CN114108366A - 一种高阻隔、高湿强功能纸的制备方法 - Google Patents
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Abstract
本发明涉及造纸工艺领域,具体涉及一种高阻隔、高湿强功能纸的制备方法。本发明首先通过纤维素、壳聚糖和丁烷四羧酸在酸性条件下进行反应得到一种造纸添加剂,进一步使用所述造纸添加剂和硅烷偶联剂以及纳米二氧化硅配合造纸,得到一种高阻隔、高湿强功能纸。
Description
技术领域
本发明涉及造纸工艺领域,具体涉及一种高阻隔、高湿强功能纸的制备方法。
背景技术
湿强性是指纸张被水浸润后,其纤维仍具有较好的机械强度,对于多种功能性纸如薄页纸、包装纸、印刷纸、钞票纸、邮票纸等,湿强性是其重要的性能之一,纸张的湿强性不仅取决于纤维自身特性,还取决于纤维与纤维的节点数量及结合强度在造纸配料中添加各种化学添加剂,可促进湿纤维网的形成,并最终提高纸张的强度性能。常用的造纸湿强剂有聚酰胺多胺环氧氯丙烷(PAE)、脲醛树脂(UF)、三聚氰胺甲醛树脂(MF)、聚丙烯酰胺乙二醛、聚乙烯亚胺(PEI)和双醛淀粉(DAS)等。
高阻隔纸一般是指能有效减少或防止水分、油脂、水蒸气、氧气等物质渗透的纸质材料,常见处理方法是在纸张表面使用高分子涂层覆盖,但是高分子涂层往往存在污染和食用毒性等不环保或不安全因素,且纸张和高分子涂层间的相容性也是本领域技术人员需要解决的问题。
中国专利申请CN109082938A公开了一种加强型造纸湿强剂,湿强剂由以下成分按照重量比组成:黄原胶为8~9份、阿拉伯胶为2~3份、羧甲基淀粉为3~6份、醋酸为1~3份、聚乙烯醇为8~10份、亚甲基丁二酸为4~6份、纯净水为255~270份。将湿强剂的各成分进行复配、混合、机械搅拌等步骤制备得到湿强剂。制备得到的湿强剂可以提高纸张的抗撕裂强度,防止纸制品撕裂的现象产生。
中国专利申请CN109162144A公开了一种纸与纸制品湿强增效剂的制备方法及应用。该方法包括如下步骤:(1)将纤维原料加入碱溶液进行抽提,过滤,取滤液,得到半纤维素溶液;再向半纤维素溶液中加入有机溶剂,静置,离心,干燥,得到半纤维素;(2)将步骤(1)中得到的半纤维素分散到有机溶剂中,然后加入碱溶液进行碱化反应,再加入氯乙酸进行醚化反应,待反应结束后过滤,洗涤,真空干燥,得到纸与纸制品湿强增效剂。
中国专利申请CN108130817A公开了一种涂布纸及其制备方法,该涂布纸包括原纸和涂覆于原纸表面的阻隔涂层,其中,所述阻隔涂层的原料按重量份计,包括以下组分:10~30份丁苯乳液、60~80份聚偏二氯乙烯乳液、5~10份乙烯-醋酸乙烯共聚物和0.5~2份助剂,所述涂布纸是将所述阻隔涂层的原料涂覆于原纸层的表面,并进行热处理,形成阻隔涂层,所得涂布纸氧气透过率小于350cm3/m2.d.MPa,水蒸气透过率小于350g/m2.24hr。
发明内容
本发明的目的是提供一种高阻隔、高湿强功能纸的制备方法。
本发明的目的通过以下技术方案实现。
一方面,本发明提供一种具有阻隔、湿强功能的造纸添加剂的制备方法,包括以下步骤:
S1:将纤维素、壳聚糖和丁烷四羧酸在酸性条件下进行反应,反应完成后,使用碱溶液中和反应体系,脱盐、浓缩、干燥即得所述造纸添加剂。
进一步地,S1,按重量分数计,各组分用量为:
纤维素100-150份,壳聚糖30-50份,丁烷四羧酸5-10份。
进一步地,S1中,纤维素的重均分子量为50000-100000,壳聚糖的重均分子量为150000-200000。
进一步地,S1中,所述酸性条件为硫酸溶液,硫酸浓度为80-85%,硫酸溶液的用量为2000-3000份。
进一步地,S1中,反应体系中混合物的重均分子量为30000-50000时,停止反应。
