CN115516167A - 生产纳米涂覆的基材的工艺 - Google Patents
生产纳米涂覆的基材的工艺 Download PDFInfo
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- CN115516167A CN115516167A CN202180032859.9A CN202180032859A CN115516167A CN 115516167 A CN115516167 A CN 115516167A CN 202180032859 A CN202180032859 A CN 202180032859A CN 115516167 A CN115516167 A CN 115516167A
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Abstract
本发明涉及制造纳米涂覆的基于浆的基材的方法,包括以下步骤:a)提供包含浆的悬浮体,所述浆具有至少70°的Schopper Riegler值;b)使用步骤a)的悬浮体以形成湿幅材;c)将湿幅材脱水和/或干燥以形成基材;d)将包含小于2wt‑%水的丙烯酸类单体溶液的第一层添加至基材的表面,接着辐射固化第一层;e)任选地将包含丙烯酸类单体溶液的第二层添加至经固化的第一层的表面并且辐射固化第二层;f)在经固化的第一层或第二层的表面上提供纳米涂层使得在基材上提供具有在0.1nm至100nm的范围内的厚度的纳米涂层。
Description
技术领域
本发明涉及制造纳米涂覆的基于浆(pulp,纸浆)的基材的工艺。
背景技术
包含大量的微原纤化纤维素(MFC)的膜和阻隔纸在本领域是已知的。取决于如何生产它们,膜可具有特别有利的强度和/或阻隔性质,同时是可生物降解且可再生的。包含MFC的膜例如用于制造包装材料并且可被层压或以其他方式提供在纸或纸板材料的表面上。
MFC膜的阻隔性质已知可被水或水分(moisture,湿气)负面影响。多种化学和机械方案已经被测试,比如用热塑性聚合物层压。
需要制备经表面处理的基于浆的基材的有效方法,所述表面处理的基材还提供阻隔和强度性质。
另外,期望的是这样的表面处理的基材可为可堆肥的和/或易于可再循环和/或可再制浆的并且基本上不含塑料。然而,当在基于纤维素的基材上提供涂层和表面处理时,可产生问题。如果分散体或基于水的溶液施加至薄幅材或基材上,基材破裂或可发生尺寸稳定性的问题。这是因为水吸收并且渗透至亲水基材中,影响纤丝、纤维和添加剂之间的氢键。
一种方案是提高施加的溶液的固体物,尽管这通常导致更高的涂覆重量和更高的溶液粘度。另一方面,高粘度对基材产生更高的应力和通常更高的涂覆重量。
出于这些原因,提供充分的阻隔性质是困难的,尤其是在低涂覆重量下。
因此,铝箔或成膜聚合物比如胶乳或热塑性聚合物被用于这些目的并且通常提供对于油或油脂和/或气味或气体(比如氧)的渗透或扩散方面足够的性质。铝或成膜聚合物还提供强化的水蒸气阻隔性质,这对于在高相对湿度条件下的阻隔和包装功能性或对于减少被包装的液体产品的蒸发是重要的。
然而,使用铝箔的一个问题是其具有环境挑战,在再循环工艺中可构成问题,并且取决于使用的量,可导致包装材料不可堆肥。因此期望使用尽可能低的量的铝。然而,同时保持包装材料的阻隔性质是必须的。
本领域已知提供可为有机或无机的纳米涂层,比如陶瓷或金属纳米涂层。纳米涂层非常薄,比如约0.1nm至约100nm厚。例如,金属化的表面使用非常少量的金属或金属氧化物(比如铝或TiO2,Al2O3,MgO或ZnO)。例如,原子层沉积(ALD)、动态复合沉积(DCD)、化学气相沉积(CVD),比如等离子体CVD,物理气相沉积(PVD)和金属等离子体沉积是适合在表面上提供少量金属的技术。然而,包装材料,在提供有纳米涂层(比如金属化的)时,可保持阻隔性质并且是充分抗裂性的仍是必须的。
