CN110423404B - 一种贴膜盒及其制备工艺 - Google Patents
一种贴膜盒及其制备工艺 Download PDFInfo
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Abstract
本发明公开了一种贴膜盒及其制备工艺,涉及包装盒技术领域,解决了因吸塑盒的耐低温性能较差而容易产生开裂,进而导致其整体应用效果不佳的问题。一种贴膜盒,其包括如下重量份数的组分:聚丙烯90‑95份;色母料3‑5份;增韧剂2‑4份;聚苯醚3‑7份;聚对苯二甲酸乙二醇酯4‑6份;高阻隔膜5‑8份,且贴膜盒的制备工艺包括混料挤出、压合成材和吸塑成型。本发明中的贴膜盒具有良好的耐低温性,在较低温度下不易出现脆化,整体具有良好的抗冲击性和韧性大大降低,且在实际使用过程中具有良好的应用效果。
Description
技术领域
本发明涉及包装盒技术领域,更具体地说,它涉及一种贴膜盒及其制备工艺。
背景技术
吸塑盒是采用吸塑工艺生产出的塑料制品,大量用于生活,生产中,具有重量轻、运输方便、密封性能好的优点。
在公告号为CN109517276A的中国发明专利申请文件中公开了一种可蒸汽消毒耐高温吸塑盒及生产方法,其包括盒体和盒盖;所述盒体和盒盖包括以下重量份的原料:聚丙烯85~95份、聚丙烯酰胺14~18份、马来酸酐接枝聚丙烯5~8份、乙烯-丙烯的共聚物16~19份、纳米二氧化硅12~17份、抗氧剂2.5~3.5份、聚乙烯蜡2~4.5份。
上述专利申请文件中,耐高温,可蒸汽消毒,不容易变形;强度高,使用寿命长;收缩率低,不容易出现卷边变形;卫生,无毒,能够满足食品包装要求,但其整体的耐低温性能较差,且在较低温度下容易出现脆化,整体抗冲击性和韧性大大降低,使吸塑盒容易产生开裂,进而导致其整体应用效果较差的问题,因此,需要提出一种新的方案来解决上述问题。
发明内容
针对现有技术中因吸塑盒的耐低温性能较差而容易产生开裂,进而导致其整体应用效果不佳的问题,本发明的目的一在于提供一种贴膜盒,通过加入聚苯醚和聚对苯二甲酸乙二醇酯,并使其相互之间起到良好的复配增效作用,以解决上述技术问题,其具有良好的耐低温性,在实际使用过程中具有良好的应用效果。
为实现上述目的一,本发明提供了如下技术方案:
一种贴膜盒,包括如下重量份数的组分:
聚丙烯90-95份;
色母料3-5份;
增韧剂2-4份;
聚苯醚3-7份;
聚对苯二甲酸乙二醇酯4-6份;
高阻隔膜5-8份。
通过采用上述技术方案,聚丙烯是由丙烯聚合而制得的一种热塑性树脂,其化学稳定性很好,具有良好的防腐蚀性能,且聚丙烯无毒无味,耐热性能好,为贴膜盒的主要原料。选用不同的色母料,可以制得不同颜色的贴膜盒,具有良好的使用效果。增韧剂能够提高贴膜和整体的结构强度,并使其具有良好的抗冲击性和韧性,在使用过程中不易产生开裂。高阻隔膜是把气体阻隔性很强的材料与热缝合性、水分阻隔性很强的聚烯烃同时进行挤出而成,是多层结构的薄膜,其作为贴膜盒表面的基材,不仅使贴膜盒整体具有良好的结构强度,还能减小低温对聚丙烯的侵蚀,使贴膜盒在低温下仍具有良好的抗冲击性和韧性,且不易产生开裂。
聚苯醚无毒,相对密度小,具有优良的机械强度、耐应力松弛、抗蠕变性和尺寸稳定性,其对聚丙烯具有良好的改性作用,能够改进其耐应力开裂性和冲击性能。聚对苯二甲酸乙二醇酯在较宽的温度范围内具有优良的物理机械性能,且抗蠕变性,耐疲劳性,耐摩擦性和尺寸稳定性良好,其可以对聚丙烯进行改性,进而提高贴膜盒整体的耐低温性和抗抗开裂性能。同时,聚苯醚和聚对苯二甲酸乙二醇酯在混合使用时能够起到良好的复配增效作用,使贴膜盒在低温环境中的脆性断裂转变为延性断裂,大幅度提高贴膜盒整体的抗冲性和韧性,且不易产生开裂,整体具有良好的应用效果。
进一步优选为,所述贴膜盒的组分中还加入有重量份数为4-6份的功能助剂,功能助剂包括三元乙丙橡胶和聚烯烃POE,且三元乙丙橡胶和聚烯烃POE的重量份数比为(2-5):1。
