CN113248880A - 一种延长水果货架期的可生物降解气调膜及其制备方法 - Google Patents
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Abstract
本发明公开了一种延长水果货架期的可生物降解气调膜及其制备方法,以重量份计,包括有聚己二酸对苯二甲酸丁二醇酯50‑99份、聚乳酸0‑50份、光催化型抗菌剂1‑10份、三价铁离子和/或氧化石墨烯和/或贵金属离子0.001‑0.1份、相容剂1‑5份和开口剂0.1‑0.5份。本发明的气调膜具有气调功能好,对水果保鲜效果佳,且绿色环保的特点。
Description
技术领域
本发明涉及一种可生物降解气调膜及其制备方法,特别是一种延长水果货架期的可生物降解气调膜及其制备方法。
背景技术
水果是人类日常食用的食物种类之一,部分水果甚至可以作为人类的主食,中美及非洲的部分地区以香蕉为主食的历史已经可追溯至几百年前。随着经济的发展,以水果为主食的地区逐渐减少,水果逐渐变为了辅食,但是人们对于水果的质量要求却越来越高。
水果在采摘后仍会进行呼吸作用,而呼吸作用伴随着水果自身营养物质的消耗,以及褐变、腐败等生理现象,严重威胁水果品质。并且,水果的呼吸强度越高,其褐变、腐败的速度越快,货架期也越短。拥有高呼吸强度的水果,例如:香蕉、芒果、百香果、樱桃等,是极需要各种保鲜手段来维持其水果品质的。并且,氧气浓度过低,水果会发生无氧呼吸,产生酒精,加速水果腐烂,因此,制造无氧环境以抑制有氧呼吸,并不能延长水果货架期。
由于高呼吸强度水果生理过程活跃,保鲜难度相对较大,目前,针对高呼吸强度水果保鲜的专利研究不多,CN201910070458.7公开了一种用于高呼吸强度水果的复合可食型保鲜水凝胶及其制备,用于延长水果的储存期。但是,水凝胶需对水果进行涂覆成膜,不利于操作使用。
鉴于此,气调保鲜技术中的自发气调保鲜膜可以通过自发调节膜两侧的气体组成,以达到保鲜效果,延长货架期,且使用方便,是理想的保鲜手段。但是,现有的通用型自发气调膜大多数是以PP、PE、PVC等难降解材料为基材,存在材料安全性较差,气体阻隔性能过好,废弃后会造成白色污染等问题。
因此,如何提高保鲜膜的气调保鲜性能,使其满足高呼吸强度水果的保鲜需求,同时,改变保鲜膜的材质,解决材料安全和白色污染的问题,是现目前水果保鲜领域重点突破的方向。
发明内容
本发明的目的在于,提供一种延长水果货架期的可生物降解气调膜及其制备方法。本发明的气调膜具有气体阻隔性能适中,气调性能好,对水果保鲜效果佳,且材料使用安全,绿色环保的特点。
本发明的技术方案:一种延长水果货架期的可生物降解气调膜,以重量份计,包括有聚己二酸对苯二甲酸丁二醇酯50-99份、可生物降解聚酯5-50份、光催化型抗菌剂1-10份、三价铁离子和/或氧化石墨烯和/或贵金属离子0.001-0.1份、相容剂1-5份和开口剂0.1-0.5份。
前述的延长水果货架期的可生物降解气调膜,所述可生物降解聚酯为聚乳酸、聚碳酸亚丙酯、聚丁二酸丁二醇酯或聚丁二酸-己二酸-丁二醇酯中的一种或任意两种。
前述的延长水果货架期的可生物降解气调膜,所述光催化型抗菌剂为纳米二氧化钛或纳米氧化锌。
前述的延长水果货架期的可生物降解气调膜,所述三价铁离子为三氯化铁、硝酸铁或氧化铁。
前述的延长水果货架期的可生物降解气调膜,所述贵金属离子为纳米金离子或纳米银离子。
前述的延长水果货架期的可生物降解气调膜,所述相容剂为马来酸酐接枝、丙烯酸接枝、环氧树脂接枝或噁唑啉接枝中的一种。
前述的延长水果货架期的可生物降解气调膜,所述开口剂为硅藻土、滑石粉、二氧化硅、芥酸酰胺或油酸酰胺中的一种或任意两种。
一种制备前述的延长水果货架期的可生物降解气调膜的方法,步骤如下:
(1)将聚己二酸对苯二甲酸丁二醇酯、聚乳酸、光催化型抗菌剂、三价铁离子或氧化石墨烯或贵金属离子、相容剂和开口剂烘干;
(2)将步骤(1)中烘干的物料按比例混合均匀,由喂料口加入双螺杆挤出机中,产物经水冷后切粒,然后经吹膜机吹塑成膜,冷却后收卷,即得到所述气调膜。
前述的延长水果货架期的可生物降解气调膜的制备方法,步骤(1)所述烘干是在50-70℃下过夜烘干;步骤(2)所述双螺杆挤出机的进料口温度为90-110℃,二区到五区温度为150-170℃;所述吹膜机进料口温度为140-150℃,余段温度为150-160℃。
