PEG-400

Polyethylene Glycol 400 (PEG{12}}400) yog ib qho hnyav molecular, pob tshab, tsis muaj xim, thiab ze li ntawm odorless viscous kua nrog qhov nruab nrab molecular hnyav li ntawm 380-420 g / mol. Nws belongs rau chav kawm ntawm nonionic polymers. Nws cov khoom siv lub cev muaj xws li dynamic viscosity ntawm kwv yees li 90-110 cP ntawm chav tsev kub (25 degree), qhov chaw khov ntawm 4-8 degree, thiab hygroscopicity tseem ceeb, ua rau nws nqus dej los ntawm ib puag ncig. PEG-400 nthuav tawm zoo heev solubility thiab compatibility, yog miscible nrog dej, cawv, glycerin, thiab feem ntau polar solvents nyob rau hauv ib feem. Nws ua hauj lwm raws li ib tug zoo co-solvent los txhim kho compatibility ntawm aqueous theem thiab ntau yam organic Cheebtsam, txawm hais tias nws muaj tsis tshua muaj solubility nyob rau hauv aliphatic hydrocarbons.

Chemically ruaj khov, nws tiv taus cov acids tsis muaj zog, tsis muaj zog hauv paus, thiab electrolytes, nrog cov ntaub ntawv toxicological zoo (qhov ncauj LD₅₀> 30,000 mg / kg). Nws ua raws li USP/NF, EP, FDA, thiab lwm yam thoob ntiaj teb pharmacopoeia thiab zaub mov additive qauv.

Nws feem ntau yog siv los ua dej -raws li lubricant thiab tso tawm tus neeg sawv cev hauv roj hmab, yas, thiab hlau ua; raws li ib tug tsis yog -volatile plasticizer nyob rau hauv coatings, adhesives, thiab sealants los txhim kho zaj duab xis yooj thiab durability. Hauv kev lag luam textile ua haujlwm, nws ua haujlwm zoo li fiber ntau softener thiab antistatic tus neeg sawv cev, txhim kho cov ntaub tes thiab kev ua haujlwm.

Roj av yog ntxiv rau lub reactor, thiab txhuas isopropoxide yog ntxiv raws li ib tug catalyst (catalyst tus nqi: 1.01% -1.03% ntawm tag nrho cov monomer tus nqi) nyob rau hauv stirring. Tom qab hloov cov huab cua nyob rau hauv lub reactor nrog nitrogen, ethylene oxide monomer yog ntxiv (solvent: ethylene oxide=2: tshuaj phau ntawv 1, huab hwm coj ratio). Cov tshuaj tiv thaiv yog nqa tawm ntawm 10-20℃rau 4 teev. Tom qab ntawd, qhov kub thiab txias yog maj mam nce mus rau 35-40 degree, thiab cov tshuaj tiv thaiv yog nqa tawm rau lwm 3 teev. Tom qab cov tshuaj tiv thaiv polymerization tiav lawm, cov khoom raug xa mus rau lub nkoj distillation kom distilled tawm qhov hnyav, txias kom crystallize, lim, thiab tau txais cov khoom nyoos. Vacuum drying yields cov khoom tiav.

Polyethylene glycol (PEG) yog ib qho nonionic, dej -soluble polymer. Nws yog sib xws nrog ntau yam polarity, tab sis muaj kev sib raug zoo nrog tsawg - cov khoom polarity. Tsawg molecular hnyav PEGs feem ntau muaj kev sib raug zoo dua. PEG tuaj yeem ua tau zoo lossis ib feem sib xyaw nrog cov protein, oxidized starch, nitrocellulose, polyvinyl acetate, thiab zein. Nws yog immiscible nrog beeswax, castor roj, gelatin, pos hniav arabic, ntxhia roj, txiv roj roj, thiab paraffin ciab.