CN111675998A - Bean pulp adhesive for blockboard and preparation method thereof - Google Patents
Bean pulp adhesive for blockboard and preparation method thereof Download PDFInfo
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- CN111675998A CN111675998A CN202010629578.9A CN202010629578A CN111675998A CN 111675998 A CN111675998 A CN 111675998A CN 202010629578 A CN202010629578 A CN 202010629578A CN 111675998 A CN111675998 A CN 111675998A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J189/00—Adhesives based on proteins; Adhesives based on derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
- C08G83/002—Dendritic macromolecules
- C08G83/005—Hyperbranched macromolecules
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/325—Calcium, strontium or barium phosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2312/00—Crosslinking
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Abstract
The invention discloses a bean pulp adhesive for a core-board and a preparation method thereof, wherein the adhesive comprises the following components in parts by weight: 22-26 parts of soybean meal powder, 86 parts of dispersing agent, 2-3 parts of trypsin, 1-2 parts of composite viscosity regulator, 2-3 parts of branched polymer cross-linking agent and 0.04-0.04 part of calcium phosphate, and the preparation method comprises the following steps: K1. performing plasma treatment on the soybean meal powder in a nitrogen atmosphere, adding calcium chloride and a dispersing agent, performing ultrasonic treatment, adding trypsin for treatment at 50-60 ℃ for 20min, cooling, adding phosphoric acid, and uniformly stirring to obtain a first mixture; K2. after the calcium phosphate and the branched polymer cross-linking agent are added into the first mixture and uniformly stirred, the composite viscosity modifier is added and mixed, and the pH value is adjusted to 9.0, so that the bean pulp adhesive for the laminated wood board is obtained, the water-resistant bonding performance is good, and the practical performance of the adhesive and the durability of the laminated wood board prepared are ensured.
Description
Technical Field
The invention relates to the technical field of boards, and particularly relates to a bean pulp adhesive for a core-board and a preparation method thereof.
Background
China has abundant artificial forest resources, but the artificial forest resources cannot be directly used as materials of furniture and the like, artificial boards prepared from the fast growing wood of the artificial forest through an adhesive are main raw materials for furniture floors and indoor decoration in human living environments, and in recent years, the yield of the core-board in China is 1600 ten thousand cubic meters per year, wherein urea-formaldehyde resin and modified products thereof account for more than 90% of the total yield of the adhesive and dominate. The urea-formaldehyde resin adhesive is widely used in the wood industry due to the advantages of sufficient raw materials, low price, good water solubility and the like, but has the problem of formaldehyde release of products. With the improvement of living standard of people, people pay attention to the problem of environmental pollution. The problem of free formaldehyde emission of the artificial board prepared by adopting the bean pulp adhesive can be effectively solved, and the Chinese patent with the publication number of CN201710505045.8 discloses an adhesive for wooden furniture, but the problems of poor water-resistant adhesive bonding performance, poor manufacturability, easy mildew and the like limit the industrial application and the durability of the prepared artificial board.
Disclosure of Invention
In order to solve the problems, the invention provides the soybean meal adhesive for the core-board and the preparation method thereof, the waterproof bonding performance is good, and the practical performance of the adhesive and the durability of the core-board are ensured.
The technical scheme for solving the problem is that the bean pulp adhesive for the core-board comprises the following components in parts by weight: 22-26 parts of soybean meal powder, 86 parts of dispersing agent, 2-3 parts of trypsin, 1-2 parts of composite viscosity regulator, 2-3 parts of branched polymer cross-linking agent and 0.04-0.04 part of calcium phosphate;
the preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting phthalic acid, maleic anhydride and diethylenetriamine at 150 ℃, cooling and diluting to obtain a hyperbranched amino polymer;
s2, mixing epoxy chloropropane, a solvent and the hyperbranched amino polymer, reacting at 60 ℃, and adjusting the pH to 8 to obtain the branched polymer crosslinking agent.
Preferably, the protein content of the soybean meal powder is 43% -45%, and the particle size is 160 meshes.
Preferably, the dispersant is distilled water having a pH of 7.3 to 7.5.
Preferably, the composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite, and the mass ratio of the polyvinyl alcohol to the sodium carboxymethylcellulose to the bentonite is 1:1:5, so that the viscosity and initial viscosity of the adhesive can be increased.
