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Use of N-(2-hydroxy-3-trimethyl) propyl ammonium chloride chitosan and nano silicon dioxide

A technology of nano-silica and trimethylammonium chloride, applied in textiles and papermaking, adding inorganic compounds, papermaking, etc., can solve the problems of poor paper evenness, heavy environmental load, and the influence of shear force , to achieve the effect of reducing sewage pollution, reducing the concentration of white water, and strong resistance to shearing force

Inactive Publication Date: 2006-11-15
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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.
Natural starch has been used in the paper industry for thousands of years, and today its cationic modified products are widely used as retention aids, but there are also some defects, such as large dosage, poor paper fixation, and easy to produce machine fouling; chitosan The quaternary ammonium salt has a high positive charge, which can generate an electrostatic interaction with the negative charge of the carboxyl group on the cellulose, further strengthen the force between it and the fiber and the filler, and improve the retention rate of the fine fiber and filler particles, but the unit system also has Its shortcomings, such as the evenness of the paper sheet is not ideal, and the retention and drainage aid is obviously affected by the shear force

Method used

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  • Use of N-(2-hydroxy-3-trimethyl) propyl ammonium chloride chitosan and nano silicon dioxide
  • Use of N-(2-hydroxy-3-trimethyl) propyl ammonium chloride chitosan and nano silicon dioxide
  • Use of N-(2-hydroxy-3-trimethyl) propyl ammonium chloride chitosan and nano silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: Adding relative dry pulp 20% CaCO in beating degree is 38 ° SR, concentration is the reed slurry of 0.1wt% 3 (average particle size: 2.69μm, specific surface area: 41684cm 2 / g) solid powder, the molecular weight is 19×10 after stirring 4 , a degree of substitution of 93%, a concentration of 0.1wt% N-(2-hydroxyl-3-trimethylammonium chloride) propyl chitosan aqueous solution, N-(2-hydroxyl-3-trimethylammonium chloride) propyl The add-on of base chitosan aqueous solution is 0.32wt% relative to dry pulp in terms of N-(2-hydroxyl-3-trimethylammonium chloride) propyl chitosan; stir for 10 seconds, then add concentration 0.04wt %Silicon dioxide (specific surface area is 350--450m 2 / g, average particle size 14nm) colloidal solution (addition amount is 0.07 mg silica / per gram dry pulp), CaCO 3 The retention rate is 85%. The retention rate of fine fibers and soluble colloidal carbohydrates is 37%.

Embodiment 2

[0016] Embodiment 2: molecular weight is 7 * 10 4 , a degree of substitution of 53%, a concentration of 0.02wt% N-(2-hydroxyl-3-trimethylammonium chloride) propyl chitosan aqueous solution, added to the degree of beating 38-42 ° SR, a concentration of 0.5wt% In the reed slurry, stir for about 10 seconds, then add a concentration of 0.01wt% silicon dioxide (specific surface area is 350--450m 2 / g, average particle size 25nm) colloidal solution, in N-(2-hydroxy-3-trimethylammonium chloride) propyl chitosan consumption is 2.5mg / g dry pulp, silicon dioxide is 0.14mg / g When the pulp is dry, its water drainage performance is increased by 20-26%.

Embodiment 3

[0017] Embodiment 3: the molecular weight is 10 * 10 4 , the N-(2-hydroxyl-3-trimethylammonium chloride) propyl chitosan with a degree of substitution of 60% is formulated with a 0.2wt% solution, and when the beating degree is 38-42 ° SR, the pH is 7-8 , concentration is 0.3wt% in the reed slurry, stir about 10 seconds, then add concentration and be 0.4wt% silicon dioxide (specific surface area is 350--450m 2 / g, average particle size 13-27nm) colloid solution, when N-(2-hydroxyl-3-trimethylammonium chloride) propyl chitosan consumption is 3.2mg / g dry pulp, silicon dioxide consumption is 0.14 mg / g dry pulp, the drainage performance of the pulp is increased by 22-25%.

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Abstract

The invention discloses the use of N-(2-hydroxy-3-trimethylammonium chloride) propyl chitosan and nano silicon dioxide as retention and drainage aids for papermaking. When the pH of the slurry is 7-8, the additive can improve the drainage performance of straw pulp with a beating degree of 38-50°SR by 15%-26%, and increase the retention rate of fine fibers and hemicellulose by 30%. -50% to CaCO 3 The retention rate is as high as 80% -89%. on CaCO 3 On the premise that the flocculation effect of the suspension is similar, the dosage of the chitosan quaternary ammonium salt is about 4%-8% of the cationic starch.

Description

technical field [0001] The invention belongs to the technical field of chemical industry and relates to a novel papermaking retention aid filter system - N-(2-hydroxyl-3-trimethylammonium chloride) propyl chitosan-nano silicon dioxide. The additive has a wide range of applications and can be used in acidic systems, especially for medium and alkaline papermaking systems. It has a good retention of fine fibers and soluble, colloidal carbohydrates and inorganic filler particles in non-wood pulp such as reed pulp and straw pulp. 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, but there are disadvantages such as difficult degradation and heavy environmental load. Natural starch has been used in the paper industry for thousands of years, and today its cationic modified ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/10D21H17/68D21H17/21
Inventor 杜予民黎厚斌
Owner WUHAN UNIV