【技术领域】【Technical field】
本发明属于制浆造纸领域，具体涉及一种造纸工艺。The invention belongs to the field of pulping and papermaking, and in particular relates to a papermaking process.
【背景技术】【Background technique】
提高纸张中填料的含量，不仅有利于降低纸张的生产成本，提高企业利润，更有利于缓解造纸行业纤维原料资源紧缺的局面。但填料通常为无机矿物粉体，其微粒间或与纤维之间均不能产生化学键或氢键结合；同时，填料微粒的存在将通过位阻效应阻碍纸浆纤维间的氢键结合，因此，纸张中添加填料会导致纸张强度的损失，包括纸张物理强度和表面强度等，且填料含量越高，强度损失越大。纸张物理强度低，易导致纸张在生产及应用中易断裂、破损；表面强度降低易导致纸张产生掉毛掉粉现象，难以满足现代高速印刷的需要。因此，如何既能提高纸张的填料含量又能保护纸张的强度是摆在造纸科技人员面前的技术难题。同时，高填料含量纸张成形过程中填料的留着率低，随白水流失很大，如何提高填料的高留着也是实现纸张高加填的又一技术难题。Increasing the content of fillers in paper is not only beneficial to reduce the production cost of paper, improve corporate profits, but also help to alleviate the shortage of fiber raw material resources in the paper industry. However, the filler is usually an inorganic mineral powder, which cannot produce chemical bonds or hydrogen bonds between the particles or between the fibers; at the same time, the presence of the filler particles will hinder the hydrogen bond between the pulp fibers through the steric effect. Fillers will cause the loss of paper strength, including paper physical strength and surface strength, and the higher the filler content, the greater the strength loss. The low physical strength of the paper can easily cause the paper to be easily broken and damaged during production and application; the reduced surface strength can easily cause the paper to lint and powder, which is difficult to meet the needs of modern high-speed printing. Therefore, how to increase the filler content of paper and protect the strength of paper is a technical problem in front of paper-making technicians. At the same time, during the forming process of paper with high filler content, the retention rate of filler is low, and the loss with white water is large. How to improve the high retention of filler is another technical problem to realize high filling of paper.
【发明内容】【Content of invention】
本发明的目的在于提供一种微纤化纤维素包络助留高加填造纸工艺，提高纸张强度，实现纸张高加填和高强度共存。The purpose of the present invention is to provide a microfibrillated cellulose enveloping aid retention and high filling papermaking process, which improves the strength of paper and realizes the coexistence of high filling and high strength of paper.
为实现上述目的，本发明采用的技术方案为：To achieve the above object, the technical solution adopted in the present invention is:
一种微纤化纤维素包络助留高加填造纸工艺，包括以下步骤：A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:
1)首先，把工业微纤化纤维素产品加水稀释至质量百分比为1％～5％的浓度，然后在常温下进行超声波处理；1) First, dilute the industrial microfibrillated cellulose product with water to a concentration of 1% to 5% by mass, and then perform ultrasonic treatment at room temperature;
2)将步骤1)超声波处理后的微纤化纤维素浓缩至质量百分比为10％的浓度，采用PFI磨浆机进行细纤维化处理；2) concentrating the microfibrillated cellulose after the ultrasonic treatment in step 1) to a concentration of 10% by mass, and performing fine fiberization treatment with a PFI refiner;
3)将步骤2)细纤维化处理后的微纤化纤维素加水稀释为质量百分比为2％～8％的浓度，然后加入填料；再高剪切力混合均匀后静置形成填料/MFC预包络体分散系；其中，填料占填料/MFC预包络体分散系中总固形物质量百分比为70％～90％；3) Dilute the microfibrillated cellulose after the fibrillation treatment in step 2) with water to a concentration of 2% to 8% by mass, and then add fillers; mix them evenly under high shear force and let stand to form fillers/MFC pre- Envelope dispersion system; wherein, the filler accounts for 70% to 90% of the total solids in the filler/MFC pre-envelope dispersion system;
4)按填料/MFC预包络体分散系中固形物质量百分比0.02％～0.06％的量加入助留助滤剂阳离子聚丙烯酰胺，低剪切混合均匀后形成填料/MFC包络体分散系；4) Add the retention and drainage aid cationic polyacrylamide according to the solid matter percentage of 0.02% to 0.06% in the filler/MFC pre-envelope dispersion system, and form the filler/MFC inclusion body dispersion system after low-shear mixing. ;
5)将步骤4)中形成的填料/MFC包络体分散系加入化学浆纸浆中进行低剪切力混合均匀形成总分散系；其中，填料/MFC包络体分散系中固形物含量为总分散系中固形物总质量的45％～70％；然后迅速加入纸页成型器中进行抄造成形、干燥，得到微纤化纤维素包络助留的高加填纸张。5) Add the filler/MFC inclusion body dispersion system formed in step 4) to the chemical pulp and carry out low-shear force mixing to form a total dispersion system; wherein, the solid content in the filler/MFC inclusion body dispersion system is the total 45% to 70% of the total mass of solids in the dispersion system; then quickly put into a paper sheet forming machine for sheet forming and drying to obtain highly filled paper with microfibrillated cellulose enveloping and retaining aid.
