CN113861936B - Non-adhesive vegetable protein sucrose-based environment-friendly adhesive for plywood and preparation method and application thereof - Google Patents
Non-adhesive vegetable protein sucrose-based environment-friendly adhesive for plywood and preparation method and application thereof Download PDFInfo
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- CN113861936B CN113861936B CN202111195893.6A CN202111195893A CN113861936B CN 113861936 B CN113861936 B CN 113861936B CN 202111195893 A CN202111195893 A CN 202111195893A CN 113861936 B CN113861936 B CN 113861936B
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- 239000000853 adhesive Substances 0.000 title claims abstract description 71
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 69
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 title claims abstract description 49
- 229930006000 Sucrose Natural products 0.000 title claims abstract description 49
- 239000005720 sucrose Substances 0.000 title claims abstract description 49
- 239000011120 plywood Substances 0.000 title claims abstract description 41
- 108010082495 Dietary Plant Proteins Proteins 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims abstract description 39
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 36
- 235000018102 proteins Nutrition 0.000 claims abstract description 31
- 108090000623 proteins and genes Proteins 0.000 claims abstract description 31
- 102000004169 proteins and genes Human genes 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 235000012343 cottonseed oil Nutrition 0.000 claims abstract description 29
- 108010073771 Soybean Proteins Proteins 0.000 claims abstract description 23
- 235000019710 soybean protein Nutrition 0.000 claims abstract description 23
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 13
- LFVGISIMTYGQHF-UHFFFAOYSA-N ammonium dihydrogen phosphate Chemical compound [NH4+].OP(O)([O-])=O LFVGISIMTYGQHF-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910000387 ammonium dihydrogen phosphate Inorganic materials 0.000 claims abstract description 13
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 13
- 235000019837 monoammonium phosphate Nutrition 0.000 claims abstract description 13
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims abstract description 13
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims abstract description 13
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims abstract description 12
- HRZFUMHJMZEROT-UHFFFAOYSA-L sodium disulfite Chemical compound [Na+].[Na+].[O-]S(=O)S([O-])(=O)=O HRZFUMHJMZEROT-UHFFFAOYSA-L 0.000 claims abstract description 12
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims abstract description 12
- 229940001584 sodium metabisulfite Drugs 0.000 claims abstract description 12
- 235000010262 sodium metabisulphite Nutrition 0.000 claims abstract description 12
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004327 boric acid Substances 0.000 claims abstract description 11
- 239000006012 monoammonium phosphate Substances 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims description 66
- 238000003756 stirring Methods 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 235000010469 Glycine max Nutrition 0.000 claims description 10
- 244000068988 Glycine max Species 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 238000007731 hot pressing Methods 0.000 claims description 10
- 238000009775 high-speed stirring Methods 0.000 claims description 6
- 230000002209 hydrophobic effect Effects 0.000 claims description 6
- 235000012054 meals Nutrition 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000003208 petroleum Substances 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 239000004519 grease Substances 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000003960 organic solvent Substances 0.000 claims description 5
- 238000004513 sizing Methods 0.000 claims description 5
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 12
- 229920001807 Urea-formaldehyde Polymers 0.000 description 4
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 4
- QBKSWRVVCFFDOT-UHFFFAOYSA-N gossypol Chemical compound CC(C)C1=C(O)C(O)=C(C=O)C2=C(O)C(C=3C(O)=C4C(C=O)=C(O)C(O)=C(C4=CC=3C)C(C)C)=C(C)C=C21 QBKSWRVVCFFDOT-UHFFFAOYSA-N 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 238000001723 curing Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- -1 sodium dodecyl benzene sulfonate-boric acid Chemical compound 0.000 description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 108010064851 Plant Proteins Proteins 0.000 description 2
- QHOPXUFELLHKAS-UHFFFAOYSA-N Thespesin Natural products CC(C)c1c(O)c(O)c2C(O)Oc3c(c(C)cc1c23)-c1c2OC(O)c3c(O)c(O)c(C(C)C)c(cc1C)c23 QHOPXUFELLHKAS-UHFFFAOYSA-N 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 229930000755 gossypol Natural products 0.000 description 2
- 229950005277 gossypol Drugs 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001568 phenolic resin Polymers 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 235000021118 plant-derived protein Nutrition 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- NOEGNKMFWQHSLB-UHFFFAOYSA-N 5-hydroxymethylfurfural Chemical compound OCC1=CC=C(C=O)O1 NOEGNKMFWQHSLB-UHFFFAOYSA-N 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 239000002262 Schiff base Substances 0.000 description 1
