CN111925549A - 一种低温热封复合膜及其生产方法 - Google Patents
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Abstract
本发明公开了一种低温热封复合膜及其生产方法,低温热封复合膜,包括结构层和复合在结构层其中一侧表面上的热封层,所述的结构层为聚酯薄膜,所述的热封层涂布、固化于聚酯薄膜上,本发明克服了现有技术的不足,生产的低温热封复合膜低温,抗拉伸性能好、密封效果,且热封后的破袋率为0。
Description
技术领域
本发明涉及热封复合膜技术领域,具体属于一种低温热封复合膜及其生产方法。
背景技术
随着包装行业对包装速度和包装效率要求的不断提高,包装厂在不断的引进自动包装机,以节省人力,降低生产成本。目前的自动包装机主要应用于自动成型、灌装、热封等一系列过程,但是对于不同产品的包装,导致自动包装机对热封膜提出了特定的要求,正常情况下,自动包装机的包装温度在150℃以上,热封过程中,因为产品的偏移,会导致产品出现烫伤,同时过高的温度也会导致热封膜在包装后产生破裂,因此,需要一种低温热封的热封膜。
发明内容
本发明的目的是提供一种低温热封复合膜及其生产方法,克服了现有技术热封膜普遍的热封温度高的问题。
为解决上述问题,本发明所采取的技术方案如下:
一种低温热封复合膜,包括结构层和复合在结构层其中一侧表面上的热封层,所述的结构层为聚酯薄膜,所述的热封层涂布、固化于聚酯薄膜上。
进一步,所述的热封层由以下重量份的原料制成:3份乙烯-醋酸乙烯共聚物、3.5份超低密度聚乙烯和2份乙烯基聚合物接枝聚醚多元醇、30-35份低密度聚乙烯、50-60份线性低密度聚乙烯、1-1.2份甲基丙烯酸、0.6-1.0份过氧化二异丙苯和1-3份改性剂。
进一步,所述的改性剂为质量比为1-1.5:0.8-1.0的己二酸二辛酯和环氧脂肪酸丁酯的混合物。
生产低温热封复合膜的方法,包括以下步骤:
S1,将热封层的原料乙烯-醋酸乙烯共聚物、超低密度聚乙烯和乙烯基聚合物接枝聚醚多元醇、低密度聚乙烯、线性低密度聚乙烯按照重量比加入搅拌机中进行搅拌混合,搅拌温度为125℃,搅拌20min,然后加入甲基丙烯酸、过氧化二异丙苯和改性剂,继续搅拌30min,得到热封胶料;
S2,将结构层使用电晕机进行电晕处理,使电晕值达到30,得到电晕结构层;
S3,将电晕结构层加热至50℃,然后向电晕结构层上表面上喷涂改性液,得到喷涂结构层;
S4,将喷涂结构层升温至60℃,并使用刮刀将热封胶料涂布于喷涂有过氧化二异丙苯一侧的表面上,然后采用风冷降温,降温至40℃,然后使用双轮辊加热至80℃,加压0.4kg,进行二次复合,然后风冷降温至20℃,收卷,得到低温热封复合膜。
进一步,所述的热封胶料在喷涂结构层上涂布的厚度为200-300um。
进一步,所述的改性液为含10wt%的过氧化二异丙苯的异丙苯溶液,所述的改性液的喷涂厚度为10-15um。
本发明与现有技术相比较,本发明的实施效果如下:本发明使用聚酯薄膜作为结构层,使本发明的热封复合膜的抗拉伸强度大,同时本发明的热封层原料中使用己二酸二辛酯和环氧脂肪酸丁酯的混合物作为改性剂,使该热封层在温度为120℃左右即可实现较好的密封效果,且热封后的破袋率为0。
己二酸二辛酯作为常用的塑化剂,其主要作用使增强塑料的可塑性,但是无法改变塑料的低温性能,同时环氧脂肪酸丁酯主要作为塑料中的硫化剂和交联剂使用,以调高塑料的结构强度,增强力学性能,而本发明通过将两者混合使用,使环氧脂肪酸丁酯分解氧化己二酸二辛酯,在该热封层体系中实现了降低热封温度,提高热封效果的作用。
另外,在生产该低温热封复合膜的过程中,对结构层进行电晕处理,使结构层的表面附着力更强,同时电晕使结构层聚酯薄膜内残留的羧基活化,在喷涂改性液后,过氧化二异丙苯可与聚酯薄膜表面的羧基交联,同时在涂布热封胶料后,结构层表面的过氧化二异丙苯与乙烯-醋酸乙烯共聚物、乙烯基聚合物接枝聚醚多元醇、甲基丙烯酸可进行交联反应,使热封胶料在固化后能牢固的附着在结构层上。
本发明生产的低温热封复合膜低温,抗拉伸性能好、密封效果,且热封后的破袋率为0。
具体实施方式
下面将对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例,都属于本发明保护的范围。
本发明使用的原料中聚酯薄膜来源于南京东宸电子材料有限公司,超低密度聚乙烯、低密度聚乙烯、线性低密度聚乙烯来源于东莞市赢信塑胶原料有限公司,乙烯基聚合物接枝聚醚多元醇来源于东莞市煜城塑化有限公司,乙烯-醋酸乙烯共聚物来源于上海帆岗塑胶原料有限公司。
实施例1
生产低温热封复合膜的方法,包括以下步骤:
(1)将热封层的原料3kg乙烯-醋酸乙烯共聚物、3.5kg超低密度聚乙烯和2kg乙烯基聚合物接枝聚醚多元醇、30kg低密度聚乙烯、60kg线性低密度聚乙烯加入搅拌机中进行搅拌混合,搅拌温度为125℃,搅拌20min,然后加入1.2kg甲基丙烯酸、0.6kg过氧化二异丙苯和2kg改性剂,其中改性剂为1.5kg的己二酸二辛酯和0.8kg的环氧脂肪酸丁酯的混合物,继续搅拌30min,得到热封胶料;