优选的，步骤1)中超声波处理的参数为：超声波功率为300W，频率20 kHz，处理时间20～40min。Preferably, the parameters of the ultrasonic treatment in step 1) are: the ultrasonic power is 300W, the frequency is 20 kHz, and the treatment time is 20-40min.
优选的，步骤2)中，控制PFI磨浆机的处理转数为20000～60000转。Preferably, in step 2), the processing rotation number of the PFI refiner is controlled to be 20000-60000 rotations.
优选的，步骤3)中高剪切力混合均匀后静置1～5秒形成填料/MFC预包络体分散系。Preferably, in step 3), the mixture is uniformly mixed under high shear force and then left to stand for 1-5 seconds to form a filler/MFC pre-envelope dispersion system.
优选的，步骤3)中加入的填料为轻质碳酸钙或滑石粉。Preferably, the filler added in step 3) is light calcium carbonate or talcum powder.
相对于现有技术，本发明具有以下有益效果：Compared with the prior art, the present invention has the following beneficial effects:
本发明采取以微纤化纤维素为助留和增强手段，微纤化纤维素微观结构呈树枝状，分枝度高，在造纸湿法成形时相互搭接可形成数量远大于普通纸浆纤维的细密网络结构，可形成对填料微粒的有效截留和包络，显著提高纸张中填料的留着率。同时，包络体表面的微纤化纤维素比表面积极大，且表面游离羟基极其丰富，可相互间及与纤维间形成数倍于普通纸浆纤维的氢键，解决了高含量填料纸张强度差的问题。最终，较好地化解了高加填技术中纸张强度和高加填量之间的矛盾。In the present invention, microfibrillated cellulose is used as retention and strengthening means. The microscopic structure of microfibrillated cellulose is dendritic, with a high degree of branching. During papermaking wet forming, the number of overlapping fibers can be formed much larger than that of ordinary pulp fibers. The fine network structure can form an effective trapping and enveloping of filler particles, significantly improving the retention rate of fillers in paper. At the same time, the specific surface area of microfibrillated cellulose on the surface of the envelope is extremely large, and the free hydroxyl groups on the surface are extremely rich, which can form hydrogen bonds with each other and with fibers several times that of ordinary pulp fibers, which solves the problem of poor strength of paper with high filler content. The problem. Finally, the contradiction between paper strength and high filling amount in the high filling technology is better resolved.
【具体实施方式】【Detailed ways】
本发明一种微纤化纤维素包络助留高加填造纸工艺，包括以下步骤：The invention discloses a microfibrillated cellulose enveloping retention aid high filling papermaking process, comprising the following steps:
1)首先，把工业微纤化纤维素产品加水稀释至质量百分比为1％～5％的浓度，然后在常温下进行超声波处理，超声波功率为300W，频率20kHz，处理时间20～40min。1) First, dilute the industrial microfibrillated cellulose product with water to a concentration of 1% to 5% by mass, and then perform ultrasonic treatment at room temperature with an ultrasonic power of 300W, a frequency of 20kHz, and a treatment time of 20 to 40 minutes.
2)将步骤1)超声波处理后的微纤化纤维素浓缩至质量百分比为10％的浓度，采用PFI磨浆机进行细纤维化处理，处理转数为20000～60000转，进一步提高微纤化纤维素的细纤维化程度，使整体原料形成分枝度高且均匀的微细纤维丝网络。2) Concentrate the microfibrillated cellulose after the ultrasonic treatment in step 1) to a concentration of 10% by mass, and use a PFI refiner to perform fine fibrillation treatment, and the processing rotation number is 20,000 to 60,000 revolutions to further improve the microfibrillation The degree of fibrillation of cellulose makes the whole raw material form a highly branched and uniform network of fine fibers.
