litaba

Polyolefin ke eng?

Polyolefin ke lelapa la polyethylene le polypropylene thermoplastics.Li hlahisoa haholo-holo ho tsoa ho oli le khase ea tlhaho ka mokhoa oa polymerization ea ethylene le propylene ka ho latellana.Ho feto-fetoha ha tsona ho entse hore e be e 'ngoe ea lipolasetiki tse tsebahalang tse sebelisoang kajeno.

Thepa ea polyolefin

Ho na le mefuta e mene ea polyolefin:

• LDPE (polyethylene e tlaase-tlaase): LDPE e hlalosoa ka mefuta e mengata ea 0.910-0.940 g/cm3.E khona ho mamella mocheso oa 80 °C ka ho tsoelang pele le 95 °C ka nako e khutšoanyane.E entsoe ka mefuta e feto-fetohang kapa ea opaque, e fetoha habonolo ebile e thata.
• LLDPE (linear low-density polyethylene): ke polyethylene e nang le mela e mengata, e nang le palo e kholo ea makala a makhutšoane, e atisang ho etsoa ke copolymerization ea ethylene e nang le li-olefin tse telele.LLDPE e na le matla a phahameng a ho tiea le tšusumetso e phahameng le ho hanyetsa ho phunya ho feta LDPE.E tenyetseha haholo 'me e lelefatsa tlas'a khatello ea maikutlo.E ka sebelisoa ho etsa lifilimi tse tšesaane ebile e na le khanyetso e ntle ea lik'hemik'hale.E na le lisebelisoa tse ntle tsa motlakase.Leha ho le joalo, ha ho bonolo ho sebetsa joalo ka LDPE.
• HDPE (polyethylene e phahameng-tlaase): HDPE e tsebahala ka tekanyo ea eona e kholo ea matla-to-density.Boima ba HDPE bo ka tloha ho 0.93 ho isa ho 0.97 g/cm3 kapa 970 kg/m3.Leha boima ba HDPE bo phahame hanyane ho feta ba polyethylene e tlase-tlase, HDPE e na le lekala le lenyenyane, e fanang ka matla a matla a intermolecular le matla a thata ho feta LDPE.E boetse e thata ho feta, 'me ha e bone hantle,' me e khona ho mamella mocheso o batlang o phahame (120 ° C ka nako e khutšoanyane).
• PP (polypropylene): Boima ba PP bo pakeng tsa 0.895 le 0.92 g/cm³.Ka hona, PP ke polasetiki ea thepa e nang le letsoalo le tlase haholo.Ha e bapisoa le polyethylene (PE) e na le lisebelisoa tse phahameng tsa mochine le ho hanyetsa mocheso, empa ho fokotseha ha lik'hemik'hale.PP hangata e thata ebile e tenyetseha, haholo ha e kopantsoe le ethylene.

Lisebelisoa tsa polyolefin

Litšobotsi tse ikhethileng tsa mefuta e fapaneng ea polyolefin li ikakhela ka setotsoana lits'ebetsong tse fapaneng, joalo ka:

• LDPE: filimi ea lijo-thollo, mekotla e tsamaisang thepa, filimi ea temo, liaparo tsa lebokose la lebese, ho roala ka mohala oa motlakase, mekotla e boima ea indasteri.
• LLDPE: filimi e otlolohileng, filimi ea ho kenya liindasteri, lijana tse nang le marako a tšesaane, le mekotla e boima, e mahareng le e menyenyane.
• HDPE: likhreiti le mabokose, libotlolo (bakeng sa lihlahisoa tsa lijo, litlolo, litlolo), lijana tsa lijo, lintho tsa ho bapala, litanka tsa peterole, liphutheloana tsa indasteri le filimi, liphaephe le lisebelisoa tsa ka tlung.
• PP: ho paka lijo, ho kenyeletsoa yoghurt, lipitsa tsa majarine, liphutheloana tse monate le tse bobebe, lijana tse sa keneng ka microwave, likhoele tsa k'hapete, fenishara ea jareteng, liphutheloana tsa bongaka le lisebelisoa, thōtō, lisebelisoa tsa kichineng le lipeipi.