CN108978345A - 一种无透明点格拉辛纸的生产方法 - Google Patents
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Abstract
一种无透明点格拉辛纸的生产方法,它包括以下步骤:a.将针叶木浆和阔叶木浆按照比例进行配浆;b.称取锂皂石分散于去离子水中,得锂皂石溶胶,将碳量子点加入到锂皂石溶胶中,混合均匀,得碳量子点/锂皂石稳定体系;将上述制备的碳量子点/锂皂石稳定体系加入AKD溶液中,然后搅拌乳化,制得水包油型液体具有荧光性AKD Pickering乳液;以AKD Pickering乳液作为浆内施胶剂对纸页进行施胶;c.加入助留剂,经过网部脱水、压榨、前段干燥,再加入表面施胶剂PVA进行表面施胶,后段干燥,最后进行超压压光;它不仅可避免表面活性剂对水体和土壤造成的不良影响,降低生态环境压力,而且能显著改善纸张的透明点问题,提高纸张的质量。
Description
技术领域
本发明涉及的是一种无透明点格拉辛纸的制备方法,属于造纸技术领域。
背景技术
格拉辛纸是格拉辛专用原纸经涂布加工后制成的纸张,具有很好的内部强度和透明度。具有耐高温,防潮,防油等功能,主要用于:高速自动贴标、尤其适用高速标签粘贴的特殊胶带、双面胶带基材商标、激光防伪标和其他离型应用等。在医疗产品中主要用途是:作为胶带和敷料产品的离型纸。
传统格拉辛纸采用烷基烯酮二聚体(AKD)作为施胶剂提供抗水性能,但是AKD 易水解,成纸时容易出现“透明点”问题;而且在AKD施胶时,通常由表面活性剂充当乳化剂,表面活性剂尤其是合成表面活性剂的大量使用对水体和土壤造成了严重危害,同时不利于纸页施胶度的提高。而固体颗粒稳定的乳液,即Pickering乳液,则能避免表面活性剂的不利影响,吸附在油水界面上的固体颗粒形成稳定的界面膜,可有效阻止乳液的水解,提高乳液性能,可以有效解决格拉辛纸“透明点”问题。
碳量子点是由分散的类球状碳颗粒组成,尺寸极小(在10 nm 以下),具有荧光性质的新型纳米碳材料,通常由碳纳米材料剥离、碎解,或小分子碳源缩合、碳化形成, 表面可带有羧基、氨基等各种功能基团,具有优秀的光学性质,良好的水溶性、低毒性、环境友好、原料来源广、成本低、生物相容性好等诸多优点,将碳量子点与锂皂石复配,两者之间发生聚集作用,吸附在油水界面上形成稳定的界面膜,阻止乳液的水解,增加乳液的稳定性。
发明内容
本发明的目的在于克服现有技术存在的不足,而提供一种不仅可避免表面活性剂对水体和土壤造成的不良影响,降低生态环境压力,而且能显著改善纸张的透明点问题,提高纸张质量的无透明点格拉辛纸的生产方法。
本发明的目的是通过如下技术方案来完成的,一种无透明点格拉辛纸的生产方法,该生产方法包括以下步骤:
a.将针叶木浆和阔叶木浆按照质量比50~70:30~50比例进行配浆,浆料打浆后的打浆度:针叶木浆60~80°SR,阔叶木浆20~40°SR;
b.由碳量子点、锂皂石和AKD组成AKD Pickering乳液作为浆内施胶剂对纸页进行施胶。施胶量为1%-1.5%,碳量子点、锂皂石和AKD的质量比为1: 3-5:120,碳量子点直径为4-6nm;所述锂皂石直径约6-8μm,片厚约10-18nm;所述AKD粘度0.3-0.5 pa·s;
c.加入助留剂0.1%-0.5%,经过网部脱水、压榨、前段干燥,再加入表面施胶剂PVA进行表面施胶,施胶量为1-2g/m2、后段干燥,最后进行超压压光,纸张在进行超压压光时压力500-2000KN/m,辊面温度150-280℃。
作为优选:所述的步骤a中,所述针叶木浆与阔叶木浆的质量比为50:50,打浆后打浆度针叶木浆80°SR,阔叶木浆40°SR;
所述的步骤b中,所述碳量子点、锂皂石和AKD溶液的质量比为1:4:120;所述碳量子点为分散的类球状碳颗粒,直径为5 nm;所述锂皂石颗粒呈球粒状,厚度为15 nm,直径为7μm;所述AKD溶液粘度为0.4pa·s;所述AKD Pickering乳液进行浆内施胶的施胶量为1%。
所述的步骤c中,所述纸张在超压压光时压力为1000KN/m,辊面温度200℃。
作为优选:所述碳量子点通过如下制备方法得到:
将40ml 45mmol/Ld的葡萄糖溶液转移到不锈钢高压釜聚四氟乙烯(100ml)内胆中,分别在180℃反应28h。待溶液冷却到室温以后,用超声波震荡处理30min,再用0.22μm的滤膜过滤以除去大的颗粒,得到碳量子点,备用;
