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Chemical mechanical pulping method for cotton haulm raw material

A chemical machinery and raw material technology, applied in the field of pulping and papermaking, can solve the problems of low whiteness, high dustiness, difficult industrialization, etc., and achieve the effects of simple process flow, high pulping whiteness and improving whiteness.

Inactive Publication Date: 2007-08-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The researches that have been done so far include chemical cooking and chemical mechanical pulping, etc. Among them, the yield of chemical pulping is low, which cannot meet the current shortage of fiber raw materials and the requirements of making full use of resources; but the existing chemical mechanical pulping exists Problems such as low whiteness and high dustiness
At present, all-round rod pulp is mainly used to produce high-strength corrugated paper, paper bag paper and seedling paper, etc. The research on high-grade paper is difficult to industrialize due to problems such as difficulty in improving whiteness and high dustiness.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The cotton stalk raw material is pulverized with a pulverizer, rinsed with cold water, soaked in hot water at 85°C for 50 minutes to dissolve and wash out the hot water melt, and the obtained raw material is extruded in stage I through a screw extruder with a compression ratio of 4:1. Add NaOH 4.5% at the outlet (for absolute dry raw materials, the same below), H 2 o 2 1.0% and chemical additives F-10.03%, metal ion chelating agent EDTA 0.6% and bleaching stabilizer Na 2 SiO 3 0.1%, MgSO 4 0.2%, at a temperature of 85°C and a concentration of 20%, conduct the first-stage pre-impregnation for 30 minutes, and use a refiner with a gap of 0.4mm to perform the first-stage refining, refining at a concentration of 25% and 60°C in a high-consistency storage tank Keep the reaction for 15min in the middle, carry out the extrusion of stage II with a screw extruder with a compression ratio of 4:1, add NaOH 1.5%, H 2 o 2 4.5% and chemical additive F-1 0.04%, metal ion chela...

Embodiment 2

[0023] Grind the cotton stalk raw material with a pulverizer, wash it with cold water, soak it in hot water at 98°C for 25 minutes to dissolve and wash out the hot water melt, and then extrude the obtained raw material through a screw extruder with a compression ratio of 4:1. , add NaOH 4.0%, H at the outlet 2 o 2 1.0% and chemical auxiliary agent F-1 0.03%, organometallic ion chelating agent TX-20C 0.02% and bleaching stabilizer 1#0.03%, carry out I stage pre-impregnation 45min at temperature 75 ℃, concentration 25%, with gap as A 0.6mm refiner is used for the first-stage refining, and the refining is kept in a high-concentration storage tank for 20 minutes at a concentration of 25% and 60°C, and the screw extruder with a compression ratio of 4:1 is used for the second-stage extrusion , add NaOH 0.8%, H 2 o 2 5.0% and chemical additive F-1 0.05%, organometallic ion chelating agent TX-20C 0.04% and bleach stabilizer 1# 0.03%, carry out chemical impregnation in stage II fo...

Embodiment 3

[0025] The cotton stalk raw material is pulverized with a pulverizer, rinsed with cold water, soaked in hot water at 80°C for 50 minutes to dissolve and wash out the hot water melt, and the obtained raw material is extruded in stage I through a screw extruder with a compression ratio of 5:1. Add NaOH 4.5%, H at the outlet 2 o 2 0.8% and chemical auxiliary agent F-1 0.04%, organometallic ion chelating agent TX-20C 0.01% and bleaching stabilizer 1#0.03%, at temperature 80 ℃, under concentration 18%, carry out I stage pre-impregnation 40min, with gap as A 0.55mm refiner is used for stage I refining. Refining is kept in a high-concentration storage tank for 10 minutes at a concentration of 25% and 60°C, and a screw extruder with a compression ratio of 4:1 is used for stage II extrusion. , adding NaOH 4.0%, H 2 o 2 3.5% and chemical additive F-1 0.03%, organometallic ion chelating agent TX-20C 0.02% and bleaching stabilizer 1# 0.03%, carry out chemical impregnation in stage II...

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Abstract

The invention discloses a chemical mechanical pulping method which uses cotton stalk as material, wherein the invention processes the first grinding after the first screw protrusion pre-immersion to replace present APMP technique which comprises two screw protrusion immersion followed with at least two sections of grinding, then holds the pulp after first grinding process for some time to process chemical reaction, at the same time, the invention uses novel additive to replace traditional metal ion chelating agent, Na2SiO3 and MgSO4. Compared with present APMP technique, the invention has low cost and high strength to be used to produce high-level paper.

Description

technical field [0001] The invention relates to a pulping and papermaking method, in particular to a chemical mechanical pulping method for cotton stalk raw materials. Background technique [0002] As an extremely important agricultural economic crop in my country, cotton is widely distributed. After a long period of continuous evolution and development, my country's cotton fields are gradually concentrating in the Yellow River Basin, the Yangtze River Basin and Xinjiang's three major cotton-producing regions, becoming the second largest cotton-producing country in the world. Data show that in 2004 my country's cotton output was 6.32 million tons. Cotton stalks are the main residue of cotton, and their production volume is very considerable. But for a long time, most of the cotton stalks have been used as fuel or even piled up and rotted directly, causing serious waste of resources and environmental pollution. Therefore, how to rationally utilize cotton stalk resources has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C3/26D21C3/02D21H21/08D21H21/32D21H17/12D21H17/66
Inventor 田英姿陈克复朱文远莫立焕李军
Owner SOUTH CHINA UNIV OF TECH
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