Polyol thiab isocyanate ratio:

Polyol muaj ib tug high hydroxyl tus nqi thiab ib tug loj molecular hnyav, uas yuav ua rau kom lub crosslinking ceev thiab pab txhim kho cov npuas dej ceev. Kho qhov isocyanate Performance index, uas yog, molar piv ntawm isocyanate rau nquag hydrogen nyob rau hauv polyol, yuav ua rau kom cov degree ntawm crosslinking thiab nce qhov ceev. Feem ntau, isocyanate index yog nruab nrab ntawm 1.0-1.2.

 

Kev xaiv thiab ntau npaum li cas ntawm foaming agent:

Hom thiab ntau npaum li cas ntawm tus neeg sawv cev foaming ncaj qha cuam tshuam rau huab cua nthuav dav thiab npuas ntom tom qab foaming, thiab tom qab ntawd cuam tshuam rau lub thickness ntawm lub crust. Txo qhov ntau npaum li cas ntawm lub cev foaming tus neeg sawv cev tuaj yeem txo qhov porosity ntawm cov npuas dej thiab ua kom qhov ntom ntom. Piv txwv li, dej, raws li ib tug tshuaj foaming neeg sawv cev, reacts nrog isocyanate los tsim carbon dioxide. Ua kom cov dej ntau ntxiv yuav txo cov npuas ntom ntom, thiab nws cov nyiaj ntxiv yuav tsum tau tswj nruj me ntsis.

 

Tus nqi ntawm catalyst:

Lub catalyst yuav tsum xyuas kom meej tias cov tshuaj tiv thaiv foaming thiab cov tshuaj tiv thaiv gel hauv cov txheej txheem foaming ncav cuag qhov sib npaug dynamic, txwv tsis pub cov npuas vau lossis shrinkage yuav tshwm sim. Los ntawm kev sib xyaw ua ke muaj zog alkaline tertiary amine compound uas muaj cov nyhuv catalytic muaj zog ntawm cov tshuaj tiv thaiv foaming thiab muaj zog catalytic nyhuv ntawm cov tshuaj tiv thaiv gel, lub catalyst haum rau tus kheej-skinning system tuaj yeem tau txais.

 

Kev tswj qhov kub thiab txias:

Pwm kub: Lub thickness ntawm daim tawv nqaij yuav nce raws li pwm kub txo. Ua kom cov pwm kub yuav ua rau cov tshuaj tiv thaiv kom nrawm dua, uas yog qhov tsim nyog rau kev tsim cov qauv denser, yog li ua kom qhov ntom ntom, tab sis kub dhau heev yuav ua rau cov tshuaj tiv thaiv tawm ntawm kev tswj. Feem ntau, pwm kub yog tswj ntawm 40-80 ℃.

 

Ripening kub:

Kev tswj qhov kub ntawm kev laus mus rau 30-60 ℃ thiab lub sijhawm rau 30s-7min tuaj yeem tau txais qhov sib npaug zoo ntawm lub zog demoulding thiab kev ua haujlwm ntawm cov khoom.

 

Kev tswj siab:

Kev nce siab thaum lub sijhawm ua npuas dej tuaj yeem cuam tshuam qhov nthuav dav ntawm cov npuas, ua rau cov qauv ua npuas ncauj ntau dua, thiab ua kom qhov ntom ntom. Txawm li cas los xij, kev kub siab ntau dhau yuav ua rau cov kev xav tau ntawm pwm thiab ua rau tus nqi nce.

 

stirring ceev:

Kev ua kom nrawm nrawm tuaj yeem ua rau cov khoom siv raw sib xyaw kom sib npaug, hnov ​​​​mob ntau dua, thiab pab ua kom qhov ntom ntom. Txawm li cas los xij, qhov nrawm nrawm nrawm heev yuav ua kom pom huab cua ntau dhau, ua rau txo qhov ceev, thiab feem ntau tswj tau ntawm 1000-5000 rpm.

 

Overfilling coefficient:

Tus nqi txhaj tshuaj ntawm cov tshuaj tiv thaiv sib xyaw ntawm cov khoom siv tawv nqaij ntawm tus kheej yuav tsum ntau dua li qhov kev txhaj tshuaj ntawm cov foaming dawb. Nyob ntawm cov khoom siv thiab cov khoom siv, cov coefficient overfilling feem ntau yog 50% -100% kom muaj pwm siab, uas yog qhov zoo rau cov liquefaction ntawm tus neeg sawv cev foaming nyob rau hauv daim tawv nqaij txheej.

 

Lub sijhawm ntawm daim tawv nqaij leveling:

Tom qab cov foamed polyurethane yog nchuav rau hauv cov qauv, qhov ntev ntawm qhov chaw yog leveled, lub thicker ntawm daim tawv nqaij. Tsim nyog tswj lub sij hawm theem tom qab pouring kuj yog ib qho ntawm txoj kev los tswj cov thickness ntawm daim tawv nqaij.