成膜聚合物比如胶乳和热塑性化石基聚合物的一个问题在于获得的包装材料典型地不被认为是单材料并且可产生再循环问题。许多成膜聚合物的进一步问题在于成膜聚合物通常以水性溶液或分散体的形式提供。溶液或分散体的水含量可破坏纸基材。亲水纤维素材料典型地提供对氧的阻隔性质,但对水和水蒸气敏感。
因此,需要被调整的基材,使得非常少量的纳米涂层可被施加而不使阻隔性质劣化。
发明内容
已经令人惊奇地发现前述问题中的一些或全部可通过提供制造具有水蒸气阻隔性质的纳米涂覆的基材的改进的方法而解决。
已经令人惊奇地发现通过使用包括如下的工艺可实现有利的阻隔性质,特别是水蒸气阻隔性质:提供包含浆的悬浮体,所述浆具有至少70°的Schopper Riegler值,使用悬浮体以形成湿幅材,接着进行脱水和/或干燥,接着添加包含小于2wt-%水的丙烯酸类单体溶液的第一层,接着辐射固化第一层,任选地接着添加包含丙烯酸类单体的第二层并且辐射固化第二层,接着提供纳米涂层使得在基材上提供具有在0.1nm至100nm的范围内的厚度的纳米涂层。
因此,本发明涉及生产纳米涂覆的基材的工艺,包括以下步骤:
a)提供包含浆的悬浮体,所述浆具有至少70°的Schopper Riegler值;
b)使用步骤a)的悬浮体以形成湿幅材;
c)将湿幅材脱水和/或干燥以形成基材;
d)将包含小于2wt-%水的丙烯酸类单体溶液的第一层添加至基材的表面,接着辐射固化第一层;
e)任选地将包含丙烯酸类单体溶液的第二层添加至经固化的第一层的表面并且辐射固化第二层;
f)在经固化的第一层或第二层的表面上提供纳米涂层使得在基材上提供具有在0.1nm至100nm的范围内的厚度的纳米涂层。
因此,本发明的一个方面是纳米涂覆的基于浆的基材,其涂覆有已经固化的丙烯酸类单体溶液的第一层和任选的已经在第一经固化的层的表面上固化的丙烯酸类单体溶液的第二层,并且具有在经固化的第一层或第二层的表面上的纳米涂层,使得纳米涂层具有在0.1nm至100nm的范围内的厚度。
具体实施方式
步骤a)中使用的悬浮体包含浆,所述浆具有大于70SR°,比如70至95SR°或75至85SR°的Schopper Riegler值(SR°)。Schopper Riegler值可通过EN ISO 5267-1中定义的标准方法测定。
悬浮体中的浆可使用本领域中已知的方法生产并且可例如为硫酸盐浆,其已经被精磨以实现期望的Schopper Riegler值。浆可还包含微原纤化纤维素(MFC)。浆可为与高度精磨的浆和/或MFC混合的基本上未精磨的浆的混合物。除了浆之外,悬浮体还可包含在造纸中典型使用的添加剂。
步骤a)中的悬浮体可包含不同类型纤维的混合物,比如微原纤化纤维素,和一定量的其他类型的纤维,比如硫酸盐纤维,细料,增强纤维,合成纤维,溶解浆,TMP或CTMP,PGW,再循环的纤维/浆等。
步骤a)中的悬浮体可还包含其他工艺或功能添加剂,比如填料,颜料,湿强度化学品,助留化学品,交联剂,软化剂或增塑剂,粘附底漆,润湿剂,杀生物剂,光学染料,着色剂,荧光增白剂,消泡化学品,疏水化用化学品比如AKD,ASA,蜡,树脂等。
湿幅材可例如通过湿铺或流延成形方法形成。对于湿铺成形,该工艺可在造纸机比如长网造纸机(fourdrinier)或其他成形类型比如双成形机(Twin-former)或混合成形机(hybrid former)中进行。幅材可为单层或多层幅材或单层片或多层片幅材,由一个(种)或数个(种)流浆箱制造。
微原纤化纤维素优选具有大于70SR°,或大于75SR°,或大于80SR°的SchopperRiegler值(SR°)。微原纤化纤维素具有至少30m2/g或更优选大于60m2/g或最优选>90m2/g的表面积,当对经溶剂交换且冷冻干燥的样品根据氮吸附(BET)方法测定时。
悬浮体的微原纤化纤维素含量可在15至99.9重量%的范围内,基于悬浮体的固体物重量计。在一个实施方式中,悬浮体的微原纤化纤维素含量可在30至90重量%的范围内,在35至80重量%的范围内,或在40至60重量%的范围内。
