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Application of Carboxymethyl Chitin as Retention and Drainage Aid

A technology of carboxymethyl chitin and retention and drainage aid, applied in the field of papermaking aids, can solve the problems of short shelf life, no carboxymethyl chitin, poor retention and drainage effect, etc., and achieves low cost , Excellent retention and drainage performance, good effect

Inactive Publication Date: 2020-04-07
NEIJIANG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the retention and drainage effect of alum is poor
However, cationic starch has obvious disadvantages as a retention and drainage aid: a large amount of addition, must be gelatinized when used, cumbersome operation, short shelf life, and unsatisfactory use effect
It not only retains the excellent biological characteristics of chitin, but also has water solubility. So far, there have been no reports on the use of carboxymethyl chitin as a retention and drainage aid for papermaking.

Method used

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  • Application of Carboxymethyl Chitin as Retention and Drainage Aid
  • Application of Carboxymethyl Chitin as Retention and Drainage Aid
  • Application of Carboxymethyl Chitin as Retention and Drainage Aid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh an appropriate amount of pulp with a pulp concentration of 1.2% and dilute it with tap water to 0.2% pulp in a dynamic water filter, add 30% kaolin (relative to the dry weight of the pulp), stir at 300rpm for 30s, and add different predetermined amounts of substitution degrees 0.4 carboxymethyl chitin (relative to the dry weight of the pulp), stirred at 300rpm for 30s, and after the water was filtered, the filtrate was mixed evenly.

Embodiment 2

[0032] Weigh an appropriate amount of pulp with a pulp concentration of 1.2% and dilute it with tap water to 0.2% pulp in a dynamic water filter, add 30% kaolin (relative to the dry weight of the pulp), stir at 300rpm for 30s, and add different predetermined amounts of substitution degrees 0.5 carboxymethyl chitin (relative to the dry weight of the pulp), stirred at 300rpm for 30s, and after filtering, the filtrate was mixed evenly.

Embodiment 3

[0034] Weigh an appropriate amount of pulp with a pulp concentration of 1.2% and dilute it with tap water to 0.2% pulp in a dynamic water filter, add 30% kaolin (relative to the dry weight of the pulp), stir at 300rpm for 30s, and add different predetermined amounts of substitution degrees 0.6 carboxymethyl chitin (relative to the dry weight of the pulp), stirred at 300rpm for 30s, and after filtering, the filtrate was mixed evenly.

[0035] Determination of retention performance:

[0036] The retention performance is characterized by the retention rate of kaolin. The determination method is as follows: take about 10 mL of the filtrate, and measure its absorbance at 550 nm. Weigh different amounts of kaolin to prepare a suspension, measure its absorbance at 550nm, and obtain a standard curve y=1.552x+0.0079. The calculation method of filler retention rate is as follows:

[0037]

[0038] Among them: y—absorbance;

[0039] x—the mass of kaolin in the filtrate, g;

[004...

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Abstract

The invention relates to a papermaking aid, and particularly discloses application of carboxymethyl chitin to serving as a retention and filtration aid. The carboxymethyl chitin is discovered to have favorable retention aiding and filtration aiding effects and water solubility, can adapt to acidic and neutral conditions, and is a renewable resource to be developed. The invention also discloses a retention and filtration aid system prepared from the carboxymethyl chitin and polymeric aluminum chloride; the retention and filtration aid system is discovered to have excellent retention aiding and filtration aiding performance. The invention also proposes that the retention aiding and filtration aiding effects are also different once the addition sequences of two reagents in the system are different. The application of the carboxymethyl chitin to serving as the retention and filtration aid has the advantages that (1) the carboxymethyl chitin is proposed to be applied to the retention and filtration aid for the first time, and the retention and filtration aid which is favorable in the retention aiding and filtration aiding effects, is renewable, is low in cost and is applicable to acidic and neutral papermaking is obtained; (2) the retention and filtration aid system which is prepared from the carboxymethyl chitin and the polymeric aluminum chloride is proposed, and the system has the excellent retention aiding and filtration aiding performance.

Description

technical field [0001] The invention relates to a papermaking process, in particular to a papermaking auxiliary agent. Background technique [0002] Retention and drainage aid is the most important process aid in the wet end of papermaking. Its main function is to improve the retention rate of the pulp when it is filtered, and has an excellent retention effect on fine fibers and fillers. At the same time, it enhances the drainage of pulp and reduces Dehydration energy consumption during wet paper forming, pressing and drying. The above purpose is usually achieved by adding a certain amount of retention and drainage aids to the papermaking equipment during the papermaking process. During papermaking, the pulp is dispersed in water and transported to the papermaking equipment. During the papermaking process, retention and drainage aids are added, followed by water filtration to form and dry to finally obtain paper. [0003] Currently commonly used retention and drainage aids...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/10D21H17/66D21H17/26
CPCD21H17/26D21H17/66D21H21/10
Inventor 由耀辉孙绪兵雷光东马静黄辉曹锟
Owner NEIJIANG NORMAL UNIV
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