Expandable polystyrene (EPS), tseem hu ua expandable polystyrene, yog polystyrene resin nrog ib tug me me txheeb ze ntom ntom (1.05g / cm3), uas tsis muaj thermal conductivity, thiab tsis tshua muaj dej nqus. Nws muaj qhov zoo ntawm kev ua haujlwm siab, tsis tshua muaj kev cuam tshuam, hluav taws xob rwb thaiv tsev, suab rwb thaiv tsev, noo noo tsis kam, kev co kuj, zoo dielectric zog, thiab lwm yam. Nrog rau txoj kev loj hlob sai ntawm kev lag luam thoob ntiaj teb, kev noj ntawm Styrofoam kuj nce ntxiv.
Cov ntaub ntawv pov tseg polystyrene ua npuas dej no yog qhov me me, lub teeb hauv qhov hnyav, tiv thaiv kev laus thiab tsis yooj yim rau corrode. Nws yog ib qho teeb meem loj hauv kev pov tseg. Nyob rau hauv xyoo tas los no, kev rov ua dua tshiab ntawm foamed polystyrene tau dhau los ua ib qho ntawm kev tsom mus rau kev lag luam. .
Kev npaj:
Muaj ob txoj hauv kev los npaj EPS cov khoom:
1. Ib kauj ruam dipping txheej txheem (los yog hu ua one-step method). Ua ntej ntxiv styrene monomer, foaming agent, dispersing agent, dej, foaming agent (feem ntau pentane thiab butane) thiab lwm yam auxiliary agents rau hauv cov tshuaj tiv thaiv kettle, thiab polymerize kom tau resin particles uas muaj foaming agent, ces ntxuav, Centrifugal sib cais thiab ziab kom tau polystyrene. hais nrog zoo foaming zog;
2. Ob-kauj ruam impregnation txheej txheem, hu ua ob-kauj ruam txoj kev, yog kom polymerize styrene monomer rau hauv polystyrene hlaws ntawm ib tug me me particle loj nyob rau hauv ib tug tshuaj tiv thaiv kettle, cais thiab sieve, thiab ces ntxiv dej, emulsifier thiab foaming neeg sawv cev. Thiab lwm yam additives, rhuab thiab impregnated nyob rau hauv cov tshuaj tiv thaiv kettle los tsim ib tug expandable polystyrene hlaws khoom. Cov txheej txheem muaj qhov zoo ntawm cov txheej txheem yooj yim, kev nqis peev tsawg, kev txuag hluav taws xob zoo dua li ob txoj hauv kev, thiab cov txiaj ntsig zoo txuag hluav taws xob. Nyob rau hauv txawv teb chaws, cov txheej txheem ntawm expandable polystyrene tsuas yog siv txoj kev ncua kev kawm ntawv.
Moulding:
Kuj tseem muaj ob txoj hauv kev molding tseem ceeb rau EPS:
1. Extrusion txoj kev, uas yog, ncaj qha kub extrusion tom qab foaming ntawm EPS hais, uas yog feem ntau siv los tsim cov nplooj ntawv thiab zaj duab xis;
2. Molding txoj kev: Ua ntej, ua ntej nthuav cov EPS hais los ntawm 30 ~ 50 zaug nrog 100 degree huab cua (los yog dej vapor), ces cia lawv mature rau 24 teev, thiab ces muab cov mature hais rau hauv txhuas los yog cam khwb cia rau hauv pwm, Tom qab cua sov los ntawm huab cua (lossis dej vapor) ntawm 115 ~ 120 degree, qhov chaw ntawm cov khoom sib txuas nrog ib leeg thaum cov khoom nthuav tawm los ua ib qho ua npuas ncauj, thiab lub zog cua sov ua rau cov khoom sib txuas ua ib qho ua npuas ncauj.
EPS cov khoom feem ntau muaj kev nyab xeeb thiab tsis muaj tshuaj lom, tab sis cov khoom siv raw yog nyob rau hauv ntau lub xeev thaum ua, thiab muaj qee yam kev pheej hmoo. Ua pa thiab tawv nqaij tuaj yeem ua rau khaus los ntawm polystyrene hmoov. Khaws EPS pellets tso tawm pentane vapor, ib qho roj uas kub hnyiab tau yooj yim heev thiab tsim cov khoom tawg nrog huab cua. Thaum rhuab, polystyrene polymers tso tawm styrene monomer, uas yog ib yam khoom txaus ntshai.