Graphite glutinous rice bionic glue as well as preparation method and application thereof

Abstract

The invention relates to the field of bionic glue, and particularly discloses graphite glutinous rice bionic glue as well as a preparation method and application thereof. The graphite glutinous rice bionic glue is prepared from the following raw materials in percentage by weight: 64.5-65% of a glutinous rice extract, 10-20% of plant fibers, 15-25% of a mineral compound and 0.1-0.5% of a graphite substance, the mineral compound is composed of nanoscale silicate and calcium-based minerals according to the weight ratio of (2-4): 1, and the plant fibers are bamboo fibers and / or linen fibers. The preparation method comprises the following steps: S1, ultrasonically blending and dispersing the mineral compound and the graphite substance to obtain a mixture; s2, adding the plant fibers and the mixture into the glutinous rice extract, and uniformly stirring. The prepared graphite glutinous rice bionic glue is used for building boards, has good temperature resistance, moisture resistance and environmental protection property, is good in bonding stability, is used in a complex humid and hot environment for a long time, does not easily cause interlayer expansion cracking and separation of the building boards, and is suitable for high-end home decoration.

Description

Technical Field

[0001] The present application relates to the field of bionic adhesives, and more specifically, it relates to a graphite glutinous rice bionic adhesive and a preparation method thereof. Background Art

[0002] In the field of building boards, such as the production of plywood, particleboard, fiberboard, etc., adhesives play a crucial role. As the construction industry has higher and higher requirements for the functionality and environmental protection of building boards, adhesives not only affect the bonding strength and durability of the boards, but also are related to the environmental protection performance and production cost of the boards.

[0003] Currently, the commonly used adhesives in building boards are generally synthetic resin adhesives and bionic adhesives. Synthetic resin adhesives such as urea-formaldehyde resin glue, phenolic resin glue, polyurethane glue, epoxy resin glue, etc. Although these adhesives have good bonding strength, when used in a long-term complex humid and hot environment, harmful substances such as formaldehyde will be released during use, which will cause harm to the environment and human health. Bionic adhesives include cellulose glue, lignin glue, starch glue, soybean protein glue, etc. By bionic modification to improve their bonding performance, the adhesives have the advantages of being green, environmentally friendly, and degradable. However, when these bionic adhesives are used in a long-term complex humid and hot environment, the resulting building boards are prone to problems such as interlayer swelling, cracking, and separation. Especially when applied to high-end home decoration, their performance cannot meet the use requirements of consumers. Therefore, further research is needed on the adhesives currently used in building boards. Summary of the Invention

[0004] In order to solve the problem that the existing adhesives for building boards cannot better combine heat resistance, moisture resistance, and environmental protection when used in a long-term complex humid and hot environment, the present application provides a graphite glutinous rice bionic adhesive, a preparation method thereof, and an application.

[0005] In the first aspect, the present application provides a graphite glutinous rice bionic adhesive, adopting the following technical solution: A graphite glutinous rice bionic adhesive is prepared from the following raw materials by weight percentage: Glutinous rice extract 64.5 - 65% Plant fiber 10 - 20% Mineral complex 15 - 25% Graphite substance 0.1 - 0.5%; The mineral complex is composed of nano-silicate and calcium-based mineral with a weight ratio of (2 - 4):1; the nano-silicate is nano-lithium magnesium silicate and / or nano-magnesium aluminum silicate, the calcium-based mineral is wollastonite and / or calcite, and the plant fiber is bamboo fiber and / or linen fiber.

[0006] By adopting the above technical solution, the bionic glue of the present application uses rice extract as a dispersion system. The rice extract contains a large amount of amylopectin, endowing the bionic glue with excellent adhesive properties and environmental friendliness. However, the heat-resistant and moisture-resistant adhesive properties of the rice extract are insufficient. Therefore, plant fibers, mineral complexes, and graphite complexes are added to the rice extract. By controlling the dosage ratios of the three, a good synergistic effect can be produced, and they are evenly dispersed in the rice extract to form a uniform and stable adhesive system, endowing the bionic glue with excellent temperature and moisture resistance and adhesive stability. Among them, bamboo fiber and / or flax fiber are selected as the plant fibers. While having good bionic properties and low cost, they can also endow the bionic glue with excellent mechanical strength, thereby improving the adhesiveness of the bionic glue. Mineral complexes are composed of nano-silicates and calcium-based minerals with a relatively optimal weight ratio. Nano-lithium magnesium silicate and / or nano-magnesium aluminum silicate are selected as nano-scale silicates, and wollastonite and / or calcite are selected as calcium-based substances, which can further disperse and combine with the rice extract. Under the synergistic effect of plant fibers and graphite substances, the moisture absorption performance of the bionic glue system can be reduced, and the temperature and moisture resistance and adhesive properties of the bionic glue can be improved.

