CN111070611B - 一种抗老化聚烯烃热收缩薄膜的制备方法 - Google Patents
一种抗老化聚烯烃热收缩薄膜的制备方法 Download PDFInfo
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Abstract
本发明公开了一种抗老化聚烯烃热收缩薄膜的制备方法,其中一种抗老化聚烯烃热收缩薄膜的制备方法,其包括,制备第一供给熔融料流,其为将线性低密度聚乙烯LLDPE、爽滑剂和抗UV添加剂熔融;制备第二供给熔融料流,其为将三元共聚聚丙烯TPP、开口剂、抗UV添加剂熔融;将所述第一供给熔融料流和所述第二供给熔融料流经共挤模头挤出;水冷定型、牵引后二次牵引、加热、吹胀后风冷定型、息泡展平,收卷结束;其中,所述第一供给熔融料流与所述第二供给熔融料流的料流量供应比例为(1~5):(1~5)。该热收缩薄膜包装的产品,可以解决当其需要放在室外进行储存时减缓老化的现象,避免封口强度下降及在搬运过程中会出现封口开裂的现象。
Description
技术领域
本发明属于化工技术领域,具体涉及一种抗老化聚烯烃热收缩薄膜的制备方法。
背景技术
聚烯烃热收缩膜是用包装机对薄膜热切封口和加热收缩实现热缩包装的。有些由聚烯烃热收缩薄膜包装的产品需要放在室外进行储存,在光照和氧的作用下聚烯烃热收缩薄膜分子链会部分(断裂)降解,薄膜老化,从而导致封口强度下降。当被包装物为较重产品时,在搬运过程中会出现封口开裂的现象,基于此研发抗老化聚烯烃热收缩薄膜。
发明内容
本部分的目的在于概述本发明的实施例的一些方面以及简要介绍一些较佳实施例。在本部分以及本申请的说明书摘要和发明名称中可能会做些简化或省略以避免使本部分、说明书摘要和发明名称的目的模糊,而这种简化或省略不能用于限制本发明的范围。
鉴于上述的技术缺陷,提出了本发明。
因此,作为本发明其中一个方面,本发明克服现有技术中存在的不足,提供一种抗老化聚烯烃热收缩薄膜的制备方法。
为解决上述技术问题,本发明提供了如下技术方案:一种抗老化聚烯烃热收缩薄膜的制备方法,其包括,制备第一供给熔融料流,其为将线性低密度聚乙烯LLDPE、爽滑剂和抗UV添加剂熔融;制备第二供给熔融料流,其为将三元共聚聚丙烯TPP、开口剂、抗UV添加剂熔融;将所述第一供给熔融料流和所述第二供给熔融料流经共挤模头挤出;水冷定型、牵引后二次牵引、加热、吹胀后风冷定型、息泡展平,收卷结束;其中,所述第一供给熔融料流与所述第二供给熔融料流的料流量供应比例为(1~5):(1~5)。
作为本发明所述的抗老化聚烯烃热收缩薄膜的制备方法的优选方案,其中:所述第一供给熔融料流与所述第二供给熔融料流的熔融参数为螺杆转速为100~140r/min,160~240℃熔融充分,所述挤出,其为在温度180~220℃、转速为120~165r/min下,混合3~5min。
作为本发明所述的抗老化聚烯烃热收缩薄膜的制备方法的优选方案,其中:所述加热,其为通过红外线加热至塑料管坯到高弹态90~130℃。
作为本发明所述的抗老化聚烯烃热收缩薄膜的制备方法的优选方案,其中:所述爽滑剂为LDPE、芥酸酰胺和油酸酰胺的混合物。
作为本发明所述的抗老化聚烯烃热收缩薄膜的制备方法的优选方案,其中:所述开口剂为低密度聚乙烯LDPE(C2H4)n和二氧化硅SiO2混合物。
作为本发明所述的抗老化聚烯烃热收缩薄膜的制备方法的优选方案,其中:所述抗UV添加剂包括苯甲酸类﹑二笨甲酮类﹑苯并三唑类、受阻胺类中的一种或几种。
作为本发明所述的抗老化聚烯烃热收缩薄膜的制备方法的优选方案,其中:所述第一供给熔融料流与所述第二供给熔融料流的数量比例为2:1,所述第一供给熔融料流的数量为偶数。
