CN107033832B - Formaldehyde-free composite adhesive for artificial board and preparation method thereof - Google Patents
Formaldehyde-free composite adhesive for artificial board and preparation method thereof Download PDFInfo
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- CN107033832B CN107033832B CN201710332752.1A CN201710332752A CN107033832B CN 107033832 B CN107033832 B CN 107033832B CN 201710332752 A CN201710332752 A CN 201710332752A CN 107033832 B CN107033832 B CN 107033832B
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3215—Polyhydroxy compounds containing aromatic groups or benzoquinone groups
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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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3225—Polyamines
- C08G18/3228—Polyamines acyclic
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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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/36—Hydroxylated esters of higher fatty acids
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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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
- C08G18/6415—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63 having nitrogen
- C08G18/6446—Proteins and 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/6505—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6523—Compounds of group C08G18/3225 or C08G18/3271 or polyamines of C08G18/38
- C08G18/6529—Compounds of group C08G18/3225 or polyamines of C08G18/38
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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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/6547—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen the low-molecular compounds being compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
-
- 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
Abstract
The invention relates to an aldehyde-free composite adhesive for artificial boards and a preparation method thereof; the feed is prepared from the following raw materials in parts by weight: 80-120 parts of cottonseed meal, 800-1200 parts of deionized water, 5-10 parts of ammonia water, 4-8 parts of hydrochloric acid, 10-20 parts of natural modifier, 20-40 parts of urea, 10-30 parts of gelatin powder, 20-30 parts of crosslinking enhancer and 10-15 parts of filler; the preparation process of the invention does not add harmful substances such as formaldehyde, and the glued artificial board does not release formaldehyde and pollute the indoor environment; by using the cottonseed oil extraction processing byproduct as a raw material, the production cost is saved, the supply and demand contradiction of the soybean protein raw material is favorably relieved, and the cohesive strength and the waterproofness of the adhesive are improved; the raw materials are from renewable resources, and accord with the principles of environmental protection and sustainable development.
Description
Technical Field
The invention relates to a wood adhesive and a preparation method thereof, in particular to an aldehyde-free composite adhesive for an artificial board and a preparation method thereof.
Background
In recent years, the artificial board industry in China is rapidly developed, and the yield in 2015 year is 2.87 billion cubic meters. With the increasing awareness of the public on household environmental protection, the requirements of national and industrial standards on the formaldehyde release limit of artificial board products are gradually strict, the environmental protection grade requirements of the products reach E1 grade, and part of the products approach the E0 grade formaldehyde limit requirements. Because the adhesive used by the artificial board is mainly formaldehyde thermosetting resin, the structural characteristics of the adhesive determine how to improve the process technology, and certain formaldehyde release exists both theoretically and practically. Therefore, research and development of formaldehyde-free additive adhesives with excellent performance are fundamental ways to solve the problem of formaldehyde.
The preparation of bio-based non-formaldehyde adhesives from plant and animal proteins is a hot spot of the current research, mainly focuses on the research of soy protein adhesives, and is usually prepared by adding a cross-linking agent and an auxiliary agent into soybean flour or soy protein, and the soy protein is converted into a reticular cross-linked structure with the characteristics of synthetic resin by modifying and chemically modifying a soybean product (soybean flour or isolated soy protein). The soybean product can also be used as a filler or modifier of synthetic resin, so that the release amount of volatile substances such as formaldehyde and the like is reduced, the content of renewable components in the adhesive is increased, and the cost is reduced.
The soybean meal which is the main raw material of the soybean protein adhesive is the plant protein raw material with the largest dosage at present, the soybean meal is mainly used for producing protein feed, the gap of the raw materials of the protein feed in China is about 2400 ten thousand tons in 2015, and the gap reaches 4000 ten thousand tons in 2020 according to prediction, so that the development and utilization of other protein resources have important significance. From the actual situation at present, the soybean meal is pretty, but the utilization rate of the cottonseed meal is not high. In 2015, the market price of the soybean meal is 2767 yuan/ton, the market price of the cottonseed meal is 2305 yuan/ton, and the cottonseed meal has great development potential as an ideal and new protein adhesive raw material.
The annual production of 800-ten thousand tons of cotton seeds in China comprises about 50-55% of cotton seeds, 30-35% of oil and 35-38% of protein. The cottonseed meal is a byproduct obtained by extracting oil from cottonseed by pre-pressing extraction or direct solvent extraction, the protein content can reach more than 50%, but the cottonseed meal is not effectively utilized all the time, the main reason is that the cottonseed meal contains gossypol which can affect the growth of animals after being eaten, so that the addition amount of the cottonseed meal in the feed is only 3% -4%, and the cottonseed meal is returned to the field as fertilizer in many places. The dephenolized cottonseed protein can be directly produced from the cottonseed by a dephenolizing technology to serve as a high-quality protein feed, but the dephenolized cottonseed protein can be directly utilized as a wood adhesive synthesis raw material without a dephenolizing process.
Disclosure of Invention
In order to solve the problems, the invention provides an aldehyde-free composite adhesive for an artificial board and a preparation method thereof; the composite wood adhesive is prepared from the non-dephenolized cottonseed meal serving as a main raw material, is simple in process operation, excellent in adhesive bonding performance, free of aldehyde and environment-friendly, and the preparation method of the composite wood adhesive.
The invention adopts the following technical scheme:
an aldehyde-free composite adhesive for artificial boards is prepared from the following raw materials in parts by weight:
80-120 parts of cottonseed meal, 800 parts of deionized water, 1200 parts of ammonia water, 5-10 parts of hydrochloric acid, 4-8 parts of natural modifier, 20-40 parts of urea, 10-30 parts of gelatin powder, 20-30 parts of crosslinking reinforcing agent and 10-15 parts of filler.
