Kugereranya LLDPE na LDPE.

Polyethylene ifite ubucucike buke, itandukanye mu miterere ya polyethylene ifite ubucucike buke, kuko nta mashami maremare y'uruhererekane abaho. Uburinganire bwa LLDPE buterwa n'uburyo butandukanye bwo gukora no gutunganya LLDPE na LDPE. LLDPE ikunze gukorwa na copolymerization ya ethylene na alpha olefini nyinshi nka butene, hexene cyangwa octene ku bushyuhe n'umuvuduko biri hasi. Polymer ya LLDPE ikorwa na copolymerization ifite uburemere buto bwa molekile ugereranyije na LDPE rusange, kandi icyarimwe ifite imiterere igororotse ituma igira imiterere itandukanye ya rheological.

Imiterere y'amazi ashongeshejwe

Imiterere y'amazi ashongeshwa ya LLDPE ijyanye n'ibisabwa mu buryo bushya, cyane cyane uburyo bwo gusohora filime, bushobora gukora ibicuruzwa byiza bya LLDPE. LLDPE ikoreshwa mu masoko yose asanzwe yo gushushanya polyethylene. Imiterere yoroshye yo kunanura, kwinjira, ingaruka no kurwanya amarira bituma LLDPE ikwiriye amafirime. Irwanya cyane ibidukikije, irwanya ingaruka nke no kurwanya imihindagurikire y'ikirere bituma LLDPE ikundwa cyane n'imiyoboro, ikoreshwa mu gusohora impapuro n'ibindi byose. Uburyo bushya bwo gukoresha LLDPE ni nk'ifumbire yo gutwikira imyanda n'imyanda mu byuzi by'imyanda.

Umusaruro n'Ibiranga

Ikorwa rya LLDPE ritangirira ku byuma bihindura imiterere, cyane cyane byo mu bwoko bwa Ziegler cyangwa Phillips. Imikorere mishya ishingiye kuri cycloolefin metal derivative catalysts ni ubundi buryo bwo gukora LLDPE. Uburyo nyabwo bwo gukora polymerization bushobora gukorwa muri solution na gaz phase reactors. Ubusanzwe, octene ikorwa na ethylene na butene muri solution phase reactor. Hexene na ethylene bikorwa muri gaz phase reactor. LLDPE resin ikorerwa muri gaz phase reactor iri mu buryo bw'uduce duto kandi ishobora kugurishwa nk'ifu cyangwa igatunganywamo utubumbe. Ubwoko bushya bwa super LLDPE bushingiye kuri hexene na octene bwakozwe na Mobile, Union Carbide. Ibigo nka Novacor na Dow Plastics byatangijwe. Ibi bikoresho bifite umupaka munini wo gukomera kandi bifite ubushobozi bushya bwo gukuramo imifuka mu buryo bwikora. Resin ya PE ifite ubucucike buke cyane (ubucucike buri munsi ya 0.910g/cc.) nayo yagaragaye mu myaka ya vuba aha. VLDPE ifite ubworoherane n'ubworoherane LLDPE idashobora kugeraho. Imiterere ya resin muri rusange igaragarira mu gushonga no mu bucucike. Igipimo cyo gushonga kigaragaza uburemere mpuzandengo bwa molekile ya resin kandi ahanini kigenzurwa n'ubushyuhe bw'ihinduka. Uburemere mpuzandengo bwa molekile ntibushingiye ku gukwirakwiza uburemere bwa molekile (MWD). Guhitamo catalyst bigira ingaruka kuri MWD. ​​Ubucucike bugenwa n'ubwinshi bwa comonomer mu muyoboro wa polyethylene. Igipimo cya comonomer kigenzura umubare w'amashami magufi y'imiyoboro (uburebure bwayo buterwa n'ubwoko bwa comonomer) bityo kikagenzura ubucucike bwa resin. Uko igipimo cya comonomer kiri hejuru, niko ubucucike bwa resin buba buke. Mu miterere, LLDPE itandukanye na LDPE mu mubare n'ubwoko bw'amashami, LDPE ifite umuvuduko mwinshi ifite amashami maremare, mu gihe LDPE ifite amashami magufi gusa.

gutunganya

LDPE na LLDPE byombi bifite rheology nziza cyangwa urujya n'uruza rw'amazi rushongesha. LLDPE ifite ubushobozi buke bwo gukata kubera ko ikwirakwira mu buremere bwayo buto ndetse n'amashami magufi y'imigozi. Mu gihe cyo gukata (urugero nko gukata), LLDPE igumana ubushobozi buke bwo gukata bityo ikaba igoye kuyitunganya kurusha LDPE ifite igipimo kimwe cyo gukata. Mu gukata, ubushobozi buke bwo gukata bwa LLDPE butuma imigozi ya molekile ya polymer iruhuka vuba, bityo bigatuma ubushobozi buke bwo kugabanya imiterere y'umubiri bugabanuka ku mpinduka mu gipimo cyo gukubita. Mu gukata, LLDPE irahinduka bitewe n'ubwoko butandukanye. Muri rusange ifite ubushobozi buke bwo gukata iyo irambuye nka LDPE. Yiyongera uko igipimo cya polyethylene kigenda gihinduka. LDPE igaragaza ukwiyongera gutangaje kwa viscosity, guterwa no gukata imigozi ya molekile. Iki kintu ntikigaragara muri LLDPE kuko kutagira amashami maremare y'imigozi muri LLDPE bituma polima idafatana. Iyi miterere ni ingenzi cyane ku ikoreshwa rya firime nto. Kubera ko firime za LLDPE zishobora gukora firime nto mu buryo bworoshye mugihe zigumana imbaraga nyinshi kandi zikomeye. Imiterere ya LLDPE mu mikorere ya rheological ishobora kuvugwa muri make nka "rigid in shear" na "yoroshye mu buryo bwagutse".