CN112120141A - 一种抗菌性聚酯薄膜及其制备方法 - Google Patents
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- 229920006267 polyester film Polymers 0.000 title claims abstract description 34
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000002344 surface layer Substances 0.000 claims abstract description 77
- 229920000139 polyethylene terephthalate Polymers 0.000 claims abstract description 71
- 239000005020 polyethylene terephthalate Substances 0.000 claims abstract description 71
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- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
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- 235000019259 sodium dehydroacetate Nutrition 0.000 claims abstract description 15
- DSOWAKKSGYUMTF-GZOLSCHFSA-M sodium;(1e)-1-(6-methyl-2,4-dioxopyran-3-ylidene)ethanolate Chemical compound [Na+].C\C([O-])=C1/C(=O)OC(C)=CC1=O DSOWAKKSGYUMTF-GZOLSCHFSA-M 0.000 claims abstract description 15
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Abstract
本发明公开了一种抗菌性聚酯薄膜,包括上表层、芯层、下表层,芯层原料为大有光PET聚酯切片;上表层的原料按重量百分比包括:PET聚酯切片20‑40%、PET聚酯抗粘母料60‑80%;下表层的原料按重量百分比包括:PET聚酯切片10‑30%、改性抗菌PET母料70‑90%;改性抗菌PET母料含有脱氢乙酸钠和金属钠离子改性剂。本发明还公开了上述抗菌性聚酯薄膜的制备方法。本发明具有良好的抗菌效果和机械性能。
Description
技术领域
本发明涉及塑料薄膜技术领域,尤其涉及一种抗菌性聚酯薄膜及其制备方法。
背景技术
近年来,食品安全问题越来越被人们重视,消费者更倾向于购买不含防腐剂的产品,为了满足消费者的需求,同时保障食品的质量、安全,新型食品包装材料的开发和应用与日俱增。
改性抗菌包装薄膜是新型包装材料的一种活性包装,是将抗菌剂等食品添加剂加入到高分子树脂中,通过一系列包装薄膜制备工艺后,获得的具有抗菌效果的包装材料,能够在食品流通和贮藏过程中保护食品不受微生物、化学等污染,延长食品货架期。但是由于抗菌剂的加入往往会影响薄膜的机械性能。
发明内容
基于背景技术存在的技术问题,本发明提出了一种抗菌性聚酯薄膜及其制备方法,本发明具有良好的抗菌效果和机械性能。
本发明提出的一种抗菌性聚酯薄膜,包括上表层、芯层、下表层,芯层原料为大有光PET聚酯切片;上表层的原料按重量百分比包括:PET聚酯切片 20-40%、PET聚酯抗粘母料60-80%;下表层的原料按重量百分比包括:PET聚酯切片10-30%、改性抗菌PET母料70-90%;改性抗菌PET母料含有脱氢乙酸钠和金属钠离子改性剂。
