Preparation process of modified cellulose nanofibril/polymer composite material

A technology of nanofibrils and composite materials, applied in the field of plant-based nanofiber composite materials, which can solve problems such as poor compatibility and cumbersome composite processes, and achieve the effects of improving mechanical properties, simplifying production processes, and better transmitting and absorbing external stress

Pending Publication Date: 2021-12-07
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of poor compatibility between hydrophilic CNF and polymer matrix and cumbersome composite process, the present invention provides a preparation process of modified cellulose nanofibrils / polymer composite material. The hydrogen bonding force between the small filaments, and the high shear and high temperature of the twin-screw extruder realize the dissociation of the filaments and the simultaneous preparation of the modified CNF / polymer composite material, which greatly reduces the production energy consumption and cost , to simplify the production process of composite materials; in addition, the modified CNF has better compatibility with polymer matrix, which improves the mechanical properties of composite materials and reduces the dependence and use of petroleum resources, with low-carbon environmental protection, high performance superior advantage

Method used

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  • Preparation process of modified cellulose nanofibril/polymer composite material
  • Preparation process of modified cellulose nanofibril/polymer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Prepare the modified CNF / PP composite material according to the following method, the steps are as follows:

[0026] 1. Hydrophobic modification of dissolving pulp by acetylation

[0027] ①Weigh 200g of dissolved pulp board, shred it, soak it in deionized water for 4 hours, beat it according to QB / T3703-1999, and dry it at room temperature for later use;

[0028] ② Accurately weigh 10 g of the dissolving slurry in step ①, place it in a round bottom flask equipped with a condensation reflux device, add 100 ml of glacial acetic acid, 0.5 g of concentrated sulfuric acid and 9.5 g of acetic anhydride, and mix well;

[0029] ③ Place the mixture in step ② in a water bath at 50°C for 1 hour; after the reaction, centrifuge and wash repeatedly at 5000r / min until the supernatant is neutral;

[0030] ④ Measure the moisture content of the product in step ③ and store it in a refrigerator at 5°C for later use;

[0031] 2. Wet primary mixing of acetylated modified dissolving pulp / PP...

Embodiment 2

[0040] Prepare the modified CNF / HDPE composite material according to the following method, the steps are as follows:

[0041] 1. acetylation modification of NBKP

[0042] Accurately weigh 10g of bleached softwood kraft pulp (NBKP) that has been decomposed and dried at room temperature to constant weight, put it in a round bottom flask equipped with a condensing reflux device, add 100ml of glacial acetic acid, 0.5g of concentrated sulfuric acid and 9.5g of acetic anhydride , Reaction at 50°C for 1h. After the reaction, centrifuge and wash repeatedly at 5000r / min until the supernatant is neutral. The moisture content of the product was measured and stored in a 5°C refrigerator for later use.

[0043] 2. Wet primary mixing of acetylated modified NBKP / HDPE composites

[0044]Accurately weigh 1.5g of acetylated modified NBKP in step (1), adjust the slurry concentration to 2%, then add 40g of high-density polyethylene powder, 1.2g of maleic anhydride grafted polyethylene powder, ...

Embodiment 3

[0048] Prepare the modified CNF / PA6 composite material according to the following method, the steps are as follows:

[0049] 1. Acetylation modification of dissolving pulp

[0050] Accurately weigh 10g of dissolving slurry that has been decomposed and dried at room temperature to constant weight, place it in a round bottom flask equipped with a condensing reflux device, add 100ml of glacial acetic acid, 0.5g of concentrated sulfuric acid and 9.5g of acetic anhydride, and react at 50°C for 1h. After the reaction, centrifuge and wash repeatedly at 5000r / min until the supernatant is neutral. The moisture content of the product was measured and stored in a 5°C refrigerator for later use.

[0051] 2. Wet primary mixing of acetylated modified dissolving pulp / PA composite material

[0052] Accurately weigh 1.5g of the acetylated modified dissolving slurry in step (1), adjust the slurry concentration to 1.5%, then add 40g of nylon 6, 0.8g of silane coupling agent KH560, magnetically...

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Abstract

The invention discloses a preparation process of a modified cellulose nanofibril / polymer composite material, and belongs to the technical field of plant-based nanofiber composite materials. The raw materials comprise a polymer, a compatibilizer, paper pulp fibers, concentrated sulfuric acid, glacial acetic acid and acetic anhydride. Compared with the prior art, the preparation process has the beneficial effects that the hydrogen bond binding force among the fibrils is reduced by carrying out modification pretreatment on the plant fibers, and the separation of the fibrils and the synchronous preparation of the modified cellulose nanofibril / polymer composite material are realized by virtue of high shearing and high temperature of the double-screw extruder, so that the production energy consumption is greatly reduced, the production process of the composite material is simplified, and the process is a composite material production technology with a very good industrial application prospect; in addition, the modified CNF has good compatibility with a polymer matrix, improves the mechanical properties of the composite material, reduces the dependence and use on petroleum resources, and has the advantages of low carbon, environmental protection and excellent performance.

Description

technical field [0001] The invention relates to a preparation process of a modified cellulose nanofibril / polymer composite material, and belongs to the technical field of plant-based nanofiber composite materials. [0002] technical background [0003] Cellulose nanofibrils (CNF) have the characteristics of high strength, high aspect ratio, low thermal expansion coefficient, and degradability, and have great application potential in the field of polymer green reinforcing fillers. Compared with cellulose nanocrystals (CNC), its interwoven three-dimensional network structure can better transmit and disperse loads, endow the material with a certain degree of toughness, limit the violent movement of polymer molecules to a certain extent, and improve its thermodynamic properties , is a nano-reinforced material with great development potential. In recent years, extracting CNF from biomass resources and using its performance advantages different from CNC to prepare polymer composit...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/06C08L77/02C08L51/06C08L1/12C08K5/5435B29B9/06
CPCC08L23/12C08L23/06C08L77/02B29B9/06C08L2205/16C08L51/06C08L1/12C08K5/5435
Inventor 李群段林娟段燕胡恒王徵
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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