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Method for improving papermaking drainage performance by adopting microfibrillated fibers

A technology of microfibrillation and performance, which is applied in the post-treatment modification of cellulose pulp, the addition of non-fibrous pulp, and the treatment of fiber raw materials. It can solve problems such as water drainage problems, reduce dosage, increase filler content, and improve drainage. and the effect of retaining performance

Active Publication Date: 2021-07-13
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although microfibrillated fibers can effectively improve the strength of paper, since the surface of microfibrillated fibers contains abundant hydrophilic groups, there will be water drainage problems when used directly

Method used

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  • Method for improving papermaking drainage performance by adopting microfibrillated fibers
  • Method for improving papermaking drainage performance by adopting microfibrillated fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Fully decompress the hardwood chemical pulp in a beater, then adjust the fiber solid content to 3.5% after decompression, and then grind it on a grinder to prepare microfibrillated cellulose, and select the obtained grinding gap as -2um The median particle size of microfibrillated cellulose is 21 μm.

[0021] (2) Mix bleached kraft softwood pulp (beating degree 40~45°SR) and bleached kraft hardwood pulp (beating degree 37~42°SR) in a mass ratio of 30:70, and add 5% micro Fibrillated cellulose, 50% GCC, 1% cationic starch, 0.2% AKD sizing agent and 0.03% cationic polyacrylamide retention aid, mix well, add water to dilute to a pulp concentration of 0.5%, and use standard paper sheet forming Machine for papermaking, paper weight 60g / m 2 . The water filtration performance of paper material is as attached figure 1 As shown in Table 1, the paper properties are shown in Table 2.

[0022] The water filtration performance of the paper material is expressed by the suctio...

Embodiment 2

[0024] (1) Fully decompose the hardwood chemical pulp in a beater, then adjust the fiber solid content to 3.0% after decompression, add 0.5% polydiallyl dimethyl ammonium chloride to this suspension and mix well uniform. The uniformly mixed pulp fiber suspension was ground on a grinder to prepare microfibrillated cellulose, and the median particle size of the obtained microfibrillated cellulose was 16.3um when the grinding gap was selected to be -2um.

[0025] (2) After fully mixing the ground microfibrillated cellulose and GCC, continue to grind in the grinder until the formation of microfibrillated fibers and filler composites. The amount of microfibrillated cellulose is calculated as 5% dry GCC. %.

[0026] (3) Mix bleached kraft softwood pulp (beating degree 40~45°SR) and bleached kraft hardwood pulp (beating degree 37~42°SR) in a mass ratio of 30:70, and add 55% micro Fibrillated fiber-filler compound, 1% cationic starch, 0.2% AKD sizing agent and 0.03% cationic polyacr...

Embodiment 3

[0028] (1) The bleached bamboo pulp is fully decomposed in a beater, and then the fiber solid content is adjusted to 4.5% after decompression, and 0.25% polyamine is added to the suspension and fully mixed. The uniformly mixed pulp fiber suspension was ground on a grinder to prepare microfibrillated cellulose, and the median particle size of the obtained microfibrillated cellulose was 68.9um when the grinding gap was selected to be -5um.

[0029] (2) After fully mixing the ground microfibrillated cellulose and china clay, continue grinding in the grinder until the formation of microfibrillated fibers and filler composites, the amount of microfibrillated cellulose is 10% based on the amount of dry china clay %.

[0030] (3) Mix bleached kraft softwood pulp (beating degree 40~45°SR) and bleached kraft hardwood pulp (beating degree 37~42°SR) in a mass ratio of 30:70, and add 55% micro Fibrillated fiber-filler compound, 1% cationic starch, 0.2% AKD sizing agent and 0.03% cationic...

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Abstract

The invention provides a method for improving the water filtering performance of paper by adopting microfibrillated fibers, and particularly relates to a method for forming a compound by adopting the microfibrillated fibers and fine components and then filling the compound into a papermaking process, so that the water filtering performance and the retention performance of the paper can be improved, the ash content in the paper can be effectively improved, and the use amount of paper pulp fibers can be reduced. Under the same paper making process conditions, the content of the filler in the paper can be increased on the premise that the strength performance of the paper is guaranteed, the papermaking water filtration and retention performance of the paper can be effectively improved, and the problem that the water filtration performance is reduced due to the fact that microfibrillated fibers are used for a papermaking system is effectively solved. The microfibrillated fibers and fine components obtained through white water recovery are adopted to form a compound to be used for paper filling, and the use amount of fresh paper pulp can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking, and in particular relates to a method for improving the water drainage performance of paper by adopting microfibrillated fibers. Background technique [0002] With the growth of paper and cardboard consumption and the rapid increase of paper industry production capacity, the supply of fiber raw materials has become a bottleneck restricting the development of the industry. At present, the global papermaking raw materials are still in a tense situation. How to replace pulp with as many mineral fillers as possible and improve the utilization rate of fibers has become the development trend of papermaking technology. [0003] Traditional fillers and filling methods will reduce the bonding strength between fibers in the slurry. At present, traditional fillers are used in papermaking. By optimizing the retention and drainage system and increasing the amount of retention and drainage aid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/18D21H11/22D21H21/24D21H17/68D21H17/67D21H21/10
CPCD21H11/18D21H11/22D21H21/24D21H17/68D21H17/675D21H21/10Y02W30/64
Inventor 苏艳群张瑞娟刘金刚
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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