[0007] In summary, when the graphite rice bionic glue prepared in the present application is applied to building boards and used in a long-term complex humid and hot environment, it can effectively reduce the problems of interlayer swelling, cracking, and separation of building boards. At the same time, it also has good flame retardancy and environmental friendliness, without formaldehyde and TVOC release, and is suitable for high-end home decoration.

[0008] Preferably, the particle size of the nano-scale silicate is 20 - 50 nm; the particle size of the calcium-based substance is 0.5 - 2 μm.

[0009] By adopting the above technical solution, nano-scale silicates and calcium-based substances with relatively optimal particle sizes are compounded as mineral complexes. The small-particle-size nano-scale silicates can be intertwined and dispersed in the gaps of the large-particle-size calcium-based substances, reducing the dispersion distance of the mineral complexes in the rice extract, enhancing the "skeleton" stability of the bionic glue, and thus enhancing the cohesion of the bionic glue to improve the moisture and heat resistance and adhesiveness of the bionic glue. At the same time, it can also improve the flame retardant performance of the bionic glue.

[0010] Preferably, the plant fiber is a modified plant fiber, and the modified plant fiber is prepared by the following steps: adding chitosan quaternary ammonium salt and 1-butyl-3-methylimidazolium acetate to an aqueous solution of 5 - 15 wt% alkaline hydroxide, stirring evenly, adding plant fiber, heating to 60 - 80 °C, stirring and soaking for 20 - 40 min, washing with water and drying to obtain the modified plant fiber.

[0011] By adopting the above technical solution, although plant fibers have good adsorption performance, it is found in the use process that the dispersibility of plant fibers with other components in the bionic glue is relatively low, which makes the bionic glue prone to moisture absorption problems in a humid and hot environment, reducing the temperature resistance and moisture resistance adhesiveness of the bionic glue. Therefore, in this application, chitosan quaternary ammonium salt and 1-butyl-3-methylimidazolium acetate are added to an aqueous solution of alkaline hydroxide, and the plant fibers are treated under optimal temperature and time conditions, which can fluff the plant fibers, making the molecular chain segments of the plant fibers softer and looser. At the same time, chitosan quaternary ammonium salt and 1-butyl-3-methylimidazolium acetate can produce a good synergistic effect, forming a uniform adsorption film on the surface of the loose molecular chain segments, which can improve the adsorption uniformity and stability of mineral complexes and graphite substances, significantly enhance the compatibility and binding force between plant fibers, glutinous rice extract and mineral complexes, and then reduce the problem that plant fibers are prone to moisture absorption. As the "supporting skeleton" of the bionic glue, it further improves the cohesive force of the bionic glue, enhances the durability and adhesive stability of the bionic glue in a complex humid and hot environment, and reduces the problems of interlayer swelling, cracking and separation that may occur during the use of building boards.

[0012] Preferably, the modified plant fiber is prepared from the following raw materials in parts by weight: Plant fiber 4 - 6 parts 5 - 15wt% aqueous solution of alkaline hydroxide 8 - 10 parts Chitosan quaternary ammonium salt 0.2 - 0.4 parts 1-butyl-3-methylimidazolium acetate 0.3 - 0.5 parts; The aqueous solution of alkaline hydroxide is any one of sodium hydroxide aqueous solution and potassium hydroxide aqueous solution.

[0013] By adopting the above technical solution, optimizing the dosage of each component in the modified plant fiber can improve the modification efficiency of plant fibers while reducing the corrosion of plant fibers caused by excessive aqueous solution of hydroxide, thereby affecting the mechanical strength problem.

[0014] Preferably, the specification of the plant fiber is 1.1 - 1.5 dtex and the length is 5 - 10 μm.

