CN115595119A - High-prepressing-property waterproof mildew-proof antibacterial vegetable protein adhesive as well as preparation method and application thereof - Google Patents
High-prepressing-property waterproof mildew-proof antibacterial vegetable protein adhesive as well as preparation method and application thereof Download PDFInfo
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- 230000001070 adhesive effect Effects 0.000 title claims abstract description 55
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- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 230000000844 anti-bacterial effect Effects 0.000 title claims abstract description 10
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- IXPNQXFRVYWDDI-UHFFFAOYSA-N 1-methyl-2,4-dioxo-1,3-diazinane-5-carboximidamide Chemical compound CN1CC(C(N)=N)C(=O)NC1=O IXPNQXFRVYWDDI-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000000661 sodium alginate Substances 0.000 claims abstract description 31
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- 239000002612 dispersion medium Substances 0.000 claims abstract description 13
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 11
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 claims abstract description 9
- 229960001763 zinc sulfate Drugs 0.000 claims abstract description 9
- 229910000368 zinc sulfate Inorganic materials 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000007853 buffer solution Substances 0.000 claims description 10
- 238000004108 freeze drying Methods 0.000 claims description 8
- 235000012054 meals Nutrition 0.000 claims description 8
- FPQQSJJWHUJYPU-UHFFFAOYSA-N 3-(dimethylamino)propyliminomethylidene-ethylazanium;chloride Chemical compound Cl.CCN=C=NCCCN(C)C FPQQSJJWHUJYPU-UHFFFAOYSA-N 0.000 claims description 6
- NQTADLQHYWFPDB-UHFFFAOYSA-N N-Hydroxysuccinimide Chemical compound ON1C(=O)CCC1=O NQTADLQHYWFPDB-UHFFFAOYSA-N 0.000 claims description 6
- 235000018102 proteins Nutrition 0.000 claims description 6
- 108090000623 proteins and genes Proteins 0.000 claims description 6
- 102000004169 proteins and genes Human genes 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- BRLQWZUYTZBJKN-UHFFFAOYSA-N Epichlorohydrin Chemical compound ClCC1CO1 BRLQWZUYTZBJKN-UHFFFAOYSA-N 0.000 claims description 5
- 239000004952 Polyamide Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- HNXGGWNCFXZSAI-UHFFFAOYSA-N 2-morpholin-2-ylethanesulfonic acid Chemical compound OS(=O)(=O)CCC1CNCCO1 HNXGGWNCFXZSAI-UHFFFAOYSA-N 0.000 claims description 4
- 108010073771 Soybean Proteins Proteins 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 235000019710 soybean protein Nutrition 0.000 claims description 3
- CBOLARLSGQXRBB-UHFFFAOYSA-N 1-(oxiran-2-yl)-n,n-bis(oxiran-2-ylmethyl)methanamine Chemical compound C1OC1CN(CC1OC1)CC1CO1 CBOLARLSGQXRBB-UHFFFAOYSA-N 0.000 claims description 2
- MECNWXGGNCJFQJ-UHFFFAOYSA-N 3-piperidin-1-ylpropane-1,2-diol Chemical compound OCC(O)CN1CCCCC1 MECNWXGGNCJFQJ-UHFFFAOYSA-N 0.000 claims description 2
- 235000017060 Arachis glabrata Nutrition 0.000 claims description 2
- 244000105624 Arachis hypogaea Species 0.000 claims description 2
- 235000010777 Arachis hypogaea Nutrition 0.000 claims description 2
- 235000018262 Arachis monticola Nutrition 0.000 claims description 2
- 235000012343 cottonseed oil Nutrition 0.000 claims description 2
- 235000020232 peanut Nutrition 0.000 claims description 2
- 239000000843 powder Substances 0.000 claims description 2
- 238000005303 weighing Methods 0.000 claims description 2
- 239000002609 medium Substances 0.000 claims 1
- 239000011248 coating agent Substances 0.000 abstract description 14
- 238000000576 coating method Methods 0.000 abstract description 14
- 239000002023 wood Substances 0.000 abstract description 8
- 239000011120 plywood Substances 0.000 abstract description 7
- 230000003115 biocidal effect Effects 0.000 abstract description 3
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical group OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 abstract description 2
- 238000003754 machining Methods 0.000 abstract description 2
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- 238000012360 testing method Methods 0.000 description 5
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- 229910021641 deionized water Inorganic materials 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 229920000877 Melamine resin Polymers 0.000 description 3
- 238000007710 freezing Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- SXGZJKUKBWWHRA-UHFFFAOYSA-N 2-(N-morpholiniumyl)ethanesulfonate Chemical compound [O-]S(=O)(=O)CC[NH+]1CCOCC1 SXGZJKUKBWWHRA-UHFFFAOYSA-N 0.000 description 2
- 229960001126 alginic acid Drugs 0.000 description 2
- 235000010443 alginic acid Nutrition 0.000 description 2
