For R&D scientists and product formulators in the chemical and materials industries, understanding the technical nuances of key additives is crucial for innovation and problem-solving. DPO-HQ (CAS 13291-46-8) is a prime example of such a critical component – a high-purity reactive organic phosphorus flame retardant designed for demanding applications. This article explores the technical profile of DPO-HQ and its role in enhancing polymer performance, with an emphasis on sourcing from reliable manufacturers.

Chemical Identity and Structure of DPO-HQ

DPO-HQ, also known by its chemical name 2-(diphenylphosphinyl)-1,4-benzenediol, is a complex organic molecule featuring a phosphorus atom central to its flame-retardant efficacy. Its structure facilitates its integration into polymer chains, making it a reactive flame retardant. This means it doesn’t just sit passively within the polymer matrix; it actively participates in the polymerization or cross-linking process.

Key technical specifications include:

  • CAS Number: 13291-46-8
  • Molecular Formula: C18H15O3P
  • Molecular Weight: 310.28
  • Appearance: White Powder
  • Purity (HPLC): ≥98.0%
  • Drying Loss: ≤0.20%

The high purity is paramount for predictable performance in sophisticated applications. The low drying loss indicates good thermal stability and minimal moisture content, both vital for precise formulation and consistent results.

Mechanism of Flame Retardancy

As a phosphorus-based flame retardant, DPO-HQ functions through multiple pathways. During combustion:

  1. Char Formation: The phosphorus component promotes the formation of a carbonaceous char layer on the surface of the burning polymer. This layer acts as a physical barrier, insulating the underlying material from heat and oxygen, and preventing the release of flammable gases.
  2. Gas Phase Inhibition: Phosphorus species can also enter the gas phase, where they act as radical scavengers, disrupting the exothermic chain reactions that sustain the flame.

This dual action makes phosphorus flame retardants highly efficient, and reactive types like DPO-HQ offer the added benefit of enhanced durability. When you buy DPO-HQ, you are obtaining a technologically advanced solution for fire safety.

Application in Epoxy Resins and Beyond

DPO-HQ finds extensive use in epoxy resin systems, particularly for applications requiring excellent thermal and electrical properties coupled with fire resistance. This includes:

  • Electronic Materials: High-performance printed circuit boards (PCBs) and electronic encapsulants benefit from the flame retardancy and electrical insulation properties imparted by DPO-HQ.
  • Advanced Composites: In aerospace and automotive sectors, where lightweight yet robust materials are needed, DPO-HQ can improve the fire safety of composite structures.

The ability to be incorporated directly into the polymer backbone means that the flame-retardant properties remain intact even under harsh processing conditions or during the product’s service life.

Reliable Sourcing of DPO-HQ

For R&D teams and manufacturers, securing a consistent supply of high-purity DPO-HQ is essential. Partnering with established chemical suppliers, particularly those based in China with strong manufacturing capabilities, ensures access to this critical material. A trusted phosphorus flame retardant supplier will provide detailed technical data sheets, COAs, and responsive support, facilitating seamless integration into your product development cycles.

In summary, DPO-HQ represents a sophisticated solution for modern flame retardancy needs. Its technical properties, particularly its reactive nature and high purity, make it an invaluable component for advanced polymer applications. Engaging with a competent China manufacturer for your DPO-HQ procurement needs ensures both quality and supply chain stability.