- 150000004753 Schiff bases Chemical class 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000003945 anionic surfactant Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001728 carbonyl compounds Chemical class 0.000 description 1
- 230000003197 catalytic effect Effects 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 231100000481 chemical toxicant Toxicity 0.000 description 1
- 238000009223 counseling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- RJGBSYZFOCAGQY-UHFFFAOYSA-N hydroxymethylfurfural Natural products COC1=CC=C(C=O)O1 RJGBSYZFOCAGQY-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 235000004213 low-fat Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27D—WORKING VENEER OR PLYWOOD
- B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
- B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
- B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
-
- 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
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Veneer Processing And Manufacture Of Plywood (AREA)
Abstract
The invention discloses a vegetable protein sucrose-based environment-friendly adhesive for an impermeable plywood, which comprises the following components in parts by weight: 100 parts of sucrose; 20-40 parts of monoammonium phosphate; 3-4 parts of sodium metabisulfite; 2-4 parts of sodium carboxymethylcellulose; 0.03-1 part of sodium dodecyl benzene sulfonate; 4-5 parts of boric acid; 3-5 parts of potassium hydroxide; 0.5-2 parts of citric acid; 10-25 parts of defatted soybean protein; 10-25 parts of dephenolized cottonseed protein and 27-55 parts of water. The invention also discloses a preparation method of the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood and application of the vegetable protein sucrose-based environment-friendly adhesive in preparation of the plywood. The vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood, and the preparation method and the application thereof provided by the invention, improve the glue-permeable defect of the traditional sucrose-based adhesive for preparing the plywood, and obviously improve the glue-permeable problem of the surface of the board.
Description
Technical Field
The invention relates to a vegetable protein sucrose-based environment-friendly adhesive for an impermeable plywood, and a preparation method and application thereof, and belongs to the technical field of adhesives.
Background
At present, the wood adhesive in China still takes 'trialdehyde' adhesive as a main material, and comprises urea-formaldehyde resin, phenolic resin and melamine formaldehyde resin, wherein the urea-formaldehyde resin accounts for more than 80% of the total yield of the wood adhesive, and the urea-formaldehyde resin is still the variety with the largest manufacturing and using amount of the artificial board and accounts for about 60% -70% of the total yield. The urea-formaldehyde resin adhesive has sufficient raw materials and low price, the price is about 1/4-1/3 of the price of phenolic resin and melamine resin, and the price is 1/20-1/10 of the price of epoxy resin, unsaturated polyester resin and polyurethane. In addition, it has the advantages of high adhesion strength, light color of the cured adhesive layer, no pollution to the surface of the glued matter, high water compatibility, easy regulation of proper viscosity, concentration, etc. and may be used widely in timber industry. However, the artificial board produced by using the trialdehyde glue can continuously release formaldehyde in the manufacturing and using processes, the formaldehyde is a substance with higher toxicity, and the 2 nd position is high on a priority control list of toxic chemicals in China. Along with the increasing increase of indoor environmental awareness, health awareness and life quality awareness, people pay more and more attention to formaldehyde released by formaldehyde adhesive products in the using process, and the environmental protection problem is a serious problem today. On the other hand, the synthetic resin adhesive has strong dependence on petroleum, and along with the gradual shortage of petroleum resources in the global scope, the petroleum price is increased increasingly, so that the market cost of the petroleum-derived adhesive is increased sharply.
In addition, the conventional wood adhesive generally has the problems of insufficient compactness of the crosslinking structure and adhesive penetration of the adhesive, as shown in fig. 1, which is an electron microscope (SEM) observation of the cured sucrose-based (SADP) adhesive in the prior art, the SADP adhesive has large and numerous holes on the surface and does not form a compact adhesive layer; fig. 2 is a view showing a plywood prepared from a SADP sucrose-based adhesive in the prior art, and the black part in fig. 2 is oozed adhesive, which seriously affects the quality and appearance of the plywood product.