3)将步骤2)细纤维化处理后的微纤化纤维素加水稀释为质量百分比为2％～8％的浓度，然后加入填料——轻质碳酸钙/滑石粉。再高剪切力混合均匀后静置1～5秒，形成填料/MFC预包络体分散系。其中，轻质碳酸钙/滑石粉占填料/MFC预包络体分散系中总固形物质量百分比为70％～90％。3) Dilute the microfibrillated cellulose after the fibrillation treatment in step 2) with water to a concentration of 2% to 8% by mass, and then add filler—light calcium carbonate/talcum powder. After mixing evenly under high shear force, let stand for 1 to 5 seconds to form a filler/MFC pre-envelope dispersion system. Wherein, the light calcium carbonate/talcum powder accounts for 70%-90% of the total solid matter in the filler/MFC pre-envelope dispersion system.
4)按填料/MFC预包络体分散系中固形物质量百分比0.02％～0.06％的量加入助留助滤剂阳离子聚丙烯酰胺，低剪切混合均匀后形成较稳定的填料/MFC包络体分散系。4) Add the retention and drainage aid cationic polyacrylamide according to the mass percentage of 0.02% to 0.06% of the solid matter in the filler/MFC pre-envelope dispersion system, and form a relatively stable filler/MFC envelope after low-shear mixing. body dispersion.
5)将步骤4)中形成的填料/MFC包络体分散系加入普通化学浆纸浆中进行低剪切力混合均匀形成总分散系。其中，填料/MFC包络体分散系中固形物含量为加入纸浆后总分散系中固形物总质量的45％～70％。然后迅速加入纸页成型器中进行抄造成形、干燥。即得到微纤化纤维素包络助留的高加填纸张。5) The filler/MFC inclusion body dispersion formed in step 4) is added to common chemical pulp for low-shear mixing to form a total dispersion. Wherein, the solid content in the dispersion system of the filler/MFC inclusion body is 45% to 70% of the total mass of solids in the total dispersion system after adding the pulp. Then it is quickly added to the sheet former for paper forming and drying. That is to obtain highly filled paper with microfibrillated cellulose enveloping retention.
实施例1Example 1
一种微纤化纤维素包络助留高加填造纸工艺，包括以下步骤：A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:
1)首先，把工业微纤化纤维素产品加水稀释至质量百分比为1％的浓度，然后在常温下进行超声波处理，超声波功率为300W，频率20kHz，处理时间20min。1) First, dilute the industrial microfibrillated cellulose product with water to a concentration of 1% by mass, and then perform ultrasonic treatment at room temperature, with ultrasonic power of 300W, frequency of 20kHz, and treatment time of 20min.
2)将步骤1)超声波处理后的微纤化纤维素浓缩至质量百分比为10％的浓度，采用PFI磨浆机进行细纤维化处理，处理转数为60000转，进一步提高微纤化纤维素的细纤维化程度，使整体原料形成分枝度高且均匀的微细纤维丝网络。2) Concentrate the microfibrillated cellulose after the ultrasonic treatment in step 1) to a concentration of 10% by mass, and use a PFI refiner to perform fine fibrillation treatment, and the number of processing rotations is 60,000 revolutions to further improve the quality of the microfibrillated cellulose. The degree of fibrillation makes the whole raw material form a highly branched and uniform microfiber network.
3)将步骤2)细纤维化处理后的微纤化纤维素加水稀释为质量百分比为8％的浓度，然后加入填料——轻质碳酸钙。再高剪切力混合均匀后静置1～5秒，形成填料/MFC预包络体分散系。其中，轻质碳酸钙占填料/MFC预包络体分散系中总固形物质量百分比为70％。3) Dilute the microfibrillated cellulose after the fibrillation treatment in step 2) with water to a concentration of 8% by mass, and then add filler—light calcium carbonate. After mixing evenly under high shear force, let stand for 1 to 5 seconds to form a filler/MFC pre-envelope dispersion system. Wherein, light calcium carbonate accounts for 70% of the total solid matter in the filler/MFC pre-envelope dispersion system.
