CN110565431A - 一种尺寸稳定且恢复性优良的特种纸及其制备方法 - Google Patents
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Abstract
本发明涉及尺寸稳定且恢复性优良的纸及其制备方法，纸张包括木浆纤维60‑80、矿物填料3‑5、润湿剂3‑5、消泡剂2‑5，其特征在于，还包括氨基硅烷5‑10、糖醇5‑10。通过在纸浆中添加氨基硅烷和糖醇，可以赋予纸张在纸张所在平面上的X、Y两个方向上一定的微弹性，这一微弹性可以有效缓解纸张在遇水或潮湿环境中的膨胀变形，同时，还可以缓解纸张被再次干燥而脱水后，纸张因膨胀变形而产生的起泡、褶皱形状，改善纸张的恢复性。
Description
技术领域
本发明涉及尺寸稳定且恢复性优良的特种纸及其制备方法，属于造纸领域，可以应用于壁纸。
背景技术
普通纸张遇水会因为纤维素的溶胀而膨胀变形，在潮湿环境中也会因为纤维素对水分的逐渐吸收而膨胀变形。对于应用到壁纸的纸张，通常需要其具有良好的尺寸稳定性，即便遇水或潮湿空气，也不会产生太大的膨胀变形。
现有技术中通常采用的方法是在壁纸上设置防水层，例如PVC防水层，以隔绝纸张与水或潮湿空气的接触。这种方法会增加多余的工序，复杂繁琐，成本高。
现有技术中还有通过将纸张浸渍在特殊混合物中进行表面改性，增加纸张尺寸稳定性。如，WO2014/006268中就通过将纸张浸渍在糖醇、脲、聚亚烷基二醇和/甘油组成的混合物中，可以将纸张的湿膨胀率明显降低，纸张的尺寸稳定性提高50%以上。
虽然纸张的尺寸稳定性得到了改善，但是，由于纸张的膨胀变形通常在局部区域产生起泡、褶皱，当纸张被再次干燥而脱水后，纸张仍然保持因膨胀变形而产生的起泡、褶皱形状，无法恢复到原有的平整形状，或者起泡、褶皱等变形形状无法得到改善，使得在壁纸表面的平整度、美观等变差。因此，本发明的一个目的在提供一种尺寸稳定且恢复性良好的纸。
发明内容
为了解决上述技术问题，本发明提供一种尺寸稳定且恢复性良好的纸，利用氨基硅烷类偶联剂的偶联特性，同时，氨基硅烷水解后得到硅醇，与糖醇表面的羟基结合进而脱水，可以与糖醇接合起来，氨基硅烷中的氨基与木浆纤维中的纤维素键合，可以提升纸张中纤维素之间的交联稳定性，同时，还可以赋予纸张在纸张所在平面上的X、Y两个方向上一定的微弹性，这一微弹性可以有效缓解纸张在遇水或潮湿环境中的膨胀变形，同时，还可以缓解纸张被再次干燥而脱水后，纸张因膨胀变形而产生的起泡、褶皱形状，改善纸张的恢复性。
一种尺寸稳定且恢复性良好的纸，按质量份数计，包括木浆纤维60-80、矿物填料3-5、润湿剂3-5、消泡剂2-5，其特征在于，还包括氨基硅烷5-10、糖醇5-10。
其中，糖醇的通式为HOCH2[CH(OH)]nCH2OH，其中，n=2、3、4、5。
其中，木浆纤维包括针叶浆和阔叶浆，优选针叶浆与阔叶浆的质量比为40-60:60-40。
其中，氨基硅烷选自γ-氨丙基三甲氧基硅烷、γ-氨丙基三乙氧基硅烷、N-β(氨乙基)-γ-氨丙基三甲氧基硅烷、N-β(氨乙基)-γ-氨丙基甲基二甲氧基硅烷、N-β(氨乙基)-γ-氨丙基三乙氧基硅烷、N-β(氨乙基)-γ-氨丙基甲基二乙氧基硅烷中的一种或多种。优选为γ-氨丙基三甲氧基硅烷、γ-氨丙基三乙氧基硅烷。
一种尺寸稳定且恢复性良好的纸的制备方法，按照上述配方取木浆纤维、矿物填料、润湿剂、消泡剂、氨基硅烷、糖醇加入碎浆机中碎浆，然后磨浆，经抄造、上网、压榨、烘干、压光、卷纸、裁切和包装即可。
本发明通过在纸浆中添加氨基硅烷和糖醇，利用氨基硅烷自身的偶联特性，可以将纤维素、淀粉的高分子化合物偶联在一起，特别是氨基硅烷水解后得到硅醇，与糖醇表面的羟基结合进而脱水，可以与糖醇接合起来，氨基硅烷中的氨基与木浆纤维中的纤维素键合，可以提升纸张中纤维素之间的交联稳定性，同时，还可以赋予纸张在纸张所在平面上的X、Y两个方向上一定的微弹性，这一微弹性可以有效缓解纸张在遇水或潮湿环境中的膨胀变形，同时，还可以缓解纸张被再次干燥而脱水后，纸张因膨胀变形而产生的起泡、褶皱形状，改善纸张的恢复性。
具体实施方式
为了更好的展现本发明的技术效果，以下结合较佳的实施例以及对应的对比例进行详细阐述和说明。
实施例1
纸张按质量份数计，包括木浆纤维60、矿物填料3、润湿剂3、消泡剂2，其特征在于，还包括氨基硅烷5、糖醇5。
糖醇的通式为HOCH2[CH(OH)]3CH2OH
