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Method for preparing cellulose-based hydrogel by pretreating bagasse bleached pulp through mechanical ball milling

A mechanical ball milling, cellulose-based technology, applied in the field of natural polymers, can solve the problems of large operation loss of materials and complicated process flow, and achieve the effect of reducing the degree of polymerization and crystallinity, and improving the chemical reactivity and the availability of medicines.

Active Publication Date: 2019-07-19
GUANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of this method is complicated, and high-speed emulsifiers and rotary evaporators are required, which has a large operating loss on materials.

Method used

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  • Method for preparing cellulose-based hydrogel by pretreating bagasse bleached pulp through mechanical ball milling
  • Method for preparing cellulose-based hydrogel by pretreating bagasse bleached pulp through mechanical ball milling
  • Method for preparing cellulose-based hydrogel by pretreating bagasse bleached pulp through mechanical ball milling

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Experimental program
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Effect test

Embodiment 1

[0034] A method for preparing cellulose-based hydrogel by pretreating bagasse bleached pulp by mechanical ball milling, such as figure 1 Shown is the preparation flow chart of cellulose-based hydrogel. The specific preparation operations are as follows:

[0035] (1) Pretreatment of the bagasse bleached pulp: the water content of the bagasse bleached pulp is dried to below 5%, crushed by a pulverizer, and passed through a 20-mesh sieve. A double planetary ball mill is used to pre-process the bagasse bleached pulp by ball milling. The sieved material and zirconia balls are placed in a 500mL zirconia ball milling tank at a mass ratio of 10:600. The zirconia balls are of two types. Zirconia balls with diameters of 10mm and 5mm respectively, and the mass ratio of 10mm zirconia ball to 5mm zirconia ball is 1:4, the control speed is 300n / min, the ball milling time is 240min, and the ball is taken out after the mechanical ball milling is completed. Material separation. Use NaOH / H 2 O 2 ...

Embodiment 2

[0040] A method for preparing cellulose-based hydrogel by pretreating bagasse bleached pulp by mechanical ball milling, the specific operation is as follows:

[0041] (1) Pretreatment of the bagasse bleached pulp: the water content of the bagasse bleached pulp is dried to below 5%, crushed by a pulverizer, and passed through a 20-mesh sieve. A double planetary ball mill is used to pre-process the bagasse bleached pulp by ball milling. The sieved material and zirconia balls are placed in a 500mL zirconia ball milling tank at a mass ratio of 10:500, and 10mm zirconia balls and 5mm oxidized The mass ratio of the zirconium balls is 1:3, the control speed is 300n / min, and the ball milling time is 360min. After the mechanical ball milling is completed, the balls are taken out and the balls are separated. Use 5%NaOH / 0.7%H 2 O 2 The mixed aqueous solution (mass fraction) is soaked and washed with materials, washed with deionized water to neutrality, dried at 60 DEG C, and crushed to obta...

Embodiment 3

[0046] A method for preparing cellulose-based hydrogel by pretreating bagasse bleached pulp by mechanical ball milling, the specific operation is as follows:

[0047] (1) Pretreatment of the bagasse bleached pulp: the water content of the bagasse bleached pulp is dried to below 5%, crushed by a pulverizer, and passed through a 20-mesh sieve. A double planetary ball mill is used to pre-process the bagasse bleached pulp by ball milling. The sieved material and zirconia balls are placed in a 500mL zirconia ball mill at a mass ratio of 10:700, and 10mm zirconia balls are combined with 5mm oxide The mass ratio of the zirconium balls is 1:2, the control speed is 500n / min, and the ball milling time is 60min. After the mechanical ball milling is completed, the balls are taken out and the balls are separated. Use 5%NaOH / 0.7%H 2 O 2 The mixed aqueous solution (mass fraction) is soaked and washed with materials, washed with deionized water to neutrality, dried at 60 DEG C, and crushed to ob...

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Abstract

The invention discloses a method for preparing cellulose-based hydrogel by pretreating bagasse bleached pulp through mechanical ball milling. The method comprises the following steps: (1) pretreatingthe bagasse bleached pulp; (2) dissolving the pretreated bagasse cellulose; (3) conducting chemical crosslinking on cellulose; and (4) gelatinizing cross-linked fibers. Compared with a traditional preparation method for biogasse cellulose-based hydrogel, the preparation method adopts a pretreatment mode of mechanical ball milling, thus the polymerization degree and crystallinity of bagasse bleached pulp cellulose are reduced, the number of active hydroxyl groups in cellulose molecules is increased, the natural bagasse cellulose is directly dissolved in a sodium hydroxide / urea solution, homogeneous chemical crosslinking modification is performed on the bagasse cellulose, and the purpose of preparing the bagasse cellulose-based hydrogel is achieved. The bagasse cellulose-based hydrogel is prepared by taking the bagasse bleached pulp as a raw material and taking mechanical ball milling as a pretreatment reinforcing means, and has the advantages of high efficiency, simplicity in operation,environmental friendliness, mild reaction conditions and the like.

Description

Technical field [0001] The invention belongs to the technical field of natural polymers, and specifically relates to a method for preparing a cellulose-based hydrogel by pretreating bagasse bleached pulp by mechanical ball milling. Background technique [0002] With the increasing depletion of petroleum resources, how to develop and utilize natural polymer compounds in depth and breadth has become a topic of general concern to scholars at home and abroad. The main components of bagasse are cellulose 32 to 48%, hemicellulose 19 to 24%, lignin 23 to 32%, and ash content about 4%. It is a biomass resource rich in cellulose and very promising for application. . As the most precious natural renewable resource in nature, cellulose has the advantages of being cheap and easy to obtain, biodegradable, etc. The application of cellulose, a sustainable renewable resource, has attracted more and more attention. Cellulose can widely replace petrochemical raw materials. It has far-reaching si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08J3/24C08L1/02D21C9/00
CPCC08J3/075C08J3/24C08J2301/02D21C9/005D21C9/007
Inventor 冼学权黎演明李秉正唐培朵杜芳黎陈东
Owner GUANGXI ACAD OF SCI
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