Tannin-based high-performance adhesive and application

Abstract

The invention provides a preparation method and application of a tannin-based high-performance adhesive. According to the adhesive, the tannin with a linear structure or a body structure and the polyhydric alcohol are used for carrying out a controllable non-covalent weak effect, so that the adhesive has the characteristics of controllable rheological property, universal adhesion and flame-retardant adhesion, and can be used for realizing high-strength adhesion on various base materials.

Description

Technical Field

[0001] The present invention relates to the field of adhesives, and particularly to a tannin-based high-performance adhesive and its application. Background Art

[0002] High-performance adhesives with high bonding strength have important application values in modern industries (Zhang Y, Sun L, Li X, et al. Developing Eco-Friendly, High-Performance Soy Protein Plywood Adhesive via Core-Shell Hybridization and Borate Chemistry[J]. Materials, 2025, 18(5): 1144.). Biomass has the characteristics of wide source, renewable, and carbon-neutral, and is an ideal raw material for developing new high-performance adhesives. Tannin is a natural polyphenolic compound with a molecular weight of 500 - 3000, and has excellent self-assembly ability and reaction characteristics (de Melo L F M, de Queiroz Aquino-Martins V G, da Silva A P, et al. Biological and pharmacological aspects of tannins and potential biotechnological applications[J]. Food Chemistry, 2023, 414: 135645.), and has outstanding structural advantages in the development of new biomass-based high-performance adhesives. However, as a natural polyphenolic macromolecule, tannin has many reactive groups and high reactivity (Shi B, Di Y. Plant Polyphenols[M]. Science Press, 2000.), which leads to problems such as poor rheological properties, easy gelation and precipitation caused by strong intermolecular interactions of tannin when developing new biomass-based adhesives. The present invention effectively inhibits its gel behavior of biomass-based adhesives by regulating the weak interactions between tannin molecules, and prepares a general biomass-based adhesive with controllable rheological properties and flame-retardant bonding characteristics, which can be used for high-strength bonding of various substrates. Summary of the Invention

[0003] In view of the development requirements of new biomass-based high-performance adhesives with high bonding strength and special functions, the present invention provides a tannin-based high-performance adhesive and its application.

[0004] To achieve the above object, the technical solution provided by the present invention is as follows: A tannin-based high-performance adhesive, which is composed of tannin, polyol and solvent. Among them, the tannin is tannin with a linear structure or a three-dimensional structure.

[0005] Furthermore, the tannin includes any one of larch tannin, myrica rubra tannin, acacia mearnsii tannin, etc.

[0006] Furthermore, the solvent is a water-organic solvent mixture.

[0007] Furthermore, the tannin-based high-performance adhesive has controllable rheological properties, general adhesiveness, flame-retardant adhesiveness, and high-strength adhesiveness.

[0008] Compared with the prior art, the present invention has the following beneficial effects: 1. By utilizing the controllable regulation of the non-covalent weak interaction between tannin with a linear structure or a three-dimensional structure and polyol, the present invention can realize the regulation of the rheological properties of the tannin-based adhesive, avoid the precipitation and gel problems that are prone to occur in the tannin-based adhesive, and provide a good wetting basis for its high-performance adhesion.

[0009] 2. By utilizing the advantage that tannin is easy to generate a dense carbon layer during combustion to inhibit further combustion, the prepared tannin-based adhesive has flame-retardant bonding characteristics.

[0010] 3. The prepared tannin-based adhesive of the present invention has strong cohesive force and good interfacial compatibility with various substrates, thereby realizing universal high-strength bonding. Description of the Drawings