4)按填料/MFC预包络体分散系中固形物质量百分比0.02％的量加入助留助滤剂阳离子聚丙烯酰胺，低剪切混合均匀后形成较稳定的填料/MFC包络体分散系。4) Add the retention and drainage aid cationic polyacrylamide according to the solid content of 0.02% in the filler/MFC pre-envelope dispersion system, and form a relatively stable filler/MFC inclusion body dispersion system after low-shear mixing. .
5)将步骤4)中形成的填料/MFC包络体分散系加入普通化学浆纸浆中进行低剪切力混合均匀形成总分散系。其中，填料/MFC包络体分散系中固形物含量为加入纸浆后总分散系中固形物总质量的45％。然后迅速加入纸页成型器中进行抄造成形、干燥。即得到微纤化纤维素包络助留的高加填纸张。5) The filler/MFC inclusion body dispersion formed in step 4) is added to common chemical pulp for low-shear mixing to form a total dispersion. Wherein, the solid content in the dispersion system of the filler/MFC inclusion body is 45% of the total mass of solids in the total dispersion system after adding the pulp. Then it is quickly added to the sheet former for paper forming and drying. That is to obtain highly filled paper with microfibrillated cellulose enveloping retention.
实施例2Example 2
一种微纤化纤维素包络助留高加填造纸工艺，包括以下步骤：A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:
1)首先，把工业微纤化纤维素产品加水稀释至质量百分比为3％的浓度，然后在常温下进行超声波处理，超声波功率为300W，频率20kHz，处理时间40min。1) First, dilute the industrial microfibrillated cellulose product with water to a concentration of 3% by mass, and then perform ultrasonic treatment at room temperature, with ultrasonic power of 300W, frequency of 20kHz, and treatment time of 40min.
2)将步骤1)超声波处理后的微纤化纤维素浓缩至质量百分比为10％的浓度，采用PFI磨浆机进行细纤维化处理，处理转数为20000转，进一步提高微纤化纤维素的细纤维化程度，使整体原料形成分枝度高且均匀的微细纤维丝网络。2) Concentrate the microfibrillated cellulose after the ultrasonic treatment in step 1) to a concentration of 10% by mass, and use a PFI refiner to perform fine fibrillation treatment, and the number of processing rotations is 20,000 revolutions to further improve the quality of the microfibrillated cellulose. The degree of fibrillation makes the whole raw material form a highly branched and uniform microfiber network.
3)将步骤2)细纤维化处理后的微纤化纤维素加水稀释为质量百分比为5％的浓度，然后加入填料——轻质碳酸钙。再高剪切力混合均匀后静置1～5秒，形成填料/MFC预包络体分散系。其中，轻质碳酸钙占填料/MFC预包络体分散系中总固形物质量百分比为90％。3) Dilute the microfibrillated cellulose after the fibrillation treatment in step 2) with water to a concentration of 5% by mass, and then add filler—light calcium carbonate. After mixing evenly under high shear force, let stand for 1 to 5 seconds to form a filler/MFC pre-envelope dispersion system. Wherein, light calcium carbonate accounts for 90% of the total solid matter in the filler/MFC pre-envelope dispersion system.
4)按填料/MFC预包络体分散系中固形物质量百分比0.03％的量加入助留助滤剂阳离子聚丙烯酰胺，低剪切混合均匀后形成较稳定的填料/MFC包络体分散系。4) Add the retention and drainage aid cationic polyacrylamide according to the solid content of 0.03% in the filler/MFC pre-envelope dispersion system, and form a relatively stable filler/MFC inclusion body dispersion system after low-shear mixing. .
5)将步骤4)中形成的填料/MFC包络体分散系加入普通化学浆纸浆中进行低剪切力混合均匀形成总分散系。其中，填料/MFC包络体分散系中固形物含量为加入纸浆后总分散系中固形物总质量的70％。然后迅速加入纸页成型器中进行抄造成形、干燥。即得到微纤化纤维素包络助留的高加填纸张。5) The filler/MFC inclusion body dispersion formed in step 4) is added to common chemical pulp for low-shear mixing to form a total dispersion. Wherein, the solid content in the filler/MFC inclusion body dispersion system is 70% of the total solid content in the total dispersion system after adding the pulp. Then it is quickly added to the sheet former for paper forming and drying. That is to obtain highly filled paper with microfibrillated cellulose enveloping retention.