湿幅材可例如通过湿铺和流延成形方法制备。在湿铺方法中,悬浮体被制备并且提供至多孔丝网。脱水通过丝网织物发生并且还任选地在后续压榨部发生。干燥通常使用对流(烘筒,金属带)或辐照干燥(IR)或热空气进行。典型的湿铺为例如在造纸中使用的长网造纸机成形机。在流延成形方法中,湿幅材在例如聚合物或金属带上形成并且后续初始脱水主要在一个方向上进行,比如通过使用各种已知技术的蒸发进行。
对幅材进行脱水和/或干燥使得脱水和/或干燥结束时的水分含量优选小于50wt-%,更优选小于20wt-%,最优选小于10wt-%,甚至更优选小于5wt-%。
步骤c)中获得的基材的定量,在被提供有纳米涂层之前,优选小于100g/m2,更优选小于70g/m2并且最优选小于35g/m2。所获得的基材的定量,在被提供有纳米涂层之前,为优选至少10g/m2。
优选地,基材不含含氟化学品。
步骤c)中获得的基材可任选地被表面处理,通过例如在步骤d)之前压延。步骤d)可在不同于步骤c)的机器和/或位置进行。
步骤c)中获得的基材,即在添加单体类溶液的第一层至基材的表面之前,优选具有这样的阻隔性质:其使得基材的Gurley Hill孔隙率值大于4000s/100ml,优选高于6000s/100ml且最优选高于10 000s/100ml。Gurley Hill值可使用本领域中已知的方法(ISO 5636-5)测定。
步骤c)中获得的基材典型地包含大于5个针孔/m2,比如大于8个针孔/m2或大于10个针孔/m2,如根据标准EN13676:2001所测量。
根据本发明的工艺的步骤d)涉及将丙烯酸类单体溶液的第一层添加至基材的表面,接着辐射固化第一层。单体优选为有机丙烯酸类单体。合适的单体的实例为多官能丙烯酸类单体,其包括丙烯酸异冰片酯(IBOA),三丙二醇二丙烯酸酯(TPGDA),三羟甲基丙烷三丙烯酸酯(TMPTA),二季戊四醇六丙烯酸酯(DPHA),三官能脂族氨基甲酸酯丙烯酸酯和丙烯酸苯基乙酯。典型地,溶液不含任何溶剂。如果使用溶剂,溶剂优选是非水性的(不含水)。优选地,丙烯酸类单体溶液用柔性凹版印刷术、喷墨、网版、凹版印刷术或反向凹版印刷或胶印方法或其变形方式或变体施加。丙烯酸类单体溶液还可通过幕涂、泡沫涂覆、喷涂、刀涂或例如通过印刷施加。印刷可在离线涂覆站中进行。丙烯酸类单体溶液还可通过喷雾(比如雾化形式的单体溶液)或以气体或蒸气的形式施加。除了辐射固化之外,可进行闪蒸。丙烯酸类单体溶液可还包含其他单体和/或丙烯酸类低聚物。溶液中丙烯酸类单体的量为优选至少30wt%(基于总固含量计)。
步骤d)中使用的溶液可还包含最高达20wt%(基于总固含量计)无机颜料或填料,比如纳米黏土或硅烷或硅酸盐前体。步骤d)中使用的溶液可还包含最高达20wt-%(基于总固含量计),比如5-20wt-%微原纤化纤维素和/或纳米晶纤维素。
在固化后,第一层的厚度为优选0.2-20μm,最优选0.5-10μm。第一层可覆盖整个基材或基材的一部分。例如,第一层可以点的形式提供,覆盖例如基材的表面的10至90%的范围内,比如基材的表面的30至70%。
步骤d)中的辐射固化使用本领域中已知的方法进行,比如UV固化或电子束固化。当使用UV固化时,丙烯酸类单体溶液还包含光引发剂,比如二苯甲酮或二甲基-N-氨基乙基甲基丙烯酸乙酯。典型地,辐射固化将表面上的活微生物数减少至少100倍,优选至少1000倍,更优选至少10000倍。
步骤d)可在基材的一侧或两侧进行。
在被提供有纳米涂层之后,基材的定量为优选小于100g/m2,更优选小于70g/m2且最优选小于35g/m2。在被提供有纳米涂层之后,所获得的基材的定量为优选至少10g/m2。
步骤d)中获得的涂覆的基材优选包含小于5个针孔/m2,优选小于3个针孔/m2,且更优选小于2个针孔/m2,根据标准EN13676:2001测量。KIT值为优选至少10,更优选至少11,最优选12。KIT值可使用本领域中已知的方法,比如TAPPI UM 557方法测定。
