CN114197245A - 一种耐热型纸吸管里纸及其制备方法 - Google Patents
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Abstract
本发明涉及纸张生产技术领域的一种耐热型纸吸管里纸,包括浆料、中性施胶剂、羧甲基改性壳聚糖无氯湿强剂、CPAM,所述浆料包括漂白针叶木浆、漂白阔叶木浆、漂白化机浆,三者质量比为40‑50%:30‑40%:10‑30%。与现有技术相比,本发明的有益效果是:实现纸吸管里纸的表面超疏水,大幅提高抗水性和湿强度,对纸吸管里纸进行表面耐热处理,达到耐热目的,可在热饮中安全使用。
Description
技术领域
本发明涉及纸张生产技术领域,具体为一种耐热型纸吸管里纸及其制备方法。
背景技术
以纸吸管代替塑料吸管已形成必然趋势。但目前市场上纸吸管推广应用的问题主要是使用者的体验感不佳,如“戳不开杯子的塑封膜”、“中途容易断掉或软化散开”、“喝的时候有纸浆味道”、“再也不能咬吸管了”等等。纸吸管的这些问题主要来自于纸基吸管材料的本身质量以及纸吸管加工过程添加的助剂等。
基于此,本发明设计了一种耐热型纸吸管里纸及其制备方法,以解决上述问题。
发明内容
本发明的目的在于提供一种耐热型纸吸管里纸及其制备方法,以解决上述背景技术中提出的问题。
为实现上述目的,本发明提供如下技术方案:一种耐热型纸吸管里纸,包括浆料、中性施胶剂、羧甲基改性壳聚糖无氯湿强剂、CPAM,所述浆料包括漂白针叶木浆、漂白阔叶木浆、漂白化机浆,三者质量比为40-50%:30-40%:10-30%。
如上所述的一种耐热型纸吸管里纸中,所述浆料、羧甲基改性壳聚糖无氯湿强剂、CPAM的质量比为1:0.02-0.04:0.002-0.005: 0.004-0.006。
如上所述的一种耐热型纸吸管里纸中,将所述浆料中的漂白针叶木浆、漂白阔叶木浆、漂白化机浆分别打浆,配比后混合精浆至 38-41°SR,备用,取一定量上述浆料,添加中性施胶剂、羧甲基改性壳聚糖无氯湿强剂、CPAM,混合均匀后用纸页成型器抄成原纸。
如上所述的一种耐热型纸吸管里纸制备方法,包括如下步骤:
步骤1、采用浆内ASA中性施胶、羧甲基改性壳聚糖无氯增湿强工艺制备纸吸管里纸;
步骤2、用柠檬酸对纸吸管里纸进行预浸处理;
步骤3、使用疏水改性剂、交联剂、纳米纤维素或纳米蒙脱土在纸吸管里纸表面构建超疏水的微纳粗糙结构,并通过表面进一步增湿强度和耐温处理后,再用AKD表面抗水处理,得到耐热型纸吸管里纸,使得抄造的纸吸管里纸具有较好的物理张强度。
如上所述的一种耐热型纸吸管里纸制备方法中,所述疏水改性剂包括十六烷基三甲氧基硅烷。
如上所述的一种耐热型纸吸管里纸制备方法中,所述交联剂包括 3-氨基丙基三乙氧基硅烷。
如上所述的一种耐热型纸吸管里纸制备方法中,所述步骤1中,
羧甲基改性壳聚糖无氯湿强剂制备方法:称取一定量的壳聚糖于一定量的异丙醇中,加入一定质量分数的氢氧化钠溶液碱化数小时,再加入一定量的氯乙酸,在水浴中加热羧甲基化反应数小时,冷至室温,并用冰醋酸调解至中性,再用乙醇反复洗涤,55℃烘干,得羧甲基壳聚糖。将所得的产品溶于水,真空干燥,得到精制羧甲基壳聚糖,壳聚糖:氯乙酸:氢氧化钠:异丙醇的质量比=1:0.6-1.0:0.3-0.5: 1.5-2.0。
如上所述的一种耐热型纸吸管里纸制备方法中,所述步骤3中,
纳米纤维素和纳米蒙脱土悬浮液的制备方法:称取纳米蒙脱土溶于去离子水中,以200rpm的速率搅拌30min,加入次亚磷酸钠,继续搅拌10min后得到稳定的纳米蒙脱土悬浮液,取上述制备的悬浮液和自制的纳米纤维素溶液,加入去离子水,在搅拌器中以300rpm的速率搅拌30min后,得到55-70mL的纳米纤维素和纳米蒙脱土悬浮液。
如上所述的一种耐热型纸吸管里纸制备方法中,所述步骤3中,
