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Method for preparing high-substitution and high-viscosity sodium carboxymethyl cellulose from bagasse

A technology of sodium carboxymethyl cellulose and bagasse fiber is applied in fiber raw material processing, textile and paper making, etc., and can solve the problems of high raw material cost of sodium carboxymethyl cellulose, complicated pretreatment process, low yield and the like, Achieve the effect of increasing the amorphous area, lowering the production cost and improving the reactivity

Inactive Publication Date: 2011-08-31
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing sodium carboxymethyl cellulose with high degree of substitution and high viscosity with bagasse to solve the problem of high raw material cost, complicated pretreatment process, serious pollution and low yield of sodium carboxymethyl cellulose problems, expand the utilization of bagasse fiber, and protect the ecological environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 50g of bagasse crushed to 30 meshes into the grinding barrel of the stirring mill, then add stainless steel balls with a diameter of 6mm, the volume ratio of the balls to the material is 3:1, adjust the speed to 400 rpm and the temperature of the constant temperature water bath at 60°C, and cover plate. Take it out after 1.0 hour to obtain activated bagasse fiber.

[0023] Weigh 30g of activated bagasse fiber in a 1000mL beaker, add 90mL of 0.5% H 2 SO 4 The solution was boiled under normal pressure for 1h, filtered and washed with water. Add 90 mL of 0.5% NaOH solution to the acid-treated plant fibers, boil for 1 h under normal pressure, filter, and wash with water. Add 90mL of sodium hypochlorite to hydrogen peroxide bleach solution with a mass ratio of 1:1.1 to the alkali-treated plant fibers, stir and bleach at room temperature for 20min, and add 90mL of dilute hydrochloric acid with a molar concentration of 0.1mol / L to acidify for 8min after fully washing wi...

Embodiment 2

[0027] Add 50g of bagasse crushed to 50 meshes into the grinding cylinder of the stirring mill, then add stainless steel balls with a diameter of 6mm, the volume ratio of the balls to the material is 3:1, adjust the rotating speed to 400 rpm and the temperature of a constant temperature water bath at 50°C, and cover it plate. Take it out after 1.0 hour to obtain activated bagasse fiber.

[0028] Weigh 30g of activated bagasse fiber in a 1000mL beaker, add 90mL of 0.5% H 2 SO 4 The solution was boiled under normal pressure for 1h, filtered and washed with water. Add 90 mL of 0.5% NaOH solution to the acid-treated plant fibers, boil for 1 h under normal pressure, filter, and wash with water. Add the alkali-treated plant fibers to 90 mL of sodium hypochlorite and hydrogen peroxide in a bleaching solution with a mass ratio of 1:2, stir and bleach at room temperature for 20 minutes, and then add 90 mL of dilute hydrochloric acid with a molar concentration of 0.1 mol / L for acidif...

Embodiment 3

[0032] Add 50g of bagasse crushed to 45 meshes into the grinding barrel of the stirring mill, then add stainless steel balls with a diameter of 6mm, the volume ratio of the balls to the material is 3:1, adjust the speed to 400 rpm and the temperature of the constant temperature water bath at 40°C, and cover plate. Take it out after 1.0 hour to obtain activated bagasse fiber.

[0033] Weigh 30g of activated bagasse fiber in a 1000mL beaker, add 120mL of 1.0% H 2 SO 4 The solution was boiled under normal pressure for 2h, filtered and washed with water. Add 120 mL of 1.0% NaOH solution to the acid-treated plant fibers, boil for 2 hours under normal pressure, filter, and wash with water. Add 120mL of sodium hypochlorite to hydrogen peroxide bleach solution with a mass ratio of 1:1.6 to the alkali-treated plant fiber, stir and bleach at room temperature for 30min, and then add 120mL of dilute hydrochloric acid with a molar concentration of 0.5mol / L to acidify for 10min. , fully...

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Abstract

The invention discloses a method for preparing high-substitution and high-viscosity sodium carboxymethyl cellulose from bagasse. The method comprises the following steps of: pretreating bagasse fibers through ball milling; refining activated bagasse fibers; and etherifying the refined bagasse fibers. Since the bagasse fibers are pretreated by the ball milling in the invention, a lignin protectionlayer is damaged and a crystal structure of cellulose is changed, an amorphous region of bagasse cellulose is increased, reaction activity of the bagasse cellulose is improved, high viscosity is realized by adding a crosslinking agent, the substitution of the prepared sodium carboxymethyl cellulose reaches over 1.5 and the viscosity reaches over 1,585mPa.S through a series of subsequent process method and optimization of control parameters, and the method has the advantages of low production cost, simple process and environmental friendliness.

Description

technical field [0001] The invention relates to a method for preparing sodium carboxymethyl cellulose with high degree of substitution and high viscosity by using bagasse. Background technique [0002] Carboxymethyl cellulose (CMC) is a derivative with an ether structure obtained by chemically modifying natural cellulose, and its sodium salt is usually used. Because the aqueous solution of sodium carboxymethyl cellulose has the functions of thickening, bonding, film forming, protective glue, moisture retention, emulsification and suspension, it is widely used in petroleum, natural gas, textile, printing and dyeing, papermaking, ceramics, construction, food, pharmaceuticals, etc. Widely used in the industry, it is the product with the largest output, the widest application and the most convenient use among the cellulose ethers. The degree of substitution of carboxymethyl cellulose sodium currently on the market is between 0.6-1.2. With the continuous expansion of applicatio...

Claims

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Application Information

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IPC IPC(8): C08B11/12C08B1/06D21C5/00
Inventor 黄祖强陈渊胡华宇张燕娟
Owner GUANGXI UNIV
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