CN113201963A - 一种牛皮纸专用的热封乳液及其制备方法 - Google Patents
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Abstract
本发明提供了一种牛皮纸专用的热封乳液及其制备方法,热封乳液以质量分数计,包括以下组分:软水65~78%,乙烯‑丙烯酸共聚物颗粒18~25%,分散剂3~8%,交联剂0.3~1.0%,蜡乳液0.1~0.5%,消泡剂0.3~0.8%和pH调节剂0.1~0.5%;所述交联剂选自聚乙烯亚胺、氨基树脂和氮丙啶中的一种或多种。本发明通过采用特定种类的交联剂将EAA颗粒中的羧基基团进行交联反应,通过交联分子链和牛皮纸张表面的纤维进行化学键合,形成致密的网状分子结构,提高乳液和牛皮纸具有较高的附着力,在一定温度下涂层还具有较好的热封强度。还具有优异的阻隔水蒸气透过率。
Description
技术领域
本发明属于高分子技术领域,尤其涉及一种牛皮纸专用的热封乳液及其制备方法。
背景技术
塑料薄膜因其具有韧性好、防潮性好、携带方便等特点而大量用于食品包装,但塑料薄膜不可降解,近几年废弃的塑料薄膜形成的白色污染问题已经越来越严重。牛皮纸由于其可回收、具有一定的厚度和强度,可适用于如腊肠、花生、瓜子等食品的包装,但牛皮纸防水性、热封性能较差,使其在包装花生、瓜子等需要具有良好的防潮性、热封性的食品包装方面的应用受到局限。
为了使牛皮纸类包装材料具有一定的防和热封性能,通常是将热熔聚乙烯(PE)塑料粒子均匀地喷淋在牛皮纸表面上,从而形成淋膜牛皮纸,相比起普通的牛皮纸,淋膜牛皮纸具有防水、高热封等特点,如中国专利CN111270557A涉及的一种淋膜牛皮纸生产工艺。但是当牛皮纸经过淋膜后,制成的食品包装袋子使用后的废弃物,若想回收分离PE层后再制浆,难度非常大。若任由自然分解,需要很长的时间,给环境造成了很大污染,同时也浪费了纸资源。
为了解决淋膜纸回收难问题,国内外已经开始研究通过功能涂层来提高牛皮纸的防水和热封性能。如中国专利CN103059195A涉及的一种用于食品包装的牛皮纸专用PVDC胶乳及其制法和应用,其方法为在牛皮纸上涂布PVDC涂层来提供防水和热封性能。但是PVDC由于环保问题,目前欧美等发达国家已经逐步禁止使用PVDC涂层。若通过其它技术提高牛皮纸的防水和热封性能,将进一步拓宽牛皮纸在食品包装领域的应用。
发明内容
有鉴于此,本发明的目的在于提供一种牛皮纸专用的热封乳液及其制备方法,该热封乳液与牛皮纸具有较高的附着力和较好的热封强度。
本发明提供了一种牛皮纸专用的热封乳液,以质量分数计,包括以下组分:
软水65~78%,乙烯-丙烯酸共聚物颗粒18~25%,分散剂3~8%,交联剂0.3~1.0%,蜡乳液0.1~0.5%,消泡剂0.3~0.8%和pH调节剂0.1~0.5%;
所述交联剂选自聚乙烯亚胺、氨基树脂和氮丙啶中的一种或多种。
在本发明中,所述分散剂选自聚丙烯酸钠和/或六偏磷酸钠。
在本发明中,所述乙烯-丙烯酸共聚物颗粒的熔点为60~75℃。
在本发明中,所述乙烯-丙烯酸共聚物颗粒的粒度为20~50目。
在本发明中,所述蜡乳液选自棕榈蜡和/或聚乙烯蜡。
所述消泡剂选自有机硅消泡剂;
所述pH调节剂选自氢氧化钠和/或氢氧化钾。
本发明提供了一种上述技术方案所述牛皮纸专用的热封乳液的制备方法,包括以下步骤:
将部分软水和交联剂混合,得到交联剂溶液;
将剩余部分软水和乙烯-丙烯酸共聚物颗粒、分散剂混合,抽真空,降压至-(0.06~0.08)MPa,搅拌条件下,升温至100~110℃保持1~2h,使EAA颗粒溶解,得到EAA溶液;
将所述交联剂溶液滴加至EAA溶液中,在80~90℃下交联反应,反应结束后继续保温1~2h,加入蜡乳液、pH调节剂和消泡剂,充分搅拌,静置冷却至室温,得到牛皮纸专用的热封乳液。
本发明在溶解EAA颗粒加热前,由于先将反应进行抽真空,使高温溶解时,反应产生的压力在安全范围内,保证设备人员的安全。本发明采用EAA聚合物颗粒的熔点为60~75℃,在75℃时牛皮纸上的涂层就有较强的热封强度,有效提高终端包装机的生产效率,避免因封口时烙铁温度过高造成包装内物的变质。
