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Intshayelelo: Ukusombulula i-ATH/MDH Flame-Retardant Polyolefin Compounds Comppounds Processing Challenges

Kwishishini lekhebula, iimfuno ezingqongqo zokuncipha komlilo zibalulekile ukuqinisekisa ukhuseleko lwabasebenzi kunye nezixhobo xa kutsha. I-Aluminium hydroxide (ATH) kunye ne-magnesium hydroxide (MDH), njenge-halogen-free flame retardants, isetyenziswa ngokubanzi kwiikhompawundi zentambo ye-polyolefin ngenxa yobuhlobo babo bendalo, ukukhutshwa komsi ophantsi, kunye nokukhutshwa kwegesi engagqwaliyo. Nangona kunjalo, ukufezekisa umsebenzi ofunekayo wokunqanda ilangatye kudla ngokuyimfuneko ukubandakanya ukulayishwa okuphezulu kwe-ATH kunye ne-MDH-ngokuqhelekileyo i-50-70 wt% okanye ngaphezulu-kwi-polyolefin matrix.

Ngelixa umxholo ololo hlobo lokugcwalisa ngokubonakalayo uphucula kakhulu ukulibaziseka komlilo, ukwazisa imiceli mngeni enzima yokusetyenzwa, kubandakanya ukwanda kwe-viscosity yokunyibilika, ukuncitshiswa kokuhamba, ukuthotywa kweempawu zoomatshini, kunye nomgangatho ophantsi womphezulu. Le miba inokunciphisa kakhulu ukusebenza kakuhle kwemveliso kunye nomgangatho wemveliso.

Eli nqaku lijolise ekuhloleni ngokucwangcisiweyo imingeni yokucubungula ehambelana nomthwalo ophezulu we-ATH / MDH i-flame-retardant polyolefin compounds kwi-cable applications. Ngokusekwe kwingxelo yentengiso kunye namava asebenzayo, itichonga esebenzayoukuqhubekekaizongezongenxaukujongana nale mingeni. Ukuqonda okubonelelweyo kujoliswe ekuncedeni abenzi bocingo kunye nabavelisi bekhebula baphucule ukuqulunqwa kunye nokuphucula iinkqubo zokuvelisa xa besebenza ngomthwalo ophezulu we-ATH / MDH i-flame-retardant polyolefin compounds.

Ukuqonda i-ATH kunye ne-MDH Flame Retardants

I-ATH kunye ne-MDH zimbini ezinkulu ze-inorganic, i-halogen-free flame retardants esetyenziswa kakhulu kwizinto ze-polymer, ngokukodwa kwizicelo zentambo apho imigangatho yokhuseleko kunye nokusingqongileyo iphezulu. Benza ngokubola kwe-endothermic kunye nokukhululwa kwamanzi, ukuhlambulula iigesi ezivuthayo kunye nokwenza umaleko we-oxide okhuselayo kumphezulu wezinto eziphathekayo, othintela ukutsha kunye nokunciphisa umsi. I-ATH ibola malunga ne-200-220 ° C, ngelixa i-MDH inokushisa okuphezulu kokubola kwe-330-340 ° C, okwenza i-MDH ifaneleke ngakumbi kwiipolymers ezicutshungulwayo kumaqondo aphezulu.

1. Iindlela zokunqanda amadangatya ze-ATH kunye ne-MDH ziquka:

1.1. Ukubola kweEndothermic:

Ekufudumeni, i-ATH (Al(OH) ₃) kunye ne-MDH (Mg (OH) ₂) ifumana ukubola kwe-endothermic, ifunxa ubushushu obubalulekileyo kwaye ihlise ubushushu bepolymer ukulibazisa ukuthotywa kwe-thermal.

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

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

1.2. Ukukhutshwa komphunga wamanzi:

Umphunga wamanzi okhutshiweyo unciphisa iigesi ezinokutsha ezijikeleze i-polymer kwaye unqande ukufikelela kweoksijini, ukuthintela ukutsha.

1.3. Ukwenziwa kweeleya ezikhuselayo:

I-oxide yesinyithi ebangelwayo (i-Al₂O₃ kunye ne-MgO) idibanisa kunye ne-polymer char layer ukwenza i-dense layer ekhuselayo, evimba ukushisa kunye nokungena kwe-oksijini kwaye ithintele ukukhutshwa kweegesi ezivuthayo.

