Cov yam tseem ceeb uas cuam tshuam rau qhov resilience ntawm polyurethane flexible foam yog raws li nram no:
a. Cell qhib piv. Thaum qhib tus nqi ntawm cov khoom yog siab, feem ntau ntawm cov polymers yog tusyees faib nyob rau hauv lub ntuj qhib-cell ua npuas ncauj meridians, yog li cov resilience ntawm cov khoom yog ntau dua; Nrog ntau incompressibility, yog li ntawd, lub resilience ntawm cov khoom txo. Yog li ntawd, tus nqi ntawm foaming tus neeg sawv cev tuaj yeem tsim nyog nce ntxiv, thiab qhov nyuaj ntawm cov phab ntsa ntawm tes rupture tuaj yeem yog nruab nrab los ntawm kev kho qhov nro ntawm phab ntsa ntawm tes, yog li ua rau qhov qhib ntawm tes sib piv ntawm polyurethane ua npuas ncauj.
b. Cell puab. Thaum lub cell zoo li qub nce, qhov resilience ntawm polyurethane ua npuas ncauj nce, thiab polyurethane ua npuas ncauj nrog ib tug kheej kheej cell qauv muaj zoo resilience. Polyurethane foams nrog rab koob zoo li cov qauv ntawm tes yog qhov ua rau ntawm tes tawg. Yog li ntawd, qhov kub ntawm foaming tuaj yeem txo qis kom tsim nyog los tiv thaiv cov hlwb los ntawm kev nyem thiab deformed vim kev nthuav dav heev.
c. Cell pore loj thiab nws qhov kev faib tawm. Nyob rau hauv tib lub cev, ib tug ua npuas ncauj nrog ib tug loj feem ntawm lub hlwb me me yuav muaj ib tug loj rebound tus nqi. Tab sis qhov pore loj ntawm lub xov tooj ntawm tes tsis yog me me li qhov ua tau, tab sis muaj qhov zoo tshaj plaws tus nqi. Tsis tas li ntawd, tus nqi rov qab ntawm cov khoom ua npuas ncauj nce ntxiv nrog qhov nce ntawm cov xov tooj ntawm tes, thiab tsuas yog thaum lub xov tooj ntawm tes pore loj yog qhov tsim nyog faib tau qhov siab tshaj plaws ntawm tes tau txais. Yog li ntawd, cell stabilizer tuaj yeem muab ntxiv rau qhov tsim nyog.
d. Polyether polyols. Nyob rau hauv ib qho kev sib txawv, qhov loj dua qhov hnyav ntawm tus txheeb ze molecular ntawm polyether polyol, qhov zoo dua qhov yooj ntawm cov saw molecular thiab qhov zoo dua qhov resilience, thiab dhau qhov ntau, qhov hardness ntawm cov npuas yuav txo. Txawm li cas los xij, thaum siv polyether polyols nrog qhov hnyav molecular hnyav, kev ntsuas yuav tsum tau coj los txo lawv cov degradation. Xws li ntxiv qhov tsim nyog ntawm cov tshuaj antioxidants ua ntej cov tshuaj tiv thaiv polymerization.
e. Isocyanates. Nyob rau hauv cov mis, nws yog ib qho tsim nyog yuav tau xyuam xim rau kev tswj cov isocyanate Performance index, uas yog, TDI Performance index. TDI index yog hais txog qhov sib piv ntawm tus nqi tiag tiag ntawm TDI rau tus lej suav. Lub hardness ntawm cov npuas yuav yooj yim thiab nyab xeeb tswj nyob rau hauv qhov ntau ntawm TDI Performance index 105 ~ 115. Nyob rau hauv ib tug tej yam ntau yam, nrog rau qhov nce ntawm TDI Performance index, hardness thiab resilience ntawm cov npuas nce. Yog li ntawd, TDI index tuaj yeem tsim nyog nce.
f. Lwm yam. Nrog rau qhov nce ntawm huab hwm coj piv ntawm dej rau polyol, qhov resilience ntawm cov npuas dej nce ua ntej thiab tom qab ntawd txo qis. Yog li ntawd, tus nqi ntawm cov dej ntxiv tuaj yeem hloov kho kom muaj kev ua haujlwm siab. Raws li qhov loj piv ntawm cov saw txuas mus rau polyol nce, lub zog tensile ntawm cov khoom nce thiab cov resilience txo. Yog li ntawd, cov saw extender tuaj yeem raug txo kom tsim nyog.