另一方面,本发明提供一种高阻隔、高湿强功能纸的制备方法,包括以下步骤:
SS1:将漂白针叶木浆加水浸泡,打浆得浆液;
SS2:加入S1制备得到的造纸添加剂、硅烷偶联剂和纳米二氧化硅,后经抄片,固化,即得所述功能纸。
进一步地:SS1中,所述打浆中,打浆浓度为1.4-1.8%,打浆度为33-38°SR。
进一步地,SS1中,所述打浆中,打浆浓度为1.5-1.4%,打浆度为35-36°SR。
进一步地,SS2中,每100mL浆液中添加造纸添加剂10-15g,硅烷偶联剂1-5g,纳米二氧化硅0.1-0.5g。
进一步地,所述纳米二氧化硅的粒径选自30-50nm。
进一步地,所述硅烷偶联剂选自氨基三乙氧基硅烷、(甲基丙烯酰基)丙基三甲氧基硅烷、乙烯基三乙氧基硅烷或苯胺甲基三乙氧基硅烷中的至少一种。
进一步地,SS2中,所述抄片按绝对干浆用量为2.5-3g进行。
进一步地,SS2中,所述固化是在100-110℃,固化15-20min。
本发明的优势在于:
1.本发明利用化学平衡,将纤维素、壳聚糖和丁烷四羧酸在酸性条件下,在发生糖的水解的同时以丁烷四羧酸为核心进行酯化,通过调控反应体系的重均分子量,得到一种造纸添加剂。
2.本发明的造纸添加剂在造纸过程中和纳米化硅以及硅烷偶联剂搭配,在造纸过程中对纸张进行改性,可以使纸张具有较好的水蒸气阻隔性能和湿强性能。
3.本发明的造纸添加剂只需在造纸过程中直接添加在纸浆中即可,不需采用浸泡、涂布、沉积等手段,对纸张进行改性时操作简单、使用方便。
具体实施方式
添加剂实施例1
一种造纸添加剂的制备方法,包括以下步骤
将纤维素(重均分子量50000)100g、壳聚糖(重均分子量200000)50g和丁烷四羧酸8g在80%硫酸溶液2000mL下进行反应,监控反应体系中高分子混合物的重均分子量为(重均分子量30000-33000)时,使用饱和NaOH溶液中和反应体系至pH=6.5-7,脱盐、浓缩、干燥即得所述造纸添加剂。
添加剂实施例2
一种造纸添加剂的制备方法,包括以下步骤
将纤维素(重均分子量100000)150g、壳聚糖(重均分子量150000)30g和丁烷四羧酸10g在85%硫酸溶液3000mL下进行反应,监控反应体系中高分子混合物的重均分子量为(45000-48000)时,使用饱和NaOH溶液中和反应体系至pH=6.5-7,脱盐、浓缩、干燥即得所述造纸添加剂。
添加剂实施例3
一种造纸添加剂的制备方法,包括以下步骤
将纤维素(重均分子量80000)120g、壳聚糖(重均分子量180000)50g和丁烷四羧酸5g在80%硫酸溶液3000mL下进行反应,监控反应体系中高分子混合物的重均分子量为40000-43000时,使用饱和NaOH溶液中和反应体系至pH=6.5-7,脱盐、浓缩、干燥即得所述造纸添加剂。
功能纸实施例4
一种高阻隔、高湿强功能纸的制备方法
SS1:将漂白针叶木浆加水浸泡,打浆得浆液,打浆浓度为1.5-1.6%,打浆度为35-36°SR;
SS2:加入S1制备得到的造纸添加剂、硅烷偶联剂和纳米二氧化硅,后经抄片,固化,即得所述功能纸;
其中,每100mL浆液中添加实施例1制备的造纸添加剂12g,氨基三乙氧基硅烷5g,纳米二氧化硅(粒径50nm)0.3g;
抄片量按绝对干浆用量为3.0g;
固化条件为105℃,固化15分钟。
功能纸实施例5
一种高阻隔、高湿强功能纸的制备方法
SS1:将漂白针叶木浆加水浸泡,打浆得浆液,打浆浓度为1.5-1.6%,打浆度为35-36°SR;
SS2:加入S1制备得到的造纸添加剂、硅烷偶联剂和纳米二氧化硅,后经抄片,固化,即得所述功能纸;
其中,每100mL浆液中添加实施例2制备的造纸添加剂15g,(甲基丙烯酰基)丙基三甲氧基硅烷10g,纳米二氧化硅(粒径30nm)0.1g;
