Preparation method for cellulose acetate porous microspheres and product applying preparation method

A technology of cellulose acetate and porous microspheres, which is applied in the field of polymer materials to achieve the effect of efficient utilization of resources

Active Publication Date: 2014-04-16
ZHENGZHOU TOBACCO RES INST OF CNTC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under normal circumstances, the cellulose acetate microspheres prepared by the above method are often non-porous or the pore volume is small, and the pore structure is not easy to control, and its application is limited.

Method used

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  • Preparation method for cellulose acetate porous microspheres and product applying preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 5.0 g of discarded cellulose acetate tow samples (wherein the triacetin content is 8.0%, and the degree of substitution of cellulose acetate is 2.5) in 95.0 g of ethyl acetate to obtain a cellulose acetate solution; add 5.0 g of An aqueous solution of 5% ammonium bicarbonate and 1% polyvinyl alcohol was emulsified with an ultrasonic cell pulverizer for 3 minutes to obtain a W / O emulsion; the above W / O emulsion was slowly added to 800 g of an aqueous solution containing 0.2% polyvinyl alcohol, and the machine was operated at 400rpm Stir to obtain a W / O / W emulsion, volatilize the organic solvent at room temperature, solidify, filter, wash and dry to obtain porous cellulose acetate microspheres.

[0032] Microsphere BET specific surface area 9.2 m 2 / g, the particle size is 50-1200 microns, the average particle size is 300 microns, the average pore size is 2.2 microns, the microsphere pore volume is 3.1mL / g, and the triacetin content in the microspheres is 3.5%. ...

Embodiment 2

[0035] Blend 8.0 g of discarded cellulose acetate tow samples (the content of triacetin is 8.0%, and the degree of substitution of cellulose acetate is 2.5) and 2.0 g of triacetin are dissolved in 90.0 g of ethyl acetate to obtain Cellulose acetate solution; Add 5.0 g of aqueous solution containing 5% sodium bicarbonate and 1% polyvinyl alcohol to it, and use an ultrasonic cell pulverizer to emulsify for 10 minutes to obtain a W / O emulsion; Slowly add the above W / O emulsion to 800 g containing In an aqueous solution of 0.2% polyvinyl alcohol and 1% acetic acid, mechanically stirred at 600 rpm to obtain a W / O / W emulsion, the organic solvent was volatilized at room temperature, solidified, filtered, washed and dried to obtain porous cellulose acetate microspheres.

[0036] Microsphere BET specific surface area 7.8 m 2 / g, the particle size is 50-450 microns, the average particle size is 220 microns, the average pore size is 1.2 microns, the microsphere pore volume is 7.1mL / g, an...

Embodiment 3

[0039] 1 part of glyceryl triacetate and 4 parts of cellulose acetate (degree of substitution: 2.4) were spirally blended, extruded and granulated to obtain cellulose acetate mixed with glyceryl triacetate, wherein triacetin accounted for 20%. Take 5.0g of the above cellulose acetate mixed with triacetin and dissolve it in 95.0g of ethyl acetate / dichloromethane mixed solvent (mass ratio 1:1) to obtain a cellulose acetate solution; add 10.0g of cellulose acetate containing 10% bicarbonate Ammonium, 1% polyvinyl alcohol aqueous solution, emulsification to obtain W / O emulsion; slowly add the above W1 / O emulsion to 800g aqueous solution containing 0.2% polyvinyl alcohol, stir at 400rpm to obtain W / O / W emulsion, heat for 40 o C volatilize the organic solvent, solidify, filter, wash and dry to obtain cellulose acetate porous microspheres.

[0040] figure 1 It is a scanning electron micrograph of the porous cellulose acetate microspheres prepared in this example, and the microspher...

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Abstract

The invention discloses a preparation method for cellulose acetate porous microspheres and a product applying the preparation method. The method comprises the following steps: dissolving cellulose acetate containing glycerol triacetate into an organic solvent; and then adding a pore-foaming agent aqueous solution to obtain a water in oil type W / O emulsifiable solution; finally, adding the W / O emulsifiable solution into an outer aqueous phase aqueous solution to remove the organic solvent so as to obtain the cellulose acetate porous microspheres. The cellulose acetate porous microsphere provided has average particle diameter of 20.0-2000 micrometers, BET specific surface area of 1.0-50.0 m<2> / g, pore diameter of 50-20000 nm, pore volume of 0.5-10.0 mL / g and glycerol triacetate content of 1.0-20.0 percent. The porous microspheres have porous structures which are communicated to one another, and are large in pore volume; the pore structure and the particle diameter are adjustable. The structure is favorable for being applied to the fields of adsorptive separation and water treatment and biomedicine.

Description

[0001] Technical field: [0002] The invention belongs to the field of polymer materials, in particular to a method for preparing porous cellulose acetate microspheres and products prepared by the method. Background technique: [0003] Cellulose acetate is an important cellulose derivative, which is the acetate of cellulose. Cellulose acetate is non-toxic and biodegradable. Among them, cellulose acetate with a degree of substitution of acetyl between 2.0 and 2.7 is called cellulose diacetate, and it is widely used as cigarette filter tow (acetate fiber tow for tobacco). [0004] In order to make the filter rod made of cellulose acetate tow rolled with suitable hardness, a certain amount of glycerol triacetate is often applied on the surface of the tow in the industry, and the dosage is usually 4.0% to 12.0% of the mass of the cellulose acetate tow. . During the filter rod processing process, it is inevitable to produce waste acetate fiber tow for cigarettes. However, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/16C08J3/12C08L1/12C08K5/103C08J9/08
Inventor 孙培健聂聪杨松孙学辉王宜鹏彭斌赵乐颜权平刘惠民
Owner ZHENGZHOU TOBACCO RES INST OF CNTC
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