所述AKD Pickering乳液通过如下制备方法得到:
将锂皂石分散于去离子水中,得锂皂石溶胶,将碳量子点加入到锂皂石溶胶中,混合均匀,得碳量子点/锂皂石稳定体系;将上述制备的碳量子点/锂皂石稳定体系加入AKD溶液中,然后搅拌乳化,制得水包油型液体AKD Pickering乳液。
本发明所述的制备方法及所得到的产物具有以下优点:
(1)利用该乳液稳定体系制备的AKD Pickering乳液可避免表面活性剂对水体和土壤造成的不良影响,降低生态环境压力。
(2)利用该乳液稳定体系制备的AKD Pickering乳液具有荧光性能。
(3)利用该乳液对纸页进行浆内施胶,能显著改善纸张的“透明点”问题,提高纸张的质量。
本发明以碳量子点/锂皂石稳定体系制备AKD Pickering不仅可避免表面活性剂对水体和土壤造成的不良影响,降低生态环境压力;利用该乳液稳定体系制备的AKDPickering乳液具有荧光性能;利用该乳液对纸页进行浆内施胶,能显著改善纸张的透明点问题,提高纸张的质量。
具体实施方式
下面将结合具体实施例对本发明作详细的介绍:一种无透明点格拉辛纸的生产方法,该生产方法包括以下步骤:
a.将针叶木浆和阔叶木浆按照质量比50~70:30~50比例进行配浆,浆料打浆后的打浆度:针叶木浆60~80°SR,阔叶木浆20~40°SR;
b.由碳量子点、锂皂石和AKD组成AKD Pickering乳液作为浆内施胶剂对纸页进行施胶。施胶量为1%-1.5%,碳量子点、锂皂石和AKD的质量比为1: 3-5:120,碳量子点直径为4-6nm;所述锂皂石直径约6-8μm,片厚约10-18nm;所述AKD粘度0.3-0.5 pa·s;
c.加入助留剂0.1%-0.5%,经过网部脱水、压榨、前段干燥,再加入表面施胶剂PVA进行表面施胶,施胶量为1-2g/m2、后段干燥,最后进行超压压光,纸张在进行超压压光时压力500-2000KN/m,辊面温度150-280℃。
作为优选的实施例:本发明在上述公开实施例的基础上,进一步的是:
所述的步骤a中,所述针叶木浆与阔叶木浆的质量比为50:50,打浆后打浆度针叶木浆80°SR,阔叶木浆40°SR;
所述的步骤b中,所述碳量子点、锂皂石和AKD溶液的质量比为1:4:120;所述碳量子点为分散的类球状碳颗粒,直径为5 nm;所述锂皂石颗粒呈球粒状,厚度为15 nm,直径为7μm;所述AKD溶液粘度为0.4pa·s;所述AKD Pickering乳液进行浆内施胶的施胶量为1%。
所述的步骤c中,所述纸张在超压压光时压力为1000KN/m,辊面温度200℃。
本发明所述碳量子点通过如下制备方法得到:
将40ml 45mmol/Ld的葡萄糖溶液转移到不锈钢高压釜聚四氟乙烯(100ml)内胆中,分别在180℃反应28h。待溶液冷却到室温以后,用超声波震荡处理30min,再用0.22μm的滤膜过滤以除去大的颗粒,得到碳量子点,备用;
所述AKD Pickering乳液通过如下制备方法得到:
将锂皂石分散于去离子水中,得锂皂石溶胶,将碳量子点加入到锂皂石溶胶中,混合均匀,得碳量子点/锂皂石稳定体系;将上述制备的碳量子点/锂皂石稳定体系加入AKD溶液中,然后搅拌乳化,制得水包油型液体AKD Pickering乳液。
实施例1:a.将针叶木浆和阔叶木浆按照质量比70:30比例进行配浆,浆料打浆后的打浆度:针叶木浆60°SR,阔叶木浆30°SR;
b. 称取3g锂皂石(直径6μm, 厚10 nm)分散于100 g去离子水中,得锂皂石溶胶,将1 g碳量子点(直径4 nm)加入到锂皂石溶胶中,混合均匀,得碳量子点/锂皂石稳定体系;将上述制备的碳量子点/锂皂石稳定体系加入120g AKD(粘度0.3 Pa·S)溶液中,然后搅拌乳化,制得水包油型液体具有荧光性AKD Pickering乳液。以AKD Pickering乳液作为浆内施胶剂对纸页进行施胶(施胶量1.5%);
c. 加入助留剂(0.1%),经过网部脱水、压榨、前段干燥,再加入表面施胶剂PVA进行表面施胶,施胶量为1g/m2、后段干燥,最后进行超压压光,纸张在进行超压压光时压力800KN/m,辊面温度180℃。
