CN116875004B - 一种pbat母粒及其制备方法及pbat保鲜膜 - Google Patents
一种pbat母粒及其制备方法及pbat保鲜膜 Download PDFInfo
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- CN116875004B CN116875004B CN202311063862.4A CN202311063862A CN116875004B CN 116875004 B CN116875004 B CN 116875004B CN 202311063862 A CN202311063862 A CN 202311063862A CN 116875004 B CN116875004 B CN 116875004B
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Classifications
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- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
- C08J3/226—Compounding polymers with additives, e.g. colouring using masterbatch techniques using a polymer as a carrier
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/04—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
- C08G12/06—Amines
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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Abstract
本申请涉及高分子材料领域,具体公开了一种PBAT母粒及其制备方法及PBAT保鲜膜。一种PBAT母粒,包括以下重量份的原料:20‑50份PBAT、0.5‑2份润滑剂、0.5‑2份抗氧剂、2‑3份相容剂、5‑15份无机微粉、5‑10份吸湿材料、5‑10有机多孔材料、0.6‑2.2份防霉剂。本申请的PBAT母粒可用于制备PBAT保鲜膜,其具有保鲜膜的内表面不易凝结水滴,透湿效果好,保鲜能力强的优点。
Description
技术领域
本申请涉及高分子材料技术领域,更具体地说,它涉及一种PBAT母粒及其制备方法及PBAT保鲜膜。
背景技术
目前,在日常生产生活中,保鲜膜已经被广泛应用于家庭生活及部分包装产业,这种被广泛应用的塑料保鲜膜基本上都是传统的石油基的PE保鲜膜。这种保鲜膜由于厚度非常薄,很难被回收利用,废弃后在自然界也不会降解,造成了白色污染。
PBAT是聚己二酸和对苯二甲酸丁二酯共聚物,具有优良的生物降解性,同时兼具PBT和PBAT的特性,既有较好的延展性和断裂伸长率,也有较好的耐热性和冲击性能,因此目前备受世界各国专家和学者的关注,成为目前生物降解塑料研究的热点之一。
现有技术中,申请号为CN201811189636.X的中国发明专利文件公开了一种生物可降解保鲜膜,其主要由以下重量份的原料制成:PBAT 50-65份、聚乳酸20-40份、改性淀粉15-30份、生物降解脂肪族-芳香族共聚酯3-10份、甲基羟丙基纤维素醚3-10份、纳米滑石粉2-8份、扩链剂0.1-0.5份、抗氧剂0.2-0.8份、润滑剂0.2-0.6份。
