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Isingeniso: Ukuxazulula Izinselele Zokucubungula I-ATH/MDH Flame-Retardant Polyolefin Compounds Processing

Embonini yamakhebula, izidingo eziqinile zokunqanda ilangabi zibalulekile ukuze kuqinisekiswe ukuphepha kwabasebenzi kanye nemishini uma kwenzeka kuba nomlilo. I-Aluminium hydroxide (ATH) ne-magnesium hydroxide (MDH), njengezinqamuli zomlilo ezingenalo i-halogen, zisetshenziswa kakhulu kumakhebula we-polyolefin ngenxa yobungane bemvelo, ukukhishwa kwentuthu ephansi, kanye nokukhishwa kwegesi engagqwali. Kodwa-ke, ukufeza ukusebenza okudingekayo kokulawula ilangabi kuvame ukudinga ukuthi kufakwe ukulayishwa okuphezulu kwe-ATH ne-MDH—imvamisa engu-50–70 wt% noma ngaphezulu—ku-polyolefin matrix.

Nakuba okuqukethwe kokugcwalisa okuphezulu okunjalo kuthuthukisa kakhulu ukubambezeleka komlilo, kuphinda kwethule izinselele ezinzima zokucubungula, okuhlanganisa ukukhuphuka kokuncibilika kwe-viscosity, ukugeleza okuncishisiwe, izici zemishini ezisengozini, kanye nekhwalithi ephezulu ephansi. Lezi zinkinga zingakhawulela kakhulu ukusebenza kahle kokukhiqiza kanye nekhwalithi yomkhiqizo.

Lesi sihloko sihlose ukuhlola ngokuhlelekile izinselele zokucubungula ezihlobene nezinhlanganisela ze-polyolefin ezibuyisela amalangabi ezilayisha kakhulu i-ATH/MDH ezinhlelweni zekhebula. Ngokusekelwe kumpendulo yemakethe nolwazi olusebenzayo, itikhomba ngempumeleloukucubungulaizithasiselookweukubhekana nalezi zinselelo. Imininingwane enikeziwe ihloselwe ukusiza abakhiqizi bezintambo nezintambo ukuthi bathuthukise ukwakheka futhi bathuthukise izinqubo zokukhiqiza lapho besebenza nezinhlanganisela ze-pololefin ezibuyisela amalangabi ze-ATH/MDH ezilayisha kakhulu.

Ukuqonda i-ATH kanye ne-MDH Flame Retardants

I-ATH ne-MDH yizinqamuli zomlilo ezimbili ezinkulu ezingaphili, ezingenawo i-halogen ezisetshenziswa kakhulu ezintweni ze-polymer, ikakhulukazi ekufakweni kwekhebula lapho amazinga okuphepha nawemvelo ephakeme. Zenza ngokubola kwe-endothermic kanye nokukhishwa kwamanzi, zihlambulule amagesi avuthayo futhi zenze ungqimba lwe-oxide oluvikelayo endaweni ebonakalayo, ecindezela ukuvutha nokunciphisa intuthu. I-ATH ibola cishe ku-200-220 ° C, kuyilapho i-MDH inezinga lokushisa eliphakeme lokubola lika-330-340 ° C, okwenza i-MDH ifaneleke kakhulu kuma-polymers acutshungulwa emazingeni okushisa aphezulu.

1. Izindlela zokuvala amalangabi ze-ATH ne-MDH zihlanganisa:

1.1. Ukubola kwe-Endothermic:

Lapho ishisa, i-ATH (Al(OH)₃) ne-MDH (Mg(OH)₂) iqala ukubola, ibamba ukushisa okubalulekile futhi yehlise izinga lokushisa le-polymer ukuze kubambezeleke ukuwohloka kokushisa.

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

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

1.2. Ukukhishwa komhwamuko wamanzi:

Umhwamuko wamanzi okhishiwe uhlanza amagesi avuthayo azungeze i-polymer futhi unqande ukufinyelela komoyampilo, uvimbela ukuvutha.

1.3. Ukwakhiwa kwezingqimba zokuzivikela:

Ama-oxide ensimbi aphumayo (i-Al₂O₃ ne-MgO) ahlangana nongqimba lwe-polymer char ukuze kwakhe ungqimba oluqinile oluvikelayo, oluvimba ukushisa nokungena komoyampilo futhi luvimbele ukukhishwa kwamagesi avuthayo.

1.4. Ukunciphisa intuthu:

Isendlalelo esivikelayo siphinde sikhangise izinhlayiya zentuthu, sinciphise ukuminyana kwentuthu isiyonke.

