CN113105724B - 一种可降解塑料包装袋的制备方法及其应用 - Google Patents
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Abstract
本发明属于包装领域,公开了一种可降解塑料包装袋的制备方法及其应用,所述的可降解塑料包装袋的制备方法包括:将塑料母料溶于特定共混试剂中,80℃~200℃下搅拌得溶液A。将交联剂溶于去离子水,60~150℃下搅拌得溶液B。将化学发泡剂溶于去离子水,30~90℃下搅拌得溶液C。待A/B/C均冷却至室温后,从A或C溶液中析出母料胶体,并将胶体置于牛皮纸上上60~300℃发泡,封装后即可得本发明可降解塑料包装袋。本发明制备的包装袋可自然生物降解,低生物毒性,对环境友好;操作简单,成本低廉;本发明制备的包装袋减震效果良好,可应用于快递包装领域。
Description
技术领域
本发明属于包装领域,更具体地,涉及一种可降解塑料包装袋的制备方法和应用。
背景技术
2020年,国家出台《关于进一步加强塑料污染治理的意见》等多个文件,宣布国内禁塑令的正式实施,政策要求国内不可降解塑料袋需逐步淘汰,一次性塑料餐具消耗强度下降30%,2025年基本完成塑料污染初步治理,随着各省市对禁塑令政策的宣传推进,可降解塑料成为热门研究课题。
可降解塑料由于其具有塑料的高稳定性、高韧性和可塑性等传统性能,同时在环境中可通过光、热、水、氧化、生物等方式自然降解,对环境影响小,成为新型包装材料的热门研究方向,目前,应用广泛的可降解塑料如PLA、PBS、PBAT、PCL等塑料母料制备工艺难度较大,单独吹塑或压塑制成包装袋成本较高,并不能良好适应现有市场规则。
鉴于此,将可降解塑料应用到发泡材料领域成为一个解决方案,自21世纪以来,国内外对于发泡材料的报导屡见不鲜,其中,对于可降解塑料的发泡行为研究,多数科研工作者采用的是物理发泡,如CO2超临界状态物理发泡;以及添加各种助剂,如增塑剂、扩链剂用于稳定泡孔,增强力学性能,但如此处理可降解塑料往往导致其可降解性能下降,且对于设备要求较高,实际工业生产仍存在成本高,操作困难的问题。
发明内容
为了解决上述现有技术中存在的不足之处,本发明首要目的在于提供一种可降解塑料包装袋,该包装袋生物相容性好,减震效果良好。
本发明的另一目的在于提供上述可降解塑料包装袋的制备方法,该方法通过化学发泡法快速简便地制备出了可降解塑料包装袋。
本发明的再一目的在于提供上述可降解塑料包装袋的应用。
本发明的目的通过下述技术方案来实现:
一种可降解塑料包装袋的制备方法,其特征在于,包括以下步骤:
步骤S1、将可降解塑料母料溶于N,N-二甲基乙酰胺(DMAC)与四氢呋喃(THF)的共混溶液,溶解条件为80℃~200℃,并伴随持续搅拌,反应后得溶液A;聚乙烯醇(PVA)溶于去离子水中,溶解条件为60℃~150℃,伴随机械搅拌,反应后得溶液B;将碳酸氢铵溶于去离子水中,溶解条件为30~90℃,持续搅拌,反应后得溶液C;
步骤S2、待A/B/C三种溶液均制备完成并冷却至室温后,将溶液B和溶液C共混搅拌均匀得溶液D,取溶液A滴加入D中,搅拌10~60s后溶液中析出白色胶体,用镊子取出,不断重复上述过程,直至溶液A消耗完毕;
步骤S3、将所得白色胶体均匀置于牛皮纸上,并再附上一层牛皮纸贴合,在60~300℃温度下发泡,发泡完成后胶体将粘附于两张牛皮纸中,最终所得即为可降解塑料包装袋。
优选地,本发明中的可降解塑料母料与N,N-二甲基乙酰胺(DMAC)、四氢呋喃(THF)的共混溶液中,其三者质量比分别为1:1~5:2~10。
