Hydroxypropyl Acrylate (HPA)
Hydroxypropyl Aacrylate, also known as 2-Hydroxypropyl Acrylate, is a versatile, hydrophilic acrylate monomer featuring a hydroxypropyl functional group. This clear, colorless liquid serves as a key building block in polymer formulations, enabling enhanced performance in adhesives, coatings, and specialty resins. With its dual reactivity—through the acrylate double bond and hydroxyl group—HPA excels in applications requiring flexibility, adhesion, and moisture resistance. Produced to high purity standards, HPA is essential for industries seeking durable, high-performance materials.
Key Features and Benefits
- Superior Adhesion: The hydroxyl group promotes strong bonding to various substrates, including metals, plastics, and wood.
- Enhanced Flexibility: Improves elasticity in cured polymers, reducing brittleness in flexible coatings and sealants.
- Chemical Resistance: Contributes to robust formulations that withstand exposure to solvents, acids, and environmental stressors.
- Crosslinking Capability: Facilitates UV-curable systems, enabling rapid polymerization for efficient manufacturing processes.
- Moisture Sensitivity: Hydrophilic nature supports water-based emulsions, ideal for eco-friendly formulations.
HPA’s low volatility and high reactivity make it a preferred choice over traditional acrylates, offering up to 20-30% improved scratch resistance in final products based on polymer testing data.
Applications-Hydroxypropyl Acrylate (HPA)
Hydroxypropyl Acrylate is widely utilized across diverse sectors:
- Adhesives and Sealants: Enhances tack and durability in pressure-sensitive and structural adhesives.
- Coatings: Provides gloss, flexibility, and weather resistance in wood, automotive, and industrial finishes.
- Textiles and Nonwovens: Improves hydrophilicity and binding in fabric treatments and hygiene products.
- Personal Care: Acts as a thickener and stabilizer in gels, lotions, and hair care formulations.
- Electronics: Supports conformal coatings for circuit boards, offering insulation and flexibility.
In polymer synthesis, HPA copolymerizes readily with acrylics, methacrylates, and vinyl monomers, yielding products with tailored mechanical properties.
Technical Specifications-Hydroxypropyl Acrylate (HPA)
| Property | Value/Description |
|---|---|
| CAS Number | 25584-83-2 |
| Molecular Formula | C₆H₁₀O₃ |
| Molecular Weight | 130.14 g/mol |
| Appearance | Clear, colorless liquid |
| Purity | ≥98% (GC) |
| Density | 1.05 g/cm³ at 20°C |
| Flash Point | 97°C (207°F) |
| Boiling Point | 200-210°C at 760 mmHg |
| Refractive Index | 1.435-1.445 at 20°C |
| Viscosity | 5-10 mPa·s at 25°C |
| Solubility | Soluble in water, alcohols, and most organic solvents |
Note: Specifications may vary slightly by batch; contact us for a Certificate of Analysis (COA).
Safety and Handling
HPA is classified as a hazardous material due to its potential for skin and eye irritation, as well as exothermic polymerization if exposed to heat, contaminants, or initiators. Key precautions include:
- Use in well-ventilated areas with appropriate PPE (gloves, goggles, respirators).
- Store under nitrogen blanket in cool, dry conditions (below 25°C) to prevent polymerization.
- In case of contact, rinse immediately with water; seek medical attention for ingestion or inhalation.
- For detailed guidance, refer to the Safety Data Sheet (SDS) available upon request.
Environmental impact is minimized through its biodegradability in aqueous systems, with low aquatic toxicity (LC50 >3 mg/L for fathead minnows).
Frequently Asked Questions (FAQs)-Hydroxypropyl Acrylate (HPA)
What is Hydroxypropyl Acrylate used for?
Hydroxypropyl Acrylate (HPA) is primarily used as a reactive diluent and functional monomer in the production of acrylic polymers, adhesives, coatings, and personal care products. It imparts adhesion, flexibility, and chemical resistance to end-use materials.
Is Hydroxypropyl Acrylate safe to handle?
HPA requires careful handling due to its irritant properties and potential for polymerization. It is harmful if swallowed or absorbed through the skin and can cause respiratory irritation via inhalation. Always follow SDS guidelines and use protective equipment.
What are the storage requirements for HPA?
Store HPA in tightly sealed containers in a cool, dark place under an inert atmosphere (e.g., nitrogen) to avoid polymerization. Recommended temperature: 5-25°C. Shelf life is typically 6-12 months when properly stored.
Can Hydroxypropyl Acrylate be used in water-based formulations?
Yes, its hydrophilic hydroxypropyl group makes HPA highly compatible with water-based systems, such as emulsions and latexes, supporting the development of low-VOC, eco-friendly products.
How does HPA differ from Hydroxyethyl Acrylate (HEA)?
While both are hydroxy-functional acrylates, HPA offers a longer alkyl chain for improved flexibility and moisture resistance, making it better suited for flexible coatings and textiles compared to the more rigid HEA.
What is the typical dosage of HPA in formulations?
Dosage varies by application but ranges from 5-30% by weight in copolymers. For UV-curable coatings, 10-20% is common to balance reactivity and viscosity.
Does HPA comply with regulatory standards?
HPA meets REACH, TSCA, and other global chemical regulations for industrial use. It is not intended for direct food contact but is suitable for indirect applications in compliant products.
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Core Product Lineup
| Product Name | Abbreviation | CAS Number | Key Properties & Uses |
| Methacrylic Acid | MAA | 79-41-4 | Reactive monomer for acrylic resins; enhances hardness and chemical resistance in paints, adhesives, and textiles. |
| Methyl Methacrylate | MMA | 80-62-6 | Clear liquid for PMMA (Plexiglas®-like sheets); ideal for optical lenses, signage, and injection-molded parts with high impact strength. |
| Hydroxyethyl Methacrylate | HEMA | 868-77-9 | Hydrophilic monomer for hydrogels; excels in contact lenses, dental composites, and drug delivery systems for biocompatibility and flexibility. |
| Hydroxypropyl Methacrylate | HPMA | 27813-02-1 | Flexible hydroxy monomer; boosts moisture resistance in coatings, nail polishes, and flexible adhesives. |
| Hydroxyethyl Acrylate | HEA | 818-61-1 | Fast-reacting acrylate; used in waterborne emulsions for textiles, paper coatings, and pressure-sensitive adhesives. |
| Hydroxypropyl Acrylate | HPA | 25584-83-2 | Dual-functional for UV-curable systems; enhances adhesion and elasticity in sealants, wood finishes, and personal care thickeners. |
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