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Surface treatment method of super-hydrophobic multifunctional cellulose-based material

A cellulose-based, multi-functional technology, applied in the direction of fiber raw material treatment, fiber treatment, wood treatment, etc., can solve the problems of wood expansion, appearance, strength, structure and function damage, deformation of cellulose products, etc., to increase hardness, Good for recycling and high efficiency

Active Publication Date: 2020-02-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The essence of cellulose is a macromolecular chain of glucose units connected by 1,4β glycosidic bonds, and the 2, 3, and 6 positions of the glucose units contain 3 active hydroxyl groups, so unmodified cellulose products usually have a hydrophilic surface , the water contact angle is below 120°, and the hydrophobicity is poor, which will cause the water molecules to quickly penetrate into the interior of the cellulose product when the cellulose product encounters water (rainwater, water vapor, etc.), resulting in the appearance and strength of the cellulose product. , structure and function damage, for example, when ordinary paper encounters water, its strength is greatly reduced, and ordinary wood seeps water, causing wood expansion, deformation, mildew and moths and other hazards

Method used

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  • Surface treatment method of super-hydrophobic multifunctional cellulose-based material
  • Surface treatment method of super-hydrophobic multifunctional cellulose-based material
  • Surface treatment method of super-hydrophobic multifunctional cellulose-based material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In this embodiment, the superhydrophobic multifunctional cellulose-based material surface treatment method is as follows:

[0032] 1. Take 2ml of thioglycolic acid, 12ml of acetic anhydride, 8ml of 36% acetic acid, and 0.03ml of concentrated sulfuric acid in a small beaker. Cut 1.5g of wood into small pieces (1cm×1cm×0.3cm) and submerge them completely, seal them away from light and place them in an oven at 45°C for 12 hours, wash them with water, and dry them to obtain wood chips modified with mercapto groups on the surface;

[0033] 2. First, dissolve the pentafluorophenol-modified benzene isonitrile monomer a (10.39 mg) and the olefin-terminated palladium (II) catalyst b (2.2 mg) in anhydrous THF (2.5 mL). The reaction was carried out at 55°C in an oil bath for 6h. After cooling, centrifuging and washing, the yellow solid obtained is polypentafluorophenol isonitrile helical polymer with a degree of polymerization of 10.

[0034] 3. Add 0.5 g of mercapto-modified wo...

Embodiment 2

[0036] In this embodiment, the superhydrophobic multifunctional cellulose-based material surface treatment method is as follows:

[0037] 1. Take 5.02mmol of 3-mercaptopropyltrimethoxysilane in 26.901g of EtOH / H 2 In the O (95 / 5, w / w) system, add AcOH to adjust the pH value of the solution to 3.5. Weigh 2.6g (1cm×1cm×1cm) of wood block and dry it at 120°C for 2h to obtain mercapto-modified wood;

[0038] 2. Dissolve pentafluorophenol-modified benzene isonitrile monomer a (103.9mg) and alkenyl-terminated palladium(II) catalyst b (2.2mg) in anhydrous THF (2.5mL) in an oil bath at 55°C Under reaction 12h. After cooling, centrifuging and washing, the obtained yellow solid is polypentafluorophenol isonitrile helical polymer with a degree of polymerization of 100.

[0039] 3. Add 1.5 g of mercapto-modified wood, 0.15 g of polypentafluorophenol isonitrile, and 10 mg of photoinitiator α, α-dimethoxy-α-phenylacetophenone in sequence to the polymerization bottle, and place in 8 ℃ co...

Embodiment 3

[0041] In this embodiment, the superhydrophobic multifunctional cellulose-based material surface treatment method is as follows:

[0042] 1. Immerse 3g of cleaned wood blocks (1cm×1cm×1cm) into 58g of 5% 3-mercaptopropyltriethoxysilane ethyl acetate (EA) solution, and react in the solution for 8h at room temperature to obtain mercapto-modified Sexual blocks;

[0043] 2. Pentafluorophenol-modified benzene isonitrile monomer a (103.9 mg), olefin-terminated palladium (II) catalyst b (2.2 mg) was dissolved in anhydrous THF (2.5 mL), and reacted at 55 ° C in an oil bath for 12 h . After cooling, centrifuging and washing, the obtained yellow solid is polypentafluorophenol isonitrile helical polymer with a degree of polymerization of 100.

[0044]3. Add 1.5g of the above-mentioned mercapto-modified wood, 0.15g of polypentafluorophenol isonitrile, 2mg of photoinitiator α, α-dimethoxy-α-phenylacetophenone, and seal it to the polymerization bottle In a constant temperature bath at 25...

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Abstract

The invention discloses a surface treatment method of a super-hydrophobic multifunctional cellulose-based material. The surface treatment method comprises the following steps: firstly, carrying out treatment by using a chemical agent to ensure that a thiol group capable of carrying out click reaction is modified on the surface of a base material; bonding a hydrophobic helical polymer containing anethylene-linkage terminal group to the surface of the material by utilizing click chemistry reaction, and carrying out drying to obtain the base material with surface-modified helical polymer. Multiple functions quickly given to the surface of the cellulose-based material are as follows: superhydrophobicity, chiral separation, chiral identification and asymmetric catalysis. The functions of abrasion resistance, waterproof performance, oil absorption performance and the like can be given. Due to trace modification, great improvement of the performance of the surface of cellulose products is realized, and the surface treatment method has the advantages of effectiveness, convenience, quickness and the like.

Description

technical field [0001] The invention relates to the technical field of surface treatment, in particular to a surface treatment method for a superhydrophobic multifunctional cellulose-based material. Background technique [0002] There are many types of natural cellulose-based products, such as filter paper, wallpaper, wrapping paper, wood, cotton, and cellulose-based aerogels, hydrogels, membranes and other forms that exist in our lives and scientific research. The essence of cellulose is a macromolecular chain of glucose units connected by 1,4β glycosidic bonds, and the 2, 3, and 6 positions of the glucose units contain 3 active hydroxyl groups, so unmodified cellulose products usually have a hydrophilic surface , the water contact angle is below 120°, and the hydrophobicity is poor, which will cause the water molecules to quickly penetrate into the interior of the cellulose product when the cellulose product encounters water (rainwater, water vapor, etc.), resulting in the...

Claims

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Application Information

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IPC IPC(8): B27K3/34B27K3/50B27K5/00D06M13/513D06M15/37D21H19/24D21H19/14D06M101/06
CPCB27K3/34B27K3/50B27K5/00B27K2240/70D06M13/513D06M15/37D06M2101/06D21H19/14D21H19/24
Inventor 王慧庆沈晓飞钱浩张燕宋磊张铭涛谢开云
Owner HEFEI UNIV OF TECH
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