优选地,本发明中的的可降解塑料母料包括但不限于对苯二甲酸-己二酸丁二醇酯共聚物(PBAT),聚己内酯(PCL),聚乳酸(PLA),聚丁二酸丁二醇酯(PBS)。
优选地,本发明中的步骤S1、S2所述搅拌的速率均为200~500r/min。
优选地,本发明中的制备溶液A的反应时间为30min~4h,溶液B的反应时间为1h~5h,溶液C的反应时间为5min~60min。
优选地,本发明中的步骤S2所述的溶液B与溶液C的混合溶液质量比为1:10~50。
优选地,本发明中的步骤S2所述的取溶液A滴加入D中的溶液A用量为0.5g~100g。
优选地,本发明中的步骤S3所述的白色胶体均匀置于牛皮纸上时,相邻两白色胶体之间间隔为0~10cm。
优选地,本发明中的步骤S3所述的发泡时间为2~10min。
优选地,本发明中的一种可降解塑料包装袋的制备方法制备得到可降解塑料包装袋在快递运输或食品包装领域中的应用。
与现有技术相比,本发明具有以下有益效果:
1. 本发明制备的包装袋可自然生物降解,低生物毒性,对环境友好。
2. 本发明制备的包装袋不需借助精密仪器,操作简单,成本低廉。
本发明制备的包装袋减震效果良好,可应用于快递包装领域。
附图说明
图1为实施例1所得的可降解塑料包装袋拉力测试图。
图2为实施例2所得的可降解塑料包装袋拉力测试图。
图3为实施例3所得的可降解塑料包装袋拉力测试图。
具体实施方式
下面结合具体实施例进一步说明本发明的内容,但不应理解为对本发明的限制。若未特别指明,实施例中所用的技术手段为本领域技术人员所熟知的常规手段。除非特别说明,本发明采用的试剂、方法和设备为本技术领域常规试剂、方法和设备。
实施例1
1.将PBAT5g溶于5gDMAC与20gTHF的共混溶液中,溶解条件为140℃,并伴随持续搅拌,反应2h后得溶液A,将PVA溶于去离子水中,溶解条件为100℃,伴随机械搅拌,反应12h后得溶液B,将20g碳酸氢铵溶于100g去离子水中,溶解条件为30℃,持续搅拌,反应20min后得溶液C。
2.待A/B/C三种溶液均制备完成冷却至室温后,将溶液B10g和溶液C150g共混搅拌均匀得溶液D,取溶液A1g滴加入D中,搅拌20s后溶液D中析出白色胶体,用镊子取出,不断重复上述过程,直至溶液A消耗完毕。
3.将所得白色胶体均匀置于牛皮纸上,并再附上一层牛皮纸贴合,在120℃温度下发泡,发泡完成后胶体将粘附于两张牛皮纸中,最终所得即为可降解塑料包装袋,经拉力检测,两张牛皮纸之间的粘结力为0.87N。
实施例2
1.将PCL5g溶于5gDMAC与20gTHF的共混溶液中,溶解条件为70℃,并伴随持续搅拌,反应2h后得溶液A,将PVA溶于去离子水中,溶解条件为100℃,伴随机械搅拌,反应12h后得溶液B,将20g碳酸氢纳溶于100g去离子水中,溶解条件为30℃,持续搅拌,反应20min后得溶液C。
2.待A/B/C三种溶液均制备完成冷却至室温后,将溶液B10g和溶液C150g共混搅拌均匀得溶液D,取溶液A1g滴加入D中,搅拌20s后溶液D中析出白色胶体,用镊子取出,不断重复上述过程,直至溶液A消耗完毕。
3.将所得白色胶体均匀置于牛皮纸上,并再附上一层牛皮纸贴合,在120℃温度下发泡,发泡完成后胶体将粘附于两张牛皮纸中,最终所得即为可降解塑料包装袋,经拉力检测,两张牛皮纸之间的粘结力为9.02N。
实施例3