[0015] By adopting the above technical solution, plant fibers with better specifications have good support and dispersibility, which can further improve the overall adhesive strength and durability of the bionic glue.

[0016] Preferably, the glutinous rice extract is prepared by the following steps: Mix glutinous rice flour and water in a weight ratio of 1:(10 - 12), add amylase accounting for 0.1 - 0.3 wt% of the weight of glutinous rice flour for enzymatic hydrolysis. The enzymatic hydrolysis temperature is 40 - 50 °C, and the enzymatic hydrolysis time is 1 - 2 h. Then add polyaspartic acid accounting for 1 - 2 wt% of the weight of glutinous rice flour, mix evenly to obtain glutinous rice extract.

[0017] By adopting the above technical solution, since a large amount of amylopectin is contained in glutinous rice, although it has good adhesion performance, it will affect the fluidity and cohesion of the glue when used in the bionic glue. Therefore, this application uses amylase and polyaspartic acid to prepare glutinous rice extract. By enzymatically hydrolyzing glutinous rice flour with amylase under optimal temperature and time conditions, the ratio of amylose and amylopectin in the glutinous rice extract is optimized, and further gelatinization is carried out with polyaspartic acid to improve the fluidity and cohesion of the bionic glue. At the same time, polyaspartic acid can further improve the binding performance of the glutinous rice extract with plant fibers, mineral complexes and graphite substances. Through the process of enzymatic hydrolysis and cooperation with polyaspartic acid, the glutinous rice extract prepared in this way is applied to the bionic glue, so that it can maintain good stability and adhesion strength performance in a complex humid and hot environment.

[0018] Preferably, the amylase is composed of α - amylase and isoamylase in a weight ratio of 1:(0.1 - 0.25).

[0019] By adopting the above technical solution, using α - amylase and isoamylase with an optimal weight ratio as amylase can better optimize the ratio of amylose and amylopectin in the glutinous rice extract, synergistically improve the adhesion stability of the glutinous rice extract, and further enhance the moisture - heat resistant adhesion stability of the bionic glue.

[0020] Preferably, the graphite substance includes graphite and / or graphene.

[0021] By adopting the above technical solution, the graphite substance has excellent thermal conductivity and flame - retardant properties, and at the same time has good thermal expansion performance, which can effectively repair the micro - cracks generated in building boards in a complex humid and hot environment. This self - repair ability significantly reduces the risk of interlayer separation and cracking of building boards, thereby improving the overall stability and service life of the boards, and is particularly suitable for high - end home decoration scenarios with high requirements for environmental protection and durability.

[0022] In the second aspect, this application provides a preparation method of graphite glutinous rice bionic glue, adopting the following technical solution: A preparation method of graphite glutinous rice bionic glue, comprising the following steps: S1. Ultrasonically blend and disperse the mineral complex and the graphite substance to obtain a mixture; S2. Add the plant fiber and the mixture to the glutinous rice extract, stir evenly to obtain graphite glutinous rice bionic glue.

[0023] By adopting the above technical solution, first, ultrasonic co-blending and dispersion treatment is carried out on the mineral complex and the graphite material, which can fully mix and disperse the mineral complex and the graphite material. Then, the plant fiber and the mixture are added to the glutinous rice extract and stirred evenly. By utilizing the adhesion and dispersion properties of the glutinous rice extract, the mixture and the plant fiber are evenly dispersed, and a bionic glue with good fluidity, uniformity and cohesion is prepared.

[0024] In a third aspect, the present application provides an application of the graphite glutinous rice bionic glue, adopting the following technical solution: An application of a graphite glutinous rice bionic glue, which is applied to building boards.

[0025] By adopting the above technical solution, the application of the graphite glutinous rice bionic glue in building boards can significantly improve the bonding strength and durability of the boards, and is particularly suitable for high-end home decoration with high performance requirements.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. The graphite glutinous rice bionic glue of the present application is compounded with glutinous rice extract, plant fiber, mineral complex and graphite material, uses bamboo fiber and / or linen fiber as the plant fiber, uses nano lithium magnesium silicate and / or nano magnesium aluminum silicate as the nano-level silicate, and uses wollastonite and / or calcite as the calcium-based material for compounding as the mineral complex. Each component cooperates with each other and is used in building boards, having good heat resistance, moisture resistance and environmental protection, good bonding stability. When used in a long-term complex hot and humid environment, problems such as interlayer swelling, cracking and separation of building boards are likely to occur, and it is suitable for high-end home decoration.

