Dab tsi yogpolyether polyol?
Polyether polyols (hu ua polyether) yog tsim los ntawm polycondensation cov tshuaj tiv thaiv ntawm ib tug starter (ib tug compound uas muaj active hydrogen pawg) nrog epoxides xws li ethylene oxide (EO), propylene oxide (PO), thiab butylene oxide (BO) nyob rau hauv lub xub ntiag. ntawm ib tug catalyst. Polyether polyols tau siv dav hauv kev tsim ntau hom polyurethane elastomers, txheej, nplaum, sealants, dej-raws li polyurethanes, thiab lwm yam. Lawv tuaj yeem hloov pauv tetrahydrofuran polyether thiab polyester polyols, txo cov nqi tsim khoom thiab txhim kho cov khoom zoo hauv kev lag luam.
Polyether polyols yog cov ntaub ntawv tseem ceeb rau polyurethane ua npuas ncauj. Polyether polyols muab tau los ntawm polyesters kuj tseem siv los tsim cov polyisocyanurate foams.
Polyether polyols muaj ntau cov khoom siv raw. Cov pa tsis zoo ua npuas ncauj polyether polyols yog tus nqi-zoo, thiab polyether-raws li polyurethanes qhia tau zoo tiv thaiv hydrolysis.
Dab tsi yog qhov zoo ntawm polyester polyols?
Nws muaj zog ua npuas ncauj, zoo adhesion, siab elongation, thiab zoo heev roj kuj. Txawm li cas los xij, lawv muaj qis dua rau hydrolysis piv rau polyether foams. Polyether polyols feem ntau yog siv rau hauv kev npaj cov yas polyurethane ua npuas ncauj, dav siv hauv cov tub yees, lub freezers, cov tsheb tub yees, cov khoom siv rwb thaiv tsev, cov yeeb nkab rwb thaiv tsev, thiab lwm yam. Cov khoom tsim tau muaj cov thermal conductivity tsawg thiab zoo heev qhov ntev stability, ua polyether polyols tseem ceeb raw cov ntaub ntawv rau composite polyether formulations. Polyether polyol ntau lawm nyob rau hauv kev lag luam polyurethane yog tsuas yog siv nyob rau hauv zus tau tej cov polyurethane ua npuas ncauj yas, nrog rau ntau yam xws li polyoxypropylene polyols thiab polytetrahydrofuran polyols.
Yuav khaws cia li caspolyether polyol?
Cov thawv rau khaws cia polyether polyols tuaj yeem ua los ntawm cov hlau, txhuas, polyethylene, lossis polypropylene. Qhov ntsuas kub yuav tsum tsis pub tshaj 70 degree, thiab tiv thaiv kom tsis txhob ya raws thiab oxidation, nws raug nquahu kom sau cov ntim nrog nitrogen gas. Polyether polyol cov khoom yog feem ntau ntim rau hauv huv si, qhuav, kaw, thiab cov ntaub ntawv pov thawj galvanized hlau nruas. Thaum lub sijhawm khaws cia, yuav tsum tau ceev faj kom tsis txhob raug tshav ntuj thiab los nag thiab kom deb ntawm cov nplaim taws.
Feem ntau, toxicity ntawm nruab nrab polyether polyols thaum noj qhov ncauj los yog nyob rau hauv kev sib cuag nrog daim tawv nqaij, ob lub qhov muag, los yog mucous daim nyias nyias yog negligible, thiab yog li ntawd, tsis muaj kev tiv thaiv tus kheej thaum siv. Txawm li cas los xij, amine-based polyether polyols tuaj yeem ua rau tawv nqaij thiab qhov muag vim lawv cov alkalinity, yog li kev nyab xeeb iav thiab hnab looj tes yuav tsum hnav thaum tuav. Yog tias polyether polyols ua raws li daim tawv nqaij, ntxuav nrog dej ntau; yog tias lawv tau ntsib nrog lub qhov muag, yaug qhov muag nrog dej tsawg kawg 15 feeb. Nyob rau hauv cov ntaub ntawv ntawm nchuav, cov ntaub ntawv absorbent xws li sawdust, xuab zeb, los yog ntaub yuav tsum tau siv los tshem tawm cov polyether polyols, tom qab ntawd yaug nrog dej kom ntau.