 V-0 flame retardant with only 10% -22% addition, completely solving the industry problems of "moisture absorption migration, carbonization looseness, and performance degradation" of traditional APPs, providing the ultimate performance flame retardant solution for high-end manufacturing industries worldwide.

Core strengths

1. Orthogonal crystal pure product, benchmark for water resistance and stability performance

-Innovative Seed Induced Conversion Process: Using high-purity Type II APP as the seed, the conversion process is precisely controlled in an ammonia atmosphere at 280-300 ℃ to obtain 100% orthogonal crystal products with a crystallinity of up to 99%, smooth and dense surface, and a solubility in water of ≤ 0.4g/100mL at 20 ℃, which is 400% higher than that of Type I APP in terms of water resistance.

-Ultimate weather resistance and migration resistance: After being placed in a humid and hot environment of 85 ℃/85% RH for 2000 hours, there is no moisture absorption or agglomeration, and no migration or precipitation. After soaking in cold and hot water for one week, the flame retardant performance deteriorates by ≤ 3%, making it perfectly suitable for long-term service scenarios such as outdoor high-end building materials and new energy battery packs.

-Wide temperature range thermal stability adaptation: 1% thermal weight loss temperature ≥ 325 ℃, entering the high-efficiency decomposition stage at 400 ℃, processing temperature window covering 200-350 ℃, matched with high temperature processes such as engineering plastic injection molding and high-end coating curing, no toxic gas release, and no impact on product forming quality.

2. Composite coating modification, with excellent compatibility and carbonization properties

-Innovative Silane-KH560/Melamine Composite Coating Technology: Constructing an "Inorganic Silane Reinforcement Layer+Organic Melamine Charcoal Formation Layer" on the surface of APP-II particles, which improves compatibility with organic substrates by 95% and achieves micron level dispersion uniformity, completely solving the problem of product defects caused by traditional APP aggregation.

-Catalytic dense expanded carbon layer: The coating layer works in synergy with APP-II to rapidly dehydrate and carbonize the catalytic substrate, forming a honeycomb shaped dense carbon layer with a thickness 15-25 times that of the original material. The thermal conductivity is ≤ 0.12W/(m · K), and the oxygen thermal barrier efficiency is increased by 70% compared to ordinary APP, effectively suppressing droplet phenomena.

-Controllable loss of mechanical properties: After addition, the retention rate of tensile strength of PP material is ≥ 93%, the retention rate of impact strength of epoxy resin is ≥ 90%, and the elongation at break of modified PP can reach over 240%, without the need for additional dispersants, perfectly balancing flame retardancy and structural strength.

3. Phosphorus nitrogen synergistic efficiency, low addition, environmental protection and safety

-Triple synergistic flame retardant mechanism: release of polyphosphoric acid (acid source) at high temperature to catalyze substrate carbonization; Release ammonia and water vapor (gas source) to dilute combustible gases; The dense expanded carbon layer (carbon source) provides physical barrier, while the decomposition products of melamine quench combustion free radicals, achieving comprehensive protection of "condensed phase+gas phase".

-Low addition amount reduces costs and increases efficiency: Adding 15% to PP material can achieve 1.6mm UL 94 V-0 grade, and the maximum heat release rate (MARHE) is reduced to below 250kW/m ²; Adding 12% to high-end fireproof coatings can achieve a fire resistance limit of 1.8 hours for steel structures, which is 25% -30% less than the amount added to ordinary apps.

-Zero halogen, low smoke, and low toxicity: completely free of harmful substances such as halogens, heavy metals, and PFAS. The smoke density (DS, 4 minutes) during combustion is ≤ 110, and the smoke toxicity reaches the highest safety level of EU EN 13501-1:2024. There is no release of dioxins or hydrogen halides, which is in line with global environmental trends.

Application scenarios

Engineering plastics and electronic and electrical fields

-Application: PP/PE high-end electrical enclosures, PA nylon connectors, epoxy resin PCB substrates, insulation components for new energy battery packs

-Recommended formula: PP substrate 82%+APP-II flame retardant 15%+pentaerythritol (carbon source) 2%+melamine (gas source) 1%

-Advantages: With a thickness of 1.6mm and UL 94 V-0 rating, the dielectric performance is stable (volume resistivity ≥ 10 ¹⁴Ω· cm), and the processing flowability is good. It has passed RoHS 2.0 and REACH full compliance, meeting the large-scale production needs of high-end electronic appliances.

High end fireproof coatings and building materials field

-Application: High end fireproof coating for steel structures, flame-retardant coating for wood, flame-retardant gypsum board, high-end plywood

-Recommended formula: acrylic lotion 62%+flame retardant APP-II 12%+expanded graphite 7%+carbon forming auxiliary 9%+auxiliary 10%

-Advantages: The expanded carbon layer is dense and tough, with a fire resistance limit of over 1.8 hours, excellent resistance to moisture and heat aging, and meets the GB 8624-2012 B1 flame retardant standard. The coating has no odor, no yellowing, and high transparency.

Rubber and new energy field

-Application: EVA cable sheath, polyurethane foam, automobile rubber seal, new energy battery pack flame retardant gasket

-Recommended formula: EVA base material 76%+APP-II flame retardant 19%+compatibilizer 3%+anti-aging agent 2%

-Advantages: Passed the IEC 60332-3 bundle flame retardant test, with a limit oxygen index (LOI) of ≥ 33% and an elastic recovery rate of ≥ 92%. The weather resistance meets long-term outdoor use and is suitable for the needs of new energy and high-end cable fields.

Textile and high-end products field

-Application: Flame retardant cotton fabric, polyester fabric, medical supplies, high-end furniture bonding materials

-Recommended formula: Textile flame retardant finishing solution: APP-II 12%+urea 4%+environmentally friendly adhesive 7%+water 77% (diluted 500 times by immersion rolling)

-Advantages: The textile has a flame retardant time of less than 3 seconds, meets the GB 50222-2017 flame retardant standard, has a soft touch, no "frost" phenomenon, does not contain formaldehyde, and meets the environmental protection requirements of high-end textile and medical products.

If you are looking for APP-II flame retardant, orthogonal crystal APP, high polymerization degree APP-II, Taixing will be your best partner, and we will provide the lowest price to cooperate with you!