针对上述中的相关技术,发明人发现现有的这种生物可降解保鲜膜虽然具有较好的生物可降解性、韧性、可塑性和强度,但用于果蔬保鲜时,果蔬自身的呼吸作用产生在保鲜膜内壁结露容易导致细菌滋生及霉变,进而加速果蔬的腐烂。
发明内容
为了提高PBAT保鲜膜的防结露效果,延长保鲜能力,本申请提供一种PBAT母粒及其制备方法和PBAT保鲜膜。
第一方面,本申请提供一种PBAT母粒,采用如下的技术方案:
一种PBAT母粒,包括以下重量份的原料:20-50份PBAT、0.5-2份润滑剂、0.5-2份抗氧剂、2-3份相容剂、5-15份无机微粉、5-10份吸湿材料、5-10份有机多孔材料、0.6-2.2份防霉剂。
通过采用上述技术方案,在PBAT母粒中添加有吸湿材料和有机多孔材料,当PBAT母粒制成保鲜膜,对果蔬进行包装时,果蔬在保鲜膜内因呼吸作用而产生水雾,吸湿材料具有很强的吸水性,在水蒸气到达保鲜膜时,保鲜膜将水蒸气吸收,并在达到一定浓度后,向保鲜膜内缓慢释放水蒸气,进而有效抑制果蔬的水分散失,同时防霉剂的存在能防止果蔬等发生霉变;而有机多孔材料的多孔结构,能使果蔬自身释放的乙烯从保鲜膜内排出,在保鲜膜内产生的水蒸气无法完全被保湿材料吸收时,便于水蒸气从保鲜膜内释放,以防水蒸气难以被保湿材料吸收而在保鲜膜内表面凝结而形成雾滴;无机微粉作为开口剂,在PBAT母粒经熔融吹塑成膜时,其因拉伸作用而与PBAT产生分离,形成微孔,从而便于水蒸气的渗透。
可选的,所述吸湿材料包括高吸水树脂和多孔二氧化硅,高吸水树脂和多孔二氧化硅的质量比为0.3-0.5:1。
通过采用上述技术方案,高吸水树脂能吸收果蔬产生的水蒸气,多孔二氧化硅具有丰富的孔道结构,存在大量的介孔和大孔结构,可以作为吸附水分子的储存空间,当空气中水蒸气分压高于孔道内凹液面上水的饱和蒸气压时,水蒸气被吸附,反之则发生脱附,高吸水树脂和多孔二氧化硅配合,能吸收果蔬因呼吸作用而产生的水蒸气,并且二氧化硅还能在吸收饱和时,释放水蒸气,使果蔬保持新鲜。
可选的,所述多孔二氧化硅经过以下预处理:
将氧化镁和多孔二氧化硅混合,加入氢氧化钠、结晶氯化铝和蒸馏水,升温至110-120℃下搅拌8-10h,过滤,烘干。
通过采用上述技术方案,经过水热处理后的多孔二氧化硅表面包覆有大量的片状氢氧化铝,多孔二氧化硅表面经沉淀包覆后,片状的氢氧化铝增大了多孔二氧化硅的比表面积,增加了水分子与多孔二氧化硅的碰撞概率,有助于水蒸气分子吸附至多孔二氧化硅上,多孔二氧化硅的孔隙结构和片状氢氧化铝可以通过范德华力对水分子产生较大的物理吸附,多孔二氧化硅天然的孔隙结构为水分子的存储和运输提供了场所和通道,有利于保鲜膜的吸湿和放湿,氧化镁的加入则能使多孔二氧化硅具有抑菌、防霉作用,从而改善保鲜膜的防腐、延长保质期的能力。
可选的,所述介孔二氧化硅预处理时各原料的重量份如下:1.5-3.5份氧化镁、5-10份多孔二氧化硅、1-2份氢氧化钠、2-4份结晶氯化铝和25-50份蒸馏水。
通过采用上述技术方案,以上用量的各组分对多孔二氧化硅进行预处理,能获得吸湿性和放湿性好,且抑菌作用强的多孔二氧化硅。
可选的,所述有机多孔材料包括摩尔比为1.8-2:3的均苯三甲醛和辛二胺。
