Dab tsi yog Mechanism of Action ntawm Amine Catalysts ntawm Polyurethane?
Amine catalystsyog ib qho tseem ceeb ntawm polyurethane ntau lawm thiab yog ib qho tseem ceeb accelerators uas ua rau kom cov tshuaj tiv thaiv ntawm polyols thiab isocyanates (lub ntsiab feedstock rau polyurethane ua npuas ncauj ntau lawm), tswj thiab sib npaug ntawm cov tshuaj tiv thaiv gel thiab cov pa roj los yog ua npuas ncauj cov tshuaj tiv thaiv ua npuas ncauj. Lawv ua qhov no los ntawm kev txo cov kev ua kom lub zog xav tau rau cov tshuaj tiv thaiv, ua rau kom ceev thiab tswj tau ntau dua ua npuas ncauj nthuav dav thiab solidification. Amine catalysts muaj txiaj ntsig tshwj xeeb vim tias lawv nquag koom nrog cov tshuaj tiv thaiv, pawg tshuaj tiv thaiv hauv lawv cov qauv molecular tuaj yeem cuam tshuam nrog isocyanates, thiab amine catalysts feem ntau tsim los ntawm {{0}}}.1% thiab 5.0% ntawm polyurethane formulations. . Cov cuab yeej tshwj xeeb no ua rau lawv khi rau polyisocyanates, stabilizing qhov kawg polyurethane matrix thiab xyuas kom nws adhesion rau lub substrate.
Cov txheej txheem catalytic ntawm amine catalyst nyob rau hauv polyurethane ua npuas ncauj feem ntau txhawb ob lub ntsiab lus: cov tshuaj tiv thaiv polyol-isocyanate (tsim carbamate bonds) thiab isocyanate-dej cov tshuaj tiv thaiv (tsim carbon dioxide). Cov tshuaj tiv thaiv tom kawg ua npuas, tsim cov qauv ntawm tes ua npuas dej. Los ntawm qhov kev ua ob zaug no, cov amine catalyst ua rau muaj kev sib npaug ntawm cov foaming thiab kho cov txheej txheem, kom ntseeg tau tias cov npuas dej nthuav dav tusyees thaum solidifying rau hauv cov qauv ruaj khov. Catalysts xws liMXC -70kuj muab ib tug smooth upward cov tshuaj tiv thaiv nkhaus, uas txhais tau hais tias lawv txhawb ib tug maj mam nce nyob rau hauv ua npuas ncauj viscosity. Qhov no ua rau muaj kev tswj hwm ntau dua thiab cov qauv honeycomb uas pab txhim kho lub zog thiab ruaj khov ntawm cov npuas dej.
Field of Application of Amine Catalysts
Amine catalysts yog siv nyob rau hauv ntau yam ntawm polyurethane daim ntaub ntawv, nrog rau cov mos mos thiab tawv foams, elastomers, coatings, adhesives, thiab sealants. Hauv kev tsim cov foams mos, lawv pab ua tiav qhov xav tau softness thiab elasticity, ua rau lawv zoo tagnrho rau cov rooj tog zaum hauv ncoo, txaj txaj thiab lub rooj zaum hauv tsheb. Rau cov ntawv thov txhav txhav, xws li cov vaj tse rwb thaiv tsev, cov khoom siv, thiab tshuaj tsuag thiab cov khoom siv tshuaj tsuag thiab nqus tau ruaj khov.
Amine catalysts xws li MXC-70 yog tshwj xeeb tshaj yog haum rau cov ntaub ntawv rhiab heev vim lawv cov ntxhiab tsw, tsawg-emission zog. Hauv cov khoom siv hauv tsev, lawv txhim kho adhesion rau hlau thiab yas substrates, uas yog qhov tseem ceeb rau kev rwb thaiv tsev. Nyob rau hauv cov tshuaj tsuag thiab lub thawv foams, cov catalysts ua kom muaj zog ua npuas ncauj nthuav dav thiab adhesion rau lub substrate thaum txo cov ntxhiab tsw seem thiab emissions thiab ua tau raws li ib puag ncig thiab kev tswj cov qauv.
Zuag qhia tag nrho, ntau yam thiab kev ua tau zoo ntawm amine catalysts ua rau lawv yog ib qho tseem ceeb hauv kev lag luam uas xav tau polyurethane rwb thaiv tsev, buffering, thiab cov khoom sib txuas. Mingxu Chemical Company tau tsim polyurethane catalysts rau ntau tshaj 20 xyoo, peb muaj cov txheej txheem zoo tshaj plaws thiab pab neeg ua haujlwm kom zoo thiab hloov kho cov khoom catalyst rau kev ua lag luam, cov khoom siv loj, txais tos cov neeg siv khoom tuaj sab laj.
