CN105887556B - 一种提高加填纸张强度性能的方法 - Google Patents
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Abstract
本发明公开了一种改善硅酸钙加填纸张性能的方法,本发明采用磷酸对硅酸钙填料进行预处理,将处理后的填料加入磨浆后的植物纤维中,经过上网、成形、压榨、干燥后得到加填纸张。该方法可显著改善硅酸钙加填纸的强度性能,在开发高填料纸方面具有显著优势。
Description
技术领域
本发明属于造纸领域,具体涉及一种提高加填纸张强度性能的方法。
背景技术
在造纸过程中添加填料一方面可有效改善成纸光学性能与印刷适性,另一方面,由于填料成本低于纤维,使用填料还有利于降低生产成本。因此,提高纸张中的填料含量成为造纸工业追求的目标之一。然而,加入填料后会降低纸张强度性能,从而引起纸张表面掉毛掉粉、生产过程断纸的问题,因此现有文献采用对填料进行预处理,以改善加填纸张的强度性能。
这些预处理方法包括采用淀粉、壳聚糖等含有羟基的高分子材料对填料表面包覆或者采用高分子聚合物对填料进行预絮聚等方法,但这些方法都存在预处理过程繁杂,预处理后的填料性能不稳定等问题。
发明内容
本发明的目的在于提供一种提高加填纸张强度性能的方法,以克服上述现有技术存在的缺陷,本发明方法具有简单,预处理后填料稳定性好的特点,同时可显著改善纸张的强度性能。
为达到上述目的,本发明采用如下技术方案:
一种提高加填纸张强度性能的方法,包括以下步骤:
步骤一:将化学针叶木浆与化学阔叶木浆分别进行碎解后,加水稀释后将化学针叶木浆与化学阔叶木浆配比进行磨浆,磨浆完成后,将磨后的纸浆加水稀释,得到稀释浆料;
步骤二:将硅酸钙填料配置成填料悬浮液,对其进行预处理:搅拌的同时向填料悬浮液中逐渐加入质量浓度为10%~60%的磷酸溶液,使填料悬浮液的pH=4~6,得到预处理过的填料悬浮液;
步骤三:向稀释浆料中加入预处理过的填料悬浮液,并混合均匀形成抄纸纸料;将助留剂加入抄纸纸料中,与抄纸纸料充分混合后上网成形,进行抄纸。
进一步地,步骤一中将化学针叶木浆与化学阔叶木浆分别进行碎解后,加水稀释并使浆料质量浓度均为10%,然后按照化学针叶木浆:化学阔叶木浆质量比为1:4进行磨浆,磨浆完成后,将磨后的纸浆加水稀释至质量浓度为0.1%~0.3%,得到稀释浆料。
进一步地,步骤一中化学针叶木和化学阔叶木混合磨浆后的打浆度为30°SR~45°SR。
进一步地,步骤二中的硅酸钙填料平均粒径为10~30μm,白度为85%ISO~95%ISO。
进一步地,步骤二中将硅酸钙填料配置成质量分数为5~15%的填料悬浮液。
进一步地,步骤二中对填料悬浮液预处理时搅拌速度为500~800r/min。
进一步地,步骤三中填料悬浮液的加入量为稀释浆料中绝干量的20%~50%。
进一步地,步骤三中的助留剂为阳离子聚丙烯酰胺,其加入量为0.3千克/吨纸~0.5千克/吨纸。
进一步地,步骤三中将助留剂加入抄纸纸料中,与抄纸纸料充分混合20~40s后上网成形,进行抄纸。
与现有技术相比,本发明具有以下有益的技术效果:
本发明通过采用磷酸对硅酸钙预处理后,在酸性条件下可激发硅酸钙表面产生大量硅羟基,使其与纤维表面羟基形成化学结合,提高加填纸张强度性能;该方法工艺简单,高效,经预处理后的硅酸钙产品质量稳定,符合高填料造纸的要求,实验结果表明,在相同纸张定量、抄造工艺条和填料含量条件下,经过磷酸预处理的硅酸钙填料加填纸抗张强度和撕裂强度性能优于未处理的硅酸钙填料加填纸的强度性能,抗张强度性能的提高表明对填料进行预处理后改善了填料与纤维的结合力,意味着有进一步提高填料含量的空间,有利于开发高填料纸。该方法工艺简单,高效,经预处理后的硅酸钙产品质量稳定,符合高填料造纸的要求。
具体实施方式
下面结合实施例对本发明做进一步详细描述:
实施例1
1)将化学针叶木浆与化学阔叶木浆分别进行碎解,加水稀释并使浆料质量浓度为10%,而后按照针叶木:阔叶木质量比为1:4进行磨浆至打浆度为30°SR,磨浆完成后,将磨后的纸浆加水稀释至质量浓度为0.1%;
2)将硅酸钙填料配置成质量分数为15%的填料悬浮液,采用搅拌器以500r/min速度进行搅拌,向填料悬浮液中逐渐加入质量浓度为10%的磷酸溶液,使填料悬浮液由原始pH=8~9下降至pH为4.0;