通过采用上述技术方案,辛二胺中的胺基和均苯三甲醛中的羰基能发生缩合的席夫碱反应,形成亚胺键,制成超疏水共价的有机多孔材料,其具有微孔和介孔的孔结构,当水蒸气接触内表面时,超疏水表面能在一定程度上降低水蒸气在保鲜膜内表面的黏附,并且多孔结构,能便于水蒸气的渗透,而且有机多孔材料表面因呈现超疏水性,因此有机多孔材料能在PBAT母粒中良好的分散,而有机多孔材料与PBAT基体之间形成一定的空隙,一方面增加了水蒸气透过的自由体积,另一方面,这些孔隙为水蒸气渗透提供了通道,提高了透湿性。
可选的,所述有机多孔材料经过以下预处理:
将有机多孔材料至于质量分数为25-30%的氯化锂溶液中,升温至60-80℃,搅拌80-90min,真空抽滤,干燥,研磨,有机多孔材料与氯化锂溶液的质量比为1:13-15。
通过采用上述技术方案,采用氯化锂对有机多孔材料进行预处理,有机多孔材料的比表面积和比溶剂下降,平均孔径增大,促进了有机多孔材料的物理吸附,大大提高了其吸湿量,但氯化锂溶度过高,会过量沉积在有机多孔材料表面,堵塞有机多孔材料部分纹孔,吸湿量下降;有机多孔材料上布满很多孔道,排列着密集的微孔结构,有机多孔材料经氯化锂沉积后,表面吸附着氯化锂,孔径增大,表面变得粗糙且不规则,但原有的多孔形状未被破坏和改变,从而提高了调湿性能。
可选的,所述PBAT母粒中还含有3-7份除雾剂,所述除雾剂由丝瓜络纤维酸洗后循环浸渍氧化石墨烯分散液后干燥、还原、洗涤制成。
通过采用上述技术方案,果蔬在进行呼吸作用时,释放的能量一部分以热的形式散失,因此会使果蔬的水分蒸发,保鲜膜的内表面会凝结水雾,在丝瓜络纤维上循环浸渍氧化石墨烯,经还原后,形成还原氧化石墨烯,丝瓜络纤维主要成分是纤维素,还含有一定的维生素C、有机酸等成分,具有抗菌抑菌作用,而且其天然的网络结构,还原氧化石墨烯包裹在丝瓜络纤维的表面,而还原氧化石墨烯是一种超疏水材料,当其在丝瓜络纤维上连续分布时,丝瓜络纤维液被赋予了超疏水特性,因此其与PBAT的分散性良好,能均匀分散于PBAT母粒中,而且还原氧化石墨烯改善了丝瓜络纤维的传热性能,因丝瓜络纤维的三维结构为声子传递提供了有效的通道,减少了声子在传递过程中的散射,促进了热量在网络之间的热传输,从而增加了PBAT母粒的散热效果,进而改善了PBAT保鲜膜的散热能力,降低果蔬因呼吸作用产生的热量在保鲜膜内堆积,降低果蔬水蒸气的蒸发,减少水蒸气在保鲜膜内表面的聚集;另外丝瓜网络纤维的加入还能增加PBAT母粒的抑菌性,以及改善PBAT母粒的拉伸强度,改善其抗拉伸能力。
可选的,所述无机微粉选自碳酸钙粉、滑石粉、石英粉、蒙脱石粉、石膏粉中的至少一种。
通过采用上述技术方案,无机微粉与PBAT混合后,在吹塑成膜时,与PBAT发生分离,产生微孔,从而增加透气性和透湿性。
优选的,防霉剂选自山梨酸盐、柠檬酸盐、脱氢醋酸盐、花椒素及儿茶素中的至少一种;
所述润滑剂为EBS、芥酸酰胺、油酸酰胺和硬脂酸锌中的一种或多种;
所述抗氧剂为四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯和三(2,4-二叔丁基苯基)亚磷酸酯中的一种或多种。
通过采用上述技术方案,防霉剂能改善保鲜膜的保鲜能力,防止果蔬腐烂;抗氧剂能提高PBAT的抗氧化性能,更好的提高保鲜膜的使用寿命;润滑剂能使PBAT母粒在经过吹塑成膜后开口性更好,使用性能更加。
第二方面,本申请提供一种PBAT母粒的制备方法,采用如下的技术方案:
一种PBAT母粒的制备方法,包括以下步骤:
根据PBAT母粒的原料用量,称取各原料,混合均匀、熔融、挤出、造粒。
第三方面,本申请提供一种PBAT保鲜膜,采用如下的技术方案:
一种PBAT保鲜膜,包括以下重量份的原料:40-60份PBAT母粒、10-20份PLA、0.1-0.5份抗氧剂、0.2-1份增塑剂、0.2-1份扩链剂、10-20份偶联改性纳米碳酸钙。