木浆纤维包括针叶浆和阔叶浆，针叶浆与阔叶浆的质量比为50:50。
氨基硅烷为γ-氨丙基三甲氧基硅烷。
制备方法为，按照上述配方取木浆纤维、矿物填料、润湿剂、消泡剂、氨基硅烷、糖醇加入碎浆机中碎浆，然后磨浆，经抄造、上网、压榨、烘干、压光、卷纸、裁切和包装即可。
实施例2
纸张按质量份数计，包括木浆纤维70、矿物填料4、润湿剂4、消泡剂4，其特征在于，还包括氨基硅烷8、糖醇8。
糖醇的通式为HOCH2[CH(OH)]4CH2OH
木浆纤维包括针叶浆和阔叶浆，针叶浆与阔叶浆的质量比为40:60。
氨基硅烷为γ-氨丙基三乙氧基硅烷。
制备方法为，按照上述配方取木浆纤维、矿物填料、润湿剂、消泡剂、氨基硅烷、糖醇加入碎浆机中碎浆，然后磨浆，经抄造、上网、压榨、烘干、压光、卷纸、裁切和包装即可。
实施例3
纸张按质量份数计，包括木浆纤维80、矿物填料5、润湿剂5、消泡剂5，其特征在于，还包括氨基硅烷10、糖醇10。
糖醇的通式为HOCH2[CH(OH)]5CH2OH
木浆纤维包括针叶浆和阔叶浆，针叶浆与阔叶浆的质量比为60:40。
氨基硅烷为N-β(氨乙基)-γ-氨丙基三甲氧基硅烷。
制备方法为，按照上述配方取木浆纤维、矿物填料、润湿剂、消泡剂、氨基硅烷、糖醇加入碎浆机中碎浆，然后磨浆，经抄造、上网、压榨、烘干、压光、卷纸、裁切和包装即可。
对比例1
相较于实施例1，区别在于不添加氨基硅烷和糖醇，其余相同。
对比例2
相较于实施例1，区别在于不添加氨基硅烷，其余相同。
对比例3
相较于实施例1，区别在于不添加糖醇，其余相同。
为了测试所制备的纸张的尺寸稳定性和恢复性，参考WO2014/006268中所使用的方法，选取实施例1-3和对比例1-3所制备的纸张，在距离边缘位置50mm处裁切200×50的长条纸张，将其浸入去离子水中，带完全润湿后，取出长条纸张，测量其长度，然后将其干燥后再测量其长度，并观察表面褶皱和起泡情况。以浸渍前后的长度差值的百分数作为湿膨胀变形率，以再次干燥后的长度与最初的长度的比值作为恢复率，结果见表1
| 湿膨胀变形率 | 恢复率 | 干燥后褶皱、起泡情况 | |
| 实施例1 | 0.8% | 100.4% | 无明显褶皱、边缘区域存在少量起泡现象 |
| 实施例2 | 0.9% | 100.5 | 无明显褶皱、边缘区域存在少量起泡现象 |
| 实施例3 | 1.0% | 100.5% | 无明显褶皱、边缘区域存在少量起泡现象 |
| 对比例1 | 2.6% | 102.4% | 存在较多褶皱、边缘和中间区域均有起泡现象 |
| 对比例2 | 2.4% | 102.2% | 存在少量褶皱、边缘和中间区域均有起泡现象 |
| 对比例3 | 1.8% | 101.6% | 存在少量褶皱、边缘和中间区域均有起泡现象 |
从上表中可以看出，在纸浆中添加氨基硅烷和糖醇，可以明显改善制得纸张的尺寸稳定性，且纸张的恢复率也更接近100%，恢复性良好。
Claims (6)
1.一种尺寸稳定且恢复性良好的纸，按质量份数计，包括木浆纤维60-80、矿物填料3-5、润湿剂3-5、消泡剂2-5，其特征在于，还包括氨基硅烷5-10、糖醇5-10。
2.根据权利要求1所述的一种尺寸稳定且恢复性良好的纸，其特征在于：糖醇的通式为HOCH2[CH(OH)]nCH2OH，其中，n=2、3、4、5。
3.根据权利要求1所述的一种尺寸稳定且恢复性良好的纸，其特征在于：木浆纤维包括针叶浆和阔叶浆，针叶浆与阔叶浆的质量比为40-60:60-40。
4.根据权利要求1所述的一种尺寸稳定且恢复性良好的纸，其特征在于：氨基硅烷选自γ-氨丙基三甲氧基硅烷、γ-氨丙基三乙氧基硅烷、N-β(氨乙基)-γ-氨丙基三甲氧基硅烷、N-β(氨乙基)-γ-氨丙基甲基二甲氧基硅烷、N-β(氨乙基)-γ-氨丙基三乙氧基硅烷、N-β(氨乙基)-γ-氨丙基甲基二乙氧基硅烷中的一种或多种。
5.根据权利要求1所述的一种尺寸稳定且恢复性良好的纸，其特征在于：氨基硅烷为γ-氨丙基三甲氧基硅烷或γ-氨丙基三乙氧基硅烷。
6.如权利要求1所述的一种尺寸稳定且恢复性良好的纸的制备方法，按照配方取木浆纤维、矿物填料、润湿剂、消泡剂、氨基硅烷、糖醇加入碎浆机中碎浆，然后磨浆，经抄造、上网、压榨、烘干、压光、卷纸、裁切和包装即可。
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