[0027] 2. By using an alkaline hydroxide aqueous solution, chitosan quaternary ammonium salt and 1-butyl-3-methylimidazolium acetate to modify the plant fiber, the fluffiness and adsorption of the plant fiber can be improved, the binding performance of the plant fiber with the mineral complex and the graphite material can be enhanced, and the heat and moisture resistance bonding performance of the bionic glue can be further improved.

[0028] 3. By using glutinous rice flour, water, an amylase composed of α-amylase and isoamylase and polyaspartic acid to prepare the glutinous rice extract, through the process of enzymatic hydrolysis and cooperation with polyaspartic acid, the problem that the bionic glue has low fluidity and cohesion due to the high amylopectin content in glutinous rice flour can be improved, the cohesion of the bionic glue can be enhanced, and further the adhesive stability of the bionic glue in a long-term hot and humid environment can be improved.

[0029] 4. Preparation method of the bionic glue of the present application: First, the mineral complex and the graphite material are blended and dispersed by ultrasonic waves, and then mixed with plant fibers and glutinous rice extract, ensuring the uniform dispersion and full reaction of each component, simplifying the process flow, improving production efficiency, being suitable for industrial production, and the viscosity stability of the prepared bionic glue is relatively good. Detailed implementation mode

[0030] 1. Plant fibers: Bamboo fibers, 1.1 - 1.5 dtex, with a length of 5 - 10 μm Flax fibers, 1.1 - 1.5 dtex, with a length of 5 - 10 μm; 2. Nanoscale silicate: Lithium magnesium silicate nanometer: particle size 20 - 50 nm Magnesium aluminum silicate nanometer; particle size 20 - 50 nm; 3. Calcium-based mineral: Wollastonite: particle size 0.5 - 2 μm Calcite: particle size 0.5 - 2 μm; 4. Chitosan quaternary ammonium salt: Pingju Biology, content 99%; 5. 1-Butyl-3-methylimidazolium acetate: CAS No. 284049-75-8, content 99%; 6. α-Amylase: Enzyme activity 100,000 u / g; 7. Isoamylase: Enzyme activity 100,000 u / g; 8. Polyaspartic acid: CAS No. 25608-40-6, Langbowan, content 98%; 9. Graphite material: Graphite 8000 mesh Graphene 8000 mesh.

[0031] Preparation example of modified plant fiber Preparation example 1 Preparation example 1 discloses a modified plant fiber, which is prepared by the following steps: 0.2 kg of chitosan quaternary ammonium salt and 0.5 kg of 1-butyl-3-methylimidazolium acetate are added to 8 kg of 5 wt% sodium hydroxide aqueous solution. After stirring evenly, 4 kg of bamboo fibers with a specification of 1.1 dtex and 5 μm are added as plant fibers, and the temperature is raised to 80 °C, stirred and soaked for 20 min, washed with water and dried to obtain the modified plant fiber.

[0032] Preparation examples 2 - 3 The differences between preparation examples 2 - 3 and preparation example 1 are that the raw material dosages and preparation conditions are different. See Table 1 below for details.

[0033] Table 1 Parameter table of preparation examples 1 - 3 Preparation example 4 Preparation Example 4 is different from Preparation Example 1 in that 1-butyl-3-methylimidazolium acetate is replaced with chitosan quaternary ammonium salt in equal amounts, and the others are the same as Preparation Example 1.

[0034] Preparation Example 5 Preparation Example 5 is different from Preparation Example 1 in that chitosan quaternary ammonium salt is replaced with chitosan in equal amounts, and the others are the same as Preparation Example 1.

[0035] Preparation Example 6 Preparation Example 6 is different from Preparation Example 1 in that 1-butyl-3-methylimidazolium acetate is replaced with γ-aminopropyltriethoxysilane in equal amounts, and the others are the same as Preparation Example 1.

[0036] Preparation Example of Glutinous Rice Extract Preparation Example 7 1 kg of glutinous rice flour and 10 kg of water were mixed evenly, 1 g of amylase (α-amylase and pullulanase = 1:0.2) was added for enzymatic hydrolysis, the enzymatic hydrolysis temperature was 40 °C, the enzymatic hydrolysis time was 2 h, and then 20 g of polyaspartic acid was added and mixed evenly to obtain glutinous rice extract.

