CN103980604A - 一种耐温型爽滑pe膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种耐温型爽滑PE膜,其是采用以重量百分比计算的低密度聚乙烯40%~50%、高密度聚乙烯1.3%~1.6%、线性低密度聚乙烯47%-57%、开口剂1%~1.4%,经过混炼机中充分混合、挤压机中挤压成型、冷却制备而成。本发明所述的耐温型爽滑PE膜,具有良好的爽滑效果,同时保持膜的摩擦系数保持稳定,避免复合熟化后制袋会出现的袋子难以打开的现象。
Description
技术领域
本发明涉及包装材料技术领域,具体涉及一种耐温型爽滑PE膜及其制备方法。
背景技术
产品包装一般地说就是给生产的产品装箱、装盒、装袋、包裹、捆扎的等工作。包装的方式方法多种多样,目前一种简单有效的包装方式是用包装膜对产品或货物进行缠绕包装,使包装物稳固整洁,广泛在外贸出口、造纸、五金、塑料化工、建材、食品医药行业,尤其是在不规则形体物品的组合式包装方面。包装膜采用收缩包装的优点是:1.适应于包装各种形状的商品,增加产品外观吸引力;2.薄膜能够紧贴商品,具有透明性,外形美观,清洁亮丽;3.包装好的商品具有卫生性、保洁性,密封包装,防尘阻湿;4.收缩包装具有良好的防震撞性、防冲击性、以及良好的保护性能;5.被包装的商品具有紧密性和固定性,小部件不会在包装中东倒西歪;6.热收缩膜也可用于代替各类纸盒,尤其是在不规则形体物品或商品的组合式(集束)包装方面,不但节约包装成本,而且符合包装潮流。
现有的包装膜主要是由多种聚乙烯树脂混合挤出而成的PE膜,其具有抗穿刺,超强度高性能,主要是应用于复合包装膜中的底层薄膜。现有PE膜多是采用低密度聚乙烯(LDPE)及其它爽滑剂助剂混合成型的。这些常用的含爽滑剂成份的PE膜均存在一大缺陷,就是经高温条件后(如60℃)爽滑度会发生严重的下滑,摩擦系数大大增加,用其复合熟化后制袋会出现袋子打不开等现象,造成损失。
发明内容
为克服现有技术的缺陷,本发明的在于提供一种耐温型爽滑PE膜,具有良好的爽滑效果,同时保持膜的摩擦系数保持稳定,避免复合熟化后制袋会出现的袋子难以打开的现象。
本发明的另一目的在于提供一种耐温型爽滑PE膜及其制备方法,以获得一种耐温型高爽滑的PE膜,简化工艺条件,适用于大规模生产。
为实现上述目的本发明所采用的技术方案如下:
一种耐温型爽滑PE膜,其是采用以重量百分比计算的以下原料制备而成:低密度聚乙烯40%~50%、高密度聚乙烯1.3%~1.6%、线性低密度聚乙烯47%-57%、开口剂1%~1.4%。
在本发明中,由于加入高密度的HDPE,可能会降低材料的伸长率,而且高密度聚乙烯爽滑性能优良,本身的爽滑程度稳定,但由于其挺度较大,不易于薄膜的加工,因此,通过添加线性低密度聚乙烯到配方中,可以增加材料的强度和易于加工,同时又可以避免因添加爽滑剂而受到温度的影响导致的爽滑性能不稳定。
本发明中,所采用的低密度聚乙烯是指密度在0.922~0.926g/cm3范围的聚乙烯。
本发明中,所采用的高密度聚乙烯是指密度在0.945~0.965g/cm3范围的聚乙烯。
本发明中,所采用的线性低密度聚乙烯是指密度在0.922~0.926g/cm3范围的线性聚乙烯。
塑料薄膜的开口困难是由于薄膜闭合后膜之间形成真空密合状态,不易分开,加上薄膜成型后其表面有大量的外露分子链,在两片薄膜闭合后产生了大分子链之间的互相缠绕,开口剂是能与薄膜结合在一起降低粘连,改善膜之间的缠绕现象。二氧化硅是一种常用的开口剂,能解决塑料薄膜粘连的问题,但是由于其折射率与塑料膜的折射率相差较大,会影响薄膜的透明度;在本发明中,发明人研究发现二氧化硅和聚乙烯的混合体作开口剂,二氧化硅分散在聚乙烯中,加入较容易而且不含任何易挥发物及析出物,保证被包装物的质量,提高薄膜的透明性、表面光洁性及加工性、热封性,又能避免开口剂在高温下失去作用,导致的薄膜包装袋难以开口。其中当二氧化硅与聚乙烯的重量比为1:8~9时,可以达到较佳的效果。