[0011] Figure 1 It is a physical diagram of the tannin-based high-performance adhesives - 9, tannin-based high-performance adhesives - 10, tannin-based high-performance adhesives - 11 and tannin-based high-performance adhesives - 12 prepared in Example 1; Figure 2 It is a physical diagram of the tannin-based high-performance adhesives - 21, tannin-based high-performance adhesives - 22, tannin-based high-performance adhesives - 23 and tannin-based high-performance adhesives - 24 prepared in Example 2; Figure 3 It is a physical diagram of the tannin-based high-performance adhesives - 33, tannin-based high-performance adhesives - 34, tannin-based high-performance adhesives - 35 and tannin-based high-performance adhesives - 36 prepared in Example 3; Figure 4 It is a viscosity data diagram of the tannin-based high-performance adhesive prepared in Example 1; Figure 5 It is a viscosity data diagram of the tannin-based high-performance adhesive prepared in Example 2; Figure 6 It is a viscosity data diagram of the tannin-based high-performance adhesive prepared in Example 3; Figure 7 It is a physical picture of the biomass-based high-strength material - 19 prepared in Example 2; Figure 8 It is the flexural strength diagram of the biomass-based high-strength material prepared in Example 1; Figure 9 It is the flexural strength diagram of the biomass-based high-strength material prepared in Example 2; Figure 10 It is the flexural strength diagram of the biomass-based high-strength material prepared in Example 3; Figure 11 It is the flame retardancy performance test diagram of the biomass-based high-strength materials - 7, biomass-based high-strength materials - 19, and biomass-based high-strength materials - 31 prepared in Examples 1 - 3; Figure 12 It is the formation mode of hydrogen bonds in different tannin-based high-performance adhesives simulated by molecular dynamics (the number of larch tannin model molecules is 100, the number of PVA model molecules is 100, the number of water molecules is 27800, and the number of ethanol molecules is 8600): LT-LT represents the hydrogen bonds formed between larch tannin molecules, PVA-PVA represents the hydrogen bonds formed between polyvinyl alcohol molecules, LT-PVA represents the hydrogen bonds formed between larch tannin molecules and polyvinyl alcohol molecules, BT-BT represents the hydrogen bonds formed between myrica rubra tannin molecules, BT-PVA represents the hydrogen bonds formed between myrica rubra tannin molecules and polyvinyl alcohol molecules, BWT-BWT represents the hydrogen bonds formed between black wattle tannin molecules, and BWT-PVA represents the hydrogen bonds formed between black wattle tannin and polyvinyl alcohol molecules; Figure 13 It is the precipitation diagram of the tannin-based adhesive prepared in the control example. Detailed implementation manners

[0012] The present invention will be specifically described below through examples, and the technical solutions of the present invention are not limited to the following specific implementation manners, but also include any combination between the specific implementation manners.

[0013] It is necessary to point out here that these examples are only used to further illustrate the present invention and cannot be understood as limiting the protection scope of the present invention. For some non-essential improvements and adjustments made by those skilled in the art according to the above-mentioned invention content, they are also regarded as falling within the protection scope of the present invention. The present invention provides a preparation method and application of a tannin-based high-performance adhesive, and the specific implementation scheme is as follows.

[0014] Example 1 Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 5.0 g of larch tannin (LT) and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-1. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 5.15 MPa, the bonding strength to iron sheets was 2.77 MPa, and the bonding strength to glass sheets was 0.66 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-1, whose flexural strength reaches 25.70 MPa.

[0015] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 12.5 g of larch tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-2. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 5.31 MPa, the bonding strength to iron sheets was 1.71 MPa, and the bonding strength to glass sheets was 0.97 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-2, whose flexural strength reaches 25.34 MPa.

[0016] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 25 g of larch tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-3. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 6.00 MPa, the bonding strength to iron sheets was 0.71 MPa, and the bonding strength to glass sheets was 0.65 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-3, whose flexural strength reaches 18.85 MPa.

[0017] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 50 g of larch tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-4. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 4.86 MPa, the bonding strength to iron sheets was 0.81 MPa, and the bonding strength to glass sheets was 0.38 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-4, whose flexural strength reaches 41.40 MPa.

[0018] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 5.0 g of larch tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-5. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 4.10 MPa, the bonding strength to iron sheets was 2.03 MPa, and the bonding strength to glass sheets was 1.64 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-5, whose flexural strength reaches 25.65 MPa.

[0019] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 12.5 g of larch tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-6. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 4.60 MPa, the bonding strength to iron sheets was 1.36 MPa, and the bonding strength to glass sheets was 1.79 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-6, whose flexural strength reaches 31.84 MPa.

[0020] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 25 g of larch tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-7. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 5.80 MPa, the bonding strength to iron sheets is 1.23 MPa, and the bonding strength to glass sheets is 0.85 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-7. After measurement, the flexural strength of this biomass-based high-strength material is 58.27 MPa, and the flame retardant grade reaches UL94 V-0.

[0021] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 50 g of larch tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-8. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 3.41 MPa, the bonding strength to iron sheets is 0.74 MPa, and the bonding strength to glass sheets is 0.91 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-8, and its flexural strength reaches 84.01 MPa.

