Txoj Kev Npaj Tseem Ceeb Ntawm Polyethersulfone
Ib txoj hauv kev los ua ke polyethersulfone resin, cov ntaub ntawv tseem ceeb ntawm cov bisphenol S thiab 4, 4-dichlorodiphenyl sulfone hauv cov molar ratios tsis sib npaug, nyob rau hauv bisphenol S thiab 4, 4-dichlorodiphenyl sulfone Cov molar ratio yog 0.90~0.999:1; Qhov loj piv ntawm cov kuab tshuaj siv nyob rau hauv cov txheej txheem tshuaj tiv thaiv yog 3: 5 ~ 5: 2 sib xyaw hnyav ntawm dimethyl sulfone thiab sulfolane, xylene yog siv los ua tus neeg ua kom lub cev qhuav dej, K2CO3 yog siv los ua ntsev ua tus neeg sawv cev, tag nrho cov tshuaj tiv thaiv txheej txheem tau nqa tawm hauv qab no. tiv thaiv nitrogen. Cov ntsiab lus ntawm cov txheej txheem yog tswj ntawm 25 feem pua ~ 40 feem pua, cov xylene yog 10 feem pua ~ 20 feem pua ntawm cov hnyav hnyav, thiab cov molar npaum li cas ntawm K2CO3 yog 1.01 ~ 1.1 npaug ntawm bisphenol S.
Cov kauj ruam tshwj xeeb yog: ntxiv {{0}}.5 mol ntawm 4, 4-dichlorodiphenyl sulfone, 0.4985 mol ntawm bisphenol S, thiab 3: 5 huab hwm coj piv ntawm dimethyl sulfone rau sulfolane rau hauv plaub- necked flask nruab nrog ib tug condensation dej separator thiab tus pas ntsuas kub. Sib tov cov kuab tshuaj 987.45g, xylene 148.118g thiab K2CO372.3321g, do thiab cua sov nyob rau hauv kev tiv thaiv nitrogen kom txog thaum tag nrho cov tshuaj ntxiv tau yaj thiab txuas ntxiv kom sov txog 100 degree ~ 110 degree, cov tshuaj tiv thaiv pib rau azeotrope, txheej txheej sab saud. xylene yog refluxed rau hauv lub khob, Cov dej noo nyob rau hauv qis txheej ntws tawm ncaj qha. Thaum lub sij hawm cov txheej txheem cov tshuaj tiv thaiv, cov saum toj no-hais tov tov hnyav tau txuas ntxiv dropwise los hloov cov steamed dej kom tswj cov kua theem sib npaug. Tom qab tag nrho cov dej hauv cov tshuaj tiv thaiv tau raug tshem tawm azeotropically, cov reflux tau txuas ntxiv rau 30 feeb kom ua kom lub zog tawm ntawm xylene. Nce qhov kub kom txog 220 degree, txuas ntxiv cov tshuaj tiv thaiv rau 4-5 teev, tom qab ntawd nres cua sov thiab txuas ntxiv yaug nrog nitrogen kom txog thaum cov tshuaj kub yog 95 degree -100 degree . Cov tshuaj tau maj mam hliv rau hauv lub khob huv si thiab muab tso rau hauv lub fume hood kom txias ib txwm mus rau chav tsev kub. Cov khoom tau raug muab ziab rau hauv lub tshuab nqus tsev, crushed thiab tom qab ntawd rhaub dua nrog dej distilled rau 10 lub sij hawm kom tshem tawm cov kuab tshuaj thiab cov khoom los ntawm cov khoom, thiab siv cov tshuaj AgNO3 tau kuaj pom kom txog thaum tsis muaj nag lossis daus dawb tshwm, thiab tom qab ntawd qhuav hauv. lub tshuab nqus tsev qhov cub kom tau txais polyethersulfone cob.