[0037] Preparation Examples 8-9 Preparation Examples 8-9 are different from Preparation Example 1 in that the raw material dosages and preparation conditions are different. See Table 2 below for details.

[0038] Table 2 Parameter Table of Preparation Examples 7-9 Preparation Example 10 Preparation Example 10 is different from Preparation Example 7 in that the amylase consists of α-amylase and isoamylase with a weight ratio of 1:0.1, and the others are the same as Preparation Example 7.

[0039] Preparation Example 11 Preparation Example 11 is different from Preparation Example 7 in that the amylase consists of α-amylase and isoamylase with a weight ratio of 1:0.25, and the others are the same as Preparation Example 7.

[0040] Preparation Example 12 Preparation Example 12 is different from Preparation Example 7 in that 1 kg of glutinous rice flour and 10 kg of water were mixed evenly, 10 g of citric acid and 5 g of hydrogen peroxide were added for hydrolysis, the hydrolysis temperature was 40 °C, the hydrolysis time was 1 h, and then 20 g of polyaspartic acid was added and mixed evenly to obtain glutinous rice extract. Examples

[0041] Example 1 Example 1 discloses a graphite glutinous rice bionic glue, which is prepared by the following steps: S1. Ultrasonically blend and disperse 1.5 kg of mineral complex (composed of nano - magnesium aluminum silicate and wollastonite with a weight ratio of 2:1) and 0.01 kg of graphene as graphite substances, control the ultrasonic frequency at 40 kHz, and disperse for 30 min to obtain a mixture; S2. Add 2 kg of bamboo fibers with a specification of 1.1 dtex and 5 μm as plant fibers and the mixture obtained in step S1 to 6.49 kg of commercially available glutinous rice extract solution, stir for 40 min until evenly mixed to obtain graphite - glutinous rice bionic glue; The glutinous rice extract solution is prepared from glutinous rice extract and water in a weight ratio of 10:1. The glutinous rice extract is sourced from Woteles Biology and has a mesh number of 80 - 100.

[0042] Example 2 - 3 The differences between Example 2 - 3 and Example 1 lie in the raw material dosages and preparation conditions. See Table 3 below for details.

[0043] Table 3 Parameter table of Examples 1 - 3 Example 4 The difference between Example 4 and Example 1 is that the particle size of nano - magnesium aluminum silicate is 20 nm and the particle size of wollastonite is 0.5 μm, and the others are the same as Example 1.

[0044] Example 5 The difference between Example 5 and Example 1 is that the particle size of nano - magnesium aluminum silicate is 50 nm and the particle size of wollastonite is 2 μm, and the others are the same as Example 1.

[0045] Examples 6 - 8 The differences between Examples 6 - 8 and Example 5 lie in the sources of both plant fibers and glutinous rice extracts. See Table 4 below for details.

[0046] Table 4 Source table of plant fibers and glutinous rice extracts in Examples 6 - 8 Example Source of plant fiber Source of glutinous rice extract Example 6 Preparation Example 1 Preparation Example 7 Example 7 Preparation Example 2 Preparation Example 8 Example 8 Preparation Example 3 Preparation Example 9 Example 9 The difference between Example 9 and Example 6 is that the plant fibers are sourced from Preparation Example 4, and the others are the same as Example 6.

[0047] Example 10 The difference between Example 10 and Example 6 is that the plant fibers are sourced from Preparation Example 5, and the others are the same as Example 6.

[0048] Example 11 The difference between Example 11 and Example 6 is that the plant fibers are sourced from Preparation Example 6, and the others are the same as Example 6.

[0049] Example 12 The difference between Example 12 and Example 6 is that the glutinous rice extract is from Preparation Example 10, and the others are the same as Example 6.

[0050] Example 13 The difference between Example 13 and Example 6 is that the glutinous rice extract is from Preparation Example 11, and the others are the same as Example 6.

[0051] Example 14 The difference between Example 14 and Example 6 is that the glutinous rice extract is from Preparation Example 12, and the others are the same as Example 6.

