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Method for improving filler retention rate and paper evenness under the condition of high shear force

A high-shear, paper technology, applied in the field of improving paper strength, can solve problems such as paper strength decline, and achieve the effects of improving evenness, reducing impact, and reducing fiber flocculation

Active Publication Date: 2018-12-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: for the deficiencies in the prior art, the purpose of the present invention is to provide a bio-based chitosan / montmorillonite particle retention system and its ability to improve filler retention and improve paper evenness under high shear conditions method, while improving filler retention and paper formation, it also solves the problem of paper strength decline due to increased ash content

Method used

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  • Method for improving filler retention rate and paper evenness under the condition of high shear force
  • Method for improving filler retention rate and paper evenness under the condition of high shear force
  • Method for improving filler retention rate and paper evenness under the condition of high shear force

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Effect test

example 1

[0015] According to the amount of chitosan: the ratio of bentonite is 0ppm: 0ppm; 1000ppm: 0ppm; 1000ppm: 3000ppm three different ratios are added to the paper material; the ratio of the paper material is softwood pulp: hardwood pulp: waste paper pulp is 15% : 50%: , 35%, the amount of filler calcium carbonate added is 30% (relative to the amount of dry fiber), the concentration of montmorillonite is 0.3%, according to figure 1 The process flow shown is added, the chitosan solution is added to the slurry tank, and white water is added to dilute the slurry. After the high-shearing of the pulping pump, the montmorillonite dispersion was added, and the slurry was sprayed on the net for papermaking; and the influence on the retention and drainage properties of the paper material and the physical properties of the paper was determined.

[0016] Table 1 is the comparison of the application effect of chitosan unit retention system and chitosan / montmorillonite particle retention syste...

example 2

[0021] According to the amount of chitosan: the ratio of bentonite is 0ppm: 0ppm; 1000ppm: 0ppm; 1000ppm: 3000ppm three different ratios are added to the paper material; the ratio of the paper material is softwood pulp: hardwood pulp: waste paper pulp is 15% : 50%: , 35%, the amount of filler calcium carbonate added is 30% (relative to the amount of dry fiber), the concentration of montmorillonite is 0.8%, according to figure 1 The technological process shown is added, and the influence on the retention and drainage performance of paper stock and the physical properties of paper is determined.

[0022] Table 2

[0023]

[0024] Comparing the table data in Table 2, it can be concluded that the chitosan / montmorillonite particulate retention system can not only improve the retention and uniformity of fillers, but also improve the tensile strength of paper. The increase of montmorillonite concentration can increase the filler retention rate, but the formation index and tensile...

example 3

[0026] The dosages of chitosan / montmorillonite are 0.1% and 0.3% respectively; the dosages of cationic polyacrylamide / chitosan / montmorillonite are 0.05%, 0.05% and 0.3% respectively. The amount of filler calcium carbonate added is 30% (relative to the amount of dry fiber), according to figure 1 The process flow shown is added, and the influence on the retention and drainage properties of the paper material and the physical properties of the paper is determined.

[0027] Table 3 is the comparison of the application effects of chitosan / montmorillonite particle retention system, chitosan / cationic polyacrylamide / montmorillonite system and cationic polyacrylamide / montmorillonite system.

[0028] table 3

[0029]

[0030] Comparing the table data in Table 3, it can be concluded that the chitosan / montmorillonite system and the chitosan / cationic polyacrylamide / montmorillonite system can not only improve the retention rate of fillers, improve evenness, but also have a negative impa...

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Abstract

The invention provides a technical method for improving the filler retention rate and paper evenness of a high-speed paper machine and improving the paper forming strength by using a chitosan / montmorillonite binary particle retention aid system or a chitosan / cationic polyacrylamide / montmorillonite ternary retention aid system. The bio-based chitosan / montmorillonite microparticle retention aid system of the invention adopts chitosan with a deacetylation degree of 80-95 %, the dosage of chitosan is 0.03-0.1 % of the mass of the absolutely dry fiber raw material, the dosage of montmorillonite is0.1-0.5 % of the mass of the absolute dry fiber raw material, the cationic polyacrylamide is 0.03-0.1 % of the mass of the absolutely dry fiber. According to the method, the filler retention is improved under the condition of high shear force, the paper evenness is improved, and the problem that the paper strength is reduced due to the increase of ash content is solved.

Description

technical field [0001] The invention relates to the production field of producing high-ash paper under high-shear conditions, in particular to the use of chitosan / montmorillonite dual particle retention or chitosan / cationic polyacrylamide / montmorillonite ternary retention system A technical method to improve the filler retention rate and paper evenness of high-speed paper machines, and improve the strength of paper. Background technique [0002] Papermaking chemicals are divided into two types: functional and controllable. Among them, retention and drainage aids are used to improve paper filler retention and drainage speed, and have been widely used in the papermaking industry. However, while traditional unit retention aids improve the retention of paper fillers and increase ash content, at the same time, due to the flocculation of fine components, the paper evenness will be reduced, resulting in a reduction in the physical strength of the paper. [0003] Traditional partic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H21/10
CPCD21H21/10
Inventor 景宜倪烨燕胡倩
Owner NANJING FORESTRY UNIV
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