CN110777566A - 一种食品包装纸上的可降解防水防油涂层 - Google Patents
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Abstract
一种食品包装纸上的可降解防水防油涂层由改性壳聚糖、蒙脱土、氟硅有机物构成;所述的改性壳聚糖为羧甲基壳聚糖;所述的蒙脱土与氟硅有机物结合形成疏水表面层;所述的改性壳聚糖、蒙脱土、氟硅有机物的重量比为(5‑10):(5‑10):1;本发明由于不包含淋膜,所以回收再利用过程中不用花费时间、能源处理淋膜,大大提高效益;本发明涂布于底纸上形成的食品包装纸,在环保功能上有着更优越的特点。
Description
技术领域
本发明涉及食品包装领域,具体地说涉及一种涂布在食品包装纸上的可降解防水防油涂层。
背景技术
目前,食品包装是包装工业的大户,占整个包装业的70%左右,而食品包装纸又是食品包装中的重中之重,因此对于食品包装纸的安全性及环保性一直是市场改进及追求的研究方向。
当前大部分食品包装纸仍然采用在纸上淋涂一层很薄的塑料,或采用蜡进行涂布形成防水防油的制品进行使用。高端的也有采用硅油纸进行包装的,硅油纸具有三层构造,第一层底纸,第二层是淋膜,第三层是硅油。总体上,食品包装纸以底纸上淋涂一层塑料膜为主要构造,其中淋膜性质因为无味无毒耐磨耐搓,能在红外线、紫外线、激光或风霜雨雪及酸碱等各种生态或物理化学环境下长期使用,从而成为国际上重点开发利用的基础材料,可是由于其性质的稳定,提高了包装用纸重回收利用的难度,同时也难以在自然界中降解。
对包装纸的回收再利用有利于发展环保事业,但由于当前的回收技术、群众意识、社会关注度等因素,相比发达国家,我国对食品包装纸的回收利用率不高,这就产生一个问题,未回收的食品包装纸残留在自然界中,底纸一般是可降解材料可以自然降解,但是淋膜是难以自然降解的,残留下来的淋膜依然会继续存在,影响环境。
白色污染在当前社会已经是非常严重的问题,因此,解决掉食品包装纸回收利用的两个问题,一是回收后方便处理提高利用率,二是未回收的食品包装纸的自然降解问题,能够更好的保护环境。
发明内容
本发明的目的是解决上述问题,提供一种食品包装纸上的可降解防水防油涂层,从源头上将淋膜替换,涂布在包装纸(透明纸、牛皮纸、白卡纸、铜版纸等等)上后,就能作为食品包装纸使用,这样就能避免食品包装纸在回收再利用环节时出现的处理难的问题,以及未回收的食品包装纸中的淋膜难降解影响环境的问题。
为实现上述目的,本发明采用了如下技术方案:一种食品包装纸上的可降解防水防油涂层,所述的涂层由改性壳聚糖、蒙脱土、氟硅有机物构成;所述的改性壳聚糖为羧甲基壳聚糖;所述的蒙脱土与氟硅有机物结合形成疏水表面层;所述的改性壳聚糖、蒙脱土、氟硅有机物的重量比为(5-10):(5-10):1。
优选的,羧甲基壳聚糖为高脱乙酰度羧甲基壳聚糖,脱乙酰度为96%。
优选的,氟硅有机物包括氟硅烷、聚二甲基硅氧烷、氟硅聚合物等。
一种食品包装纸上的可降解防水防油涂层的制备方法如下:
(1)改性壳聚糖的制备:称取适量的改性壳聚糖,溶于质量分数为2%的乙酸溶液中,形成改性壳聚糖溶液A;
(2)蒙脱土悬浮液的制备:称取适量的蒙脱土,溶于乙酸溶液中,形成蒙脱土悬浮液B;
(3)加热混合:将步骤(2)中制备得到的蒙脱土悬浮液B水浴加热到80℃,用磁力搅拌器将适量氟硅有机物缓慢加入到B中,得溶液C;用磁力搅拌器将步骤(1)制备得到的改性壳聚糖溶液A缓慢加入70℃恒温的溶液C中,继续恒温搅拌2小时;
(4)自然冷却,常温静置12小时后离心分离,水洗、酒精洗涤、真空加热固化即得涂层。
与现有技术相比,本发明的有益效果是:
1.本发明涂布于底纸上即可作为食品包装纸使用,与现有绝大部分的食品包装纸相比,由于不包含淋膜,所以回收再利用过程中不用花费时间、能源处理淋膜,大大提高效益;
2.本发明材料中的壳聚糖为可降解材料,蒙脱土为天然矿物,不影响环境,氟硅有机物无毒副作用环保健康,相比现有绝大部分食品包装纸未回收导致淋膜长期停留在自然界进一步造成白色污染,本发明涂布于底纸上形成的食品包装纸,在环保功能上有着更优越的特点;
3.本发明涂布于底纸上形成的食品包装纸,在阻隔性能上与现有食品包装纸相近,在防水、防油性能上已满足使用要求:壳聚糖、蒙脱土均有亲水性,蒙脱土与氟硅有机物结合形成疏水层面,使涂层在防水性能上满足使用要求。
具体实施方式
下面对本发明的技术方案进行清楚、完整地描述。
实施例1
一种食品包装纸上的可降解防水防油涂层,改性壳聚糖、蒙脱土、氟硅有机物的重量比为5: 5:1。
制备方法如下:
(1)改性壳聚糖的制备:称取5g的改性壳聚糖,溶于质量分数为2%的乙酸溶液中,形成改性壳聚糖溶液A;
