Nano xylan-based graft copolymer and preparation method and application thereof

A technology of graft copolymer and xylan, which is applied in the field of nano-xylan-based graft copolymer and its preparation, can solve the problem that the production conditions of new biomass wood preservatives cannot be reached, and the anti-corrosion of wood materials has not been widely used. It does not have bactericidal properties and anti-corrosion properties and other problems, and achieves significant social and economic benefits, strong bactericidal properties and anti-corrosion properties, and enhances the effect of bacteriostatic properties.

Active Publication Date: 2020-10-30
BEIHUA UNIV
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Problems solved by technology

[0003] However, at present, xylan is mainly used in the fields of pharmaceuticals, sewage treatment, papermaking additives, thermoplastic materials and food additives, and has not been widely used in the anticorrosion of wood materials.
Compared with the most widely used wood preservatives in the world plus chromium copper arsenate preservative (CCA) and ammonia-soluble copper quaternary ammonium (ACQ), xylan has not particularly obvious anti-corrosion and anti-mold effects, and its stability is relatively poor , does not have strong bactericidal and antiseptic properties, and cannot meet the actual production conditions of new biomass wood preservatives

Method used

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  • Nano xylan-based graft copolymer and preparation method and application thereof
  • Nano xylan-based graft copolymer and preparation method and application thereof
  • Nano xylan-based graft copolymer and preparation method and application thereof

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preparation example Construction

[0029] The invention provides a kind of preparation method of nano-xylan-based graft copolymer, comprising the following steps:

[0030] Mixing xylan and lye, mixing the resulting mixture with ethanol, and obtaining nano-xylan after precipitation;

[0031] Mixing the nano-xylan and the first part of the first initiator to perform a first esterification reaction to obtain an intermediate;

[0032] Mixing the intermediate with a dispersant and a catalyst, adding a second part of the first initiator to the resulting mixed material, and performing a second esterification reaction to obtain nano-xylan-based ATRP initiator molecules;

[0033] The nanometer xylan-based ATRP initiator molecule, the second initiator, a ligand, a quaternary ammonium salt monomer, an organic solvent and a metal catalyst are mixed for a grafting reaction to obtain a nanometer xylan-based graft copolymer.

[0034] In the present invention, unless otherwise specified, the required preparation materials are...

Embodiment 1

[0060] Prepare nano-xylan-based graft copolymers according to the following synthesis process:

[0061]

[0062] Add 1 g of xylan to 100 mL of NaOH solution with a mass concentration of 5%, dissolve it at 50°C, adjust the pH value to 5 with dilute sulfuric acid with a mass concentration of 15%, add three times the volume of absolute ethanol to precipitate, and filter with suction Carry out freeze-drying afterward, obtain nano-xylan, the particle diameter of the prepared nano-xylan is 77.35nm;

[0063] Put 1g of nano-xylan into a 50mm petri dish, then put the petri dish into a chromatographic cylinder containing 2mL of 2-bromoisobutyryl bromide, place it in the dark at 20°C for 16h, and perform the first esterification reaction After the reaction, the obtained reaction mixture was washed successively with distilled water, ethanol, dichloromethane and n-hexane respectively, and dried in a vacuum oven at 30°C to constant weight to obtain an intermediate;

[0064] Disperse 1.0...

Embodiment 2

[0067]

[0068] Add 1 g of xylan to 100 mL of 10% NaOH solution, dissolve it at 60 ° C, adjust the pH value to 5.5 with dilute sulfuric acid with a mass concentration of 10 %, add four times the volume of absolute ethanol to precipitate, and freeze-dry after suction filtration to obtain Nano xylan, the particle size of the prepared nano xylan is 45.99nm;

[0069] Put 1.5g nano-xylan into a 50mm petri dish, then put the petri dish into a chromatography tank containing 3mL 2-bromo-2-methylpropionyl bromide, and place it in the dark at 30°C for 20h. Carrying out the first esterification reaction, washing the obtained reaction mixture with distilled water, ethanol, dichloromethane and n-hexane respectively after the reaction, and drying in a vacuum oven at 40°C to constant weight to obtain the intermediate;

[0070] Disperse 1.0 g of the intermediate in 100 mL of DMF, ultrasonically disperse for 10 min, add DMAP (3 g), then cool to 0 ° C in an ice-water bath, and then add 2-bro...

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Abstract

The invention provides a nano xylan-based graft copolymer and a preparation method and application thereof, and belongs to the technical field of wood preservation. Firstly, nano xylan is prepared bytaking xylan as a raw material; meanwhile, by combining the space structure of the nano xylan, a quaternary ammonium salt monomer is grafted onto nano-xylan through an ATRP (Atom Transfer Radical Polymerization) 'from-main-chain grafting method' to prepare a nano-xylan-based grafted copolymer, namely quaternary ammonium groups with good bactericidal performance are grafted onto hydroxyl groups ona nanometer xylan main chain by chemical modification, so that the nano xylan is endowed with a wider application field; the prepared nano xylan quaternary ammonium-based graft copolymer has strong bactericidal performance and corrosion resistance, can be used as a natural biological preservative to perform preservative treatment on wood, has important significance in effectively utilizing naturalrenewable resources and reducing environmental pollution, opens an innovative thought for industrially utilizing plant resources such as forestry and agricultural residues, and has remarkable socialand economic benefits.

Description

technical field [0001] The invention relates to the technical field of wood preservation, in particular to a nano-xylan-based graft copolymer and its preparation method and application. Background technique [0002] Xylan is derived from biomass such as natural plants, and can be extracted from agricultural and forestry wastes such as corncobs, bran, bagasse, corn stalks, peanut shells, and cottonseed shells. Xylan has a certain antiseptic effect, is a natural biological preservative, and is a rich renewable resource in nature. It mainly exists in the hemicellulose of plant cells in nature, accounting for 35% of the dry weight of plant cells. It is a high molecular substance composed of xylose linked by β-1,4 glycosidic bonds. Xylan itself has the characteristics of strong antibacterial, green and non-toxic. It has incomparable advantages over traditional wood preservatives. It has a wide range of raw materials, is non-toxic and harmless, and can be naturally degraded witho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F226/04C08F226/02B27K3/50A01N33/12A01N43/16A01P1/00A01P3/00
CPCC08F251/00B27K3/50A01N33/12A01N43/16C08F2438/01B27K2240/20C08F226/04C08F226/02
Inventor 庞久寅姜贵全程泽琦刘思佳沈浩
Owner BEIHUA UNIV
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