CN111300934A - 聚烯烃自粘重包装膜及其制备方法 - Google Patents
聚烯烃自粘重包装膜及其制备方法 Download PDFInfo
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Abstract
本发明属于塑料包装技术领域,具体的涉及一种聚烯烃自粘重包装膜及其制备方法。由内层、中层和外层复合而成,以三层复合的原料的平均质量份数计,由茂金属线性聚乙烯40‑80份、低密度线性聚乙烯15‑30份、低密度聚乙烯5‑15份、热塑性弹性体10‑30份、耐老化母料3‑5份和色母料1‑3份组成。本发明所述的聚烯烃自粘重包装膜具有优异的力学性能、卓越的拉伸强度、抗穿刺、抗撕裂和抗冲击性能。
Description
技术领域
本发明属于塑料包装技术领域,具体的涉及一种聚烯烃自粘重包装膜及其制备方法。
背景技术
聚烯烃自粘重包装膜具有优越的力学性能、极高的抗拉伸强度和抗应力变形性能,优异的抗穿刺、抗撕裂性能,并且具有包装吨以上物品后自粘封口的功能,可在-30℃-40℃的环境条件下使用,不降低其自粘性能,是一种干货物重包装的新柔性材料。目前广泛应用于机械自动化采棉机配套来包装棉花,以及其它农机自动化农作物的收割包装、大宗工业品、机器、无纺织品的包装等领域。但在实际应用中,现有技术生产的聚烯烃自粘重包装膜仍然存在一些问题。
由于原料、配方及制备过程、工艺技术的差异,国产聚烯烃自粘重包装膜普遍存在拉伸强度较低、自粘封包搭接剥离力低的缺陷,尤其是当包装量达到2吨重时,出现张力大撑破包装膜的问题,关键的是自粘性能差,封口后的膜搭接剥离力低易出现散包,在-25℃~40℃环境条件下使用稳定性差,不适应于大温差工作条件的情况使用。目前在新疆自动采棉配套使用的包装膜全部由美国进口。
发明内容
本发明要解决的技术问题是:提供一种聚烯烃自粘重包装膜,具有优异的力学性能、卓越的拉伸强度、抗穿刺、抗撕裂和抗冲击性能;本发明同时提供了其制备方法。
本发明所述的聚烯烃自粘重包装膜,由内层、中层和外层复合而成,以三层复合的原料的平均质量份数计,组成如下:
作为一个优选的技术方案,本发明所述的聚烯烃自粘重包装膜,由内层、中层和外层复合而成,以三层复合的原料的平均质量份数计,组成如下:
其中:
内层原料由茂金属线性聚乙烯、低密度线性聚乙烯、低密度聚乙烯和耐老化母料组成。
中层原料由茂金属线性聚乙烯、低密度线性聚乙烯、低密度聚乙烯、耐老化母料和色母料组成;色母料仅加在了中层是为了防止析出,影响搭接、粘接强度。
外层(粘层)原料由茂金属线性聚乙烯和热塑性弹性体组成;主要是确保粘接性能和加工操作过程的可行性。
本发明所述的聚烯烃自粘重包装膜,厚度为0.06-0.12mm,优选厚度为0.075mm;内层:中层:外层的厚度比为1-1.2:0.8-1.0:1.0-1.2,优选厚度比为:内层:中层:外层=1:1:1。
茂金属线性聚乙烯(以下简称m-LLDPE)的密度为0.912-0.920g/cm3,熔融指数为0.5-1.0g/10min。
优选的,茂金属线性聚乙烯是埃奇得1018系列(1018MA)、1012系列(1012MA)、XP6056、埃能宝2010系列或埃能宝2005系列中的任何一种或两种以上配合。
埃奇得1018系列(1018MA)、1012系列(1012MA)、XP6056、埃能宝2010系列和埃能宝2005的生产厂家均为埃克森美孚公司。
茂金属线性聚乙烯的主要作用是提高聚烯烃自粘重包装膜的力学性能,优异的双向均衡提高拉伸强度、抗穿刺性能、抗撕裂性能、抗冲击性能,改善产品的抗污染性能,改进熔体强度及加工性。