摩擦系数越小,膜与膜之间的粘连程度也越小,爽滑程度越高。在本发明中,所述耐温型爽滑PE膜的动摩擦系数μd≤0.16。
作为本发明的一种优选的方案,所述耐温型爽滑PE膜是用以重量百分比计算的以下原料制备而成:低密度聚乙烯40%~45%、高密度聚乙烯1.5%~1.6%、线性低密度聚乙烯50%-57%、开口剂1.2%~1.4%。
一种耐温型爽滑PE膜的制备方法,其包括以下步骤:
1)将各组分按配方量投入混炼机中充分混合;
2)混合后的物料投入挤压机中挤压成型;
3)冷却,得到成品。
上述方案中,挤压机挤压成型过程中的温度130-190℃。
相比现有技术,本发明的有益效果在于:
1.本发明所述的耐温型爽滑PE膜的动摩擦系数μd≤0.16,即使是复合后进行高温熟化仍能保持稳定的爽滑性能,因此具有良好的耐高温和爽滑性能;
2.本发明所述的耐温型爽滑PE膜在复合、熟化等高温条件下,薄膜内层的爽滑度不易受到温度的影响而变差,爽滑度相对会保持稳定,具有更为广泛的应用领域;
3.本发明的制备方法操作简单,适用于大规模生产。
下面结合具体的实施方式对本发明作进一步详细说明。
具体实施方式
以下是本发明具体的实施例。
实施例1
一种耐温型爽滑PE膜,其是采用以重量百分比计算的以下原料:低密度聚乙烯40%、高密度聚乙烯1.6%、线性低密度聚乙烯57%、开口剂1.4%,其中低密度聚乙烯的密度为0.922~0.926g/cm3,高密度聚乙烯的密度为0.945~0.965g/cm3,线性低密度聚乙烯指密度为0.922~0.926g/cm3;通过以下步骤制备而成:
1)将各组分按配方量投入混炼机中充分混合;
2)混合后的物料投入挤压机中在130℃的温度下挤压成型;
3)冷却,得到成品。
实施例2
一种耐温型爽滑PE膜,其是采用以重量百分比计算的以下原料:低密度聚乙烯50%、高密度聚乙烯1.6%、线性低密度聚乙烯47%、开口剂1.4%,其中低密度聚乙烯的密度为0.922~0.926g/cm3,高密度聚乙烯的密度为0.945~0.965g/cm3,线性低密度聚乙烯指密度为0.922~0.926g/cm3;通过以下步骤制备而成:
1)将各组分按配方量投入混炼机中充分混合;
2)混合后的物料投入挤压机中在150℃的温度下挤压成型;
3)冷却,得到成品。
实施例3
一种耐温型爽滑PE膜,其是采用以重量百分比计算的以下原料:低密度聚乙烯45%、高密度聚乙烯1.3%、线性低密度聚乙烯52.7%、开口剂1%,其中低密度聚乙烯的密度为0.922~0.926g/cm3,高密度聚乙烯的密度为0.945~0.965g/cm3,线性低密度聚乙烯指密度为0.922~0.926g/cm3;通过以下步骤制备而成:
1)将各组分按配方量投入混炼机中充分混合;
2)混合后的物料投入挤压机中在190℃的温度下挤压成型;
3)冷却,得到成品。
对比例
上述实施例1-3的产品和普通的PE包装膜分别在熟化前和在60℃的温度下,熟化48小时后,采用国家标准GB10006-88的检测方法检测其动摩擦系数,检测结果见表1。
表1
上述实施方式仅为本发明的优选实施方式,不能以此来限定本发明保护的范围,本领域的技术人员在本发明的基础上所做的任何非实质性的变化及替换均属于本发明所要求保护的范围。
Claims (8)
1.一种耐温型爽滑PE膜,其特征在于,其是用以重量百分比计算的以下原料制备而成:低密度聚乙烯40%~50%、高密度聚乙烯1.3%~1.6%、线性低密度聚乙烯 47-57% 、开口剂1%~1.4%。
2.根据权利要求1所述的耐温型爽滑PE膜,其特征在于,所述低密度聚乙烯是指密度在0.922~0.926 g/cm3范围的聚乙烯。
3.根据权利要求1所述的耐温型爽滑PE膜,其特征在于,所述高密度聚乙烯是指密度在0.945~0.965g/cm3范围的聚乙烯。
4.根据权利要求1所述的耐温型爽滑PE膜,其特征在于,所述线性低密度聚乙烯是指密度在0.922~0.926 g/cm3范围的线性聚乙烯。
5.根据权利要求1所述的耐温型爽滑PE膜,其特征在于,所述开口剂为二氧化硅与聚乙烯的混合物,其中二氧化硅与聚乙烯的重量比为1:8~9。
