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CN-122012018-A - Walnut green seedcase carbon nano rod modified soybean protein adhesive and preparation method thereof

CN122012018ACN 122012018 ACN122012018 ACN 122012018ACN-122012018-A

Abstract

The invention discloses a walnut green seedcase carbon nano-rod modified soybean protein adhesive and a preparation method thereof, belonging to the technical field of bio-based wood adhesives, wherein the invention prepares a carbon nano-rod by taking walnut green seedcase as a carbon source, and uses the carbon nano-rod as a functional nano-filler to be mixed with soybean protein at room temperature, under the conditions of no pretreatment and no chemical cross-linking agent, a non-covalent network structure is constructed through hydrogen bonding action, electrostatic adsorption action, hydrophobic interface action and nano-domain limiting effect between the carbon nano-rod and the soybean protein, so that the water resistance and the bonding strength of the adhesive are obviously improved. The preparation process is simple, the energy consumption is low, and the obtained adhesive is formaldehyde-free, environment-friendly and suitable for bonding of plywood.

Inventors

  • WAN JIANYONG
  • YANG ZHENGYONG
  • ZHOU XIAOJIAN
  • TAO LI
  • MU GEGE
  • SUN XUN
  • KUANG FENG

Assignees

  • 西南林业大学

Dates

Publication Date
20260512
Application Date
20260212

Claims (10)

  1. 1. The preparation method of the walnut green seedcase carbon nano-rod modified soybean protein adhesive is characterized by comprising the following steps of: (1) Preparing a carbon nano rod solution by taking walnut green seedcases as a carbon source and water as a solvent through hydrothermal treatment; (2) And fully dispersing the carbon nano rod solution and water at room temperature, then adding soybean protein powder, and uniformly stirring to obtain the walnut green seedcase carbon nano rod modified soybean protein adhesive.
  2. 2. The preparation method of the walnut green seedcase carbon nanorod modified soybean protein adhesive, which is disclosed in claim 1, is characterized in that in the step (1), the mass concentration of the walnut green seedcase in water is 1-4wt%.
  3. 3. The method for preparing the walnut green seedcase carbon nanorod modified soybean protein adhesive according to claim 1, wherein in the step (1), the temperature of the hydrothermal treatment is 160 ℃ and the time is 6-10 h.
  4. 4. The method for preparing the walnut green seedcase carbon nanorod modified soybean protein adhesive according to claim 3, wherein the hydrothermal treatment time is 8 h.
  5. 5. The method according to claim 1, wherein the carbon nanorods in the carbon nanorod solution have a one-dimensional rod-like nanostructure, and have a length of 50-2000 nm and a diameter of 5-200 nm.
  6. 6. The preparation method of the walnut green seedcase carbon nano-rod modified soybean protein adhesive according to claim 1, wherein in the step (2), the mass ratio of the carbon nano-rod solution to the water to the soybean protein powder is (1-6) to (9.5-14.5) to 3, and the three are uniformly mixed and stirred at room temperature for 10min to obtain the adhesive.
  7. 7. A walnut green seedcase carbon nano-rod modified soybean protein adhesive, which is characterized by being prepared by the preparation method of any one of claims 1-6.
  8. 8. The walnut green carbon nano-rod modified soy protein adhesive of claim 7 wherein the carbon nano-rods form a cross-linked network structure with soy protein molecules through non-covalent interactions.
  9. 9. A waterproof plywood is characterized by comprising the following preparation steps: the walnut green seedcase carbon nanorod modified soybean protein adhesive is prepared by coating the walnut green seedcase carbon nanorod modified soybean protein adhesive on the surface of a veneer, overlapping the veneer according to the principle of interlayer texture intersection, and performing hot press curing.
  10. 10. The water resistant plywood according to claim 9, wherein the heat press curing conditions are heat press curing under heat press conditions of 120 ℃ and 1.2 MPa of 6 min.