根据本发明的工艺的步骤e)涉及将丙烯酸类单体溶液的第二层添加至步骤d)中获得的经固化的第一层,接着辐射固化第二层。单体为优选以上对步骤d)示例的有机丙烯酸类单体。典型地,溶液不含任何溶剂。如果使用溶剂,溶剂优选是非水性的(不含水)
第二层的厚度为优选0.2-20μm,最优选0.5-10μm。
步骤e)中的辐射固化使用与步骤d)相同的方法进行。
如果必要,在步骤f)之前可重复步骤d)和/或e)。
根据本发明工艺的步骤d)和e)具有降低基材的表面粗糙度的效果并且使基材准备好进行后续纳米涂覆步骤,由此使得能够应用和使用非常薄的纳米涂层。更具体地,步骤d)和e)具有降低基材的纳米尺度表面粗糙度的效果。
基材的纳米尺度粗糙度可使用本领域中已知的方法测定。例如,粗糙度可通过原子力显微镜测定或通过使用扫描电子显微镜测定。
根据本发明的基材的纳米尺度表面粗糙度是低的,即表面在纳米尺度上是非常光滑的。粗糙度通常被描述为紧密间隔的不规则度。纳米尺度粗糙度可通过原子力显微镜测量。例如,步骤d)中获得的基材的区域(即在施加任何纳米涂层之前),优选5μm x 5μm和100μm x 100μm之间的区域,可使用原子力显微镜进行观察。表面结构,即峰和谷,可被测定并且可计算均方根(RMS)粗糙度或峰-对-谷高度参数,量化纳米尺度表面粗糙度(Peltonen J等,Langmuir,2004,20,9428-9431)。对于根据本发明步骤e)中获得的基材,相应地测定的RMS一般在100nm以下,优选在80nm以下。
纳米涂层非常薄,厚度0.1nm至约100nm。纳米涂层可为有机或无机的,比如陶瓷或金属纳米涂层。例如,金属化的表面使用非常少量的金属或金属氧化物,比如铝或TiO2,Al2O3,MgO或ZnO。在一个实施方式中,纳米涂层包含铝。
提供涂层的步骤(工艺的步骤f))可使用例如原子层沉积(ALD),动态复合沉积(DCD),化学气相沉积(CVD),比如等离子体CVD,物理气相沉积(PVD)和金属等离子体-沉积进行。纳米涂覆优选通过原子层沉积(ALD)进行。纳米涂覆可为在线(in-line,内联)工艺,即与步骤a)至e)中相同的设备和/或相同的位置进行。替代地,纳米涂覆可分开进行,即在与步骤a)至e)中分开的设备和/或另外的位置进行。纳米涂覆可在基材的一侧或两侧上进行。
在提供纳米涂层后,可任选地在纳米涂层上施加粘合剂、清漆或连接层形式的保护涂层。粘合剂的实例包括微原纤化纤维素,SB胶乳,SA胶乳,PVAc胶乳,淀粉,羧甲基纤维素,聚乙烯醇等。保护涂层中使用的粘合剂的量典型地为1-40g/m2,优选1-20g/m2或1-10g/m2。这样的保护涂层可使用本领域中已知的方法提供。例如,保护涂层可用例如接触或非接触沉积技术以一层或两层施加。所述保护涂层可进一步提供例如热密封性,液体耐受性和/或油脂耐受性,印刷表面和耐摩擦性。
根据本发明的进一步的实施方式,提供包含根据本发明制备的纳米涂覆的基材的层压物。这样的层压物可包含热塑性聚合物(基于化石的或由可再生资源制造的)层,比如聚乙烯、聚乙烯醇、EVOH、淀粉(包括改性淀粉)、纤维素衍生物(甲基纤维素、羟丙基纤维素等)、半纤维素、蛋白质、苯乙烯/丁二烯、苯乙烯/丙烯酸酯、丙烯酰基/乙烯基乙酸酯(acryl/vinylacetate)、聚丙烯、聚对苯二甲酸乙二酯、聚呋喃二甲酸乙二酯、PVDC、PCL、PHB和聚乳酸中的任一种。热塑性聚合物层可例如通过挤出涂覆、膜涂覆或分散体涂覆提供。该层压物结构可提供甚至更优越的阻隔性质并且可为可生物降解的和/或可堆肥的和/或可再制浆的。在一个实施方式中,根据本发明的纳米涂覆的基材可存在于两个图层之间,比如两层聚乙烯之间,在存在或不存在连接层的情况下。根据本发明的一个实施方式,聚乙烯可为高密度聚乙烯和低密度聚乙烯或其混合物或本领域技术人员可易于选择的变体中的至少一种。根据进一步的实施方式,提供根据本发明的纳米涂覆的基材或层压物,其中所述纳米涂覆的基材或所述层压物施加至纸制品和板中任一种的表面。纳米涂覆的基材或层压物也可为柔性包装材料的一部分,比如自立式袋或包。纳米涂覆的基材或层压物可并入到任意类型的包装(比如盒,包,包装膜,杯,容器,托盘,瓶等)中。