通过采用上述技术方案,三元乙丙橡胶具有优越的耐氧化、抗臭氧和抗侵蚀的能力,其对聚丙烯起到良好的混合改性作用,能够使贴膜盒具有良好的抗低温侵蚀能力。聚烯烃POE的耐热性和耐寒性优异,使用温度范围宽广,可以使聚丙烯在较低温度下仍具有良好的抗冲击性和韧性。而加入由三元乙丙橡胶和聚烯烃POE组成的功能助剂,既能提高贴膜盒整体的抗冲击性和韧性,还能使贴膜盒在较低温度下仍能保持良好的稳定性,且整体具有良好的应用效果。
进一步优选为,所述增韧剂选用聚丁二烯橡胶、丁苯橡胶、乙丙橡胶、丁腈橡胶和氯化聚乙烯中的任意一种。
通过采用上述技术方案,聚丁二烯橡胶、丁苯橡胶、乙丙橡胶、丁腈橡胶和氯化聚乙烯均为良好的增韧剂,使低温环境中的贴膜盒在产生裂纹时,使裂纹不易迅速扩展,进而避免开裂情况的产生。同时,增韧剂还能提高提高贴膜盒对冲击能量的分散能力和吸收能力,并提高贴膜盒整体的承载能力,进而使制得的贴膜盒具有较高的品质。
进一步优选为,所述高阻隔膜的结构为PP/TIE粘结层树脂/EVOH/TIE粘结层树脂/PE,且高阻隔膜的厚度为30-50μm。
通过采用上述技术方案,选用结构PP/TIE粘结层树脂/EVOH/TIE粘结层树脂/PE的高阻隔膜,使其与挤出的聚丙烯及其他各组分原料之间具有良好的贴合性,且高阻隔膜的厚度为30-50μm,使其整体具有良好的吸塑成型效果。同时,上述高阻隔膜使贴膜盒整体具有良好的结构强度,并能减小低温对聚丙烯的侵蚀,使贴膜盒在低温下仍具有良好的抗冲击性和韧性,且不易产生开裂。
本发明的目的二在于提供一种贴膜盒的制备工艺,采用该工艺制备的贴膜盒具有良好的耐低温性,在实际使用过程中具有良好的应用效果。
为实现上述目的二,本发明提供了如下技术方案,包括以下步骤:
步骤一,混料挤出,将相应重量份数的聚丙烯、色母料、增韧剂、聚苯醚和聚对苯二甲酸乙二醇酯混合均匀,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、200-210℃、212-218℃、220-230℃、235℃,得到膜材;
步骤二,压合成材,将挤出成型后的膜材和高阻隔膜经压辊进行压合,得到片材;
步骤三,吸塑成型,将片材经过热熔软化后,置于模具的正上方,通过吸塑成型设备,经压边、真空吸塑、裁剪后,得到贴膜盒。
通过采用上述技术方案,将聚丙烯和其他各组分原料混合均匀后,经双螺杆挤出机挤出成型,得到膜材,紧接着在膜材的表面贴附高阻隔膜,经过压辊压合之后得到片材,然后在热熔软化后,通过吸塑成型设备,经压边、真空吸塑、裁剪后,得到贴膜盒。如此设置,整个制备工艺操作简单,生产高效,且得到的贴膜盒具有较高的品质,整体应用效果好。
进一步优选为,所述步骤三中,模具在使用前进行预热处理,并使模具的温度维持在40-50℃。
通过采用上述技术方案,对模具进行预热处理,有利于使热熔软化后的片材在与模具接触时能够完全贴合,且在真空吸塑时,能够使片层的成型更加均匀平整,进而使得到的贴膜盒具有良好的品质。
进一步优选为,所述步骤三中,软化后的片材在模具中被真空吸塑时所承受的压力为6-8MPa。
通过采用上述技术方案,采用上述参数控制,能够使热熔软化后的片材均匀稳定的发生形变,并能够完全的贴合在模具上,同时还能使贴膜盒保持良好的厚度要求,且使模具上贴附的片材不易产生变形,进而能够保证贴膜盒整体的品质。
进一步优选为,所述步骤三中,软化后的片材在经过真空吸塑后,在成型片材的周侧用冷风进行降温处理。
通过采用上述技术方案,用冷风对模具上贴附的片材进行降温,有利于加快片材冷却成型的速率,进而能够提高整个制备工艺的生产效率。同时,冷风对片材的表面进行处理,能够使贴膜盒整体在成型过程中的结构组织更加紧致,整体品质大大提高。
进一步优选为,所述步骤二中,膜材和高阻隔膜经压辊进行压合时,两压辊间的距离为0.65-1.3mm。
进一步优选为,所述步骤二中,压辊在使用时的温度为25-30℃。
