常用材料阻隔性能

1、常用材料阻隔性能阻隔性定義：一定厚度（1mm）的塑料制品，在一定的壓力（1mPa）、一定的溫度（23C）、一定的濕度，單位時(shí)間（24h）、單位面積（1nf）透過小分子物質(zhì)的體積或重量。阻隔性聚合物：國際上將O2透過率小于3.8cm3mm/24hm2mPa的聚合物稱為阻隔性聚合物。常用復(fù)合膜的阻隔性能復(fù)合膜結(jié)構(gòu)水汽透過率g/m2-24h氧氣透過率Cm2/m2-24h-0.1mPa保香性能48h備注PET/VMPET/PEBOPP/VMPET/PE2.010PET/AL/PE0.55KOP/CPP1.8711.8無香味泄露KPET/CPP2.226.9最好BOPP/CPP2.77480無保香功能P

2、ET/CPP3.5997明顯泄露PET/AL/PA/PE0.18-0.220.4-0.4512PET/38PP18.11113.5212PET/33PP22.08109.9225OPP/25CPP7.76783.0720OPP/20CPP10.41774.96OPP/VMCPP1.04OPP/珠光膜715.89PET/珠光膜96.95PA/EVOH-F/PP/PE0.845PP/EVOH-F/PP1.671PE/EVOH-F/PE0.873二、常用材料的阻隔性能表1:各種常見薄膜及相應(yīng)PVDC涂布膜阻隔性能比較薄膜類型BOPP20umBOPET12umLDPE70umBOPA15umPT24u

3、m未涂布5g/m2未涂布5g/m2未涂布5g/m2未涂布5g/m2未涂布5g/m2阻水性93.6354.571.521011非常大9阻氧性12008.560<52000<520<510-10002.5阻氮性600520<51000<515<5-阻CO2性320010050050120030020050-表2:不同涂層厚度的KOP阻隔性能對(duì)比涂層厚度（um）阻濕汽性能g/m2-24h-38C90%R阻氧氣性能HCm2/m2-24h-1atm22C1.55.022.13.03.68.54.52.44.5表3:塑料薄膜涂布PVDC前后性能比較項(xiàng)目OPPPETPA、

4、八刖后、八刖后、八刖后水分透過率g/m2-24h-38C90%4.7-7.04.7-6.2354.5372-40311氧氣cm2/壓透過率m2-25C40%f200012.4-7.8110540.35表4:三種材料的阻隔數(shù)據(jù)聚合物濕氧氣透過率23C透氧率變阻水（濕、潮）度Cm2-umrf-24h-kPa化性能PVA0%0.039非常差PVA95%97增大2487倍非常差EVOH(70%VOH)0%0.066非常差EVOH(70%VOH)95%12增大182倍非常差PA-60%5.8差PA-695%193.3倍差PVDC(90%VDC)0%0.97非常好PVDC(90%VDC)95%0.97無變

5、化非常好表5：鍍鋁膜的阻隔性能（市售鍍鋁膜鍍層厚度大約0.3um）鍍層厚度水蒸汽透過率g/m2-24h-40C100%RF氧氣透過率HCm2/-24h-atm12umPET25umCPP25umLDPE12umPET25umCPP25umLDPE0.22.11.32.245612000.40.60.60.71735340.60.30.30.6618121.00.30.30.331210表6:PVDC與其他薄膜阻隔性能對(duì)比項(xiàng)目水分透過率g/-24h-38C90%氧氣透過率cm2/m2-24h-25C40%t壓PVDC25u1.55-4.657.7-26.5PVA25u>50v0.2（濕度大

6、時(shí)透過量增大）KOP0.8-4.71.2-6.4BOPP4.7-6.21705CPP7.8-101300-6433BOPET20.278BOPA372-40340.3LDPE18.63375-13200HDPE4.7-10512-3275表7:常用中高阻透性塑料的透過系數(shù)項(xiàng)目氧氣透過率CO2透過率水分透過率Cm2-mm/24hnf-mPaCm2-mm/24hnf-mPag-mm/24hnfmPaEVOH（乙烯29%）0.11.520-25EVOH（乙烯38%）0.4640-70PVDC共聚物0.5-41.20.2-6PAN共聚物81650PEN12-22505-9MXD62-52815-30P

7、ET49-9018018-30項(xiàng)目一層共擠五層共擠三層共擠/涂表9:液奶包裝膜阻隔性能對(duì)比項(xiàng)目三層共擠五層共擠三層共擠/涂表8:常用薄膜的阻隔性能項(xiàng)目22uKOP15uKPET20uBOPP12uPET30uCPP透水性g/m2-d3.559.0354.0透氧性Cm2/m2-d1271200110800保香性(48h)無香味泄路最好無保香功能明顯泄路無保香功能PVDC透氧量cm2/tf-24h-0.1mPa20002325透CO2量cm2/m2-24h0.1mPa12000200200表10:常用材料阻隔性能比較性能從優(yōu)到劣比照阻氧氣性AL、MA-PVDC一EVOH一PVDC一PA一PET一PP一PE阻水汽性MA-PVDC一AL一PP一PE一PET一EVOH一PA氣味阻隔性MA-PVDC一AL一PET一PA一EVOH一PP一PEMA-PVDCPVDCEVOHPETPAPPHDPE耐化學(xué)性LLDPELDPEEVA保護(hù)隹MA-PVDCALEVOHPVDCPAPETPPPE表11:各種薄膜的保香性（單位：天）項(xiàng)目厚度（um）香草精天芥菜薄荷樟腦PE200000PVDC201113K-玻璃紙269810892防潮玻璃紙243152163164普通玻璃紙21657115378PVA膜20100107160165表12:各種薄膜的透明度和光澤度比較項(xiàng)目PVA玻璃紙