表面耐热处理剂制备方法:称取一定量双氰胺、聚丙烯酰胺和水性聚氨酯耐热剂于烧杯中,加入去离子水,在60℃水浴下搅拌30min 使其完全溶解。
如上所述的一种耐热型纸吸管里纸制备方法中,质量比双氰胺:聚丙烯酰胺:水性聚氨酯=1:0.1-0.3:0.1-0.3。
与现有技术相比,本发明的有益效果是:实现纸吸管里纸的表面超疏水,大幅提高抗水性和湿强度,对纸吸管里纸进行表面耐热处理,达到耐热目的,可在热饮中安全使用。
附图说明
为了更清楚地说明本发明实施例的技术方案,下面将对实施例描述所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其他的附图。
图1为本发明实施例的流程示意图;
图2为本发明中耐热型纸吸管里纸制备方法的流程示意图。
具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
请参阅图1-2,本发明提供一种技术方案:通过采用浆内ASA中性施胶、羧甲基改性壳聚糖无氯增湿强工艺制备纸吸管里纸,用柠檬酸对纸吸管里纸进行预浸处理;以3-氨基丙基三乙氧基硅烷为交联剂,以十六烷基三甲氧基硅烷为疏水改性剂,使用纳米纤维素(CNFs) /纳米蒙脱土在纸吸管里纸表面构建超疏水的微纳粗糙结构,并通过表面进一步增湿强度和耐温处理后,再用AKD表面抗水处理,得到耐热型纸吸管里纸,使得抄造的纸吸管里纸具有较好的物理张强度,并使其满足热饮吸食过程中的超疏水性和耐热要求,同时具有安全、绿色环保、可生物降解的特点。
羧甲基改性壳聚糖无氯湿强剂制备:
壳聚糖属无氯绿色增强剂,但不溶于水,使用不便,故对其进行羧甲基化改性,提高其水溶性,便于使用。
称取一定量的壳聚糖于一定量的异丙醇中,加入一定质量分数的氢氧化钠溶液碱化数小时,再加入一定量的氯乙酸,在水浴中加热羧甲基化反应数小时,冷至室温,并用冰醋酸调解至中性。再用乙醇反复洗涤,55℃烘干,得羧甲基壳聚糖。将所得的产品溶于水,真空干燥,得到精制羧甲基壳聚糖。壳聚糖:氯乙酸:氢氧化钠:异丙醇的质量比=1:0.6-1.0:0.3-0.5:1.5-2.0。
称取5.0g水溶改性羧甲基壳聚糖于烧杯中,加入300ml去离子水,在25℃水浴下搅拌30min使其完全溶解。
柠檬酸/次亚磷酸钠溶液的制备:
将质量分数为8.0%的柠檬酸(CA)和4%的次亚磷酸钠(NaH2PO2H2O) 混合,添加一定量去离子水配成200mL溶液,在搅拌器中以300rpm 的速率搅拌30min。
纳米纤维素(CNFs)/纳米蒙脱土悬浮液的制备:
称取5g纳米蒙脱土溶于500mL去离子水中,以200rpm的速率搅拌30min,加入0.35-0.5g次亚磷酸钠,继续搅拌10min后得到稳定的纳米蒙脱土悬浮液。取上述制备的悬浮液5mL和自制的 CNFs溶液10-15mL,加入40-50mL去离子水,在搅拌器中以300rpm 的速率搅拌30min后,得到55-70mL的CNFs/纳米蒙脱土悬浮液。
表面耐热处理剂制备:
称取一定量双氰胺、聚丙烯酰胺和水性聚氨酯耐热剂于烧杯中,加入300ml去离子水,在60℃水浴下搅拌30min使其完全溶解。质量比双氰胺:聚丙烯酰胺:水性聚氨酯=1:0.1-0.3:0.1-0.3。
超疏水耐热浸渍液制备:
向装有搅拌器、温度计的500ml的三颈烧瓶中依次加入纳米纤维素(CNFs)/纳米蒙脱土悬浮液、3-氨基丙基三乙氧基硅烷、十六烷基三甲基硅烷,调节水浴温度为40-60℃,搅拌速度为200-500rpm 下反应2-4h,再加入羧甲基改性壳聚糖无氯湿强剂、表面耐热处理剂,得到超疏水耐热浸渍液。
纳米纤维素(CNFs)/纳米蒙脱土悬浮液:3-氨基丙基三乙氧基硅烷:十六烷基三甲基硅烷:羧甲基改性壳聚糖无氯湿强剂:表面耐热处理剂的体积比为=1:1.1-2.2:2.1-4.2:1.0-1.8:1.5-2.5。
耐热型纸吸管里纸的制备:
耐热型纸吸管里纸的纤维组成为漂白针叶木浆:漂白阔叶木浆和漂白化机浆,其质量比为40-50%:30-40%:10-30%。将三种木浆分别打浆,配比后混合精浆至38-41°SR,备用。取一定量上述浆料,添加中性施胶剂ASA、羧甲基改性壳聚糖无氯湿强剂、CPAM等造纸助剂,混合均匀后用纸页成型器抄成原纸。方案所述各种物质质量比为浆料:ASA:羧甲基改性壳聚糖无氯湿强剂:CPAM=1:0.02-0.04: 0.002-0.005:0.004-0.006。
方案所述纸吸管里纸表面改性使用的悬浮液主要成分为质量分数为8%的柠檬酸和4%的次亚磷酸钠,将上述抄好的原纸放入此混合溶液中浸渍1h后取出;烘干后用超疏水耐热浸渍液进行浸渍 20-30min,再经AKD表面施涂后制得耐热型纸吸管里纸。
所述制备的耐热型纸吸管里纸的定量为100-150g/m2
所制备的耐热型纸吸管里纸的接触角达到151-152°,符合超疏水的条件。118g/m2的纸页,在105℃烘箱处理24h,其纵向抗张强度为6.0kN/m,纵向湿抗张强度为0.8kN/m,横向撕裂度为897mN,耐破度为265kpa,比老化前下降15-20%,强度保持性良好。
实现纸吸管里纸的表面超疏水,大幅提高抗水性和湿强度。
本发明通过采用浆内ASA中性施胶、羧甲基改性壳聚糖无氯增湿强工艺制备纸吸管里纸,用柠檬酸对纸吸管里纸进行预浸处理;以 3-氨基丙基三乙氧基硅烷为交联剂,以十六烷基三甲氧基硅烷为疏水改性剂,使用纳米纤维素(CNFs)/纳米蒙脱土在纸吸管里纸表面构建超疏水的微纳粗糙结构,并通过表面进一步增湿强度处理后,再用AKD表面处理,得到超疏水的纸吸管里纸,使其满足热饮吸食过程中的高抗水性要求,并使得抄造的纸吸管里纸具有较好的物理强度,同时具有安全、绿色环保、可生物降解的特点,减少健康风险和环境压力。
本发明采用浆内ASA中性施胶、改性壳聚糖增湿强以提高纸张的内部抗水性和湿强度;用柠檬酸(CA)对纸吸管里纸表面进行活化预处理,在催化剂次亚磷酸钠的作用下,CA中大量的羧基与纸张表面上的羟基发生交联改性,CA改性后的自由羧基再与纳米蒙脱土的羟基发生酯化反应可以提高纸张表面纳米蒙脱土的负载量。利用CNFs具有大比表面积、高机械强度、低密度、可生物降解性等特点,可与无机颗粒纳米蒙脱土构建超疏水表面所需的微纳粗糙结构。柠檬酸(CA) 与纸页纤维通过酯键结合,并在纸页表面引入了羧基基团,这不仅可以和纳米纤维素(CNFs)表面的羟基化学交联,还可以和3-氨基丙基三乙氧基硅烷改性后引入的氨基基团发生化学交联,形成致密的三维网状结构,从而提高纸页超疏水性能的持续有效性。
对纸吸管里纸进行表面耐热处理,达到耐热目的,可在热饮中安全使用。
植物纤维纸中的纤维素大分子具有较高的亲水性,在高温环境下,会导致葡萄糖单体间的糖苷键遭受水分的作用而使得纤维素断裂,造成纸页老化,强度等物理性能下降。本发明以双氰胺、水性聚氨酯、聚丙烯酰胺为复合表面耐热处理剂,通过表面施涂形式添加于纸页中,耐热剂与老化过程中产生的水分、小分子羧酸等发生反应,从而达到减缓纸页老化速率的目的,增加纸页的抗热老化能力。使其满足热饮吸食过程中的耐热要求,保证强度,保证管子不软化吸扁。
本发明工艺简单、无污染、生产成本较低,纸吸管里纸抗水性能好、持久,耐热性好,物理强度好,可用于高疏水、耐温的热饮吸食过程使用环境,而且具有安全、绿色环保、可生物降解的特点,从而也减少健康风险和环境压力。本实施例中,阳离子聚丙烯酰胺(CPAM) 是线型高分子化合物,由于它具有多种活泼的基团,可与许多物质亲和、吸附形成氢键。主要是絮凝带负电荷的胶体,具有除浊、脱色、吸附、粘合等功能,适用于染色、造纸、食品、建筑、冶金、选矿、煤粉、油田、水产加工与发酵等行业有机胶体含量较高的废水处理,特别适用于城市污水、城市污泥、造纸污泥及其它工业污泥的脱水处理。