[0022] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 5.0 g of larch tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain tannin-based high-performance adhesive-9. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 2.15 MPa, the bonding strength to iron sheets is 2.16 MPa, and the bonding strength to glass sheets is 1.87 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-9, and its flexural strength reaches 34.13 MPa.

[0023] Prepare a 200 mL water - ethanol (1:1, v / v) solution containing 12.5 g of larch tannin and 25 g of polyvinyl alcohol (PVA - 1088) to obtain tannin - based high - performance adhesive - 10. After bonding according to the bonding test method of GB / T 7124 - 2008, the bonding strength to wood chips is measured to be 2.53 MPa, the bonding strength to iron sheets is 1.47 MPa, and the bonding strength to glass sheets is 1.31 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass - based high - strength material - 10 can be prepared, and its flexural strength reaches 34.80 MPa.

[0024] Prepare a 200 mL water - ethanol (1:1, v / v) solution containing 25 g of larch tannin and 25 g of polyvinyl alcohol (PVA - 1088) to obtain tannin - based high - performance adhesive - 11. After bonding according to the bonding test method of GB / T 7124 - 2008, the bonding strength to wood chips is measured to be 2.91 MPa, the bonding strength to iron sheets is 1.26 MPa, and the bonding strength to glass sheets is 1.19 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass - based high - strength material - 11 can be prepared, and its flexural strength reaches 49.97 MPa.

[0025] Prepare a 200 mL water - ethanol (1:1, v / v) solution containing 50 g of larch tannin and 25 g of polyvinyl alcohol (PVA - 1088) to obtain tannin - based high - performance adhesive - 12. After bonding according to the bonding test method of GB / T 7124 - 2008, the bonding strength to wood chips is measured to be 2.51 MPa, the bonding strength to iron sheets is 0.49 MPa, and the bonding strength to glass sheets is 0.89 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass - based high - strength material - 12 can be prepared, and its flexural strength reaches 84.69 MPa.

[0026] The physical pictures of tannin - based high - performance adhesive - 9, tannin - based high - performance adhesive - 10, tannin - based high - performance adhesive - 11, and tannin - based high - performance adhesive - 12 prepared in this example are as Figure 1 shown. The viscosities of all tannin - based high - performance adhesives prepared in this example are as Figure 4 shown. The flexural strengths of all biomass - based high - strength materials prepared in this example are as Figure 8 shown. The flame - retardant properties of biomass - based high - strength material - 7 prepared in this example are as Figure 11 shown.

[0027] Example 2 Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 5.0 g of bayberry tannin (BT) and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-13. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 6.23 MPa, the bonding strength to iron sheets was 2.62 MPa, and the bonding strength to glass sheets was 1.82 MPa. When this adhesive was used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-13 could be prepared, and its modulus of rupture reached 40.97 MPa.

[0028] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 12.5 g of bayberry tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-14. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 6.79 MPa, the bonding strength to iron sheets was 1.94 MPa, and the bonding strength to glass sheets was 1.42 MPa. When this adhesive was used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-14 could be prepared, and its modulus of rupture reached 35.74 MPa.

[0029] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 25 g of bayberry tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-15. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 6.80 MPa, the bonding strength to iron sheets was 0.78 MPa, and the bonding strength to glass sheets was 1.31 MPa. When this adhesive was used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-15 could be prepared, and its modulus of rupture reached 41.28 MPa.

[0030] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 50 g of myrica tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-16. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 5.78 MPa, the bonding strength to iron sheets was 0.63 MPa, and the bonding strength to glass sheets was 0.89 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, a biomass-based high-strength material-16 can be prepared, and its flexural strength reaches 39.49 MPa.

[0031] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 5.0 g of myrica tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-17. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 5.09 MPa, the bonding strength to iron sheets was 3.41 MPa, and the bonding strength to glass sheets was 1.16 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, a biomass-based high-strength material-17 can be prepared, and its flexural strength reaches 60.77 MPa.

[0032] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 12.5 g of myrica tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-18. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 5.20 MPa, the bonding strength to iron sheets was 2.47 MPa, and the bonding strength to glass sheets was 0.71 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, a biomass-based high-strength material-18 can be prepared, and its flexural strength reaches 89.57 MPa.

[0033] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 25 g of myricetin tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-19. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 6.71 MPa, the bonding strength to iron sheets was 1.09 MPa, and the bonding strength to glass sheets was 0.49 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-19. After measurement, the flexural strength of this biomass-based high-strength material is 106.33 MPa, and the flame retardant grade reaches UL94 V-0.

