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,虽然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。Dow Chemical(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ExxonMobil Chemical(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。此外,Dow Chemical(陶氏化学公司)、basell(巴塞尔公司)
Kusukela kwimeko yokusetyenziswa kweLLDPE/LDPE ukusuka kwi-2003 ukuya kwi-2005, umlinganiselo wokusetyenziswa kwemifanekiso emithambileyo ugcinwe ngamalunga ne-77%, kwaye umlinganiselo wokusetyenziswa kwesibini ubukhulu bohlobo lwemiphumela emithambileyo esetyenziswa ngokujikeleza kwi-9%. Kulindelekile ukuba kwiminyaka emibini ukuya kwisithathu esilandelayo, nangona ukutyeba kwezihlobo ezahlukeneyo kuya kuqhubeka ukunyuka, umlinganiselo wokuthatha kwawo uya kugcina umlinganiselo wangoku; Ngenxa yokukhula okukhawulezayo ngokukhawulezayo kwimfuno yokufaka imifanekiso yokufaka imifanekiso, umlinganiselo wokusetyenziswa kwemifanekiso yezolimi uya kunciphisa ukuya kuma-20%. Ngenxa yokuphucula kokuqhubekeka kwemisebenzi ye-LLDPE kunye nokukhulisa kwezindawo zayo zokusebenza, ukufuna kwemarketi elizayo kweLLDPE kuzakukhula kakhulu kakhulu kune-LDPE ne-HDPE.
Iziphumo zophuhliso
Ekupheleni kwe-1984, iUnited Carbon Corporation yamisa ukuveliswa kwe-LLDPE copolymerization nehexene, elandela kufutshane ngeemphathi ezifana ne-Exxon ne-Mobil. I-Dow Chemical isebenzisa i-octene ngokupheleleyo njenge-comonomer kwinkqubo yokusombululo yoxinzelelo oluphantsi kwaye iNova Chemical yaseCanada isebenzisa i-octene kwinkqubo yokusombululo yoxinzelelo oluphakathi kwayo. Octene copolymer LLDPE resin has slightly better strength, tear resistance, and processability, while the performance difference between hexene copolymer and octene copolymer resin is not significant. Abavelisi abakhulu behexene LLDPE abaquka iExxonMobil Chemical, Eastman Chemical, Equistar, neChevron Phillips. Ukongeza, iDow Chemical nebasell