Litaba

Selelekela: Ho Rarolla Liphephetso tsa ho sebetsa ka Moroalo o Phahameng oa ATH/MDH Flame-Retardant Polyolefin Compounds

Indastering ea li-cable, litlhoko tse thata tsa ho lieha ha lelakabe li bohlokoa ho netefatsa polokeho ea basebetsi le lisebelisoa ha ho ka cha. Aluminium hydroxide (ATH) le magnesium hydroxide (MDH), e le li-halogen-free flame retardants, li sebelisoa haholo metsoakong ea lithapo tsa polyolefin ka lebaka la botsoalle ba tsona ba tikoloho, mosi o fokolang oa mosi, le ho lokolloa ha khase e sa senyang. Leha ho le joalo, ho finyella ts'ebetso e hlokehang e thibelang lelakabe hangata ho hloka hore ho kenyelelitsoe meroalo e phahameng ea ATH le MDH-hangata 50-70 wt% kapa holimo-ka har'a polyolefin matrix.

Le ha litaba tse joalo tsa li-filler li ntlafatsa haholo ho lieha ha lelakabe, li boetse li hlahisa liphephetso tse matla tsa ts'ebetso, ho kenyelletsa le ho eketseha ha viscosity ea ho qhibiliha, ho fokotseha ha phallo, thepa ea mochini e senyehileng, le boleng bo tlase ba bokaholimo. Litaba tsena li ka fokotsa haholo katleho ea tlhahiso le boleng ba sehlahisoa.

Sengoliloeng sena se ikemiselitse ho hlahloba ka tatellano liphephetso tsa ts'ebetso tse amanang le likhomphutha tsa polyolefin tse thibelang malakabe a mangata a ATH/MDH lits'ebetsong tsa cable. E ipapisitse le maikutlo a 'maraka le boiphihlelo bo sebetsang, eea tsebahatsa e sebetsang hantleho sebetsatlatsetsobakeng saho rarolla mathata ana. Litlhaloso tse fanoeng li reretsoe ho thusa baetsi ba lithapo le lithapo hore ba ntlafatse mekhoa ea tlhahiso le ho ntlafatsa mekhoa ea tlhahiso ha ba sebetsa ka lik'hemik'hale tse ngata tsa ATH/MDH tse thibelang malakabe a polyolefin.

Ho utloisisa ATH le MDH Flame Retardants

ATH le MDH ke lintho tse peli tse ka sehloohong tse thibelang malakabe, tse se nang halogen tse sebelisoang haholo linthong tsa polymer, haholo-holo lisebelisoa tsa cable moo maemo a tšireletso le a tikoloho a leng holimo. Li sebetsa ka ho senyeha ha endothermic le ho lokolloa ha metsi, ho hlapolla likhase tse tukang le ho etsa lesela le sireletsang la oxide holim'a thepa, e thibelang ho tuka le ho fokotsa mosi. ATH e senyeha hoo e ka bang 200-220 ° C, ha MDH e na le mocheso o phahameng oa ho bola oa 330-340 ° C, e leng se etsang hore MDH e tšoanelehe haholoanyane bakeng sa li-polymers tse sebetsoang ka mocheso o phahameng.

1. Mekhoa e thibelang lelakabe ea ATH le MDH e kenyelletsa:

1.1. Endothermic decomposition:

Ha ho futhumala, ATH (Al(OH) ₃) le MDH (Mg(OH) ₂) li na le ho senyeha ha endothermic, li monya mocheso o moholo le ho theola mocheso oa polymer ho liehisa ho senyeha ha mocheso.

ATH: 2Al(OH)₃ → Al₂O₃ + 3H₂O, ΔH ≈ 1051 J/g

MDH: Mg(OH)₂ → MgO + H₂O, ΔH ≈ 1316 J/g

1.2. Ho lokolloa ha mouoane oa metsi:

Mouoane o lokollotsoeng oa metsi o hlapolla likhase tse tukang ho potoloha polima, 'me o thibela ho fihlella oksijene, o thibela ho tuka.

1.3. Sebopeho sa lihlopha tse sireletsang:

Li-oxide tsa tšepe tse hlahisoang (Al₂O₃ le MgO) li kopana le polymer char layer ho etsa lera le letenya le sireletsang, le thibelang mocheso le ho kenella ha oksijene le ho sitisa ho lokolloa ha likhase tse tukang.

