Tshuab |Dab tsi yog qhov muaj feem cuam tshuam rau Cov Khoom ntawm Polyurethane Flexible Foam

Vim li cas thiaj muaj ntau hom kev hloov pauv ntawm polyurethane foams thiab ntau daim ntawv thov?Qhov no yog vim muaj ntau yam ntawm cov khoom siv raw, yog li cov khoom ntawm cov khoom siv tau yooj yim polyurethane foams ua kuj txawv.Tom qab ntawd, cov khoom siv raw siv rau cov khoom siv tau yooj yim polyurethane foams dab tsi cuam tshuam rau cov khoom tiav?

1. Polyether polyol

Raws li cov khoom siv tseem ceeb rau kev tsim cov khoom siv tau yooj yim polyurethane ua npuas ncauj, polyether polyol reacts nrog isocyanate los ua urethane, uas yog cov pob txha cov tshuaj tiv thaiv ntawm cov khoom ua npuas ncauj.Yog hais tias tus nqi ntawm polyether polyol yog nce, tus nqi ntawm lwm yam raw cov ntaub ntawv (isocyanate, dej thiab catalyst, thiab lwm yam) yog txo, uas yog ib qho yooj yim mus ua cracking los yog vau ntawm polyurethane saj zawg zog ua npuas ncauj khoom.Yog tias tus nqi ntawm polyether polyol raug txo, cov khoom siv tau yooj yim polyurethane ua npuas ncauj yuav nyuaj thiab elasticity yuav raug txo, thiab txhais tes yuav tsis zoo.

2. Foaming agent

Feem ntau, tsuas yog dej (tshwj xeeb foaming agent) yog siv los ua tus neeg sawv cev foaming hauv kev tsim cov polyurethane blocks nrog qhov ntom ntom ntau dua 21g / cm3, thiab cov ntsiab lus qis qis xws li methylene chloride (MC) yog siv rau hauv cov formulations tsawg lossis ultra. - soft formulations.Compounds (lub cev tshuab tshuab) ua haujlwm pab tshuab tshuab.

Raws li tus neeg sawv cev tshuab, dej reacts nrog isocyanate los tsim urea bonds thiab tso tawm ntau CO2 thiab cua sov.Cov tshuaj tiv thaiv no yog cov tshuaj tiv thaiv kab txuas ntxiv.Cov dej ntau dua, qhov ua npuas ncauj qis dua thiab muaj zog dua qhov hardness.Nyob rau tib lub sijhawm, cov ncej ntawm tes ua me thiab tsis muaj zog, uas txo cov kabmob muaj peev xwm, thiab nws yooj yim rau kev tawg thiab tawg.Tsis tas li ntawd, kev noj cov isocyanate nce, thiab cov cua sov tso tawm nce.Nws yog ib qho yooj yim ua rau cov tub ntxhais hlawv.Yog hais tias cov dej ntau tshaj 5.0 feem, yuav tsum tau ntxiv ib tug foaming tus neeg sawv cev los nqus ib feem ntawm lub tshav kub thiab tsis txhob core burning.Thaum tus nqi ntawm cov dej raug txo, tus nqi ntawm cov catalyst raug txo qis, tab sis qhov ceev ntawm cov tau hloov pauv polyurethane ua npuas ncauj yog nce.

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Tus neeg saib xyuas tshuab tshuab yuav txo qhov ntom thiab hardness ntawm polyurethane hloov tau ua npuas ncauj.Txij li thaum tus neeg sawv cev pab tshuab nqus ib feem ntawm cov tshuaj tiv thaiv thaum lub sij hawm gasification, tus nqi kho tau qeeb, yog li nws yog ib qho tsim nyog yuav tsum tsim kom muaj cov catalyst kom tsim nyog;nyob rau tib lub sijhawm, vim tias qhov gasification absorbs ib feem ntawm lub tshav kub, qhov kev nyab xeeb ntawm cov tub ntxhais hlawv yog zam.

3. Toluene diisocyanate

Polyurethane flexible ua npuas ncauj feem ntau xaiv T80, uas yog, sib tov ntawm ob isomers ntawm 2,4-TDI thiab 2,6-TDI nrog ib tug ratio ntawm (80 ± 2)% thiab (20 ± 2)%.

