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Pultrusion Resin/
Overview
ALITA 228 Orthophthalic UPR (Pultrusion / High Strength Type)
Category：Pultrusion ResinCode：ALITA 228
Applications
ALITA 228 is an unsaturated polyester resin based on phthalic acid, featuring medium viscosity and medium reactivity.
- Core Features: Exhibits extremely high mechanical strength and excellent toughness.
- Process Suitability: Specifically optimized for pultrusion processes, providing good continuous production stability.
- Typical Applications: Suitable for manufacturing pultruded products requiring strength and durability, such as:
- Tent poles, Gratings
- Door and window profiles, Various pultruded structural parts
Specifications
| Inspection Items | Specification Range | Unit | Test Method |
|---|---|---|---|
| Appearance | Yellow transparent liquid | -- | -- |
| Acid Value | 16 - 24 | mgKOH/g | GB/T 2895-2008 |
| Viscosity (25℃) | 0.65 - 0.7 | Pa·s | GB/T 7193-2008 |
| Solid Content | 65 - 70 | % | GB/T 7193-2008 |
| Thermal Stability (80℃) | ≥ 24 | h | GB/T 7193-2008 |
| Gel Time (25℃) | 4.3 - 6.3 | min | GB/T 7193-2008 |
Gel Time Test Condition: 25℃ constant temperature water bath. Add 0.9g accelerator (1% Co) and 0.9g M-50 (Nouryon) to 50g of resin.
Properties
| Inspection Items | Typical Value | Unit | Test Method |
|---|---|---|---|
| Barcol Hardness | ≥ 42 | -- | GB/T 3854-2005 |
| Heat Distortion Temp (HDT) | 78 | ℃ | GB/T 1634-2004 |
| Elongation at Break | 3.0 | % | GB/T 2567-2008 |
| Tensile Strength | 75 | MPa | GB/T 2567-2008 |
| Tensile Modulus | 3500 | MPa | GB/T 2567-2008 |
| Flexural Strength | 125 | MPa | GB/T 2567-2008 |
| Flexural Modulus | 3800 | MPa | GB/T 2567-2008 |
Experimental Notes:
1. Casting method follows GB/T 8237-2005.
2. Curing system: 0.6% Cobalt Naphthenate 1.0% + Enox BPO-50F 1%.
3. Post-treatment: Room temp 24h + 60℃ 3h + 110℃ 2h.
Usage Instructions
1. Composition: ALITA 228 resin does not contain wax, accelerators, or thixotropic agents.
2. Recommended Pultrusion Formulation: Suggest using BPO curing agent (0.5-2.0%) and TBPB curing agent (0.5-1.5%). The actual selection should be based on specific equipment, product thickness, process temperature, and pultrusion speed.
3. Anti-cracking Measures: When making thick-walled or large-sized products, it is recommended to add low-shrinkage additives to reduce the shrinkage rate.
4. Selection Guidance:
- For higher heat and seawater resistance, ALITA 239 (Isophthalic) is recommended.
- For superior corrosion resistance, ALITA 901 (Epoxy Vinyl Ester) is recommended.
Storage & Handling
- Safety Protection: Wear necessary protective equipment during operation; avoid direct skin and eye contact.
- Environmental Control: Strongly recommended to store below 25℃. Outdoor storage is strictly prohibited; avoid direct sunlight and keep away from heat sources like steam pipes.
- Management: Keep containers sealed to prevent moisture absorption and monomer loss. Regularly rotate stock.