优选地,在金属钠离子改性剂的制备过程中,将天然沸石加入氯化钠水溶液中,于60-70℃下搅拌0.8-1.2h,离心取沉淀,水洗,干燥,研磨得到金属钠离子改性剂。
优选地,于100-110℃真空干燥11-13h。
优选地,氯化钠水溶液的浓度为0.8-1.2mol/L。
优选地,天然沸石经水洗沉降处理后,再加入氯化钠水溶液中。
优选地,研磨后过200目筛。
优选地,改性抗菌PET母料中,脱氢乙酸钠的含量为2.5-3.5wt%,金属钠离子改性剂的含量为4.5-5.5wt%。
上述大有光PET聚酯切片、PET聚酯抗粘母料均可以从市场购得。
PET是指聚对苯二甲酸乙二醇酯。
优选地,改性抗菌PET母料是脱氢乙酸钠、金属钠离子改性剂、PET树脂混匀后,经双螺杆挤出机混合、塑化、均化、熔融、挤出,切粒制得。
优选地,上表层的厚度为1.2μm、下表层的厚度为1-2μm,芯层的厚度为 6-12μm。
本发明还提出了上述抗菌性聚酯薄膜的制备方法,包括如下步骤:
S1、取大有光PET聚酯切片经结晶、干燥后,加热熔融并过滤得到芯层熔体;
S2、取上表层的原料经熔融、抽真空处理后得到上表层熔体;
S3、取下表层的原料经熔融、抽真空处理后得到下表层熔体;
S4、将芯层熔体、上表层熔体、下表层熔体在三层结构模头中汇合挤出成膜片,再冷却形成铸片,其中,汇合挤出温度为260-270℃,冷却温度为25-35℃;
S5、将铸片纵向拉伸为厚片,拉伸前的预热温度为50-90℃,拉伸温度为 90-100℃,拉伸倍率为3.0-4.5倍;
S6、将厚片横向拉伸得到抗菌性聚酯薄膜,拉伸前的预热温度为90-100℃,拉伸温度为100-110℃,定型温度为180-230℃。
优选地,芯层熔体、上表层熔体、下表层熔体的水分含量均小于50ppm。
优选地,在S1中,结晶温度为140-160℃,结晶时间为50-70min;干燥温度为140-160℃,干燥时间为230-250min。
有益效果:
本发明选用脱氢乙酸钠和金属钠离子改性剂相互配合,与PET树脂制备改性抗菌PET母料,与PET聚酯切片作为下表层的原料,使得薄膜具有良好的抗菌性,且避免将抗菌剂直接加到食品中,降低了抗菌剂的危害,同时延长食品保质期;另外本发明通过选择适宜配方和制备工艺,使得本发明在具有良好抗菌效果的同时,具有较好的机械性能,并在双向拉伸生产设备上生产聚酯薄膜,具有广泛的应用前景。
具体实施方式
下面,通过具体实施例对本发明的技术方案进行详细说明。
实施例1
一种抗菌性聚酯薄膜,包括上表层、芯层、下表层,芯层原料为大有光PET 聚酯切片;上表层的原料按重量百分比包括:PET聚酯切片20%、PET聚酯抗粘母料80%;下表层的原料按重量百分比包括:PET聚酯切片10%、改性抗菌 PET母料90%;改性抗菌PET母料含有3wt%脱氢乙酸钠和5wt%金属钠离子改性剂;
在金属钠离子改性剂的制备过程中,天然沸石经水洗沉降处理后,再加入浓度为1mol/L氯化钠水溶液中,于65℃下搅拌1h,离心取沉淀,水洗,于105℃真空干燥12h,研磨过200目筛得到金属钠离子改性剂;
改性抗菌PET母料是脱氢乙酸钠、金属钠离子改性剂、PET树脂混匀后,经双螺杆挤出机混合、塑化、均化、熔融、挤出,切粒制得;
上表层厚度为1.2μm、下表层厚度为2μm,芯层厚度6-12μm。
上述抗菌性聚酯薄膜的制备方法,包括如下步骤:
S1、取大有光PET聚酯切片于150℃结晶60min,于150℃干燥240min后,在单螺杆挤出机中加热熔融,过滤得到芯层熔体;
S2、取上表层的原料在双螺杆挤出机熔融,抽真空(除去水份和杂质)后熔融挤出得到上表层熔体;
S3、取下表层的原料在双螺杆挤出机熔融,抽真空(除去水份和杂质)后熔融挤出得到下表层熔体,芯层熔体、上表层熔体、下表层熔体的水分含量均小于50ppm;
