Lub Mechanism of Action ntawm Amine Catalysts ntawm Polyurethane yog dab tsi?
Cov tshuaj amine catalystsyog ib feem tseem ceeb ntawm kev tsim cov polyurethane thiab yog cov khoom siv ceev ceev uas ua kom cov tshuaj tiv thaiv ntawm polyols thiab isocyanates (cov khoom noj tseem ceeb rau kev tsim cov polyurethane ua npuas ncauj), tswj thiab sib npaug ntawm cov tshuaj tiv thaiv gel thiab cov roj lossis ua npuas ncauj uas tsim cov npuas ncauj. Lawv ua qhov no los ntawm kev txo cov zog ua kom muaj zog rau cov tshuaj tiv thaiv, ua rau cov npuas ncauj nthuav dav thiab khov sai dua thiab tswj tau zoo dua. Cov tshuaj amine catalysts muaj txiaj ntsig zoo vim tias lawv koom nrog hauv cov tshuaj tiv thaiv, cov pab pawg tiv thaiv hauv lawv cov qauv molecular tuaj yeem cuam tshuam nrog isocyanates, thiab amine catalysts feem ntau ua rau ntawm 0.1% thiab 5.0% ntawm cov qauv polyurethane. Cov khoom tshwj xeeb no ua rau lawv khi rau polyisocyanates, ua kom cov polyurethane matrix kawg ruaj khov thiab xyuas kom meej tias nws lo rau lub substrate.
Cov txheej txheem catalytic ntawm amine catalyst hauv polyurethane ua npuas ncauj feem ntau txhawb nqa ob qho kev cuam tshuam tseem ceeb: polyol-isocyanate reaction (kev tsim cov carbamate bonds) thiab isocyanate-water reaction (kev tsim cov pa roj carbon dioxide). Qhov kev cuam tshuam tom kawg tsim cov npuas, tsim cov qauv cellular ntawm ua npuas ncauj. Los ntawm qhov kev ua ob npaug no, amine catalyst ua rau muaj kev sib npaug ntawm kev ua npuas ncauj thiab kev kho, kom ntseeg tau tias ua npuas ncauj nthuav dav thaum khov kho mus rau hauv cov qauv ruaj khov. Cov catalysts xws liMXC-70kuj muab cov kab rov tav du thiab nce mus rau sab saud, uas txhais tau tias lawv txhawb kom maj mam nce ntxiv hauv cov ua npuas ncauj viscosity. Qhov no ua rau muaj cov qauv honeycomb uas tswj tau zoo dua thiab sib xws uas pab txhim kho kev ruaj khov thiab kev ruaj khov ntawm cov ua npuas ncauj.
Daim Ntawv Thov ntawm Amine Catalysts
Cov tshuaj amine catalysts siv rau ntau yam kev siv polyurethane, suav nrog cov ua npuas mos thiab tawv, elastomers, coatings, adhesives, thiab sealants. Hauv kev tsim cov ua npuas mos, lawv pab ua tiav qhov mos thiab elasticity xav tau, ua rau lawv zoo tagnrho rau cov rooj tog zaum, cov ntaub pua chaw pw thiab cov rooj zaum hauv tsheb. Rau cov ntawv thov ua npuas tawv, xws li cov vaj huam sib luag rwb thaiv tsev, cov khoom siv hluav taws xob, thiab cov ua npuas tsuag, amine catalysts txhawb cov qauv kaw cell siab uas txhim kho kev rwb thaiv tsev kub thiab kev ruaj khov ntawm qhov ntev.
Cov tshuaj amine catalysts xws li MXC-70 yog qhov tsim nyog rau cov ntawv thov rhiab heev vim lawv cov yam ntxwv tsis muaj ntxhiab tsw thiab tsis muaj pa phem. Hauv cov khoom siv hauv tsev, lawv txhim kho kev lo rau cov hlau thiab yas substrates, uas yog qhov tseem ceeb rau kev rwb thaiv tsev. Hauv cov tshuaj tsuag thiab lub thawv ua npuas ncauj, cov tshuaj catalysts no ua rau cov npuas ncauj nthuav dav thiab lo rau cov substrate thaum txo cov ntxhiab tsw thiab pa phem thiab ua tau raws li cov qauv ib puag ncig thiab kev cai lij choj.
Zuag qhia tag nrho, qhov ua tau ntau yam thiab ua tau zoo ntawm cov amine catalysts ua rau lawv yog ib qho tseem ceeb hauv kev lag luam uas xav tau polyurethane rwb thaiv tsev, buffering, thiab bonding properties. Mingxu Chemical Company tau tsim cov polyurethane catalysts tau ntau tshaj 20 xyoo, peb muaj txoj kev ua haujlwm zoo tshaj plaws thiab pab pawg kws tshaj lij los txhim kho thiab hloov kho cov khoom catalyst rau kev ua lag luam, muaj ntau yam khoom siv, txais tos cov neeg siv khoom tuaj sab laj.
Lub sijhawm tshaj tawm: Lub Kaum Hli-29-2024