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- 150000004781 alginic acids Chemical class 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000001878 scanning electron micrograph Methods 0.000 description 2
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 235000010450 Pino mugo Nutrition 0.000 description 1
- 241001136577 Pinus mugo Species 0.000 description 1
- 235000002914 Pinus uncinata Nutrition 0.000 description 1
- 241000219000 Populus Species 0.000 description 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 238000007112 amidation reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 239000010410 layer Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- -1 melamine modified urea formaldehyde resin Chemical class 0.000 description 1
- RCHKEJKUUXXBSM-UHFFFAOYSA-N n-benzyl-2-(3-formylindol-1-yl)acetamide Chemical compound C12=CC=CC=C2C(C=O)=CN1CC(=O)NCC1=CC=CC=C1 RCHKEJKUUXXBSM-UHFFFAOYSA-N 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229940001941 soy protein Drugs 0.000 description 1
- 229940071440 soy protein isolate Drugs 0.000 description 1
- 150000003751 zinc Chemical class 0.000 description 1
Images
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
- C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
- C08B37/0084—Guluromannuronans, e.g. alginic acid, i.e. D-mannuronic acid and D-guluronic acid units linked with alternating alpha- and beta-1,4-glycosidic bonds; Derivatives thereof, e.g. alginates
-
- 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
-
- 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
-
- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
Abstract
The invention provides a high-prepressing-property water-resistant mildew-proof antibacterial vegetable protein adhesive as well as a preparation method and application thereof. The adhesive comprises the following components in parts by mass: 20-30 parts of vegetable protein, 20-30 parts of cross-linking agent, 40-60 parts of dispersion medium, 1-2 parts of dopamine grafted sodium alginate and 0.2-0.5 part of zinc sulfate. The dopamine grafted sodium alginate prepared by the method contains a large number of catechol groups, so that the excellent initial adhesion and the interface adhesion with wood of the adhesive are greatly improved, and meanwhile, the excellent coating performance and prepressing performance of the adhesive are endowed, so that the vegetable protein adhesive bonded plywood is stable and the product machining performance is good. The vegetable protein adhesive provided by the invention has the advantages of good initial adhesion, good coating performance, high pre-pressing bonding strength, antibiosis, mildew resistance, good water resistance after curing, strong interface adhesion with wood, and excellent performance of the prepared plywood product.
Description
Technical Field
The invention relates to the technical field of organic materials and biomass adhesives, in particular to a high-prepressing-property waterproof, mildewproof and antibacterial plant protein adhesive as well as a preparation method and application thereof.
Background
The vegetable protein adhesive has wide application prospect due to the advantages of degradability, safety, environmental protection, renewability, rich raw materials and the like, and is expected to replace aldehyde resin to prepare green and environment-friendly wood products on a large scale. The traditional vegetable protein adhesive has poor water resistance, large molecular weight, poor initial viscosity and poor coating uniformity. The cross-linking modification can improve the water resistance of the traditional vegetable protein adhesive by consuming hydrophilic groups in vegetable protein and forming a compact cross-linking structure. However, the interface adhesion between the crosslinked and modified vegetable protein adhesive and wood is weak, and the problems of poor coating property, low prepressing property and uneven distribution of a cured adhesive layer still exist, so that the vegetable protein adhesive bonded plywood has poor stability and poor mechanical processing performance of products, does not have the characteristics of antibiosis and mildew resistance, and limits the large-scale industrial application of the plywood. The invention is inspired by topological adhesion, builds a 'bond-suture' molecular topological structure in a plant protein adhesive system to enhance the interface adhesion performance of the plant protein adhesive and wood, simultaneously solves the problems of poor coating prepressability and unstable bonding of the plant protein adhesive, and simultaneously expands the functionality of the plant adhesive.
Disclosure of Invention
The invention aims to provide a waterproof, mildewproof and antibacterial plant protein adhesive with excellent coating performance and prepressing performance as well as a preparation method and application thereof.