通过采用上述技术方案,才用上述参数控制,能够严格控制片材的厚度,并使膜材和高阻隔膜之间具有较高的结合强度,且压辊在使用时的温度为25-30℃,有利于使膜材和高阻隔膜在压合过程中不易产生较大的形变,进而能够得到稳定良好的片材,并使片材在后期吹塑过程中具有良好的应用性。
综上所述,与现有技术相比,本发明具有以下有益效果:
(1)加入聚苯醚和聚对苯二甲酸乙二醇酯,并使其在混合使用时能够起到良好的复配增效作用,使贴膜盒在低温环境中的脆性断裂转变为延性断裂,大幅度提高贴膜盒整体的抗冲性和韧性,且不易产生开裂,整体具有良好的应用效果;
(2)加入由三元乙丙橡胶和聚烯烃POE组成的功能助剂,既能提高贴膜盒整体的抗冲击性和韧性,还能使贴膜盒在较低温度下仍能保持良好的稳定性,且整体具有良好的应用效果; (3)将聚丙烯和其他各组分原料混合均匀后,经双螺杆挤出机挤出成型,得到膜材,紧接着在膜材的表面贴附高阻隔膜,不仅使贴膜盒整体具有良好的结构强度,还能减小低温对聚丙烯的侵蚀,使贴膜盒在低温下仍具有良好的抗冲击性和韧性,且不易产生开裂。
附图说明
图1为本发明中贴膜盒的制备工艺流程图。
具体实施方式
下面结合附图和实施例,对本发明进行详细描述。
实施例1:一种贴膜盒,各组分及其相应的重量份数如表1所示,并通过如下步骤制备获得:
步骤一,混料挤出,将相应重量份数的聚丙烯、色母料、聚丁二烯橡胶、聚苯醚和聚对苯二甲酸乙二醇酯混合均匀,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、215℃、225℃、235℃,得到膜材;
步骤二,压合成材,将挤出成型后的膜材和高阻隔膜经压辊进行压合,两压辊间的距离为 0.95mm,且压辊在使用时的温度为27.5℃,得到片材;
步骤三,吸塑成型,将片材经过热熔软化后,置于模具的正上方,通过吸塑成型设备,经压边、真空吸塑、裁剪后,得到贴膜盒,且真空吸塑时片材所承受的压力为7MPa。
注:步骤一中的色母料可以根据客户的需要选用不同颜色的色母料,而色母料通常包括酞菁红、酞菁蓝、酞菁绿、耐晒大红、大分子红、大分子黄、永固黄、永固紫、偶氮红、镉红、镉黄、钛白粉、炭黑、氧化铁红、氧化铁黄等,本实施例中的色母料选用钛白粉;步骤二中的高阻隔膜的结构为PP/TIE粘结层树脂/EVOH/TIE粘结层树脂/PE,且高阻隔膜的厚度为40μm。
实施例2-8:一种贴膜盒,与实施例1的不同之处在于,各组分及其相应的重量份数如表1所示。
表1实施例1-8中各组分及其重量份数
实施例9:一种贴膜盒,与实施例1的不同之处在于,步骤一具体设置为,混料挤出,将相应重量份数的聚丙烯、色母料、丁苯橡胶、聚苯醚和聚对苯二甲酸乙二醇酯混合均匀,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、215℃、225℃、235℃,得到膜材。
实施例10:一种贴膜盒,与实施例1的不同之处在于,步骤一具体设置为,混料挤出,将相应重量份数的聚丙烯、色母料、丁腈橡胶、聚苯醚和聚对苯二甲酸乙二醇酯混合均匀,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、215℃、225℃、235℃,得到膜材。
实施例11:一种贴膜盒,与实施例1的不同之处在于,步骤二中的高阻隔膜的结构为PP/TIE粘结层树脂/EVOH/TIE粘结层树脂/PE,且高阻隔膜的厚度为30μm。
实施例12:一种贴膜盒,与实施例1的不同之处在于,步骤二中的高阻隔膜的结构为PP/TIE粘结层树脂/EVOH/TIE粘结层树脂/PE,且高阻隔膜的厚度为50μm。
实施例13:一种贴膜盒,与实施例1的不同之处在于,步骤三中真空吸塑时片材所承受的压力为6MPa。
实施例14:一种贴膜盒,与实施例1的不同之处在于,步骤三中真空吸塑时片材所承受的压力为8MPa。
实施例15:一种贴膜盒,与实施例1的不同之处在于,步骤二中两压辊间的距离为0.65mm。