Description

Walnut green seedcase carbon nano rod modified soybean protein adhesive and preparation method thereof Technical Field The invention belongs to the technical field of bio-based wood adhesives, and particularly relates to a walnut green husk carbon nano-rod modified soybean protein adhesive and a preparation method thereof. Background As a typical bio-based wood adhesive material, the soybean protein adhesive has the advantages of wide raw material sources, reproducibility, no formaldehyde release, environmental friendliness and the like, and has good application prospect in the manufacturing field of artificial boards such as plywood, fiber boards and the like. However, the soybean protein has high content of hydrophilic groups and insufficient hydrophobicity, the molecular chains are mainly dependent on weak interaction such as hydrogen bonds, the internal structure is relatively loose, swelling, structural damage or interfacial dissociation are easy to occur under the action of moisture, the adhesive layer has poor water resistance and low wet bonding strength, and therefore the application of the soybean protein in high-performance and water-resistant artificial board products is limited. In order to improve the mechanical property and the water resistance of the soy protein adhesive, methods such as chemical crosslinking, enzymolysis modification, alkali treatment, inorganic or organic nano filler reinforcement and the like are generally adopted in the prior art. The chemical modification system is mainly dependent on cross-linking agents such as aldehydes and isocyanate to form a covalent cross-linking network, so that the adhesive strength can be remarkably improved, but the application of the chemical modification system in the field of green artificial boards is limited by potential environmental and health risks, and the enzymolysis modification and alkali treatment generally need more severe reaction conditions, have complex process and higher cost, and are unfavorable for industrial continuous production. In recent years, carbon-based nanomaterials have been attracting attention because of their wide sources, relatively simple preparation methods, low cost, and the surface being rich in active functional groups such as hydroxyl groups, carboxyl groups, and amino groups. The application of carbon nano dots in soybean protein adhesives is reported, but the carbon nano dots mainly exist in a zero-dimensional dot structure, a continuous reinforcing network is difficult to construct in an adhesive layer, and the reinforcing effect is limited. In contrast, carbon nanorods have a one-dimensional rod-like structure and a higher length-diameter ratio, have a larger interface contact area in a polymer matrix, and are easier to form physical support and stress transfer channels, thus having more outstanding enhancement potential. However, through searching the existing literature, no public report of introducing the carbon nano-rods into a soy protein adhesive system and researching the reinforcing effect and the action mechanism of the carbon nano-rods is seen. The structural action mode of the carbon nano-rod in the soybean protein adhesive, the interaction mode between the carbon nano-rod and soybean protein molecules and the influence of the carbon nano-rod on the microstructure and the water resistance of the adhesive layer are still not clear, and the related technical field is still obviously blank. Therefore, there is a need to develop a preparation method of a carbon nano rod modified soy protein adhesive with controllable structure and definite action mechanism, and under the premise of avoiding using a toxic cross-linking agent, a stable and compact adhesive layer structure is constructed by reasonably designing the structural characteristics of the carbon nano rod and the interaction mode of the carbon nano rod and soy protein molecules, so that the cooperative improvement of the mechanical property and the water resistance of the adhesive is realized. Disclosure of Invention Aiming at the technical problems of poor water resistance, low wet bonding strength, insufficient mechanical property and the like of the existing soybean protein adhesive, the invention provides a walnut green husk carbon nano-rod modified soybean protein adhesive and a preparation method thereof, so as to realize the preparation of the environment-friendly, environment-friendly and high-performance adhesive. In order to achieve the above purpose, the present invention provides the following technical solutions: The preparation method of the walnut green seedcase carbon nano-rod modified soybean protein adhesive comprises the following steps: (1) Preparing a carbon nano rod solution by taking walnut green seedcases as a carbon source and water as a solvent through hydrothermal treatment; (2) And fully dispersing the carbon nano rod solution and water at room temperature, then adding soybean protein powder, and uniformly st