作为本发明其中一个方面,本发明提供一种抗老化聚烯烃热收缩薄膜,其包括第一供给熔融料流层和第二供给熔融料流层,所述第一供给熔融料流层包括线性低密度聚乙烯、双滑剂、抗老化剂中的一种或几种,所述第二供给熔融料流层的成分包括三元共聚聚丙烯、开口剂、抗老化剂中的一种或几种。
作为本发明所述的抗老化聚烯烃热收缩薄膜的优选方案,其中:拉伸强度可达110N/mm2,断裂伸长率可达100%
本发明的有益效果:。
本发明制备了新型聚烯烃热收缩薄膜包装的产品,可以解决当其需要放在室外进行储存时减缓老化的现象,避免封口强度下降及在搬运过程中会出现封口开裂的现象。
具体实施方式
为使本发明的上述目的、特征和优点能够更加明显易懂,下面结合具体实施例对本发明的具体实施方式做详细的说明。
在下面的描述中阐述了很多具体细节以便于充分理解本发明,但是本发明还可以采用其他不同于在此描述的其它方式来实施,本领域技术人员可以在不违背本发明内涵的情况下做类似推广,因此本发明不受下面公开的具体实施例的限制。
其次,此处所称的“一个实施例”或“实施例”是指可包含于本发明至少一个实现方式中的特定特征、结构或特性。在本说明书中不同地方出现的“在一个实施例中”并非均指同一个实施例,也不是单独的或选择性的与其他实施例互相排斥的实施例。
实施例1:
(1)将质量分数为95%线性低密度聚乙烯LLDPE(购买于美国陶氏公司,型号为DOWLEX2045,密度为0.918~0.935g/cm)、3%爽滑剂(LDPE、芥酸酰胺和油酸酰胺的混合物,其中,酰胺类的有效含量为7%,油酸酰胺和芥酸酰胺的质量分数比为1.5:1)和2%抗UV添加剂(KZPP04,购买于Schulman公司)通过真空吸料的方式加入至一台单螺杆挤出机中熔融,单螺杆挤出机的螺杆转速为115r/min,200℃熔融充分。
(2)将96%三元共聚聚丙烯TPP(新加坡TPC的FS6612L产成品)、2%开口剂(为低密度聚乙烯LDPE(C2H4)n和二氧化硅SiO2混合物,二氧化硅有效含量为20%)和2%抗UV添加剂(KZPP04,购买于Schulman公司)通过真空吸料的方式加入至另一台单螺杆中熔融,单螺杆挤出机的螺杆转速为125r/min,180℃熔融充分;
步骤(1)同时使用两台单螺杆挤出机进行,利用步骤(1)中两台单螺杆(第一台和第二台)和步骤(2)中一台单螺杆供给熔融料流,控制三台单螺杆中料流供应比例,第一台:第二台:第三台=1:5:1,再在三层共挤模头内(温度为210℃,螺杆转速为145r/min)汇合,快速充分混合(3~5min)后,启动三层共挤吹膜机一次性三层共挤成型,共挤出得到多层复合片材,使用水冷机进行水冷定型(冷水温度15℃),使用牵引机将膜导入干燥机,牵引后二次牵引、红外线二次加热(辐射波长为20~30微米,加热塑料管坯到高弹态110~118℃)、吹胀(横向吹胀比5倍、纵向拉伸比5倍)风冷定型(风冷温度25℃)、息泡展平,由牵引机导入收卷机结束。预热机,预热后(150℃),双向拉伸,得抗老化聚烯烃热收缩薄膜。
实施例2:
(1)将质量分数为95%线性低密度聚乙烯LLDPE(购买于美国陶氏公司,型号为DOWLEX2045,密度为0.918~0.935g/cm)、3%爽滑剂(LDPE、芥酸酰胺和油酸酰胺的混合物,其中,酰胺类的有效含量为7%,油酸酰胺和芥酸酰胺的质量分数比为1:1)和2%抗UV添加剂(KZPP04,购买于Schulman公司)通过真空吸料的方式加入至一台单螺杆中熔融,单螺杆挤出机的螺杆转速为115r/min,190℃熔融充分。