In view of the above, there is a need for an environment-friendly vegetable protein sucrose-based adhesive for plywood without adhesive permeation, and a preparation method and application thereof.
Disclosure of Invention
The invention aims to solve the technical problem of providing a vegetable protein sucrose-based environment-friendly adhesive for glue-impermeable plywood, and a preparation method and application thereof.
In order to solve the technical problems, the invention adopts the following technical scheme:
the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following components in parts by weight: 100 parts of sucrose; 20-40 parts of monoammonium phosphate; 3-4 parts of sodium metabisulfite; 2-4 parts of sodium carboxymethylcellulose; 0.03-1 part of sodium dodecyl benzene sulfonate; 4-5 parts of boric acid; 3-5 parts of potassium hydroxide; 0.5-2 parts of citric acid; 10-25 parts of defatted soybean protein; 10-25 parts of dephenolized cottonseed protein and 27-55 parts of water.
The solid content of the adhesive is 80.0-87.1%, and the viscosity range is 670-1280 mPas.
The water is distilled water.
The preparation method of the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following steps:
step one, mixing sucrose, citric acid and water, and stirring at a low speed for reacting for at least 0.3 hour;
adding ammonium dihydrogen phosphate into a reaction system, and stirring at a low speed for reacting for at least 0.2 hour;
adding sodium metabisulfite into the reaction system, and stirring and reacting for 0.5-1 hour;
step four, adding potassium hydroxide into the reaction system, and adjusting the environment of the reaction system to be alkaline;
fifthly, adding sodium carboxymethyl cellulose into the reaction system, and stirring at a low speed for 0.2-0.5 hour;
step six, adding defatted soybean protein and dephenolized cottonseed protein into the reaction system, and stirring at a low speed until the mixture is uniform;
and seventhly, adding sodium dodecyl benzene sulfonate and boric acid into the reaction system, and stirring at a high speed for 0.3-0.5 hour at room temperature.
The low-speed stirring is 180-220 r/min, and the high-speed stirring is 380-420 r/min; stirring at a low speed at room temperature; and step six, stirring for 0.2h.
The low-speed stirring is 180-220 r/min, and the high-speed stirring is 380-420 r/min; the first step is to stir at a low speed at 80-90 ℃ for 1-2 hours; step two, stirring at a low speed at a temperature of between 90 and 100 ℃ for reaction for 1 to 3 hours; step three, stirring at a high speed at 80-90 ℃; step four, adding potassium hydroxide when the temperature of the reaction system is reduced to 50-60 ℃; step five, adding sodium carboxymethylcellulose after the temperature of the reaction system is reduced to room temperature; and step six, stirring for 0.2h.
And step six, stirring at a low speed at 60-100 ℃ for 1-4 hours.
The preparation method of the defatted soybean protein comprises the following steps: taking soybean, flattening after heat treatment, extracting grease by using a hydrophobic low-boiling-point organic solvent at the extraction temperature of not more than 60 ℃, and removing the solvent to obtain defatted soybean protein;
the preparation method of the dephenolized cottonseed protein comprises the following steps: adding water into a proper amount of cottonseed meal, wherein the adding amount of the water is 4-5 times of that of the cottonseed meal, adding sodium carbonate, adjusting the pH value to be 8-9, keeping the temperature in a water bath at 55-60 ℃ for at least 3 hours, filtering, and taking solid matters to obtain the dephenolized cottonseed protein.
An application of vegetable protein sucrose-based environment-friendly adhesive for glue-impermeable plywood in preparing plywood.
The application method comprises the following steps: the adhesive is coated on the veneers, a plurality of layers of veneers are assembled based on a vertical texture mode, and the veneers are obtained through hot press molding, wherein the double-sided sizing amount is 140-220 g/m 2 The hot pressing temperature is 130-190 ℃, the pressure is 1-1.5 MPa, and the hot pressing time is 3-9 min.