In order to achieve the purpose of the invention, in a first aspect, the invention provides a high-prepressing-property water-resistant mildew-resistant antibacterial plant protein adhesive, which comprises the following components in parts by mass: 20-30 parts of vegetable protein, 20-30 parts of cross-linking agent, 40-60 parts of dispersion medium, 1-2 parts of dopamine grafted sodium alginate and 0.2-0.5 part of zinc sulfate.
Preferably, 28 parts of vegetable protein, 28 parts of cross-linking agent, 44 parts of dispersion medium, 1-2 parts of dopamine grafted sodium alginate and 0.2-0.5 part of zinc sulfate.
Wherein the crosslinking agent can be selected from at least one of polyamide epichlorohydrin, trimethylolpropane triglycidyl ether, triglycidyl amine and the like.
The dispersion medium is water, preferably deionized water.
The vegetable protein can be at least one of water-soluble soybean protein meal, water-soluble cottonseed protein meal, water-soluble peanut protein meal and the like.
The vegetable protein content of the protein meal powder is 50-60% (preferably about 53%), and the particle size is 150-300 meshes (preferably about 200 meshes).
The preparation method of the dopamine grafted sodium alginate comprises the following steps:
(1) Adding 0.4-0.5g of sodium chloride and 2.5-3.5g of 2-morpholine ethanesulfonic acid into 150ml of dispersion medium at room temperature, uniformly stirring, and dropwise adding sodium hydroxide to adjust the pH value to 5-6 to obtain a buffer solution;
(2) Dissolving 8-9g of sodium alginate, 0.9-1.2g of 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride (EDC), 0.5-0.6g N-hydroxysuccinimide (NHS) and 4-5g of dopamine in the buffer solution, stirring for 15-25h at 20-30 ℃ under the condition of nitrogen, and freeze-drying to obtain the sodium alginate-coated tablet.
Preferably, the preparation method of the dopamine grafted sodium alginate comprises the following steps:
(1) Adding 0.438g of sodium chloride and 2.925g of 2-morpholine ethanesulfonic acid into 150ml of water at room temperature, uniformly stirring, and dropwise adding sodium hydroxide to adjust the pH value to 5.1 to obtain a buffer solution;
(2) Dissolving 8.91g of sodium alginate, 0.9585g of 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride, 0.5755g N-hydroxysuccinimide and 4.741g of dopamine in the buffer solution, stirring for 24h at 25 ℃ under the condition of nitrogen, and freeze-drying to obtain the sodium alginate-modified chitosan.
The conditions for freeze drying were: freezing the prepared dopamine grafted sodium alginate solution into a solid state at low temperature (-20 ℃ to-50 ℃), and then removing water in the solid state under the vacuum (1.3-13 Pa).
In a second aspect, the invention provides a preparation method of the adhesive, which comprises the following steps:
s1, weighing the components according to the weight ratio, dispersing the vegetable protein and the cross-linking agent in water at 20-30 ℃, and uniformly stirring to obtain a system I;
s2, uniformly dispersing the dopamine grafted sodium alginate in the system I, and stirring for 20-30min at 20-30 ℃ to obtain a system II;
s3, uniformly dispersing zinc sulfate in the system II, and stirring for 10-30min at 20-30 ℃ to obtain the zinc sulfate.
In a third aspect, the invention provides an application of the adhesive in artificial board processing.
Tests show that the vegetable protein adhesive prepared by the invention has good initial adhesion, good coating performance, high prepressing bonding strength, antibiosis and mildew resistance, good water resistance after curing, strong interface adhesion with wood, and excellent performance of the prepared plywood product.
By the technical scheme, the invention at least has the following advantages and beneficial effects:
the dopamine grafted sodium alginate is prepared by an amidation reaction and is used as a sewing material to form topological entanglement in a soybean protein network, so that the cohesive force of the adhesive is improved, and the water-resistant adhesive bonding performance of the adhesive is improved.
The dopamine grafted sodium alginate prepared by the method contains a large number of catechol groups, so that the excellent initial adhesion and the interface adhesion with wood of the adhesive are greatly improved, and meanwhile, the adhesive is endowed with excellent coating performance and prepressing performance, so that the vegetable protein adhesive bonded plywood is stable, and the product has good machining performance.
And thirdly, the introduction of the dopamine grafted sodium alginate and the zinc salt synergistically endows the adhesive with antibacterial property and mildew resistance.