低密度线性聚乙烯(LLDPE)的密度为0.918-0.926g/cm3,熔融指数为0.8-1.0g/10min。
优选的,低密度线性聚乙烯是1001系列(1001av)、9085、7047或2045G中的任何一种。
1001系列的生产厂家为埃克森美孚公司,9085和7047的生产厂家为天津联碳,2045G的生产厂家为陶氏化学。
低密度线性聚乙烯的主要作用是提高聚烯烃自粘重包装膜的力学性能、拉伸强度、抗拉伸应变能力、抗穿刺性能以及抗撕裂性能。
低密度聚乙烯(LDPE)的密度为0.920-0.923g/cm3,熔融指数为0.2-0.5g/10min。
优选的,低密度聚乙烯是2100TN00、2420D、LD163或LD165中的任何一种。
2100TN00的生产厂家为齐鲁石化,2420D的生产厂家为大庆石化,LD163和LD165的生产厂家为北京燕山。
低密度聚乙烯的主要作用是提高聚烯烃自粘重包装膜的熔体强度以及稳定加工性能。
热塑性弹性体(SEBS)的密度为0.910-0.920g/cm3,熔融指数为5.0-8.0g/10min,邵氏硬度30-70。
优选的,热塑性弹性体是MD6945、G-1650、G-1642、G-1660、1606A或6026A中的任何一种。
MD6945、G-1650、G-1642、G-1660、1606A和6026A的生产厂家均为美国科腾公司。
热塑性弹性体的主要作用是作为高档弹性体胶黏剂来改善聚烯烃自粘重包装膜的低温粘着剥离强度,提高低温柔性,而且SEBS与聚乙烯有良好的共混相容性,加工性能好,具有优异的耐老化性能,高温条件下稳定性好,无低聚物析出,低温条件下自粘强度不降低,可以确保产品在-30℃-40℃的环境中使用的稳定安全性。
耐老化母料是受阻胺光稳定剂与抗氧剂复配的耐老化体系。
受阻胺光稳定剂是HS-362、HS-944或HS962中的任何一种。
HS-362、HS-944和HS962的生产厂家均为北京天罡助剂公司。
抗氧剂是B215或B225中的任何一种。
B215和B225的生产厂家均为天津利安隆公司。
耐老化母料的主要作用是提高聚烯烃自粘重包装膜加工过程抗高温热氧化的性能,稳定加工性能并延长膜的使用寿命。
色母料可依据市场所需的色相而选择变化,如黄色母料,无特定要求。
本发明所述的聚烯烃自粘重包装膜,厚度为0.06-0.12mm,优选厚度为0.075mm。
本发明所述的聚烯烃自粘重包装膜,应用于自动采棉机配套来包装棉花,替代进口产品。
本发明所述的聚烯烃自粘重包装膜的制备方法,由以下步骤组成:
以茂金属线性聚乙烯、低密度线性聚乙烯、低密度聚乙烯为原料,加入热塑性弹性体、耐老化母料和色母料,混合均匀后,经三层共挤吹塑设备剪切、熔融塑化、挤出模口,经空气吹胀、冷却定型、牵引、刨开、切边、卷取,得到聚烯烃自粘重包装膜。
其中:
所述的制造设备为三层共挤挤出机,型号为SJ90*3,挤出机螺杆长径比为28-30:1,优选30:1,模头直径700-1000mm,口模间隙为1.8-2.1mm,优选2.1mm。
三层共挤挤出机各段温度设定范围为170-220℃,其中:一区170℃、二区200℃、三区220℃、四区220℃、连接体温度215℃、模头温度205-210℃;挤出机螺杆转速为35-45r/min。
本发明与现有技术相比,具有以下有益效果:
(1)本发明所述的聚烯烃自粘重包装膜,各项性能检测全部优于进口美国的同类产品指标,具有优异的力学性能、卓越的拉伸强度、抗穿刺、抗撕裂、抗冲击性能,在-30℃-40℃条件下包装2吨以上的棉花包裹膜的自粘封闭搭接剥离强度高,完全解决了国产膜低温0℃条件下散包、破包的问题,完全可以替代进口产品。目前已提供50吨聚烯烃自粘重包装膜,应用于澳大利亚690型自动采棉机配套包装,每个棉花包裹重量2吨;并且大大提高了产品的耐老化性,使用寿命可达18个月,为农业机械化、自动化的实施降低了成本;与进口产品相比每吨膜至少可以节省成本1万元。
(2)本发明所述的聚烯烃自粘重包装膜,提高了原料中茂金属线性聚乙烯的平均质量份数,现有技术中茂金属线性聚乙烯采用30-38份,本发明的配方采用的是50-70份;同时降低了低密度线性聚乙烯的平均质量份数,现有技术中低密度线性聚乙烯平均质量份数采用50-70份,本发明的配方采用的平均质量份数是20-25份,以上两种原料的配比平均质量份数变化,提高了产品的拉伸强度25%,提高了抗穿刺、抗撕裂、抗冲击性能,力学性能指标超越了美国进口的产品。
(3)本发明所述的聚烯烃自粘重包装膜,在粘层(加工时膜的外层)中采用了热塑性弹性体(SEBS)为增粘剂,这是本发明配方的关键点,SEBS作为高档胶黏剂加入到膜的外层中,与聚乙烯相容性好,加工性好,在40℃高温条件下稳定性好,无低聚物析出,在-30℃低温条件下自粘强度不降低,膜的搭接剥离力达到20N左右,与美国进口膜的搭接剥离力等同;而现有常规技术在粘层中使用的增粘剂是牌号为1300、2400的PIB聚异丁烯,膜的搭接剥离力只有5-7N,达不到棉花包裹重2吨的包装要求,在自动采棉机实验棉花包装过程中出现破包、开包被淘汰。PIB与SEBS相比较,其一胶粘性能有数量级的差别,其二是PIB的耐候性差,25℃以上的环境下低聚物析出多,使粘膜面油腻,降低了搭接剥离力,0℃以下的环境中粘性急剧下降,搭接剥离力只有3-4N,达不到重包装自粘的指标要求。
(4)本发明所述的聚烯烃自粘重包装膜,增加了耐老化母料,而现有常规技术未加耐老化母料,本发明的配方采用3-5份耐老化母料,主要是提高膜的耐热抗氧化性能,延长使用寿命可达18个月,方便回收,利于环保。
(5)本发明所述的聚烯烃自粘重包装膜的制备方法,与现有技术相比在选择相同型号的加工设备上生产,由于配方和原料有差异,挤出机各段的加工温度有改变,本发明设定的温度是:170-220℃,常规工艺使用温度是160-205℃。本发明的关键工艺改进点是聚烯烃自粘重包装膜的三层配方设计及工艺条件设置,以及粘层厚度的控制,挤出机各段温度设定:170℃、200℃、220℃、220℃;连接体温度设定为215℃,模头温度设定205-210℃;制品厚度优选为0.075mm。常规技术制品的层厚比为内层1:中层1.2:外层0.8(即0.025/0.030/0.020mm),为了减少PIB中低聚物的析出,PIB分两层投入,并减少了外(粘)层的厚度20%。
(6)本发明的聚烯烃自粘重包装膜采用的层厚比(内层:中层:外层)是内层1-1.2:中层0.8-1.0:外层1.0-1.2,采用的增粘剂SEBS的加工温度与聚乙烯相当,而且增粘剂只投入到外层中,关键是SEBS的胶粘性高、耐候性好,其粘性受温度变化的影响非常小,稳定提高了产品的粘层搭接剥离力,并确保产品的力学性能指标、粘接性能达到美国进口产品的技术水平。
具体实施方式
以下结合实施例对本发明作进一步描述。
实施例1
本实施例1所述的聚烯烃自粘重包装膜,由内层、中层和外层组成,各层的原料配比如下表1所示:
表1 实施例1聚烯烃自粘重包装膜原料配比表
本实施例1所述的聚烯烃自粘重包装膜的制备方法,由以下步骤组成:
将以上原料按配方称量,分层投入混料机中混合30分钟后,经自动上料机送入对应的三层共挤吹塑设备的内层、中层、外层料斗中,挤出机各段温度设定:170℃、200℃、220℃、220℃;连接体温度设定为215℃,模头温度设定210℃;挤出机螺杆长径比30:1;模头间隙2.1mm;螺杆转速40-45转/分,制品厚度为0.075mm,制品的层厚比为1:1:1。
原料进入挤出机后,经剪切、熔融、塑化从圆环形模口挤出,经过空气吹胀,冷却定型成管状膜筒,再经过牵引、剖开、切边、调整好规格尺寸,卷取成产品。样品检测结果详见附表6。
实施例2
本实施例2所述的聚烯烃自粘重包装膜,由内层、中层和外层组成,各层的原料配比如下表2所示:
表2 实施例2聚烯烃自粘重包装膜原料配比表
本实施例2所述的聚烯烃自粘重包装膜的制备方法,由以下步骤组成:
将以上原料按配方称量,分层投入混料机中混合30分钟后,经自动上料机送入对应的三层共挤吹塑设备的内层、中层、外层料斗中,挤出机各段温度设定:170℃、200℃、220℃、220℃;连接体温度设定为215℃,模头温度设定210℃;挤出机螺杆长径比30:1;模头间隙2.1mm;螺杆转速40-45转/分,制品厚度为0.075mm,制品的层厚比为1:1:1。
原料进入挤出机后,经剪切、熔融、塑化从圆环形模口挤出,经过空气吹胀,冷却定型成管状膜筒,再经过牵引、剖开、切边、调整好规格尺寸,卷取成产品。样品检测结果详见附表6。
实施例3
本实施例3所述的聚烯烃自粘重包装膜,由内层、中层和外层组成,各层的原料配比如下表3所示:
表3 实施例3聚烯烃自粘重包装膜原料配比表
本实施例3所述的聚烯烃自粘重包装膜的制备方法,由以下步骤组成:
将以上原料按配方称量,分层投入混料机中混合30分钟后,经自动上料机送入对应的三层共挤吹塑设备的内层、中层、外层料斗中,挤出机各段温度设定:170℃、200℃、220℃、220℃;连接体温度设定为215℃,模头温度设定210℃;挤出机螺杆长径比30:1;模头间隙2.1mm;螺杆转速40-45转/分,制品厚度为0.075mm,制品的层厚比为1:1:1。
原料进入挤出机后,经剪切、熔融、塑化、从圆环形模口挤出,经过空气吹胀,冷却定型成管状膜筒,再经过牵引、剖开、切边、调整好规格尺寸,卷取成产品。样品检测结果详见附表6。
对比例1
对比例1所述的聚烯烃自粘重包装膜,由内层、中层和外层组成,各层的原料配比如下表4所示:
表4 对比例1聚烯烃自粘重包装膜原料配比表
对比例1所述的聚烯烃自粘重包装膜的制备方法,由以下步骤组成:
将以上原料按配方称量,分层投入混料机中混合30分钟后,经自动上料机送入对应的三层共挤吹塑设备的内层、中层、外层料斗中,挤出机三层各段温度设定:160℃、190℃、205℃、205℃,连接体温度设定为215℃,模头温度设定210℃;挤出机螺杆长径比30:1;模头间隙2.1mm;螺杆转速40-45转/分),制品厚度为0.075mm,制品的层厚比为1:1:1。
原料进入挤出机后,经剪切、熔融、塑化、从圆环形模口挤出,经过空气吹胀,冷却定型成管状膜筒,再经过牵引、剖开、切边、调整好规格尺寸,卷取成产品。样品检测结果详见附表6。
对比例2
对比例2所述的聚烯烃自粘重包装膜,由内层、中层和外层组成,各层的原料配比如下表5所示:
表5 对比例2聚烯烃自粘重包装膜原料配比表
对比例2所述的聚烯烃自粘重包装膜的制备方法,由以下步骤组成:
将以上原料按配方称量,分层投入混料机中混合30分钟后,经自动上料机送入对应的三层共挤吹塑设备的内层、中层、外层料斗中。按原有常规技术挤出机三层各段温度设各段温度设定:160℃、180℃、200℃、200℃,连接体温度设定为205℃,模头温度设定205℃;挤出机螺杆长径比30:1;模头间隙2.1mm;螺杆转速35-45转/分,制品厚度为0.075mm,制品的层厚比为内层1:中层1.2:外层0.8。(即0.025/0.030/0.020mm,减少了粘层的厚度20%),样品检测结果详见表6。
将实施例1-3和对比例1-2制备的膜进行性能测试,试验品规格为宽度2.75M,厚度0.075mm,自粘性技术指标根据GB10457-2009食品用塑料自粘保鲜膜中规定的试验方法测定;厚度及偏差、力学性能技术指标按QB/T4474-2013集装箱液体运输用聚乙烯内衬袋膜中规定的试验方法进行测定,测试结果如附表6所示。
表6 实施例1-3和对比例1-2制备的聚烯烃自粘重包装膜性能测试结果
对比例1采用的是现有技术中的配方,从性能检测结果可以看出,包装膜的力学性能和粘接性均大大降低。对比例2原料配方与实施例1相当,但是采用原有工艺条件制得,从性能检测结果可以看出,包装膜的粘接性大大降低。
三个实施例的测试结果数据验证了,本发明聚烯烃自粘重包装膜的各项性能指标与美国进口的样品性能相当,三例实施样品的力学性能指标、粘接性能均达到并超过了美国进口产品的技术水平。
Claims (9)
2.根据权利要求1所述的聚烯烃自粘重包装膜,其特征在于:内层原料由茂金属线性聚乙烯、低密度线性聚乙烯、低密度聚乙烯和耐老化母料组成;中层原料由茂金属线性聚乙烯、低密度线性聚乙烯、低密度聚乙烯、耐老化母料和色母料组成;外层原料由茂金属线性聚乙烯和热塑性弹性体组成。
3.根据权利要求1所述的聚烯烃自粘重包装膜,其特征在于:茂金属线性聚乙烯的密度为0.912-0.920g/cm3,熔融指数为0.5-1.0g/10min;低密度线性聚乙烯的密度为0.918-0.926g/cm3,熔融指数为0.8-1.0g/10min。
4.根据权利要求3所述的聚烯烃自粘重包装膜,其特征在于:茂金属线性聚乙烯是埃奇得1018系列、1012系列、XP6056、埃能宝2010系列或埃能宝2005系列中的任何一种或两种以上配合;低密度线性聚乙烯是1001系列、9085、7047或2045G中的任何一种。
5.根据权利要求1所述的聚烯烃自粘重包装膜,其特征在于:低密度聚乙烯的密度为0.920-0.923g/cm3,熔融指数为0.2-0.5g/10min;热塑性弹性体的密度为0.910-0.920g/cm3,熔融指数为5.0-8.0g/10min,邵氏硬度30-70。
6.根据权利要求5所述的聚烯烃自粘重包装膜,其特征在于:低密度聚乙烯是2100TN00、2420D、LD163或LD165中的任何一种;热塑性弹性体是MD6945、G-1650、G-1642、G-1660、1606A或6026A中的任何一种。
7.根据权利要求1所述的聚烯烃自粘重包装膜,其特征在于:耐老化母料是受阻胺光稳定剂与抗氧剂复配的耐老化体系。
8.根据权利要求7所述的聚烯烃自粘重包装膜,其特征在于:受阻胺光稳定剂是HS-362、HS-944或HS962中的任何一种;抗氧剂是B215或B225中的任何一种。
9.一种权利要求1所述的聚烯烃自粘重包装膜的制备方法,其特征在于:以茂金属线性聚乙烯、低密度线性聚乙烯、低密度聚乙烯为原料,加入热塑性弹性体、耐老化母料和色母料,混合均匀后,经三层共挤吹塑设备剪切、熔融塑化、挤出模口,经空气吹胀、冷却定型、牵引、刨开、切边、卷取,得到聚烯烃自粘重包装膜。
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