The invention has the following beneficial effects:
the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood provided by the invention utilizes the catalytic action of monoammonium phosphate on the hydrolysis and caramelization reaction of sucrose in the synthesis process to form a low molecular weight prepolymer (comprising hydroxymethyl furfural, amino compounds, schiff base and the like, and the molecular weight range is 300-500); the addition of sodium dodecyl benzene sulfonate-boric acid reduces the protein molecular chain length of the plant protein, breaks the stable structure formed by hydrogen bonds between carbon-oxygen double bonds and nitrogen-hydrogen groups, ensures that more polyhydroxy in modified plant protein molecules are in intra-molecular or inter-molecular association, and ensures that acting force between protein molecular chains is changed after reaction; in the curing process, maillard reaction is carried out by utilizing carbonyl compounds of sucrose and amino compounds of vegetable proteins to generate chemical crosslinking reaction, the viscosity of the adhesive is moderate, the solid content can be 80.0-87.1%, the glue seepage defect of the traditional sucrose-based adhesive for preparing the plywood is overcome, and the heat curing rate and the gluing strength are improved.
The sodium dodecyl benzene sulfonate is an anionic surfactant, and the hydrophobic end of the surfactant can be combined with the hydrophobic group of the protein molecule to expand the protein molecule, so that a stable structure is formed in water, the wettability of the adhesive to wood is increased, and the water-resistant cementing performance of the adhesive is improved. The dispersion of the combination of sodium dodecyl benzene sulfonate and boric acid affects the tertiary-quaternary structure of the protein, and loose connection between domains is broken, so that the relative molecular mass of the protein is reduced.
Drawings
FIG. 1 is an electron microscope image of a sucrose-based (SADP) adhesive of the prior art after curing;
FIG. 2 is a diagram of a plywood made from a sucrose-based (SADP) adhesive of the prior art;
FIG. 3 is an electron microscope image of the adhesive of the present invention after curing;
fig. 4 is a diagram of a plywood made with the adhesive of the present invention.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Example 1
The vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following components in parts by weight: 100 parts of sucrose; 20 parts of monoammonium phosphate; 3 parts of sodium metabisulfite; 2 parts of sodium carboxymethylcellulose; 0.03 parts of sodium dodecyl benzene sulfonate; 4 parts of boric acid; 3 parts of potassium hydroxide; 0.5 parts of citric acid; 10 parts of defatted soybean protein; 10 parts of dephenolized cottonseed protein and 27 parts of water.
The solid content of the adhesive is 80.0%, and the viscosity is 670 Pa.s.
The water is distilled water.
The preparation method of the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following steps:
step one, mixing sucrose, citric acid and water, and stirring at a low speed at room temperature for reaction for 0.3 hour;
adding ammonium dihydrogen phosphate into a reaction system, and stirring at a low speed at room temperature for reaction for 0.2 hour;
adding sodium metabisulfite into the reaction system, and stirring at a low speed at room temperature for reaction for 0.5 hour;
step four, adding potassium hydroxide into the reaction system, and adjusting the environment of the reaction system to be alkaline;
step five, adding sodium carboxymethyl cellulose into the reaction system, and stirring at a low speed for 0.2 hour;
step six, adding defatted soybean protein and dephenolized cottonseed protein into the reaction system, and stirring at a low speed for 0.2 hour until the mixture is uniform;
and seventhly, adding sodium dodecyl benzene sulfonate and boric acid into the reaction system, and stirring at a high speed for 0.3 hour at room temperature.
The low-speed stirring is 180r/min, and the high-speed stirring is 380r/min.
The preparation method of the defatted soybean protein comprises the following steps: taking soybeans, flattening the soybeans after heat treatment, extracting grease by using a hydrophobic low-boiling-point organic solvent n-hexane at the extraction temperature of 60 ℃, and removing the solvent to obtain defatted soybean protein; the defatted soybean protein obtained by the method is granular, has high protein content, low fat content and low water content, and is easy to crush. The defatted soybean can be separated from the solvent at a low temperature, so that the protein denaturation is small.