通过采用上述技术方案,由PBAT母粒制成的保鲜膜,对果蔬进行保鲜包装时,内表面不易凝结水雾,延长果蔬保质期。
综上所述,本申请具有以下有益效果:
1、由于本申请采用在PBAT母粒中添加吸湿材料和有机多孔材料,吸湿材料和有机多孔材料能吸收果蔬产生的水蒸气,降低水蒸气在保鲜膜内表面的凝结,以防凝结的水雾滴落在包装的果蔬上,引起果蔬腐烂,并且其中添加的防霉剂,也能进一步改善保鲜膜的防腐能力;并且吸湿材料在水蒸气吸收饱和后,能将水蒸气释放至保鲜膜内,以增加果蔬的水分含量,降低果蔬的失重率,保持果蔬的新鲜程度。
2、本申请中优选采用氧化镁、氢氧化镁和结晶氯化铝等对多孔二氧化硅进行预处理,在多孔二氧化硅和氧化镁表面包裹片状氢氧化铝,增加多孔二氧化硅的比表面积,改善其水分吸附力,提高其吸湿和放湿效果,进而改善保鲜膜对水蒸气的吸收能力,防止在内表面凝结成水滴;而且氧化镁的加入使得多孔二氧化硅具有防霉、抑菌效果,从而增强PBAT母粒的抑菌效果,延长果蔬保质期。
3、本申请优选采用氯化锂溶液对有机多孔材料进行处理,有机多孔材料由辛二胺和均苯三甲醛经席夫碱反应制得,在其表面沉积氯化锂,改善有机多孔材料的孔隙率,而且有机多孔材料为疏水性,便于水蒸气的渗透,改善保鲜膜的透湿性。
4、本申请优选采用丝瓜络纤维循环浸渍氧化石墨烯并还原制备除雾剂,还原氧化石墨烯具有疏水性,在丝瓜络纤维表面沉积包覆后,能增加丝瓜络纤维的疏水性,改善水分的渗透效果,而且还能增加丝瓜络纤维的散热效果,以防保鲜膜内热量较大而导致果蔬水蒸气蒸发较多,果蔬失水多而新鲜度下降,另外丝瓜络纤维还具有抗菌效果,并能增强保鲜膜的力学强度。
具体实施方式
有机多孔材料的制备例1
制备例1:以二甲基亚砜为溶剂,配置浓度为0.15mol/l的辛二胺和均苯三甲醛溶液,其中辛二胺和均苯三甲醛的摩尔比为3:2,加入2.5μL的辛酸作为催化剂,静置后得到乳白色凝胶,并分别以质量分数为20%、40%、60%、80%、99.7%的乙醇溶液进行梯度置换溶剂,共置换2d,真空冷冻干燥24h,粉碎,制得粒径为0.02mm的有机多孔材料。
实施例
实施例1:一种PBAT母粒,包括如表1所示用量的原料,其中PBAT的牌号为C1200,润滑剂为芥酸酰胺,抗氧剂为四[β-(3,5-二叔丁基-4-羟基苯基)丙酸]季戊四醇酯(抗氧剂1010),相容剂为乙烯-丙烯酸酯-马来酸酐共聚物,防霉剂为柠檬酸盐,无机微粉为粒径为500目的碳酸钙微粉,吸湿材料包括质量比为0.5:1的高吸水树脂和多孔二氧化硅,有机多孔材料由制备例1制成,高吸水树脂为聚乙烯醇。
上述PBAT母粒的制备方法,包括以下步骤:根据表1中PBAT母粒的原料用量,称取各原料,混合均匀、熔融、挤出、造粒,挤出模头温度为125℃,挤出机的长径比为45:1。
表1实施例1-3中PBAT母粒的原料及用量
原料/kg | 实施例1 | 实施例2 | 实施例3 |
PBAT | 35 | 50 | 20 |
润滑剂 | 1.5 | 3 | 0.5 |
抗氧剂 | 1.5 | 2 | 0.5 |
相容剂 | 2.5 | 3 | 2 |
无机微粉 | 12 | 15 | 5 |
吸湿材料 | 8 | 10 | 5 |
有机多孔材料 | 8 | 10 | 5 |
防霉剂 | 1.2 | 2.2 | 0.6 |
实施例2-3:一种PBAT母粒,与实施例1的区别在于,原料用量如表1所示。
实施例4:一种PBAT母粒,与实施例1的区别在于,吸湿材料全部为高吸水树脂。