本发明的有益效果
1、本发明是以聚己二酸对苯二甲酸丁二醇酯和可生物降解聚酯作为原料制备保鲜膜,具有生物可降解的特性,材料使用安全,且绿色环保。
2、本发明利用聚己二酸对苯二甲酸丁二醇酯和可生物降解聚酯组合,通过聚己二酸对苯二甲酸丁二醇酯本身优异的气调性能获得气体阻隔性能适中的材料,提高了保鲜膜的气调功能,具有气调性能好,对水果保鲜效果佳的优点;此外,本发明可以通过调节聚己二酸对苯二甲酸丁二醇酯和可生物降解聚酯的不同配比,获得具有气调效果各不相同的多种气调膜,适用于多种具有不同呼吸特性的水果的保鲜。
3、本发明通过在保鲜膜材料中加入光催化型抗菌剂,为气调膜提供了抗菌效果,减少了细菌的数量以及抑制了细菌的生长,避免了细菌的大量滋生对水果的破坏,从而使得水果的保鲜期得到了延长;同时,本发明还利用光催化型抗菌剂作为分解乙烯的催化剂,能够将包装内的乙烯分解,从而减缓了水果的进一步成熟的速度,延长了水果的货架期,而通过进一步与少量的三价铁离子和/或氧化石墨烯和/或贵金属离子进行复配,促进了光催化型抗菌剂电子与空穴的分离,提高了活性自由基的产量,降低了光催化型抗菌剂被激活的能带,使其在可见光波段就能够发挥催化乙烯分解的作用,从而提升了催化分解乙烯的能力,更进一步的延长了水果的货架期。
为了证明本发明保鲜膜的保鲜效果,发明人做了如下实验:
将购买于超市中已成熟的香蕉和芒果,各取两份,其中一份香蕉装入实施例1制成的气调保鲜袋中,一份芒果装入实施例4制成的气调保鲜袋中,均密封,在室温下储存;另一份香蕉和芒果直接于室温下储存。
两份香蕉储存7天的变化如图1所示,失重率如图2所示,由图1和图2可以看出,未经本发明保鲜膜密封的香蕉的腐败程度明显高于经过本发明保鲜膜密封的香蕉,同时,失重率更是明显高于经过本发明保鲜膜密封的香蕉。
两份芒果储存19天的变化如图3所示,失重率如图4所示,由图3和图4可以看出,未经本发明保鲜膜密封的芒果的腐败程度明显高于经过本发明保鲜膜密封的芒果,同时,失重率更是明显高于经过本发明保鲜膜密封的芒果。
附图说明
附图1为香蕉储存7天的变化;
附图2为香蕉储存7天的失重率;
附图3为香蕉储存19天的变化;
附图4为香蕉储存19天的失重率。
具体实施方式
下面结合实施例对本发明作进一步的说明,但并不作为对本发明限制的依据。
本发明的实施例
实施例1
一种用于延长高呼吸强度水果货架期的可生物降解气调膜由包含以下重量份的组分制作而成:以重量份计,由PBAT 60份、PLA 33.49份、纳米二氧化钛1份、三氯化铁0.01份、马来酸酐接枝PBAT 5份和硅藻土0.5份组成,然后将上述组分在60℃下过夜烘干,混合均匀,由喂料口加入双螺杆挤出机中,产物经水冷后切粒。然后经吹膜机吹塑成膜,冷却后收卷,即得到所述气调膜。其中双螺杆挤出机的进料口温度为100℃,二区到五区温度为160℃;吹膜机进料口温度为145℃,余段温度为155℃。
实施例2
一种用于延长高呼吸强度水果货架期的可生物降解气调膜由包含以下重量份的组分制作而成:以重量份计,由PBAT 80份、聚碳酸亚丙酯12.69份、纳米二氧化钛4份、氧化石墨烯0.01份、丙烯酸接枝聚碳酸亚丙酯3份和二氧化硅0.3份组成,然后将上述组分在60℃下过夜烘干,混合均匀,由喂料口加入双螺杆挤出机中,产物经水冷后切粒。然后经吹膜机吹塑成膜,冷却后收卷,即得到所述气调膜。其中双螺杆挤出机的进料口温度为90℃,二区到五区温度为150℃;吹膜机进料口温度为140℃,余段温度为150℃。
实施例3
一种用于延长高呼吸强度水果货架期的可生物降解气调膜由包含以下重量份的组分制作而成:以重量份计,由PBAT 85份、聚丁二酸-己二酸-丁二醇酯5.90份、纳米氧化锌8份、纳米金离子及纳米银离子共0.001份、噁唑啉接枝PBAT 1份和二氧化硅0.1份组成,然后将上述组分在60℃下过夜烘干,混合均匀,由喂料口加入双螺杆挤出机中,产物经水冷后切粒。然后经吹膜机吹塑成膜,冷却后收卷,即得到所述气调膜。其中双螺杆挤出机的进料口温度为95℃,二区到五区温度为155℃;吹膜机进料口温度为143℃,余段温度为152℃。
实施例4