The preparation method of the dephenolized cottonseed protein comprises the following steps: 400mL of water is added into 100g of cottonseed meal, sodium carbonate is added, the pH=8 is regulated, the water bath is kept at a constant temperature of 55 ℃, the temperature is 3 hours, and the solid is filtered to obtain the dephenolized cottonseed protein. The content of gossypol in the dephenolized protein liquid by the hot alkali method is only 0.012 percent, which is far lower than the content of free gossypol in cottonseed protein specified by the national counseling Commission by no more than 0.06 percent.
An application of vegetable protein sucrose-based environment-friendly adhesive for glue-impermeable plywood in preparing plywood.
The application method comprises the following steps: the adhesive is coated on the single boards, 3 layers of single boards are assembled based on a vertical texture mode, and hot press molding is carried out to obtain the plywood, wherein the double-sided sizing amount is 140g/m 2 The hot pressing temperature is 130 ℃, the pressure is 1MPa, and the hot pressing time is 3min.
Example 2
This embodiment differs from embodiment 1 only in that:
the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following components in parts by weight: 100 parts of sucrose; 40 parts of monoammonium phosphate; sodium metabisulfite 4 parts; 4 parts of sodium carboxymethylcellulose; 1 part of sodium dodecyl benzene sulfonate; 5 parts of boric acid; 5 parts of potassium hydroxide; 2 parts of citric acid; 25 parts of defatted soybean protein; 25 parts of dephenolized cottonseed protein and 55 parts of water.
The solid content of the adhesive is 87.1 percent, and the viscosity range is 1280 mPas.
The preparation method of the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following steps:
step one, mixing sucrose, citric acid and water, and stirring at a low speed at room temperature for reaction for 0.5 hour;
adding ammonium dihydrogen phosphate into a reaction system, and stirring at a low speed at room temperature for reaction for 0.5 hour;
adding sodium metabisulfite into the reaction system, and stirring at a low speed at room temperature for reaction for 1 hour;
step four, adding potassium hydroxide into the reaction system, and adjusting the environment of the reaction system to be alkaline;
step five, adding sodium carboxymethyl cellulose into the reaction system, and stirring at a low speed for 0.5 hour;
step six, adding defatted soybean protein and dephenolized cottonseed protein into the reaction system, and stirring at a low speed for 0.2 hour until the mixture is uniform;
and seventhly, adding sodium dodecyl benzene sulfonate and boric acid into the reaction system, and stirring at a high speed for 0.5 hour at room temperature.
The low-speed stirring is 220r/min, and the high-speed stirring is 420r/min.
The preparation method of the defatted soybean protein comprises the following steps: taking soybeans, flattening the soybeans after heat treatment, extracting grease by using a hydrophobic low-boiling-point organic solvent petroleum ether (boiling range 60-90 ℃), extracting at 50 ℃, and removing the solvent to obtain defatted soybean protein;
the preparation method of the dephenolized cottonseed protein comprises the following steps: adding 500mL of water into 100g of cottonseed meal, adding sodium carbonate, adjusting pH=9, keeping the water bath at a constant temperature of 60 ℃ for 4 hours, filtering, and taking solids to obtain dephenolized cottonseed protein.
An application of vegetable protein sucrose-based environment-friendly adhesive for glue-impermeable plywood in preparing plywood.
The application method comprises the following steps: the adhesive is coated on the single boards, 3 layers of single boards are assembled based on a vertical texture mode, and hot press molding is carried out to obtain the plywood, wherein the double-sided sizing amount is 220g/m 2 The hot pressing temperature is 190 ℃, the pressure is 1.5MPa, and the hot pressing time is 9min.
Example 3
The vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following components in parts by weight: 100 parts of sucrose; 30 parts of monoammonium phosphate; 3 parts of sodium metabisulfite; 4 parts of sodium carboxymethylcellulose; 0.05 parts of sodium dodecyl benzene sulfonate; 4.5 parts of boric acid; 4 parts of potassium hydroxide; 1 part of citric acid; 20 parts of defatted soybean protein; 15 parts of dephenolized cottonseed protein and 40 parts of water.
The solid content of the adhesive is 83.4%, and the viscosity range is 915 mPa.s.
