CN114953676A - 一种包装箱用抗菌塑料材料及其制备方法 - Google Patents

一种包装箱用抗菌塑料材料及其制备方法 Download PDF

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CN114953676A
CN114953676A CN202210590766.4A CN202210590766A CN114953676A CN 114953676 A CN114953676 A CN 114953676A CN 202210590766 A CN202210590766 A CN 202210590766A CN 114953676 A CN114953676 A CN 114953676A
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CN114953676B (zh
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张晓警
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Xianyang Kuncaida New Material Technology Co ltd
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    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/32Layered products comprising a layer of synthetic resin comprising polyolefins
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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    • B29C48/07Flat, e.g. panels
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
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    • BPERFORMING OPERATIONS; TRANSPORTING
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Abstract

本发明公开了一种包装箱用抗菌塑料材料及其制备方法,包装箱用抗菌材料包括上层和下层;制备上层的原料:线性低密度聚乙烯、马来酸酐接枝聚乙烯、改性甲壳素、滑石粉、有机化膨润土、抗氧剂、合成植物酯、纳米二氧化钛;制备下层的原料:线性低密度聚乙烯、马来酸酐接枝聚乙烯、滑石粉、有机化膨润土、抗氧剂、合成植物酯、纳米二氧化硅。本发明包装箱用抗菌塑料材料在上层薄膜上设置有均匀地微孔,可以使包装物品与上层薄膜之间更好的接触,增加抗菌面积,提高抗菌效果,在使用过程中,可以将抗菌塑料的下层与包装箱的内表面进行贴合,两层结构的包装设计增强了包装箱体的强度。

Description

一种包装箱用抗菌塑料材料及其制备方法
技术领域
本发明涉及塑料加工技术领域,具体涉及一种包装箱用抗菌塑料材料及其制备方法。
背景技术
随着经济的发展、社会文明的高度进步,人们对生活质量的提高也更加迫切,主要体现在人们对健康的关注,以及人类对抗菌重要性的认识。包装箱在储存物品的过程中,易受环境中温度、湿度、盐分等不良因素的影响和破坏,因其包装箱内物品的污染或破坏。因此,包装箱的抗菌性能显得尤其重要。
现有的抗菌塑料已经应用在大型家电、通讯器材、汽车制造等方面,其中采用纳米技术改性的无机抗菌剂最为人们青睐。这类抗菌剂的粒径细,与细菌的接触面积达,同时还可以穿透细菌的细胞壁而进行细胞体内,破坏细胞合成酶的活性,使细胞丧失分类增殖能力而死亡,从而达到抗菌的目的。但采用单一种类的抗菌剂往往会存在抗菌长效性差、抗菌效果不佳等问题。
