CN113755090B - 一种可塑形包装膜的制备方法 - Google Patents
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Abstract
本发明提供了一种可塑形包装膜的制备方法,属于包装膜技术领域。包括以下步骤:S1、多层共挤膜的制备,将各组分投入到多层共挤挤出机中挤出,S2、辐照交联,将上述步骤中得到的多层共挤膜牵引至电子辐照设备中进行辐照交联;S3、涂布,在制备的多层共挤膜上表面涂布可塑形光热双重固化涂布液,形成可塑形光热双重固化涂层;所述可塑形光热双重固化涂层内含有闭孔缓冲微气囊,所述闭孔缓冲微气囊的尺寸为100‑350um。本发明提供的可塑形包装膜的制备方法,在常规多层共挤软包装膜表面涂覆光热双重固化涂层,热固化后包装膜仍具有优异的热成型性能,按被包裹物外形塑型,经UV光照后定形并增加强度,兼顾可柔性包裹又可坚固支撑保护。
Description
技术领域:
本发明涉及包装膜技术领域,具体涉及一种可塑形包装膜的制备方法。
背景技术:
为使产品在生产流通过程中方便运输、搬运和存储,通常会在产品外部使用包装袋。尤其对于一些形状特殊又需要抗压、防撞的产品,若使用普通抗压缓冲包装盒,不能做到柔性包裹,其内可能会有较大的空余空间,造成空间浪费;使用普通包装膜可以柔性包裹,但普通包装膜不够坚固,不能对产品支撑保护,且缓冲性能差。
此外,为了增加包装膜的缓冲性能,一般可在包装膜原料中添加发泡剂,但常规发泡剂用于薄膜材料中时易大量形成开孔气泡,造成材料力学性能大幅下降,若使用热膨胀微球作为闭孔发泡材料,热膨胀微球通常耐溶剂性能较差,在涂料中使用时,常会被溶剂渗透溶胀造成发泡效率下降,且热膨胀微球密度低,与常规树脂相容性一般,在涂料中使用时易漂浮在表面,造成涂层表面力学性能下降。
发明内容:
本发明的目的是针对现有技术的缺陷,提供一种可塑形包装膜的制备方法。
实现本发明目的的技术方案是:一种可塑形包装膜的制备方法,包括以下步骤:
S1、制备多层共挤膜,将多层共挤膜的各组分投入到多层共挤挤出机中挤出,所述多层共挤膜的总厚度为50-150μm;
S2、辐照交联,将步骤S1中得到的多层共挤膜放入电子辐照设备中进行辐照交联;
S3、涂布,在制备的多层共挤膜外表面涂布可塑形光热双重固化涂布液,形成可塑形光热双重固化涂层;所述可塑形光热双重固化涂层厚度为50-100μm,其内含有闭孔缓冲微气囊,所述闭孔缓冲微气囊的尺寸为100-350um。
所述多层共挤膜的层数可根据生产需要决定,比如可以为5-13层结构。
优选的,所述电子辐照设备电压为0.5-1.0MeV,吸收剂量为50-200KGy,运行速度为20-60m/min。
优选的,以重量份数计,所述可塑形光热双重固化涂布液包括多官能度光固化树脂100份,热固化树脂50-200份,光引发剂5-10份,固化剂2-20份,流平剂1-5份,纳米粒子5-30份,热膨胀微球5-20份,反应型稀释剂100-200份。
优选的,所述多官能度光固化树脂为聚氨酯丙烯酸酯、聚酯丙烯酸酯、有机硅丙烯酸酯、聚醚丙烯酸酯中的一种或两种以上组合,官能度≥6。
优选的,所述热固化树脂玻璃化转变温度0-30℃,所述热固化树脂为多羟基聚醚、多羟基聚酯、多羟基丙烯酸酯、多羧基丙烯酸酯中的一种或两种以上组合。
优选的,所述纳米粒子为纳米氧化铝、纳米二氧化硅中的一种或两种混合,粒径20-100nm。
优选的,所述热发泡剂为热膨胀微球,其初始粒径10-30μm,热发泡温度80-160℃,体积热膨胀倍数40-120倍。