Naphezu kokusebenza kwazo okuhle kakhulu kokuvimbela ilangabi kanye nezinzuzo zemvelo, ukuzuza izilinganiso ezibambezela ilangabi ngokuvamile kudinga u-50–70 wt% noma ngaphezulu we-ATH/MDH, okuyimbangela eyinhloko yezinselele zokucubungula ezilandelayo.
2. Izinselele Ezibalulekile Zokucubungula Zomthwalo Omkhulu we-ATH/MDH Polyolefins Ezicelweni Zekhebula

2.1. Izimpawu ze-rheological eziwohlokayo:

Ukulayishwa kwe-filler ephezulu kukhulisa kakhulu i-viscosity yokuncibilika futhi kunciphise ukugeleza. Lokhu kwenza i-plasticization kanye nokugeleza ngesikhathi se-extrusion kube nzima kakhulu, kudinga amazinga okushisa aphezulu okucubungula kanye namandla okugunda, okwandisa ukusetshenziswa kwamandla futhi kusheshise ukugqokwa kwemishini. Ukuncibilika kokuncibilika kokuncibilika kuphinde kukhawulele isivinini sokukhipha kanye nokusebenza kahle kokukhiqiza.

2.2. Izakhiwo zemishini ezincishisiwe:

Izithako ezinkulu zokugcwalisa i-inorganic dilute i-polymer matrix, ehlisa ngokuphawulekayo amandla aqinile, ubude ngesikhathi sekhefu, namandla okuthonya. Isibonelo, ukufaka u-50% noma ngaphezulu kwe-ATH/MDH kungase kunciphise amandla okubamba cishe ngo-40% noma ngaphezulu, kubangele inselelo yezinto zekhebula eziguquguqukayo neziqinile.

2.3. Izinkinga zokusabalalisa:

Izinhlayiya ze-ATH ne-MDH zivame ukunqwabelana ku-polymer matrix, okuholela ezindaweni zokugxilisa ingqondo, ukuncipha kokusebenza komshini, kanye nokukhubazeka kokukhipha okufana nokubangwa komhlaba noma amabhamuza.

2.4. Ikhwalithi yendawo engeyinhle:

I-viscosity ephezulu yokuncibilika, ukuhlakazeka okungekuhle, kanye nokuhambisana okulinganiselwe kwe-filler-polymer kungabangela izindawo ezikhipha i-extrudate ukuthi zibe mahhlonze noma zingalingani, okuholela “esikhumba sikashaka” noma ukwakheka kokufa. Ukunqwabelana lapho kufa (die drool) kuthinta kokubili ukubukeka nokukhiqiza okuqhubekayo.

2.5. Imithelela yezakhiwo zikagesi:

Okuqukethwe kokugcwalisa okuphezulu nokuhlakazeka okungalingani kungathinta izakhiwo ze-dielectric, ezifana nokumelana nevolumu. Ngaphezu kwalokho, i-ATH/MDH inokumunca umswakama ophezulu uma kuqhathaniswa, okungase kube nomthelela ekusebenzeni kukagesi nokuzinza kwesikhathi eside ezindaweni ezinomswakama.

2.6. Iwindi elincane lokucubungula:

Ibanga lokushisa elicutshungulwayo lama-polyolefin ane-flame-retardant elayisha kakhulu lincane. I-ATH iqala ukubola cishe ngo-200°C, kuyilapho i-MDH ibola cishe ngo-330°C. Ukulawulwa kwezinga lokushisa okunembile kuyadingeka ukuze kuvinjwe ukubola ngaphambi kwesikhathi nokuqinisekisa ukusebenza okunqanda amalangabi nobuqotho bezinto ezibonakalayo.

Lezi zinselele zenza ukucubungula i-ATH/MDH polyolefins enomthwalo omkhulu kube nzima futhi kugqamise isidingo sezinsiza ezisebenzayo zokucubungula.

Ngakho-ke, ukuze kubhekwane nalezi zinselele, kuye kwathuthukiswa izinsiza ezihlukahlukene zokucubungula futhi zasetshenziswa embonini yamakhebula. Lezi zinsiza zithuthukisa ukuhambisana kwe-polymer-filler interfacial, zinciphisa i-viscosity ye-ncibilika, futhi zithuthukise ukuhlakazeka kwe-filler, zenze kokubili ukusebenza kokucubungula kanye nezakhiwo zokugcina zemishini.

Iziphi izinsiza zokucubungula ezisebenza kahle kakhulu ekuxazululeni izinkinga zokucubungula kanye nekhwalithi yendawo ephezulu yomthwalo we-ATH/MDH wezinhlanganisela ze-polyolefin ezibushela ilangabi ezinhlelweni zokusebenza zemboni yezintambo?