中国专利CN109233081A公开了一种塑料包装袋的制备方法,该塑料包装袋以重量份计由下列组分组成:线性低密度聚乙稀颗粒85-100份,乙烯-醋酸乙烯酯树脂颗粒25-30份,碳酸钙粉15-16份,竹纤维12-15份,复合抗菌剂8-10份,邻苯二甲酸酯8-10份,纳米Au36(SCH3)24团簇1-1.5份。但该专利制备的塑料包装袋的抗菌性能不佳。
发明内容
有鉴于此,本发明提供一种包装箱用抗菌塑料材料及其制备方法,以解决上述技术问题。
为实现上述目的,本发明提供如下技术方案:一种包装箱用抗菌塑料材料,所述包装箱用抗菌材料包括上层和下层;制备所述上层的原料按其重量份包括:线性低密度聚乙烯100份、马来酸酐接枝聚乙烯1.2份~3.5份、改性甲壳素12份~20份、滑石粉0.25份~0.8份、有机化膨润土4.2份~6.8份、抗氧剂0.06份~0.18份、合成植物酯0.5份~1.5份、纳米二氧化钛0.12份~0.24份;制备所述下层的原料按其重量份包括:线性低密度聚乙烯100份、马来酸酐接枝聚乙烯1.2份~3.5份、滑石粉0.25份~0.8份、有机化膨润土4.2份~6.8份、抗氧剂0.06份~0.18份、合成植物酯0.5份~1.5份、纳米二氧化硅0.12份~0.24份。
进一步地,制备所述上层的原料按其重量份包括:线性低密度聚乙烯100份、马来酸酐接枝聚乙烯2.3份、改性甲壳素16份、滑石粉0.5份、有机化膨润土5.5份、抗氧剂0.12份、合成植物酯1.0份、纳米二氧化钛0.18份。
进一步地,制备所述下层的原料按其重量份包括:线性低密度聚乙烯100份、马来酸酐接枝聚乙烯2.3份、滑石粉0.5份、有机化膨润土5.5份、抗氧剂0.12份、合成植物酯1.0份、纳米二氧化硅0.18份。
进一步地,所述改性甲壳素的制备方法包括:将5份甲壳素溶于50份~150份浓度为4wt%~10wt%的醋酸溶液中,再滴加1.5份~4份苯甲醛,搅拌混合16小时,经冷冻离心、洗涤、干燥,得到预处理物;将预处理物分散到浓度为4wt%~10wt%的冰醋酸溶液中,加入水杨酸,搅拌混合,得到预混液I;将司盘80、硬脂酸镁加入到石蜡油中,配成预混液II;将预混液I加入到预混液II中,搅拌至呈乳液状,在放到40℃水浴中搅拌混合20分钟~40分钟,再加入20份~40份浓度为40wt%的明胶溶液,继续搅拌40分钟,滴加戊二醛,再升温至55℃,搅拌混合40分钟,待静置分层后将下层物质洗涤3次,烘干得到改性甲壳素。
进一步地,所述水杨酸与甲壳素的使用重量比为1:0.4~1.2。
进一步地,所述预混液II中各原料的添加重量份为10份~18份司盘80、1.5份~2.55份硬脂酸镁、30份~45份石蜡油。
本发明的另一发明目的在于提供一种包装箱用抗菌塑料材料的制备方法,包括以下步骤:
步骤一,分别称取制备上层和下层的原料;
步骤二,上层原料准备:将上层原料中所述重量份的改性甲壳素、滑石粉、有机化膨润土和纳米二氧化钛进行混合,得到预混料I,将上层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至105℃~112℃,搅拌混合10分钟后加入预混料I,继续搅拌混合30分钟,得到预混料A;
步骤三,下层原料准备:将下层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化硅进行混合,得到预混料II,将下层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至105℃~112℃,搅拌混合10分钟后加入预混料II,继续搅拌混合30分钟,得到预混料B;
步骤四,将预混料A和预混料B分别加入到预热好的1号挤出机、2号挤出机的料斗内,经挤出机的T型模口共流延挤出,在流动状态下吹胀,冷却定型,在上层塑料材料的表面均匀地针刺细小微孔,再经夹平、切边、收卷,得到包装箱用抗菌塑料材料。
进一步地,步骤四中,所述挤出机的工作温度为108℃~120℃。
进一步地,步骤四中,所述包装箱用抗菌塑料材料的厚度在20微米~40微米。
进一步地,步骤四中,所述细小微孔的孔深在10微米~15微米,孔径的间距在2mm~3mm。
从上述的技术方案可以看出,本发明的优点是:
1.本发明包装箱用抗菌塑料材料由上下两层组成,上下两层原料配方组成相似,在上层原料中特别添加有纳米二氧化钛和甲壳素,可以提高塑料材料的抗菌性能,并且将甲壳素与水杨酸造粒处理,可以得到球形的壳聚糖微球,提高抗菌的稳定性和抗腐性;
2.本发明包装箱用抗菌塑料材料在上层薄膜上设置有均匀地微孔,可以使包装物品与上层薄膜之间更好的接触,增加抗菌面积,提高抗菌效果,在使用过程中,可以将抗菌塑料的下层与包装箱的内表面进行贴合,两层结构的包装设计增强了包装箱体的强度;
3.本发明包装箱用抗菌塑料材料的原料配比适宜,两层结合性好,材料安全健康,并且制备方法简单,工艺易操作,经济效益高。
除了上面所描述的目的、特征和优点之外,本发明还有其它的目的、特征和优点。下面将对本发明作进一步详细的说明。
具体实施方式
以下对本发明的实施例进行详细说明,但是本发明可以由权利要求限定和覆盖的多种不同方式实施。
实施例1~实施例4、对比例1~2中包装箱用抗菌塑料材料的原料配方如表1所示。
Figure BDA0003667237490000041
Figure BDA0003667237490000051
实施例1
一种包装箱用抗菌塑料材料及其制备方法
改性甲壳素的制备:将5份甲壳素溶于50份浓度为4wt%的醋酸溶液中,再滴加1.5份苯甲醛,搅拌混合16小时,经冷冻离心、洗涤、干燥,得到预处理物;将预处理物分散到浓度为4wt%的冰醋酸溶液中,加入水杨酸,水杨酸与甲壳素的使用重量比为1:0.4,搅拌混合,得到预混液I;将10份司盘80、1.5份硬脂酸镁加入到30份石蜡油中,配成预混液II;将预混液I加入到预混液II中,搅拌至呈乳液状,在放到40℃水浴中搅拌混合20分钟,再加入20份浓度为40wt%的明胶溶液,继续搅拌40分钟,滴加戊二醛,再升温至55℃,搅拌混合40分钟,待静置分层后将下层物质洗涤3次,烘干得到改性甲壳素。
甲壳素具有一定的杀菌作用,经改性处理后可在甲壳素表面形成多个抗菌活性位,提高抗菌性能。
包装箱用抗菌塑料材料的制备方法,包括以下步骤:
步骤一,分别称取制备上层和下层的原料;
步骤二,上层原料准备:将上层原料中所述重量份的改性甲壳素、滑石粉、有机化膨润土和纳米二氧化钛进行混合,得到预混料I,将上层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至105℃,搅拌混合10分钟后加入预混料I,继续搅拌混合30分钟,得到预混料A;
步骤三,下层原料准备:将下层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化硅进行混合,得到预混料II,将下层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至105℃,搅拌混合10分钟后加入预混料II,继续搅拌混合30分钟,得到预混料B;
步骤四,将预混料A和预混料B分别加入到预热好的1号挤出机、2号挤出机的料斗内,经挤出机的T型模口共流延挤出,在流动状态下吹胀,冷却定型,在上层塑料材料的表面均匀地针刺细小微孔,再经夹平、切边、收卷,得到包装箱用抗菌塑料材料;所述挤出机的工作温度为108℃;所述包装箱用抗菌塑料材料的厚度在20微米;所述细小微孔的孔深在10微米,孔径的间距在2mm。
实施例2
一种包装箱用抗菌塑料材料及其制备方法
改性甲壳素的制备:将5份甲壳素溶于150份浓度为10wt%的醋酸溶液中,再滴加4份苯甲醛,搅拌混合16小时,经冷冻离心、洗涤、干燥,得到预处理物;将预处理物分散到浓度为10wt%的冰醋酸溶液中,加入水杨酸,水杨酸与甲壳素的使用重量比为1:1.2,搅拌混合,得到预混液I;将18份司盘80、2.55份硬脂酸镁加入到45份石蜡油中,配成预混液II;将预混液I加入到预混液II中,搅拌至呈乳液状,在放到40℃水浴中搅拌混合40分钟,再加入40份浓度为40wt%的明胶溶液,继续搅拌40分钟,滴加戊二醛,再升温至55℃,搅拌混合40分钟,待静置分层后将下层物质洗涤3次,烘干得到改性甲壳素。
甲壳素具有一定的杀菌作用,经改性处理后可在甲壳素表面形成多个抗菌活性位,提高抗菌性能。
包装箱用抗菌塑料材料的制备方法,包括以下步骤:
步骤一,分别称取制备上层和下层的原料;