(2)蒙脱土悬浮液的制备:称取5g的蒙脱土,溶于乙酸溶液中,形成蒙脱土悬浮液B;
(3)加热混合:将步骤(2)中制备得到的蒙脱土悬浮液B水浴加热到80℃,用磁力搅拌器将1g氟硅烷缓慢加入到B中,得溶液C;用磁力搅拌器将步骤(1)制备得到的改性壳聚糖溶液A缓慢加入70℃恒温的溶液C中,继续恒温搅拌2小时;
(4)自然冷却,常温静置12小时后离心分离,水洗、酒精洗涤、真空加热固化即得涂层。
实施例2
一种食品包装纸上的可降解防水防油涂层,改性壳聚糖、蒙脱土、氟硅有机物的重量比为5: 10:1。
制备方法如下:
(1)改性壳聚糖的制备:称取5g的改性壳聚糖,溶于质量分数为2%的乙酸溶液中,形成改性壳聚糖溶液A;
(2)蒙脱土悬浮液的制备:称取10g的蒙脱土,溶于乙酸溶液中,形成蒙脱土悬浮液B;
(3)加热混合:将步骤(2)中制备得到的蒙脱土悬浮液B水浴加热到80℃,用磁力搅拌器将1g聚二甲基硅氧烷缓慢加入到B中,得溶液C;用磁力搅拌器将步骤(1)制备得到的改性壳聚糖溶液A缓慢加入70℃恒温的溶液C中,继续恒温搅拌2小时;
(4)自然冷却,常温静置12小时后离心分离,水洗、酒精洗涤、真空加热固化即得涂层。
实施例3
一种食品包装纸上的可降解防水防油涂层,改性壳聚糖、蒙脱土、氟硅有机物的重量比为10:5:1。
制备方法如下:
(1)改性壳聚糖的制备:称取10g的改性壳聚糖,溶于质量分数为2%的乙酸溶液中,形成改性壳聚糖溶液A;
(2)蒙脱土悬浮液的制备:称取5g的蒙脱土,溶于乙酸溶液中,形成蒙脱土悬浮液B;
(3)加热混合:将步骤(2)中制备得到的蒙脱土悬浮液B水浴加热到80℃,用磁力搅拌器将1g氟硅聚合物缓慢加入到B中,得溶液C;用磁力搅拌器将步骤(1)制备得到的改性壳聚糖溶液A缓慢加入70℃恒温的溶液C中,继续恒温搅拌2小时;
(4)自然冷却,常温静置12小时后离心分离,水洗、酒精洗涤、真空加热固化即得涂层。
实施例4对本发明实施例的阻隔性能测试。
以市场常见包装纸(金拱门食品包装纸)作为对照组,本产品通过涂布机将实施例产品分别涂布在食品透明纸做为实验组进行测试。
本次阻隔性能测试需进行如下测试:
1.透湿性能测试(防水性能):按照GB-T 1037-1988 塑料薄膜和片材透水蒸气性试验方法杯式法使用透湿性测试仪对对照组和实验组的水蒸气透过率进行测试;
2.耐热油渗透测试(防油性能):根据渗透油面积计算;
3.透氧性能测试(透气性能):按照GB/T 1038-2000 塑料薄膜和薄片气体透过性试验方法(压差法)使用气体渗透仪对对照组和实验组的氧气透过率进行测试。
测试结果如下表所示,以市场常见食品包装纸的数据100%为标准数据,实施例产
品的测试数据为相对数据。
对照组 | 实施例1 | 实施例2 | 实施例3 | |
水蒸气透过率 | 100% | 97% | 99% | 103% |
热油渗透率 | 100% | 94% | 98% | 102% |
氧气透过率 | 100% | 100% | 101% | 100% |
如上表所示,本发明实施例应用于食品透明纸上后,其阻隔性能已与市场上常见的食品包装纸的性能相近。
最后应说明的是:以上所述仅为本发明的优选实施例而已,并不用于限制本发明。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 (4)
1.一种食品包装纸上的可降解防水防油涂层,其特征在于,所述的涂层由改性壳聚糖、蒙脱土、氟硅有机物构成;所述的改性壳聚糖为羧甲基壳聚糖;所述的蒙脱土与氟硅有机物结合形成疏水表面层;所述的改性壳聚糖、蒙脱土、氟硅有机物的重量比为(5-10):(5-10):1。
2.根据权利要求1所述的一种食品包装纸上的可降解防水防油涂层,其特征在于,所述的羧甲基壳聚糖为高脱乙酰度羧甲基壳聚糖,脱乙酰度为96%。
3.根据权利要求1所述的一种食品包装纸上的可降解防水防油涂层,其特征在于,所述的氟硅有机物包括氟硅烷、聚二甲基硅氧烷、氟硅聚合物等。
4.制备如权利要求1-3所述的一种食品包装纸上的可降解防水防油涂层,方法如下:
(1)改性壳聚糖的制备:称取适量的改性壳聚糖,溶于质量分数为2%的乙酸溶液中,形成改性壳聚糖溶液A;
(2)蒙脱土悬浮液的制备:称取适量的蒙脱土,溶于乙酸溶液中,形成蒙脱土悬浮液B;
(3)加热混合:将步骤(2)中制备得到的蒙脱土悬浮液B水浴加热到80℃,用磁力搅拌器将适量氟硅有机物缓慢加入到B中,得溶液C;用磁力搅拌器将步骤(1)制备得到的改性壳聚糖溶液A缓慢加入70℃恒温的溶液C中,继续恒温搅拌2小时;
(4)自然冷却,常温静置12小时后离心分离,水洗、酒精洗涤、真空加热固化即得涂层。
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