6.根据权利要求1-5所述的耐温型爽滑PE膜,其特征在于,所述耐温型爽滑PE膜的动摩擦系数μd≤0.16。
7.根据权利要求1-5任一项所述的耐温型爽滑PE膜,其特征在于,其是用以重量百分比计算的以下原料制备而成:低密度聚乙烯40%~45%、高密度聚乙烯1.5%~1.6%、线性低密度聚乙烯 50-57% 、开口剂1.2%~1.4%。
8.一种如权利要求1-5任一项所述的耐温型爽滑PE膜的制备方法,其特征在于,其包括以下步骤:
1)将各组分按配方量投入混炼机中充分混合;
2)混合后的物料投入挤压机中挤压成型;
3)冷却,得到成品。
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Cited By (7)
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CN104311949A (zh) * | 2014-10-11 | 2015-01-28 | 中国石油化工股份有限公司 | 一种用于制备热收缩薄膜的高强度聚乙烯材料及其制备方法 |
CN105017630A (zh) * | 2015-06-29 | 2015-11-04 | 广东炜鸿塑料科技有限公司 | 一种耐低温塑料薄膜及其制备方法 |
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CN105670073A (zh) * | 2015-12-21 | 2016-06-15 | 深圳市康尼塑胶有限公司 | 一种气泡膜配方 |
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CN107792502A (zh) * | 2016-08-29 | 2018-03-13 | 宜兴威尼特集装袋有限公司 | 耐高温阀口纸包装袋 |
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CN104311949A (zh) * | 2014-10-11 | 2015-01-28 | 中国石油化工股份有限公司 | 一种用于制备热收缩薄膜的高强度聚乙烯材料及其制备方法 |
CN104311949B (zh) * | 2014-10-11 | 2017-11-10 | 中国石油化工股份有限公司 | 一种用于制备热收缩薄膜的高强度聚乙烯材料及其制备方法 |
CN105017630A (zh) * | 2015-06-29 | 2015-11-04 | 广东炜鸿塑料科技有限公司 | 一种耐低温塑料薄膜及其制备方法 |
CN105017630B (zh) * | 2015-06-29 | 2017-06-30 | 广东炜鸿塑料科技有限公司 | 一种耐低温塑料薄膜及其制备方法 |
CN105419048A (zh) * | 2015-12-04 | 2016-03-23 | 苏州康尼包装材料有限公司 | 一种加强型气垫膜 |
CN105504432A (zh) * | 2015-12-04 | 2016-04-20 | 苏州康尼包装材料有限公司 | 一种气垫膜 |
CN105670073A (zh) * | 2015-12-21 | 2016-06-15 | 深圳市康尼塑胶有限公司 | 一种气泡膜配方 |
CN107792502A (zh) * | 2016-08-29 | 2018-03-13 | 宜兴威尼特集装袋有限公司 | 耐高温阀口纸包装袋 |
CN107498965A (zh) * | 2017-07-07 | 2017-12-22 | 河间市精诚塑业有限公司 | 一种超薄低压热塑膜及其制备工艺 |
CN107498965B (zh) * | 2017-07-07 | 2019-03-12 | 河间市精诚塑业有限公司 | 一种超薄低压热塑膜及其制备工艺 |
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