Preferably, the molar ratio of the phthalic acid to the maleic anhydride to the diethylenetriamine is 9:1: 1.4.
Preferably, the mass fraction of the hyperbranched amino polymer is 25% -30%.
Preferably, the mass ratio of the epichlorohydrin to the solvent to the hyperbranched amino polymer is 2:3:1, and the solvent is water.
Also provides a preparation method of the bean pulp adhesive for the core-board, which comprises the following steps:
K1. performing plasma treatment on the soybean meal powder in a nitrogen atmosphere, adding calcium chloride and a dispersing agent, performing ultrasonic treatment, adding trypsin for treatment at 50-60 ℃ for 20min, cooling, adding phosphoric acid, and uniformly stirring to obtain a first mixture;
K2. and adding calcium phosphate and a branched polymer cross-linking agent into the first mixture, uniformly stirring, adding a composite viscosity regulator, mixing, and regulating the pH value to 9.0 to obtain the bean pulp adhesive for the core-board.
Preferably, the plasma treatment time in the step K1 is 10-15min, and the ultrasonic treatment time is 10-12 min.
The invention has the beneficial effects that:
1. the branched polymer cross-linking agent with flexible double ethylenic bonds is prepared from phthalic acid and maleic anhydride, so that on one hand, a flexible structure is favorable for forming a flexible reinforced structure in an adhesive, on the other hand, a hyperbranched structure is formed, the molecular weight of the adhesive is favorably increased, the viscosity is reduced, the two are favorable for eliminating stress, the bonding performance of the plywood is improved, the use amount of protein and the cross-linking agent can be reduced, and the cost is saved;
2. the protein of the soybean meal powder is subjected to synergistic treatment by using trypsin as a treating agent and ultrasonic, the trypsin is endopeptidase and has a selective hydrolysis effect on peptide chains of arginine and lysine, the molecular weight can be effectively regulated and controlled by utilizing specific chemical bond depolymerization, the intensity is prevented from being influenced by excessive degradation, on one hand, all components of the adhesive are uniformly dispersed, on the other hand, the protein spherical aggregate of the soybean meal powder can be effectively opened, the protein molecular weight of the soybean meal powder can be controllably regulated, and the uniformity and stability of an adhesive system are facilitated;
3. calcium chloride solution and phosphoric acid are synthesized and deposited on soybean protein molecules in situ, high-hardness calcium phosphate is formed by in-situ polymerization and is attached to the protein molecules, an external reinforcing structure can be formed with a protein cross-linking agent system, the conduction and dispersion of action load are facilitated, the hardness, water resistance and impact resistance of a glue layer are improved, and the cementing stability is improved;
4. by using the composite viscosity regulator, on one hand, the viscosity of the adhesive can be regulated, on the other hand, the cost of the tackifier is reduced, and meanwhile, the initial viscosity of the adhesive is improved, so that the adhesive has excellent coating performance, and both a brush and a glue spreader have excellent coating performance;
5. the branched polymer cross-linking agent disclosed by the invention is simple in synthetic process, high in efficiency, water-soluble, has a micro-phase separated hyperbranched structure and a uniform adhesive system, can be compatible with soybean meal and other components, and can be subjected to chemical reaction at a lower temperature, so that the cross-linking density of the soybean meal adhesive is improved, the bonding performance is enhanced, the uniformity of the adhesive is good, and the technological performance of the adhesive is good;
6. the soybean meal adhesive disclosed by the invention is high in reaction activity, adjustable in viscosity, good in initial viscosity, good in bonding force, excellent in prepressing property and bonding property, and meanwhile, the using amount of a protein raw material and the using amount of a cross-linking agent can be reduced, so that the cost of the adhesive is reduced; meanwhile, the hot-pressing temperature and time of the adhesive are reduced, and the manufacturability of the adhesive is enhanced;
7. the prepared soybean meal adhesive is free of toxic substances, and the raw materials, the preparation process and the final adhesive have the characteristics of high efficiency, no release of harmful substances, high reaction activity of products, good manufacturability and the like, and can be industrially applied.
