CN-122008368-A - Glue-free gluing reinforced bamboo laminated material, preparation method and application

Abstract

The invention discloses a glue-free gluing reinforced bamboo laminated material, a preparation method and application thereof, and belongs to the technical field of bamboo material bonding. The glue-free gluing reinforced bamboo laminated material comprises a plurality of layers of modified bamboo materials glued by hot pressing, wherein regenerated lignin containing amino and carboxyl functional groups is deposited on the surface and/or inside of the modified bamboo materials, the regenerated lignin is formed by water-induced regeneration deposition after enzymolysis lignin is dissolved and modified by a eutectic solvent, and the eutectic solvent comprises formic acid, L-lysine and 1, 4-butanediol.

Inventors

• LIU XIAORONG
• WANG RUI
• XU XINWU
• WANG KAILI
• DONG YOUMING

Assignees

• 南京林业大学

Dates

Publication Date

20260512

Application Date

20260208

Claims (10)

1. 1. The bamboo laminated material is characterized by comprising a plurality of layers of modified bamboo materials which are glued by hot pressing, wherein regenerated lignin containing amino and carboxyl functional groups is deposited on the surface and/or inside of the modified bamboo materials, the regenerated lignin is formed by dissolving and modifying enzymatic lignin by a eutectic solvent and then performing water-induced regeneration deposition, and the eutectic solvent comprises formic acid, L-lysine and 1, 4-butanediol.
2. 2. The glue-free reinforced bamboo laminated material according to claim 1, wherein the molar ratio of formic acid, L-lysine and 1, 4-butanediol in the eutectic solvent is 5:1:4.
3. 3. The glue-free glue-reinforced bamboo laminated wood material according to claim 1, wherein the mass ratio of the enzymatic lignin to the eutectic solvent is (4-16) 100, and the enzymatic lignin is corncob-derived enzymatic lignin.
4. 4. The glue-free reinforced bamboo laminated material according to claim 1, wherein the bamboo laminated material has a dry shear strength of 2.76 MPa or more and a wet shear strength of 1.46 MPa or more.
5. 5. A method for producing the glue-free glue-reinforced bamboo laminated material as claimed in any one of claims 1 to 4, comprising the steps of: (1) Mixing and heating formic acid, L-lysine and 1, 4-butanediol to obtain a solution A, and adding enzymatic hydrolysis lignin into the solution A to dissolve to obtain a solution B; (2) Soaking bamboo blocks in the solution B for heating treatment, adding deionized water into the system after soaking, stirring, inducing lignin to regenerate and deposit, taking out bamboo blocks, cleaning and drying to obtain modified bamboo; (3) And (3) placing the modified bamboo timber assembly into a hot press for hot pressing to obtain the glue-free gluing reinforced bamboo laminated material.
6. 6. The method according to claim 5, wherein in the step (1), the molar ratio of formic acid, L-lysine and 1, 4-butanediol is 5:1:4, and the temperature of the mixed heating is 60 ℃ and the time is 60 min.
7. 7. The preparation method according to claim 5, wherein in the step (1), the mass ratio of the solution A to the enzymatic hydrolysis lignin is 100 (4-16), the dissolution temperature is 120 ℃ and the time is 40-180 min.
8. 8. The method according to claim 5, wherein in the step (2), the treatment temperature of the dipping is 110 ℃, the treatment time is 20 min, the volume ratio of the deionized water to the solution B is (10-12): 1, and the stirring time is 2 h.
9. 9. The method according to claim 5, wherein in the step (3), the hot pressing is performed at 160 ℃ and at 2 MPa for 15: 15min, and deionized water is sprayed onto the surface of the modified bamboo material before the assembly.
10. 10. Use of the glue-free glue-reinforced bamboo laminate material according to any one of claims 1-4 as a raw material in the field of furniture manufacture, upholstery, vehicle interior or packaging material.

