CN116200967A - 一种包装用可热封特种纸的制备方法 - Google Patents
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Abstract
本发明涉及特种纸的制备领域，提供一种包装用可热封特种纸的制备方法，解决现有技术的包装原纸由于制备工艺和材料配方的缺陷导致产品易吸水、强度不高及不能热封的缺陷。包括以下制备步骤：(1)原材料的配制：针叶浆50－70重量份、阔叶浆30－50重量份、阴离子聚丙烯酰胺0.3－1重量份、聚乙烯亚胺0.5－3重量份、5－15重量份改性聚氨酯；(2)将针叶浆打浆至38－42°SR，将所述阔叶浆打浆至40－45°SR，再将针叶浆料与阔叶浆料混合，调节pH，搅拌均匀，得到纸基浆料；(3)将步骤(1)的所述改性聚氨酯加入所述纸基浆料中，分散均匀后再加入所述阴离子聚丙烯酰胺及所述聚乙烯亚胺，混合均匀后进行抄纸；(4)干燥。
Description
技术领域
本发明涉及特种纸的制备领域，尤其涉及一种包装用可热封特种纸的制备方法。
背景技术
纸张的主要成分是植物纤维，其原料主要来源自然界，可回收降解使用，即使废弃后其废弃物回归大自然，具备天然的生物降解特性，预计纸基材料将成为行业新宠。
但是，传统的纸张与塑料相比，具有非常鲜明的“缺点”。首先，纸纤维本身不具备热封性，一般采用淋覆聚乙烯等塑料材料以获得良好的热封性(例如传统的列车清洁袋、飞机清洁袋、瓜子真空袋等)，但淋覆塑料材料后的复合纸因含有塑料材料而不被新法规接受，同时也不符合降解标准。其次，纸张材料中有大量的亲水基团，容易吸收水分，在吸收水分后强度下降，使其失去保护功能。第三，纸张的韧性和强度低于相近定量的聚乙烯、聚丙烯等材料，无法符合自动包装的要求。
中国专利申请号202010013643.5公开了一种可生物完全降解热封纸及其制备方法与应用，包括如下步骤：(1)将植物纤维原料置于碎浆机进行碎解：浆浓控制在质量浓度为3～8％，碎解时间为5～40min，得到浆料；(2)将步骤(1)得到的浆料经过盘磨打浆机打浆，得到打浆度为25～75°SR的纸浆；(3)向步骤(2)得到的纸浆中依次加入施胶剂、湿强剂、防水剂、防油剂，混合，搅拌时间为10～40min，得到混合的纸浆；(4)将聚乳酸纤维置于碎浆机中进行疏解分散，浆浓控制在质量浓度为0.5％～5％，搅拌时间为5～40min；(5)将步骤(3)得到混合的纸浆与步骤(4)得到疏散分解的聚乳酸纤维混合，在网前箱添加助留剂，在造纸机上进行抄造，得到可生物完全降解热封纸。
该专利通过添加聚乳酸纤维使得热封纸具有生物完全降解性，但获得的纸张中依然含有大量的亲水基团，容易吸收水分，纸张的强度不高。
发明内容
因此，针对上述的问题，本发明提供一种包装用可热封特种纸的制备方法，解决现有技术的包装原纸由于制备工艺和材料配方的缺陷导致产品易吸水、强度不高及不能热封的缺陷。
为实现上述目的，本发明采用了以下技术方案：一种包装用可热封特种纸的制备方法，包括以下制备步骤：
(1)原材料的配制：针叶浆50－70重量份、阔叶浆30－50重量份、阴离子聚丙烯酰胺0.3－1重量份、聚乙烯亚胺0.5－3重量份、5－15重量份改性聚氨酯；
(2)将针叶浆打浆至38－42°SR，将所述阔叶浆打浆至40－45°SR，再将针叶浆料与阔叶浆料混合，调节pH，搅拌均匀，得到纸基浆料；
(3)将步骤(1)的所述改性聚氨酯加入所述纸基浆料中，分散均匀后再加入所述阴离子聚丙烯酰胺及所述聚乙烯亚胺，混合均匀后进行抄纸；
(4)干燥。
进一步的改进是：所述改性聚氨酯以聚甲基乙撑碳酸酯和丙烯酸树脂改性聚氨酯而得。
进一步的改进是：所述聚氨酯为线性结构。
进一步的改进是：所述聚甲基乙撑碳酸酯、丙烯酸树脂、聚氨酯的用量比以重量份计＝1.5－2.3：2.4－3.6：5.4－5.8。