Drawings
FIG. 1 shows the results of performance tests on three-ply plywood made with the adhesives described in examples 5 and 6 and comparative examples 1 to 4.
Detailed Description
In order to make the content of the present invention easier to understand, the technical solution of the present invention is further described below with reference to the specific embodiments, but the present invention is not limited thereto
Example 1
The bean pulp adhesive for the core-board comprises the following components: 22g of soybean meal powder, 86g of distilled water, 2g of trypsin, 1g of composite viscosity modifier, 2g of branched polymer cross-linking agent and 0.04g of calcium phosphate;
the preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting phthalic acid, maleic anhydride and diethylenetriamine at 150 ℃, cooling and diluting to obtain a hyperbranched amino polymer;
s2, mixing epoxy chloropropane, a solvent and the hyperbranched amino polymer, reacting at 60 ℃, and adjusting the pH to 8 to obtain the branched polymer crosslinking agent;
the composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Example 2
The bean pulp adhesive for the core-board comprises the following components: 26g of soybean meal powder with 43-45% of protein content and 160 meshes of particle size, 86g of distilled water with the pH value of 7.3-7.5, 3g of trypsin, 2g of composite viscosity regulator, 3g of branched polymer cross-linking agent and 0.08g of calcium phosphate;
the preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting 0.9mol of phthalic acid, 0.1mol of maleic anhydride and 1.4mol of diethylenetriamine at 150 ℃ for 3h, cooling, adding water for dilution to obtain a hyperbranched amino polymer, and adding water for dilution until the mass fraction of the hyperbranched amino polymer is 25%;
s2, mixing 25g of epoxy chloropropane, 50g of water and 50g of the hyperbranched amino polymer with the mass fraction of 25% at 60 ℃ for reaction, and adjusting the pH value to 8 to obtain the branched polymer crosslinking agent.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Example 3
The bean pulp adhesive for the core-board comprises the following components: 25g of soybean meal powder with 43-45% of protein content and 160 meshes of particle size, 86g of distilled water with the pH value of 7.3-7.5, 2.5g of trypsin, 1.5g of composite viscosity regulator, 2.5g of branched polymer cross-linking agent and 0.06g of calcium phosphate;
the preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting 1.8mol of phthalic acid, 0.2mol of maleic anhydride and 2.8mol of diethylenetriamine at 150 ℃ for 3h, cooling, adding water for dilution to obtain a hyperbranched amino polymer, and adding water for dilution until the mass fraction of the hyperbranched amino polymer is 30%;
s2, mixing 50g of epoxy chloropropane, 100g of water and 100g of the hyperbranched amino polymer with the mass fraction of 25% at 60 ℃ for reaction, and adjusting the pH value to 8 to obtain the branched polymer crosslinking agent.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Example 4
The bean pulp adhesive for the core-board comprises the following components: 25g of soybean meal powder with 43-45% of protein content and 160 meshes of particle size, 86g of distilled water with the pH value of 7.3-7.5, 2.5g of trypsin, 1.5g of composite viscosity regulator, 2.5g of branched polymer cross-linking agent and 0.06g of calcium phosphate;
the preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting 1.8mol of phthalic acid, 0.2mol of maleic anhydride and 2.8mol of diethylenetriamine at 150 ℃ for 3h, cooling, adding water for dilution to obtain a hyperbranched amino polymer, and adding water for dilution until the mass fraction of the hyperbranched amino polymer is 28%;
s2, mixing 50g of epoxy chloropropane, 100g of water and 100g of the hyperbranched amino polymer with the mass fraction of 28% for reaction at 60 ℃, and adjusting the pH value to 8 to obtain the branched polymer crosslinking agent.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Example 4
A preparation method of a bean pulp adhesive for a core-board comprises the following steps:
K1. carrying out plasma treatment on 26g of soybean meal powder with protein content of 43-45% and particle size of 160 meshes for 10min under the nitrogen atmosphere, then adding calcium chloride and 7.3-7.5 of distilled water, carrying out ultrasonic treatment for 10min, then adding trypsin for treatment for 20min at 50 ℃, adding phosphoric acid after cooling to room temperature, and uniformly stirring to obtain a first mixture;
K2. adding 0.06g of calcium phosphate and 2.5g of branched polymer cross-linking agent into the first mixture, uniformly stirring, adding 1.5g of composite viscosity modifier, mixing, and adjusting the pH to 9.0 to obtain the bean pulp adhesive for the core-board.
The preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting 1.8mol of phthalic acid, 0.2mol of maleic anhydride and 2.8mol of diethylenetriamine at 150 ℃ for 3h, cooling, adding water for dilution to obtain a hyperbranched amino polymer, and adding water for dilution until the mass fraction of the hyperbranched amino polymer is 30%;
s2, mixing 50g of epoxy chloropropane, 100g of water and 100g of the hyperbranched amino polymer with the mass fraction of 25% at 60 ℃ for reaction, and adjusting the pH value to 8 to obtain the branched polymer crosslinking agent.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Example 5
A preparation method of a bean pulp adhesive for a core-board comprises the following steps:
K1. carrying out plasma treatment on 22g of soybean meal powder with protein content of 43-45% and particle size of 160 meshes for 15min under the nitrogen atmosphere, then adding calcium chloride and 7.3-7.5 of distilled water, carrying out ultrasonic treatment for 15min, then adding trypsin for treatment for 20min at 60 ℃, adding phosphoric acid after cooling to room temperature, and uniformly stirring to obtain a first mixture;
K2. and adding 0.04g of calcium phosphate and 2g of branched polymer cross-linking agent into the first mixture, uniformly stirring, adding 1g of composite viscosity modifier, mixing, and adjusting the pH value to 9.0 to obtain the bean pulp adhesive for the core-board.
The preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting 1.8mol of phthalic acid, 0.2mol of maleic anhydride and 2.8mol of diethylenetriamine at 150 ℃ for 3h, cooling, adding water for dilution to obtain a hyperbranched amino polymer, and adding water for dilution until the mass fraction of the hyperbranched amino polymer is 30%;
s2, mixing 50g of epoxy chloropropane, 100g of water and 100g of the hyperbranched amino polymer with the mass fraction of 25% at 60 ℃ for reaction, and adjusting the pH value to 8 to obtain the branched polymer crosslinking agent.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Example 6
A preparation method of a bean pulp adhesive for a core-board comprises the following steps:
K1. performing plasma treatment on 24g of soybean meal powder with protein content of 43-45% and particle size of 160 meshes for 12min under the nitrogen atmosphere, then adding calcium chloride and 7.3-7.5 of distilled water, performing ultrasonic treatment for 12min, then adding trypsin for treatment for 20min at 55 ℃, adding phosphoric acid after cooling to room temperature, and uniformly stirring to obtain a first mixture;
K2. adding 0.06g of calcium phosphate and 2.5g of branched polymer cross-linking agent into the first mixture, uniformly stirring, adding 1.5g of composite viscosity modifier, mixing, and adjusting the pH to 9.0 to obtain the bean pulp adhesive for the core-board.
The preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting 1.8mol of phthalic acid, 0.2mol of maleic anhydride and 2.8mol of diethylenetriamine at 150 ℃ for 3h, cooling, adding water for dilution to obtain a hyperbranched amino polymer, and adding water for dilution until the mass fraction of the hyperbranched amino polymer is 30%;
s2, mixing 50g of epoxy chloropropane, 100g of water and 100g of the hyperbranched amino polymer with the mass fraction of 25% at 60 ℃ for reaction, and adjusting the pH value to 8 to obtain the branched polymer crosslinking agent.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Comparative example 1
A preparation method of a bean pulp adhesive for a core-board comprises the following steps:
K1. carrying out plasma treatment on 24g of soybean meal powder with protein content of 43-45% and particle size of 160 meshes for 12min under the nitrogen atmosphere, then adding calcium chloride and 7.3-7.5 of distilled water, carrying out ultrasonic treatment for 12min, cooling to room temperature, adding phosphoric acid, and uniformly stirring to obtain a first mixture;
K2. adding 0.06g of calcium phosphate and 2.5g of branched polymer cross-linking agent into the first mixture, uniformly stirring, adding 1.5g of composite viscosity modifier, mixing, and adjusting the pH to 9.0 to obtain the bean pulp adhesive for the core-board.
The preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting 1.8mol of phthalic acid, 0.2mol of maleic anhydride and 2.8mol of diethylenetriamine at 150 ℃ for 3h, cooling, adding water for dilution to obtain a hyperbranched amino polymer, and adding water for dilution until the mass fraction of the hyperbranched amino polymer is 30%;
s2, mixing 50g of epoxy chloropropane, 100g of water and 100g of the hyperbranched amino polymer with the mass fraction of 25% at 60 ℃ for reaction, and adjusting the pH value to 8 to obtain the branched polymer crosslinking agent.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Comparative example 2
A preparation method of a bean pulp adhesive for a core-board comprises the following steps:
K1. performing plasma treatment on 24g of soybean meal powder with protein content of 43-45% and particle size of 160 meshes for 12min under the nitrogen atmosphere, then adding calcium chloride and 7.3-7.5 of distilled water, performing ultrasonic treatment for 12min, then adding trypsin for treatment for 20min at 55 ℃, adding phosphoric acid after cooling to room temperature, and uniformly stirring to obtain a first mixture;
K2. adding 0.06g of calcium phosphate into the first mixture, uniformly stirring, adding 1.5g of the composite viscosity modifier, mixing, and adjusting the pH to 9.0 to obtain the bean pulp adhesive for the core-board.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Comparative example 3
A preparation method of a bean pulp adhesive for a core-board comprises the following steps:
K1. performing plasma treatment on 24g of soybean meal powder with protein content of 43-45% and particle size of 160 meshes for 12min under nitrogen atmosphere, adding 7.3-7.5 of distilled water, performing ultrasonic treatment for 12min, adding trypsin for treatment for 20min at 55 ℃, and uniformly stirring to obtain a first mixture;
K2. adding 2.5g of branched polymer cross-linking agent into the first mixture, uniformly stirring, adding 1.5g of composite viscosity modifier, mixing, and adjusting the pH value to 9.0 to obtain the bean pulp adhesive for the core-board.
The preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting 1.8mol of phthalic acid, 0.2mol of maleic anhydride and 2.8mol of diethylenetriamine at 150 ℃ for 3h, cooling, adding water for dilution to obtain a hyperbranched amino polymer, and adding water for dilution until the mass fraction of the hyperbranched amino polymer is 30%;
s2, mixing 50g of epoxy chloropropane, 100g of water and 100g of the hyperbranched amino polymer with the mass fraction of 25% at 60 ℃ for reaction, and adjusting the pH value to 8 to obtain the branched polymer crosslinking agent.
The composite viscosity regulator comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite in a mass ratio of 1:1: 5.
Three-layer plywood was prepared and tested for performance using the adhesives prepared in examples 5 and 6, the adhesives prepared in comparative examples 1 to 3, and a commercially available ordinary E0-grade urea formaldehyde resin adhesive as comparative example 4, wherein comparative example 1 is example 2 without a treatment agent, and comparative example 2 is example 2 without a crosslinking agent; comparative example 3 example 2 no reinforcing agent; comparative example 4 is a conventional E0 grade urea formaldehyde resin adhesive:
preparing three-layer plywood by using poplar veneers with the size of 40cm by 0.15cm and the adhesive as raw materials, wherein the water content of the poplar veneers is 15%, and the adhesive applying amount is 400g/m of double-sided adhesive applying amount2The pressure, the temperature and the time are respectively 0.8MPa and 120 ℃ for 7 minutes, the performance of the transverse spliced material product is detected according to the detection method of GB/T17657-1999 test method for physical and chemical properties of the artificial board and the facing artificial board, and the detection result is shown in figure 1.
Experimental results show that the bonding strength of the plywood prepared from the bean pulp adhesive for the core-board is detected to be more than 1.30MPa and the dry strength is detected to be more than 1.9MPa according to the II plywood, the stability of the adhesive prepared from the soybean protein adhesive is obviously improved, and the reinforcing effect is obvious.
Specific embodiments of the present invention have been described above in detail.
It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, any technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments in the prior art based on the inventive concept should be within the scope of protection defined by the claims.
