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CN-122008372-A - Wood reinforcing agent and preparation method and application thereof

CN122008372ACN 122008372 ACN122008372 ACN 122008372ACN-122008372-A

Abstract

The invention belongs to the technical field of cultural relics restoration, and provides a wood reinforcing agent, a preparation method and application thereof. The wood reinforcing agent comprises the following components of 9-15 ppm of carbon quantum dots, 25-50 wt% of polyethylene glycol and the balance of solvent, wherein the surfaces of the carbon quantum dots contain amino and carboxyl. As the-NH 2 and-COOH functional groups on the surface of the Carbon Quantum Dots (CQDs) can form a large number of hydrogen bonds and covalent amide bonds with polyethylene glycol (PEG) and wood components, a three-dimensional cross-linked network is constructed, the wood reinforcing agent provided by the invention can be more firmly combined in the wood cell wall, so that migration and leakage of the PEG are effectively prevented, and a longer-lasting and stable reinforcing effect is provided. Because CQDs has high-efficiency antibacterial performance, the wood reinforcing agent can provide long-acting antibacterial and anti-corrosion protection for wooden cultural relics, which is not provided by the traditional PEG, inhibit microbial degradation and prolong the service life of the cultural relics.

Inventors

  • ZHAO XIAOQI
  • LI NAISHENG

Assignees

  • 国家文物局考古研究中心

Dates

Publication Date
20260512
Application Date
20260320

Claims (10)

  1. 1. A wood strengthening agent comprising the following concentrations of components: 9-15 ppm of carbon quantum dots, 25-50 wt% of polyethylene glycol and the balance of solvent; The surface of the carbon quantum dot contains amino and carboxyl.
  2. 2. The wood strengthening agent of claim 1, wherein the polyethylene glycol has a molecular weight of 1000 to 4000.
  3. 3. The wood reinforcing agent according to claim 1, wherein the preparation method of the carbon quantum dots comprises the steps of: Mixing an organic carbon source, an organic nitrogen source, polyethylene glycol and water, and performing microwave treatment to obtain the carbon quantum dots.
  4. 4. The wood reinforcing agent according to claim 3, wherein the molecular weight of the polyethylene glycol is 1000-4000 in the preparation process of the carbon quantum dots; the organic carbon source is polycarboxylic acid, and the polycarboxylic acid comprises citric acid and/or malic acid; The organic nitrogen source comprises one or more of urea and amino acid; The molar ratio of the organic nitrogen source to the organic carbon source is 4-35:1; The mass ratio of the organic carbon source to the polyethylene glycol is 3:1; The mass ratio of the organic carbon source to the water is 0.6:10mL.
  5. 5. The wood strengthening agent according to claim 3 or 4, wherein the power of the microwave treatment is 400 to 600w.
  6. 6. The wood reinforcing agent according to claim 3, further comprising mixing the obtained coke-like solid microwave treatment system with water, sequentially performing ultrasonic dispersion and centrifugation to remove insoluble substances and obtain a suspension, and sequentially performing dialysis and freeze-drying on the suspension to obtain the carbon quantum dots.
  7. 7. The wood reinforcement agent according to claim 6, wherein the ultrasonic dispersion time is 10-30 min, the centrifugal rotation speed is 9000-11000 rpm, the centrifugal rotation speed is 4-6 min, the molecular weight cut-off of a dialysis bag used for dialysis is 400-600 Da, the dialysis time is 36-60 h, and the freeze drying temperature is-40 ℃ and the freeze drying time is 36-60 h.
  8. 8. The method for preparing the wood reinforcing agent according to any one of claims 1 to 7, comprising the steps of: dispersing carbon quantum dots in part of water to obtain carbon quantum dot stock solution; Dispersing polyethylene glycol in the balance water to obtain a polyethylene glycol solution; and mixing the carbon quantum dot stock solution with a polyethylene glycol solution to obtain the wood reinforcing agent.
  9. 9. The method of claim 8, wherein the concentration of the carbon quantum dot stock solution is 240-360 ppm, and the concentration of the polyethylene glycol solution is 25-50wt%.
  10. 10. Use of the wood strengthening agent according to any one of claims 1 to 7 or the wood strengthening agent prepared by the preparation method according to any one of claims 8 to 9 in the protection of wooden relics.

