Li-fitting tsa liphaephe tsa PVC (Polyvinyl Chloride) li fumaneha hohle meralong ea motheo ea sejoale-joale, li akaretsa liphaephe, liphaephe tsa metsi, phepelo ea metsi le lipalangoang tsa mokelikeli oa indasteri. Botumo ba tsona bo bakoa ke melemo ea tlhaho: ho hanyetsa lik'hemik'hale, ho boloka litšenyehelo hantle, le ho tiea ha sebopeho. Leha ho le joalo, sebopeho sa limolek'hule tsa PVC—se khetholloang ka li-unit tsa vinyl chloride tse pheta-phetoang—se etsa hore e be kotsing ea ho senyeha tlas'a khatello ea mocheso, oxidative le UV. Mona ke mooLi-stabilizer tsa PVCli bapala karolo ea bohlokoa: li fokotsa ho senyeha, li netefatsa hore li-fitting tsa liphaephe li boloka botšepehi ba mechini le ts'ebetso nakong ea bophelo ba tsona ba ts'ebeletso. Ka tlase ke tlhahlobo e qaqileng ea lits'ebetso tsa tsona, mekhoa le litekanyetso tsa khetho lits'ebetsong tsa liphaephe tsa PVC.
1. HobanengEtsa PVCLisebelisoa tsa Liphaephe li Hloka Li-Stabilizer
PVC e senyeha ka mokhoa o ke keng oa fetoloa ha e pepesetsoa mocheso o phahameng (o tloaelehileng lits'ebetsong tsa ho ntša kapa ho enta ka ente) kapa khatello ea tikoloho e telele (mohlala, khanya ea letsatsi, mongobo, kapa ho pepesehela lik'hemik'hale). Tsela ea mantlha ea ho senyeha ke ho tlosoa ha chlorine: mocheso kapa matla a UV a roba maqhama a fokolang a C-Cl, a lokolla hydrochloric acid (HCl) le ho qala karabelo ea ketane e lebisang ho khaolong ea ketane ea polymer. Sena se iponahatsa e le:
• Ho fetoha ha mmala (ho ba mosehla kapa ho ba sootho)
• Tahlehelo ea matla a ho thulana le ho tenyetseha
• Ho petsoha kapa ho qhibiliha, ho sitisa ho dutla ha metsi
• Tšilafalo ea maro a tsamaisoang (a bohlokoa haholo lits'ebetsong tsa metsi a nooang)
Li-stabilizer li sitisa ts'ebetso ena, li etsa hore e be tsa bohlokoa haholo tlhahisong ea liphaephe tsa PVC.
2. Mekhoa ea Li-Stabilizer tsa PVC ho Li-Fittings tsa Liphaephe
Li-stabilizer li sebetsa ka mekhoa e mengata ea tšebelisano-'moho ho sireletsa PVC:
•Ho Senya HCl:Tlosa hydrochloric acid e ntšitsoeng 'meleng, e thibele ho baka ho senyeha ho hoholo ha eona.
•Thibelo e sa Feleng ea Mahlaseli a Maholo:Qetella liketso tsa ketane tse qalisoang ke mocheso kapa li-free radical tse hlahisoang ke UV.
•Ho amohuoa ha li-ion tsa tšepe:Tlama litšila tsa tšepe tse sa reng letho (mohlala, tšepe, koporo) tse potlakisang ho senyeha.
•UVTšireletso:Khantša kapa monya mahlaseli a UV, a bohlokoa bakeng sa ts'ebeliso ea liphaephe tsa kantle (mohlala, ho ntša metsi ka holim'a mobu).
•Thuso ea ho tlotsa:Li-stabilizer tse ling (mohlala, li-UV stabilizers), calcium stearate li fokotsa khohlano nakong ea ts'ebetso, li thibela ho chesa haholo.