实施例5:一种PBAT母粒,与实施例1的区别在于,吸湿材料全部为多孔二氧化硅。
实施例6:一种PBAT母粒,与实施例1的区别在于,多孔二氧化硅经过以下预处理:将2.5kg氧化镁和8kg多孔二氧化硅混合,加入1.5kg氢氧化钠、3kg结晶氯化铝和40kg蒸馏水,升温至110℃下搅拌10h,过滤,烘干。
实施例7:一种PBAT母粒,与实施例6的区别在于,未添加氧化镁。
实施例8:一种PBAT母粒,与实施例6的区别在于,有机多孔材料经过以下预处理:将8kg有机多孔材料至于质量分数为30%的氯化锂溶液中,升温至80℃,搅拌80min,真空抽滤,干燥,研磨,有机多孔材料与氯化锂溶液的质量比为1:15。
实施例9:一种PBAT母粒,与实施例8的区别在于,还含有7kg的除雾剂,防雾剂为全氟烷醇酰胺。
实施例10:一种PBAT母粒,与实施例8的区别在于,还含有7kg的除雾剂,除雾剂由以下方法制成:将丝瓜络纤维在浓度为1g/L的硫酸溶液中酸洗10min洗,蒸馏水洗涤后,进入浓度为2mg/ml的氧化石墨烯分散液后中,抽滤,循环浸渍和抽滤6次,在80℃下真空干燥8h,然后在90℃的氢碘酸溶液中还原浸泡30s,用去离子水和乙醇洗涤,在80℃下干燥。
对比例
对比例1:一种PBAT母粒,与实施例1的区别在于,未添加吸湿材料。
对比例2:一种PBAT母粒,与实施例1的区别在于,未添加有机多孔材料。
应用例
应用例1:一种PBAT保鲜膜,包括以下用量的原料:60kg实施例1制成的PBAT母粒、10kg型号为FY804的PLA、0.3kg抗氧剂1010、0.2kg增塑剂(柠檬酸三丁酯)、0.2kg扩链剂(ADR-4370S)、10kg偶联改性纳米碳酸钙,偶联改性纳米碳酸钙由纳米碳酸钙和偶联剂KH550按照99.5:0.5的质量比,在80℃下捏合30min制成。
上述PBAT保鲜膜的制备方法,包括以下步骤:将PBAT母粒、PLA、抗氧剂1010、增塑剂、扩链剂、偶联改性纳米碳酸钙混合均匀,经过长径比为30:1的螺杆挤出机熔融后挤出、吹塑成膜,制成厚度为10μm的PBAT保鲜膜,挤出温度为170℃。
应用例2:一种PBAT保鲜膜,与应用例1的区别在于,PBAT母粒由实施例2制成。
应用例3-10:一种PBAT保鲜膜,与应用例1的区别在于,PBAT母粒分别由实施例3-10制成。
应用例11-12:一种PBAT保鲜膜,与应用例1的区别在于,PBAT母粒分别由对比例1和对比例2制成。
应用例13:一种生物可降解保鲜膜,制备方法如下(以下各组分均按照重量份计):步骤a、在20℃条件下,将50份木薯淀粉与50份蒸馏水混合并搅拌均匀后,加入4份甘油、0.6份马来酸酐,并不断搅拌形成胶体状的混合物;然后置于水浴锅或油浴锅中进行加热糊化,加热温度为95℃,时间为25min,得到粘稠状胶体;将粘稠状胶体置于烘箱中,烘干温度为100℃,烘烤15min后,将烘干的固体粉碎至200目,得到改性淀粉。
步骤b、分别称取20份改性淀粉、50份PBAT、25份聚乳酸、3份生物降解脂肪族-芳香族共聚酯、5份甲基羟丙基纤维素醚和5份纳米滑石粉(平均粒径为50nm),在75℃下烘干4h,使各组分的含水率≤0.08%;然后将烘干的除纳米滑石粉以外的组分进行搅拌干混至均匀,得到预混合物;接着加入0.2份扩链剂ADR-4368C、0.4份特丁基对苯二酚、0.2份硬酯酸锌和1份抗菌剂,继续搅拌均匀,得到共混物;
该步骤中,生物降解脂肪族-芳香族共聚酯为聚对苯二甲酸-co-己二酸丁二醇酯、聚对苯二甲酸-co-己二酸乙二醇酯和聚对苯二甲酸-co-丁二酸乙二醇酯按照重量比为2:2:1复配的混合物;抗菌剂由乳酸链球菌肽和茶多酚按照重量比3:1复配而成。