实施例3Example 3
一种微纤化纤维素包络助留高加填造纸工艺，包括以下步骤：A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:
1)首先，把工业微纤化纤维素产品加水稀释至质量百分比为5％的浓度，然后在常温下进行超声波处理，超声波功率为300W，频率20kHz，处理时间30min。1) First, dilute the industrial microfibrillated cellulose product with water to a concentration of 5% by mass, and then perform ultrasonic treatment at room temperature, with ultrasonic power of 300W, frequency of 20kHz, and treatment time of 30min.
2)将步骤1)超声波处理后的微纤化纤维素浓缩至质量百分比为10％的浓度，采用PFI磨浆机进行细纤维化处理，处理转数为50000转，进一步提高微纤化纤维素的细纤维化程度，使整体原料形成分枝度高且均匀的微细纤维丝网络。2) Concentrate the microfibrillated cellulose after the ultrasonic treatment in step 1) to a concentration of 10% by mass, and use a PFI refiner to perform fine fibrillation treatment, and the number of processing rotations is 50,000 revolutions to further improve the quality of the microfibrillated cellulose. The degree of fibrillation makes the whole raw material form a highly branched and uniform microfiber network.
3)将步骤2)细纤维化处理后的微纤化纤维素加水稀释为质量百分比为8％的浓度，然后加入填料——滑石粉。再高剪切力混合均匀后静置1～5秒，形成填料/MFC预包络体分散系。其中，滑石粉占填料/MFC预包络体分散系中总固形物质量百分比为80％。3) Dilute the microfibrillated cellulose after the fibrillation treatment in step 2) with water to a concentration of 8% by mass, and then add filler—talcum powder. After mixing evenly under high shear force, let stand for 1 to 5 seconds to form a filler/MFC pre-envelope dispersion system. Wherein, the talc powder accounts for 80% of the total solid matter in the filler/MFC pre-envelope dispersion system.
4)按填料/MFC预包络体分散系中固形物质量百分比0.06％的量加入助留助滤剂阳离子聚丙烯酰胺，低剪切混合均匀后形成较稳定的填料/MFC包络体分散系。4) Add the retention and drainage aid cationic polyacrylamide according to the solid matter percentage of 0.06% in the filler/MFC pre-envelope dispersion system, and form a relatively stable filler/MFC inclusion body dispersion system after low-shear mixing. .
5)将步骤4)中形成的填料/MFC包络体分散系加入普通化学浆纸浆中进行低剪切力混合均匀形成总分散系。其中，填料/MFC包络体分散系中固形物含量为加入纸浆后总分散系中固形物总质量的55％。然后迅速加入纸页成型器中进行抄造成形、干燥。即得到微纤化纤维素包络助留的高加填纸张。5) The filler/MFC inclusion body dispersion formed in step 4) is added to common chemical pulp for low-shear mixing to form a total dispersion. Wherein, the solid content in the dispersion system of the filler/MFC inclusion body is 55% of the total mass of solids in the total dispersion system after adding the pulp. Then it is quickly added to the sheet former for paper forming and drying. That is to obtain highly filled paper with microfibrillated cellulose enveloping retention.
实施例4Example 4
一种微纤化纤维素包络助留高加填造纸工艺，包括以下步骤：A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:
1)首先，把工业微纤化纤维素产品加水稀释至质量百分比为4％的浓度，然后在常温下进行超声波处理，超声波功率为300W，频率20kHz，处理时间40min。1) First, dilute the industrial microfibrillated cellulose product with water to a concentration of 4% by mass, and then perform ultrasonic treatment at room temperature, with ultrasonic power of 300W, frequency of 20kHz, and treatment time of 40min.
2)将步骤1)超声波处理后的微纤化纤维素浓缩至质量百分比为10％的浓度，采用PFI磨浆机进行细纤维化处理，处理转数为45000转，进一步提高微纤化纤维素的细纤维化程度，使整体原料形成分枝度高且均匀的微细纤维丝网络。2) Concentrate the microfibrillated cellulose after the ultrasonic treatment in step 1) to a concentration of 10% by mass, and use a PFI refiner to perform fine fibrillation treatment with a processing rotation number of 45,000 revolutions to further improve the microfibrillated cellulose The degree of fibrillation makes the whole raw material form a highly branched and uniform microfiber network.
