Two-Component Solvent-Free Polyurethane Adhesive for PET/AL/RCPP Retort Pouch with 121C Steam Sterilization
Product Overview
Huitian 866A/866B is a two-component solvent-free polyurethane adhesive developed for flexible packaging lamination. It is recommended for the inner layer of PET/AL/RCPP and PET/AL/NY/RCPP steaming structures. The cured adhesive layer withstands steaming at 121C for 40 minutes and features excellent medium resistance, high bond strength and good inner layer smoothness.
Key Features
- 100% solids solvent-free system with moderate viscosity and excellent wettability
- Withstands retort steaming at 121C for 40 minutes
- High bond strength with good medium (oil, acid, alkali) resistance
- Translucent, elastic and anti-aging adhesive layer after curing
- Does not affect the openability of the inner layer of laminated film
- Meets water boiling and steaming performance requirements
Applications
- PET/AL/RCPP and NY/RCPP lamination structures
- PET/AL/NY/RCPP retort pouch structures
- PET/VMPET/PET/PE high-barrier flexible packaging
- Food and pharmaceutical retort packaging lamination
Typical Technical Parameters
| Parameter | Specification |
|---|---|
| Composition | Isocyanate (866A) / Hydroxyl (866B) |
| Mixing Ratio | 100:80 (w/w), adjustable 100:65-85 by humidity and structure |
| Solid Content | 100% / 100% |
| Viscosity (25C) | 4500-7500 mPa.s (A) / 3500-6500 mPa.s (B) |
| Appearance | Colorless translucent liquid (A) / Yellow translucent liquid (B) |
| Density | 1.17 +/- 0.05 g/cm3 (A) / 1.10 +/- 0.05 g/cm3 (B) |
| Coating Amount | 1.0 - 2.2 g/m2 depending on lamination structure |
| Shelf Life | 9 months (866A) / 12 months (866B) unopened |
| Packing | 20 kg/barrel, 200 kg/drum |
Directions for Use & Precautions
- Mix 866A and 866B at the standard mass ratio of 100:80 in an automatic glue mixer before use.
- Set glue mixing and coating temperatures according to the typical use parameters in the TDS; adjust to actual conditions.
- Films must receive corona treatment to achieve appropriate surface tension before lamination.
- Full process verification is required for outer high-barrier structures such as PET/AL and PET/VMPET.
- Seal containers immediately after opening to avoid moisture absorption and bubble formation.
- Install an effective exhaust hood on the coating system and monitor isocyanate content in the air.
- Store in a cool dry place away from direct sunlight; perform lamination trials before mass production.
FAQ
Q: Can 866A/866B be used for retort pouches?
A: Yes. 866A/866B is specially designed for the inner layer of PET/AL/RCPP and PET/AL/NY/RCPP steaming structures and can withstand steaming at 121C for 40 minutes.
Q: Is 866A/866B a solvent-free adhesive?
A: Yes, both components are 100% solids solvent-free, which eliminates residual solvent risks and meets environmental requirements.
Q: What is the mixing ratio of 866A and 866B?
A: The standard mass ratio is 100:80 (866A:866B). It can be fine-tuned between 100:65 and 100:85 depending on ambient humidity and film lamination structure.
Q: What is the coating amount?
A: The recommended coating amount ranges from 1.0 g/m2 to 2.2 g/m2 depending on the film/foil combination and end use of the laminated film.
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