Kev siv nplaim-Retardant Formulation rau Thermosetting Acrylic Adhesive
Txhawm rau kom ua tau raws li UL94 V0 nplaim hluav taws kub-retardant yuav tsum tau rau thermosetting acrylic nplaum, xav txog cov yam ntxwv ntawm cov nplaim hluav taws xob uas twb muaj lawm thiab qhov tshwj xeeb ntawm cov tshuab thermosetting, cov qauv hauv qab no optimized thiab tsom xam tseem ceeb yog npaj:
I. Formulation Design Principles & Thermosetting System Requirements
- Yuav tsum sib phim qhov kub thiab txias (feem ntau 120-180 ° C)
- Cov nplaim hluav taws kub hnyiab yuav tsum tiv taus qhov kub thiab txias (tsis txhob decomposition tsis ua hauj lwm)
- Xyuas kom meej dispersion stability nyob rau hauv high crosslink-density systems
- Sib npaug tom qab kho txhua yam muaj zog thiab nplaim retardancy efficiency
II. Synergistic Flame-Retardant System Design
Nplaim Retardant Functions & Thermoset Compatibility
| Nplaim Retardant | Lub luag haujlwm tseem ceeb | Thermoset Compatibility | Pom zoo Loading |
|---|---|---|---|
| Ultra-zoo ATH | Main FR: Endothermic lub cev qhuav dej, roj-theem dilution | Yuav tsum tau hloov kho deg (anti-agglomeration) | ≤35% (kev thauj khoom ntau dhau txo qhov sib txuas) |
| Aluminium hypophosphite | Synergist: Char catalyst, radical scavenger (PO·) | Decomp. temp. > 300 ° C, haum rau kho | 8-12% |
| Zinc borate | Char enhancer: Ua cov iav thaiv, txo cov pa taws | Synergizes nrog ATH (Al-BO char) | 5-8% |
| MCA (Melamine cyanurate) | Gas-theem FR: Tso NH₃, inhibits combustion | Decomp. temp. 250-300 ° C (kho kub. <250 ° C) | 3-5% |
III. Pom zoo Formulation (Qhov hnyav %)
Cov txheej txheem ua cov khoom siv
| Cheebtsam | Piv txwv | Cov Lus Qhia Tseem Ceeb |
|---|---|---|
| Thermoset acrylic resin | 45-50% | Tsawg-viscosity hom (piv txwv li, epoxy acrylate) rau siab muab tub lim |
| Nto hloov ATH (D50 <5µm) | 25-30% | Ua ntej kho nrog KH-550 silane |
| Aluminium hypophosphite | 10-12% | Ua ntej sib xyaw nrog ATH, ntxiv rau hauv cov khoom siv |
| Zinc borate | 6-8% | Ntxiv nrog MCA; zam kev degradation siab |
| MCA | 4-5% | Kev sib xyaw ua ke qis qis qis (<250 ° C) |
| Dispersant (BYK-2152 + PE ciab) | 1.5-2% | Ua kom muaj kev sib xyaw ua kom zoo dispersion |
| Coupling tus neeg sawv cev (KH-550) | 1% | Kev kho ua ntej ntawm ATH / hypophosphite |
| Curing agent (BPO) | 1-2% | Tsawg-temp activator rau kev kho sai |
| Tus neeg sawv cev tiv thaiv (Aerosil R202) | 0.5% | Thixotropic anti-sedimentation |
IV. Cov Txheej Txheem Tseem Ceeb
1. Txheej txheem Dispersion
- Kev kho ua ntej: ATH & hypophosphite soaked hauv 5% KH-550 / ethanol tov (2h, 80 ° C kom qhuav)
- Mixing sequence:
- Resin + dispersant → Low-speed mixing → Ntxiv hloov kho ATH / hypophosphite → High-speed dispersion (2500 rpm, 20 min) → Ntxiv zinc borate / MCA → Tsawg-ceev sib tov (tsis txhob MCA degradation)
- Khoom siv: Planetary tov khoom (nqus degassing) los yog peb-yob zeb (rau ultrafine hmoov)
2. Kev kho kom zoo
- Kauj ruam curing: 80 ° C / 1h (pre-gel) → 140 ° C / 2h (tom qab kho, zam MCA decomposition)
- Kev tswj siab: 0.5-1 MPa los tiv thaiv kev sib tsoo
3. Synergistic Mechanisms
- ATH + Hypophosphite: Forms AlPO₄-reinforced char thaum scavenging radicals (PO·)
- Zinc borate + MCA: Gas-solid dual barrier (NH₃ dilution + molten glassy txheej)
V. Kev ua tau zoo Tuning Strategies
Tej Teeb Meem & Kev daws teeb meem
| Qhov teeb meem | Keeb kwm | Kev daws |
|---|---|---|
| Dripping ignition | Tsawg yaj viscosity | Nce MCA rau 5% + hypophosphite rau 12%, lossis ntxiv 0.5% PTFE micropowder |
| Tom qab kho brittleness | Tshaj ATH loading | Txo ATH rau 25% + 5% nano-CaCO₃ (tawv tawv) |
| Cia sedimentation | Tsis zoo thixotropy | Ntxiv silica rau 0.8% lossis hloov mus rau BYK-410 |
| LOI <28% | Tsis txaus roj-theem FR | Ntxiv 2% coated liab phosphorus los yog 1% nano-BN |
VI. Validation Metrics
- UL94 V0: 3.2 hli kuaj, tag nrho cov nplaim taws lub sij hawm <50 s (tsis muaj paj rwb ignition)
- LOI ≥30% (kev nyab xeeb margin)
- TGA residue > 25% (800 ° C, N₂)
- Mechanical tshuav nyiaj li cas: Tensile zog> 8 MPa, shear zog> 6 MPa
Ntsiab Cai
- Ua tiav V0 qhov ntsuas thaum tswj kev ua haujlwm zoo.
- Kev sim me me (50g) pom zoo ua ntej scaling.
- Rau kev ua tau zoo dua: 2-3% DOPO derivatives (piv txwv li, phosphaphenanthrene) tuaj yeem ntxiv.
Cov qauv no ua kom muaj kev ua raws li cov qauv nruj-tawv nplaim-retardant thaum optimizing processability thiab kev siv kawg.
Lub sij hawm xa tuaj: Plaub Hlis-01-2025