3)向磨后纸浆中加入绝干量(相对于磨后纸浆质量)20%的预处理过的填料悬浮液,并混合均匀形成抄纸纸料;将助留剂阳离子聚丙烯酰胺按0.3千克/吨纸的用量加入纸料中,与纸料充分混合20s后上网成形,进行抄纸,纸张物理性能检测结果见表1。
表1 实施例1纸张物理性能检测结果
实施例2
1)将化学针叶木浆与化学阔叶木浆分别进行碎解,加水稀释并使浆料质量浓度为10%,而后按照针叶木:阔叶木质量比为1:4进行磨浆至打浆度为40°SR,磨浆完成后,将磨后的纸浆加水稀释至质量浓度为0.25%;
2)将硅酸钙填料配置成质量分数为10%的填料悬浮液,采用搅拌器以650r/min速度进行搅拌,向填料悬浮液中逐渐加入质量浓度为30%的磷酸溶液,使填料悬浮液由原始pH=8~9下降至pH为5.4;
3)向磨后纸浆中加入绝干量(相对于磨后纸浆质量)30%的预处理过的填料悬浮液,并混合均匀形成抄纸纸料;将助留剂阳离子聚丙烯酰胺按0.4千克/吨纸的用量加入纸料中,与纸料充分混合30s后上网成形,进行抄纸,纸张物理性能检测结果见表2。
表2 实施例2纸张物理性能检测结果
实施例3
1)将化学针叶木浆与化学阔叶木浆分别进行碎解,加水稀释并使浆料质量浓度为10%,而后按照针叶木:阔叶木质量比为1:4进行磨浆至打浆度为45°SR,磨浆完成后,将磨后的纸浆加水稀释至质量浓度为0.3%;
2)将硅酸钙填料配置成质量分数为5%的填料悬浮液,采用搅拌器以800r/min速度进行搅拌,向填料悬浮液中逐渐加入质量浓度为60%的磷酸溶液,使填料悬浮液由原始pH=8~9下降至pH为6.0;
3)向磨后纸浆中加入绝干量(相对于磨后纸浆质量)50%的预处理过的填料悬浮液,并混合均匀形成抄纸纸料;将助留剂阳离子聚丙烯酰胺按0.5千克/吨纸的用量加入纸料中,与纸料充分混合40s后上网成形,进行抄纸,纸张物理性能检测结果见表3。
表3 实施例3纸张物理性能检测结果
以上结果表明,在相同纸张定量、抄造工艺条和填料含量条件下,经过磷酸溶液预处理的硅酸钙填料加填纸抗张强度和撕裂强度性能优于未处理的硅酸钙填料加填纸的强度性能,抗张强度性能的提高表明对填料进行预处理后改善了填料与纤维的结合力,意味着有进一步提高填料含量的空间,有利于开发高填料纸。
Claims (5)
1.一种提高加填纸张强度性能的方法,其特征在于,包括以下步骤:
步骤一:将化学针叶木浆与化学阔叶木浆分别进行碎解后,加水稀释并使浆料质量浓度均为10%,然后按照化学针叶木浆:化学阔叶木浆质量比为1:4进行磨浆,磨浆完成后,打浆度为30°SR~45°SR,将磨后的纸浆加水稀释至质量浓度为0.1%~0.3%,得到稀释浆料;
步骤二:将硅酸钙填料配置成质量分数为5~15%的填料悬浮液,对其进行预处理:搅拌的同时向填料悬浮液中逐渐加入质量浓度为10%~60%的磷酸溶液,使填料悬浮液的pH=4~6,得到预处理过的填料悬浮液;
步骤三:向稀释浆料中加入预处理过的填料悬浮液,填料悬浮液的加入量为稀释浆料中绝干量的20%~50%,并混合均匀形成抄纸纸料;将助留剂加入抄纸纸料中,与抄纸纸料充分混合后上网成形,进行抄纸。
2.根据权利要求1所述的一种提高加填纸张强度性能的方法,其特征在于,步骤二中的硅酸钙填料平均粒径为10~30μm,白度为85%ISO~95%ISO。
3.根据权利要求1所述的一种提高加填纸张强度性能的方法,其特征在于,步骤二中对填料悬浮液预处理时搅拌速度为500~800r/min。
4.根据权利要求1所述的一种提高加填纸张强度性能的方法,其特征在于,步骤三中的助留剂为阳离子聚丙烯酰胺,其加入量为0.3千克/吨纸~0.5千克/吨纸。
5.根据权利要求1所述的一种提高加填纸张强度性能的方法,其特征在于,步骤三中将助留剂加入抄纸纸料中,与抄纸纸料充分混合20~40s后上网成形,进行抄纸。
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CN103306159B (zh) * | 2013-05-20 | 2015-07-29 | 陕西科技大学 | 一种改性硅酸钙造纸填料的制备方法 |
CN103938488B (zh) * | 2014-04-29 | 2016-05-18 | 陕西科技大学 | 一种多孔硅酸钙/纤维共磨加填纸的制备方法 |
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