优选的,所述反应型稀释剂的官能度不低于2,沸点≥160℃。
优选的,所述光引发剂为苯偶酰类、二苯甲酮类、烷基苯酮类中的一种或两种以上组合。
优选的,所述固化剂为异氰酸酯类、氨基树脂类中的一种或两种组合。
本发明可塑形包装膜的制备方法的有益效果是:
(1)本发明提供了一种可塑形包装膜的制备方法,在常规多层共挤软包装膜表面涂覆光热双重固化涂层,热固化后包装膜仍然较软易按被包裹物外形塑性,经UV光照后定形并增加强度,兼顾柔性包裹和支撑保护。
(2)使用热膨胀微球作为闭孔发泡材料,可保持较高力学强度的情况下实现闭孔发泡,增加缓冲。选用热膨胀微球代替常规发泡剂代替,避免出现气泡破裂而导致薄膜出现力学缺陷。若不添加热膨胀微球,也可以达到可塑形的效果,但缓冲保护的效果会大大下降。
(3)光热双重固化涂液为无溶剂配方,并通过树脂、纳米粒子、流平剂的比例搭配解决了热膨胀微球易漂浮在表面的问题。
具体实施方式:
下面对本发明的较佳实施例进行详细阐述,以使本发明的优点和特征能更易被本领域人员理解,从而对本发明的保护范围做出更为清楚明确的界定。
原料说明:
多官光固化树脂型号可包括聚氨酯丙烯酸酯蓝柯路L-6905E、美源MU9800、DSMAgiSyn 2421等,有机硅丙烯酸酯广州博兴B-818、B-812等,聚醚丙烯酸酯Laromer PO94F。
热固化树脂型号常州都铂多羟基丙烯酸酯J502、多羧基丙烯酸酯J602。
光引发剂为苯偶酰类、二苯甲酮类、烷基苯酮类中的1种或多种,如苯偶酰类651,二苯甲酮类winure BP,烷基苯酮184、2959等。
固化剂为异氰酸酯类、氨基树脂类中的1种或多种,如异氰酸酯科思创L75、科思创N3390、氨基树脂氰特325等。
流平剂为有机硅类、丙烯酸酯类中的1种或多种,如摩能化工1153、1154、1073、1074等。
纳米粒子型号为北京德科岛金纳米氧化铝DK410-2、DK410-1,纳米二氧化硅DK-SiO2-T30。
热膨胀微球型号为阿克苏诺贝尔043DU80、053DU40、007WUF40、642WU40、930DU120等。若不添加热膨胀微球,也可以达到可塑形的效果,但缓冲保护的效果会大大下降。
反应型稀释剂型号为长兴化学EM221、EM226、EM2280等。
实施例1
一种可塑形包装膜的制备方法,包括以下步骤:
S1、制备多层共挤膜,将多层共挤膜的各组分投入到多层共挤挤出机中挤出,所述多层共挤膜的总厚度为50μm;制备的多层共挤膜为5层,具体为PE/TIE/EVOH/TIE/PE。
S2、辐照交联,将步骤S1中得到的多层共挤膜放入电子辐照设备中进行辐照交联,辐照电压为0.5MeV,吸收剂量为60KGy,运行速度为50m/min。
S3、涂布,在制备的多层共挤膜外表面涂布可塑形光热双重固化涂布液,形成可塑形光热双重固化涂层;所述可塑形光热双重固化涂层厚度为50μm,其内含有闭孔缓冲微气囊,所述闭孔缓冲微气囊的尺寸为150μm。
其中,以重量份数计,所述可塑形光热双重固化涂布液包括多官能度光固化树脂100份,热固化树脂100份,光引发剂8份,固化剂10份,流平剂3份,纳米粒子15份,热膨胀微球12份,反应型稀释剂150份。
具体的,所述多官能度光固化树脂为聚氨酯丙烯酸酯蓝柯路L-6905E。
所述热固化树脂多羟基丙烯酸酯多羟基丙烯酸酯J502,玻璃化转变温度8℃。
所述纳米粒子为纳米氧化铝DK410-2。
所述热膨胀微球为043DU80,初始粒径16-24μm,热发泡温度95-115℃,体积热膨胀倍数50倍。
所述反应型稀释剂为长兴化学EM221
所述光引发剂为烷基苯酮184。