Description

Wood reinforcing agent and preparation method and application thereof Technical Field The invention relates to the technical field of cultural relic restoration, in particular to a wood reinforcing agent and a preparation method and application thereof. Background Ocean effluent wooden relics (such as 'south China sea No. I' sunken ship) are precious physical evidence of ancient China ocean trade and shipbuilding technology. However, these cultural relics have undergone hundreds of years of high-salt, high-temperature and microbial attack on the seabed, and the lignocellulose molecular chains thereof are severely degraded, so that the mechanical strength is remarkably reduced, and the subsequent protection work is extremely challenged. At present, polyethylene glycol (PEG) is the most widely used and most classical reinforcing agent in the dewatering reinforcing protection of effluent woody cultural relics. PEG can penetrate into wood tissues to replace water molecules, so that the dimensional stability of cultural relics is improved, and the material and equipment cost is relatively low. However, only weak physical adsorption and hydrogen bonding effect exist between PEG molecules and wood components (cellulose, hemicellulose and lignin), and a strong and stable binding anchor point is lacked, so that the infiltrated PEG is easy to migrate and precipitate out of the wood when the ambient temperature and humidity change, the strengthening effect is not durable, and harmful crystals can be formed on the surface of the cultural relics. Disclosure of Invention In view of the above, the present invention aims to provide a wood strengthening agent, and a preparation method and application thereof. The wood reinforcing agent provided by the invention is not easy to migrate and leak. In order to achieve the above object, the present invention provides the following technical solutions: the invention provides a wood reinforcing agent, which comprises the following components in percentage by weight: 9-15 ppm of carbon quantum dots, 25-50 wt% of polyethylene glycol and the balance of solvent; The surface of the carbon quantum dot contains amino and carboxyl. Preferably, the molecular weight of the polyethylene glycol is 1000-4000. Preferably, the preparation method of the carbon quantum dots comprises the following steps: Mixing an organic carbon source, an organic nitrogen source, polyethylene glycol and water, and performing microwave treatment to obtain the carbon quantum dots. Preferably, in the preparation process of the carbon quantum dots, the molecular weight of the polyethylene glycol is 1000-4000; the organic carbon source is polycarboxylic acid, and the polycarboxylic acid comprises citric acid and/or malic acid; The organic nitrogen source comprises one or more of urea and amino acid; The molar ratio of the organic nitrogen source to the organic carbon source is 4-35:1; The mass ratio of the organic carbon source to the polyethylene glycol is 3:1; The mass ratio of the organic carbon source to the water is 0.6:10mL. Preferably, the power of the microwave treatment is 400-600W. Preferably, after the microwave treatment is finished, the method further comprises the steps of mixing the obtained coke-shaped solid microwave treatment system with water, sequentially performing ultrasonic dispersion and centrifugation to remove insoluble substances to obtain a suspension, and sequentially performing dialysis and freeze drying on the suspension to obtain the carbon quantum dots. Preferably, the ultrasonic dispersion time is 10-30min, the centrifugal rotating speed is 9000-11000 rpm, the centrifugal rotating speed is 4-6 min, the molecular weight cut-off of a dialysis bag used for dialysis is 400-600 Da, the dialysis time is 36-60 h, and the freeze drying temperature is-40 ℃ and the freeze drying time is 36-60 h. The invention also provides a preparation method of the wood reinforcing agent, which comprises the following steps: dispersing carbon quantum dots in part of water to obtain carbon quantum dot stock solution; Dispersing polyethylene glycol in the balance water to obtain a polyethylene glycol solution; and mixing the carbon quantum dot stock solution with a polyethylene glycol solution to obtain the wood reinforcing agent. Preferably, the concentration of the carbon quantum dot stock solution is 240-360 ppm, and the concentration of the polyethylene glycol solution is 25-50wt%. The invention also provides the application of the wood strengthening agent in the protection of wooden cultural relics or the wood strengthening agent prepared by the preparation method in the technical scheme. The invention provides a wood reinforcing agent. The wood reinforcing agent of the present invention has the following advantages: (1) As-NH 2 and-COOH functional groups on the surface of the Carbon Quantum Dots (CQDs) can form a large number of hydrogen bonds and covalent amide bonds with polyethylene glycol (PEG) and woo