The preparation method of the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following steps:
step one, mixing sucrose, citric acid and water, and stirring at a low speed at 80 ℃ for reaction for 1 hour;
adding ammonium dihydrogen phosphate into a reaction system, and stirring at a low speed at 90 ℃ for reaction for 1 hour;
adding sodium metabisulfite into the reaction system, and stirring at a high speed at 80 ℃ for reaction for 0.5 hour;
step four, adding potassium hydroxide into the reaction system when the temperature of the reaction system is reduced to 50 ℃, and adjusting the environment of the reaction system to be alkaline;
step five, adding sodium carboxymethylcellulose into the solution after the temperature of the reaction system is reduced to room temperature, and stirring at a low speed for 0.2 hour;
step six, adding defatted soybean protein and dephenolized cottonseed protein into a reaction system, and stirring at a low speed at 60 ℃ for 1 hour;
and seventhly, adding sodium dodecyl benzene sulfonate-boric acid into the reaction system, and stirring at a high speed for 0.3 hour at room temperature.
The low-speed stirring is 200r/min, and the high-speed stirring is 400r/min.
The preparation method of the defatted soybean protein comprises the following steps: taking soybeans, flattening the soybeans after heat treatment, extracting grease by using a hydrophobic low-boiling-point organic solvent n-hexane at the extraction temperature of 55 ℃, and removing the solvent to obtain defatted soybean protein;
the preparation method of the dephenolized cottonseed protein comprises the following steps: adding 450mL of water into 100g of cottonseed meal, adding sodium carbonate, adjusting the pH to be 8.5, keeping the water bath at the constant temperature of 60 ℃ for 3 hours, filtering, and taking solids to obtain the dephenolized cottonseed protein.
An application of vegetable protein sucrose-based environment-friendly adhesive for glue-impermeable plywood in preparing plywood.
The application method comprises the following steps: the adhesive is coated on the veneers, a plurality of layers of veneers are assembled based on a vertical texture mode, and the veneers are obtained through hot press molding, wherein the double-sided sizing amount is 180g/m 2 The hot pressing temperature is 160 ℃, the pressure is 1MPa, and the hot pressing time is 5min.
Example 4
This embodiment differs from embodiment 3 only in that:
the preparation method of the vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood comprises the following steps:
step one, mixing sucrose, citric acid and water, and stirring at a low speed at 90 ℃ for reaction for 2 hours;
adding ammonium dihydrogen phosphate into a reaction system, and stirring at a low speed at 100 ℃ for reaction for 3 hours;
adding sodium metabisulfite into the reaction system, and stirring at a high speed at 90 ℃ for reaction for 1 hour;
step four, adding potassium hydroxide into the reaction system when the temperature of the reaction system is reduced to 60 ℃, and adjusting the environment of the reaction system to be alkaline;
step five, adding sodium carboxymethylcellulose into the solution after the temperature of the reaction system is reduced to room temperature, and stirring for 0.5 hour at a low speed;
step six, adding defatted soybean protein and dephenolized cottonseed protein into the reaction system, and stirring at a low speed at 100 ℃ for 4 hours;
and seventhly, adding sodium dodecyl benzene sulfonate-boric acid into the reaction system, and stirring at a high speed for 0.5 hour at room temperature.
Example 5
This embodiment differs from embodiment 3 only in that: step six of example 3 was replaced by stirring at low speed for 0.2 hours until homogeneous.
As shown in fig. 3, the electron micrograph of the cured adhesive obtained according to the present invention, as can be seen from a Scanning Electron Microscope (SEM), although the present invention observes many round holes on the surface of the cured PP/SADP adhesive, it becomes smoother than the cured SADP, i.e., sucrose-based (SADP) adhesive in the prior art, indicating that the cured PP/SADP adhesive of the present invention has a tight crosslinked structure. Wherein PP represents a vegetable protein, SADP represents a sucrose-based sugar solution.
As shown in fig. 4, the adhesive prepared by the adhesive of the invention is not adhesive-penetrated, and the adhesive-penetrated problem on the surface of the board is obviously improved.
The foregoing is only a preferred embodiment of the invention, it being noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the invention.