进一步的改进是：所述改性聚氨酯以聚甲基乙撑碳酸酯、丙烯酸树脂、环氧树脂改性聚氨酯而得。
进一步的改进是：聚甲基乙撑碳酸酯、丙烯酸树脂、环氧树脂、聚氨酯的用量比以重量份计为1.5－2.3：2.4－3.6：1－1.3：4.2－4.5。
进一步的改进是：还包括0.2－0.4重量份的增粘树脂。
进一步的改进是：所述增粘树脂为歧化松香。
通过采用前述技术方案，本发明的有益效果为：
1、纸纤维中含有醚键、酯键、酰胺键等极性键，以及羟基、羧基等基团，易与聚氨酯中的－NCO基团作用形成牢固的氨酯键和脲键，能够改性纸纤维易吸水的特性，但单纯的聚氨酯软化点较高，且热封固化时间长，本发明以聚甲基乙撑碳酸酯及丙烯酸树脂进行改性，软化温度下降、固化时间缩短以及熔融后粘度适中，且能够保持纸张的硬挺度。
2、本发明以聚甲基乙撑碳酸酯改性聚氨酯，聚甲基乙撑碳酸酯在自然环境下能够被微生物快速降解为水和二氧化碳，较为环保。
3、本发明选用丙烯酸树脂和聚甲基乙撑碳酸酯结合改性聚氨酯，既能克服单用丙烯酸树脂后导致硬度下降、粘度太大，又能克服单用聚甲基乙撑碳酸酯导致聚氨酯胶层断裂的缺陷。
4、本发明通过选用纤维强度高的优质木浆，通过针叶浆与阔叶浆合理配置，使纸张纤维成分的排列和分布达到优秀的力学结构。本专利添加少量的阴离子聚丙烯酰胺，其在纤维表面形成氢键，增强了内部纤维的结合力，同时使纤维的分布更加均匀，聚乙烯亚胺的加入，与纤维素的部分基团形成了离子桥屏障，纸张在高湿状态下不易浸润、不易润胀，具有较强的抗湿作用。
5、一般地，为了解决纸张纤维表面粗糙的特点，在生产用于印刷的纸张时，会在纸张配方中加入填料。加入细小颗粒的填料后，可以填补纤维交织网络形成的大量孔隙和表面的不平整，提高纸张的柔软性、可塑性。但是填料的加入减少了纤维间的结合，使纸张强度下降，例如抗张强度、耐折度和耐破度都大幅下降。本专利产品要求在保证优秀的表面光洁度、印刷适性的同时，确保纸张具备优秀的力学性能，因此不添加填料。为解决上述问题，本专利采用改性后的聚氨酯，其分子结构中大量的羧基与纸张纤维结构中的羟基反应，生成酯类物质。失去游离的羟基后，纸张纤维不具备大量吸收水分的基础条件，使得纸张的耐水性能大幅度提升。同时，反应后的改性聚氨酯滞留在纤维之间，填补了纤维之间的空隙。使得纸张不需要添加填料，却能获得极佳的表面光洁度、印刷适性和耐水性能。此外，在后续纸张使用过程中，通过对纸张加热到130℃－180℃，施加0.15－0.45MPa压力，保留0.5－1s时间，即可使反应后的聚氨酯重新软化，并使两片或多片本配方纸张之间产生良好的内聚力进行封合。即，本采用本配方生产的纸张具有良好的热封性能，可广泛应用于各种场景下的热封包装，且同时适用于批量化包装方式。
6、本发明产品挺度好，表面平整、手感挺括、质感好。产品机械性能优异，适合自动化包装。产品表面光洁度高，适用于胶印、柔印和凹印等各种印刷方式。
7、本发明产品的拉伸强度(TD/MD)可以做到25MPa以上。产品的的抗张强度、耐折度和耐破度高于同克重纸张30％以上，可在低克重条件下使用。产品不易吸湿溶胀，湿水强度(抗张强度、耐破度)极佳。
8、本发明产品采用天然植物纤维，可自然降解，对环境友好。
具体实施方式
实施例一
一种包装用可热封特种纸的制备方法，包括以下制备步骤：
(1)原材料的配制：针叶浆50重量份、阔叶浆30重量份、阴离子聚丙烯酰胺0.3重量份、聚乙烯亚胺0.5重量份、5重量份改性聚氨酯；
(2)将针叶浆打浆至38°SR，将所述阔叶浆打浆至40°SR，再将针叶浆料与阔叶浆料混合，调节pH，搅拌均匀，得到纸基浆料；
(3)将步骤(1)的所述改性聚氨酯加入所述纸基浆料中，分散均匀后再加入所述阴离子聚丙烯酰胺及所述聚乙烯亚胺，混合均匀后进行抄纸；
(4)干燥。