[0034] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 50 g of myricetin tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-20. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 5.18 MPa, the bonding strength to iron sheets was 0.64 MPa, and the bonding strength to glass sheets was 0.59 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-20, and its flexural strength reaches 115.82 MPa.

[0035] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 5.0 g of myricetin tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain tannin-based high-performance adhesive-21. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 2.30 MPa, the bonding strength to iron sheets was 1.93 MPa, and the bonding strength to glass sheets was 1.32 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, mixing, pressing, demolding, and drying can prepare biomass-based high-strength material-21, and its flexural strength reaches 57.11 MPa.

[0036] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 12.5 g of myrica tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain the tannin-based high-performance adhesive-22. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 2.66 MPa, the bonding strength to iron sheets is 0.96 MPa, and the bonding strength to glass sheets is 1.02 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, the biomass-based high-strength material-22 can be prepared, and its flexural strength reaches 74.11 MPa.

[0037] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 25 g of myrica tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain the tannin-based high-performance adhesive-23. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 2.80 MPa, the bonding strength to iron sheets is 1.19 MPa, and the bonding strength to glass sheets is 1.04 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, the biomass-based high-strength material-23 can be prepared, and its flexural strength reaches 88.85 MPa.

[0038] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 50 g of myrica tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain the tannin-based high-performance adhesive-24. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 2.32 MPa, the bonding strength to iron sheets is 0.66 MPa, and the bonding strength to glass sheets is 0.41 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, the biomass-based high-strength material-24 can be prepared, and its flexural strength reaches 106.07 MPa.

[0039] The physical pictures of the tannin-based high-performance adhesives-21, tannin-based high-performance adhesives-22, tannin-based high-performance adhesives-23, and tannin-based high-performance adhesives-24 prepared in this example are as Figure 2 shown. The viscosities of all the tannin-based high-performance adhesives prepared in this example are as Figure 5 shown. The physical picture of the biomass-based high-strength material-19 prepared in this example is as Figure 7 shown. The flexural strengths of all the biomass-based high-strength materials prepared in this example are as Figure 9As shown. The flame retardancy of the biomass-based high-strength material-19 prepared in this example is as Figure 11 shown.

[0040] Example 3 Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 5.0 g of black wattle tannin (BWT) and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-25. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 6.28 MPa, the bonding strength to iron sheets is 3.08 MPa, and the bonding strength to glass sheets is 1.36 MPa. Use this adhesive for wood fiber bonding, control the mass ratio of the adhesive to wood fiber to be 2:1, mix, press, demold, and dry to prepare biomass-based high-strength material-25, and its flexural strength reaches 33.75 MPa.

[0041] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 12.5 g of black wattle tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-26. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 6.50 MPa, the bonding strength to iron sheets is 2.82 MPa, and the bonding strength to glass sheets is 1.45 MPa. Use this adhesive for wood fiber bonding, control the mass ratio of the adhesive to wood fiber to be 2:1, mix, press, demold, and dry to prepare biomass-based high-strength material-26, and its flexural strength reaches 35.13 MPa.

[0042] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 25 g of black wattle tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-27. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 6.54 MPa, the bonding strength to iron sheets is 1.97 MPa, and the bonding strength to glass sheets is 1.46 MPa. Use this adhesive for wood fiber bonding, control the mass ratio of the adhesive to wood fiber to be 2:1, mix, press, demold, and dry to prepare biomass-based high-strength material-27, and its flexural strength reaches 36.31 MPa.

[0043] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 50 g of black wattle tannin and 25 g of polyvinyl alcohol (PVA-1799) to obtain tannin-based high-performance adhesive-28. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 5.26 MPa, the bonding strength to iron sheets is 1.33 MPa, and the bonding strength to glass sheets is 1.29 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-28 can be prepared, and its flexural strength reaches 40.97 MPa.

[0044] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 5.0 g of black wattle tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-29. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 4.83 MPa, the bonding strength to iron sheets is 3.71 MPa, and the bonding strength to glass sheets is 1.65 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-29 can be prepared, and its flexural strength reaches 49.87 MPa.

[0045] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 12.5 g of black wattle tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-30. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 5.00 MPa, the bonding strength to iron sheets is 2.21 MPa, and the bonding strength to glass sheets is 1.52 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-30 can be prepared, and its flexural strength reaches 92.29 MPa.