3)将步骤2)细纤维化处理后的微纤化纤维素加水稀释为质量百分比为6％的浓度，然后加入填料——轻质碳酸钙。再高剪切力混合均匀后静置1～5秒，形成填料/MFC预包络体分散系。其中，轻质碳酸钙占填料/MFC预包络体分散系中总固形物质量百分比为75％。3) Dilute the microfibrillated cellulose after the fibrillation treatment in step 2) with water to a concentration of 6% by mass, and then add filler—light calcium carbonate. After mixing evenly under high shear force, let stand for 1 to 5 seconds to form a filler/MFC pre-envelope dispersion system. Wherein, light calcium carbonate accounts for 75% of the total solid matter in the filler/MFC pre-envelope dispersion system.
4)按填料/MFC预包络体分散系中固形物质量百分比0.05％的量加入助留助滤剂阳离子聚丙烯酰胺，低剪切混合均匀后形成较稳定的填料/MFC包络体分散系。4) Add the retention and drainage aid cationic polyacrylamide according to the solid content of 0.05% in the filler/MFC pre-envelope dispersion system, and form a relatively stable filler/MFC inclusion body dispersion system after low-shear mixing .
5)将步骤4)中形成的填料/MFC包络体分散系加入普通化学浆纸浆中进行低剪切力混合均匀形成总分散系。其中，填料/MFC包络体分散系中固形物含量为加入纸浆后总分散系中固形物总质量的60％。然后迅速加入纸页成型器中进行抄造成形、干燥。即得到微纤化纤维素包络助留的高加填纸张。5) The filler/MFC inclusion body dispersion formed in step 4) is added to common chemical pulp for low-shear mixing to form a total dispersion. Wherein, the solid content in the filler/MFC inclusion body dispersion system is 60% of the total solid content in the total dispersion system after adding the pulp. Then it is quickly added to the sheet former for paper forming and drying. That is to obtain highly filled paper with microfibrillated cellulose enveloping retention.
实施例5Example 5
一种微纤化纤维素包络助留高加填造纸工艺，包括以下步骤：A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:
1)首先，把工业微纤化纤维素产品加水稀释至质量百分比为2％的浓度，然后在常温下进行超声波处理，超声波功率为300W，频率20kHz，处理时间30min。1) First, dilute the industrial microfibrillated cellulose product with water to a concentration of 2% by mass, and then perform ultrasonic treatment at room temperature, with ultrasonic power of 300W, frequency of 20kHz, and treatment time of 30min.
2)将步骤1)超声波处理后的微纤化纤维素浓缩至质量百分比为10％的浓度，采用PFI磨浆机进行细纤维化处理，处理转数为35000转，进一步提高微纤化纤维素的细纤维化程度，使整体原料形成分枝度高且均匀的微细纤维丝网络。2) Concentrate the microfibrillated cellulose after the ultrasonic treatment in step 1) to a concentration of 10% by mass, and use a PFI refiner to perform fine fibrillation treatment, and the number of processing rotations is 35,000 revolutions to further improve the quality of the microfibrillated cellulose. The degree of fibrillation makes the whole raw material form a highly branched and uniform microfiber network.
3)将步骤2)细纤维化处理后的微纤化纤维素加水稀释为质量百分比为8％的浓度，然后加入填料——滑石粉。再高剪切力混合均匀后静置1～5秒，形成填料/MFC预包络体分散系。其中，滑石粉占填料/MFC预包络体分散系中总固形物质量百分比为80％。3) Dilute the microfibrillated cellulose after the fibrillation treatment in step 2) with water to a concentration of 8% by mass, and then add filler—talcum powder. After mixing evenly under high shear force, let stand for 1 to 5 seconds to form a filler/MFC pre-envelope dispersion system. Wherein, the talc powder accounts for 80% of the total solid matter in the filler/MFC pre-envelope dispersion system.
4)按填料/MFC预包络体分散系中固形物质量百分比0.02％的量加入助留助滤剂阳离子聚丙烯酰胺，低剪切混合均匀后形成较稳定的填料/MFC包络体分散系。4) Add the retention and drainage aid cationic polyacrylamide according to the solid content of 0.02% in the filler/MFC pre-envelope dispersion system, and form a relatively stable filler/MFC inclusion body dispersion system after low-shear mixing. .