步骤二,上层原料准备:将上层原料中所述重量份的改性甲壳素、滑石粉、有机化膨润土和纳米二氧化钛进行混合,得到预混料I,将上层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至112℃,搅拌混合10分钟后加入预混料I,继续搅拌混合30分钟,得到预混料A;
步骤三,下层原料准备:将下层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化硅进行混合,得到预混料II,将下层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至112℃,搅拌混合10分钟后加入预混料II,继续搅拌混合30分钟,得到预混料B;
步骤四,将预混料A和预混料B分别加入到预热好的1号挤出机、2号挤出机的料斗内,经挤出机的T型模口共流延挤出,在流动状态下吹胀,冷却定型,在上层塑料材料的表面均匀地针刺细小微孔,再经夹平、切边、收卷,得到包装箱用抗菌塑料材料;所述挤出机的工作温度为120℃;所述包装箱用抗菌塑料材料的厚度在40微米;所述细小微孔的孔深在15微米,孔径的间距在3mm。
实施例3
一种包装箱用抗菌塑料材料及其制备方法
改性甲壳素的制备:将5份甲壳素溶于100份浓度为7wt%的醋酸溶液中,再滴加2.7份苯甲醛,搅拌混合16小时,经冷冻离心、洗涤、干燥,得到预处理物;将预处理物分散到浓度为7wt%的冰醋酸溶液中,加入水杨酸,水杨酸与甲壳素的使用重量比为1:0.8,搅拌混合,得到预混液I;将14份司盘80、2.0份硬脂酸镁加入到37份石蜡油中,配成预混液II;将预混液I加入到预混液II中,搅拌至呈乳液状,在放到40℃水浴中搅拌混合30分钟,再加入30份浓度为40wt%的明胶溶液,继续搅拌40分钟,滴加戊二醛,再升温至55℃,搅拌混合40分钟,待静置分层后将下层物质洗涤3次,烘干得到改性甲壳素。
甲壳素具有一定的杀菌作用,经改性处理后可在甲壳素表面形成多个抗菌活性位,提高抗菌性能。
包装箱用抗菌塑料材料的制备方法,包括以下步骤:
步骤一,分别称取制备上层和下层的原料;
步骤二,上层原料准备:将上层原料中所述重量份的改性甲壳素、滑石粉、有机化膨润土和纳米二氧化钛进行混合,得到预混料I,将上层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至110℃,搅拌混合10分钟后加入预混料I,继续搅拌混合30分钟,得到预混料A;
步骤三,下层原料准备:将下层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化硅进行混合,得到预混料II,将下层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至110℃,搅拌混合10分钟后加入预混料II,继续搅拌混合30分钟,得到预混料B;
步骤四,将预混料A和预混料B分别加入到预热好的1号挤出机、2号挤出机的料斗内,经挤出机的T型模口共流延挤出,在流动状态下吹胀,冷却定型,在上层塑料材料的表面均匀地针刺细小微孔,再经夹平、切边、收卷,得到包装箱用抗菌塑料材料;所述挤出机的工作温度为114℃;所述包装箱用抗菌塑料材料的厚度在30微米;所述细小微孔的孔深在12微米,孔径的间距在2.5mm。
实施例4
一种包装箱用抗菌塑料材料及其制备方法
改性甲壳素的制备:将5份甲壳素溶于70份浓度为6wt%的醋酸溶液中,再滴加2份苯甲醛,搅拌混合16小时,经冷冻离心、洗涤、干燥,得到预处理物;将预处理物分散到浓度为8wt%的冰醋酸溶液中,加入水杨酸,水杨酸与甲壳素的使用重量比为1:1,搅拌混合,得到预混液I;将12份司盘80、1.8份硬脂酸镁加入到40份石蜡油中,配成预混液II;将预混液I加入到预混液II中,搅拌至呈乳液状,在放到40℃水浴中搅拌混合25分钟,再加入35份浓度为40wt%的明胶溶液,继续搅拌40分钟,滴加戊二醛,再升温至55℃,搅拌混合40分钟,待静置分层后将下层物质洗涤2次,烘干得到改性甲壳素。
甲壳素具有一定的杀菌作用,经改性处理后可在甲壳素表面形成多个抗菌活性位,提高抗菌性能。
包装箱用抗菌塑料材料的制备方法,包括以下步骤:
步骤一,分别称取制备上层和下层的原料;
