从2003~2005年LLDPE/LDPE的消费情况看,薄膜的消费比例一直保持在77%左右,第二大品种注塑制品的消费比例也一直在9%上下徘徊。预计未来2~3年内,各项品种的消费量将继续增长,但其消费比例会基本维持目前态势;由于包装膜的需求相对增长较快,农膜的消费比例将会降至20%左右。由于LLDPE的性能不断改善,其应用领域也不断扩大,未来市场对LLDPE的需求增速将大大高于LDPE和HDPE。
发展前景
在1984年末,当时的联碳公司引入了己烯共聚LLDPE的生产,紧随其后的是Exxon、Mobil等公司。DowChemical(陶氏化学公司)在其低压溶液工艺中几乎全部采用辛烯作为共聚单体,加拿大NOVA(诺瓦化工)也在其中压溶液工艺中大部分采用辛烯。辛烯共聚LLDPE树脂具有略好的强度、抗撕裂性能和加工性能,而己烯共聚和辛烯共聚树脂的性能差别不大。己烯LLDPE树脂的生产商主要有ExxonMobilChemical(埃克森美孚化工公司)、Eastman Chemical(伊士曼化学公司)、Equistar(等星公司)和Chevron Phillips(雪佛龙菲利普斯化学公司)等。Dow Chemical(陶氏化学公司)、Basell(巴塞尔公司)
Kusukela kwimekoyokusetyenziswa kweLLDPE/LDPE ukusuka kwi-2003 ukuya kwi-2005,umlinganiselo wokusetyenziswa kwemifanekiso emithambileyo ugcinwengamalunga ne-77%, kwaye umlinganiselo wokusetyenziswa kwesibiniubukhulu bohlobo lwemiphumela emithambileyo esetyenziswangokujikeleza kwi-9%. Kulindelekile ukuba kwiminyaka emibini ukuyakwisithathu esilandelayo, nangona ukutyeba kwezihlobo ezahlukeneyokuya kuqhubeka ukunyuka, umlinganiselo wokuthatha kwawo uya kugcinaumlinganiselo wangoku; Ngenxa yokukhula okukhawulezayongokukhawulezayo kwimfuno yokufaka imifanekiso yokufakaimifanekiso, umlinganiselo wokusetyenziswa kwemifanekiso yezolimiuya kunciphisa ukuya kuma-20%. Ngenxa yokuphucula kokuqhubekekakwemisebenzi ye-LLDPE kunye nokukhulisa kwezindawo zayozokusebenza, ukufuna kwemarketi elizayo kweLLDPE kuzakukhulakakhulu kakhulu kune-LDPE ne-HDPE.
Iziphumo zophuhliso
Ekupheleni kwe-1984, iUnitedCarbon Corporation yamisa ukuveliswa kwe-LLDPE copolymerizationnehexene, elandela kufutshane ngeemphathi ezifana ne-Exxonne-Mobil. I-Dow Chemical isebenzisa i-octene ngokupheleleyonjenge-comonomer kwinkqubo yokusombululo yoxinzelelo oluphantsikwaye iNova Chemical yaseCanada isebenzisa i-octene kwinkquboyokusombululo yoxinzelelo oluphakathi kwayo. Octene copolymer LLDPEresin has slightly better strength, tear resistance, andprocessability, while the performance difference between hexenecopolymer and octene copolymer resin is not significant. Abavelisiabakhulu behexene LLDPE abaquka iExxonMobil Chemical, EastmanChemical, Equistar, neChevron Phillips. Ukongeza, iDow ChemicalneBasell