1.将PBAT5g溶于5gDMAC与20gTHF的共混溶液中,溶解条件为140℃,并伴随持续搅拌,反应2h后得溶液A,将PVA溶于去离子水中,溶解条件为100℃,伴随机械搅拌,反应12h后得溶液B,将20g碳酸氢铵溶于100g去离子水中,溶解条件为30℃,持续搅拌,反应20min后得溶液C。
2.待A/B/C三种溶液均制备完成冷却至室温后,将溶液B10g和溶液C150g共混搅拌均匀得溶液D,取溶液D1g滴加入A中,搅拌20s后溶液A中析出白色胶体,用镊子取出,不断重复上述过程,直至溶液A消耗完毕。
3.将所得白色胶体均匀置于牛皮纸上,并再附上一层牛皮纸贴合,在120℃温度下发泡,发泡完成后胶体将粘附于两张牛皮纸中,最终所得即为可降解塑料包装袋,经拉力检测,两张牛皮纸之间的粘结力为22.8N。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其他的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合和简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (8)
1.一种可降解塑料包装袋的制备方法,其特征在于,包括以下步骤:
步骤S1、将可降解塑料母料溶于N,N-二甲基乙酰胺(DMAC)与四氢呋喃(THF)的共混溶液,溶解条件为80℃~200℃,并伴随持续搅拌,反应后得溶液A;聚乙烯醇(PVA)溶于去离子水中,溶解条件为60℃~150℃,伴随机械搅拌,反应后得溶液B;将碳酸氢铵溶于去离子水中,溶解条件为30~90℃,持续搅拌,反应后得溶液C,其中,所述的可降解塑料母料包括对苯二甲酸-己二酸丁二醇酯共聚物(PBAT)、聚己内酯(PCL)、聚乳酸(PLA)、聚丁二酸丁二醇酯(PBS);
步骤S2、待A/B/C三种溶液均制备完成并冷却至室温后,将溶液B和溶液C共混搅拌均匀得溶液D,取溶液A滴加入D中,搅拌10~60s后溶液中析出白色胶体,用镊子取出,不断重复上述过程,直至溶液A消耗完毕;
步骤S3、将所得白色胶体均匀置于牛皮纸上,并再附上一层牛皮纸贴合,在60~120℃温度下发泡,发泡完成后胶体将粘附于两张牛皮纸中,最终所得即为可降解塑料包装袋。
2.根据权利要求1所述的一种可降解塑料包装袋的制备方法,其特征在于,所述的可降解塑料母料与N,N-二甲基乙酰胺(DMAC)、四氢呋喃(THF)的共混溶液中,其三者质量比分别为1:1~5:2~10。
3.根据权利要求1所述的一种可降解塑料包装袋的制备方法,其特征在于,步骤S1、S2所述搅拌的速率均为200~500r/min。
4.根据权利要求1所述的一种可降解塑料包装袋的制备方法,其特征在于,所述制备溶液A的反应时间为30min~4h,溶液B的反应时间为1h~5h,溶液C的反应时间为5min~60min。
5.根据权利要求1所述的一种可降解塑料包装袋的制备方法,其特征在于,步骤S2所述的溶液B与溶液C的混合溶液质量比为1:10~50。
6.根据权利要求1所述的一种可降解塑料包装袋的制备方法,其特征在于,步骤S2所述的取溶液A滴加入D中的溶液A用量为0.5g~100g。
7.根据权利要求1所述的一种可降解塑料包装袋的制备方法,其特征在于,步骤S3所述的白色胶体均匀置于牛皮纸上时,相邻两白色胶体之间间隔为0~10cm。
8.根据权利要求1所述的一种可降解塑料包装袋的制备方法,其特征在于,步骤S3所述的发泡时间为2~10min。
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