Diallyl Phthalate (DAP) – CAS 131-17-9

Discover high-purity Diallyl Phthalate (DAP), a versatile crosslinking monomer essential for advanced thermosetting resins and composites. Known for its exceptional thermal stability, electrical insulation, and chemical resistance, DAP is the go-to choice for demanding industrial applications requiring precision and durability.

Product Overview

Diallyl Phthalate, commonly abbreviated as DAP, is a clear, colorless liquid ester derived from phthalic acid and allyl alcohol. It serves as a key reactive diluent and crosslinking agent in the production of unsaturated polyester resins, molding compounds, and laminates. With its ability to polymerize at moderate temperatures, DAP enables the creation of robust materials that maintain structural integrity under extreme conditions.

Key Features:

  • High purity for consistent performance
  • Excellent compatibility with fillers and reinforcements
  • Low volatility for safe handling
  • Rapid curing for efficient manufacturing

Chemical and Physical Properties

DAP’s well-defined properties make it ideal for high-performance formulations. Below is a summary of its core specifications:

Property Value/Description
CAS Number 131-17-9
Molecular Formula C₁₄H₁₄O₄
Molecular Weight 246.26 g/mol
Appearance Clear, colorless liquid
Boiling Point 160°C at 10 mmHg
Flash Point 163°C (closed cup)
Density 1.12 g/cm³ at 20°C
Refractive Index 1.52 at 20°C
Solubility in Water Insoluble (0.182 g/L at 25°C)
Viscosity 7-10 cP at 25°C
Purity ≥98% (GC)

These attributes ensure DAP’s reliability in polymerization processes, contributing to materials with superior mechanical strength and dimensional stability.

Applications

DAP excels in industries where heat resistance, electrical performance, and chemical durability are critical. Common uses include:

  • Electronics and Electrical Components: As a monomer in encapsulants, potting compounds, and insulating varnishes for circuit boards and connectors.
  • Aerospace and Automotive: In high-temperature composites, structural parts, and housings that withstand vibration and thermal stress.
  • Molding and Casting: For thermosetting powders and resins used in precision molded products like switches, relays, and appliance housings.
  • Adhesives and Coatings: Enhancing flexibility and adhesion in UV-curable formulations and protective laminates.
  • Military and Defense: In ruggedized materials for equipment exposed to harsh environments.

By incorporating DAP, manufacturers achieve products with high impact strength, arc resistance, and low water absorption, reducing failure rates in real-world scenarios.

Benefits of Using DAP

  • Thermal Endurance: Maintains integrity up to 200°C, ideal for heat-intensive operations.
  • Electrical Excellence: Provides superior dielectric strength and insulation, minimizing conductivity risks.
  • Chemical Resilience: Resists acids, bases, and solvents, extending service life in corrosive settings.
  • Processing Efficiency: Low shrinkage during curing ensures precise tolerances and reduced post-processing.
  • Eco-Friendly Profile: Low toxicity and minimal environmental impact compared to traditional phthalates.

Whether you’re formulating resins or engineering composites, DAP delivers unmatched performance for innovative, reliable solutions.

Frequently Asked Questions (FAQs)

What is Diallyl Phthalate (DAP) used for?

DAP is primarily used as a crosslinking monomer in thermosetting plastics, polyester resins, and varnishes. It enhances heat resistance, electrical insulation, and mechanical strength in applications like electronics, automotive parts, and aerospace components.

Is DAP safe to handle?

Yes, DAP exhibits low acute toxicity via dermal and inhalation routes. It is non-irritating to skin and eyes at typical concentrations. Always follow standard safety protocols, including ventilation and PPE, during handling and storage.

What is the difference between DAP and other phthalates?

Unlike plasticizing phthalates like DEHP, DAP is a reactive monomer that polymerizes into the final product, providing permanent crosslinking rather than temporary flexibility. This results in more stable, durable materials.

Can DAP be used in food-contact applications?

DAP is not recommended for direct food contact due to its reactive nature. It is best suited for industrial and technical uses where regulatory compliance for non-food applications is met.

How should DAP be stored?

Store in a cool, dry place away from heat, sparks, and oxidizing agents. Keep containers tightly sealed in original packaging to prevent moisture absorption. Shelf life is typically 12-18 months under proper conditions.

What purity levels are available for DAP?

Our DAP is supplied at ≥98% purity (GC method), ensuring high reactivity and minimal impurities for optimal polymerization results.

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