所述固化剂为异氰酸酯科思创L75。
所述流平剂为机硅类摩能化工1153。
实施例2
一种可塑形包装膜的制备方法,包括以下步骤:
S1、制备多层共挤薄膜层,将多层共挤薄膜层的各组分投入到多层共挤挤出机中挤出,得到共挤膜层,所述多层共挤薄膜层的总厚度为80μm;制备的多层共挤膜层为7,为PE/PE/TIE/EVOH/TIE/PE/PE。
S2、辐照交联,将步骤S1中得到的多层共挤薄膜层放入电子辐照设备中进行辐照交联,辐照电压为0.5MeV,吸收剂量为80KGy,运行速度为50m/min。
S3、涂布,在制备的共挤膜层外表面涂布可塑形光热双重固化涂布液,形成可塑形光热双重固化涂层;所述可塑形光热双重固化涂层厚度为85μm,其内含有闭孔缓冲微气囊,所述闭孔缓冲微气囊的尺寸为250μm。
其中,以重量份数计,所述可塑形光热双重固化涂布液包括多官能度光固化树脂100份,热固化树脂50份,光引发剂5份,固化剂2份,流平剂1份,纳米粒子5份,热膨胀微球5份,反应型稀释剂100份。
所述多官能度光固化树脂为有机硅丙烯酸酯广州博兴B-818。
所述热固化树脂为多羧基丙烯酸酯J602,玻璃化转变温度16℃。
所述纳米粒子为纳米氧化铝DK410-1。
所述热发泡剂为热膨胀微球,053DU40,其初始粒径10-16μm,热发泡温度96-103℃,体积热膨胀倍数80倍。
所述反应型稀释剂为长兴化学EM2280
所述光引发剂为苯偶酰类651。
所述固化剂为氨基树脂氰特325。
所述流平剂为丙烯酸酯类摩能化工1074。
实施例3
一种可塑形包装膜的制备方法,包括以下步骤:
S1、制备多层共挤薄膜层,将多层共挤薄膜层的各组分投入到多层共挤挤出机中挤出,得到共挤膜层,所述多层共挤薄膜层的总厚度为120μm;制备的多层共挤膜层为7层,具体为PE/TIE/PA/EVOH/PA/TIE/PE。
S2、辐照交联,将步骤S1中得到的多层共挤薄膜层放入电子辐照设备中进行辐照交联,辐照电压为0.5MeV,吸收剂量为60KGy,运行速度为40m/min。S3、涂布,在制备的共挤膜层表面涂布可塑形光热双重固化涂布液,形成可塑形光热双重固化涂层;所述可塑形光热双重固化涂层厚度为100μm,其内含有闭孔缓冲微气囊,所述闭孔缓冲微气囊的尺寸为330μm。
其中,以重量份数计,所述可塑形光热双重固化涂布液包括多官能度光固化树脂100份,热固化树脂200份,光引发剂10份,固化剂20份,流平剂5份,纳米粒子30份,热膨胀微球20份,反应型稀释剂200份。
所述多官能度光固化树脂为聚醚丙烯酸酯Laromer PO94F。
所述热固化树脂玻璃化转变温度8℃,所述热固化树脂为多羟基丙烯酸酯J502。
所述纳米粒子为纳米二氧化硅DK-SiO2-T30。
所述热发泡剂为热膨胀微球930DU120,其初始粒径20-30μm,热发泡温度123-133℃,体积热膨胀倍数120倍。
所述反应型稀释剂为长兴化学EM226。所述光引发剂为烷基苯酮类2959。
所述固化剂为异氰酸酯科思创L75。
所述流平剂为有机硅类摩能化工1154。
实施例4
与实施例1的区别是:制备的多层共挤膜层数为11,为PP/PP/PP/TIE/PA/EVOH/PA/TIE/PE/PE/PE
实施例5
与实施例1的区别是:制备的多层共挤膜层数为11层,为PA/PE/PE/TIE/PA/EVOH/PA/TIE/PE/PE/PE。
对比例1
与实施例1的区别是:使用常规发泡剂偶氮二异丁腈,代替热膨胀微球。偶氮二异丁腈12份。
对比例2
与实施例1的区别是:为仅热固化的涂料方案,不含多官能度光固化树脂、光引发剂。