[0052] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the mineral complex consists of aluminosilicate and wollastonite with a weight ratio of 2:1. The particle size of aluminosilicate is 100 nm, and the particle size of wollastonite is 200 nm. The others are the same as Example 1.

[0053] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that the mineral complex is diatomaceous earth with a particle size of 200 nm, and the others are the same as Example 1.

[0054] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that the dosage of plant fiber is 3 kg and the dosage of mineral complex is 0.5 kg, and the others are the same as Example 1.

[0055] Comparative Example 4 The difference between Comparative Example 4 and Example 1 is that graphene is replaced with the mineral complex in equal amount, and the others are the same as Example 1.

[0056] Performance Detection Test The following performance tests were carried out on the graphite glutinous rice glue prepared in Examples 1 - 14 and Comparative Examples 1 - 4: 1. Initial Gluing Strength Test The graphite glutinous rice bionic glue was coated on the wooden board at a coating amount of 100 g / m 2 . Two layers of wooden boards were bonded together and cured at 60 °C for 2 h to obtain a plywood with a thickness of 5 mm. Referring to the test method in GB / T 17657 - 2022 "Test Methods for Physical and Chemical Properties of Wood - Based Panels and Decorated Wood - Based Panels", the gluing strength (unit: MPa) of the plywood was tested, and the test results were tested and recorded; 2. Temperature - resistant Gluing Strength Test The graphite glutinous rice bionic glue was coated on the wooden board at a coating amount of 100 g / m 2The coating amount of [coating material] was coated on the wooden board. Two layers of wooden boards were bonded together and cured at 60 °C for 2 h to obtain a plywood with a thickness of 5 mm. The plywood was placed at 120 °C for 7 days. Referring to the test method in GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-Based Panels and Decorative Wood-Based Panels", the bonding strength of the plywood (unit: MPa) was tested, and the test results were tested and recorded; 3. Test of bonding strength under damp heat resistance The graphite-glutinous rice bionic glue was coated on the wooden board with a coating amount of 100 g / m 2 Two layers of wooden boards were bonded together and cured at 60 °C for 2 h to obtain a plywood with a thickness of 5 mm. The plywood was placed in a constant temperature and humidity chamber at 85 °C and 85% humidity for 7 days. Referring to the test method in GB / T 17657-2022 "Test Methods for Physical and Chemical Properties of Wood-Based Panels and Decorative Wood-Based Panels", the bonding strength of the plywood (unit: MPa) was tested, and the test results were tested and recorded; The following are the performance test data of the graphite-glutinous rice bionic glue prepared in Examples 1-14 and Comparative Examples 1-4. See Table 5 below for details.

[0057] Table 5 Performance test data table of Examples 1-14 and Comparative Examples 1-4 Combined with Examples 1-3, Examples 4-5, Comparative Examples 1-3 and Table 5, it can be concluded that compared with Example 1, Examples 4-5 further optimized the particle sizes of nano-silicate and calcium-based substances. The initial bonding strength of the prepared graphite-glutinous rice bionic glue was improved, and after the heat resistance and damp heat resistance tests, the decline rate of the bonding strength decreased. This may be because the nano-silicate and calcium-based substances with better particle sizes can produce better synergistic effects, which can enhance the cohesion of the graphite-glutinous rice glue, and then improve the heat resistance and damp heat resistance bonding performance of the graphite-glutinous rice glue. In Comparative Example 1, aluminum silicate was used as the nano-silicate, and in Comparative Example 2, diatomite was used as the mineral complex. The initial bonding strength of the prepared graphite-glutinous rice bionic glue was significantly reduced, and after the heat resistance and damp heat resistance tests, the decline rate of the bonding strength was significantly increased. In Comparative Example 3, the amount of plant fiber was increased, and the amount of the mineral complex was significantly reduced. After the heat resistance and damp heat resistance tests, the decline rate of the bonding strength of the prepared graphite-glutinous rice bionic glue was significantly increased, and obvious cracking occurred in the plywood. This may be because the reduction of the amount of the mineral complex reduced the synergistic dispersibility of the plant fiber and the graphite substance in the glutinous rice extract, and then significantly reduced the heat resistance and damp heat resistance of the graphite-glutinous rice bionic glue.