本发明的一个实施方式为根据本发明的工艺生产的纳米涂覆的基材。
纳米涂覆的基材在10-50g/m2的克重下在50% RH,23℃下测量的OTR(透氧率)值(在标准条件下测量)为优选<5cc/(m2*天),优选<3,更优选<2且最优选<1。
纳米涂覆的基材根据标准ISO 15106-2/ASTM F1249在50%相对湿度和23℃下测定的水蒸气透过率(WVTR)小于5g/m2/天,更优选小于3g/m2/天。
可根据需要的性质来选择纳米涂覆的基材的厚度。厚度可例如为10-100μm,比如20-50或30-40μm,具有例如10-100g/m2,比如20-30g/m2的克重。纳米涂覆的基材典型地具有非常良好的阻隔性质(例如对气体、脂肪或油脂、气味、光等的阻隔性质)。
本发明的进一步的实施方式为包含根据本发明的工艺生产的纳米涂覆的基材的产品。典型地,根据本发明的纳米涂覆的基材是可再制浆的。
本发明的一个实施方式是柔性包装,其包含根据本发明的工艺生产的纳米涂覆的基材。本发明的进一步的实施方式为刚性包装,其包含根据本发明的纳米涂覆的基材。
微原纤化纤维素(MFC)在本专利申请的上下文中是指至少一个维度小于100nm的纳米尺度的纤维素颗粒纤维或纤丝。MFC包含部分或全部原纤化的纤维素或木质纤维素纤维。被释放的纤丝的直径小于100nm,而实际的纤丝直径或粒径分布和/或纵横比(长度/宽度)取决于来源和制造方法。
最小的纤丝被称为基元纤丝且直径为约2-4nm(见例如Chinga-Carrasco,G.,Cellulose fibres,nanofibrils and microfibrils,:The morphological sequence ofMFC components from a plant physiology and fibre technology point of view,Nanoscale research letters 2011,6:417),同时常见的是基元纤丝的聚集形式,也定义为微纤丝(Fengel,D.,Ultrastructural behavior of cell wall polysaccharides,Tappi J.,March 1970,Vol 53,No.3.),是当通过使用延长精磨方法或压降解离方法制造MFC时得到的主产物。取决于来源和制造方法,纤丝的长度可在约1微米至大于10微米变化。粗MFC级(grade)可能含有显著分数的原纤化的纤维,即从管胞(纤维素纤维)突出的纤丝,和一定量的从管胞(纤维素纤维)释放出的纤丝。
MFC存在不同的缩写,比如纤维素微原纤丝、原纤化纤维素、纳米原纤化纤维素、原纤丝聚集物、纳米尺度纤维素纤丝、纤维素纳米纤维、纤维素纳米纤丝、纤维素微纤维、纤维素纤丝、微原纤状纤维素、微纤丝聚集物和纤维素微纤丝聚集物。MFC的特征还在于各种物理或物理化学性质,比如高表面积或其在分散在水中时在低固体物条件下(1-5重量%)形成凝胶状材料的能力。优选将纤维素纤维原纤化至这样的程度,微原纤化纤维素的比表面积为至少30m2/g,或更优选大于60m2/g或最优选>90m2/g,当根据氮吸附(BET)方法对于经溶剂交换和冷冻干燥的样品测定时。
存在多种制造MFC的方法,比如单次或多次精磨、预水解后接纤丝的精磨或高剪切解离或释放。通常需要一个或多个预处理步骤以便使得MFC制造能量有效且为可持续的。因此,可将待提供的浆的纤维素纤维用酶或化学方式预处理,例如以减少半纤维素或木质素的量。在原纤化之前可将纤维素纤维化学改性,其中纤维素纤维含有不同于(或多于)原始纤维素中存在的官能团。这样的基团包括羧甲基(CM)、醛基和/或羧基(通过N-氧基介导的氧化(例如“TEMPO”)获得的纤维素)、或季铵(阳离子纤维素)。在用上述方法之一改性或氧化之后,更容易将纤维解离成为MFC或纳米原纤状尺寸纤丝。
