Foam stabilizer: tseem hu ua npuas stabilizer. Cov npuas dej stabilizer tam sim no siv feem ntau yog polysiloxane surfactant, uas yog tus neeg sawv cev tseem ceeb rau kev tsim cov polyurethane ua npuas ncauj.
Nws yog tsuas yog siv los ua npuas dej stabilizer los sib tov cov ntaub ntawv raw khoom sib npaug thaum lub sijhawm ua npuas dej, txo qhov nro ntawm qhov system los txhawb cov nucleation thiab txhawb cov npuas dej, thiab zam qhov tshwm sim ntawm qhov tshwm sim tsis zoo xws li kev poob qis, ntxhib pores, thiab tawg. .
Hom thiab Kev Ua Haujlwm ntawm Foam Stabilizers
Ua npuas ncauj stabilizers tau muab faib ua cov ua npuas ncauj stabilizers thiab tawv ua npuas ncauj stabilizers. Nws lub luag haujlwm tseem ceeb yog raws li hauv qab no:
Emulsification: Lub compatibility ntawm txhua yam nyob rau hauv lub foam formulation yog tsis zoo. Ua npuas ncauj stabilizer muaj lipophilic thiab hydrophilic molecular qauv, uas muaj peev xwm emulsify lub foaming raw cov ntaub ntawv thiab txhim kho lub compatibility lub xeev ntawm cov ntaub ntawv ua ntej thiab thaum lub sij hawm cov tshuaj tiv thaiv, thiaj li yuav ua rau cov foaming cov tshuaj tiv thaiv thiab cov cross-linking cov tshuaj tiv thaiv mus smoothly.
Nucleation thiab foam stabilization: Lub foam stabilizer txo qhov nro ntawm cov khoom, thiab pab cov huab cua sib xyaw kom tsim tau ib lub npuas nucleus thaum nplawm, thiab cov roj uas tsim los ntawm cov tshuaj tiv thaiv nkag mus rau hauv cov npuas nucleus thiab ua rau cov npuas loj zuj zus. Thaum lub sij hawm foaming txheej txheem, cov foams stabilizer stabilizes lub thinned cell phab ntsa los ntawm kev txo cov kev ntxhov siab nyob rau hauv lub cell phab ntsa thiab tiv thaiv lub cev qhuav dej ntawm cov ntaub so ntswg loj hlob sai heev kom txog thaum lub cell phab ntsa muaj lub zog txaus thiab muaj peev xwm txhawb nws tus kheej.
Qhib-cell / kaw-cell nyhuv: Lub hlwb ntawm polyurethane hloov tau ua npuas ncauj yuav tsum qhib-celled kom cov khoom muag muag thiab elastic. Vim qhov kev ua ntawm cov npuas stabilizer, thaum lub foaming system nyob rau ntawm qhov tsawg viscosity, lub cell phab ntsa yog ruaj khov thiab cov npuas loj hlob mus rau ib qho twg, lub cell phab ntsa yog thinned, thiab lub cell ruptures nyob rau hauv lub ua ke ntawm cov catalyst. thiab ua npuas ncauj stabilizer, uas yog, "qhib cell". ". Lub foam stabilizer tuaj yeem tswj lub sijhawm ua npuas dej, tshem tawm qhov tsis xws luag xws li ua npuas ncauj tawg thiab kaw lub hlwb, thiab muab cov npuas dej zoo permeability thiab kev nplij siab.
Rau nruj polyurethane ua npuas ncauj, kaw hlwb tuaj yeem ua rau cov khoom ua npuas ncauj muaj cov thermal rwb thaiv tsev zoo thiab muaj zog txhua yam. 95 feem pua ua npuas ncauj kom ntseeg tau tias ua npuas ncauj rwb thaiv tsev ua haujlwm.
Raw Khoom ntawm Foam Stabilizer
Polyurethane ua npuas ncauj stabilizer yog npaj los ntawm hydrosilation cov tshuaj tiv thaiv ntawm allyl polyether thiab polysiloxane nyob rau hauv qhov kev txiav txim ntawm catalyst.
Nws cov ntaub ntawv tseem ceeb raug suav nrog: octamethylcyclotetrasiloxane (cov ntawv luv: D4), hexamethyldisiloxane (cov ntawv luv: MM), polymethyl hydrogen siloxane (cov ntawv luv: siab H), epoxy resin Ethane, propylene oxide, chloroplatinic acid, thiab lwm yam.
Cov txheej txheem ntau lawm ntawm Foam Stabilizer
Muaj peb lub ntsiab tshuaj tiv thaiv nyob rau hauv cov txheej txheem synthesis ntawm foam stabilizer: lub synthesis ntawm allyl polyether nrog tshwj xeeb qauv, lub synthesis ntawm polysiloxane, thiab hydrosilation cov tshuaj tiv thaiv ntawm polyether thiab polysiloxane. Thaum kawg, kev siv cov qauv tsim thev naus laus zis, los ntawm kev ntxiv qee yam khoom ntxiv, los npaj cov khoom ua npuas ncauj stabilizer uas ua tau raws li cov kev xav tau sib txawv.
