Fluoropolymer Monomer Synthesis: Tetrafluoroethylene, Hexafluoropropylene, Perfluoroalkyl Vinyl Ethers, Chlorotrifluoroethylene, Vinylidene Fluoride, Vinyl Fluoride.
Abubuwan da ke cikin Tetrafluoroethylene
Tetrafluoroethylene mara launi ne, mara wari, mara ɗanɗano, iskar gas mara guba wanda ke tafasa a 76.3 C kuma yana narkewa a 142.5 C. Matsakaicin zafin jiki da matsa lamba na TFE sune 33.3 C da 3.92 MPa.Ana adana TFE azaman ruwa;tururi matsa lamba a 20 C ne 1 MPa.An ba da rahoton cewa zafin samuwarsa ya kai 151.9 kcal/mole.Polymerization na TFE yana da ƙarfin gaske kuma yana haifar da 41.12 kcal / mole heatd iyakar wanda za'a iya kwatanta shi da zafi na polymerization na vinyl chloride da styrene, a 23-26 kcal / mole da 16.7 kcal / mole, bi da bi.
Amintaccen ajiyar TFE yana buƙatar abun ciki na oxygen ya zama ƙasa da 20 ppm.Ya kamata a sarrafa zafin jiki da matsa lamba yayin ajiyarsa.Ƙara yawan zafin jiki, musamman a matsanancin matsin lamba, na iya fara lalatawa idan babu iska (TFE ya ƙasƙantar da shi zuwa carbon tetrafluoride).A gaban iska ko iskar oxygen, TFE yana samar da gaurayawan abubuwan fashewa a cikin kewayon kashi 14-43%.Fashewar cakuda TFE da oxygen na iya ƙara matsakaicin matsa lamba zuwa sau 100 na farkon matsa lamba.
Abubuwan da ke cikin Hexafluoropropylene
Hexafluoropropylene ba shi da launi, mara wari, maras ɗanɗano, kuma ƙarancin ƙarancin iskar gas, wanda ke tafasa a 29.4 C kuma yana daskarewa a 156.2 C. A cikin bayyanar 4-hour, ƙaddamar da 3000 ppm ya dace da LC50 a cikin berayen.Matsakaicin zafin jiki da matsa lamba na HFP sune 85 C da 3254 MPa.Ba kamar TFE ba, HFP yana da tsayin daka sosai dangane da autopolymerization kuma ana iya adana shi cikin yanayin ruwa ba tare da ƙarin telogen ba.HFP yana da kwanciyar hankali har zuwa 400e500 C. A kusan 600 C a ƙarƙashin injin, yana lalata kuma ya samar da octafluoro-2-butene (CF3CF¼ CFCF3) da octa-fluoroisobutylene.
Abubuwan da ke cikin Perfluoroalkyl Vinyl Ethers
Perfluoroalkyl vinyl ethers (PAVE) sun samar da wani muhimmin aji na monomers a cikin cewa su ne comonomers na zabi don "gyara" na kaddarorin homofluoropolymers ban da m amfani a cikin tsarin copolymers na TFE.Hauka na PAVEs azaman masu gyara akan HFP shine ingantaccen yanayin yanayin zafi.Misali mai mahimmanci na kasuwanci shine per-fluoropropyl vinyl ether (PPVE).PPVE ruwa ne mara wari, mara launi a zafin jiki.Yana da ƙonewa sosai kuma yana ƙonewa da harshen wuta marar launi.Ba shi da guba fiye da HFP.
Abubuwan da ke cikin Chlorotrifluoroethylene
Chlorotrifluoroethylene iskar gas mara launi a dakin da zafin jiki da matsa lamba.Yana da guba mai guba tare da LC50 (bera) a bayyanar sa'o'i 4 da taro na 4000 ppm.Yana da matsanancin zafin jiki da matsa lamba na 105.8 C da 4.03 MPa.Oxygen da ruwa CTFE suna amsawa kuma suna samar da peroxides a ƙananan yanayin zafi.Yawancin samfuran oxygenated, irin su chlorodifluoroacetylfluoride, ana haifar da iskar oxygen ta CTFE.Irin wannan dauki zai iya faruwa photochemically a cikin tururi lokaci.Chlorotrifluoroethylene oxide ne ta-samfurin wannan dauki.peroxides suna aiki azaman masu farawa don polymerization na CTFE, wanda zai iya faruwa da ƙarfi.
Abubuwan da ke cikin Vinylidene Fluoride
Vinylidene fluoride, (CH2¼CF2), [49] mai ƙonewa ne kuma iskar gas ne a zafin ɗaki.Ba shi da launi kuma kusan ba shi da wari kuma yana tafasa a 84 C. VDF na iya ƙirƙirar gaurayawan fashewa da iska.Polymerization na wannan gas yana da matuƙar exothermic kuma yana faruwa sama da matsanancin zafin jiki da matsa lamba.
Kayayyakin Vinyl Fluoride
Vinyl fluoride (75-02-5) (fluoroethene) iskar gas mara launi a yanayin yanayi.Yana ƙonewa a cikin iska tsakanin iyakar 2.6 da 22% ta ƙarar.Mafi ƙarancin zafin wuta don VF da gaurayawan iska shine 400 C. Ƙara adadin alamar (<0.2%) na terpenes yana da tasiri don hana polymerization na VF.Ma'aikatar Sufuri ta Amurka ta ƙirƙira VF da aka hana a matsayin iskar gas mai ƙonewa.
Lokacin aikawa: Mayu-10-2018