对比例3
与实施例1的区别是:为空白样,即多层复合膜PE/TIE/PA/TIE/PA未涂布的样品。
上述实施例1-5及对比例1-2,涂布后经60℃×3分钟、80℃×2分钟、100℃×1分钟三段温区干燥。实施例1-3及对比例1-3取样性能测试,取卷外1米薄膜,经紫外光照射固化后测试性能,光照能量为300mJ/cm2。结果如下:
可见,实施例1、2、3、4、5与对比例3相比,拉伸强度、断裂伸长率、抗撕裂强度、冲击强度等力学性能均有显著提升。与对比例1相比,普通发泡剂会产生开孔气泡,导致出现大量应力集中点或应力缺陷,拉伸强度、断裂伸长率、抗撕裂强度、冲击强度等力学性能均有明显下降。对比例2相比,使用单纯热固化树脂,其性能与未涂布的空白样基本无差别。
以上所述实施例仅表达了本发明的几种实施方式,其描述较为具体和详细,但并不能因此而理解为对发明专利范围的限制。应当指出的是,对于本领域的普通技术人员来说,在不脱离本发明构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。
Claims (9)
1.一种可塑形包装膜的制备方法,其特征在于,包括以下步骤:
S1、制备多层共挤膜,将多层共挤膜的各组分投入到多层共挤挤出机中挤出,所述多层共挤膜的总厚度为50-150μm;
S2、辐照交联,将步骤S1中得到的多层共挤膜牵引至电子辐照设备中进行辐照交联;
S3、涂布,在制备的多层共挤膜外表面涂布可塑形光热双重固化涂布液,形成可塑形光热双重固化涂层;所述可塑形光热双重固化涂层厚度为50-100μm,其内含有闭孔缓冲微气囊,所述闭孔缓冲微气囊的尺寸为100-350um;
涂布后经60℃×3分钟、80℃×2分钟、100℃×1分钟三段温区干燥,之后经紫外光照射固化;
以重量份数计,所述可塑形光热双重固化涂布液包括多官能度光固化树脂100份,热固化树脂50-200份,光引发剂5-10份,固化剂2-20份,流平剂1-5份,纳米粒子5-30份,热膨胀微球5-20份,反应型稀释剂100-200份。
2.根据权利要求1所述的可塑形包装膜的制备方法,其特征在于,所述电子辐照设备电压为0.5-1.0MeV,吸收剂量为50-200KGy,运行速度为20-60m/min。
3.根据权利要求1所述的可塑形包装膜的制备方法,其特征在于,所述多官能度光固化树脂为聚氨酯丙烯酸酯、聚酯丙烯酸酯、有机硅丙烯酸酯、聚醚丙烯酸酯中的一种或两种以上组合,官能度≥6。
4.根据权利要求1所述的可塑形包装膜的制备方法,其特征在于,所述热固化树脂玻璃化转变温度0-30℃,所述热固化树脂为多羟基聚醚、多羟基聚酯、多羟基丙烯酸酯、多羧基丙烯酸酯中的一种或两种以上组合。
5.根据权利要求1所述的可塑形包装膜的制备方法,其特征在于,所述纳米粒子为纳米氧化铝、纳米二氧化硅中的一种或两种混合,粒径20-100nm。
6.根据权利要求1所述的可塑形包装膜的制备方法,其特征在于,所述热膨胀微球的初始粒径10-30μm,热发泡温度80-160℃,体积热膨胀倍数40-120倍。
7.根据权利要求1所述的可塑形包装膜的制备方法,其特征在于,所述反应型稀释剂的官能度不低于2,沸点≥160℃。
8.根据权利要求1所述的可塑形包装膜的制备方法,其特征在于,所述光引发剂为苯偶酰类、二苯甲酮类、烷基苯酮类中的一种或两种以上组合。
9.根据权利要求1所述的可塑形包装膜的制备方法,其特征在于,所述固化剂为异氰酸酯类、氨基树脂类中的一种或两种组合。
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