Reference Flame-Retardant Formulation yeThermosetting Acrylic Adhesive
Kuti usangane neUL94 V0 inodzoreredza moto-inodzoreredza zvinodiwa zve thermosetting acrylic adhesives, tichifunga nezve hunhu huripo hwemoto retardants uye iwo chaiwo eiyo thermosetting masisitimu, inotevera optimized kuumbwa uye yakakosha ongororo inokurudzirwa:
I. Magadzirirwo Ekugadzira Mazano & Thermosetting System Zvinodiwa
- Inofanirwa kuenzanisa tembiricha yekurapa (kazhinji 120-180°C)
- Zvidziviriro zvemoto zvinofanirwa kumira zvakanyanya-tembiricha kugadzirisa (kudzivisa kuparara kwekutadza)
- Ita shuwa kupararira kugadzikana mune yakakwira crosslink-density masisitimu
- Balance post-cure mechanical simba uye flame retardancy performance
II. Synergistic Flame-Retardant System Dhizaini
Flame Retardant Mabasa & Thermoset Kuenderana
| Flame Retardant | Primary Basa | Thermoset Kuenderana | Recommended Loading |
|---|---|---|---|
| Yakanyanya kunaka ATH | Main FR: Endothermic dehydration, gasi-phase dilution | Inoda kugadziriswa kwepamusoro (anti-agglomeration) | ≤35% (kuwedzeredza kurodha kunoderedza kuyambuka) |
| Aluminium hypophosphite | Synergist: Char catalyst, radical scavenger (PO·) | Decomp. temp. > 300 ° C, yakakodzera kurapa | 8–12% |
| Zinc borate | Char enhancer: Inoumba girazi inodzivirira, inoderedza utsi | Inopindirana neATH (Al-BO char) | 5–8% |
| MCA (Melamine cyanrate) | Gasi-chikamu FR: Inoburitsa NH₃, inhibits kupisa | Decomp. temp. 250–300°C (kupora tembiricha. <250°C) | 3–5% |
III. Yakakurudzirwa Magadzirirwo (Huremu %)
Component Processing Guidelines
| Chikamu | Ratio | Key Processing Notes |
|---|---|---|
| Thermoset acrylic resin | 45–50% | Yakaderera-viscosity mhando (semuenzaniso, epoxy acrylate) yekurodha yakakwira yekuzadza |
| Nzvimbo-yakagadziridzwa ATH (D50 <5µm) | 25–30% | Pre-yakarapwa neKH-550 silane |
| Aluminium hypophosphite | 10–12% | Pre-yakasanganiswa neATH, yakawedzerwa mumabhechi |
| Zinc borate | 6–8% | Yakawedzerwa neMCA; dzivisa kusvibiswa kwepamusoro-soro |
| MCA | 4–5% | Kunonoka-nhanho yakaderera-kumhanya kusanganisa (<250°C) |
| Dispersant (BYK-2152 + PE wax) | 1.5–2% | Inovimbisa yunifomu yekuzadza kupararira |
| Coupling agent (KH-550) | 1% | Pre-yakarapwa paATH/hypophosphite |
| Kurapa mumiririri (BPO) | 1–2% | Low-temp activator yekukurumidza kurapa |
| Anti-settling agent (Aerosil R202) | 0.5% | Thixotropic anti-sedimentation |
IV. Critical Process Controls
1. Dispersion Process
- Pre-kurapwa: ATH & hypophosphite yakanyikwa mu5% KH-550/ethanol mhinduro (2h, 80°C kuomesa)
- Kusanganisa kutevedzana:
- Resin + dispersant → Yakaderera-kumhanya kusanganisa → Wedzera yakagadziridzwa ATH/hypophosphite → High-speed dispersion (2500 rpm, 20 min) → Wedzera zinc borate/MCA → Low-speed kusanganisa (kudzivisa kukanganisa MCA)
- Zvishandiso: Planetary mixer (vacuum degassing) kana matatu-roll mill (ye ultrafine powders)
2. Kurapa Optimization
- Nhanho yekurapa: 80°C/1h (pre-gel) → 140°C/2h (pashure pekurapa, dzivirira MCA kuora)
- Kudzora kudzvinyirira: 0.5-1 MPa kudzivirira kugadzirisa kwekuzadza
3. Synergistic Mechanisms
- ATH + Hypophosphite: Mafomu AlPO₄-yakasimbiswa char uku uchitsvaira radicals (PO·)
- Zinc borate + MCA: Gas-solid dual barriers (NH₃ dilution + yakanyungudutswa yegirazi layer)
V. Performance Tuning Strategies
Zvakajairwa Nyaya & Mhinduro
| Nyaya | Root Chikonzero | Solution |
|---|---|---|
| Dripping ignition | Low melt viscosity | Wedzera MCA kusvika 5% + hypophosphite kusvika 12%, kana kuwedzera 0.5% PTFE micropowder |
| Mushure mekurapa brittleness | Yakawandisa ATH kurodha | Deredza ATH kusvika 25% + 5% nano-CaCO₃ (inoomesa) |
| Kuchengetedza sedimentation | Murombo thixotropy | Wedzera silica kusvika 0.8% kana chinja kune BYK-410 |
| LOI <28% | Kusakwana gasi-chikamu FR | Wedzera 2% yakavharwa phosphorus tsvuku kana 1% nano-BN |
VI. Validation Metrics
- UL94 V0: 3.2 mm samples, nguva yese yemurazvo <50 s (hapana kubatidza donje)
- LOI ≥30% (safety margin)
- TGA zvakasara >25% (800°C, N₂)
- Mechanical balance: Tensile simba> 8 MPa, shear simba> 6 MPa
Key Takeaways
- Inowana chiyero cheV0 uchichengetedza kutendeseka kwemichina.
- Miyedzo midiki-diki (50g) inokurudzirwa isati yawedzera.
- Nekuita kwepamusoro: 2-3% DOPO derivatives (semuenzaniso, phosphaphenanthrene) inogona kuwedzerwa.
Iyi dhizaini inovimbisa kuteerana neyakaomesesa mirazvo-inodzoreredza mwero uku uchikwenenzvera processability uye kupera-kushandisa kuita.
Nguva yekutumira: Jul-01-2025
