Kugereranya kwa LLDPE na LDPE.

Umurongo muke wa polyethylene, muburyo butandukanye nuburyo rusange buke buke polyethylene, kuko ntamashami maremare afite. Umurongo wa LLDPE biterwa nuburyo butandukanye bwo gutunganya no gutunganya LLDPE na LDPE. LLDPE isanzwe ikorwa na copolymerisation ya Ethylene na alpha olefine yo hejuru nka butene, hexene cyangwa octene mubushyuhe buke n'umuvuduko. Polimeri ya LLDPE yakozwe na kopolymerisation ifite uburemere buke bwa molekile ikwirakwizwa kuruta LDPE rusange, kandi icyarimwe ifite imiterere y'umurongo ituma igira imiterere itandukanye.

gushonga ibintu

Ibiranga gushonga biranga LLDPE byahujwe nibisabwa muri gahunda nshya, cyane cyane uburyo bwo gukuramo firime, bushobora kubyara ibicuruzwa byiza bya LLDPE. LLDPE ikoreshwa mumasoko yose gakondo ya polyethylene. Kuzamura kurambura, kwinjira, ingaruka no kurwanya amarira bituma LLDPE ibera firime. Kurwanya kwiza kwangiza ibidukikije, kurwanya ubushyuhe buke no guhangana nintambara bituma LLDPE ishimisha imiyoboro, gusohora impapuro hamwe nibisabwa byose. Porogaramu iheruka ya LLDPE ni nk'igiti cyo kumena imyanda no gutondekanya ibyuzi.

Umusaruro n'ibiranga

Umusaruro wa LLDPE utangirana ninzibacyuho yicyuma, cyane cyane ubwoko bwa Ziegler cyangwa Phillips. Inzira nshya zishingiye kuri cycloolefin ibyuma biva mu mahanga ni ubundi buryo bwo gukora LLDPE. Imyitozo nyayo ya polymerisiyasi irashobora gukorwa mubisubizo hamwe na reaction ya feri ya gaze.Ubusanzwe, octene ikoporora hamwe na Ethylene na butene mumashanyarazi yicyiciro. Hexene na Ethylene bifite polymerize mumashanyarazi ya gaze. Ibisigazwa bya LLDPE byakozwe mubyuma bya gaze ya gazi biri mubice kandi birashobora kugurishwa nkifu cyangwa bigatunganyirizwa muri pellet. Igisekuru gishya cya super LLDPE gishingiye kuri hexene na octene cyakozwe na Mobile, Union Carbide. Ibigo nka Novacor na Dow Plastike byatangijwe. Ibi bikoresho bifite imipaka nini yo gukomera kandi bifite ubushobozi bushya bwo gukuraho amashashi mu buryo bwikora. Ubucucike buke cyane PE resin (ubucucike buri munsi ya 0.910g / cc.) Nabwo bwagaragaye mumyaka yashize. VLDPES ifite guhinduka no koroshya LLDPE idashobora kugeraho. Ibiranga resin bigaragarira mubisanzwe gushonga nubucucike. Icyerekezo gishonga cyerekana uburemere bwa molekuline yuburemere kandi bigenzurwa cyane nubushyuhe bwa reaction. Impuzandengo yuburemere bwa molekuline ntigengwa no gukwirakwiza uburemere bwa molekile (MWD). Guhitamo catalizator bigira ingaruka kuri MWD. Ubucucike bugenwa nubunini bwa comonomer mumurongo wa polyethylene. Ihuriro rya comonomer rigenzura umubare wamashami magufi (uburebure bwacyo biterwa nubwoko bwa comonomer) bityo bikagenzura ubwinshi bwa resin. Iyo hejuru ya comonomer yibanze, niko umubyimba wa resin ugabanuka. Mu buryo, LLDPE itandukanye na LDPE mumibare nubwoko bwamashami, umuvuduko mwinshi LDPE ufite amashami maremare, mugihe umurongo LDPE ufite amashami magufi gusa.

gutunganya

LDPE na LLDPE byombi bifite imvugo nziza cyangwa gushonga. LLDPE ifite ubukana buke kubera kugabanuka kwinshi kwa molekuline no kugabana amashami magufi. Mugihe cyo kogosha (urugero nko gukuramo), LLDPE igumana ubwiza bwinshi bityo rero biragoye kuyitunganya kuruta LDPE hamwe nigipimo kimwe cyo gushonga. Muri extrusion, shear sensibilité ya LLDPE ituma imihangayiko yorohereza iminyururu ya polymer, bityo bikagabanuka kubyunvikana kumubiri kumihindagurikire yikigereranyo. Mu kwaguka gushonga, LLDPE iratandukana muburyo butandukanye Mubisanzwe bifite ubukonje buke kumuvuduko. Nukuvuga, ntabwo bizagora gukomera iyo birambuye nka LDPE. Ongera hamwe nigipimo cyo guhindura polyethylene. LDPE yerekana kwiyongera gutangaje kwijimye, biterwa no gufunga iminyururu ya molekile. Iyi phenomenon ntabwo igaragara muri LLDPE kuko kubura amashami maremare muri LLDPE bituma polymer itishora. Uyu mutungo ningirakamaro cyane kubikorwa bya firime yoroheje. Kuberako firime ya LLDPE irashobora gukora byoroshye firime yoroheje mugihe ikomeje imbaraga nyinshi no gukomera. Imiterere ya rheologiya ya LLDPE irashobora kuvugwa muri make nk "gukomera mu kogosha" na "byoroshye mu kwagura".