S4、将芯层熔体、上表层熔体、下表层熔体在三层结构模头中汇合挤出成膜片,再利用静电吸附将膜片贴附到激冷辊上急冷形成铸片,其中,汇合挤出温度为260℃,冷却温度为25℃;
S5、将铸片纵向拉伸为厚片,拉伸前的预热温度为50-80℃,拉伸温度为 90-100℃,拉伸倍率为3.0倍;
S6、将厚片横向拉伸后,风冷,进入牵引系统展平、切边、测厚,然后收卷得母卷即得抗菌性聚酯薄膜,拉伸前的预热温度为90-100℃,拉伸温度为 100-110℃,定型温度为180-200℃。
实施例2
一种抗菌性聚酯薄膜,包括上表层、芯层、下表层,芯层原料为大有光PET 聚酯切片;上表层的原料按重量百分比包括:PET聚酯切片40%、PET聚酯抗粘母料60%;下表层的原料按重量百分比包括:PET聚酯切片20%、改性抗菌 PET母料80%;改性抗菌PET母料含有3.5wt%脱氢乙酸钠和4.5wt%金属钠离子改性剂;
在金属钠离子改性剂的制备过程中,天然沸石经水洗沉降处理后,再加入浓度为0.8mol/L氯化钠水溶液中,于70℃下搅拌0.8h,离心取沉淀,水洗,于 110℃真空干燥11h,研磨过200目筛得到金属钠离子改性剂;
改性抗菌PET母料是脱氢乙酸钠、金属钠离子改性剂、PET树脂混匀后,经双螺杆挤出机混合、塑化、均化、熔融、挤出,切粒制得;
上表层厚度为1.2μm、下表层厚度为1.5μm,芯层厚度6-12μm。
上述抗菌性聚酯薄膜的制备方法,包括如下步骤:
S1、取大有光PET聚酯切片于150℃结晶60min,于150℃干燥240min后,在单螺杆挤出机中加热熔融,过滤得到芯层熔体;
S2、取上表层的原料在双螺杆挤出机熔融,抽真空(除去水份和杂质)后熔融挤出得到上表层熔体;
S3、取下表层的原料在双螺杆挤出机熔融,抽真空(除去水份和杂质)后熔融挤出得到下表层熔体,芯层熔体、上表层熔体、下表层熔体的水分含量均小于50ppm;
S4、将芯层熔体、上表层熔体、下表层熔体在三层结构模头中汇合挤出成膜片,再利用静电吸附将膜片贴附到激冷辊上急冷形成铸片,其中,汇合挤出温度为265℃,冷却温度为30℃;
S5、将铸片纵向拉伸为厚片,拉伸前的预热温度为50-80℃,拉伸温度为 90-100℃,拉伸倍率为4.0倍;
S6、将厚片横向拉伸后,风冷,进入牵引系统展平、切边、测厚,然后收卷得母卷即得抗菌性聚酯薄膜,拉伸前的预热温度为90-100℃,拉伸温度为 100-110℃,定型温度为190-220℃。
实施例3
一种抗菌性聚酯薄膜,包括上表层、芯层、下表层,芯层原料为大有光PET 聚酯切片;上表层的原料按重量百分比包括:PET聚酯切片30%、PET聚酯抗粘母料70%;下表层的原料按重量百分比包括:PET聚酯切片30%、改性抗菌PET母料70%;改性抗菌PET母料含有2.5wt%脱氢乙酸钠和5.5wt%金属钠离子改性剂;
在金属钠离子改性剂的制备过程中,天然沸石经水洗沉降处理后,再加入浓度为1.2mol/L氯化钠水溶液中,于60℃下搅拌1.2h,离心取沉淀,水洗,于 100℃真空干燥13h,研磨过200目筛得到金属钠离子改性剂;
改性抗菌PET母料是脱氢乙酸钠、金属钠离子改性剂、PET树脂混匀后,经双螺杆挤出机混合、塑化、均化、熔融、挤出,切粒制得;
上表层厚度为1.2μm、下表层厚度为1.0μm,芯层厚度6-12μm。
上述抗菌性聚酯薄膜的制备方法,包括如下步骤:
S1、取大有光PET聚酯切片于150℃结晶60min,于150℃干燥240min后,在单螺杆挤出机中加热熔融,过滤得到芯层熔体;
S2、取上表层的原料在双螺杆挤出机熔融,抽真空(除去水份和杂质)后熔融挤出得到上表层熔体;
S3、取下表层的原料在双螺杆挤出机熔融,抽真空(除去水份和杂质)后熔融挤出得到下表层熔体,芯层熔体、上表层熔体、下表层熔体的水分含量均小于50ppm;
S4、将芯层熔体、上表层熔体、下表层熔体在三层结构模头中汇合挤出成膜片,再利用静电吸附将膜片贴附到激冷辊上急冷形成铸片,其中,汇合挤出温度为270℃,冷却温度为35℃;