纳米原纤状纤维素可含有一些半纤维素;该量取决于植物来源。经预处理的纤维(例如经水解、预溶胀、或氧化的纤维素原材料)的机械解离,用合适的设备进行,比如精磨机、研磨机、均质机、胶体排除装置(colloider)、摩擦研磨机、超声超声波仪、流化器比如微流化器、宏观(大型)流化器或流化器型均质机。取决于MFC制造方法,产物还可能含有细料(fines)、或纳米结晶纤维素,或例如存在于木纤维或造纸方法中的其他化学品。产物还可能含有各种量的未被有效原纤化的微米尺寸的纤维颗粒。
从木纤维素纤维(从阔叶木或针叶木纤维两者)生产MFC。其还可由微生物来源、农业纤维例如麦草浆、竹子、甘蔗渣或其他非木纤维来源制得。其优选从包括来自原生纤维的浆(例如机械、化学和/或热机械浆)的浆制得。其还可从损纸或再生纸制得。
实施例
对比实施例1(未涂覆的薄基材)
基材为由具有约90°的SR值的纤维-MFC配料制备的32g/m2基材。
基材的Gurley-Hill值为约35 000s/100ml。
基材不具有气体或水蒸气阻隔性质。OTR和WVTR不可测量。
实施例1
使用用于将基于丙烯酸酯的UV清漆施加到以上的基材上的IGT装置进行实验室桌面研究,该基材略微更加多孔(Gurley Hill约10 000s/100ml)。网纹辊(anilox)体积为16ml/m2。
(印刷/涂覆条件:网纹辊150N,印刷150N,速度0,3m/s以及一个印刷水平)。观察到没有收缩或运行性(runnability,走纸性)问题。
在23C/50% RH下对样品测定的WVTR为84g/m2/天。
实施例2
在印刷机(柔性版印刷)中使用来自对比实施例1的基底。网纹辊格(cell)体积为15ml/m2并且速度为15m/min。
所施加的清漆为基于丙烯酸酯的UV清漆。印刷版设计为在基材上提供完全覆盖。假设网纹辊格体积的约30-40%被转移至基材。
使用5个UV灯用于固化。所获得的WVTR为94g/m2/天(从清漆侧测量),而OTR为1275cc/m2/天。
实施例3
与实施例2类似,但两侧都用以上描述的设定印刷。所获得的WVTR为65g/m2/天,而OTR为2.8cc/m2/天。
这些结果因此证实了含有大量的MFC(其通常对水非常敏感)的薄幅材可用不含水的涂料涂覆而不存在运行性(走纸性)问题。
这还意味着表面是封闭的且将是非常光滑的以及适合用于纳米涂覆,这将提供高阻隔性能(OTR<5且WVTR<5)。还预计该结构体可在纳米涂覆前在一侧或两侧上印刷。还明显的是这些样品具有良好的油脂耐受性。
实施例4
在两侧上UV印刷32g/m2基底幅材,其包含大量的具有略较高的Gurley Hill值(35000s/100ml)的MFC(如以上)。所获得的KIT值为12并且OTR<6以及WVTR为67g/m2/天。
鉴于本发明的上述详细描述,其他修改和变化对于本领域技术人员将变得显而易见。然而,应当清楚的是,在不脱离本发明的精神和范围的情况下,可以进行这样的其他修改和变化。
Claims (11)
1.生产纳米涂覆的基材的工艺,包括以下步骤:
a)提供包含浆的悬浮体,所述浆具有至少70°的Schopper Riegler值;
b)使用步骤a)的悬浮体以形成湿幅材;
c)将湿幅材脱水和/或干燥以形成基材;
d)将包含小于2wt-%水的丙烯酸类单体溶液的第一层添加至基材的表面,接着辐射固化第一层;
e)任选地将包含丙烯酸类单体溶液的第二层添加至经固化的第一层的表面并且辐射固化第二层;
f)在经固化的第一层或第二层的表面上提供纳米涂层使得在基材上提供具有在0.1nm至100nm的范围内的厚度的纳米涂层。