(2)将聚酯薄膜使用电晕机进行电晕处理,使电晕值达到30,得到电晕结构层;
(3)将电晕结构层加热至50℃,然后向电晕结构层上表面上喷涂改性液,改性液为含10wt%的过氧化二异丙苯的异丙苯溶液,改性液的喷涂厚度为10um,得到喷涂结构层;
(4)将喷涂结构层升温至60℃,并使用刮刀将热封胶料涂布于喷涂有过氧化二异丙苯一侧的表面上,涂布的厚度为200um,然后采用风冷降温,降温至40℃,然后使用双轮辊加热至80℃,加压0.4kg,进行二次复合,进一步增强结构层与热封层的结合强度,然后风冷降温至20℃,收卷,得到低温热封复合膜。
实施例2
生产低温热封复合膜的方法,包括以下步骤:
(1)将热封层的原料3kg乙烯-醋酸乙烯共聚物、3.5kg超低密度聚乙烯和2kg乙烯基聚合物接枝聚醚多元醇、35kg低密度聚乙烯、50kg线性低密度聚乙烯加入搅拌机中进行搅拌混合,搅拌温度为125℃,搅拌20min,然后加入1kg甲基丙烯酸、0.8kg过氧化二异丙苯和3kg改性剂,其中改性剂为1.0kg的己二酸二辛酯和1.0kg的环氧脂肪酸丁酯的混合物,继续搅拌30min,得到热封胶料;
(2)将聚酯薄膜使用电晕机进行电晕处理,使电晕值达到30,得到电晕结构层;
(3)将电晕结构层加热至50℃,然后向电晕结构层上表面上喷涂改性液,改性液为含10wt%的过氧化二异丙苯的异丙苯溶液,改性液的喷涂厚度为15um,得到喷涂结构层;
(4)将喷涂结构层升温至60℃,并使用刮刀将热封胶料涂布于喷涂有过氧化二异丙苯一侧的表面上,涂布的厚度为300um,然后采用风冷降温,降温至40℃,然后使用双轮辊加热至80℃,加压0.4kg,进行二次复合,进一步增强结构层与热封层的结合强度,然后风冷降温至20℃,收卷,得到低温热封复合膜。
对照例1
与实施例2的不同在于,改性剂的加入量为0。
对照例2
与实施例2的不同在于,结构层的表面不喷涂改性液。
对照例3
与实施例2的不同在于,聚酯薄膜不进行电晕处理。
将实施例1-2和对照例1-3中的低温热封复合膜按照GB/T13022-1991《塑料薄膜拉伸性能测试方法》进行检测拉伸强度,采用对折的形式热封,即热封层之间进行热封,按照QB/T2358-1998《塑料薄膜包装袋热合强度试验方法》进行检测,结果如下表所示:
由以上数据可知该低温热封复合膜生产过程中加入的改性剂显著降低了热封温度,同时热封强度高和抗拉伸性能好,破袋率为0。
尽管已经示出和描述了本发明的实施例,对于本领域的普通技术人员而言,可以理解在不脱离本发明的原理和精神的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由所附权利要求及其等同物限定。
Claims (6)
1.一种低温热封复合膜,其特征在于,包括结构层和复合在结构层其中一侧表面上的热封层,所述的结构层为聚酯薄膜,所述的热封层涂布、固化于聚酯薄膜上。
2.根据权利要求1所述的一种低温热封复合膜,其特征在于,所述的热封层由以下重量份的原料制成:3份乙烯-醋酸乙烯共聚物、3.5份超低密度聚乙烯和2份乙烯基聚合物接枝聚醚多元醇、30-35份低密度聚乙烯、50-60份线性低密度聚乙烯、1-1.2份甲基丙烯酸、0.6-1.0份过氧化二异丙苯和1-3份改性剂。
3.根据权利要求1所述的一种低温热封复合膜,其特征在于,所述的改性剂为质量比为1-1.5:0.8-1.0的己二酸二辛酯和环氧脂肪酸丁酯的混合物。
4.生产权利要求1-3任意一项所述的一种低温热封复合膜的方法,其特征在于,包括以下步骤:
S1,将热封层的原料乙烯-醋酸乙烯共聚物、超低密度聚乙烯和乙烯基聚合物接枝聚醚多元醇、低密度聚乙烯、线性低密度聚乙烯按照重量比加入搅拌机中进行搅拌混合,搅拌温度为125℃,搅拌20min,然后加入甲基丙烯酸、过氧化二异丙苯和改性剂,继续搅拌30min,得到热封胶料;
S2,将结构层使用电晕机进行电晕处理,使电晕值达到30,得到电晕结构层;
S3,将电晕结构层加热至50℃,然后向电晕结构层上表面上喷涂改性液,得到喷涂结构层;
S4,将喷涂结构层升温至60℃,并使用刮刀将热封胶料涂布于喷涂有过氧化二异丙苯一侧的表面上,然后采用风冷降温,降温至40℃,然后使用双轮辊加热至80℃,加压0.4kg,进行二次复合,然后风冷降温至20℃,收卷,得到低温热封复合膜。
5.根据权利要求4所述的生产低温热封复合膜的方法,其特征在于,所述的热封胶料在喷涂结构层上涂布的厚度为200-300um。
6.根据权利要求4所述的生产低温热封复合膜的方法,其特征在于,所述的改性液为含10wt%的过氧化二异丙苯的异丙苯溶液,所述的改性液的喷涂厚度为10-15um。
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