Cov tshuaj tsuag ua npuas ncauj rwb thaiv tsev yog ib qho kev daws teeb meem zoo heev uas muaj ob yam khoom xyaw tseem ceeb: polyol resins thiab ib hom isocyanate tshwj xeeb. Thaum cov khoom xyaw no sib xyaw ua ke, lawv ua rau muaj ua npuas ncauj uas nthuav dav thiab khov ua polyurethane. Cov tshuaj tsuag polyurethane ua npuas ncauj muaj ntau yam thiab ua haujlwm tau zoo vim tias lawv muaj cov pa roj uas tsis muaj hluav taws xob ntau hauv lawv cov qhov hws, uas ua rau lawv cov khoom rwb thaiv tsev zoo dua. Muaj ob hom tshuaj tsuag ua npuas ncauj rwb thaiv tsev tseem ceeb: qhib thiab kaw. Txhua hom muaj cov txiaj ntsig tshwj xeeb thiab thaj chaw siv.
Cov Tshuaj Tsuag Ua Npuas Ncauj Ua Los Ntawm Dab Tsi?
Thaum cov polyols thiab isocyanates sib xyaw ua ke, lawv tsim ua npuas dej, tsim cov qauv polymer muaj zog. Qhov qis qis thiab mos mos, cov qauv yooj ywm ntawm cov ua npuas dej qhib-cell ua rau nws zoo tagnrho rau kev siv sab hauv tsev uas xav tau kev nqus suab. Ntawm qhov tod tes, cov ua npuas dej kaw-cell yog denser thiab tawv dua. Nws cov qhov hws kaw tag nrho, ntes cov pa roj thiab yog li ua rau R-tus nqi nce, uas qhia txog kev rwb thaiv tsev zoo heev. Cov ua npuas dej kaw-cell yog cov dej noo-resistant thiab ua haujlwm ob npaug ua huab cua thiab pa dej thaiv, ua rau lawv nrov heev hauv cov chaw xav tau.
Siv Cov Tshuaj Tsuag Ua Npuas Ncauj Qhov Twg?
Cov ua npuas dej txau siv dav hauv kev siv hauv tsev, kev lag luam thiab kev lag luam. Cov ua npuas dej qhib yog paub txog nws cov suab rwb thaiv tsev zoo thiab feem ntau siv rau ntawm phab ntsa sab hauv, pem teb thiab qab nthab. Vim nws qhov ceev thiab ruaj khov, cov ua npuas dej kaw feem ntau siv rau phab ntsa sab nraud, qab nthab, qhov chaw nkag, thiab qab nthab.
Cov ua npuas dej uas kaw lub qhov rais yog qhov zoo tshaj plaws rau kev rwb thaiv tsev. Cov khoom siv no tsis yog tsuas yog ua haujlwm rwb thaiv tsev xwb, tab sis kuj tseem muab cov pa thiab cua thaiv, uas yog qhov tseem ceeb los tiv thaiv kev sib sau ua ke ntawm cov dej noo hauv lub qhov rais. Los ntawm kev thaiv cov cua thiab cov dej noo, cov ua npuas dej uas kaw lub qhov rais pab tswj qhov kub thiab txias hauv tsev, txo cov nqi hluav taws xob thiab tiv thaiv cov khoom siv los ntawm kev puas tsuaj los ntawm dej.
Cov Tshuaj Polyurethane Catalysts hauv Cov Ntawv Thov Ua Npuas Ncauj
Cov catalysts polyurethane zoo liMXC-BDMA(N,N-dimethylbenzylamine) thiabMXC-TMAyog ib qho tseem ceeb hauv kev tsim cov tshuaj tsuag ua npuas ncauj rwb thaiv tsev. MXC-BDMA txhim kho qhov ntws thiab cov qauv ntawm lub cell ntawm cov npuas ncauj, txhawb kev faib tawm sib npaug thiab kev nplaum zoo heev rau cov substrates. Cov catalyst no yog siv dav hauv cov npuas polyurethane tawv, xyuas kom meej tias cov npuas ncauj kho nrog lub zog zoo tshaj plaws thiab ruaj khov. MXC-TMA, ib qho tertiary amine catalyst, yog tsim rau cov ntawv thov uas xav tau kev tswj hwm polyisocyanurate tshuaj tiv thaiv, xws li cov npuas ncauj tawv siv hauv cov ntawv thiab rwb thaiv tsev rau cov khoom siv xws li lub tub yees. Nws pab txhawb rau kev kho kom du dua, xyuas kom meej tias muaj zog thiab kev ua tau zoo dhau sijhawm.
Cov tshuaj tsuag ua npuas ncauj tseem yog ib qho kev daws teeb meem zoo vim nws yooj yim hloov pauv, muaj txiaj ntsig zoo ntawm kev rwb thaiv tsev, thiab muaj cov yam ntxwv tiv thaiv. Yog tias muaj cov tshuaj catalysts zoo, cov ntawv thov polyurethane ua npuas ncauj ua tau raws li qhov yuav tsum tau ua haujlwm zoo hauv ntau qhov chaw tsim kho.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-04-2024