2.根据权利要求1所述的工艺,其中步骤d)和/或步骤e)中使用的单体为有机丙烯酸类单体。
3.根据权利要求1或2所述的工艺,其中步骤c)中获得的基材的Gurley Hill孔隙率值大于4000s/100ml。
4.根据权利要求1-3中任一项所述的工艺,其中步骤a)中的悬浮体包含微原纤化纤维素。
5.根据权利要求4所述的工艺,其中步骤a)中的悬浮体的微原纤化纤维素的含量为至少60重量%,基于悬浮体的固体物的重量计。
6.根据权利要求1-5中任一项所述的工艺,其中步骤d)中的辐射固化为电子束固化。
7.根据权利要求1-6中任一项所述的工艺,其中步骤e)中施加的纳米涂层包含铝。
8.根据权利要求1-7中任一项所述的工艺,其中步骤e)通过原子层沉积进行。
9.能够根据权利要求1-8中任一项的工艺获得的纳米涂覆的基材。
10.纳米涂覆的基于浆的基材,其涂覆有已经固化的丙烯酸类单体溶液的第一层和任选的已经在第一经固化的层的表面上固化的丙烯酸类单体溶液的第二层,并且具有在经固化的第一层或第二层的表面上的纳米涂层,使得纳米涂层具有在0.1nm至100nm的范围内的厚度。
11.包装材料,包含根据权利要求9或10所述的纳米涂覆的基材。
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PCT/IB2021/053829 WO2021224838A1 (en) | 2020-05-07 | 2021-05-06 | Process for production of nano-coated substrate |
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EP (1) | EP4146865A4 (zh) |
JP (1) | JP2023524280A (zh) |
CN (1) | CN115516167A (zh) |
CA (1) | CA3179407A1 (zh) |
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SE544690C2 (en) * | 2020-05-07 | 2022-10-18 | Stora Enso Oyj | Process for production of nano-coated substrate |
EP4180572A1 (en) * | 2021-11-15 | 2023-05-17 | Klabin S.A. | Barrier-coated cellulose-based substrate |
SE545928C2 (en) * | 2022-07-08 | 2024-03-19 | Stora Enso Oyj | A method for producing a barrier substrate comprising a microfibrillated cellulose film and a polymer film |
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EP4146865A4 (en) | 2024-05-15 |
EP4146865A1 (en) | 2023-03-15 |
CA3179407A1 (en) | 2021-11-11 |
WO2021224838A1 (en) | 2021-11-11 |
US20230132010A1 (en) | 2023-04-27 |
SE544690C2 (en) | 2022-10-18 |
SE2050523A1 (en) | 2021-11-08 |
JP2023524280A (ja) | 2023-06-09 |
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