步骤c、将共混物由喂料口加入螺杆挤出机,并将烘干的纳米滑石粉在螺杆下游加入螺杆挤出机经高温熔融挤出,然后吹塑成膜后冷却,即得到保鲜膜。该步骤中,螺杆挤出机的喂料转速为1.4rpm,将喂料段的温度控制在60℃,螺杆挤出机各加热区域的温度:一区175℃、二区172℃、三区172℃、四区170℃、五区158℃、六区155℃、射嘴180℃。
应用例14:一种防雾保鲜膜,组分及用量如下:聚乙烯醇2份,大豆分离蛋白12份,聚乙二醇0.3份,戊二醛1.8份,乙酸0.3份,水90份。防雾保鲜膜的制备方法如下:将乙酸溶于水中,然后加入大豆分离蛋白,加热至70℃,搅拌至完全溶解,然后加入聚乙烯醇、聚乙二醇和戊二醛搅拌得到粘稠的溶胶,倒入双螺杆挤出机中,挤出塑炼,吹膜。挤出第1~5区的温度分别为115℃、135℃、155℃、175℃、175℃,机头温度为155℃,转速为20r/min。吹膜工艺中原材料的挤出造粒温度为135℃、155℃、165℃、160℃,转速为20r/min;吹膜温度分别为130℃、150℃、175℃、170℃,转速为35r/min。
性能检测试验
将实施例和对比例中制成的PBAT母粒经过长径比为30:1的螺杆挤出机熔融后挤出、吹塑成膜,制成PBAT保鲜膜,然后按照以下方法检测PBAT保鲜膜的性能,将检测结果记录于表2中。
1、水蒸气透过率:按照GB/T26253-2010《塑料薄膜和薄片水蒸气透过率的测定红外检测器法》进行检测,检测湿度为80%RH;
2、拉伸强度:按照GB/T1040.3-2006《塑料拉伸性能的测定第3部分:薄膜和薄片的试验条件》进行检测;
3、滞水量:将制成的保鲜膜缠盖在具有密封性的冰箱果蔬盒上,用线绳固定,使保鲜膜的膜面绷紧,果蔬盒中放置400g菠菜,在5℃的冰箱中放置30min,观察保鲜膜内表面浸润、结雾、水凝聚、滴水情况,调节测定时间,以保鲜膜内表面不形成水滴为宜,取下线绳,将保鲜膜放置于已经重量(W1)的小烧杯中,称重(记作W1),取出保鲜膜,置于滤纸上吸干保鲜膜表面的水分,放回小烧杯中称重(记作W2),按照下式计算滞水量:滞水量(g)=W1-W2;
4、挑选大小均一,表面色泽鲜亮且相近,物机械损伤、物病虫害侵染的芹菜,装入保鲜膜内,每份500g,封口,每个实施例或对比例做3次平行,常温0-12℃下储存,21天后测量芹菜重量,检测失重率。
表2PBAT保鲜膜的性能测试
结合表2和实施例1-3的内容,实施例1-3中采用高吸水树脂和多孔二氧化硅作为吸湿材料,将果蔬产生的水蒸气吸收到保鲜膜内,减少保鲜膜内的滞水量,减少果蔬失重率,延长保质期。
实施例4和实施例5与实施例1相比,分别使用高吸水树脂和多孔二氧化硅作为吸湿材料,保鲜膜的水蒸气透过率有所下降,而且滞水量增大,失重率上升,保鲜膜内表面的防雾效果减弱,保鲜能力下降。
实施例6与实施例1相比,使用氧化镁等对多孔二氧化硅进行预处理,实施例6制备的保鲜膜的水蒸气透过率增大,而且滞水量减少,防结雾、保鲜效果增强。
实施例7与实施例6相比,预处理多孔二氧化硅时,未添加氧化镁,实施例7中保鲜膜的水蒸气透过率、拉伸强度和滞水量与实施例6相近,但芹菜的失重率增大,说明氧化镁能改善果蔬的防腐能力。
实施例8与实施例6相比,还对有机多孔材料进行预处理,表2内显示,实施例8制备的保鲜膜的水蒸气透过率比实施例6大,