Thaum lub isocyanate Performance index siab dhau lawm, qhov saum npoo yuav nplaum rau lub sijhawm ntev, qhov kev hloov pauv ntawm lub cev ua npuas ncauj yuav nce, cov qauv ua npuas dej yuav ntxhib, lub xov tooj kaw yuav nce, tus nqi rov qab yuav txo qis, thiab qee zaum. cov khoom yuav tawg.

Yog tias qhov ntsuas isocyanate tsawg dhau, lub zog txhua yam thiab qhov ua kom muaj zog ntawm cov npuas dej yuav raug txo, kom cov npuas dej ua rau cov kab nrib pleb zoo, uas yuav ua rau qhov teeb meem tsis zoo ntawm cov txheej txheem foaming;Tsis tas li ntawd, yog tias cov isocyanate index tsawg dhau lawm, nws tseem yuav ua rau cov txheej txheem compression ntawm polyurethane ua npuas ncauj loj dua, thiab qhov chaw ntawm cov npuas dej yog nquag ntub.

4. Catalyst

1. Tertiary amine catalyst: A33 (triethylenediamine tov nrog ib feem ntawm 33%) feem ntau yog siv, thiab nws txoj haujlwm yog los txhawb cov tshuaj tiv thaiv ntawm isocyanate thiab dej, kho qhov ntom ntawm cov npuas dej thiab qhov qhib ntawm npuas, thiab lwm yam. ., feem ntau los txhawb cov tshuaj tiv thaiv foaming.

Yog hais tias tus nqi ntawm tertiary amine catalyst ntau dhau lawm, nws yuav ua rau cov khoom ua npuas ncauj polyurethane sib cais, thiab yuav muaj qhov pores lossis npuas hauv npuas;Yog hais tias tus nqi ntawm tertiary amine catalyst tsawg dhau, qhov tshwm sim polyurethane ua npuas ncauj yuav ntsws, kaw hlwb, thiab yuav ua rau cov khoom ua npuas ncauj hauv qab tuab.

2. Organometallic catalyst: T-9 feem ntau yog siv los ua organotin octoate catalyst;T-9 yog gel cov tshuaj tiv thaiv catalyst nrog kev ua haujlwm siab catalytic, thiab nws lub luag haujlwm tseem ceeb yog los txhawb cov tshuaj tiv thaiv gel, uas yog, cov tshuaj tiv thaiv tom qab.

Yog hais tias tus nqi ntawm organotin catalyst yog tsim nyog, yuav tau txais ib tug zoo qhib cell polyurethane ua npuas ncauj.Ntxiv rau qhov nce ntawm cov organotin catalyst yuav ua rau cov npuas dej maj mam tighter, ua rau shrinkage thiab kaw hlwb.

Txo tus nqi ntawm tertiary amine catalyst los yog nce tus nqi ntawm organotin catalyst yuav ua rau kom lub zog ntawm lub polymer npuas zaj duab xis phab ntsa thaum ib tug loj npaum li cas ntawm cov roj yog generated, yog li txo qhov tshwm sim ntawm hollowing los yog tawg.

Txawm hais tias polyurethane ua npuas ncauj muaj qhov zoo tshaj plaws qhib-cell lossis kaw-cell qauv feem ntau yog nyob ntawm seb cov gel cov tshuaj tiv thaiv ceev thiab cov pa nthuav dav nrawm yog sib npaug thaum tsim cov polyurethane ua npuas ncauj.Qhov kev tshuav no tuaj yeem ua tiav los ntawm kev kho hom thiab tus nqi ntawm tertiary amine catalyst catalyst thiab ua npuas ncauj stabilization thiab lwm yam kev pabcuam hauv kev tsim.

Tshaj Tawm: Cov kab lus no tau hais los ntawmhttps://mp.weixin.qq.com/s/JYKOaDmRNAXZEr1mO5rrPQ (txuas txuas).Tsuas yog rau kev sib txuas lus thiab kev kawm, tsis txhob ua lwm yam kev lag luam lub hom phiaj, tsis sawv cev rau lub tuam txhab kev pom thiab kev xav, yog tias koj xav tau rov luam dua, thov hu rau tus thawj sau, yog tias muaj kev ua txhaum cai, thov hu rau peb tam sim ntawd kom tshem tawm cov txheej txheem.