Modified cellulose nanometer crystal, high-strength hydrogel material, preparation method and application

Abstract

The invention provides a modified cellulose nanometer crystal, a high-strength hydrogel material, a preparation method and an application. The modified cellulose nanometer crystal comprises a cellulose nanometer crystal body and methyl cellulose which is combined with the crystal body by an aldol condensation reaction, in the aldol condensation reaction, and the substitution degree of methyl cellulose is as follows: 0.002-0.1 hydroxyl radical in each glucose unit in a cellulose nanometer crystal is substituted. The high-strength hydrogel material is prepared by the following steps: 0.2-20 parts of methyl cellulose and 0.1-10 parts of the modified cellulose nanometer crystal are added into 100 parts of water in order to obtain mixed liquor, and stirring is carried out at a room temperaturein order to obtain the product. The application is as follows: the high-strength hydrogel material is injected along a vertical direction of water containing wooden historical relics in an injection mode; the materials are permitted to stand at 40-70 DEG C for 0.5-10 hours, in order to realize solution-gel phase transformation of the high-strength hydrogel material, and complete penetration and reinforcing of the high-strength hydrogel material; and finally dehydration treatment is carried out, and reinforcing, dehydration, and protection treatment are completed.

Description

technical field [0001] The invention relates to the technical field of preparation of a reinforcing agent for the protection of water-containing wooden cultural relics, in particular to a modified cellulose nanocrystal, a high-strength hydrogel material, a preparation method and an application. Background technique [0002] Wooden cultural relics carry political, economic, cultural and other information of a specific period, and its protection and preservation are of great significance to the inheritance of human history and culture. However, after long-term burial underground or long-term immersion in water environments such as rivers, lakes, and oceans, wooden cultural relics slowly degrade their wood cell walls, forming a porous cell wall residual structure containing water inside. If the water is not removed in time, bacteria, Substances such as acid and salt will aggravate the degradation of water-containing wooden cultural relics. [0003] However, the mechanical prop...

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Problems solved by technology

[0005] At present, widely used reinforcing agents, such as alum, polyethylene glycol, acrylate and other monomers and sugars, generally have disadvantages such as long processing period, irreversible removal, and safety needs to be improved, which greatly restricts the preservation of water-containing wooden cultural relics. effective protection

Studies have found that alum itself can degrade wood; the solubility, diffusibility and hygroscopicity of polyethylene glycol are inversely proportional to molecular weight, but the reinforcement ability is directly proportional to molecular weight, and it is difficult to shorten the mechanical strength of water-containing wooden cultural relics. The treatment is time-consuming, and in addition, the fragmentation products of polyethylene glycol will degrade wood; the penetration of monomers such as acrylate, phenolic or silane combined with thermal / light polymerization and cross-linking cannot be reversibly removed, and the polymerization conditions are not easy to grasp, prone to explosive polymerization, Adverse consequences such as uneven polymerization and low conversion rate; the use of reducing sugars such as sucrose, mannitol, trehalose, and sucralose and non-reducing sugars face: the former is easy to hydrolyze, and the hydrolyzate degrades wood; the latter is expensive and difficult Promotion and other issues

However, no reinforcement agent for the protection of water-containing wooden cultural relics that can fully satisfy the three principles of reversible removal, safety and effectiveness has not been seen at home and abroad.

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