A spherical polyelectrolyte brush dual-element retention aid system and method for improving pulp retention

A technology of polyelectrolyte brush and retention rate, which is applied in the field of papermaking industry, can solve the problems of poor shear resistance and achieve the effects of strong shear resistance, less additive dosage and easy operation

Inactive Publication Date: 2017-03-29
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the problem that existing retention aids have poor shear resistance in the turbulent system formed by high-speed operating paper machines, and provides a spherical polyelectrolyte brush dual retention aid system and its improvement of pulp retention rate The method, its specific technical scheme is as follows:

Method used

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  • A spherical polyelectrolyte brush dual-element retention aid system and method for improving pulp retention
  • A spherical polyelectrolyte brush dual-element retention aid system and method for improving pulp retention
  • A spherical polyelectrolyte brush dual-element retention aid system and method for improving pulp retention

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Disperse the eucalyptus pulp fiber in water with a beating degree of 25°SR, and then uniformly mix it with precipitated calcium carbonate whose mass percentage is 10% relative to the dry eucalyptus pulp fiber to obtain a slurry. At a stirring speed of 600rpm, a cationic spherical polyelectrolyte brush of 2.0 to 3.5% relative to the dry eucalyptus pulp fiber mass percentage is added, and the inner core of the cationic spherical polyelectrolyte brush is SiO 2 The particle size is 60nm, the molecular weight of the brush layer is 71300g / mol, and the charge density is 250μeq / g; after 60 seconds, add anionic polyacrylamide (6 million molecular weight) that is 0.01% relative to the absolute dry eucalyptus pulp fiber mass percentage, and continue After stirring for 60 seconds, open the drain valve, take the filtrate of the first 100ml, and measure the total retention rate of the slurry and the filler retention rate as shown in Table 1.

[0031] Table 1 Effect of CSPB / APAM dual ...

Embodiment 2

[0034] Disperse reed pulp fibers in water with a beating degree of 33°SR, and then uniformly mix it with 10% chalk relative to the absolute dry reed pulp fiber mass percentage to obtain a slurry. At a stirring speed of 600rpm, a cationic spherical polyelectrolyte brush with a mass percentage of 1.0 to 2.5% relative to the dry reed pulp fiber is added, and the inner core of the cationic spherical polyelectrolyte brush is SiO 2 The particle size is 80nm, the molecular weight of the brush layer is 106700g / mol, and the charge density is 340μeq / g; after 60 seconds, add anionic polyacrylamide (6 million molecular weight) that is 0.03% relative to the absolute dry reed pulp fiber mass percentage, and continue stirring After 60 seconds, open the drain valve, get the filtrate of the first 100ml, and record the total retention rate of the slurry and the filler retention rate as shown in Table 2.

[0035] Table 2 Effect of CSPB / APAM dual system on the retention rate of reed pulp

[0036...

Embodiment 3

[0038] Disperse the eucalyptus pulp fiber in water with a beating degree of 44°SR, and then uniformly mix it with precipitated calcium carbonate whose mass percentage is 20% relative to the dry eucalyptus pulp fiber to obtain a slurry. At a stirring speed of 600rpm, a cationic spherical polyelectrolyte brush of 1.0 to 2.5% relative to the mass percentage of the dry eucalyptus pulp fiber is added, and the inner core of the cationic spherical polyelectrolyte brush is SiO 2 The particle size is 100nm, the molecular weight of the brush layer is 154900g / mol, and the charge density is 395.5μeq / g; after 60 seconds, add anionic polyacrylamide (8 million molecular weight) that is 0.02% relative to the absolute dry eucalyptus pulp fiber mass percentage, After continuing to stir for 60 seconds, open the drain valve, get the filtrate of the first 100ml, and record the total retention rate and filler retention rate of the slurry as shown in Table 3.

[0039] Table 3 Effect of CSPB / APAM dua...

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Abstract

The invention provides a binary retention system for a spherical polyelectrolyte brush for improving the retention rate of paper pulp. The binary retention system is composed of a cationic spherical polyelectrolyte brush and anionic polyacrylamide, wherein the cationic spherical polyelectrolyte brush regards SiO2 as an inner core and a copolymer of acrylamide and methacryloyloxyethyl trimethyl ammonium chloride as an outer brush. The invention further provides a method for improving the retention rate by using the binary retention system. The method comprises: sequentially adding the binary retention system composed of the cationic spherical polyelectrolyte brush and anionic polyacrylamide into scattered paper pulp to improve the retention rate of the slurry. The cationic spherical polyelectrolyte brush provided by the invention has high symmetric or quasi-symmetric structures, so that the anti-shear ability is relatively strong. The system has both the characteristics of a highly branched structure and high charge density and is easily to induce flocculation in high speed papermaking so as to improve the retention performance of a modern papermaking system. The binary system adopted by the invention remarkably improves the retention rate of the paper pulp and is simple and convenient to operate and less in use level of auxiliaries.

Description

technical field [0001] The invention belongs to the field of papermaking industry, and in particular relates to a spherical polyelectrolyte brush dual-element retention system for improving the pulp retention rate and a method for improving the pulp retention rate. Background technique [0002] In the paper industry, in order to increase the retention rate of fibers and fillers in the slurry on the forming wire, reduce the load of wastewater treatment and environmental pollution, improve the operating capacity of the paper machine, and reduce the cost of paper production, it is usually used in the paper wet end Use retention aids. The earliest retention aids used in the wet end of papermaking were cationic polymer-based retention aids, including cationic polyacrylamide, polydimethyldiallylammonium chloride, and cationic starch. These cationic polymers cause paper flocculation by bridging mechanism, although they have a certain retention effect, but the formed flocs are larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/10
Inventor 黎厚斌黄瑜张雄志何宇航刘成金
Owner WUHAN UNIV
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