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Novel high-strength uniform-strength cellulose microsphere preparation method

A cellulose microsphere, high-strength technology, applied in the field of materials, can solve problems such as poor mechanical properties of cellulose spherical materials, unsatisfactory mechanical properties, and inability to completely solve problems, and achieve easy production, low cost, Uniform intensity effect

Inactive Publication Date: 2018-11-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the mechanical properties of cellulose spherical materials are generally poor, and they are often easily compacted and broken during use.
Even if cross-linking is carried out after molding, this cross-linking reaction only occurs on the surface and cannot completely solve the problem
The reason is that due to the loose network structure of the prepared spherical cellulose material, there is no high-strength support point in the matrix, resulting in unsatisfactory mechanical properties.

Method used

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  • Novel high-strength uniform-strength cellulose microsphere preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Dissolve 5g of microcrystalline cellulose in 95ml of sodium hydroxide / urea solution at -5°C, then place the cellulose solution in an ice bath, add the crosslinking agent epichlorohydrin drop by drop, and mechanically stir at the same time at a speed of 10,000 rpm, stirring time 60min; after centrifuging and degassing the solution obtained in the previous step, use a syringe to draw 1ml of this solution as a dispersed phase, fix it in a syringe pump, use a syringe to draw 5ml of white mineral oil and add 0.25g of Span80 as a continuous phase, fix In another syringe pump, using a T-type microfluidic device, place the liquid outlet in 50ml of 5% Span80 white mineral oil solution, and prepare emulsions containing cellulose droplets of different particle sizes by adjusting the two-phase flow rate ; The emulsion was placed in an environment of 20 ° C for 8 hours, while magnetically stirring at 2000 rpm; and then 5% acidic solution was added to obtain regenerated cellulose micr...

Embodiment 2

[0028] Dissolve 6g of bamboo cellulose in 94ml of sodium hydroxide / urea solution at -5°C, then place the cellulose solution in an ice bath, add the crosslinking agent epichlorohydrin drop by drop, and mechanically stir at the same time at a speed of 10,000 rpm , stirring time 30min; after centrifuging and degassing the solution obtained in the previous step, use a syringe to draw 1ml of this solution as a dispersed phase, fix it in a syringe pump, use a syringe to draw 5ml of white mineral oil and add 0.25g of Span80 as a continuous phase, and fix it in Another syringe pump, using a T-type microfluidic device, placed the liquid outlet in 50ml of 5% Span80 white mineral oil solution, and prepared emulsions containing cellulose droplets of different particle sizes by adjusting the two-phase flow rate; The emulsion was placed in an environment of 20°C for 8 hours, and magnetically stirred at 2000 rpm at the same time; then the emulsion obtained in the previous step was heated to 7...

Embodiment 3

[0030] Dissolve 8g of microcrystalline cellulose in -5°C sodium hydroxide / urea 92ml solution, then place the cellulose solution in an ice bath, add the cross-linking agent ethylene glycol glycidyl ether drop by drop, and mechanically stir at the same time, the speed 10000 rpm, stirring time 45min; after centrifuging and degassing the solution obtained in the previous step, use 10ml of this solution as a dispersed phase, fix it on a syringe pump, use 90ml of white mineral oil and add surfactant 5gSpan80 as a continuous phase, and mechanically stir ( 2000 rpm) to emulsify this solution for 8 hours; then add the emulsion obtained in the previous step to 5% acidic solution to obtain regenerated cellulose microspheres.

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Abstract

The invention relates to a novel high-strength uniform-strength cellulose microsphere preparation method, and belongs to the technical field of materials. The preparation method includes first dissolving cellulose in an alkaline solvent; then placing the cellulose in an ice bath, adding a crosslinking agent dropwise, premixing the crosslinking agent with a cellulose solution to enable crosslinkingagent molecules to be evenly dispersed among cellulose molecules; utilizing the solution as a dispersed phase and white mineral oil as a continuous phase to prepare cellulose emulsion; after emulsification for a period, enabling the uniformly mixed crosslinking agent molecules and the cellulose molecules to have cross-linking reaction to form a stable cellulose gel sphere through auto polymerization in drops and then regenerate a cellulose microsphere. The results show that the cellulose microsphere prepared by the preparation method has high strength and uniform strength. The above results indicate that the microsphere prepared by the method has high uniform strength, is simple in process, wide in raw material source, easy to degrade, free of toxicity and good in biocompatibility, and greatly expands the application range of cellulose base materials.

Description

technical field [0001] The invention belongs to the technical field of materials, and relates to a new preparation method of novel high-strength and uniform-strength cellulose microspheres. Background technique [0002] In recent years, the depletion of non-renewable energy sources and environmental pollution have seriously affected human health and sustainable development. For this reason, natural polymer materials with wide sources, environmental friendliness, safety, non-toxicity and regeneration have attracted attention. Cellulose is the most abundant renewable biomass resource on the earth. It comes from a wide range of sources and has the characteristics of low cost, renewable, biodegradable and environmentally friendly. Cellulose is a straight-chain polysaccharide composed of β-D-glucose groups through 1-4 glycosidic bonds. There are three hydroxyl groups available for reaction on each glucose group. It is a polyhydroxy compound, which provides for the functional mod...

Claims

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Application Information

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IPC IPC(8): B01J13/06C08J3/09C08L1/02C08L1/04
CPCB01J13/06C08J3/092C08J3/097C08J2301/02C08J2301/04
Inventor 杜开峰乔亮智
Owner SICHUAN UNIV
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