Halogen-Free Flame Retardant Formulation for TPU Txheej System Siv DMF Solvent
Rau TPU txheej txheej siv Dimethyl Formamide (DMF) ua cov kuab tshuaj, kev siv aluminium hypophosphite (AHP) thiab zinc borate (ZB) raws li cov nplaim hluav taws kub hnyiab yuav tsum muaj kev soj ntsuam zoo. Hauv qab no yog cov ncauj lus kom ntxaws tsom xam thiab kev npaj ua tiav:
I. Kev Ntsuas Kev Ntsuas ntawm Aluminium Hypophosphite (AHP)
1. Nplaim Retardant Mechanism thiab qhov zoo
- Mechanism:
- Decomposes ntawm qhov kub thiab txias los tsim phosphoric thiab metaphosphoric acids, txhawb char tsim nyob rau hauv TPU (condensed-theem nplaim retardancy).
- Tso PO· radicals los cuam tshuam cov kab hluav taws xob sib txuas (gas-phase flame retardancy).
- Qhov zoo:
- Halogen-dawb, tsis muaj pa luam yeeb, tsis muaj tshuaj lom, ua raws RoHS / REACH.
- Zoo thermal stability (decomposition kub ≈300 ° C), haum rau TPU qhuav txheej txheem (feem ntau <150 ° C).
2. Daim Ntawv Thov Kev Sib Tw thiab Kev daws teeb meem
| Kev sib tw | Kev daws |
| Tsis zoo dispersion hauv DMF | Siv qhov chaw hloov kho AHP (piv txwv li, silane coupling agent KH-550). Pre-dispersion txheej txheem: Pob-mill AHP nrog DMF thiab dispersant (xws li, BYK-110) rau particle loj <5μm. |
| Siab loading yuav tsum tau (20-30%) | Synergistic ua ke nrog ZB los yog melamine cyanurate (MCA) kom txo tau tag nrho cov loading rau 15-20%. |
| Txo cov txheej txheej pob tshab | Siv nano-loj AHP (particle loj <1μm) los yog sib tov nrog pob tshab nplaim retardants (xws li, organic phosphates). |
3. Pom zoo tsim thiab txheej txheem
- Piv txwv Formulation:
- TPU / DMF puag: 100 phr
- Surface-modified AHP: 20 phr
- Zinc borate (ZB): 5 phr (kev haus luam yeeb sib koom ua ke)
- Dispersant (BYK-110): 1.5 phr
- Txheej Txheem Ntsiab Lus:
- Pre-mix AHP nrog dispersant thiab ib nrab DMF nyob rau hauv siab shear (≥3000 rpm, 30 min), ces muab sib tov nrog TPU slurry.
- Tom qab txheej ziab: 120-150 ° C, ncua sij hawm los ntawm 10% kom ua tiav DMF evaporation.
II. Feasibility Analysis ntawm Zinc Borate (ZB)
1. Nplaim Retardant Mechanism thiab qhov zoo
- Mechanism:
- Ua ib txheej B₂O₃ iav ntawm qhov kub thiab txias, thaiv cov pa oxygen thiab cua sov (condensed-theem nplaim hluav taws xob).
- Tso dej ua ke (~ 13%), diluting flammable gases thiab cua txias lub cev.
- Qhov zoo:
- Muaj zog ua haujlwm zoo nrog AHP lossis txhuas trihydroxide (ATH).
- Cov pa luam yeeb zoo heev, zoo tagnrho rau cov ntawv siv hluav taws xob tsawg.
2. Daim Ntawv Thov Kev Sib Tw thiab Kev daws teeb meem
| Kev sib tw | Kev daws |
| Tsis zoo dispersion stability | Siv nano-loj ZB (<500nm) thiab cov neeg ua dej ntub dej (xws li TegoDispers 750W). |
| Tsawg nplaim taws retardant efficiency (siab loading xav tau) | Siv raws li kev sib koom ua ke (5-10%) nrog cov nplaim hluav taws kub (xws li AHP lossis organic phosphorus). |
| Txo txheej yooj yooj yim | Txau nrog cov yas yas (piv txwv li, DOP lossis polyester polyols). |
3. Pom zoo tsim thiab txheej txheem
- Piv txwv Formulation:
- TPU / DMF puag: 100 phr
- Nano-sized ZB: 8 phr
- AW: 15 hr
- Wetting agent (Tego 750W): 1 phr
- Txheej Txheem Ntsiab Lus:
- Pre-disperse ZB hauv DMF ntawm hlaws milling (particle loj ≤2μm) ua ntej sib tov nrog TPU slurry.