实施例9与实施例8相比,虽然添加了除雾剂,保鲜膜内表面的滞水量减少,但水蒸气透过率、拉伸强度和芹菜的失重率与实施例8相比并没有较大变化,说明使用全氟烷醇酰胺作为除雾剂,仅能降低保鲜膜内表面的水蒸气凝结,防止结雾,并不能增加水蒸气的渗透量,防止水蒸气滴落在果蔬上。
实施例10中使用丝瓜络纤维和氧化石墨烯分散液制备除雾剂,与实施例8相比,保鲜膜的对水蒸气的透过率增大,而且拉伸强度增加,滞水量减小,对果蔬的保鲜能力也有所增强。
对比例1中未添加吸湿材料,对比例2中未添加有机多孔材料,与实施例1相比,对比例1和对比例2制备的保鲜膜透湿性差,滞水量大,保鲜能力减弱。
对比例3中为现有技术制备的可降解保鲜膜,保鲜膜的滞水量大,透湿性差,保鲜能力不及实施例1。
对比例4为一种防雾保鲜膜,其能在内表面形成水膜,不结雾,但其水蒸气透过率大,滞水量大,易滴落在果蔬内,使得保鲜效果减弱。
本具体实施例仅仅是对本申请的解释,其并不是对本申请的限制,本领域技术人员在阅读完本说明书后可以根据需要对本实施例做出没有创造性贡献的修改,但只要在本申请的权利要求范围内都受到专利法的保护。
Claims (8)
1.一种PBAT母粒,其特征在于,包括以下重量份的原料:20-50份PBAT、0.5-2份润滑剂、0.5-2份抗氧剂、2-3份相容剂、5-15份无机微粉、5-10份吸湿材料、5-10份有机多孔材料、0.6-2.2份防霉剂;
所述吸湿材料包括高吸水树脂和多孔二氧化硅,高吸水树脂和多孔二氧化硅的质量比为0.3-0.5:1;
所述有机多孔材料的制备方法如下:以二甲基亚砜为溶剂,配置浓度为 0.15mol/l 的辛二胺和均苯三甲醛溶液,其中辛二胺和均苯三甲醛的摩尔比为 3:2,加入2.5μL 的辛酸作为催化剂,静置后得到乳白色凝胶,并分别以质量分数为 20%、40%、60%、80%、99.7%的乙醇溶液进行梯度置换溶剂,共置换 2d,真空冷冻干燥 24h,粉碎,制得粒径为 0.02mm 的有机多孔材料。
2.根据权利要求1所述的PBAT母粒,其特征在于,所述多孔二氧化硅经过以下预处理:
将氧化镁和多孔二氧化硅混合,加入氢氧化钠、结晶氯化铝和蒸馏水,升温至110-120℃下搅拌8-10h,过滤,烘干。
3.根据权利要求2所述的PBAT母粒,其特征在于,所述多孔二氧化硅预处理时各原料的重量份如下:1.5-3.5份氧化镁、5-10份多孔二氧化硅、1-2份氢氧化钠、2-4份结晶氯化铝和25-50份蒸馏水。
4.根据权利要求1所述的PBAT母粒,其特征在于,所述有机多孔材料经过以下预处理:
将有机多孔材料至于质量分数为25-30%的氯化锂溶液中,升温至60-80℃,搅拌80-90min,真空抽滤,干燥,研磨,有机多孔材料与氯化锂溶液的质量比为1:13-15。
5.根据权利要求1所述的PBAT母粒,其特征在于,所述PBAT母粒中还含有3-7份除雾剂,所述除雾剂由丝瓜络纤维酸洗后循环浸渍氧化石墨烯分散液后干燥、还原、洗涤制成。
6.根据权利要求1所述的PBAT母粒,其特征在于,所述无机微粉选自碳酸钙粉、滑石粉、石英粉、蒙脱石粉、石膏粉中的至少一种。
7.权利要求1-6任一项所述的PBAT母粒的制备方法,其特征在于,包括以下步骤:
根据PBAT母粒的原料用量,称取各原料,混合均匀、熔融、挤出、造粒。
8.一种PBAT保鲜膜,其特征在于,包括以下重量份的原料:40-60份权利要求1-6任一项所述的PBAT母粒、10-20份PLA、0.1-0.5份抗氧剂、0.2-1份增塑剂、0.2-1份扩链剂、10-20份偶联改性纳米碳酸钙。
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