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Application of chitosan of N-(2-hydroxy-3-dimethyl)propyl ammonium chloride

A technology of trimethylammonium chloride and propyl shell, applied in non-fiber pulp addition, retention aid addition, papermaking, etc., can solve the problems of restricting the use of chitosan, reduce sewage pollution, reduce white water concentration, and achieve excellent performance. Effect

Inactive Publication Date: 2006-09-06
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of studies have shown that it can be used as a papermaking aid (such as strengthening agent, retention and drainage aid, sewage treatment agent, etc.) under acidic conditions. Use of glycans

Method used

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  • Application of chitosan of N-(2-hydroxy-3-dimethyl)propyl ammonium chloride
  • Application of chitosan of N-(2-hydroxy-3-dimethyl)propyl ammonium chloride
  • Application of chitosan of N-(2-hydroxy-3-dimethyl)propyl ammonium chloride

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Example 1: Add 0.5 mol hydrochloric acid dropwise to 0.5 mol trimethylamine solution at 4°C, mix well and heat to 30°C, add 0.42mol epichlorohydrin, stir, and add dropwise within 1-1.5 hours to 50°C 50ml of 40% solution, maintain the pH=9 of the mixed solution, and continue to react for 2.5 hours. Afterwards, the reaction mixture was transferred to a reduced-pressure evaporator and evaporated for 30 minutes (40° C., vacuum degree: 0.09 MPa) to obtain a cationic intermediate. Then add 12 grams of chitosan with a molecular weight of 200,000 to the above-mentioned intermediate solution, adjust the pH to 9, stir, and maintain the reaction at 75°C for 6 hours to obtain the crude chitosan quaternary ammonium salt, which is ultrafiltered , concentrated at 100 DEG C and vacuum-dried to obtain N-(2-hydroxy-3-trimethylammonium chloride) propyl chitosan with a molecular weight of 190,000 and a degree of substitution of 90%.

Embodiment 2

[0014] Embodiment 2: the molecular weight 11 * 10 4 , N-(2-hydroxyl-3-trimethylammonium chloride) propyl chitosan with a substitution degree of 93% is formulated into an aqueous solution, and added to a beating degree of 43 0 In the reed slurry of SR, add 20% CaCO relative to the dry slurry after slight and brief stirring 3 (average particle size: 2.69μm, specific surface area: 41684cm 2 / g) suspension (3%), after stirring, make a tablet. Through the analysis of the white water sample, when the metering of N-(2-hydroxyl-3-trimethylammonium chloride) propyl chitosan is 0.54mg / g dry pulp, CaCO 3 The retention rate was 51%. The retention rate of fine fibers and soluble colloidal carbohydrates is 42%.

Embodiment 3

[0015] Embodiment 3: molecular weight is 11 * 10 4 , N-(2-hydroxy-3-trimethylammonium chloride) propyl chitosan with a substitution degree of 93% is made into an aqueous solution, and added to a beating degree of 54-56 0 In the reed slurry of SR, when the dosage of N-(2-hydroxy-3-trimethylammonium chloride) propyl chitosan is 6.7 mg / g dry pulp, the water filtration performance is increased by 20-25%.

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Abstract

This invention discloses an application of N-(2-hydroxyl-3-trimethyl) propyl ammonia chloride deacety chitin as the retention aid and filter aid agents in paper making which molecular weight is 30000-300000 and substituting degree is 35%-98%. This invention takes deacetylated chitin quaternary ammonium salt as the retention and filter aid agents in paper making with the advantages of increasing operation speed of paper-making machines in neutral and alkali paper making, reducing clean water concentration and reducing pollution of pollutant water.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to the application of N-(2-hydroxy-3-trimethylammonium chloride) propyl chitosan as a retention and drainage aid for papermaking. Background technique [0002] At present, the commonly used straw pulp papermaking retention and drainage aids mainly include cationic polyacrylamide and cationic starch. The former is a synthetic polymer. Although the price is low and the performance is good, it has disadvantages such as difficult degradation and heavy environmental load. Therefore, the research and application of natural polymers will become the first choice in the future. Natural starch has been used in the papermaking industry for thousands of years. Today, its cationic modified products are widely used as retention aids, but there are also some defects, such as large dosage, cumbersome operation, and unsatisfactory retention and drainage effects. With a large room for expans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/10D21H17/24
Inventor 杜予民黎厚斌
Owner WUHAN UNIV