Polyethylene low density na linzamin kwamfuta, tsari daban-daban da ƙarancin ƙarancin polyethylene na gabaɗaya, saboda babu dogon rassan sarƙoƙi.Lissafin layi na LLDPE ya dogara da nau'o'in samarwa da sarrafawa daban-daban na LLDPE da LDPE.LLDPE yawanci ana samuwa ta hanyar copolymerization na ethylene da mafi girma alpha olefins kamar butene, hexene ko octene a ƙananan zafin jiki da matsa lamba.Polymer LLDPE da aka samar da tsarin copolymerization yana da kunkuntar rarraba nauyin kwayoyin halitta fiye da LDPE na gaba ɗaya, kuma a lokaci guda yana da tsarin layi wanda ya sa ya sami nau'ikan rheological daban-daban.
narke kwarara Properties
Abubuwan da ke narkewa na LLDPE sun dace da bukatun sabon tsari, musamman ma tsarin extrusion na fim, wanda zai iya samar da samfurori na LLDPE masu inganci.Ana amfani da LLDPE a duk kasuwannin gargajiya don polyethylene.Ingantattun shimfidawa, shiga, tasiri da kaddarorin juriya sun sa LLDPE ya dace da fina-finai.Kyakkyawan juriya ga fatattaka damuwa na muhalli, juriya mai ƙarancin zafin jiki da juriya na warpage yana sa LLDPE kyakkyawa ga bututu, fitar da takarda da duk aikace-aikacen gyare-gyare.Sabuwar aikace-aikacen LLDPE shine a matsayin ciyawa don wuraren da ake zubar da ƙasa da kuma rufin tafkunan sharar gida.
Production da Halaye
Samar da LLDPE yana farawa tare da masu haɓaka ƙarfe na canji, musamman na nau'in Ziegler ko Phillips.Sabbin matakai dangane da abubuwan haɓaka ƙarfe na cycloolefin wani zaɓi ne don samar da LLDPE.Ainihin polymerization dauki za a iya za'ayi a cikin bayani da kuma gas lokaci reactors.Yawanci, octene ne copolymerized da ethylene da butene a cikin wani bayani lokaci reactor.Hexene da ethylene suna polymerized a cikin wani lokaci na gas reactor.Gudun LLDPE da aka samar a cikin injin sarrafa iskar gas yana cikin nau'i na musamman kuma ana iya siyar da shi azaman foda ko a ƙara sarrafa shi zuwa pellets.Wani sabon ƙarni na super LLDPE dangane da hexene da octene Mobile, Union Carbide ya haɓaka.Kamfanoni irin su Novacor da Dow Plastics sun ƙaddamar.Waɗannan kayan suna da babban iyaka tauri kuma suna da sabon yuwuwar aikace-aikacen cire jaka ta atomatik.PE resin ƙananan ƙarancin yawa (yawan da ke ƙasa 0.910g/cc.) Hakanan ya bayyana a cikin 'yan shekarun nan.VLDPES yana da sassauci da taushi wanda LLDPE ba zai iya cimma ba.Kaddarorin resins gabaɗaya suna nunawa a cikin index narke da yawa.Fihirisar narke tana nuna matsakaicin nauyin kwayoyin halitta na guduro kuma ana sarrafa shi da farko ta wurin zafin jiki.Matsakaicin nauyin kwayoyin halitta mai zaman kansa ne daga rarraba nauyin kwayoyin halitta (MWD).Zaɓin mai haɓakawa yana shafar MWD.An ƙayyade yawa ta hanyar tattarawar comomer a cikin sarkar polyethylene.Mahimmanci mai mahimmanci yana sarrafa adadin gajerun rassan rassan (tsawon su ya dogara da nau'in comonomer) don haka yana sarrafa girman resin.Mafi girman taro mai haɗaka, ƙananan ƙarancin guduro.A tsari, LLDPE ya bambanta da LDPE a cikin adadi da nau'in rassan, LDPE mai girma yana da rassa masu tsayi, yayin da LDPE na layi yana da ƙananan rassa.
sarrafawa
Dukansu LDPE da LLDPE suna da kyakkyawar rheology ko narke kwarara.LLDPE yana da ƙarancin juzu'i saboda kunkuntar rabonta na nauyin kwayoyin halitta da gajeriyar rassan sarƙoƙi.A lokacin shearing (misali extrusion), LLDPE yana riƙe da ɗanko mafi girma don haka ya fi wahalar sarrafawa fiye da LDPE tare da ma'aunin narkewa iri ɗaya.A cikin extrusion, ƙananan ƙarancin ƙarfi na LLDPE yana ba da izinin shakatawa da sauri na sarƙoƙi na ƙwayoyin ƙwayoyin polymer, don haka rage yawan hankali na kaddarorin jiki zuwa canje-canje a cikin rabon busawa.A cikin tsawaita narkewa, LLDPE ya bambanta ƙarƙashin nau'ikan iri Gabaɗaya suna da ƙananan danko a cikin sauri.Wato, ba zai yi ƙarfi ba lokacin da aka shimfiɗa shi kamar LDPE.Ƙara tare da nakasar adadin polyethylene.LDPE yana nuna haɓaka mai ban mamaki a cikin danko, wanda ke haifar da sarƙoƙin ƙwayoyin cuta.Ba a lura da wannan al'amari a cikin LLDPE saboda rashin dogon rassan sarkar a cikin LLDPE yana kiyaye polymer daga haɗewa.Wannan kadarar tana da mahimmanci ga aikace-aikacen fim na bakin ciki.Saboda fina-finan LLDPE na iya yin fina-finai masu sauƙi cikin sauƙi yayin da suke riƙe ƙarfi da ƙarfi.Za'a iya taƙaita kaddarorin rheological na LLDPE a matsayin "mai ƙarfi a cikin ƙarfi" da "laushi a tsawo".
Lokacin aikawa: Oktoba-21-2022