Qhov yuav tsum tau ua rau Kev Xaiv Ua Npuas Ncauj Stabilizers
Kev xaiv cov kev xav tau rau cov ua npuas ncauj stabilizers
Mos ua npuas ncauj stabilizer yog ib qho polyurea uas tuaj yeem yaj thiab hnov mob hauv thawj theem ntawm foaming, thiab tuaj yeem pab qhib thiab tawg hlwb nyob rau theem tom qab ntawm foaming. Raws li lub hauv paus ntsiab lus no, kev xaiv ntawm soft foam stabilizer yuav tsum xav txog:
① Kev ua ntawm ua npuas ncauj stabilizer
② Kev sib raug zoo ntawm kev khiav hauj lwm ntau ntawm cov npuas stabilizer thiab qhov ntau ntawm cov tin
③ Kev cuam tshuam ntawm ntau yam khoom siv raw uas tsim cov npuas stabilizer ntawm kev ua haujlwm ntau
Kev xaiv yuav tsum tau ua kom nruj ua npuas ncauj stabilizers
Rigid ua npuas ncauj muaj ib tug high degree ntawm cross-linking thiab yooj yim rau stabilize. Rigid ua npuas ncauj feem ntau yog siv rau molding cov khoom los yog foaming nyob rau hauv ib tug txwv txoj kab noj hniav, yog li lub fluidity ntawm cov khoom yog ib tug tseem ceeb heev txheej txheem parameter. Ua kom tsis muaj haujlwm thiab cuam tshuam rau kev ua haujlwm thermal rwb thaiv tsev. Yog li ntawd, thaum xaiv ib tug nruj npuas stabilizer, koj yuav tsum xav txog:
① Muaj peev xwm ua kom muaj zog emulsify cov khoom siv raw
②Nws muaj zog ntawm kev tswj qhov loj ntawm lub hlwb
③ Ua kom cov khoom muaj fluidity zoo dua thiab kev sib faib ntom ntom
Qhov sib txawv ntawm kev xaiv cov npuas npuas thiab mos ua npuas ncauj stabilizer
Ua npuas ncauj homogenizers tsis tsuas yog ua lub luag haujlwm ntawm homogenizing ua npuas ncauj, tab sis kuj cuam tshuam rau lub ntiajteb txawj nqus, elasticity thiab nro ntawm cov npuas dej. Ntau hom ua npuas ncauj stabilizers yuav tsum muaj rau cov khoom siv raw khoom sib txawv, cov kev siv sib txawv thiab cov foos sib txawv.
Cov ntaub ntawv raw uas xav tau rau cov yas foamed yas yog feem ntau muab rau hauv daim ntawv ntawm cov ntaub ntawv sib xyaw, yog li silicon-carbon stabilizers uas tsis yooj yim hydrolyzed feem ntau siv thaum lub sij hawm cia.
Nyob rau hauv lub siab-resilience ua npuas ncauj system, raw cov ntaub ntawv xws li polymer polyols yog siv, thiab muaj ntau yam khoom hais, yog li nws tsis tsim nyog siv ib tug general foam stabilizer tab sis tshwj xeeb ua npuas ncauj stabilizer.
Piv nrog rau ob, cov mos mos hom ua npuas ncauj stabilizer muaj cov ntsiab lus siab dua, thiab nws txoj kev lag luam feem ntau yog nyob ntawm cov tuam txhab txawv teb chaws.
Kev Lag Luam Yav Tom Ntej ntawm Foam Stabilizers
Kev sib txawv thiab kev ua haujlwm siab ntawm cov ntaub ntawv polyurethane yog sib cais los ntawm cov khoom ntxiv. Los ntawm qhov kev xav ntawm ntau npaum li cas, nplaim taws retardants yog thawj qhov chaw nyob rau hauv polyurethane ua npuas ncauj additives, ua npuas ncauj stabilizers (ua npuas ncauj stabilizers) coj qhov chaw thib ob, thiab polyurethane ua npuas ncauj plastics coj qhov chaw thib ob. Txoj kev loj hlob sai ntawm cov cuab yeej siv tshuab tau ua rau kev txhim kho ntawm cov npuas stabilizers.
Nrog rau txoj kev loj hlob ntawm polyurethane ua npuas ncauj kev lag luam nyob rau hauv cov kev taw qhia ntawm tsawg carbon, txuag hluav taws xob, kev tiv thaiv ib puag ncig thiab kev nyab xeeb, kev nruam kev tsim tshiab foaming raw cov ntaub ntawv thiab multi-performance foams, thiab yuav tsum tau rau tshiab ua npuas ncauj stabilizers kom phim lawv, yav tom ntej. ua npuas ncauj stabilizers yuav tshwj xeeb dua. Kev txhim kho thiab kev siv cov khoom zoo tshiab muaj ntau yam sib txawv.