Claims (9)
1. The bean pulp adhesive for the core-board is characterized by comprising the following components in parts by weight: 22-26 parts of soybean meal powder, 86 parts of dispersing agent, 2-3 parts of trypsin, 1-2 parts of composite viscosity regulator, 2-3 parts of branched polymer cross-linking agent and 0.04-0.08 part of calcium phosphate;
the preparation method of the branched polymer crosslinking agent comprises the following steps:
s1, reacting phthalic acid, maleic anhydride and diethylenetriamine at 150 ℃, cooling and diluting to obtain a hyperbranched amino polymer;
s2, mixing epoxy chloropropane, a solvent and the hyperbranched amino polymer, reacting at 60 ℃, and adjusting the pH to 8 to obtain the branched polymer crosslinking agent.
2. The bean pulp adhesive for the core-board as claimed in claim 1, wherein the protein content of the bean pulp powder is 43% -45%, and the particle size is 160 meshes.
3. The soybean meal adhesive for the core-board as claimed in claim 1, wherein the dispersant is distilled water having a pH of 7.3-7.5.
4. The soybean meal adhesive for the core-board as claimed in claim 1, wherein the composite viscosity modifier comprises polyvinyl alcohol, sodium carboxymethylcellulose and bentonite, and the mass ratio of the polyvinyl alcohol to the sodium carboxymethylcellulose to the bentonite is 1:1: 5.
5. The soybean meal adhesive for the core-board as claimed in claim 1, wherein the molar ratio of phthalic acid, maleic anhydride and diethylenetriamine is 9:1: 1.4.
6. The bean pulp adhesive for the core-board as claimed in claim 1, wherein the mass fraction of the hyperbranched amino polymer is 25% -30%.
7. The bean pulp adhesive for the laminated wood board as claimed in claim 1, wherein the mass ratio of the epichlorohydrin to the solvent to the hyperbranched amino polymer is 2:3:1, and the solvent is water.
8. The method for preparing the bean pulp adhesive for the laminated wood board according to claim 1, which comprises the following steps:
K1. performing plasma treatment on the soybean meal powder in a nitrogen atmosphere, adding calcium chloride and a dispersing agent, performing ultrasonic treatment, adding trypsin for treatment at 50-60 ℃ for 20min, cooling, adding phosphoric acid, and uniformly stirring to obtain a first mixture;
K2. and adding calcium phosphate and a branched polymer cross-linking agent into the first mixture, uniformly stirring, adding a composite viscosity regulator, mixing, and regulating the pH value to 9.0 to obtain the bean pulp adhesive for the core-board.
9. The method for preparing the bean pulp adhesive for the core-board as claimed in claim 8, wherein the plasma treatment time in the step K1 is 10-15min, and the ultrasonic treatment time is 10-12 min.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115029102A (en) * | 2022-06-14 | 2022-09-09 | 北京林业大学 | High-initial-viscosity plant protein adhesive and preparation method and application thereof |
| CN115322742A (en) * | 2021-05-11 | 2022-11-11 | 南京林业大学 | Keratin and calcium phosphate oligomer reinforced soybean adhesive and preparation method thereof |
| CN115895554A (en) * | 2022-11-17 | 2023-04-04 | 西南林业大学 | Full-biomass adhesive based on maleic anhydride and glycerol and preparation method and application thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115322742A (en) * | 2021-05-11 | 2022-11-11 | 南京林业大学 | Keratin and calcium phosphate oligomer reinforced soybean adhesive and preparation method thereof |
| CN115322742B (en) * | 2021-05-11 | 2023-12-01 | 南京林业大学 | Soybean adhesive enhanced by keratin and calcium phosphate oligomer and preparation method thereof |
| CN114231226A (en) * | 2021-12-27 | 2022-03-25 | 德华兔宝宝装饰新材股份有限公司 | Low-cost modified urea-formaldehyde resin adhesive |
| CN115029102A (en) * | 2022-06-14 | 2022-09-09 | 北京林业大学 | High-initial-viscosity plant protein adhesive and preparation method and application thereof |
| CN115029102B (en) * | 2022-06-14 | 2023-05-05 | 北京林业大学 | High-initial-viscosity plant protein adhesive and preparation method and application thereof |
| CN115895554A (en) * | 2022-11-17 | 2023-04-04 | 西南林业大学 | Full-biomass adhesive based on maleic anhydride and glycerol and preparation method and application thereof |
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