[0058] Combining Example 5 with Examples 6 - 14 and referring to Table 5, it can be concluded that using the modified plant fiber and glutinous rice extract of the present application can produce a better synergistic effect, and the prepared stone - ground glutinous rice bionic glue has a higher bonding strength, and the bonding strength can maintain good stability after the temperature resistance and damp - heat resistance tests. Compared with Example 6, in Examples 9 - 11, the preparation components of the modified plant fiber were changed, and the initial bonding strength of the prepared graphite glutinous rice bionic glue decreased, and the decline rate of the bonding strength after the temperature resistance and damp - heat resistance tests also increased. Compared with Example 6, in Examples 12 - 13, the types of amylase were further optimized. The initial bonding strength of the prepared graphite glutinous rice bionic glue increased, and the bonding strength showed a slight increase after the temperature resistance test, and the decline rate of the bonding strength after the damp - heat resistance test was also lower. It may be because the pullulanase in Example 6 excessively decomposed the branched starch in the glutinous rice flour, resulting in a decrease in the bonding strength of the prepared stone - ground glutinous rice glue. While the better - proportioned α - amylase and iso - amylase in Examples 12 - 13 can better optimize the proportion of branched starch and linear starch in the glutinous rice extract, thereby improving the bonding stability of the graphite glutinous rice bionic glue. Compared with Example 6, in Example 14, the enzymatic hydrolysis process in the preparation of the glutinous rice extract was changed, and then gelatinized with polyaspartic acid. The initial bonding strength of the prepared graphite glutinous rice bionic glue decreased, and the decline rate of the bonding strength after the temperature resistance and damp - heat resistance tests also increased. It may be that the preparation process of first hydrolyzing and then cooperating with polyaspartic acid reduced the bonding performance of the glutinous rice extract, resulting in a decrease in the bonding stability, further indicating that the glutinous rice extract prepared by the enzymatic hydrolysis of glutinous rice flour cooperating with polyaspartic acid in the present application can significantly improve the bonding stability of the bionic glue.

[0059] Furthermore, combining Example 1 with Comparative Example 4 and referring to Table 5, it can be concluded that using the graphite substance - mineral complex of the present application for compounding can improve the bonding stability of the prepared stone - ground glutinous rice glue. Compared with Example 1, in Comparative Example 4, the bonding stability decreased, and the cracking situation changed from slight cracking to cracking. It may be because the lack of graphite substance reduced the expansion self - repair performance of the graphite glutinous rice bionic glue in a high - temperature environment, thereby making the cracking situation more serious.

[0060] 4. Application Test 1) The following is an application test on the graphite glutinous rice glue prepared in Example 1, Example 6, and Comparative Example 2: The graphite glutinous rice bionic glue was coated on the wooden board at a coating amount of 100 g / m 2 The two layers of wooden boards were bonded together and cured at a temperature of 60 °C for 2 h to obtain a plywood with a thickness of 5 mm.

[0061] Referring to the test method in GB / T 9846-2015 "General Plywood", 6 specimens are taken, and the cumulative peeling length of each side of the same adhesive layer of each specimen does not exceed 25 mm. The impregnation peeling performance of the plywood is tested. If the number of qualified specimens is greater than or equal to 90% of the total number of specimens, it is qualified; referring to the test method in GB / T 39600-2021 "Classification of Formaldehyde Emission of Wood-Based Panels and Their Products", the formaldehyde emission (unit: mg / m 3 , 52 h) is tested; 2) The following is the application test of the graphite glutinous rice glue prepared in Example 1, Example 6 and Comparative Example 2: The graphite glutinous rice bionic glue is coated on the magnesium oxychloride board at a coating amount of 100 g / m 2 . Two layers of magnesium oxychloride boards are laminated and cured at 60 °C for 2 h to obtain a flame-retardant composite board with a thickness of 5 mm.

[0062] Referring to the test methods in GB 8624-2012 "Classification of the Burning Behavior of Building Materials and Products" and GB 20286-2006 "Requirements and Labels for the Burning Behavior of Flame-Retardant Products and Components in Public Places", the burning behavior grade of the flame-retardant composite board is tested.

[0063] The following are the application performance test data of the graphite glutinous rice glue prepared in Example 1, Example 6 and Comparative Example 2. For details, see Table 6 below.

