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Method for preparing filler-cellulose composite papermaking filler

A technology of paper-making fillers and composites, applied in the field of paper-making, can solve the problems of increasing the amount of sizing agent, reducing the bonding strength of fibers, and destroying the bonding force between fibers, etc., achieving the effect of increasing bonding force, improving strength index, and low price

Active Publication Date: 2010-05-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional fillers and filling methods also have shortcomings. During the formation of paper sheets, the bonding force between fibers is destroyed, and the bonding strength between fibers in the slurry is reduced, so that the strength performance of the finished paper often decreases. Reduced; sizing agent is easy to adsorb on the surface of filler particles, under the condition that the performance of paper meets the actual needs, increase the amount of sizing agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First, blend 10 g of calcined kaolin and 0.7 g of crushed bleached kraft pulp (moisture content: 10%) on a dry basis, and add it to 10.5 g of a commercially available NMMO aqueous solution with a mass fraction of 50% , the mass ratio of the NMMO aqueous solution to the dry bleached kraft pulp was 15:1, and mixed at 40° C. for 50 min to obtain a raw material mixture. Then, in a vacuum of 8×10 4 pa, under the condition of 90° C., 4.5 g of water in the mixture was distilled off to make the water content of the NMMO aqueous solution 13%, so as to dissolve the bleached kraft pulp. Stir again at a high speed of 800r / min to precipitate precipitates. The precipitated precipitate is collected, washed, dried, cooled, and pulverized into particles no larger than 80 meshes to obtain the filler-cellulose composite paper filler. NMMO is recovered by atmospheric distillation, and the recovery rate reaches 99%, so that it can be recycled.

Embodiment 2

[0026] First, the particle size of 10g is not more than 325 mesh precipitated calcium carbonate and the unbleached kraft pulp (moisture is 10%) crushed by 1g of dry mass is blended, and it is added to 20g of commercially available mass concentration of 50 % NMMO aqueous solution, the mass ratio of the NMMO aqueous solution to the absolute dry bleached kraft pulp is 20:1, mixed at 70°C for 30min to obtain a raw material mixture. Then, in a vacuum of 9×10 4 Pa, the temperature is 100 ℃ under the condition of steaming the moisture of 8.9g in the mixture, make the moisture of NMMO solution be 10%, make unbleached kraft pulp dissolve. The mixture was stirred at a high speed of 700 r / min to precipitate precipitates. The precipitated precipitate is collected, washed, dried, cooled, and pulverized into particles no larger than 80 meshes to obtain the filler-cellulose composite paper filler. The NMMO aqueous solution is recovered by atmospheric distillation, and the recovery rate rea...

Embodiment 3

[0028] First, the particle size of 10g is not more than 325 mesh ground calcium carbonate and the crushed deinking pulp (moisture 10%) blending of 0.8g in absolute dry mass, and it is added to 8g of commercially available mass concentration of 50%. In the NMMO aqueous solution, the mass ratio of the NMMO aqueous solution to the dry deinking pulp is 10:1, and mixed at 30° C. for 1 h to obtain a raw material mixture. Then, in a vacuum of 9×10 4 Pa, under the condition of 95° C., 3.4 g of water in the mixture was distilled to make the water of the NMMO solution 13%, so as to dissolve the deinked slurry. The mixture was stirred at a high speed of 600r / min, and precipitates were deposited. The precipitated precipitate is collected, washed, dried, cooled, and pulverized into particles no larger than 80 meshes to obtain the filler-cellulose composite paper filler. The NMMO aqueous solution is recovered by atmospheric distillation, and the recovery rate reaches 99%, so that it can b...

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Abstract

The invention discloses a method for preparing a filler-cellulose composite papermaking filler. The method comprises the following steps of: mixing a filler and a pulp of crushed cellulose; adding the mixture into solution of N-methyl morpholine oxide sold in the market; mixing the mixture and the solution of N-methyl morpholine oxide at a certain temperature; evaporating redundant moisture under the conditions of reduced pressure and heating to dissolve the cellulose pulp; stirring a mixture of the filler and the aqueous solution of NMMO dissolved with the cellulose pulp at a high speed to separate out a precipitate to obtain the filler-cellulose composite papermaking filler; and recovering the aqueous solution of the NMMO by an atmospheric distillation method for recycling. The filler-cellulose composite papermaking filler can partially replace a plant fiber to serve as the papermaking filler and has an optimal usage amount between 9 to 25 percent. The filler-cellulose composite can partially replace the plant fiber to serve as the filler to be applied to the papermaking industry and can obviously improve the strength performance of paper.

Description

technical field [0001] The invention belongs to the field of papermaking, and in particular relates to a preparation method of filler-cellulose composite papermaking filler. Background technique [0002] The paper industry has long used mineral fillers to replace some of the virgin fibers in pulp. In recent years, the technology has rapidly matured and become an integral part of the papermaking process. In general, mineral fillers are the most important components of the raw materials used in the papermaking process. The reasons are as follows: it can protect the environment and reduce production costs by replacing virgin fibers; it can increase production without additionally increasing the pulping capacity; it can improve the water filtration performance and drying rate of paper materials, and to a certain extent increase the speed of paper machines, Save drying energy, reduce paper production operating costs; improve paper properties such as whiteness, opacity, gloss, p...

Claims

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Application Information

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IPC IPC(8): D21H17/70
Inventor 樊慧明白雯锐刘建安
Owner SOUTH CHINA UNIV OF TECH
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