步骤二,上层原料准备:将上层原料中所述重量份的改性甲壳素、滑石粉、有机化膨润土和纳米二氧化钛进行混合,得到预混料I,将上层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至108℃,搅拌混合10分钟后加入预混料I,继续搅拌混合30分钟,得到预混料A;
步骤三,下层原料准备:将下层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化硅进行混合,得到预混料II,将下层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至108℃,搅拌混合10分钟后加入预混料II,继续搅拌混合30分钟,得到预混料B;
步骤四,将预混料A和预混料B分别加入到预热好的1号挤出机、2号挤出机的料斗内,经挤出机的T型模口共流延挤出,在流动状态下吹胀,冷却定型,在上层塑料材料的表面均匀地针刺细小微孔,再经夹平、切边、收卷,得到包装箱用抗菌塑料材料;所述挤出机的工作温度为1140℃;所述包装箱用抗菌塑料材料的厚度在25微米;所述细小微孔的孔深在10微米,孔径的间距在3mm。
对比例1
一种包装箱用抗菌塑料材料及其制备方法
包装箱用抗菌塑料材料的制备方法,包括以下步骤:
步骤一,分别称取制备上层和下层的原料;
步骤二,上层原料准备:将上层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化钛进行混合,得到预混料I,将上层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至110℃,搅拌混合10分钟后加入预混料I,继续搅拌混合30分钟,得到预混料A;
步骤三,下层原料准备:将下层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化硅进行混合,得到预混料II,将下层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至110℃,搅拌混合10分钟后加入预混料II,继续搅拌混合30分钟,得到预混料B;
步骤四,将预混料A和预混料B分别加入到预热好的1号挤出机、2号挤出机的料斗内,经挤出机的T型模口共流延挤出,在流动状态下吹胀,冷却定型,在上层塑料材料的表面均匀地针刺细小微孔,再经夹平、切边、收卷,得到包装箱用抗菌塑料材料;所述挤出机的工作温度为114℃;所述包装箱用抗菌塑料材料的厚度在30微米;所述细小微孔的孔深在12微米,孔径的间距在2.5mm。
对比例2
一种包装箱用抗菌塑料材料及其制备方法
包装箱用抗菌塑料材料的制备方法,包括以下步骤:
步骤一,分别称取制备上层和下层的原料;
步骤二,上层原料准备:将上层原料中所述重量份的甲壳素、滑石粉、有机化膨润土和纳米二氧化钛进行混合,得到预混料I,将上层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至110℃,搅拌混合10分钟后加入预混料I,继续搅拌混合30分钟,得到预混料A;
步骤三,下层原料准备:将下层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化硅进行混合,得到预混料II,将下层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至110℃,搅拌混合10分钟后加入预混料II,继续搅拌混合30分钟,得到预混料B;
步骤四,将预混料A和预混料B分别加入到预热好的1号挤出机、2号挤出机的料斗内,经挤出机的T型模口共流延挤出,在流动状态下吹胀,冷却定型,在上层塑料材料的表面均匀地针刺细小微孔,再经夹平、切边、收卷,得到包装箱用抗菌塑料材料;所述挤出机的工作温度为114℃;所述包装箱用抗菌塑料材料的厚度在30微米;所述细小微孔的孔深在12微米,孔径的间距在2.5mm。
实验例
为了进一步说明本发明的技术进步性,现采用实验进一步说明。
表1
Figure BDA0003667237490000111
Figure BDA0003667237490000121