5)将步骤4)中形成的填料/MFC包络体分散系加入普通化学浆纸浆中进行低剪切力混合均匀形成总分散系。其中，填料/MFC包络体分散系中固形物含量为加入纸浆后总分散系中固形物总质量的50％。然后迅速加入纸页成型器中进行抄造成形、干燥。即得到微纤化纤维素包络助留的高加填纸张。5) The filler/MFC inclusion body dispersion formed in step 4) is added to common chemical pulp for low-shear mixing to form a total dispersion. Wherein, the solid content in the dispersion system of the filler/MFC inclusion body is 50% of the total mass of solids in the total dispersion system after adding the pulp. Then it is quickly added to the sheet former for paper forming and drying. That is to obtain highly filled paper with microfibrillated cellulose enveloping retention.
本发明针对纸张中添加填料会引起纸张强度的损失和高加填过程中填料留着率低的造纸技术难题。以微纤化纤维素为助留和增强手段，微纤化纤维素分枝度高，在造纸湿法成形时相互搭接可形成数量远大于普通纸浆纤维的细密网络结构，有利于对填料粒子的截留和包络，显著提高纸张中填料的留着率。此外，微纤化纤维素比表面积极大，且表面游离羟基极其丰富，可形成数倍于普通纤维素纤维的氢键，解决了高含量填料纸张强度差的问题。最终，较好地化解了高加填技术中纸张强度和高加填量之间的矛盾。填料的价格远低于纸浆纤维，所以，这一发明有利于降低纸张的生产成本，提高企业的利润，更缓解了造纸行业纤维原料资源紧缺的局面。本发明工艺下：当填料含量为54.18％时，纸张抗张指数达30.21N·m/g；普通工艺下：当填料含量为24.79％，纸张抗张指数为29.63N·m/g。本发明所制备的纸张填料含量可高达54％以上，同时强度仍可达到普通造纸工艺下填料含量为25％的纸张强度。The invention aims at the technical problem of papermaking that the addition of fillers in paper will cause the loss of paper strength and the retention rate of fillers is low in the process of high filling. Microfibrillated cellulose is used as a means of retention and reinforcement. Microfibrillated cellulose has a high degree of branching. During papermaking wet forming, the overlapping of each other can form a fine network structure that is much larger than ordinary pulp fibers, which is beneficial to the filler particles. The entrapment and envelope of the paper can significantly improve the retention rate of the filler in the paper. In addition, the specific surface of microfibrillated cellulose is extremely large, and the free hydroxyl groups on the surface are extremely rich, which can form hydrogen bonds several times that of ordinary cellulose fibers, which solves the problem of poor strength of paper with high filler content. Finally, the contradiction between paper strength and high filling amount in the high filling technology is better resolved. The price of the filler is much lower than that of pulp fiber, so this invention is beneficial to reduce the production cost of paper, improve the profit of the enterprise, and alleviate the shortage of fiber raw material resources in the paper industry. Under the process of the present invention: when the filler content is 54.18%, the tensile index of the paper reaches 30.21N·m/g; under the ordinary process: when the filler content is 24.79%, the tensile index of the paper is 29.63N·m/g. The filler content of the paper prepared by the invention can be as high as more than 54%, while the strength can still reach the strength of the paper with the filler content of 25% in the common papermaking process.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410620847.XACN104452425B (en) | 2014-11-06 | 2014-11-06 | Microfiber cellulose enveloped and retained high filling papermaking process |
| Application Number | Priority Date | Filing Date | Title |
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| CN201410620847.XACN104452425B (en) | 2014-11-06 | 2014-11-06 | Microfiber cellulose enveloped and retained high filling papermaking process |
| Publication Number | Publication Date |
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| CN104452425Atrue CN104452425A (en) | 2015-03-25 |
| CN104452425B CN104452425B (en) | 2017-04-26 |
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| CN201410620847.XAExpired - Fee RelatedCN104452425B (en) | 2014-11-06 | 2014-11-06 | Microfiber cellulose enveloped and retained high filling papermaking process |
| Country | Link |
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| CN (1) | CN104452425B (en) |
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| CN116815540A (en)* | 2023-07-18 | 2023-09-29 | 宁波亚洲浆纸业有限公司 | Filler coating method, paper and preparation method thereof |
| CN119221320A (en)* | 2024-09-13 | 2024-12-31 | 宁波亚洲浆纸业有限公司 | Paper products, papermaking pulp, papermaking filler and preparation method thereof |
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