3. Mefuta ea Li-Stabilizer tse Sebelisitsoeng ho Lisebelisoa tsa Liphaephe tsa PVC
Khetho ea sehatsetsi e ipapisitse le maemo a ts'ebetso, litlhoko tsa tšebeliso ea ho qetela, le ho latela melao. Mefuta e tloaelehileng e kenyelletsa:
4. Mekhoa ea Bohlokoa ea Khetho bakeng sa Lisebelisoa tsa Liphaephe
Ha bahlahisi ba totobatsa li-stabilizer bakeng sa li-fitting tsa liphaephe tsa PVC, ba tlameha ho nahana ka:
•Liparamente tsa Ts'ebetso:Dithempereichara tsa ho ntsha/ho bopa (160–200°C bakeng sa diphaephe) le dinako tsa ho dula di laola botsitso bo hlokahalang ba mocheso. Ditshebetso tsa mocheso o phahameng (mohlala, diphaephe tsa metsi a chesang) di hloka di-stabilizer tse nang le kganyetso e matla ya mocheso (mohlala, organotin).
•Tikoloho ea Tšebeliso ea Qetellong:Liphaephe tsa metsi a nooang li hloka setifikeiti sa NSF/ANSI 61 kapa WRAS, ho latelaCa-Znkapa di-organotin stabilizers. Diphaephe tsa kantle di hloka di-UV stabilizers mohlala, di-amine light stabilizers tse sitisitsweng (HALS).
•Ho Latela Melao:Lithibelo tsa lefats'e ka bophara mabapi le litšepe tse boima (Pb, Cd) li sutumelletsa indasteri ho ea mekhoeng e meng e sireletsang tikoloho (Ca-Zn, li-stabilizer tse thehiloeng linthong tsa tlhaho).
•Litšenyehelo khahlanong le Tshebetso:Leha di-stabilizer tse thehilweng hodima loto di le theko e tlase, ditjeo tsa nako e telele (mohlala, dikotlo tsa taolo, diphephetso tsa ho sebedisa botjha) di rata dikgetho tse tsitsitseng.
5. Mekhoa e Hlahang ea Theknoloji ea Stabilizer
Ha melaoana ea tikoloho e ntse e tiea 'me botsitso bo ntse bo etelloa pele, indasteri ea liphaephe tsa PVC e ntse e fetohela ho:
•Mekhoa ea Ca-Zn e Bokgoni bo Phahameng:E ntlafalitsoe ka li-co-stabilizer (mohlala, li-polyol, li-zeolite) ho lekana le ts'ebetso ea mocheso ea mekhoa e meng e thehiloeng ho loto.
•Li-Stabilizer tse sebetsang ka mesebetsi e mengata:Ho kopanya botsitso ba mocheso, ho hanyetsa mahlaseli a kotsi a UV, le ho tlotsa ka har'a sesebelisoa se le seng ho nolofatsa mekhoa.
•Li-Stabilizer tse Thehiloeng ho Bio:E nkiloe mehloling e nchafatsoang (mohlala, li-ester tse thehiloeng limela), tse lumellanang le lipheo tsa moruo o chitja.
Li-stabilizer tsa PVCke motheo oa ts'ebetso le bolelele ba nako ea li-fitting tsa liphaephe tsa PVC, tse nolofalletsang ts'ebeliso ea tsona e bolokehileng le e tšepahalang ho pholletsa le meralo ea motheo ea bohlokoa. Ho tloha ho thibeleng ho senyeha nakong ea tlhahiso ho isa ho netefatseng lilemo tse mashome tsa ts'ebeletso libakeng tse thata, karolo ea tsona ha e nkeloe sebaka. Ha indasteri e ntse e fetoha, ho tsepamisa maikutlo ho li-stabilizer tse nang le chefo e tlase, tse sebetsang hantle - haholo-holo li-complexes tsa calcium-zinc - ho tla khanna boqapi, ho leka-lekanya ts'ebetso le boikarabello ba tikoloho. Bakeng sa baenjiniere le bahlahisi, ho khetha stabilizer e nepahetseng ha se khetho ea tekheniki feela empa ke boitlamo ba ho tšoarella, polokeho le ho latela melao.
Nako ea poso: Loetse-02-2025