(2)将96%三元共聚聚丙烯TPP(新加坡TPC的FS6612L产成品)、2%开口剂(为低密度聚乙烯LDPE(C2H4)n和二氧化硅SiO2混合物,二氧化硅有效含量为20%)和2%抗UV添加剂(KZPP04,购买于Schulman公司)通过真空吸料的方式加入至另一台单螺杆中熔融,单螺杆挤出机的螺杆转速为120r/min,200℃熔融充分;
利用步骤(1)中两台单螺杆(第一台和第二台)和步骤(2)中一台单螺杆供给熔融料流,控制三台单螺杆中料流供应比例,第一台:第二台:第三台=1:5:1,再在三层共挤模头内(温度为220℃,螺杆转速为150r/min)汇合,充分混合后,启动三层共挤吹膜机一次性三层共挤成型,共挤出得到多层复合片材,使用水冷机进行水冷定型(冷水温度15℃),使用牵引机将膜导入干燥机,牵引后二次牵引、红外线二次加热(辐射波长为10~20微米,加热塑料管坯到高弹态110~118℃)、吹胀(横向吹胀比5倍、纵向拉伸比5倍)风冷定型(风冷温度25℃)、息泡展平,由牵引机导入收卷机结束。预热机,预热后(130℃),双向拉伸,得抗老化聚烯烃热收缩薄膜。
实施例3:
(1)将质量分数为95%线性低密度聚乙烯LLDPE(购买于美国陶氏公司,型号为DOWLEX2045,密度为0.918~0.935g/cm)、3%爽滑剂(LDPE、芥酸酰胺和油酸酰胺的混合物,其中,酰胺类的有效含量为7%,油酸酰胺和芥酸酰胺的质量分数比为1.2:1)和2%抗UV添加剂(KZPP04,购买于Schulman公司)通过真空吸料的方式加入至一台单螺杆挤出机中熔融,单螺杆挤出机的螺杆转速为115r/min,200℃熔融充分。
(2)将96%三元共聚聚丙烯TPP(新加坡TPC的FS6612L产成品)、2%开口剂(为低密度聚乙烯LDPE(C2H4)n和二氧化硅SiO2混合物,二氧化硅有效含量为20%)和2%抗UV添加剂(KZPP04,购买于Schulman公司)通过真空吸料的方式加入至另一台单螺杆中熔融,单螺杆挤出机的螺杆转速为120r/min,200℃熔融充分;
步骤(1)同时使用两台单螺杆挤出机进行,利用步骤(1)中两台单螺杆(第一台和第二台)和步骤(2)中一台单螺杆供给熔融料流,控制三台单螺杆中料流供应比例,第一台:第二台:第三台=1:5:1,再在三层共挤模头内(温度为200℃,螺杆转速为145r/min)汇合,快速充分混合(3~5min)后,启动三层共挤吹膜机一次性三层共挤成型,共挤出得到多层复合片材,使用水冷机进行水冷定型(冷水温度15℃),使用牵引机将膜导入干燥机,牵引后二次牵引、红外线二次加热(辐射波长为40~50微米,加热塑料管坯到高弹态110~118℃)、吹胀(横向吹胀比5倍、纵向拉伸比5倍)风冷定型(风冷温度25℃)、息泡展平,由牵引机导入收卷机结束。预热机,预热后(150℃),双向拉伸,得抗老化聚烯烃热收缩薄膜。
实施例4:
(1)将质量分数为95%线性低密度聚乙烯LLDPE(购买于美国陶氏公司,型号为DOWLEX2045,密度为0.918~0.935g/cm)、3%爽滑剂(LDPE、芥酸酰胺和油酸酰胺的混合物,其中,酰胺类的有效含量为7%,油酸酰胺和芥酸酰胺的质量分数比为1.2:1)和2%抗UV添加剂(PAO 3360,购买于Constab公司)通过真空吸料的方式加入至一台单螺杆中熔融,单螺杆挤出机的螺杆转速为115r/min,190℃熔融充分。