实施例16:一种贴膜盒,与实施例1的不同之处在于,步骤二中两压辊间的距离为1.3mm。
实施例17:一种贴膜盒,与实施例1的不同之处在于,步骤二中压辊在使用时的温度为25℃。
实施例18:一种贴膜盒,与实施例1的不同之处在于,步骤二中压辊在使用时的温度为30℃。
实施例19:一种贴膜盒,与实施例1的不同之处在于,步骤一具体设置为,混料挤出,将相应重量份数为90份的聚丙烯、3份的色母料、2份的聚丁二烯橡胶、3份的聚苯醚、4份的聚对苯二甲酸乙二醇酯和5份的功能助剂混合均匀,功能助剂由重量份数比为 3.5:1的元乙丙橡胶和聚烯烃POE组成,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、215℃、225℃、235℃,得到膜材。
实施例20:一种贴膜盒,与实施例1的不同之处在于,步骤一具体设置为,混料挤出,将相应重量份数为90份的聚丙烯、3份的色母料、2份的聚丁二烯橡胶、3份的聚苯醚、4份的聚对苯二甲酸乙二醇酯和5份的功能助剂混合均匀,功能助剂由重量份数比为2:1的元乙丙橡胶和聚烯烃POE组成,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、215℃、225℃、235℃,得到膜材。
实施例21:一种贴膜盒,与实施例1的不同之处在于,步骤一具体设置为,混料挤出,将相应重量份数为90份的聚丙烯、3份的色母料、2份的聚丁二烯橡胶、3份的聚苯醚、4份的聚对苯二甲酸乙二醇酯和5份的功能助剂混合均匀,功能助剂由重量份数比为 5:1的元乙丙橡胶和聚烯烃POE组成,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、215℃、225℃、235℃,得到膜材。
实施例22:一种贴膜盒,与实施例1的不同之处在于,步骤三中,模具在使用前进行预热处理,并使模具的温度维持在45℃。
实施例23:一种贴膜盒,与实施例1的不同之处在于,步骤三中,模具在使用前进行预热处理,并使模具的温度维持在40℃。
实施例24:一种贴膜盒,与实施例1的不同之处在于,步骤三中,模具在使用前进行预热处理,并使模具的温度维持在50℃。
实施例25:一种贴膜盒,与实施例1的不同之处在于,骤三中,软化后的片材在经过真空吸塑后,在成型片材的周侧用冷风进行降温处理。
对比例1:一种贴膜盒,与实施例1的不同之处在于,步骤一具体设置为,混料挤出,将相应重量份数的聚丙烯、色母料、聚丁二烯橡胶和聚对苯二甲酸乙二醇酯混合均匀,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、215℃、225℃、235℃,得到膜材。
对比例2:一种贴膜盒,与实施例1的不同之处在于,步骤一具体设置为,混料挤出,将相应重量份数的聚丙烯、色母料、聚丁二烯橡胶和聚苯醚混合均匀,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、215℃、225℃、235℃,得到膜材。
对比例3:一种贴膜盒,与实施例1的不同之处在于,步骤一具体设置为,混料挤出,将相应重量份数的聚丙烯、色母料和聚丁二烯橡胶混合均匀,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、205℃、 215℃、225℃、235℃,得到膜材。
性能测试
试验样品:采用实施例1-25中获得的贴膜盒作为试验样品1-25,采用对比例1-3中获得的贴膜盒作为对照样品1-3。
试验方法:分别取试验样品1-25和对照样品1-3中的贴膜盒各5个,然后分别将每种样品的5个贴膜盒在﹣40℃、﹣30℃、﹣20℃、﹣10℃和0℃的环境中放置一个小时,取出后在室温下放置五个小时,然后测量每个贴膜盒的抗冲击强度,并对应试验样品1-25和对照样品1-3进行记录。冲击韧性是描述高分子材料在高速碰击下所呈现的坚韧程度,或抗断裂能力。一般来说,冲击韧性包括两个方面:受冲击后的变形能力以及扛断裂能力,前者一般用断裂伸长率表示,而后者一般用冲击强度来表示。摆锤打击简支梁试样的中部,使试样受到冲击而断裂,试样断裂时单位面积或单位宽度所消耗的冲击功即为冲击强度。本实验中采用抗冲击测试仪对每个贴膜盒的抗冲击强度进行检测。