1.4. Khatello ea ho tsuba:

Lera le sireletsang le boetse le bapisa likaroloana tsa mosi, ho fokotsa bongata ba mosi ka kakaretso.

Ho sa tsotellehe ts'ebetso ea bona e babatsehang e thibelang malakabe le melemo ea tikoloho, ho finyella litekanyetso tse phahameng tse thibelang malakabe hangata ho hloka 50-70 wt% kapa ho feta ea ATH / MDH, e leng sesosa se ka sehloohong sa mathata a latelang a ho sebetsa.
2. Mathata a Bohlokoa a Ts'ebetso ea Moroalo o Phahameng oa ATH/MDH Polyolefin ho Lisebelisoa tsa Cable

2.1. Lintho tse mpe tsa rheological:

Lisebelisoa tse phahameng tsa li-filler haholo li eketsa viscosity e qhibilihisitsoeng le ho fokotsa phallo. Sena se etsa hore polasetiki le ho phalla nakong ea extrusion ho be thata le ho feta, ho hloka mocheso o phahameng oa ts'ebetso le matla a ho kuta, e leng ho eketsang tšebeliso ea matla le ho potlakisa ho roala ha lisebelisoa. Phallo e fokotsehileng ea ho qhibiliha e boetse e fokotsa lebelo la extrusion le katleho ea tlhahiso.

2.2. Mechini e fokotsehileng:

Li-filler tse ngata tse sa sebetseng li hlapolla matrix a polymer, li fokotsa matla a ho tsitsa, bolelele nakong ea khefu, le matla a ts'usumetso. Ka mohlala, ho kenyelletsa 50% kapa ho feta ATH / MDH ho ka fokotsa matla a tsitsitseng ka hoo e ka bang 40% kapa ho feta, ho baka phephetso bakeng sa lisebelisoa tsa cable tse tenyetsehang le tse tšoarellang.

2.3. Litaba tsa ho hasana:

Likaroloana tsa ATH le MDH hangata li bokellana ka har'a matrix a polymer, e lebisang ho khatello ea maikutlo, ho fokotsa ts'ebetso ea mochini, le bofokoli ba extrusion joalo ka bokhopo kapa libubble.

2.4. Boleng bo bobe ba bokaholimo:

Viscosity e phahameng ea ho qhibiliha, phallo e mpe, le tšebelisano e fokolang ea li-filler-polymer li ka baka hore bokaholimo ba extrudate bo be mahlahahlaha kapa bo se lekane, bo lebisang ho "letlalo la lishaka" kapa ho aha lefu. Ho bokellana ha lefu (die drool) ho ama ponahalo le tlhahiso e tsoelang pele.

2.5. Liphello tsa thepa ea motlakase:

Likahare tse phahameng tsa li-filler le phallo e sa lekanang li ka ama thepa ea dielectric, joalo ka ho hanyetsa molumo. Ho feta moo, ATH/MDH e na le mongobo o batlang o le holimo, o ka amang ts'ebetso ea motlakase le botsitso ba nako e telele libakeng tse mongobo.

2.6. Fesetere e nyane ea ts'ebetso:

Mefuta ea mocheso oa mocheso bakeng sa polyolefin e thibelang malakabe a mangata e patisane. ATH e qala ho bola ho pota 200°C, ha MDH e bola ho pota 330°C. Ho hlokahala taolo e nepahetseng ea mocheso ho thibela ho bola pele ho nako le ho netefatsa ts'ebetso e thibelang malakabe le botšepehi ba thepa.

Liphephetso tsena li etsa hore ho sebetsa ka bongata bo phahameng ba ATH/MDH polyolefin ho be thata le ho totobatsa tlhokahalo ea lithuso tse sebetsang tsa ho sebetsa.

Kahoo, ho rarolla mathata ana, lithuso tse fapaneng tsa ts'ebetso li entsoe le ho sebelisoa indastering ea li-cable. Lithuso tsena li ntlafatsa tšebelisano ea sefahleho sa polymer-filler, li fokotsa viscosity ea ho qhibiliha, 'me li ntlafatsa ho hasana ha li-filler, li ntlafatsa ts'ebetso ea ts'ebetso le thepa ea ho qetela ea mochini.