实施例2:a.将针叶木浆和阔叶木浆按照质量比50:50比例进行配浆,浆料打浆后的打浆度:针叶木浆70,阔叶木浆20°SR;
b. 称取5g锂皂石(直径8μm, 厚18 nm)分散于100 g去离子水中,得锂皂石溶胶,将1 g碳量子点(直径6nm)加入到锂皂石溶胶中,混合均匀,得碳量子点/锂皂石稳定体系;将上述制备的碳量子点/锂皂石稳定体系加入120g AKD(粘度0.5Pa·S)溶液中,然后搅拌乳化,制得水包油型液体具有荧光性AKD Pickering乳液。以AKD Pickering乳液作为浆内施胶剂对纸页进行施胶(施胶量1.0 %);
c. 加入助留剂(0.5%),经过网部脱水、压榨、前段干燥,再加入表面施胶剂PVA进行表面施胶,施胶量为1.5g/m2、后段干燥,最后进行超压压光,纸张在进行超压压光时压力1500KN/m,辊面温度240℃。
实施例3:a.将针叶木浆和阔叶木浆按照质量比60:40比例进行配浆,浆料打浆后的打浆度:针叶木浆80,阔叶木浆40°SR;
b. 称取4g锂皂石(直径7μm, 厚15 nm)分散于100 g去离子水中,得锂皂石溶胶,将1 g碳量子点(直径5 nm)加入到锂皂石溶胶中,混合均匀,得碳量子点/锂皂石稳定体系;将上述制备的碳量子点/锂皂石稳定体系加入120g AKD(粘度0.4Pa·S)溶液中,然后搅拌乳化,制得水包油型液体具有荧光性AKD Pickering乳液。以AKD Pickering乳液作为浆内施胶剂对纸页进行施胶(施胶量1.0 %);
c. 加入助留剂(0.3%),经过网部脱水、压榨、前段干燥,再加入表面施胶剂PVA进行表面施胶,施胶量为2g/m2、后段干燥,最后进行超压压光,纸张在进行超压压光时压力1000KN/m,辊面温度200℃。
上述实施例为本发明较佳的实施方式,但本发明的实施方式并不受上述实施例的限制,其它的任何未背离本发明的精神实质与原理下所作的改变、修饰、替代、组合、简化,均应为等效的置换方式,都包含在本发明的保护范围之内。
Claims (3)
1.一种无透明点格拉辛纸的生产方法,特征在于:该生产方法包括以下步骤:
a.将针叶木浆和阔叶木浆按照质量比50~70:30~50比例进行配浆,浆料打浆后的打浆度:针叶木浆60~80°SR,阔叶木浆20~40°SR;
b.由碳量子点、锂皂石和AKD组成AKD Pickering乳液作为浆内施胶剂对纸页进行施胶;
施胶量为1%-1.5%,碳量子点、锂皂石和AKD的质量比为1: 3-5:120,碳量子点直径为4-6 nm;所述锂皂石直径约6-8μm,片厚约10-18nm;所述AKD粘度0.3-0.5 pa·s;
c.加入助留剂0.1%-0.5%,经过网部脱水、压榨、前段干燥,再加入表面施胶剂PVA进行表面施胶,施胶量为1-2g/m2、后段干燥,最后进行超压压光,纸张在进行超压压光时压力500-2000KN/m,辊面温度150-280℃。
2.根据权利要求1所述的无透明点格拉辛纸的生产方法,其特征在于:
所述的步骤a中,所述针叶木浆与阔叶木浆的质量比为50:50,打浆后打浆度针叶木浆80°SR,阔叶木浆40°SR;
所述的步骤b中,所述碳量子点、锂皂石和AKD溶液的质量比为1:4:120;所述碳量子点为分散的类球状碳颗粒,直径为5 nm;所述锂皂石颗粒呈球粒状,厚度为15 nm,直径为7μm;所述AKD溶液粘度为0.4pa·s;所述AKD Pickering乳液进行浆内施胶的施胶量为1%;
所述的步骤c中,所述纸张在超压压光时压力为1000KN/m,辊面温度200℃。
3.根据权利要求1所述的无透明点格拉辛纸的生产方法,其特征在于:所述碳量子点通过如下制备方法得到:
将40ml 45mmol/Ld的葡萄糖溶液转移到不锈钢高压釜聚四氟乙烯(100ml)内胆中,分别在180℃反应28h;
待溶液冷却到室温以后,用超声波震荡处理30min,再用0.22μm的滤膜过滤以除去大的颗粒,得到碳量子点,备用;
所述AKD Pickering乳液通过如下制备方法得到:
将锂皂石分散于去离子水中,得锂皂石溶胶,将碳量子点加入到锂皂石溶胶中,混合均匀,得碳量子点/锂皂石稳定体系;将上述制备的碳量子点/锂皂石稳定体系加入AKD溶液中,然后搅拌乳化,制得水包油型液体AKD Pickering乳液。
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