And (IV) the high-performance environment-friendly plant protein adhesive prepared by the invention has no harmful substance release and can effectively promote the industrial application of the plant protein adhesive.
Drawings
FIG. 1 is a schematic representation of a preferred embodiment of the present invention 1 H NMR characterized the structure of dopamine grafted sodium alginate. Wherein, SA: sodium alginate, SD: dopamine grafted sodium alginate.
FIG. 2 is a scanning electron micrograph of a vegetable protein adhesive prepared according to a preferred embodiment of the present invention.
FIG. 3 is a graph showing the coating performance of the vegetable protein adhesive prepared in the preferred embodiment of the present invention.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention. Unless otherwise specified, the technical means used in the examples are conventional means well known to those skilled in the art, and the raw materials used are commercially available products.
The percent in the present invention means mass percent unless otherwise specified; but the percentage of the solution, unless otherwise specified, means that 100ml of the solution contains several grams of solute; the percentage between the liquids refers to the ratio of the volumes at 25 ℃.
The vegetable protein used in the following examples was soy protein isolate, obtained from Shandong mountain pine soy protein Co., ltd, having a particle size of 200 mesh and a protein content of 90% by mass.
The crosslinking agent used was polyamide epichlorohydrin, obtained from Shandong Tian chemical engineering Co., ltd., pH was about 4.5, and the solid content was 12.0wt%.
Zinc sulfate, sodium chloride, morpholine ethanesulfonic acid, sodium hydroxide, sodium alginate, 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride, N-hydroxysuccinimide, and dopamine were purchased from Tianjin Xiansi Biotech limited.
The dispersion medium used was deionized water.
Example 1 preparation of highly Preload Water-resistant, mold-resistant, and antibacterial vegetable protein adhesive
The embodiment provides a high-performance vegetable protein adhesive with excellent coating performance and prepressing performance and a preparation method thereof, wherein the adhesive is prepared according to the following weight ratio:
wherein the dispersion medium is deionized water.
The preparation method of the dopamine grafted sodium alginate comprises the following steps:
(1) 0.438g of sodium chloride and 2.925g of 2-morpholine ethanesulfonic acid were added to 150ml of water at room temperature, stirred uniformly, and sodium hydroxide was added dropwise to adjust the pH to 5.1 to obtain a buffer solution.
(2) 8.91g of sodium alginate, 0.9585g of 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride, 0.5755g N-hydroxysuccinimide and 4.741g of dopamine were dissolved in the above 150ml of buffer solution. Then stirred well under nitrogen at 25 ℃ for 24h.
(3) And (3) putting the uniformly stirred solution in the step (2) into a freeze dryer for freeze drying for 3 days to obtain the dopamine grafted alginic acid.
The conditions for freeze drying were: freezing the prepared dopamine grafted sodium alginate solution into a solid state at-40 ℃, and then removing water in the solid state under the vacuum condition of 1.3 Pa.
By passing 1 H NMR characterized the structure of dopamine grafted sodium alginate and the results are shown in figure 1.
The scanning electron micrograph of the vegetable protein adhesive prepared in this example is shown in FIG. 2. The microscopic scanning electron microscope result shows that the prepared vegetable protein adhesive has a compact cross-linked structure, and the water resistance of the vegetable protein adhesive is improved.
The coating properties of the vegetable protein adhesive prepared in this example are shown in fig. 3.
Example 2 preparation of highly Preload Water-resistant, mold-resistant, and antibacterial vegetable protein adhesive
The embodiment provides a high-performance vegetable protein adhesive with excellent coating performance and prepressing performance and a preparation method thereof, wherein the adhesive is prepared according to the following weight ratio:
wherein the dispersion medium is deionized water.
The preparation method of the dopamine grafted sodium alginate comprises the following steps:
(1) 0.476g of sodium chloride and 3.225g of 2-morpholinoethanesulfonic acid were added to 150ml of water at room temperature, stirred uniformly, and then sodium hydroxide was added dropwise to adjust the pH to 5.3 to obtain a buffer solution.
(2) 9g of sodium alginate, 1.085g of 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride, 0.5545g N-hydroxysuccinimide and 4.845g of dopamine were dissolved in the above 150ml of buffer solution. Then stirred well under nitrogen at 25 ℃ for 24h.
(3) And (3) putting the uniformly stirred solution obtained in the step (2) into a freeze dryer for freeze drying for 3 days to obtain the dopamine grafted alginic acid.