Ke lithuso life tsa ho sebetsa tse sebetsang hantle haholo bakeng sa ho rarolla mathata a ts'ebetso le boleng ba bokaholimo ba metsoako e phahameng ea ATH/MDH e thibelang malakabe a polyolefin lits'ebetsong tsa indasteri ea cable?

Li-additives tse thehiloeng ho silicone le lithuso tsa tlhahiso:

SILIKE e fana ka mekhoa e mengatalithuso tsa ho sebetsa tse thehiloeng ho polysiloxanebakeng sa li-thermoplastics tse tloaelehileng le lipolasetiki tsa boenjiniere, tse thusang ho ntlafatsa ts'ebetso le ho ntlafatsa ts'ebetso ea lihlahisoa tse felileng. Litharollo tsa rona li tloha ho silicone masterbatch e tšepahalang ea LYSI-401 ho ea ho tlatsetso e ncha ea SC920-e etselitsoeng ho fana ka ts'ebetso e kholo le ho ts'epahala ho LSZH e se nang halogen le HFFR LSZH cable extrusion.

Ka ho khetheha,SILIKE UHMW li-additives tse entsoeng ka silicone tse thehiloeng ho lubricantli ipakile li le molemo bakeng sa metsoako ea ATH/MDH e thibelang malakabe ea polyolefin ka har'a likhoele. Liphello tsa bohlokoa li kenyelletsa:

1. Ho fokotseha ha viscosity ea ho qhibiliha: Polysiloxanes e fallela sebakeng se qhibilihisitsoeng nakong ea ts'ebetso, e etsa filimi e tlotsang e fokotsang ho ferekanngoa le lisebelisoa le ho ntlafatsa phallo.

2. Phatlalatso e ntlafetseng: Li-additives tse thehiloeng ka silicon li khothalletsa kabo e tšoanang ea ATH / MDH ka har'a matrix a polymer, ho fokotsa ho kopanya likaroloana.

3. Boleng bo ntlafetseng ba bokaholimo:LYSI-401 silicone masterbatche fokotsa ho hahuoa ha lefu le ho qhibiliha ha fracture, e hlahisa libaka tse boreleli tsa extrudate tse nang le mefokolo e fokolang.

4. Lebelo le lebelo la mohala:Silicone Processing Aid SC920e loketse bakeng sa extrusion e phahameng ea lithapo. E ka thibela ho se tsitse ha bophara ba terata le ho thella ha screw, le ho ntlafatsa katleho ea tlhahiso. Ka tšebeliso e tšoanang ea matla, molumo oa extrusion o ile oa eketseha ka 10%.

5. Mehaho e ntlafetseng ea mochine: Ka ho ntlafatsa ho hasana ha li-filler le ho khomarela sefahleho, silicone masterbatch e ntlafatsa ho hanyetsa ho apara ka mokhoa o kopantsoeng le ts'ebetso ea mochine, joalo ka thepa ea ts'ebetso & elongation nakong ea khefu.

6. Tšebelisano e thibelang malakabe le khatello ea mosi: li-additives tsa siloxane li ka eketsa ts'ebetso e thibelang lelakabe hanyenyane (mohlala, ho eketsa LOI) le ho fokotsa ho ntšoa ha mosi.

SILIKE ke moetsi ea ka sehloohong oa li-additives tse thehiloeng ho silicone, lisebelisoa tsa ho sebetsa, le li-elastomer tsa silicone tsa thermoplastic sebakeng sa Asia-Pacific.

Tsa ronalisebelisoa tsa ho sebetsa tsa siliconeli sebelisoa haholo indastering ea thermoplastics le cable ho ntlafatsa ts'ebetso, ho ntlafatsa phallo ea li-filler, ho fokotsa viscosity ea ho qhibiliha, le ho fana ka libaka tse boreleli ka katleho e phahameng.

Har'a tsona, silicone masterbatch LYSI-401 le lisebelisoa tse ncha tsa SC920 silicone ke litharollo tse netefalitsoeng bakeng sa liforomo tsa polyolefin tsa ATH/MDH, haholo ho LSZH le HFFR extrusion ea cable. Ka ho kopanya li-additives tse thehiloeng ho silicone tsa SILIKE le lisebelisoa tsa tlhahiso, bahlahisi ba ka finyella tlhahiso e tsitsitseng le boleng bo tsitsitseng.

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