以上仅为本发明的优选实施例而已,并不用于限制本发明,对于本领域的技术人员来说,本发明可以有各种更改和变化。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (10)

1.一种包装箱用抗菌塑料材料,其特征在于,所述包装箱用抗菌材料包括上层和下层;制备所述上层的原料按其重量份包括:线性低密度聚乙烯100份、马来酸酐接枝聚乙烯1.2份~3.5份、改性甲壳素12份~20份、滑石粉0.25份~0.8份、有机化膨润土4.2份~6.8份、抗氧剂0.06份~0.18份、合成植物酯0.5份~1.5份、纳米二氧化钛0.12份~0.24份;制备所述下层的原料按其重量份包括:线性低密度聚乙烯100份、马来酸酐接枝聚乙烯1.2份~3.5份、滑石粉0.25份~0.8份、有机化膨润土4.2份~6.8份、抗氧剂0.06份~0.18份、合成植物酯0.5份~1.5份、纳米二氧化硅0.12份~0.24份。
2.根据权利要求1所述的包装箱用抗菌塑料材料,其特征在于,制备所述上层的原料按其重量份包括:线性低密度聚乙烯100份、马来酸酐接枝聚乙烯2.3份、改性甲壳素16份、滑石粉0.5份、有机化膨润土5.5份、抗氧剂0.12份、合成植物酯1.0份、纳米二氧化钛0.18份。
3.根据权利要求1所述的包装箱用抗菌塑料材料,其特征在于,制备所述下层的原料按其重量份包括:线性低密度聚乙烯100份、马来酸酐接枝聚乙烯2.3份、滑石粉0.5份、有机化膨润土5.5份、抗氧剂0.12份、合成植物酯1.0份、纳米二氧化硅0.18份。
4.根据权利要求1所述的包装箱用抗菌塑料材料,其特征在于,所述改性甲壳素的制备方法包括:将5份甲壳素溶于50份~150份浓度为4wt%~10wt%的醋酸溶液中,再滴加1.5份~4份苯甲醛,搅拌混合16小时,经冷冻离心、洗涤、干燥,得到预处理物;将预处理物分散到浓度为4wt%~10wt%的冰醋酸溶液中,加入水杨酸,搅拌混合,得到预混液I;将司盘80、硬脂酸镁加入到石蜡油中,配成预混液II;将预混液I加入到预混液II中,搅拌至呈乳液状,在放到40℃水浴中搅拌混合20分钟~40分钟,再加入20份~40份浓度为40wt%的明胶溶液,继续搅拌40分钟,滴加戊二醛,再升温至55℃,搅拌混合40分钟,待静置分层后将下层物质洗涤3次,烘干得到改性甲壳素。
5.根据权利要求4所述的包装箱用抗菌塑料材料,其特征在于,所述水杨酸与甲壳素的使用重量比为1:0.4~1.2。
6.根据权利要求4所述的包装箱用抗菌塑料材料,其特征在于,所述预混液II中各原料的添加重量份为10份~18份司盘80、1.5份~2.55份硬脂酸镁、30份~45份石蜡油。
7.一种根据权利要求1~6中任一项所述的包装箱用抗菌塑料材料的制备方法,其特征在于,包括以下步骤:
步骤一,分别称取制备上层和下层的原料;
步骤二,上层原料准备:将上层原料中所述重量份的改性甲壳素、滑石粉、有机化膨润土和纳米二氧化钛进行混合,得到预混料I,将上层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至105℃~112℃,搅拌混合10分钟后加入预混料I,继续搅拌混合30分钟,得到预混料A;
步骤三,下层原料准备:将下层原料中所述重量份的滑石粉、有机化膨润土和纳米二氧化硅进行混合,得到预混料II,将下层原料中所述重量份的线性低密度聚乙烯、马来酸酐接枝聚乙烯、抗氧剂和合成植物酯投入到高混机内,升温至105℃~112℃,搅拌混合10分钟后加入预混料II,继续搅拌混合30分钟,得到预混料B;
步骤四,将预混料A和预混料B分别加入到预热好的1号挤出机、2号挤出机的料斗内,经挤出机的T型模口共流延挤出,在流动状态下吹胀,冷却定型,在上层塑料材料的表面均匀地针刺细小微孔,再经夹平、切边、收卷,得到包装箱用抗菌塑料材料。
8.根据权利要求7所述的制备方法,其特征在于,步骤四中,所述挤出机的工作温度为108℃~120℃。
9.根据权利要求7所述的制备方法,其特征在于,步骤四中,所述包装箱用抗菌塑料材料的厚度在20微米~40微米。
10.根据权利要求7所述的制备方法,其特征在于,步骤四中,所述细小微孔的孔深在10微米~15微米,孔径的间距在2mm~3mm。
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