Claims (5)
1. The vegetable protein sucrose-based environment-friendly adhesive for the glue-impermeable plywood is characterized by comprising the following components in parts by weight: 100 parts of sucrose; 40 parts of monoammonium phosphate; sodium metabisulfite 4 parts; 4 parts of sodium carboxymethylcellulose; 1 part of sodium dodecyl benzene sulfonate; 5 parts of boric acid; 5 parts of potassium hydroxide; 2 parts of citric acid; 25 parts of defatted soybean protein; 25 parts of dephenolized cottonseed protein and 55 parts of water;
the solid content of the adhesive is 87.1 percent, and the viscosity is 1280 mPa.s;
the preparation method comprises the following steps:
step one, mixing sucrose, citric acid and water, and stirring at a low speed at room temperature for reaction for 0.5 hour;
adding ammonium dihydrogen phosphate into a reaction system, and stirring at a low speed at room temperature for reaction for 0.5 hour;
adding sodium metabisulfite into the reaction system, and stirring at a low speed at room temperature for reaction for 1 hour;
step four, adding potassium hydroxide into the reaction system, and adjusting the environment of the reaction system to be alkaline;
step five, adding sodium carboxymethyl cellulose into the reaction system, and stirring at a low speed for 0.5 hour;
step six, adding defatted soybean protein and dephenolized cottonseed protein into the reaction system, and stirring at a low speed for 0.2 hour until the mixture is uniform;
and seventhly, adding sodium dodecyl benzene sulfonate and boric acid into the reaction system, and stirring at a high speed for 0.5 hour at room temperature.
2. The non-adhesive vegetable protein sucrose-based environment-friendly adhesive for plywood as claimed in claim 1, wherein the low-speed stirring is 220r/min and the high-speed stirring is 420r/min.
3. The vegetable protein sucrose-based environment-friendly adhesive for glue-impermeable plywood, according to claim 1, wherein the preparation method of the defatted soybean protein is as follows: taking soybeans, flattening the soybeans after heat treatment, extracting grease by using a hydrophobic low-boiling-point organic solvent petroleum ether with the boiling range of 60-90 ℃, extracting at the temperature of 50 ℃, and removing the solvent to obtain defatted soybean protein;
the preparation method of the dephenolized cottonseed protein comprises the following steps: adding 500mL of water into 100g of cottonseed meal, adding sodium carbonate, adjusting the pH to be 9, keeping the water bath at the constant temperature of 60 ℃ for 4 hours, filtering, and taking solids to obtain the dephenolized cottonseed protein.
4. The use of a vegetable protein sucrose-based environment-friendly adhesive for glue-impermeable plywood as claimed in claim 1 in the preparation of plywood.
5. The use according to claim 4, wherein the application method is: the adhesive is coated on the veneers, 3 layers of veneers are assembled based on a vertical texture mode, hot press molding is carried out, and the plywood is obtained, and double-sided sizing is carried outThe amount is 220g/m 2 The hot pressing temperature is 190 ℃, the pressure is 1.5MPa, and the hot pressing time is 9min.
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| CN101812282A (en) * | 2010-04-30 | 2010-08-25 | 东北林业大学 | Method for preparing water-resistant soybean isolated protein adhesive |
| CN102031084A (en) * | 2010-11-26 | 2011-04-27 | 东北林业大学 | Preparation method of bacteriostatic isolated soy protein adhesive |
| CN110684485A (en) * | 2019-10-30 | 2020-01-14 | 南京林业大学 | Environment-friendly adhesive with ultrahigh solid content for plywood, preparation method and application thereof |
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| CN101812282A (en) * | 2010-04-30 | 2010-08-25 | 东北林业大学 | Method for preparing water-resistant soybean isolated protein adhesive |
| CN102031084A (en) * | 2010-11-26 | 2011-04-27 | 东北林业大学 | Preparation method of bacteriostatic isolated soy protein adhesive |
| CN110684485A (en) * | 2019-10-30 | 2020-01-14 | 南京林业大学 | Environment-friendly adhesive with ultrahigh solid content for plywood, preparation method and application thereof |
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