2024 Tus sau: Beatrice Philips | [email protected]. Kawg hloov kho: 2023-12-16 05:41
Polyethylene yog tsim los ntawm cov pa roj av - hauv cov xwm txheej ib txwm muaj - ethylene. PE tau pom daim ntawv thov hauv kev tsim cov yas thiab cov khoom siv hluavtaws. Nws yog cov khoom siv tseem ceeb rau cov yeeb yaj kiab, kav dej thiab lwm yam khoom lag luam uas tsis xav tau cov hlau thiab ntoo - polyethylene yuav hloov pauv tau zoo.
Nws vam khom dab tsi thiab nws cuam tshuam dab tsi?
Cov kev ceev ntawm polyethylene nyob rau tus nqi ntawm tsim ntawm crystal lattice molecules nyob rau hauv nws cov qauv. Nyob ntawm tus txheej txheem ntawm kev tsim khoom, thaum cov tshuaj yaj yeeb yaj kiab, tsim tawm tshiab los ntawm cov pa roj carbon ethylene, tau txias, cov polymer molecules kab sib txheeb txheeb ze rau ib leeg hauv ib ntu . Amorphous qhov khoob tau tsim los ntawm kev tsim cov polyethylene muaju. Nrog rau qhov ntev ntawm cov molecule luv thiab txo qis ntawm nws cov ceg ntoo, txo qhov ntev ntawm cov ceg ntoo txuas, polyethylene crystallization tau ua tiav nrog qhov zoo tshaj plaws.
High crystallization txhais tau hais tias ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom polyethylene.
Qhov ceev yog dab tsi?
Nyob ntawm tus txheej txheem ntawm kev tsim khoom, polyethylene tau tsim tawm hauv qhov qis, nruab nrab thiab siab. Qhov thib ob ntawm cov ntaub ntawv no tsis tau txais koob meej ntau vim yog tus yam ntxwv uas nyob deb ntawm qhov xav tau qhov tseem ceeb.
Tsawg
Txo qhov ntom ntom PE yog cov qauv uas nws cov lwg me me muaj ntau sab ceg. Qhov ntom ntawm cov khoom yog 916 … 935 kg ib m3. Cov khoom siv thauj khoom siv uas siv cov olefin yooj yim tshaj plaws, ethylene, raws li cov khoom siv raw, yuav tsum muaj lub siab ntawm tsawg kawg ib txhiab atmospheres thiab qhov kub ntawm 100 … 300 ° C. Nws lub npe thib ob yog PE siab. Tsis muaj ntau lawm - kev siv hluav taws xob siab kom tswj tau qhov siab ntawm 100 … 300 megapascals (1 atm = 101325 Pa).
Siab
PE ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntaws PE ntau dua Qhov ntom ntawm cov khoom siv no nce mus txog 960 kg / m3 . Yuav tsum tau xaj kom muaj qhov siab dua qhov siab - 0, 2 … 100 atm., Cov tshuaj tiv thaiv tshwm sim thaum muaj cov tshuaj tiv thaiv kab mob organometallic.
Polyethylene twg los xaiv?
Tom qab ob peb xyoos, cov khoom no pom tsis zoo nyob hauv qhov cuam tshuam ntawm tshav kub thiab ultraviolet hluav taws xob hauv qhov qhib cua. Qhov kub warpage siab tshaj 90 ° C. Hauv cov dej npau, nws muag thiab poob nws cov qauv, thim thiab ua thinner hauv qhov chaw uas nws nthuav. Tiv taus rau caum-degree te.
Rau kev tiv thaiv dej, raws li GOST 10354-82, PE ntom ntom tau raug coj los, muaj cov organic ntxiv . Raws li GOST 16338-85, cov khoom siv polymer uas siv rau kev tiv thaiv dej tau muaj kev ruaj ntseg thev naus laus zis (cim nrog tsab ntawv T hauv qhov kev xaiv) thiab tsis ntau tshaj li ib nrab hli tuab. Cov khoom siv tiv thaiv dej yog tsim nyob rau hauv daim ntawv ntawm ib txheej web hauv yob thiab (ib nrab) tes tsho. Cov dej tsis tuaj yeem tiv taus te txog li 50 degrees thiab cua sov mus txog 60 degrees - vim tias nws yog tuab thiab tuab.
Cov zaub mov qhwv thiab lub raj mis yas yog tsim los ntawm cov polymer sib txawv me ntsis - polyethylene terephthalate . Lawv muaj kev nyab xeeb rau tib neeg kev noj qab haus huv. Feem ntau hom thiab ntau yam ntawm PE yog ib puag ncig tus phooj ywg thiab yooj yim rau txheej txheem.
Lub polymer nws tus kheej kub hnyiab nrog tsim cov kab ntawm cov hmoov tshauv, nthuav tawm qhov tsis hnov tsw ntawm cov ntawv hlawv. Cov PE uas tsis rov ua dua tau raug hlawv kom nyab xeeb thiab muaj txiaj ntsig zoo hauv lub qhov cub pyrolysis, ua kom muaj cua sov ntau dua li cov ntoo nruab nrab.
Cov khoom siv, ua pob tshab, tau pom daim ntawv thov ua cov plexiglass nyias tiv taus rau qhov cuam tshuam cuam tshuam rau txhawm rau txhawm rau txhawm rau iav zoo tib yam. Qee cov kws tshaj lij siv cov phab ntsa yas fwj ua pob tshab thiab khov iav . Ob zaj duab xis thiab tuab-walled PE nquag khawb sai, vim qhov uas cov ntaub ntawv poob sai sai nws cov pob tshab.
PE tsis raug rhuav tshem los ntawm cov kab mob - tau ntau caum xyoo . Qhov no ua kom ntseeg tau tias lub hauv paus raug tiv thaiv los ntawm cov dej hauv av. Lub pob zeb nws tus kheej tuaj yeem, tom qab nchuav, ua kom tawv tawv hauv 7-25 hnub, tsis tas tso cov dej muaj rau hauv cov av uas tau qhuav dhau thaum lub caij ntuj qhuav.
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