(Lub foaming siab yog ib qho tseem ceeb parameter nyob rau hauv cam khwb cia ua npuas ncauj molding (PUR). Nws tau raug txiav txim siab tias qhov foaming siab sib txawv nrog lub sijhawm thaum lub sij hawm casting thiab foaming ntawm nruj polyurethane ua npuas ncauj. Tom qab cov khoom siv tshuaj tiv thaiv raug txhaj, lub siab nce maj mam nce mus txog nws qhov txiaj ntsig siab tshaj plaws thiab tom qab ntawd maj mam txo qis.
A. Foaming siab yog cuam tshuam los ntawm ntau yam
Cov yam ntxwv no yog: polyol's functionality, hydroxyl tus nqi thiab molecular qauv, isocyanate hom, catalyst hom thiab ntau npaum li cas, foaming agent hom thiab ntau npaum, raw khoom kub, pwm kub, khoom loj thiab casting sij hawm, thiab lwm yam.
Hauv lwm cov xwm txheej feem ntau yog tib yam, feem ntau hais lus, kev siv cov tshuaj tsw qab polyether polyol formula foaming siab dua li kev siv sorbitol polyether thiab lwm yam aliphatic polyether rau siab; polyol hydroxyl tus nqi sib npaug, kev ua haujlwm siab ntawm cov khoom siv raw foaming siab dua; catalyst ntau npaum li cas, foaming siab kuj nce nrog.
B. Pwm qhov kub thiab txias muaj qhov cuam tshuam tseem ceeb ntawm foaming siab
Tsawg pwm kub ua rau cov foaming tsis tshua muaj siab thiab conversely high pressures. Kev cuam tshuam ntawm pwm kub ntawm foaming siab thiab cov khoom nto khoom
C. Piv txwv ntawm lub ncuav mog qab zib molding formulation
Cov tshuaj formulation yog txiav txim siab los ntawm kev ua tau zoo ntawm cov khoom. Raws li nruj polyurethane ua npuas ncauj muaj ntau yam kev siv thiab siv nrog ntau yam kev ua tau zoo, nws yog ib qho nyuaj rau siv ib los yog ntau yam tshuaj formulations kom tau raws li qhov xav tau ntawm ntau daim ntawv thov.