一种用于延长高呼吸强度水果货架期的可生物降解气调膜由包含以下重量份的组分制作而成:以重量份计,由PBAT 85份、聚丁二酸丁二醇酯8.90份、纳米二氧化钛3份、氧化铁0.001份、马来酸酐接枝聚丁二酸丁二醇酯3份和油酸酰胺0.1份组成,然后将上述组分在60℃下过夜烘干,混合均匀,由喂料口加入双螺杆挤出机中,产物经水冷后切粒。然后经吹膜机吹塑成膜,冷却后收卷,即得到所述气调膜。其中双螺杆挤出机的进料口温度为105℃,二区到五区温度为165℃;吹膜机进料口温度为148℃,余段温度为158℃。
实施例5
一种用于延长高呼吸强度水果货架期的可生物降解气调膜由包含以下重量份的组分制作而成:以重量份计,由PBAT 50份、PLA50份、纳米二氧化钛1份、氧化铁0.001份、马来酸酐接枝PLA 1份和油酸酰胺0.1份组成,然后将上述组分在50℃下过夜烘干,混合均匀,由喂料口加入双螺杆挤出机中,产物经水冷后切粒。然后经吹膜机吹塑成膜,冷却后收卷,即得到所述气调膜。其中双螺杆挤出机的进料口温度为110℃,二区到五区温度为170℃;吹膜机进料口温度为150℃,余段温度为160℃。
实施例6
一种用于延长高呼吸强度水果货架期的可生物降解气调膜由包含以下重量份的组分制作而成:以重量份计,由PBAT99份、PLA 5份、纳米二氧化钛10份、氧化铁0.1份、马来酸酐接枝PBAT5份和油酸酰胺0.5份组成,然后将上述组分在70℃下过夜烘干,混合均匀,由喂料口加入双螺杆挤出机中,产物经水冷后切粒。然后经吹膜机吹塑成膜,冷却后收卷,即得到所述气调膜。其中双螺杆挤出机的进料口温度为94℃,二区到五区温度为156℃;吹膜机进料口温度为147℃,余段温度为153℃。
以上所述,仅为本发明创造较佳的具体实施方式,但本发明创造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创造揭露的技术范围内,根据本发明创造的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明创造的保护范围之内。
Claims (9)
1.一种延长水果货架期的可生物降解气调膜,其特征在于:以重量份计,包括有聚己二酸对苯二甲酸丁二醇酯50-99份、可生物降解聚酯5-50份、光催化型抗菌剂1-10份、三价铁离子和/或氧化石墨烯和/或贵金属离子0.001-0.1份、相容剂1-5份和开口剂0.1-0.5份。
2.根据权利要求1所述的延长水果货架期的可生物降解气调膜,其特征在于:所述可生物降解聚酯为聚乳酸、聚碳酸亚丙酯、聚丁二酸丁二醇酯或聚丁二酸-己二酸-丁二醇酯中的一种或任意两种。
3.根据权利要求1所述的延长水果货架期的可生物降解气调膜,其特征在于:所述光催化型抗菌剂为纳米二氧化钛或纳米氧化锌。
4.根据权利要求1所述的延长水果货架期的可生物降解气调膜,其特征在于:所述三价铁离子为三氯化铁、硝酸铁或氧化铁。
5.根据权利要求1所述的延长水果货架期的可生物降解气调膜,其特征在于:所述贵金属离子为纳米金离子或纳米银离子。
6.根据权利要求1所述的延长水果货架期的可生物降解气调膜,其特征在于:所述相容剂为马来酸酐接枝、丙烯酸接枝、环氧树脂接枝或噁唑啉接枝中的一种。
7.根据权利要求1所述的延长水果货架期的可生物降解气调膜,其特征在于:所述开口剂为硅藻土、滑石粉、二氧化硅、芥酸酰胺或油酸酰胺中的一种或任意两种。
8.一种制备权利要求1所述的延长水果货架期的可生物降解气调膜的方法,其特征在于:步骤如下:
(1)将聚己二酸对苯二甲酸丁二醇酯、可生物降解聚酯、光催化型抗菌剂、三价铁离子或氧化石墨烯或贵金属离子、相容剂和开口剂烘干;
(2)将步骤(1)中烘干的物料按比例混合均匀,由喂料口加入双螺杆挤出机中,产物经水冷后切粒,然后经吹膜机吹塑成膜,冷却后收卷,即得到所述气调膜。
9.根据权利要求8所述的延长水果货架期的可生物降解气调膜的制备方法,其特征在于:步骤(1)所述烘干是在50-70℃下过夜烘干;步骤(2)所述双螺杆挤出机的进料口温度为90-110℃,二区到五区温度为150-170℃;所述吹膜机进料口温度为140-150℃,余段温度为150-160℃。
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