试验结果:试验样品1-25和对照样品1-3的测试结果如表2所示。由表2可知,由试验样品1-8和对照样品1-3测试结果对照可得,加入聚苯醚和聚对苯二甲酸乙二醇酯,均能提高贴膜盒整体的抗冲击强度,且其混合使用时,对贴膜盒整体的抗冲击强度提升最佳。由试验样品1-8和试验样品9-18测试结果对照可得,本发明所公开的增韧剂,以及制备工艺中的参数控制均适用于贴膜盒的制备。由试验样品1-8和试验样品19-21测试结果对照可得,加入由三元乙丙橡胶和聚烯烃POE组成的功能助剂,既能提高贴膜盒整体的抗冲击性和韧性,还能使贴膜盒在较低温度下仍能保持良好的稳定性。由试验样品1-8和试验样品 22-24测试结果对照可得,对模具进行预热处理,也能够提高贴膜盒的抗冲击强度。由试验样品1-8和试验样品25的测试结果对照可得,在成型片材的周侧用冷风进行降温处理,能够使贴膜盒在低温下的抗冲击强度提高。
表2试验样品1-25和对照样品1-3的测试结果
以上所述仅是本发明的优选实施方式,本发明的保护范围并不仅局限于上述实施例,凡属于本发明思路下的技术方案均属于本发明的保护范围。应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理前提下的若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (8)
1.一种贴膜盒,其特征在于,包括如下重量份数的组分:
聚丙烯 90-95份;
色母料 3-5份;
增韧剂 2-4份;
聚苯醚 3-7份;
聚对苯二甲酸乙二醇酯 4-6份;
高阻隔膜 5-8份;
所述贴膜盒的组分中还加入有重量份数为4-6份的功能助剂,功能助剂包括三元乙丙橡胶和聚烯烃POE,且三元乙丙橡胶和聚烯烃POE的重量份数比为(2-5):1;
所述高阻隔膜的结构为PP/TIE粘结层树脂/EVOH/TIE粘结层树脂/PE,且高阻隔膜的厚度为30-50μm。
2.根据权利要求1所述的贴膜盒,其特征在于,所述增韧剂选用聚丁二烯橡胶、丁苯橡胶、乙丙橡胶、丁腈橡胶和氯化聚乙烯中的任意一种。
3.一种如权利要求1所述的贴膜盒的制备工艺,其特征在于,包括以下步骤:
步骤一,混料挤出,将相应重量份数的聚丙烯、色母料、增韧剂、聚苯醚和聚对苯二甲酸乙二醇酯混合均匀,然后投入双螺杆挤出机中,挤出成型,且双螺杆挤出机温度由进料口到出料口温度依次控制为195℃、200-210℃、212-218℃、220-230℃、235℃,得到膜材;
步骤二,压合成材,将挤出成型后的膜材和高阻隔膜经压辊进行压合,得到片材;
步骤三,吸塑成型,将片材经过热熔软化后,置于模具的正上方,通过吸塑成型设备,经压边、真空吸塑、裁剪后,得到贴膜盒。
4.根据权利要求3所述的贴膜盒的制备工艺,其特征在于,所述步骤三中,模具在使用前进行预热处理,并使模具的温度维持在40-50℃。
5.根据权利要求3所述的贴膜盒的制备工艺,其特征在于,所述步骤三中,软化后的片材在模具中被真空吸塑时所承受的压力为6-8MPa。
6.根据权利要求3所述的贴膜盒的制备工艺,其特征在于,所述步骤三中,软化后的片材在经过真空吸塑后,在成型片材的周侧用冷风进行降温处理。
7.根据权利要求3所述的贴膜盒的制备工艺,其特征在于,所述步骤二中,膜材和高阻隔膜经压辊进行压合时,两压辊间的距离为0.65-1.3mm。
8.根据权利要求3所述的贴膜盒的制备工艺,其特征在于,所述步骤二中,压辊在使用时的温度为25-30℃。
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