The conditions for freeze-drying were: freezing the prepared dopamine grafted sodium alginate solution into a solid state at-40 ℃, and then removing water in the solid state under the vacuum condition of 1.3 Pa.
Comparative examples 1 to 4:
comparative example 1 was a homogeneous mixture of 28g vegetable protein and 72g dispersion medium; the comparative example 2 is that 28g of vegetable protein, 44g of dispersion medium and 28g of crosslinking agent polyamide epichlorohydrin are uniformly mixed; and in the comparative example 3, 28g of vegetable protein, 44g of dispersion medium, 28g of cross-linking agent polyamide epichlorohydrin and 2g of sodium alginate are uniformly mixed. Comparative example 4 a melamine modified urea formaldehyde resin (grade E0, melamine 3% by weight of total adhesive) having a formaldehyde/(urea + melamine) molar ratio of 1.01 was purchased from knighty thousand forest wood ltd.
Test examples
Three-ply veneers were prepared using the adhesives of examples 1-2 and comparative examples 1-4, respectively, for bond strength testing.
Poplar veneer: drying until the water content is 12%; the dimensions 40cm by 0.15cm.
The preparation method comprises the following steps:
sizing: the glue coating amount is 180g/m 2 。
Pressure, temperature, time: 1MPa,120 ℃ and 6min.
The performance of the transverse spliced product is detected according to the detection method of GB/T17657-1999 physical and chemical properties experimental method of artificial board and facing artificial board.
Three-layer plywood prepared by the adhesives of examples 1-2 and comparative examples 1-4 of the invention respectively is subjected to prepressing performance test.
The preparation method comprises the following steps:
sizing: the glue coating amount is 180g/m 2 。
Pressure, temperature, time: 1MPa,25 ℃ and 2h.
Mildew resistance tests were carried out using the adhesives of examples 1-2 of the present invention and comparative examples 1-4, respectively.
10g of the binder was transferred to a petri dish and then stored in a constant temperature and humidity cabinet with a relative humidity of 80% and a temperature of 35 ℃.
The results of the above tests are shown in Table 1.
TABLE 1 Overall Properties of vegetable protein Adhesives
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (6)
1. The high-prepressing-property waterproof mildew-proof antibacterial vegetable protein adhesive is characterized by comprising the following components in parts by mass: 20-30 parts of vegetable protein, 20-30 parts of cross-linking agent, 40-60 parts of dispersion medium, 1-2 parts of dopamine grafted sodium alginate and 0.2-0.5 part of zinc sulfate;
the preparation method of the dopamine grafted sodium alginate comprises the following steps:
(1) Adding 0.4-0.5g of sodium chloride and 2.5-3.5g of 2-morpholine ethanesulfonic acid into 150ml of water at room temperature, uniformly stirring, and dropwise adding sodium hydroxide to adjust the pH value to 5-6 to obtain a buffer solution;
(2) Dissolving 8-9g of sodium alginate, 0.9-1.2g of 1- (3-dimethylaminopropyl) -3-ethylcarbodiimide hydrochloride, 0.5-0.6g N-hydroxysuccinimide and 4-5g of dopamine in the buffer solution, stirring at 20-30 ℃ for 15-25h under the nitrogen condition, and freeze-drying to obtain the sodium alginate-coated tablet.
2. The adhesive of claim 1, wherein the crosslinking agent is at least one of polyamide epichlorohydrin, trimethylolpropane triglycidyl ether, and triglycidyl amine.
3. The adhesive of claim 1 wherein the dispersing medium is water.
4. The adhesive according to claim 1, wherein the vegetable protein is at least one selected from water-soluble soybean protein meal, water-soluble cottonseed protein meal and water-soluble peanut protein meal;
the vegetable protein content in the protein meal powder is 50-60% by mass, and the particle size is 150-300 meshes.
5. A method for preparing the adhesive according to any one of claims 1 to 4, which is characterized by comprising the following steps:
s1, weighing the components according to the weight ratio, dispersing the vegetable protein and the cross-linking agent in a dispersion medium at the temperature of 20-30 ℃, and uniformly stirring to obtain a system I;
s2, uniformly dispersing the dopamine grafted sodium alginate in the system I, and stirring for 20-30min at 20-30 ℃ to obtain a system II;
s3, uniformly dispersing zinc sulfate in the system II, and stirring for 10-30min at 20-30 ℃ to obtain the zinc sulfate.
6. Use of the adhesive according to any one of claims 1 to 4 in the processing of artificial boards.
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