本发明通过采用特定种类的交联剂将EAA颗粒中的羧基基团进行交联反应,通过交联分子链和牛皮纸张表面的纤维进行化学键合,形成致密的网状分子结构,提高乳液和牛皮纸的附着力,在一定温度下涂层还具有较好的热封强度。EAA颗粒分散成乳液状态后,通过蜡乳液调节乳液的表面张力,乳液涂在牛皮纸上烘干后形成超强的疏水涂层,形成荷叶效应状态,阻隔水蒸气的透过率。实验结果表明:涂布本发明的热封乳液后牛皮纸的水蒸汽透过率为2~5g/m2.day;70℃下热封强度为1.8~2.4N/15mm;75℃下热封强度为2.5~2.8N/15mm;85℃下热封强度为3.2~3.5N/15mm;90℃下热封强度为3.8~4.0N/15mm。
附图说明
图1为本发明实施例1制备的热封牛皮纸效果图。
具体实施方式
本发明,下面结合实施例对本发明提供的一种牛皮纸专用的热封乳液及其制备方法进行详细地描述,但不能将它们理解为对本发明保护范围的限定。
实施例1
1、配方:
2、制备:
(1)将15wt%的软水和1.0wt%的交联剂加入到配料罐中,在室温下搅拌1小时,搅拌速度为100转/min,得到交联剂溶液待用;
(2)在反应釜中先加入剩余的软水,再加入25wt%的EAA颗粒料,8wt%的分散剂,关闭反应釜的各个进出口阀门,开启真空泵对反应釜内进行抽真空,将釜内压力降到-0.06MPa,开启搅拌,转速为400转/分,升温到110℃保持1小时,使EAA母料完全溶解;
(3)通过计量泵将配制好的交联剂溶液滴加到反应釜中,滴加时间控制为3小时,并控制好交联反应温度为85℃;
(4)待交联剂溶液滴加完成后,继续85℃下保温1小时,然后降温到65℃,加入0.4wt%的聚乙烯蜡乳液,0.1wt%的pH调节剂,0.5wt%的有机硅消泡剂,充分搅拌0.5小时,静置待冷却到室温后,得到牛皮纸专用热封乳液。
图1为本发明实施例1制备的热封牛皮纸外观图。
将本发明实施例1制得的热封乳液涂布在150g/m2的牛皮纸上,涂层干涂布量为3g/m2,经热风烘干后,将制成的涂布牛皮纸检测,结果见下表:
表1实施例1制备的牛皮纸专用乳液的性能测试结果
备注:水蒸汽透过率的检测方法为GB/T1037,热封强度检测方法为GB/T2358-98。
实施例2
1、配方:
2、制备:
(1)将15wt%的软水和0.8wt%的交联剂加入到配料罐中,在室温下搅拌0.5小时,搅拌速度为150转/min,得到交联剂溶液待用;
(2)在反应釜中先加入剩余的软水,再加入19%wt的EAA颗粒料,10wt%的分散剂,关闭反应釜的各个进出口阀门,开启真空泵对反应釜内进行抽真空,将釜内压力降到-0.08MPa,开启搅拌,转速为500转/分,升温到100℃保持2小时,使EAA母料完全溶解;
(3)通过计量泵将配制好的交联剂溶液滴加到反应釜中,滴加时间控制为4小时,并控制好交联反应温度为90℃;
(4)待交联剂溶液滴加完成后,继续90℃下保温2小时,然后降温到50℃,加入0.1wt%的棕榈蜡乳液,0.3wt%的pH调节剂,0.8wt%的有机硅消泡剂,充分搅拌1小时,静置待冷却到室温后,得到牛皮纸专用热封乳液。
将本发明实施例2制得的热封乳液涂布在80g/m2的牛皮纸上,涂层干涂布量为4g/m2,经热风烘干后,将制成的涂布牛皮纸进行检测,结果见下表:
表2实施例2制备的牛皮纸专用乳液的性能测试结果
实施例3
1、配方:
2、制备:
(1)将15wt%的软水和0.7wt%的交联剂加入到配料罐中,在室温下搅拌0.7小时,搅拌速度为130转/min,得到交联剂溶液待用;
(2)在反应釜中先加入剩余的软水,再加入17wt%的EAA颗粒料,3wt%的分散剂,关闭反应釜的各个进出口阀门,开启真空泵对反应釜内进行抽真空,将釜内压力降到-0.07MPa,开启搅拌,转速为300转/分,升温到105℃保持1.5小时,使EAA母料完全溶解;
(3)通过计量泵将配制好的交联剂溶液滴加到反应釜中,滴加时间控制为5小时,并控制好交联反应温度为80℃;
(4)待交联剂溶液滴加完成后,继续80℃下保温1.5小时,然后降温到55℃,加入0.5wt%的聚乙烯蜡乳液,0.5wt%的pH调节剂,0.3wt%的有机硅消泡剂,充分搅拌0.7小时,静置待冷却到室温后,得到牛皮纸专用热封乳液。
