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Cellulose fiber modification method, modified cellulose fibers and application

A cellulose fiber modification technology, applied in the field of cellulose fiber modification and modified cellulose fiber, can solve the problems of unconsidered chemical bonding interface force, high production cost, strong toxicity, etc.

Active Publication Date: 2017-01-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the patent CN1970876A provides a method for preparing hydrophobic fibers, using surface ATRP technology to realize the controllability of the grafted chain length of cellulose fibers, but ATRP requires the use of transition metal catalysts and toxic organic amine co-catalysts. The process of removing these catalyst and co-catalyst residues after branch modification is complex and costly
Other such methods mostly have defects such as numerous operation steps, many types of reagents, strong toxicity, high production cost, and difficulty in practical application.
[0006] In addition, the modified cellulose fibers in the prior art improve the hydrophobicity of cellulose fibers by introducing hydrophobic graft chains, that is, improve the interfacial compatibility between cellulose fibers and composite materials by improving the physical properties of cellulose fibers and interfacial force, without considering the chemical bonding between cellulose fibers and polymer materials to improve the interfacial force between the two

Method used

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  • Cellulose fiber modification method, modified cellulose fibers and application
  • Cellulose fiber modification method, modified cellulose fibers and application
  • Cellulose fiber modification method, modified cellulose fibers and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] Example 1 Ring-opening polymerization of styrene oxide

[0076] Weigh 20.5g of styrene oxide and 0.576g of potassium tert-butoxide initiator into a pre-dried reactor with a volume of 100mL, put in a magnet, fill it with nitrogen and exhaust oxygen for 10 minutes, seal it, and place it at a constant temperature of 95°C Anionic ring-opening polymerization was carried out by heating in a water bath for 24 hours. Then the temperature was lowered to 60° C., 2 g of methanol was added, and the reaction was terminated by stirring for 10 minutes.

Embodiment 2

[0077] Example 2 Preparation of styrene oxide grafted modified cellulose fibers

[0078] Dry the wood fiber in vacuum at 80°C for 24h, and then continue vacuum drying at 100°C for about 2h to reach a constant weight. Weigh 27.0 g of the above-mentioned dry wood fiber, add it to an ethanol solution of sodium ethoxide (which contains 4.1 g of sodium ethoxide and 54.0 g of ethanol), stir at room temperature for 24 hours, and vacuumize at 65 ° C to remove ethanol and the trace moisture, and then vacuum-dried at 100°C for 2 hours. Under nitrogen environment, take 25.0g of sodium alkoxide pretreated and dried fibers into a pre-dried reaction bottle, repeat vacuuming / nitrogen 3 times, remove the air, seal, and inject 10.0g of dehydrated and dried fibers with a syringe. Styrene was added to the above reactor, nitrogen gas was passed for 10 minutes, mechanically stirred at room temperature for 8 hours, so that the styrene oxide monomer was uniformly distributed on the fiber, and then ...

Embodiment 3

[0079] Example 3 Preparation of styrene oxide-allyl glycidyl ether grafted modified cellulose fibers

[0080]Dry the wood fiber in vacuum at 80°C for 24h, and then continue vacuum drying at 100°C for about 2h to reach a constant weight. Weigh 30.0 g of the above-mentioned dry wood fiber, add it to an ethanol solution of potassium ethylate (which contains 4.5 g potassium ethylate and 60.0 g ethanol), stir at room temperature for 24 hours, and vacuumize at 65 ° C to remove ethanol and carried trace moisture, and then vacuum-dried at 100°C for 2 hours. Under nitrogen environment, take 25.0g of pretreated and dried fiber by potassium alkoxide into a pre-dried reaction bottle, repeat vacuuming / nitrogen three times, remove the air, seal it, and put 7.5g of dehydrated and dried styrene oxide Mix well with 2.5g allyl glycidyl ether, then add the above-mentioned epoxy monomer mixture into the above-mentioned reactor with a syringe, feed nitrogen for 10min, and mechanically stir for 10...

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Abstract

The invention discloses a cellulose fiber modification method, modified cellulose fibers prepared according to the method and application of the modified cellulose fibers. The method includes: pretreating cellulose fibers with alkoxide, drying, mixing with epoxy monomers, stirring, allowing reaction under heating, removing the epoxy monomers in a reaction system after reaction is finished, cleaning residues, and drying to obtain the modified cellulose fibers. The modified cellulose fibers are applied to filling modification of polymer materials. The cellulose fiber modification method has advantages of simplicity, safety, low cost and improvement of interfacial compatibility and interfacial force between the modified cellulose fibers and the polymer materials. The modified cellulose fibers are excellent in fiber dispersity, and the polymer materials adopting the modified cellulose fibers for filling modification are remarkably improved in water resistance.

Description

technical field [0001] The invention relates to surface modification of cellulose fibers, in particular to a method for modifying cellulose fibers, the prepared modified cellulose fibers and applications thereof. Background technique [0002] Natural cellulose fiber has received more and more attention as a green and environmentally friendly renewable resource, especially wood fiber, which is biodegradable, environmentally friendly, and has good mechanical properties. It is an ideal reinforcing fiber and can be used for filling modified polymerization material, so as to improve the toughness, strength and other properties of polymer materials. [0003] However, the hydroxyl-rich structure of natural cellulose fibers endows them with strong hydrophilicity, which greatly limits their application in filling modified polymer materials. On the one hand, most polymer materials are hydrophobic, and the strong hydrophilicity of cellulose fibers makes it difficult to disperse unifor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M14/04C08L67/06C08L1/02C08J3/24
Inventor 陈晓农刘合艳周莹赵彩新郑萌吴奇佳禹
Owner BEIJING UNIV OF CHEM TECH
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