材料阻隔性能

1、-/常用资料间隔性能间隔性定义：必然厚度（1）的塑料制品，在必然的压力（1mPa）、必然的温度（23）、必然的湿度，单位时间（24h）、单位面积（1）内透过小分子物质的体积或重量。间隔性聚合物：国际大将O2透过率小于323.8cmmm/24hmmPa的聚合物称为间隔性聚合物。一、常用复合膜的间隔性能复合膜结构水汽透过率氧气透过率保香性能备g/24hC/24h0.1mPa48h注PET/VMPET/PE2.010BOPP/VMPET/PEPET/AL/PE0.55KOP/CPP1.8711.8无香味泄露KPET/CPP2.226.9最好BOPP/CPP2.77480无保香功能PET/CPP3.5

2、997明显泄露PET/AL/PA/PE12PET/38PP18.11113.5212PET/PP22.08109.923325OPP/25CPP7.76783.0720OPP/20CPP10.41774.96OPP/VMCPP1.04-/OPP/珠光膜715.89PET/珠光膜96.95PA/EVOH-F/PP/PE0.845PP/EVOH-F1.671/PPPE/EVOH-F/PE0.873-/二、常用资料的间隔性能表1：各种常有薄膜及相应PVDC涂布膜间隔性能比较薄膜BOPP20umBOPET12umLDPE70umBOPA15umPT24um种类未涂5g/未涂5g/未涂5g/未涂5g/未

3、涂布5g/布布布布阻水性93.6354.571.521011特别大9阻氧性12008.56052000520510-10002.5阻氮性600520510005155-阻CO2320010050050120030020050-性表2：不同样涂层厚度的KOP间隔性能比较涂层厚度（um）阻湿汽性能阻氧气性能g/24h3890%RHC/24h1atm221.55.022.13.03.68.54.52.44.5表3：塑料薄膜涂布PVDC前后性能比较项目OPPPETPA前后前后前后水分透过率354.5372-40311g/24h3890%氧气透过率2000110540.35-/2540%常压表4：三种资

4、料的间隔数据聚合物湿氧气透过率23透氧率变阻水（湿、潮）度Cum/24hkPa化性能PVA0%0.039-特别差PVA95%97增大2487特别差倍EVOH(70%VOH)0%0.066-特别差EVOH(70%VOH)95%12增大182特别差倍PA-60%5.8-差PA-695%193.3倍差PVDC(90%VDC)0%0.97-特别好PVDC(90%VDC)95%0.97无变化特别好表5：镀铝膜的间隔性能（市售镀铝膜镀层厚度大体0.3um）镀层水蒸汽透过率氧气透过率厚度g/24h40100%RHC/24hatm12umPET25umCPP25umLDPE12umPET25umCPP25um

5、LDPE0.22.11.32.24561200-/0.40.60.60.71735340.60.30.30.6618121.00.30.30.331210表6：PVDC与其他薄膜间隔性能比较项目水分透过率g/24h3890%氧气透过率c/24h2540%常压PVDC25uPVA500.2（湿度大时透过分增大）25uKOPBOPP1705CPP7.8-101300-6433BOPET20.278BOPA372-40340.3LDPE18.63375-13200HDPE4.7-10512-3275表7：常用中高阻透性塑料的透过系数项目氧气透过率CO2透过率水分透过率Cmm/24hmPaCmm/24

6、hmPagmm/24hmPaEVOH（乙烯29%）0.11.520-25-/EVOH（乙烯38%）0.4640-70PVDC共聚物0.5-41.20.2-6PAN共聚物81650PEN12-22505-9MXD62-52815-30PET49-9018018-30表8：常用薄膜的间隔性能项目22uKOP15uKPET20uBOPP12uPET30uCPP透水性g/3.559.0354.0d透氧性C/1271200110800d保香性(48h)无香味泄最好无保香功明显泄无保香功露能露能表9：液奶包装膜间隔性能比较项目三层共挤五层共挤三层共挤/涂PVDC透氧量c/24h0.1mPa20002325

7、透CO2量c/24h0.1mPa12000200200表10：常用资料间隔性能比较性能从优到劣对照-/阻氧气性AL、MA-PVDCEVOHPVDCPAPETPPPE阻水汽性MA-PVDCALPPPEPETEVOHPA气味间隔性MA-PVDCALPETPAEVOHPPPEMA-PVDCPVDCEVOHPETPAPPHDPELLDPE耐化学LDPEEVA性保护性MA-PVDCALEVOHPVDCPAPETPPPE表11：各种薄膜的保香性（单位：天）项目厚度（um）香草精天芥菜薄荷樟脑PE200000PVDC201113K-玻璃纸269810892防潮玻璃纸243152163164一般玻璃纸21657115378PVA膜20100107160165表12：各种薄膜的透明度和光彩度比较项目PVA玻璃纸PVCPET