[0046] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 25 g of black wattle tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-31. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 5.18 MPa, the bonding strength to iron sheets was 1.72 MPa, and the bonding strength to glass sheets was 1.21 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-31 can be prepared. The flexural strength of the biomass-based high-strength material was measured to be 93.96 MPa, and the flame retardant rating reached UL94 V-0.

[0047] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 50 g of black wattle tannin and 25 g of polyvinyl alcohol (PVA-1788) to obtain tannin-based high-performance adhesive-32. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 5.16 MPa, the bonding strength to iron sheets was 1.19 MPa, and the bonding strength to glass sheets was 0.75 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-32 can be prepared, and its flexural strength reached 102.52 MPa.

[0048] Prepare a 200 mL water-ethanol (1:1, v / v) solution containing 5.0 g of black wattle tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain tannin-based high-performance adhesive-33. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips was measured to be 2.00 MPa, the bonding strength to iron sheets was 2.41 MPa, and the bonding strength to glass sheets was 1.52 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, biomass-based high-strength material-33 can be prepared, and its flexural strength reached 51.62 MPa.

[0049] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 12.5 g of mimosa tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain tannin-based high-performance adhesive-34. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 2.29 MPa, the bonding strength to iron sheets is 2.00 MPa, and the bonding strength to glass sheets is 1.23 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, a biomass-based high-strength material-34 can be prepared, and its flexural strength reaches 62.98 MPa.

[0050] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 25 g of mimosa tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain tannin-based high-performance adhesive-35. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 2.32 MPa, the bonding strength to iron sheets is 1.35 MPa, and the bonding strength to glass sheets is 1.01 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, a biomass-based high-strength material-35 can be prepared, and its flexural strength reaches 75.87 MPa.

[0051] Prepare a 200 mL water-ethanol (1:1, volume ratio) solution containing 50 g of mimosa tannin and 25 g of polyvinyl alcohol (PVA-1088) to obtain tannin-based high-performance adhesive-36. After bonding according to the bonding test method of GB / T 7124-2008, the bonding strength to wood chips is measured to be 3.98 MPa, the bonding strength to iron sheets is 0.99 MPa, and the bonding strength to glass sheets is 0.83 MPa. When this adhesive is used for bonding wood fibers, controlling the mass ratio of the adhesive to wood fibers to be 2:1, and after mixing, pressing, demolding, and drying, a biomass-based high-strength material-36 can be prepared, and its flexural strength reaches 87.23 MPa.

[0052] The physical pictures of the tannin-based high-performance adhesives-33, tannin-based high-performance adhesives-34, tannin-based high-performance adhesives-35, and tannin-based high-performance adhesives-36 prepared in this example are as Figure 3 shown. The viscosities of all the tannin-based high-performance adhesives prepared in this example are as Figure 6 shown. The flexural strengths of all the biomass-based high-strength materials prepared in this example are as Figure 10 shown. The flame retardant properties of the biomass-based high-strength material-31 prepared in this example are as Figure 11 shown.

[0053] Control Example A tannin-based adhesive-1 was prepared by dissolving 25 g of myrica tannin and 25 g of polyvinyl alcohol (PVA-1799) in 200 mL of aqueous solution. There was a phenomenon of precipitation in this adhesive.

[0054] A tannin-based adhesive-2 was prepared by dissolving 25 g of myrica tannin and 25 g of polyvinyl alcohol (PVA-1788) in 200 mL of aqueous solution. There was a phenomenon of precipitation in this adhesive.

[0055] A tannin-based adhesive-3 was prepared by dissolving 25 g of acacia tannin and 25 g of polyvinyl alcohol (PVA-1088) in 200 mL of aqueous solution. There was a phenomenon of precipitation in this adhesive.

[0056] The physical diagram of the tannin-based adhesive prepared in this control example is as Figure 13 shown.

Claims

1. A tannin-based high-performance adhesive, characterized in that, The high-performance adhesive is composed of tannin, polyol and solvent. Among them, the tannin is tannin with a linear structure or a three-dimensional structure.

2. The tannin-based high-performance adhesive according to claim 1, wherein The tannin includes any one of larch tannin, myrica rubra tannin and acacia mearnsii tannin.

3. The tannin-based high-performance adhesive according to claim 1, characterized in that, The solvent is a water-organic solvent mixture.

4. The tannin-based high-performance adhesive according to claim 1, wherein The tannin-based high-performance adhesive has controllable rheological properties, general adhesiveness, flame-retardant adhesiveness and high-strength adhesiveness.

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