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Microfiber cellulose enveloped and retained high filling papermaking process

A papermaking process and cellulose technology, applied in the direction of retention aid addition, synthetic cellulose/non-cellulose material pulp/paper, papermaking, etc., can solve the problems of low retention rate and loss of fillers, and improve the retention rate , solve the effect of poor strength and high branching degree

Active Publication Date: 2015-03-25
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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 very large. How to improve the high retention of filler is another technical problem to achieve high filling of paper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:

[0025] 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.

[0026] 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.

[0027] 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 ...

Embodiment 2

[0031] A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:

[0032] 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.

[0033] 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.

[0034] 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 ...

Embodiment 3

[0038] A kind of microfibrillated cellulose enveloping aid retention high filling papermaking process, comprises the following steps:

[0039] 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.

[0040] 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.

[0041] 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...

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Abstract

The invention discloses a microfiber cellulose enveloped and retained high filling papermaking process. The process comprises the following steps: grinding industrial microfiber celluloses after ultrasonic treatment by using a PFI mill to increase the fibrillating degree; then, firstly, uniformly mixing the celluloses with filler calcium carbonate or a talcum powder dispersion, standing to form a filler / MFC pre-enveloping body, and then adding cationic polyacrylamide to form a relatively stable enveloping body; adding into papermaking slurry to be uniformly mixed; and finally, manufacturing by using a common papermaking moulding process to obtain highly filled paper. The microfiber celluloses are high in branching degree and can be lap-jointed with one another during wet process moulding of papermaking to form dense network structures which are far greater than common paper pulp fibers in quantity, so that the interception and the envelopment of filler particles are facilitated and the retention rate of the filler in the paper is remarkably increased; the microfiber celluloses are extremely large in specific surface area and free hydroxyl groups on the surface are extremely abundant so as to form hydrogen bonds which are several times the common microfiber celluloses in quantity, so that the problem that a high-content filler paper-based material is poor in strength is solved.

Description

【Technical field】 [0001] The invention belongs to the field of pulping and papermaking, and in particular relates to a papermaking process. 【Background technique】 [0002] 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 appl...

Claims

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Application Information

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IPC IPC(8): D21H13/00D21H17/67D21H21/10
Inventor 李金宝修慧娟张美云贺行杨国鑫张向荣
Owner SHAANXI UNIV OF SCI & TECH
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