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简体中文Microencapsulated Ammonium Polyphosphate
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Introduction
Ammonium polyphosphate (APP) is among the most widely used halogen-free flame retardants, acting as the acid source in intumescent systems. Standard APP can be hygroscopic and may migrate or release ammonia under heat and humidity. Microencapsulated ammonium polyphosphate addresses this by coating each APP particle with a thin protective shell.
We start with crystalline phase II APP, which has a long polymer chain and low inherent water solubility, then encapsulate the particles with a resin based shell. The shell further reduces water absorption and solubility, improves thermal stability, and makes the powder easier to blend into polymers and coatings. In a fire, the shell breaks down and the APP core releases phosphoric acid, driving the char formation that protects the substrate.
Microencapsulated grades are typically combined with a carbon source such as pentaerythritol and a blowing agent such as melamine to form a complete intumescent system.
Specification
| Parameter | Typical Value |
|---|---|
| Appearance | White free-flowing powder |
| Chemical Type | Crystalline phase II APP, microencapsulated |
| Phosphorus (P) Content | 28 to 31% |
| Nitrogen (N) Content | 12 to 15% |
| Degree of Polymerization | n greater than 1000 (core) |
| Water Solubility (10% suspension, 25°C) | 0.1 g/100 mL max |
| Particle Size (D50) | 10 to 20 microns |
| Moisture Content | 0.3% max |
| Decomposition Onset | Above 275°C |
| Packaging | 25kg kraft bags with PE liner, 25kg woven bags, or 500kg / 1000kg jumbo bags |
Values are typical and depend on coating type and product code. Technical data sheets and a certificate of analysis are available for every grade.
Application
Microencapsulated APP is used where phosphorus based flame retardancy must be combined with moisture resistance and good compatibility.
- Polypropylene and polyethylene: Intumescent flame-retardant compounds for sheets, profiles, and molded parts.
- Intumescent coatings: Fire-protective paints for steel, wood, and decorative surfaces.
- Epoxy and unsaturated polyester: Laminates, potting compounds, and FRP components.
- Polyurethane systems: Foams, elastomers, and sealants requiring halogen-free protection.
- Cable and wire compounds: EVA and polyolefin based jackets and fillers.
Advantages
- Reduced water sensitivity: The protective shell lowers moisture uptake and water extraction, important in humid or outdoor environments.
- Improved thermal stability: Higher resistance to degradation during compounding, supporting a wider processing window.
- Better polymer compatibility: Coated surfaces blend more easily into polyolefins and resins, with less viscosity increase.
- Low migration: Less surface bloom and leaching over the life of the product.
- Halogen-free: Supports low-smoke, non-corrosive fire performance.
Manufacturing Facility in XUSEN
We have our own production workshops and warehouses, equipped with complete production and quality inspection equipment.
As China Microencapsulated Ammonium Polyphosphate Suppliers and Microencapsulated Ammonium Polyphosphate Factory., With over 20 years in developing halogen-free flame-retardant products positions us as industry leaders in providing domestic flame-retardant solutions.
All our products comply with the stringent requirements of the WEEE, ROHS, and EUP directives.
Rubber and Plastic Industry
Suitable for materials such as PA, PP, polyester, elastomers, PE, EVA, PC, ABS, etc., widely used in household appliances, automobiles, electricians, cables, and other products.
Composite Materials Field
Suitable for composite flame retardant products based on epoxy resin, polyurethane, etc., we can jointly develop flame retardant products with users to meet the requirements of flame retardancy and physical properties.
Adhesive Field
Suitable for oil-based and water-based adhesives, and can be modified according to customer needs to adapt to user usage conditions and requirements, while maintaining good weather resistance and dispersibility.
Fabric coating field
It is applicable to the flame retardant fabric coating based on acrylic lotion. The formula and process can be adjusted according to the user's requirements for flame retardancy, sizing amount, hand feel, etc. to meet the requirements for flame retardancy and physical properties.
Fireproof coatings field
In fireproof coatings, flame retardants are mainly used in APP. We have undergone specific processing techniques for coating APP, which can meet the quality requirements of well-known international manufacturers such as PPG and ICI.
