Dipentaerythritol Hexa

I. Basic Information

• ‌Chemical Name‌: Dipentaerythritol Hexaacrylate (commonly abbreviated as DPHA)

• ‌CAS Number‌: ‌29570-58-9‌

• ‌Molecular Formula‌: ‌C₂₈H₃₄O₁₃‌

• ‌Molecular Weight‌: ‌578.6 g/mol‌

• ‌Synonyms‌: DiPEA, Dipentaerythritol hexaacrylate

• ‌EC Number‌: 249-698-0

II. Physical & Chemical Properties

• ‌Appearance‌: Colorless to pale yellow ‌transparent liquid‌ at room temperature

• ‌Viscosity‌: Relatively low viscosity for a hexafunctional acrylate, facilitating easy processing and formulation

• ‌Solubility‌: Soluble in common organic solvents; limited solubility in water

• ‌Reactivity‌: Contains ‌six acrylate groups‌, enabling high cross-linking density upon UV or visible light exposure

• ‌Curing Speed‌: Rapid curing, forming dense, hard, and durable networks

• ‌Safety‌: May cause skin and eye irritation; proper handling with gloves and ventilation is recommended

III. Production Methods

DPHA is synthesized through the ‌acrylation of dipentaerythritol‌, a polyol with six hydroxyl groups. The process typically involves:

1. Esterification reaction between dipentaerythritol and acrylic acid or its derivatives (e.g., acryloyl chloride).

2. Use of catalysts such as sulfuric acid or p-toluenesulfonic acid to drive the reaction.

3. Purification steps including washing, neutralization, and vacuum distillation to remove unreacted monomers and by-products.

This method ensures high conversion and purity, critical for performance in high-end applications.

IV. Applications

1. ‌UV-Curable Coatings‌:
   Used in automotive, wood, and metal coatings due to fast curing, high hardness, and excellent abrasion resistance.

2. ‌3D Printing Resins‌:
   Serves as a key component in photopolymer resins for high-resolution stereolithography (SLA) and digital light processing (DLP) printing.

3. ‌Electronics Encapsulation‌:
   Provides superior insulation, thermal stability, and environmental protection for sensitive electronic components.

4. ‌Optical Materials‌:
   Applied in lenses, optical adhesives, and fiber coatings due to high transparency and low light scattering.

5. ‌Medical Devices‌:
   Utilized in biocompatible adhesives, dental materials, and drug delivery systems owing to its tunable degradation and compatibility.

6. ‌Adhesives & Sealants‌:
   Enhances bonding strength and durability in structural adhesives for aerospace and automotive industries.

V. Application Cases

• ‌Case 1: High-Performance Automotive Clear Coats‌
  DPHA-based formulations are used in UV-curable clear coats that achieve full cure within seconds, reducing energy consumption and production time while delivering exceptional gloss and scratch resistance.

• ‌Case 2: Precision 3D Printing for Medical Models‌
  In dental and surgical modeling, DPHA enables the production of highly accurate, rigid anatomical replicas with fine detail reproduction, supporting pre-surgical planning.

• ‌Case 3: Encapsulation of LED Chips‌
  DPHA resins protect LED components from moisture and thermal stress, extending device lifespan and maintaining optical efficiency in harsh environments.

• ‌Case 4: Optical Adhesives for Display Assembly‌
  Used in smartphone and tablet displays, DPHA-based adhesives ensure strong bonding with minimal yellowing and high clarity over time.