- Txuas lub sij hawm kom qhuav (xws li, 30 min) kom tsis txhob muaj cov dej seem uas cuam tshuam rau cov nplaim hluav taws.
III. Synergistic ntsuam xyuas ntawm AHP + ZB System
1. Synergistic nplaim retardant teebmeem
- Gas-Phase & Condensed-Phase Synergy:
- AHP muab phosphorus rau charring, thaum ZB stabilizes char txheej thiab suppresses afterglow.
- Ua ke LOI: 28-30%, UL94 V-0 (1.6mm) ua tiav.
- Kev haus luam yeeb:
- ZB txo cov pa luam yeeb los ntawm> 50% (Cone Calorimeter test).
2. Cov lus pom zoo sib npaug
- Mechanical Property Compensation:
- Ntxiv 2-3% TPU plasticizer (xws li, polycaprolactone polyol) kom tswj tau yooj yim (elongation> 300%).
- Siv cov hmoov ultrafine (AHP / ZB <2μm) kom txo qis zog tensile poob.
- Txheej Txheem Stability Control:
- Tuav slurry viscosity ntawm 2000-4000 cP (Brookfield RV, spindle 4, 20 rpm) rau cov txheej txheej.
IV. Sib piv nrog Solvent-Based Liquid Flame Retardants
| Parameter | AHP + ZB System | Liquid Phosphorus-Nitrogen FR (eg, Levagard 4090N) |
| Chaw thau khoom | 20-30% | 15-25% |
| Dispersion nyuaj | Yuav tsum tau kho ua ntej (siab shear/surface modification) | Direct dissolution, tsis xav tau dispersion |
| Nqi | Tsawg (~ $ 3-5 / kg) | Siab (~ $ 10-15 / kg) |
| Environmental Impact | Halogen-dawb, tsis muaj tshuaj lom | Tej zaum yuav muaj halogens (khoom-dependent) |
| Txheej Transparency | Semi-translucent rau opaque | Pob tshab heev |
V. Pom zoo cov kauj ruam ua
- Lab-Scale Testing:
- Ntsuas AHP / ZB tus kheej thiab ua ke (gradient loading: 10%, 15%, 20%).
- Ntsuas kev ruaj ntseg dispersion (tsis muaj sedimentation tom qab 24h), viscosity hloov, thiab txheej txheej uniformity.
- Pilot-Scale Validation:
- Optimize ziab tej yam kev mob (lub sij hawm / kub) thiab kuaj nplaim retardancy (UL94, LOI) thiab txhua yam khoom.
- Sib piv cov nqi: Yog tias AHP + ZB txo cov nqi los ntawm> 30% piv rau cov kua FRs, nws muaj txiaj ntsig zoo.
- Scale-Up Npaj:
- Koom tes nrog cov neeg muag khoom los tsim ua ntej-dispersed AHP / ZB masterbatches (DMF-raws li) rau kev tsim khoom yooj yim.
VI. Xaus
Nrog cov txheej txheem tswj kev tawg, AHP thiab ZB tuaj yeem ua cov nplaim hluav taws zoo rau TPU / DMF txheej, muab:
- Kev hloov kho deg + high-shear dispersionyog siv los tiv thaiv particle agglomeration.
- AHP (thawj) + ZB (synergist)balances efficiency thiab nqi.
- Rausiab transparency/flexibilitycov kev cai, kua phosphorus-nitrogen FRs (piv txwv li, Levagard 4090N) tseem nyiam.
Sichuan Taifeng Tshiab Nplaim Retardant Co., Ltd. (ISO & REACH)
Email: lucy@taifeng-fr.com
Post lub sij hawm: May-22-2025