(2)将96%三元共聚聚丙烯TPP(新加坡TPC的FS6612L产成品)、2%开口剂(为低密度聚乙烯LDPE(C2H4)n和二氧化硅SiO2混合物,二氧化硅有效含量为20%)和2%抗UV添加剂(KZPP04,购买于Schulman公司)通过真空吸料的方式加入至另一台单螺杆中熔融,单螺杆挤出机的螺杆转速为120r/min,200℃熔融充分;
利用步骤(1)中两台单螺杆(第一台和第二台)和步骤(2)中一台单螺杆供给熔融料流,控制三台单螺杆中料流供应比例,第一台:第二台:第三台=1:5:1,再在三层共挤模头内(温度为220℃,螺杆转速为150r/min)汇合,充分混合后,启动三层共挤吹膜机一次性三层共挤成型,共挤出得到多层复合片材,使用水冷机进行水冷定型(冷水温度15℃),使用牵引机将膜导入干燥机,牵引后二次牵引、红外线二次加热(辐射波长为40~45微米,加热塑料管坯到高弹态110~118℃)、吹胀(横向吹胀比5倍、纵向拉伸比5倍)风冷定型(风冷温度25℃)、息泡展平,由牵引机导入收卷机结束。预热机,预热后(130℃),双向拉伸,得抗老化聚烯烃热收缩薄膜。
实施例5~8的实施方式参见实施例1,具体的不同如表1;对实施例1~8及市售抗老化聚烯烃热收缩薄膜进行性能检测,结果如表2、表3。
表1实施例5~8的热收缩膜的原料配比及工艺制备方案
表2
表3
应说明的是,以上实施例仅用以说明本发明的技术方案而非限制,尽管参照较佳实施例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的精神和范围,其均应涵盖在本发明的权利要求范围当中。
Claims (1)
1.一种抗老化聚烯烃热收缩薄膜的制备方法,其特征在于:包括,
步骤(1):将质量分数为95%线性低密度聚乙烯LLDPE、3%爽滑剂和2%抗UV添加剂通过真空吸料的方式加入至一台单螺杆挤出机中熔融,单螺杆挤出机的螺杆转速为115r/min,200℃熔融充分,同时使用第一台、第二台两台单螺杆挤出机进行;
步骤(2):将96%三元共聚聚丙烯TPP、2%开口剂和2%抗UV添加剂通过真空吸料的方式加入至第三台单螺杆中熔融,单螺杆挤出机的螺杆转速为125r/min,180℃熔融充分;
将步骤(1)中两台单螺杆和步骤(2)中的一台单螺杆供给熔融料流,控制三台单螺杆中料流供应比例,第一台:第二台:第三台=1:5:1,再在三层共挤模头内汇合,快速充分混合3~5min后,启动三层共挤吹膜机一次性三层共挤成型,共挤出得到多层复合片材;
使用水冷机进行水冷定型,使用牵引机将膜导入干燥机,牵引后二次牵引、红外线二次加热、吹胀、风冷定型、息泡展平,由牵引机导入收卷机结束;
预热机预热至150℃后,双向拉伸,得抗老化聚烯烃热收缩薄膜;
其中,步骤(1)中的低密度聚乙烯LLDPE购买于美国陶氏公司,型号为DOWLEX2045,密度为0.918~0.935g/cm;爽滑剂为LDPE、芥酸酰胺和油酸酰胺的混合物,其中,酰胺类的有效含量为7%,油酸酰胺和芥酸酰胺的质量分数比为1.5:1;抗UV添加剂为KZPP04,购买于Schulman公司;
其中,步骤(2)中的三元共聚聚丙烯TPP为新加坡TPC的FS6612L产成品;开口剂为低密度聚乙烯LDPE(C2H4)n和二氧化硅SiO2混合物,二氧化硅有效含量为20%;抗UV添加剂为KZPP04,购买于Schulman公司;
其中,在三层共挤模头内汇合,共挤模头温度为210℃,螺杆转速为145r/min;水冷定型,冷水温度为15℃;红外线二次加热,其中,辐射波长为20~30微米,加热塑料管坯到高弹态110~118℃;吹胀,横向吹胀比5倍、纵向拉伸比5倍;风冷定型,风冷温度25℃。
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