抄片量按绝对干浆用量为3.0g;
固化条件为105℃,固化15分钟。
功能纸实施例6
一种高阻隔、高湿强功能纸的制备方法
SS1:将漂白针叶木浆加水浸泡,打浆得浆液,打浆浓度为1.5-1.6%,打浆度为35-36°SR;
SS2:加入S1制备得到的造纸添加剂、硅烷偶联剂和纳米二氧化硅,后经抄片,固化,即得所述功能纸;
其中,每100mL浆液中添加实施例3制备的造纸添加剂10g,苯胺甲基三乙氧基硅烷7g,纳米二氧化硅(粒径30nm)0.5g;
抄片量按绝对干浆用量为3.0g;
固化条件为105℃,固化15分钟。
对比例1
和实施例4的区别在于,造纸添加剂制备时,只使用150g纤维素。
对比例2
和实施例4的区别在于,造纸添加剂制备时,只使用150g壳聚糖。
对比例3
和实施例4的区别在于,造纸添加剂制备时,不加丁烷四羧酸。
性能测试1-阻隔性
参考《GB/T22921-2008纸和纸板薄页材料水蒸气透过率的测定动态气流法和静态气体法》中静态气体法测定各组纸张的水蒸气透过率,设置温度40±0.5℃、相对湿度90±2%的条件下进行测定,实验结果见表1。
表1水蒸气透过率测试结果
性能测试2-湿强性
参考《GB/T 465.2-2008纸和纸板浸水后抗张强度的测定》
各组测试浸水时间为2h,浸水后纸张抗张强度保留率实验结果如表2。
表2抗张强度保留率实验结果
可以看出,纤维素和壳聚糖混合水解的同时水解片段以丁烷四羧酸为核心酯化后得到一定分子量范围内的混合物,可以在造纸工艺中对成品带来较好的抗张强度保留率以及较低的水蒸气透过率,得到湿强性较好、水蒸气透过率较低的纸张。
最后应当说明的是,以上内容仅用以说明本发明的技术方案,而非对本发明保护范围的限制,本领域的普通技术人员对本发明的技术方案进行的简单修改或者等同替换,均不脱离本发明技术方案的实质和范围。
Claims (10)
1.一种具有阻隔、湿强功能的造纸添加剂的制备方法,包括以下步骤:
S1:将纤维素、壳聚糖和丁烷四羧酸在酸性条件下进行反应,反应完成后,使用碱溶液中和反应体系,脱盐、浓缩、干燥即得所述造纸添加剂。
2.根据权利要求1所述的制备方法,其特征在于,S1中,按重量分数计,各组分用量为:
纤维素100-150份,壳聚糖30-50份,丁烷四羧酸5-10份。
3.根据权利要求1所述的制备方法,其特征在于,S1中,纤维素的重均分子量为50000-100000,壳聚糖的重均分子量为150000-200000。
4.根据权利要求1所述的制备方法,其特征在于,S1中,所述酸性条件为硫酸溶液,硫酸浓度为80-85%,硫酸溶液的用量为2000-3000份。
5.根据权利要求1-4任一项所述的制备方法,其特征在于,S1中,反应体系中混合物的重均分子量为30000-50000时,停止反应。
6.一种高阻隔、高湿强功能纸的制备方法,包括以下步骤:
SS1:将漂白针叶木浆加水浸泡,打浆得浆液;
SS2:加入权利要求1-5任一项制备方法制备得到的造纸添加剂、硅烷偶联剂和纳米二氧化硅,后经抄片,固化,即得所述功能纸。
7.根据权利要求6所述的制备方法,其特征在于,SS1中,所述打浆中,打浆浓度为1.4-1.8%,打浆度为33-38°SR。
8.根据权利要求6所述的制备方法,其特征在于,SS2中,每100mL浆液中添加造纸添加剂10-15g,硅烷偶联剂1-5g,纳米二氧化硅0.1-0.5g。
9.根据权利要求6所述的制备方法,其特征在于,SS2中,所述抄片按绝对干浆用量为2.5-3g进行。
10.根据权利要求6所述的制备方法,其特征在于,SS2中,所述固化是在100-110℃,固化15-20min。
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