[0064] Table 6 Application Performance Data Table of Example 1, Example 6 and Comparative Example 2 Combined with Example 1, Example 6 and Comparative Example 2 and Table 6, it can be concluded that the graphite glutinous rice glue prepared in this application is applied to plywood, which meets the impregnation peeling performance of plywood, and the formaldehyde emission is < 0.01 / mg / m 3 , far lower than the national standard ENF level ≤ 0.025 mg / m 3 ; when applied to the flame-retardant composite board, the burning performance reaches non-combustible A (A2-s1, d0, t0) level, and it has good applicability in building boards, especially suitable for high-end home decoration. The impregnation peeling performance of the plywood in Comparative Example 2 is unqualified, probably because the use of diatomite reduces the temperature resistance and moisture resistance bonding performance of the graphite glutinous rice bionic glue.

[0065] This specific embodiment is only an interpretation of the present application, and it is not a limitation of the present application. Those skilled in the art can make modifications to this embodiment without creative contributions according to needs after reading this specification, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A graphite-glutinous rice bionic glue, characterized in that, Prepared from the following raw materials by weight percentage: Glutinous rice extract 64.5 - 65% Plant fiber 10 - 20% Mineral complex 15 - 25% Graphite substance 0.1 - 0.5%; The mineral complex is composed of nanoscale silicate and calcium-based mineral with a weight ratio of (2 - 4):1; the nanoscale silicate is lithium magnesium silicate nanometer and / or magnesium aluminum silicate nanometer, the calcium-based mineral is wollastonite and / or calcite, and the plant fiber is bamboo fiber and / or linen fiber.

2. The graphite glutinous rice bionic glue according to claim 1, wherein The particle size of the nanoscale silicate is 20 - 50 nm; the particle size of the calcium-based substance is 0.5 - 2 µm.

3. The graphite glutinous rice bionic glue according to claim 1, wherein The plant fiber is modified plant fiber, and the modified plant fiber is prepared by the following steps: Add chitosan quaternary ammonium salt and 1-butyl-3-methylimidazolium acetate to an aqueous solution of 5 - 15 wt% alkaline hydroxide, stir evenly, add plant fiber, heat up to 60 - 80 °C, stir and soak for 20 - 40 min, wash with water and dry to obtain modified plant fiber.

4. The graphite glutinous rice bionic glue according to claim 3, characterized in that, The modified plant fiber is prepared from the following raw materials by weight: Plant fiber 4 - 6 parts 5 - 15 wt% aqueous solution of alkaline hydroxide 8 - 10 parts Chitosan quaternary ammonium salt 0.2 - 0.4 part 1-butyl-3-methylimidazolium acetate 0.3 - 0.5 part; The aqueous solution of alkaline hydroxide is any one of sodium hydroxide aqueous solution and potassium hydroxide aqueous solution.

5. The graphite glutinous rice bionic glue according to claim 4, wherein The specification of the plant fiber is 1.1 - 1.5 dtex and the length is 5 - 10 µm.

6. The graphite glutinous rice bionic glue according to claim 1, characterized in that, The glutinous rice extract is prepared by the following steps: Mix glutinous rice flour and water in a weight ratio of 1:(10 - 12), add 0.1 - 0.3 wt% of amylase based on the weight of glutinous rice flour for enzymatic hydrolysis, the enzymatic hydrolysis temperature is 40 - 50 °C, the enzymatic hydrolysis time is 1 - 2 h, then add 1 - 2 wt% of polyaspartic acid based on the weight of glutinous rice flour, mix evenly to obtain glutinous rice extract.

7. The graphite glutinous rice bionic glue according to claim 6, wherein The amylase is composed of α-amylase and isoamylase with a weight ratio of 1:(0.1 - 0.25).

8. The graphite glutinous rice bionic glue according to claim 1, characterized in that The graphite substance includes graphite and / or graphene.

9. A method for preparing the graphite-glutinous rice bionic glue according to any one of claims 1-8, characterized in that, Including the following steps: S1. Ultrasonically blend and disperse the mineral complex and the graphite substance to obtain a mixture; S2. Add the plant fiber and the mixture to the glutinous rice extract, stir evenly to obtain graphite glutinous rice bionic glue.

10. Use of the graphite-glutinous rice biomimetic glue according to any one of claims 1-8, characterized in that, Applied to building boards.

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