S5、将铸片纵向拉伸为厚片,拉伸前的预热温度为50-80℃,拉伸温度为 90-100℃,拉伸倍率为4.5倍;
S6、将厚片横向拉伸后,风冷,进入牵引系统展平、切边、测厚,然后收卷得母卷即得抗菌性聚酯薄膜,拉伸前的预热温度为90-100℃,拉伸温度为 100-110℃,定型温度为200-230℃。
对比例
聚酯薄膜的下表层与上表层原料配比相同,原料按重量百分比包括:PET 聚酯切片30%、PET聚酯抗粘母料70%,其他同实施例1。
取实施例1-3和对比例,检测其物性指标和抗菌效果(以大肠杆菌和金黄色葡萄球菌随时间推移的菌体生长情况为例),结果如表1、2所示。
表1物性指标检测结果
表2抗菌效果
注:“---”表示无菌生长;“+”表示菌体生长较强,“++”表示菌体生长强,“+++”表示菌体生长很强。
由表1和表2可以看出:脱氢乙酸钠及金属钠离子改性剂的加入,使聚酯薄膜具有很好的抑菌效果的同时,并具有良好的机械性能,能满足食品等包装生产的要求。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (10)
1.一种抗菌性聚酯薄膜,包括上表层、芯层、下表层,其特征在于,芯层原料为大有光PET聚酯切片;上表层的原料按重量百分比包括:PET聚酯切片20-40%、PET聚酯抗粘母料60-80%;下表层的原料按重量百分比包括:PET聚酯切片10-30%、改性抗菌PET母料70-90%;改性抗菌PET母料含有脱氢乙酸钠和金属钠离子改性剂。
2.根据权利要求1所述抗菌性聚酯薄膜,其特征在于,在金属钠离子改性剂的制备过程中,将天然沸石加入氯化钠水溶液中,于60-70℃下搅拌0.8-1.2h,离心取沉淀,水洗,干燥,研磨得到金属钠离子改性剂。
3.根据权利要求2所述抗菌性聚酯薄膜,其特征在于,于100-110℃真空干燥11-13h;优选地,氯化钠水溶液的浓度为0.8-1.2mol/L。
4.根据权利要求2所述抗菌性聚酯薄膜,其特征在于,天然沸石经水洗沉降处理后,再加入氯化钠水溶液中;优选地,研磨后过200目筛。
5.根据权利要求1-4任一项所述抗菌性聚酯薄膜,其特征在于,改性抗菌PET母料中,脱氢乙酸钠的含量为2.5-3.5wt%,金属钠离子改性剂的含量为4.5-5.5wt%。
6.根据权利要求1-5任一项所述抗菌性聚酯薄膜,其特征在于,改性抗菌PET母料是脱氢乙酸钠、金属钠离子改性剂、PET树脂混匀后,经双螺杆挤出机混合、塑化、均化、熔融、挤出,切粒制得。
7.根据权利要求1-6任一项所述抗菌性聚酯薄膜,其特征在于,上表层的厚度为1.2μm、下表层的厚度为1-2μm,芯层的厚度为6-12μm。
8.一种如权利要求1-7任一项所述抗菌性聚酯薄膜的制备方法,其特征在于,包括如下步骤:
S1、取大有光PET聚酯切片经结晶、干燥后,加热熔融并过滤得到芯层熔体;
S2、取上表层的原料经熔融、抽真空处理后得到上表层熔体;
S3、取下表层的原料经熔融、抽真空处理后得到下表层熔体;
S4、将芯层熔体、上表层熔体、下表层熔体在三层结构模头中汇合挤出成膜片,再冷却形成铸片,其中,汇合挤出温度为260-270℃,冷却温度为25-35℃;
S5、将铸片纵向拉伸为厚片,拉伸前的预热温度为50-90℃,拉伸温度为90-100℃,拉伸倍率为3.0-4.5倍;
S6、将厚片横向拉伸得到抗菌性聚酯薄膜,拉伸前的预热温度为90-100℃,拉伸温度为100-110℃,定型温度为180-230℃。
9.根据权利要求8所述抗菌性聚酯薄膜的制备方法,其特征在于,芯层熔体、上表层熔体、下表层熔体的水分含量均小于50ppm。
10.根据权利要求8或9所述抗菌性聚酯薄膜的制备方法,其特征在于,在S1中,结晶温度为140-160℃,结晶时间为50-70min;干燥温度为140-160℃,干燥时间为230-250min。
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