1.4. Uthintelo lomsi:

Uluhlu olukhuselayo lukwabhengeza amasuntswana omsi, ukunciphisa ubuninzi bomsi ngokubanzi.

Ngaphandle kokusebenza kwabo okugqwesileyo komlilo kunye neenzuzo zokusingqongileyo, ukufezekisa ukulinganiswa okuphezulu kwe-flame-retardant ngokuqhelekileyo kufuna i-50-70 wt% okanye ngaphezulu kwe-ATH / MDH, eyona nto ibangela ukuba ilandele imingeni elandelayo.
2. Imingeni ePhambili yokuLungiselela i-High-Load ATH/MDH Polyolefins kwii-Cable Applications

2.1. Iimpawu zokuwohloka kwe-rheological:

Ukulayishwa kwezihluzi eziphezulu kakhulu kwandisa i-viscosity yokunyibilika kunye nokunciphisa ukuhamba. Oku kwenza iplastiki kunye nokuhamba ngexesha le-extrusion kube nzima ngakumbi, kufuna amaqondo aphezulu okushisa kunye nemikhosi yokucheba, okwandisa ukusetyenziswa kwamandla kunye nokukhawuleza ukunxiba izixhobo. Ukuncitshiswa kwe-melt flow kukwanciphisa isantya se-extrusion kunye nokusebenza kakuhle kwemveliso.

2.2. Iipropati zoomatshini ezincitshisiweyo:

Izixa ezikhulu zezihluzi ze-inorganic zenza i-polymer matrix, iyancipha kakhulu amandla okuqina, ubude ngexesha lekhefu, kunye namandla empembelelo. Ngokomzekelo, ukubandakanya i-50% okanye ngaphezulu kwe-ATH / MDH kunokunciphisa amandla e-tensile malunga ne-40% okanye ngaphezulu, ibeka umngeni kwizinto zekhebula eziguquguqukayo kunye nezizinzileyo.

2.3. Imiba yokusasazwa:

Iincinci ze-ATH kunye ne-MDH zihlala zidibanisa kwi-matrix ye-polymer, ekhokelela kwiindawo zokuxininisa uxinzelelo, ukunciphisa ukusebenza komatshini, kunye neziphene ze-extrusion ezifana ne-roughness okanye iibhubhu.

2.4. Umgangatho ophantsi womphezulu:

I-viscosity ephezulu yokunyibilika, ukusasazwa kakubi, kunye nokuhambelana okulinganiselweyo kwe-filler-polymer kunokubangela ukuba umphezulu we-extrudate ube rhabaxa okanye ungalingani, okukhokelela "kwisikhumba sikakrebe" okanye ukwakhiwa. Ukuqokelelana kwi-die (die drool) kuchaphazela imbonakalo kunye nemveliso eqhubekayo.

2.5. Iimpembelelo zepropati yombane:

Umxholo ophezulu wokuzalisa kunye nokusabalalisa okungalinganiyo kunokuchaphazela iipropati ze-dielectric, ezifana nokumelana nomthamo. Ngaphezu koko, i-ATH/MDH inokufunxeka okuphezulu kakhulu, okunokuthi kuchaphazele ukusebenza kombane kunye nokuzinza kwexesha elide kwiindawo ezifumileyo.

2.6. Ifestile yokuqhubekeka emxinwa:

Uluhlu lweqondo lokushisa lomthwalo ophezulu we-polyolefin e-flame-retardant lumxinwa. I-ATH iqala ukubola malunga ne-200 ° C, ngelixa i-MDH ibola malunga ne-330 ° C. Ulawulo oluchanekileyo lweqondo lokushisa luyafuneka ukukhusela ukubola kwangaphambi kwexesha kunye nokuqinisekisa ukusebenza kwe-flame-retardant kunye nokuthembeka kwezinto eziphathekayo.

Le mingeni yenza ukusetyenzwa okuphezulu komthwalo we-ATH/MDH polyolefins kuntsonkothile kwaye kuqaqambise imfuneko yoncedo olusebenzayo lokuqhuba.

Ke, ukujongana nale mingeni, izixhobo ezahlukeneyo zokuncedisa ziye zaphuhliswa kwaye zasetyenziswa kushishino lweentambo. Ezi zincedisi ziphucula ukuhambelana kwe-polymer-filler interfacial, ukunciphisa i-viscosity yokunyibilika, kunye nokuphucula ukusasazwa kwefayili, ukulungelelanisa ukusebenza kokubini kunye neempawu zokugqibela zoomatshini.

