Plastiki ea PVC e entsoe ka khase ea acetylene le hydrogen chloride, ebe e etsoa polymerized.Mathoasong a lilemo tsa bo-1950, e ne e hlahisoa ka mokhoa oa acetylene carbide, 'me ho elella bofelong ba lilemo tsa bo-1950, e fetohile mokhoa oa ethylene oxidation o nang le lisebelisoa tse lekaneng tse tala le theko e tlaase;Hona joale, ho feta 80% ea li-resin tsa PVC lefatšeng li hlahisoa ka mokhoa ona.Leha ho le joalo, ka mor'a 2003, ka lebaka la theko ea oli e ntseng e phahama, litšenyehelo tsa mokhoa oa acetylene carbide li ne li le ka tlase ho 10% ho feta mokhoa oa ethylene oxidation, kahoo mokhoa oa ho kopanya oa PVC o fetohile mokhoa oa acetylene carbide.
PVC polasetiki e entsoe ka polymerized ke liquid vinyl chloride monomer (VCM) ka ho fanyeha, lotion, bongata kapa tharollo ea tharollo.Ts'ebetso ea ho emisa polymerization e bile mokhoa o ka sehloohong oa ho hlahisa resin ea PVC e nang le ts'ebetso ea tlhahiso e holileng, ts'ebetso e bonolo, theko e tlase ea tlhahiso, mefuta e mengata ea lihlahisoa le mefuta e mengata ea ts'ebeliso.E nka karolo ea 90% ea limela tsa lefats'e tsa tlhahiso ea PVC (homopolymer e boetse e etsa karolo ea 90% ea kakaretso ea PVC ea lefats'e).Ea bobeli ke mokhoa oa lotion, o sebelisetsoang ho hlahisa PVC peista resin.Karabelo ea polymerization e qalisoa ke li-radicals tsa mahala, 'me mocheso oa karabelo hangata ke 40 ~ 70oc.Mocheso oa karabelo le mohopolo oa initiator li na le tšusumetso e kholo ho sekhahla sa polymerization le kabo ea boima ba limolek'hule tsa resin ea PVC.
Mena khetho ea recipe
Foromo ea profil ea polasetiki ea PVC haholo-holo e entsoe ka resin ea PVC le li-additives, tse arotsoeng ka: stabilizer ea mocheso, lubricant, modifier ea ho sebetsa, mofetoleli oa phello, filler, anti-aging agent, colorant, joalo-joalo Pele re theha foromo ea PVC, re lokela ho qala ka utloisisa ts'ebetso ea resin ea PVC le li-additives tse fapaneng.
1. Resin e tla ba pvc-sc5 resin kapa pvc-sg4 resin, ke hore, resin ea PVC e nang le tekanyo ea polymerization ea 1200-1000.
2. Sistimi ea botsitso ba mocheso e tlameha ho eketsoa.Khetha ho ea ka litlhoko tsa sebele tsa tlhahiso, 'me u ele hloko phello ea synergistic le phello e hanyetsanang pakeng tsa li-stabilizer tsa mocheso.
3. Phetoho ea phello e tlameha ho eketsoa.Liphetoho tse amang CPE le ACR li ka khethoa.Ho ea ka likarolo tse ling ka foromo le matla a polasetiki a extruder, palo ea tlatsetso ke likarolo tse 8-12.CPE e na le theko e tlase le mefuta e mengata ea mehloli;ACR e na le khanyetso e phahameng ea botsofali le matla a fillet.
4. Kenya chelete e lekaneng tsamaisong ea lubrication.Sistimi ea lubrication e ka fokotsa mojaro oa mochini o lokisang le ho etsa hore sehlahisoa se boreleli, empa ho fetella ho tla etsa hore matla a weld fillet a fokotsehe.
5. Ho eketsa mofetoleli oa ho sebetsa ho ka ntlafatsa boleng ba polasetiki le ho ntlafatsa ponahalo ea lihlahisoa.Ka kakaretso, ACR processing modifier e eketsoa ka bongata ba likarolo tse 1-2.
6. Ho eketsa li-filler ho ka fokotsa litšenyehelo le ho eketsa ho tiea ha profil, empa ho na le tšusumetso e kholo ho matla a tšusumetso ea mocheso o tlase.Reactive light calcium carbonate e nang le fineness e phahameng e lokela ho eketsoa, ka kakaretso ea likarolo tse 5-15.
7. Tekanyo e itseng ea titanium dioxide e tlameha ho eketsoa ho sireletsa mahlaseli a kotsi.Titanium dioxide e lokela ho ba mofuta oa rutile, ka kakaretso ea likarolo tse 4-6.Haeba ho hlokahala, li-absorber tsa ultraviolet UV-531, uv327, joalo-joalo li ka eketsoa ho eketsa khanyetso ea botsofali ea profil.
8. Ho eketsa khanya e putsoa le ea fluorescent ka tekanyo e nepahetseng ho ka ntlafatsa haholo 'mala oa profil.
9. Foromo e lokela ho nolofatsoa ka hohle kamoo ho ka khonehang, 'me li-additives tsa metsi ha lia lokela ho kenngoa ka hohle kamoo ho ka khonehang.Ho ea ka litlhoko tsa ts'ebetso ea ho kopanya (bona bothata ba ho kopanya), foromo e lokela ho aroloa ka boitsebiso ba I, boitsebiso ba II le boitsebiso ba III ka lihlopha ho ea ka tatellano ea ho fepa, 'me e phuthetsoe ka ho latellana.
Ho phutha ho emisoa ha polymerization
Suspension polymerization e boloka marotholi a 'mele a le mong a emisitsoe ka metsing ka ho sisinyeha ho tsoelang pele,' me karabelo ea polymerization e etsoa ka marotholi a manyane a monomer.Hangata, polymerization ea ho emisoa ke polymerization ea nakoana.
Lilemong tsa morao tjena, lik'hamphani li 'nile tsa tsoela pele ho ithuta le ho ntlafatsa foromo, polymerizer, mefuta e fapaneng ea lihlahisoa le boleng ba mokhoa oa ho emisa polymerization oa PVC resin, le ho ntlafatsa mekhoa ea theknoloji e nang le litšobotsi tsa eona.Hajoale, theknoloji ea khamphani ea Geon (eo pele e neng e le BF Goodrich company), thekenoloji ea k'hamphani ea shinyue Japane le theknoloji ea k'hamphani ea EVC Europe li sebelisoa haholo.Theknoloji ea lik'hamphani tsena tse tharo e etsa karolo ea 21% ea matla a macha a lefats'e a tlhahiso ea PVC ho tloha ka 1990.
Nako ea poso: Jul-15-2022