Monoxazolidine Moisture Scavenger & Bisoxazolidine Latent Hardener FMOXA-001 / FMOXA-002 for Polyurethane Systems
Product Summary
Moisture-Triggered Chemical Scavenging & Bubble-Free Crosslinking for Superior Polyurethane Coating QualityIndependently developed by Shanghai Feimi Materials Technology Co., Ltd., FMOXA-001 (Monoxazolidine Moisture Scavenger) and FMOXA-002 (Bisoxazolidine Latent Curing Agent) are high-performance specialty additives designed to solve side-reaction issues caused by trace moisture and isocyanate (-NCO) groups generating carbon dioxide (CO2) gas in Polyurethane (PU) systems.During the application of 1K/2K PU coatings, industrial flooring, adhesives, sealants, and waterproofing membranes (such as roof and balcony coatings), ambient moisture or moisture introduced by raw materials frequently leads to severe film defects like pinholes, blistering, and delamination, while severely limiting single-pass thickness (high-build capability).Feimi’s oxazolidine portfolio utilizes a unique moisture-triggered chemical mechanism:FMOXA-001 efficiently scavenges system moisture without gas evolution, ensuring clear aliphatic coatings remain non-yellowing and defect-free.FMOXA-002 acts as a bifunctional latent hardener that hydrolyzes upon exposure to atmospheric moisture to generate reactive amine and hydroxyl groups. This accelerates the curing of low-NCO prepolymers, achieving high-strength, bubble-free deep-cure in thick-film applications.Featuring low initial viscosity, excellent compatibility, and superior storage stability, the FMOXA series is the ideal choice for formulating eco-friendly, high-solids, low-VOC polyurethane products.
Oxazolidine Moisture-Scavenging & Curing Mechanism
Product Advantages
- High-Efficiency Chemical Scavenging (Eliminates High-Build Blistering)Reacts quantitatively with trace water to eliminate CO2 gas evolution caused by NCO + H2O side reactions, completely preventing surface pinholes and internal micro-bubbles in thick coatings.
- Low Color & Low Viscosity (Ideal for Aliphatic Clear Coats)FMOXA-001 offers extremely low initial viscosity and exceptional color stability (APHA<=250), ensuring easy incorporation and long-term non-yellowing performance under UV exposure.
- Moisture-Triggered Latent Crosslinking (Accelerates 1K PU Curing)Remains inert in sealed packaging. Upon application, FMOXA-002 hydrolyzes with atmospheric humidity to release active amine and hydroxyl groups, significantly speeding up tack-free and full-cure times for 1K PU sealants and coatings.
- Enables Single-Pass High-Build Application (Boosts Mechanical Strength)Breaks through traditional limits of single-pass spray/trowel thickness. Achieves high crosslinking density, tensile strength, and crack resistance in high-solids formulations.
- Superior Package Storage Stability & Eco-Friendly DesignScavenges residual moisture from pigments and resins, significantly extending shelf-life in sealed containers. Fully supports high-solids, low-VOC sustainable product design.
FMOXA-001 Typical properties
| 检验/性能项目 | 技术指标 |
|---|
| 产品型号Products | FMOXA-001 |
| 外观Apperance | 无色或者淡黄色液体 |
| 密度（g/cm³）Density | 0.87 ~ 0.92 |
| 有效成分含量Purity | ≥ 97% |
| 粘度Viscosity（20℃，mPa.s） | 10 ~ 20 |
| 推荐用量 Recommended use level | 0.5 ~ 5% |
| 官能度Functional group | 3 |
FMOXA-002 Typical properties
| 检验/技术指标 | 典型值 |
|---|
| 产品型号Products | FMOXA-002 |
| 外观Apperance | 淡黄色液体 |
| 密度Density（g/cm³） | 1.03 ~ 1.09 |
| 有效成分含量Purity | ≥ 97% |
| 粘度Viscosity（20℃，mPa.s） | 25000 ~ 35000 |
| 当量Equivalent Weight（g/mol，和 NCO 反应） | 123 |
| 官能度Functional group | 4 |
Product Applications
- Industrial & Protective Coatings: High-solids, low-VOC protective coatings for heavy machinery and steel structures, delivering defect-free, thick-film protection.
- Polyurethane Flooring: Industrial workshops, cleanrooms, and commercial floorings, preventing bubbling and cracking caused by high ambient humidity during application.
- Adhesives & Sealants: One-component (1K) moisture-cure PU construction sealants and automotive structural adhesives, significantly shortening deep-section curing time.
- Waterproofing Membranes: Seamless liquid waterproofing systems for roofs, balconies, and bridge decks, achieving bubble-free, high-build membrane performance.
Handling
- Please refer to the Safety Data Sheet (SDS / MSDS) prior to use.
- Shelf Life & Storage
- 12 months from the manufacturing date when stored unopened in original containers in a cool, dry, and dark environment. Avoid prolonged exposure to ambient air and moisture.
FAQ
- Q1: What is the fundamental difference between Monoxazolidine FMOXA-001 and Bisoxazolidine FMOXA-002 in Polyurethane systems?A: FMOXA-001 is primarily a moisture scavenger / water absorber. Containing a single oxazolidine ring, it consumes residual water in raw materials or ambient humidity to prevent CO2gassing and blistering. FMOXA-002 features two oxazolidine rings. Upon hydrolysis, it releases multiple reactive sites that crosslink with isocyanate (-NCO) groups. It serves as a latent curing agent, enhancing both curing speed and overall mechanical strength alongside gas elimination.
- Q2: Does adding FMOXA-001 or FMOXA-002 affect the shelf-life and storage stability of 1K PU formulations?A: No. As long as packaging remains sealed against atmospheric moisture, FMOXA series products exhibit high chemical stability and will not react prematurely with isocyanates. In fact, by scavenging trace moisture introduced during liquid mixing and compounding, FMOXA significantly extends the package shelf-life of 1K PU products.
- Q3: Can Shanghai Feimi Materials provide customized oxazolidine formulations for specific viscosity or reactivity requirements?A: Yes. Feimi operates an advanced R&D synthesis laboratory. We provide tailor-made modifications, compatibility testing, and custom derivative development tailored to your prepolymer $-NCO$ content, ambient application conditions, and target tack-free/full-cure times.