Izithasiselo ezisekelwe ku-silicone nezinsiza zokukhiqiza:

I-SILIKE inikeza izinto ezihlukahlukeneizinsiza zokucubungula ezisekelwe ku-polysiloxanekukho kokubili ama-thermoplastics ajwayelekile kanye namapulasitiki obunjiniyela, okusiza ukuthuthukisa ukucubungula nokuthuthukisa ukusebenza kwemikhiqizo eqediwe. Izixazululo zethu zisukela ku-silicone masterbatch ethenjwayo i-LYSI-401 kuye kusithasiselo se-SC920 esisha—esiklanyelwe ukuletha ukusebenza kahle okukhulu nokwethenjwa ekukhishweni kwekhebula ye-LSZH elayisha kakhulu, engena-halogen kanye ne-HFFR LSZH.

Ngokuqondile,SILIKE UHMW izithasiselo zokucubungula ze-silicone ezisekelwe ku-lubricantkuye kwafakazelwa ukuthi kunenzuzo kumakhompiyutha e-ATH/MDH avimbela ilangabi le-polyolefin kumakhebuli. Imithelela ebalulekile ihlanganisa:

1. I-viscosity encibilikisiwe yokuncibilika: I-Polysiloxanes ithuthela endaweni encibilikayo ngesikhathi sokucubungula, yenza ifilimu yokugcoba enciphisa ukungqubuzana nemishini futhi ithuthukise ukugeleza.

2. Ukusabalalisa okuthuthukisiwe: Izithasiselo ezisekelwe ku-silicon zikhuthaza ukusatshalaliswa okufanayo kwe-ATH/MDH ku-matrix ye-polymer, ukunciphisa ukuhlanganisa izinhlayiyana.

3. Ikhwalithi yendawo ethuthukisiwe:I-LYSI-401 silicone masterbatchinciphisa ukwakheka kokufa kanye nokuncibilika kokuncibilika, ikhiqize izindawo ezibushelelezi ze-extrudate ezinokukhubazeka okumbalwa.

4. Isivinini somugqa osheshayo:ISilicone Processing Aid SC920ilungele izintambo ezihamba ngesivinini esiphezulu. Ingavimbela ukuntengantenga kobubanzi bocingo kanye nokushelela kwesikulufu, futhi ithuthukise ukusebenza kahle kokukhiqiza. Ngesikhathi esifanayo ukusetshenziswa kwamandla, ivolumu extrusion inyuke ngo-10%.

5. Izakhiwo zemishini ezithuthukisiwe: Ngokuthuthukisa ukuhlakazeka kwe-filler nokunamathela kobuso, i-silicone masterbatch ithuthukisa ukumelana nokuguga okuhlanganisiwe kanye nokusebenza komshini, okufana nomthelela wesakhiwo nokwelulwa ngesikhathi sekhefu.

6. I-synergism evimbela amalangabi nokucindezelwa kwentuthu: izithasiselo ze-siloxane zingathuthukisa kancane ukusebenza kwe-flame-retardant (isb, ukukhulisa i-LOI) futhi kunciphise ukukhishwa kwentuthu.

I-SILIKE ingumkhiqizi ohamba phambili wezithasiselo ezisekelwe ku-silicone, izinsiza zokucubungula, nama-thermoplastic silicone elastomers esifundeni sase-Asia-Pacific.

Eyethuizinsiza zokucubungula i-siliconezisetshenziswa kabanzi embonini ye-thermoplastics kanye nekhebula ukwenza ngcono ukucutshungulwa, ukuthuthukisa ukuhlakazwa kwe-filler, ukunciphisa i-viscosity encibilikayo, nokuletha izindawo ezibushelelezi ngokusebenza kahle okuphezulu.

Phakathi kwazo, i-silicone masterbatch LYSI-401 kanye ne-SC920 silicone processing aid kuyizixazululo ezifakazelwe ze-ATH/MDH ezibuyisela amalangabi e-polyolefin, ikakhulukazi ku-LSZH kanye ne-HFFR extrusion. Ngokuhlanganisa izithasiselo ezisekelwe ku-silicone nezinsiza zokukhiqiza ze-SILIKE, abakhiqizi bangakwazi ukuzuza ukukhiqiza okuzinzile kanye nekhwalithi engaguquki.

If you are looking for silicone processing aids for ATH/MDH compounds, polysiloxane additives for flame-retardant polyolefins, silicone masterbatch for LSZH / HFFR cables, improve dispersion in ATH/MDH cable compounds, reduce melt viscosity flame-retardant polyolefin extrusion, cable extrusion processing additives, silicone-based extrusion aids for wires and cables, please visit www.siliketech.com or contact us at amy.wang@silike.cn to learn more.