Zeziphi izixhobo zokusebenza ezisebenza kakhulu ekusombululeni ukusetyenzwa kunye nemiba yobulunga bomphezulu womthwalo ophezulu we-ATH/MDH iikhompawundi ze-pololefin ezibuyiswa ngamadangatya kwizicelo zeshishini lentambo?

Izongezo ezisekelwe kwi-silicone kunye nezixhobo zokuvelisa:

I-SILIKE ibonelela ngezinto ezininzii-polysiloxane-based processing aidskuzo zombini i-thermoplastics esemgangathweni kunye neeplastiki zobunjineli, ezinceda ukwandisa ukusetyenzwa kunye nokuphucula ukusebenza kweemveliso ezigqityiweyo. Izisombululo zethu zisusela kwi-silicone masterbatch ethembekileyo i-LYSI-401 ukuya kwi-SC920 eyongeziweyo-eyenzelwe ukuhambisa ukusebenza kakuhle kunye nokuthembeka kumthwalo ophezulu, i-halogen-free LSZH kunye ne-HFFR LSZH ikhebula extrusion.

Ngokukodwa,SILIKE UHMW i-silicone-based lubricant processing additiveszibonakaliswe ziluncedo kwi-ATH/MDH iikhompawundi ze-polyolefin ezibuyisela idangatye kwiintambo. Iziphumo eziphambili ziquka:

1. Ukunciphisa i-viscosity ye-melt: I-Polysiloxanes ifudukela kwi-melt surface ngexesha lokucubungula, yenze ifilimu yokuthambisa eyanciphisa ukungqubuzana kunye nezixhobo kunye nokuphucula ukuhamba.

2. Ukusabalalisa okuphuculweyo: I-Silicon-based Additives ikhuthaza ukusabalalisa okufanayo kwe-ATH / MDH kwi-matrix ye-polymer, ukunciphisa i-particle aggregation.

3. Umgangatho ophuculweyo womphezulu:I-LYSI-401 i-silicone masterbatchkunciphisa ukwakhiwa kokufa kunye nokunyibilika kokuqhekeka, ukuvelisa imiphezulu egudileyo ekhuphayo eneziphene ezimbalwa.

4. Isantya somgca okhawulezayo:ISilicone Processing Aid SC920ifanelekile kwi-high-speed extrusion yeentambo. Inokuthintela ukungazinzi kwedayamitha yocingo kunye ne-screw slippage, kunye nokuphucula ukusebenza kakuhle kwemveliso. Ngexesha elifanayo lokusetyenziswa kwamandla, umthamo we-extrusion unyuke nge-10%.

5. Iipropathi eziphuculweyo zoomatshini: Ngokuphucula i-filler dispersion kunye ne-interfacial adhesion, i-silicone masterbatch iphucula ukuxhathisa ukunxiba kunye nokusebenza koomatshini, njengepropathi yempembelelo kunye nokwandiswa ngexesha lekhefu.

6. I-synergism ekwazi ukumelana nomlilo kunye nokuthomalalisa umsi: izongezo ze-siloxane zinokuphucula kancinane ukusebenza kwe-flame-retardant (umzekelo, ukwandisa i-LOI) kunye nokunciphisa ukukhutshwa komsi.

I-SILIKE ngumvelisi ophambili wezongezo ezisekwe kwi-silicone, izixhobo zokusebenza, kunye ne-thermoplastic silicone elastomers kwingingqi ye-Asia-Pacific.

Yethuizixhobo zokulungisa i-siliconezisetyenziswa ngokubanzi kwi-thermoplastics kunye namashishini ekhebula ukwenza ngcono ukusetyenzwa, ukuphucula ukusasazwa kwefayili, ukunciphisa i-viscosity enyibilikayo, kunye nokuhambisa iindawo ezigudileyo ngokusebenza okuphezulu.

Phakathi kwazo, i-silicone masterbatch LYSI-401 kunye ne-SC920 entsha yokuncedisa i-silicone processing aid zizisombululo eziqinisekisiweyo ze-ATH / MDH i-flame-retardant polyolefin formulations, ngakumbi kwi-LSZH kunye ne-HFFR ye-cable extrusion. Ngokudibanisa izongezo ze-silicone ezisekelwe kwi-SILIKE kunye nezixhobo zokuvelisa, abavelisi banokufikelela kwimveliso ezinzileyo kunye nomgangatho ohambelanayo.

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.