A kind of modified cellulose fiber and its preparation method and application

A cellulose fiber modification technology, applied in plant fiber, fiber treatment, textiles and paper making, etc., can solve problems such as poor mechanical properties, and achieve the effects of less side reactions, easy realization, and mild reaction conditions

Active Publication Date: 2021-11-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mechanical properties of cellulose fiber-filled UP composites are poor compared to glass fiber-filled UP composites

Method used

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  • A kind of modified cellulose fiber and its preparation method and application
  • A kind of modified cellulose fiber and its preparation method and application
  • A kind of modified cellulose fiber and its preparation method and application

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Experimental program
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preparation example Construction

[0044] A second aspect of the present invention provides a method for preparing modified cellulose fibers, the method comprising the following steps:

[0045] Step 1. Disperse the cellulose fibers in a solvent.

[0046] According to the present invention, in step 1, the cellulose fibers are added into the solvent, preferably under the condition of stirring, the cellulose fibers are dispersed in the solvent to obtain a dispersion mixture.

[0047] According to the present invention, in step 1, stirring is carried out at room temperature (15-30° C.), and the stirring time is 1-5 hours, more preferably 1-3 hours, for example, 2 hours.

[0048] In the present invention, the furan group-containing compound is used to modify the cellulose fiber, preferably a solvent capable of dissolving the furan group-containing compound.

[0049] According to the present invention, in step 1, the solvent is selected from one or both of chloroform and N,N-dimethylformamide (DMF).

[0050] In the...

Embodiment 1

[0109] Embodiment 1 Furoyl chloride modified cellulose fiber

[0110] Take 15.62g of cellulose fibers and 159.48g of chloroform into a 500mL pre-dried round bottom flask, add a magnet, fill with nitrogen and exhaust the air for 2 minutes, seal the bottle, and stir at room temperature for 2 hours until the cellulose fibers are fully dispersed in the chloroform solvent.

[0111] Add 6.43g of furoyl chloride dissolved in 10mL of chloroform and 5.03g of pyridine dissolved in 10mL of chloroform, fill with nitrogen and exhaust the air for 2min, seal the seal, and heat at 70°C for 24h.

[0112] After the reaction, the reaction mixture was placed in a centrifuge tube and centrifuged at 4500 rpm for 10 min to remove chloroform; then 50 mL of chloroform was added to mix thoroughly, and the chloroform was removed by centrifugation. The above process was repeated 3 times. Dry to constant weight to obtain modified cellulose fibers.

Embodiment 2

[0113] Embodiment 2 furan methylamine modified cellulose fiber

[0114] Take 17.86g of cellulose fibers and 186.48g of N,N-dimethylformamide into a 500mL pre-dried round-bottomed flask, add magnets, fill with nitrogen and exhaust the air for 2 minutes, seal the seal, and stir at room temperature for 2 hours until the cellulose fibers are in the fully dispersed in chloroform solvent.

[0115] Add 104.58g of N,N-carbonyldiimidazole dissolved in 200mL of N,N-dimethylformamide, inflate with nitrogen and exhaust the air for 2min, then seal, and heat at 60°C for 3h. The container was cooled to room temperature, and 64.32 g of methylfurylamine dissolved in 120 mL of N,N-dimethylformamide was added, and the container was sealed after purging with nitrogen for 2 minutes, and heated at 60°C for 5 hours.

[0116] After the reaction, the reaction mixture was placed in a centrifuge tube and centrifuged at 4500 rpm for 10 minutes to remove N,N-dimethylformamide; then 90 mL of deionized wat...

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Abstract

The invention discloses a modified cellulose fiber and a preparation method and application thereof, as well as a thermally reversible cross-linked resin and a preparation method thereof, wherein the modified cellulose fiber is composed of a furan group-containing compound and a cellulose fiber The reaction obtains that the furan group-containing compound contains furan groups and functional groups that can react with hydroxyl groups on the surface of the cellulose fibers, which endow the modified cellulose fibers with the activity of D-A cyclization addition crosslinking reaction. The modified cellulose fibers are blended with unsaturated polyester and hot-pressed to obtain a thermoreversible cross-linked resin, wherein the modified cellulose fibers endow the thermoreversible cross-linked resin with degradability, and in addition, the resin contains D-A The cross-linking bridge bonds strengthen the interfacial bonding force between the modified cellulose fibers and the unsaturated polyester, and at the same time endow the resin with thermal reversibility, so that the thermally reversible cross-linked resin has good mechanical properties and thermoplasticity.

Description

technical field [0001] The invention relates to the modification of cellulose fibers, in particular, to a modified cellulose fiber and a method for preparing thermally reversible cross-linked resin by using the modified cellulose fiber. Background technique [0002] Unsaturated polyester (UPR) is often used as a matrix material for fiber-reinforced composites due to its good processability, excellent chemical and mechanical properties, low density, and low price. The reinforcing material is mainly glass fiber , The resulting composite material is called FRP (FRP). FRP has the characteristics of light weight and high strength, and is widely used in aerospace, decorative buildings, railways, sports materials, building materials, sanitary ware, sanitation engineering and other industries. [0003] However, with the rapid development of the FRP industry, a large amount of FRP waste is generated, which causes waste of resources and pollutes the environment. Therefore, the reaso...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D06M13/352C08L67/06C08L1/02C08J3/24D06M101/06
CPCC08J3/246C08J2367/06C08J2401/02D06M13/352D06M2101/06
Inventor 陈晓农赵彩新任怀森桂起林石淑先
Owner BEIJING UNIV OF CHEM TECH
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