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Method for preparing bleaching bamboo pulp cellulose water absorbing material

A technology of cellulose and water absorption, which is applied in fiber raw material treatment, pulp beating method, pulp bleaching, etc. It can solve the problems of complex operation, high cost, and lengthy process, so as to improve the reaction ability of graft copolymerization and increase the liquid absorption performance Effect

Inactive Publication Date: 2011-05-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, previous experiments have proved that chemical swelling pretreatment methods often have complex operations, lengthy procedures, long experiment time, huge investment, high cost of solvent recovery and recycling, and certain environmental impacts caused by chemical swelling wastewater. Disadvantages such as burden

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: The preparation process is as follows:

[0016] A. Preparation of fiber raw material bleached pulp

[0017] Dalong Bamboo in Xishuangbanna, Yunnan Province undergoes kraft cooking, followed by continuous four-stage bleaching of oxygen delignification-chlorine dioxide-hydrogen peroxide-chlorine dioxide; the kraft cooking conditions are 21% of the sulfide degree of sodium sulfide, sodium hydroxide The amount of alkali used is 21%, the heating time is 30min, the holding time is 100min, and the holding temperature is 165°C. The liquid ratio of the absolute dry raw material of Dalong bamboo to the total reaction liquid is 1:4.5; the oxygen delignification bleaching condition is that the amount of alkali used is 3.0%. , the temperature is 90°C, the reaction time is 75min, and the pulp concentration is 10% by mass; the first chlorine dioxide bleaching condition is 1.5% of the amount of chlorine used for chlorine dioxide, the bleaching time is 150min, the bleachin...

Embodiment 2

[0025] Embodiment 2: The preparation process is as follows:

[0026] A. Preparation of fiber raw material bleached pulp

[0027] Dalong Bamboo in Xishuangbanna, Yunnan Province is boiled with sulfate, followed by continuous oxygen delignification-chlorine dioxide-hydrogen peroxide-chlorine dioxide bleaching in four stages; the sulfate condition is that the degree of sulfide of sodium sulfide is 21%, and sodium hydroxide is used The amount of alkali is 21%, the heating time is 30min, the holding time is 85min, and the holding temperature is 160°C. The liquid ratio of the dry raw material of Dalong bamboo to the total reaction liquid is 1:4.5; the oxygen delignification bleaching condition is 3.0% of the alkali amount, The temperature is 90°C, the reaction time is 75min, and the pulp concentration is 10% by mass; the first stage of chlorine dioxide bleaching condition is 1.5% of the amount of chlorine used for chlorine dioxide, the bleaching time is 150min, the bleaching tempera...

Embodiment 3

[0035] Embodiment 3: The preparation process is as follows:

[0036] A. Preparation of fiber raw material bleached pulp

[0037] Dalong Bamboo in Xishuangbanna, Yunnan Province undergoes kraft cooking, followed by continuous four-stage bleaching of oxygen delignification-chlorine dioxide-hydrogen peroxide-chlorine dioxide; the kraft cooking conditions are 24% of the sulfide degree of sodium sulfide, sodium hydroxide The amount of alkali used is 24%, the heating time is 30min, the holding time is 70min, and the holding temperature is 170°C. The liquid ratio of the dry raw material of Dalong bamboo to the total reaction liquid is 1:4.5; the oxygen delignification bleaching condition is 3.0% of the alkali amount , the temperature is 90°C, the reaction time is 75min, and the pulp concentration is 10% by mass; the first chlorine dioxide bleaching condition is 1.5% of the amount of chlorine used for chlorine dioxide, the bleaching time is 150min, the bleaching temperature is 70°C, a...

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Abstract

The invention relates to a method for preparing a bleaching bamboo pulp cellulose water absorbing material. The method is characterized by comprising the following preparation steps of: stewing bleaching bamboo pulp by a sulfate process; carrying out subsequent four-section bleaching with oxygen delignification, chlorine dioxide, peroxide and chlorine dioxide to prepare the bleaching bamboo pulp fiber; defibrinating and pretreating the bleaching bamboo pulp fiber by a PFI beater; carrying out graft copolymerization synthesis on the defibrinated bleaching bamboo pulp fiber with an aqueous solution polymerization method, i.e. taking ammonium persulfate as initiator, and taking N-N'-bisacrylamide as a crosslinker; meanwhile, and finishing the graft copolymerization synthesis by taking crylicacid and acrylamide as the monomers; and precipitating and washing the copolymerization composite with absolute ethyl alcohol, freezing, drying, grinding, then freezing, drying, and sealing to obtainthe finished product. The water absorbing material prepared with the method has high water absorbing efficiency and can effectively develop and utilize the bleaching bamboo pulp cellulose.

Description

technical field [0001] The invention relates to a technical method for producing water-absorbing materials by using bleached bamboo pulp cellulose. Background technique [0002] Today, there are many types of absorbent materials. According to the source of raw materials, there are mainly two series, namely, natural polymers (including starch, cellulose and other natural products) and petroleum product-based water-absorbing materials (including polyacrylate, polyvinyl alcohol, polyoxyethylene) Department, etc.). As raw materials for water-absorbing materials, cellulose and starch are both polyhydroxy natural compounds, which can react with a variety of low molecules to synthesize liquid-absorbing materials with different characteristics. Compared with the raw materials of petroleum product-based water-absorbing materials, natural polymer raw materials, especially cellulose and starch, have a wide range of sources, a wide variety, and low prices, and synthetic water-absorbin...

Claims

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Application Information

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IPC IPC(8): C08F251/02C08F220/06C08F220/56D21C9/14D21C5/00D21D1/02
Inventor 高欣张恒陈克利李同再宁选起苗山
Owner KUNMING UNIV OF SCI & TECH
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