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Preparation method of water absorbing material of industrial hemp stalk core cellulose

A technology of industrial hemp and cellulose, which is applied in the field of polymer materials, can solve problems such as application limitations of stalk core fibers, and achieve the effect of increasing liquid absorption performance and improving response ability

Inactive Publication Date: 2012-01-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Bast fiber has the advantage of its fiber length (in the range of 10-20mm [9] ), plays an important role in large-scale fiber manufacturing industries such as textiles, papermaking, and natural fiber composites; and the core fiber is limited by its length (about 0.5mm [9] ) in the fiber manufacturing industry has been greatly restricted

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of fiber raw material bleached pulp

[0025] The industrial hemp used is "Yunma No. 1" industrial hemp variety. The core of the hemp stalk is cooked by caustic soda-anthraquinone method, followed by oxygen delignification, chlorine dioxide-hydrogen peroxide three-stage bleaching to obtain "Yunma No. 1" stalk core bleached pulp fiber raw material, and the characteristics of the bleached pulp are as follows : Kappa value 3.8, viscosity value 1031dm 3 / kg, whiteness value 85.3% (ISO).

[0026] (2) Grinding (beating) pulp pretreatment process and method for industrial hemp stalk core bleached pulp fibers

[0027] In order to improve the reactivity of cellulose in fiber raw materials, the process of mechanical grinding (beating) is used to replace the swelling effect of one or several specific chemical reagents on cellulose. "The stalk core bleached pulp fiber is pretreated by grinding (beating), and the beating degree of the pulp is measured in real time ...

Embodiment 2

[0034] (1) Preparation of fiber raw material bleached pulp

[0035] The industrial hemp used is "Yunma No. 1" industrial hemp variety. The core of the hemp stalk is cooked by caustic soda-anthraquinone method, followed by oxygen delignification, chlorine dioxide-hydrogen peroxide three-stage bleaching to obtain "Yunma No. 1" stalk core bleached pulp fiber raw material, and the characteristics of the bleached pulp are as follows : Kappa value 6.5, viscosity value 1081dm 3 / kg, whiteness value 66.9% (ISO).

[0036] (2) Grinding (beating) pulp pretreatment process and method for industrial hemp stalk core bleached pulp fibers

[0037] In order to improve the reactivity of cellulose in fiber raw materials, the process of mechanical grinding (beating) is used to replace the swelling effect of one or several specific chemical reagents on cellulose. "The stalk core bleached pulp fiber is pretreated by grinding (beating), and the beating degree of the pulp is measured in real time ...

Embodiment 3

[0044] (1) Preparation of fiber raw material bleached pulp

[0045] The industrial hemp used is "Yunma No. 1" industrial hemp variety. The core of the hemp stalk is cooked by caustic soda-anthraquinone method, followed by oxygen delignification, chlorine dioxide-hydrogen peroxide three-stage bleaching to obtain "Yunma No. 1" stalk core bleached pulp fiber raw material, and the characteristics of the bleached pulp are as follows : Kappa value 0.9, viscosity value 967.3dm 3 / kg, whiteness value 90.7% (ISO).

[0046] (2) Grinding (beating) pulp pretreatment process and method for industrial hemp stalk core bleached pulp fibers

[0047] In order to improve the reactivity of cellulose in fiber raw materials, the process of mechanical grinding (beating) is used to replace the swelling effect of one or several specific chemical reagents on cellulose. "The stalk core bleached pulp fiber is pretreated by grinding (beating), and the beating degree of the pulp is measured in real time...

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Abstract

The invention relates to a technical process for manufacturing a water absorbing material by utilizing industrial hemp stalk core cellulose, belonging to the technical field of high molecular materials. The process of the invention comprises the following steps: (1) cooking an industrial hemp stalk core by caustic soda-anthraquinone (AQ), and then, carrying out oxygen delignification and chlorinedioxide-hydrogen peroxide bleaching in three sections to prepare the bleached pulp fiber of the industrial hemp stalk core; (2) grinding and pretreating the bleached pulp fiber by a mechanical beating machine, wherein the beating degree is 35-85 SR; (3) carrying out graft copolymerization on the bleached pulp fiber after grinding by using the aqueous solution polymerization method, wherein the graft copolymerization is completed by using ammonium persulfate and sodium bisulfite as an oxidation reduction initiating system, using N,N'-methylene-bisacrylamide as a cross-linking agent and using acrylic acid and acrylic amide as monomers; and (4) precipitating the copolymerization product with absolute ethyl alcohol, washing, freeze-drying, grinding, refreezing and sealing to obtain a finished product. The water absorbing material of the invention has high accessibility and water absorbing efficiency and can effectively develop and utilize the industrial hemp stalk core cellulose.

Description

technical field [0001] The invention relates to a technology for manufacturing water-absorbing materials by utilizing industrial hemp stalk core cellulose, and belongs to the technical field of polymer materials. 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 water-absorbing materials (including acrylate, polyvinyl alcohol, polyoxyethylene) Department, etc.) [1] . 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,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F251/02
Inventor 高欣张恒陈克利
Owner KUNMING UNIV OF SCI & TECH