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Cationic organic particles and preparation and application thereof

A technology of organic particles and cations, which is applied in the direction of water repellent addition, paper, textiles and papermaking, etc., to achieve good retention and drainage effects, good biocompatibility and biodegradability, and high surface positive charge density.

Inactive Publication Date: 2011-06-01
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on the cationic particle retention system, and the current work is devoted to the development of new cationic particles with smaller particle size, larger specific surface area, and stronger interaction between particles and the retention mechanism.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Crush the bleached softwood pulp with a pulverizer, pass through a 20-mesh sieve, and take 20 g of the absolutely dry pulp. Add 160ml of sulfuric acid with a mass concentration of 64% (acid slurry ratio 8.0, ml / g) and mix at 45°C. The reaction is carried out under mechanical stirring. After 30 minutes of reaction, the suspension is diluted 10 times with deionized water to terminate the reaction. . The product was washed repeatedly with deionized water by centrifugation to pH 5.0. Put the centrifuged product into a dialysis bag (molecular cut-off of 12000-14000) and dialyzed with flowing deionized water for several days to a constant pH value to obtain a nanocrystalline cellulose suspension. The suspension after dialysis was treated with an ultrasonic oscillator for 10 minutes. To avoid the accumulation of products due to heat, the treatment was carried out in an ice water bath.

[0030] (2) Place 100 mL of 6% by mass nanocrystalline cellulose suspension in a three-ne...

Embodiment 2

[0034] (1) Weigh 6g of microcrystalline cellulose (MCC) into an Erlenmeyer flask, add the required amount of water (to make the total volume of the final mixed solution 200ml) into the Erlenmeyer flask, and then add 2ml buffer to adjust the solution The pH value of the cellulase is 6-7, then add cellulase, the cellulase dosage is 20000IU / g absolutely dry raw material, put in a shaker, adjust the temperature to 50℃, the shaking speed is 126r / min, react for 48h to make the cellulose Enzymatic hydrolysis occurs. After the reaction, the sample was taken out and centrifuged. A colloidal suspension of nanocrystalline cellulose is obtained. The cellulase used is a neutral cellulase produced and sold by Hersbit Biotechnology Co., Ltd., and its filter paper enzyme activity is 20,000 to 40,000 IU / g.

[0035] (2) Prepare a suspension of nano-microcrystalline cellulose with a mass concentration of 6% from the nano-microcrystalline cellulose prepared in step (1), take 100 mL and place it in...

Embodiment 3

[0039] As described in Example 1, the difference is that the raw material is bleached hardwood kraft pulp.

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PUM

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Abstract

The invention relates to cationic organic particles for a microparticle retention and drainage aid system, preparation and application thereof. The preparation of the cationic organic particles comprises the following steps of: preparing nano-microcrystalline cellulose by an acid hydrolysis method or a bioenzyme hydrolysis method by taking wood pulp, microcrystalline cellulose or cotton as a raw material; reacting 1 to 12 percent of nano-microcrystalline cellulose suspension with cationic reagents such as 3-chloro-hydroxypropyltrimethylammonium chloride, 3-chloro-hydroxypropyltriethylammoniumchloride or 2,3-epoxypropyltrimethylammonium chloride and the like in 5 to 17 percent of sodium hydroxide with stirring at the temperature of between 50 and 120 DEG C for 2 to 6h, and then dialyzing to obtain cation-modified nano-microcrystalline cellulose suspension. 0.05 to 2.0 percent of the product is added and serves as a retention and drainage aid to make paper when the cationic organic particles are applied in the microparticle retention and drainage aid system. The cationic organic particles for the microparticle retention and drainage aid system have the characteristics of large specific surface area, high surface charge density, good retention and drainage aid effect and the like.

Description

(1) Technical field [0001] The invention relates to a cationic organic particle used in a papermaking particle retention and drainage aid system and a preparation and application method thereof, belonging to the field of pulping and papermaking. (2) Background technology [0002] The paper industry is constantly developing in the direction of high-speed, continuous and large-scale, which puts forward higher requirements for retention and drainage technology. Due to the lack of wood resources, the recycling rate of waste paper is getting higher and higher, coupled with the world-wide water shortage and pollution prevention requirements, papermaking must close the recycled water, resulting in an increase in the content of fine particles in the pulp. The added papermaking retention and drainage aids need to have strong shear resistance and salt resistance. Common structure retention and drainage aids cannot meet the needs and cannot function well. [0003] The particle retention and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/25D21H17/11D21H21/16
Inventor 徐清华刘娜李宗全秦梦华傅英娟
Owner QILU UNIV OF TECH
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