将本发明实施例3制得的热封乳液涂布在100g/m2的牛皮纸上,涂层干涂布量为5g/m2,经热风烘干后,将制成的涂布牛皮纸进行检测,结果见下表:
表3实施例3制备的牛皮纸专用乳液的性能测试结果
对比例1:
2、配方:
2、制备:
(1)将15wt%的软水和1.0wt%的交联剂加入到配料罐中,在室温下搅拌1小时,搅拌速度为100转/min,得到交联剂溶液待用;
(2)在反应釜中先加入剩余的软水,再加入25wt%的EAA颗粒料,8wt%的分散剂,关闭反应釜的各个进出口阀门,开启真空泵对反应釜内进行抽真空,将釜内压力降到-0.06MPa,开启搅拌,转速为400转/分,升温到110℃保持1小时,使EAA母料完全溶解;
(3)通过计量泵将配制好的交联剂溶液滴加到反应釜中,滴加时间控制为3小时,并控制好交联反应温度为85℃;
(4)待交联剂溶液滴加完成后,继续85℃下保温1小时,然后降温到65℃,加入0.4wt%的石蜡乳液,0.1wt%的pH调节剂,0.5wt%的有机硅消泡剂,充分搅拌0.5小时,静置待冷却到室温后,得到牛皮纸专用热封乳液。
将对比例1制得的热封乳液涂布在150g/m2的牛皮纸上,涂层干涂布量为3g/m2,经热风烘干后,将制成的涂布牛皮纸进行检测,结果见下表:
表4对比例1制备的牛皮纸专用热封乳液的性能测试结果
对比例2:
选用专利CN103059195A实施例2的PVDC乳液,涂布在130g/m2的牛皮纸上,涂层干涂布量为4g/m2,经热风烘干后,将制成的涂布牛皮纸进行检测,结果见下表:
表5对比例2制备的牛皮纸专用乳液的性能测试结果
由以上实施例可知,本发明通过采用特定种类的交联剂将EAA颗粒中的羧基基团进行交联反应,通过交联分子链和牛皮纸张表面的纤维进行化学键合,形成致密的网状分子结构,提高乳液和牛皮纸的附着力,在一定温度下涂层还具有较好的热封强度。EAA颗粒分散成乳液状态后,通过蜡乳液调节乳液的表面张力,乳液涂在牛皮纸上烘干后形成超强的疏水涂层,形成荷叶效应状态,阻隔水蒸气的透过率。实验结果表明:涂布本发明的热封乳液后牛皮纸的水蒸汽透过率为2~5g/m2.day;70℃下热封强度为1.8~2.4N/15mm;75℃下热封强度为2.5~2.8N/15mm;85℃下热封强度为3.2~3.5N/15mm;90℃下热封强度为3.8~4.0N/15mm。
以上所述仅是本发明的优选实施方式,应当指出,对于本技术领域的普通技术人员来说,在不脱离本发明原理的前提下,还可以做出若干改进和润饰,这些改进和润饰也应视为本发明的保护范围。
Claims (7)
1.一种牛皮纸专用的热封乳液,以质量分数计,包括以下组分:
软水65~78%,乙烯-丙烯酸共聚物颗粒18~25%,分散剂3~8%,交联剂0.3~1.0%,蜡乳液0.1~0.5%,消泡剂0.3~0.8%和pH调节剂0.1~0.5%;
所述交联剂选自聚乙烯亚胺、氨基树脂和氮丙啶中的一种或多种。
2.根据权利要求1所述的热封乳液,其特征在于,所述分散剂选自聚丙烯酸钠和/或六偏磷酸钠。
3.根据权利要求1所述的热封乳液,其特征在于,所述乙烯-丙烯酸共聚物颗粒的熔点为60~75℃。
4.根据权利要求1所述的热封乳液,其特征在于,所述乙烯-丙烯酸共聚物颗粒的粒度为20~50目。
5.根据权利要求1所述的热封乳液,其特征在于,所述蜡乳液选自棕榈蜡和/或聚乙烯蜡。
6.根据权利要求1所述的热封乳液,其特征在于,所述消泡剂选自有机硅消泡剂;
所述pH调节剂选自氢氧化钠和/或氢氧化钾。
7.一种权利要求1~5任一项所述牛皮纸专用的热封乳液的制备方法,包括以下步骤:
将部分软水和交联剂混合,得到交联剂溶液;
将剩余部分软水和乙烯-丙烯酸共聚物颗粒、分散剂混合,抽真空,降压至-(0.06~0.08)MPa,搅拌条件下,升温至100~110℃保持1~2h,使EAA颗粒溶解,得到EAA溶液;
将所述交联剂溶液滴加至EAA溶液中,在80~90℃下交联反应,反应结束后继续保温1~2h,加入蜡乳液、pH调节剂和消泡剂,充分搅拌,静置冷却至室温,得到牛皮纸专用的热封乳液。
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