Description

Glue-free gluing reinforced bamboo laminated material, preparation method and application Technical Field The invention relates to the technical field of bamboo material bonding, in particular to a glue-free bonding reinforced bamboo laminated material, a preparation method and application. Background Bamboo wood is used as a biomass resource with wide distribution, rapid growth and strong regeneration, and has excellent mechanical property and remarkable carbon sealing and storing capacity. Under the 'double carbon' strategic background, the bamboo product is used as a green substitute for traditional wood and high-energy building materials, and has great application potential in the field of structural engineering. However, natural bamboo has the defects of thin and hollow wall, large tapering degree, uneven bamboo joint distribution and the like, and the original bamboo has a narrow breadth, so that the direct industrial application of the bamboo is severely limited. In order to overcome the defects, bamboo is usually processed into units, and then recombined through an adhesive to prepare the bamboo integrated material, recombined bamboo and other engineering structural materials. At present, phenolic resins are widely used for the production of bamboo structural materials because of their high adhesive strength and good water resistance. However, the traditional synthetic resin adhesive has serious disadvantages that on one hand, raw materials are derived from non-renewable petrochemical resources, the energy consumption in the production process is high, the carbon emission is large, and on the other hand, harmful volatile matters such as formaldehyde and the like can be continuously released in the use process, so that the human health is seriously endangered and the environment is polluted. Therefore, development of a green bonding technology which does not depend on fossil resources and has no formaldehyde release, and realization of glue-free bonding or self bonding of bamboo materials, has become a key technical problem to be solved urgently in the field of biomass materials. In recent years, researchers find that the core adhesion component of marine mussels is 3, 4-Dihydroxyphenylalanine (DOPA) in the presence of strong adhesion to substrates such as rock, metal and the like in a humid environment. The catechol group in DOPA molecule can oxidize to form quinoid structure, form coordination bond, hydrogen bond and pi-pi accumulation with the substrate, and the amino group and carboxyl group in the structure can obviously enhance the interface adhesion performance through synergistic effect. Lignin is used as a main chemical component of bamboo wood, has a benzene ring skeleton and a polyphenol structure similar to DOPA, and has the natural potential of being converted into a biological adhesive. However, natural lignin is less active and difficult to directly utilize. The eutectic solvent (DES) is an emerging green solvent that can effectively solubilize and modify lignin. Although the existing carboxylic acid DES can effectively crack lignin, the condensation reaction of lignin is easy to induce under the high-temperature environment, and the condensation structure can reduce the reactivity of lignin, so that the subsequent utilization of lignin as an adhesive is not facilitated. Studies have shown that proper incorporation of polyols in solvent systems can act as "condensation retarders" effectively preventing ineffective condensation of lignin fragments. Disclosure of Invention Aiming at the defects of the prior art, the invention provides a method for constructing a tricarboxylic acid-amino acid-alcohol eutectic solvent system by using formic acid, L-lysine and 1, 4-butanediol to treat bamboo. The method aims at utilizing 1, 4-butanediol to inhibit lignin condensation, and simultaneously utilizing L-lysine to introduce amino and carboxyl into lignin molecules, so as to modify the lignin into regenerated lignin which is imitative of DOPA structure and is rich in active groups. The water is used as an antisolvent to induce the modified lignin to deposit on the surface of the bamboo, so that the roughness of the surface of the bamboo can be increased, and the high-strength and water-resistant glue-free gluing of the bamboo can be realized in the hot pressing process by utilizing the hydrogen bond, covalent bond and physical entanglement effect generated by the modified lignin, thereby thoroughly solving the problems of dependence of the traditional bamboo laminated wood on petrochemical adhesives and formaldehyde release. The invention relates to a glue-free gluing reinforced bamboo laminated material, which comprises a plurality of layers of modified bamboo materials glued by hot pressing, wherein regenerated lignin containing amino and carboxyl functional groups is deposited on the surface and/or inside of the modified bamboo materials, the regenerated lignin is formed by water-induced regene