本说明书的描述中,参考术语“一个实施例”、“示例”、“具体示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不一定指的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。以上公开的本发明优选实施例只是用于帮助阐述本发明。优选实施例并没有详尽叙述所有的细节,也不限制该发明仅为所述的具体实施方式。显然,根据本说明书的内容,可作很多的修改和变化。本说明书选取并具体描述这些实施例,是为了更好地解释本发明的原理和实际应用,从而使所属技术领域技术人员能很好地理解和利用本发明。本发明仅受权利要求书及其全部范围和等效物的限制。
Claims (10)
1.一种耐热型纸吸管里纸,其特征在于,包括浆料、中性施胶剂、羧甲基改性壳聚糖无氯湿强剂、CPAM,所述浆料包括漂白针叶木浆、漂白阔叶木浆、漂白化机浆,三者质量比为40-50%:30-40%:10-30%。
2.根据权利要求1所述的一种耐热型纸吸管里纸,其特征在于,所述浆料、羧甲基改性壳聚糖无氯湿强剂、CPAM的质量比为1:0.02-0.04:0.002-0.005:0.004-0.006。
3.根据权利要求1所述的一种耐热型纸吸管里纸,其特征在于,将所述浆料中的漂白针叶木浆、漂白阔叶木浆、漂白化机浆分别打浆,配比后混合精浆至38-41°SR,备用,取一定量上述浆料,添加中性施胶剂、羧甲基改性壳聚糖无氯湿强剂、CPAM,混合均匀后用纸页成型器抄成原纸。
4.一种耐热型纸吸管里纸制备方法,其特征在于,包括如下步骤:
步骤1、采用浆内ASA中性施胶、羧甲基改性壳聚糖无氯增湿强工艺制备纸吸管里纸;
步骤2、用柠檬酸对纸吸管里纸进行预浸处理;
步骤3、使用疏水改性剂、交联剂、纳米纤维素或纳米蒙脱土在纸吸管里纸表面构建超疏水的微纳粗糙结构,并通过表面进一步增湿强度和耐温处理后,再用AKD表面抗水处理,得到耐热型纸吸管里纸,使得抄造的纸吸管里纸具有较好的物理张强度。
5.根据权利要求4所述的一种耐热型纸吸管里纸制备方法,其特征在于,所述疏水改性剂包括十六烷基三甲氧基硅烷。
6.根据权利要求4所述的一种耐热型纸吸管里纸制备方法,其特征在于,所述交联剂包括3-氨基丙基三乙氧基硅烷。
7.根据权利要求4所述的一种耐热型纸吸管里纸制备方法,其特征在于,所述步骤1中,
羧甲基改性壳聚糖无氯湿强剂制备方法:称取一定量的壳聚糖于一定量的异丙醇中,加入一定质量分数的氢氧化钠溶液碱化数小时,再加入一定量的氯乙酸,在水浴中加热羧甲基化反应数小时,冷至室温,并用冰醋酸调解至中性,再用乙醇反复洗涤,55℃烘干,得羧甲基壳聚糖。将所得的产品溶于水,真空干燥,得到精制羧甲基壳聚糖,壳聚糖:氯乙酸:氢氧化钠:异丙醇的质量比=1:0.6-1.0:0.3-0.5:1.5-2.0。
8.根据权利要求4所述的一种耐热型纸吸管里纸制备方法,其特征在于,所述步骤3中,
纳米纤维素和纳米蒙脱土悬浮液的制备方法:称取纳米蒙脱土溶于去离子水中,以200rpm的速率搅拌30min,加入次亚磷酸钠,继续搅拌10min后得到稳定的纳米蒙脱土悬浮液,取上述制备的悬浮液和自制的纳米纤维素溶液,加入去离子水,在搅拌器中以300rpm的速率搅拌30min后,得到55-70mL的纳米纤维素和纳米蒙脱土悬浮液。
9.根据权利要求4所述的一种耐热型纸吸管里纸制备方法,其特征在于,所述步骤3中,
表面耐热处理剂制备方法:称取一定量双氰胺、聚丙烯酰胺和水性聚氨酯耐热剂于烧杯中,加入去离子水,在60℃水浴下搅拌30min使其完全溶解。
10.根据权利要求9所述的一种耐热型纸吸管里纸制备方法,其特征在于,质量比双氰胺:聚丙烯酰胺:水性聚氨酯=1:0.1-0.3:0.1-0.3。
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