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

A technology of nano-silica and propylammonium chloride, which is applied in textiles and papermaking, inorganic compound addition, papermaking, etc., can solve the problems of heavy environmental load, poor paper evenness, and difficult degradation, and reduce the The concentration of white water, the reduction of sewage pollution, and the effect of small amount of use

Inactive Publication Date: 2005-05-18
WUHAN UNIV
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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

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 , degree of substitution is 93%, concentration of 0.1wt% N-(2-hydroxyl 3-trimethyl) propyl ammonium chloride chitosan aqueous solution, N-(2-hydroxyl-3-trimethyl) propyl chloride The add-on of ammonium chitosan aqueous solution is 0.32wt% relative to the dry pulp in terms of N-(2-hydroxyl-3-trimethyl) propyl ammonium chloride chitosan; stir for 10 seconds, then add concentration 0.04 wt% SiO2 (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-trimethyl) propylammonium chloride chitosan aqueous solution, adding 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 hydroxyl 3-trimethyl) propyl ammonium chloride chitosan dosage is 2.5mg / g absolute dry pulp, silicon dioxide is 0.14mg / g absolute When the pulp is dry, its drainage performance is improved by 20-26%.

Embodiment 3

[0017] Embodiment 3: the molecular weight is 10 * 10 4 , the N-(2 hydroxyl 3-trimethyl) propyl ammonium chloride chitosan that substitution degree is 60% is mixed with 0.2wt% solution, joins beating degree and is 38-42 ° SR, pH is 7-8, Concentration is in the reed slurry of 0.3wt%, 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) colloidal solution, when N-(2 hydroxyl 3-trimethyl) propyl ammonium chloride chitosan consumption is 3.2mg / g dry pulp, silicon dioxide consumption is 0.14mg / g dry pulp, the drainage performance of the pulp is increased by 22-25%.

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Abstract

The present invention discloses the use of N-(2-hydroxy-3-trimethyl) propyl ammonium chloride chitosan and nanometer silicon dioxide as papermaking retention and filter aid. In condition of pulp slurry pH of 7-8, the retention and filter aid raises the water filtering performance of straw pulp slurry of beating degree of 38-50 deg SR by 15-26 %, raises the fine fiber and hemi-cellulose retaining rate by 30-50 %, and makes the CaCO3 retaining rate reach 80-89 %. Under the same flocculating effect on CaCO3 suspension, the chitosan quarternary salt has consumption 4-8 % that of 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 hydroxy 3-trimethyl) propyl ammonium chloride 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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IPC IPC(8): D21H17/21D21H17/68D21H21/10
Inventor 杜予民黎厚斌
Owner WUHAN UNIV
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