Kho Catalyst Siv Ua tib zoo
Catalysts muab ib txoj hauv kev zoo tshaj plaws rau kev tswj cov tshuaj tiv thaiv ceev.
Organotin catalysts feem ntau yog siv los ua kom cov tshuaj tiv thaiv ntawm pawg hydroxyl thiab isocyanates, thaum qee cov amine catalysts feem ntau txhawb kev cuam tshuam nrog cov dej noo thiab yog li siv ceev faj hauv cam khwb cia elastomer systems.
Vim tias cov catalysts muaj zog heev, txawm tias kev hloov kho me me tuaj yeem hloov pauv lub sijhawm gel thiab kho tus cwj pwm. Cov qib catalyst ntau dhau tuaj yeem ua rau gelation sai, muaj kev ntxhov siab nyob rau hauv, thiab ntau dua shrinkage.
Tswj cov txheej txheem ua haujlwm ruaj khov
Kub muaj qhov cuam tshuam ncaj qha rau cov tshuaj tiv thaiv kinetics.
Lub polyurethane prepolymer feem ntau yog rhuab kom txo viscosity thiab txhim kho kev sib xyaw ua ntej casting. Tus neeg sawv cev kho yuav tsum tau khaws cia nyob rau hauv nws qhov kev pom zoo ua qhov kub thiab txias kom ntseeg tau tias muaj kev sib xyaw ua tiav thiab sib xyaw ua ke.
Pwm kub yog qhov tseem ceeb sib npaug. Cov pwm cua sov kom zoo txhawb nqa kev kho kom zoo thoob plaws txhua qhov thiab pab txo qis kev ntxhov siab sab hauv los ntawm qhov tsis sib xws ntawm qhov kub thiab txias.
Kev tuav cov khoom ruaj khov thiab pwm kub thoob plaws hauv kev tsim khoom ua rau kev coj tus cwj pwm zoo sib xws thiab txhim kho qhov ruaj khov.
Xyuas kom tiav Curing
Kev tswj cov tshuaj tiv thaiv ceev ib leeg tsis txaus. Kev kho kom tiav yog qhov tseem ceeb sib npaug kom tau txais kev ntseeg siab ntev - kev ua tau zoo.
Kev sib xyaw ua ke tso cai rau polyurethane prepolymer thiab curing tus neeg sawv cev kom hnov mob uniformly. Kev sib xyaw ua ke tsis zoo tuaj yeem tawm hauv thaj chaw uas muaj cov isocyanate ntau dhau los yog tsis txaus kho tus neeg sawv cev, ua rau tsis sib haum xeeb thiab qhov sib txawv ntawm qhov sib txawv.
Lub tshuab nqus tsev degassing feem ntau ua ua ntej casting kom tshem tawm cov cua nkag thiab cov pa yaj. Tshem tawm npuas txhim kho ob qho tib si lub zog thiab qhov zoo ntawm qhov chaw.
Tom qab demolding, ntau cam khwb cia polyurethane elastomers tau txais txiaj ntsig los ntawm kev tshaj tawm - kho. Cov kev kho cua sov tswj tau tso cai rau cov pab pawg uas muaj zog ntxiv los ua kom tiav cov txheej txheem kho, txo cov kev ntxhov siab seem thaum txhim kho hardness, tshuaj tiv thaiv, thiab qhov ruaj khov.
Common Processing Issues thiab Solutions
Ntau qhov teeb meem tsim khoom feem ntau tuaj yeem taug qab los tswj cov tshuaj tiv thaiv tsis raug.
Yog tias cov tshuaj tiv thaiv tshwm sim sai heev, txo cov khoom kub, txo cov tshuaj catalyst, los yog xaiv cov tshuaj tua kab mob tuaj yeem ua rau lub sijhawm ua haujlwm.
Yog tias kev kho qeeb dhau, kev ua kom kub nce ntxiv, ua kom zoo dua catalyst concentration, los yog xaiv cov tshuaj tua kab mob ntau dua tuaj yeem txhim kho kev kho kom zoo.
Thaum muaj qhov shrinkage ntau dhau lawm, cov tuam txhab lag luam yuav tsum ntsuas qhov NCO index, kho lub sijhawm, pwm kub, thiab tom qab- txheej txheem kho kom paub qhov laj thawj.
Ua tiav kev ua tau zoo ntawm polyurethane
Kev ua tiav polyurethane ua tiav nyob ntawm kev tswj kom muaj qhov sib npaug ntawm kev tsim qauv thiab kev tswj cov txheej txheem. Ua tib zoo xaiv cov polyurethane prepolymer, curing agent, catalyst, kub, thiab curing tej yam kev mob tso cai rau manufacturers tsim elastomer Cheebtsam nrog zoo ib yam, zoo heev hnav tsis kam, thiab txhim khu kev qha qhov tseeb.
Raws li ib qho kev paub txog polyurethane chaw tsim tshuaj paus, peb muab siab - zoo polyurethane prepolymers thiab kev pab txhawb nqa rau cam khwb cia polyurethane elastomer ntau lawm. Peb pab neeg ua haujlwm engineering tuaj yeem pom zoo cov qauv tsim thiab kev daws teeb meem raws li koj qhov kev thov, pab koj ua tiav kev tsim khoom ruaj khov thiab ua haujlwm zoo.