所述改性聚氨酯以聚甲基乙撑碳酸酯和丙烯酸树脂改性聚氨酯而得，所述聚氨酯为线性结构，所述聚甲基乙撑碳酸酯、丙烯酸树脂、聚氨酯的用量比以重量份计＝1.5：2.4：5.4。
实施例二
一种包装用可热封特种纸的制备方法，包括以下制备步骤：
(1)原材料的配制：针叶浆60重量份、阔叶浆40重量份、阴离子聚丙烯酰胺0.8重量份、聚乙烯亚胺2重量份、10重量份改性聚氨酯；
(2)将针叶浆打浆至40°SR，将所述阔叶浆打浆至42°SR，再将针叶浆料与阔叶浆料混合，调节pH，搅拌均匀，得到纸基浆料；
(3)将步骤(1)的所述改性聚氨酯加入所述纸基浆料中，分散均匀后再加入所述阴离子聚丙烯酰胺及所述聚乙烯亚胺，混合均匀后进行抄纸；
(4)干燥。
所述改性聚氨酯以聚甲基乙撑碳酸酯、丙烯酸树脂、环氧树脂改性聚氨酯而得，所述聚氨酯为线性结构。聚甲基乙撑碳酸酯、丙烯酸树脂、环氧树脂、聚氨酯的用量比以重量份计为2：2.8：1.2：4.3。
实施例三
一种包装用可热封特种纸的制备方法，包括以下制备步骤：
(1)原材料的配制：针叶浆50重量份、阔叶浆70重量份、阴离子聚丙烯酰胺1重量份、聚乙烯亚胺3重量份、15重量份改性聚氨酯；
(2)将针叶浆打浆至42°SR，将所述阔叶浆打浆至45°SR，再将针叶浆料与阔叶浆料混合，调节pH，搅拌均匀，得到纸基浆料；
(3)将步骤(1)的所述改性聚氨酯加入所述纸基浆料中，分散均匀后再加入所述阴离子聚丙烯酰胺及所述聚乙烯亚胺，混合均匀后进行抄纸；
(4)干燥。
所述改性聚氨酯以聚甲基乙撑碳酸酯、丙烯酸树脂、环氧树脂、歧化松香改性聚氨酯而得，所述聚氨酯为线性结构。聚甲基乙撑碳酸酯、丙烯酸树脂、环氧树脂、聚氨酯、歧化松香的用量比以重量份计为2.3：3.6：1.3：4.5：0.4。
性能测试表
尽管结合优选实施方案具体展示和介绍了本发明，但所属领域的技术人员应该明白，在不脱离所附权利要求书所限定的本发明的精神和范围内，在形式上和细节上可以对本发明做出各种变化，均为本发明的保护范围。
Claims (8)
1.一种包装用可热封特种纸的制备方法，其特征在于，包括以下制备步骤：
(1)原材料的配制：针叶浆50－70重量份、阔叶浆30－50重量份、阴离子聚丙烯酰胺0.3－1重量份、聚乙烯亚胺0.5－3重量份、5－15重量份改性聚氨酯；
(2)将针叶浆打浆至38－42°SR，将所述阔叶浆打浆至40－45°SR，再将针叶浆料与阔叶浆料混合，调节pH，搅拌均匀，得到纸基浆料；
(3)将步骤(1)的所述改性聚氨酯加入所述纸基浆料中，分散均匀后再加入所述阴离子聚丙烯酰胺及所述聚乙烯亚胺，混合均匀后进行抄纸；
(4)干燥。
2.根据权利要求1所述的一种包装用可热封特种纸的制备方法，其特征在于：所述改性聚氨酯以聚甲基乙撑碳酸酯和丙烯酸树脂改性聚氨酯而得。
3.根据权利要求2所述的一种包装用可热封特种纸的制备方法，其特征在于：所述聚氨酯为线性结构。
4.根据权利要求2所述的一种包装用可热封特种纸的制备方法，其特征在于：所述聚甲基乙撑碳酸酯、丙烯酸树脂、聚氨酯的用量比以重量份计＝1.5－2.3：2.4－3.6：5.4－5.8。
5.根据权利要求2所述的一种包装用可热封特种纸的制备方法，其特征在于：所述改性聚氨酯以聚甲基乙撑碳酸酯、丙烯酸树脂、环氧树脂改性聚氨酯而得。
6.根据权利要求5所述的一种包装用可热封特种纸的制备方法，其特征在于：聚甲基乙撑碳酸酯、丙烯酸树脂、环氧树脂、聚氨酯的用量比以重量份计为1.5－2.3：2.4－3.6：1－1.3：4.2－4.5。
7.根据权利要求6所述的一种包装用可热封特种纸的制备方法，其特征在于：还包括0.2－0.4重量份的增粘树脂。
8.根据权利要求7所述的一种包装用可热封特种纸的制备方法，其特征在于：所述增粘树脂为歧化松香。
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