The natural modifier is vegetable oil polyalcohol;
the preparation method of the vegetable oil polyalcohol comprises the following steps: reacting vegetable oil and peroxy acid in a solvent for 2-4 hours at 50-60 ℃ to generate epoxidized vegetable oil, reacting the epoxidized vegetable oil with alcohol, deionized water and a catalyst for 1-2 hours under boiling, and neutralizing a product with a weak alkaline substance to obtain vegetable oil-based polyol; the viscosity of the vegetable oil-based polyol is 2000-5000mPa & s, and the hydroxyl value is 150-220 mgKOH/g.
The vegetable oil is one or more of cotton seed oil, soybean oil, rapeseed oil, castor oil, olive oil, sesame oil, safflower oil, linseed oil, rice bran oil or palm oil.
The peroxy acid is one or more of peroxyformic acid, peroxyacetic acid, trichloroperoxyacetic acid or benzyloxy peroxyformic acid.
The solvent is one or more of formic acid, acetic acid or chloroform.
The alcohol is one of four mixtures of methanol and isopropanol, chloroform, formic acid or acetic acid, and the proportion of the methanol in each mixture is not higher than 20% by volume.
The catalyst is one of sulfuric acid, phosphoric acid, hydrochloric acid, fluoroboric acid, p-toluenesulfonic acid or acid activated bentonite or montmorillonite.
The weak alkaline substance is one of ammonia water, calcium carbonate, sodium bicarbonate or magnesium carbonate.
The crosslinking reinforcing agent is one or more of toluene diisocyanate, diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate, isophorone diisocyanate or polymethylene polyphenyl isocyanate blocked by sodium bisulfite or a mixture of sodium bisulfite and ethyl acetoacetate.
The filler is one or more of flour, starch, tapioca flour, diatomite, kaolin, bentonite, talcum powder, wood powder or cellulose powder.
The invention also relates to a method for preparing the aldehyde-free composite adhesive, which comprises the following steps:
(1) and drying the oil-extracted cottonseed meal, grinding the cottonseed meal by using a grinder, and screening the cottonseed meal by using a 100-mesh screen to obtain ground cottonseed meal.
(2) Adding deionized water, ground cotton meal powder and ammonia water into a reaction kettle, stirring for 1 hour, centrifuging (3500r/min) for 15 minutes, taking supernate, adding hydrochloric acid, stirring for 20 minutes, and centrifuging (3500r/min) for 15 minutes to obtain the cottonseed protein curd.
(3) Adding deionized water, natural modifier and urea into a reaction kettle, heating to 60-70 ℃, adding the cottonseed protein curd, stirring to completely dissolve the cottonseed protein curd, adding gelatin powder, and stirring to dissolve to obtain the main agent.
(4) When in use, the main agent, the crosslinking reinforcing agent and the filler are uniformly mixed.
The aldehyde-free composite adhesive prepared by the invention has the following characteristics:
(1) harmful substances such as formaldehyde and the like are not added in the preparation process, and the glued artificial board does not release formaldehyde and pollute the indoor environment;
(2) the cottonseed oil extraction processing byproduct is used as the raw material, so that the production cost is saved, the supply and demand contradiction of the soybean protein raw material is relieved, the added value of the product is improved, the raw material is from renewable resources, and the principle of environmental protection and sustainable development is met;
(3) the modifier is polyol prepared by modifying vegetable oil, has higher functionality, is beneficial to increasing the crosslinking density of a curing adhesive layer, and the long fatty carbon chain of the modifier is beneficial to improving the hydrolytic stability of the adhesive and endowing the adhesive with certain toughness. The raw materials are from renewable resources, and accord with the principles of environmental protection and sustainable development;
(4) the adopted crosslinking reinforcing agent is blocked isocyanate, so that the working life of the adhesive after glue mixing can be prolonged, and different requirements of factories are met. The blocked isocyanate releases isocyanate groups at 70-100 ℃, and can meet the hot pressing requirement of the artificial board. The isocyanate group can react with the groups in the vegetable oil-based polyol, urea, gossypol and cottonseed protein to generate a net-shaped cross-linked structure which penetrates through the molecular structure of the protein, so that the cohesive strength and the waterproofness of the adhesive are improved.
(5) The adhesive prepared by the invention has proper viscosity and storage period, and the glued plywood can meet the requirements of type II plywood in the national standard GB17657-1999 Experimental method for physical and chemical properties of artificial boards and decorative artificial boards.
Detailed Description
The preparation method of the vegetable oil polyol described in this embodiment is as follows: the amount of each component described in this example is in parts by weight:
reacting 10 parts of cottonseed oil and 20 parts of peroxyformic acid in 200 parts of formic acid at 50-60 ℃ for 3 hours to generate epoxidized cottonseed oil, reacting 10 parts of epoxidized cottonseed oil with 15 parts of alcohol (a mixture of methanol and isopropanol in a volume ratio of 1: 5), 80 parts of deionized water and 3 parts of p-toluenesulfonic acid under boiling for 1.5 hours, and neutralizing the product with ammonia water to obtain the cottonseed oil-based polyol. The viscosity of the obtained cottonseed oil-based polyol was 3850 mPas, and the hydroxyl value was 205 mgKOH/g.
Example 1:
and drying 80 parts of the cottonseed meal after oil extraction, grinding the cottonseed meal by using a grinder, and screening the cottonseed meal by using a 100-mesh screen to obtain ground cottonseed meal. Adding 800 parts of deionized water, 80 parts of ground cotton cake powder and 5 parts of ammonia water into a reaction kettle, stirring at room temperature for 1 hour, centrifuging at the speed of 3500r/min for 15 minutes, taking supernate, adding 4 parts of hydrochloric acid, stirring for 20 minutes, and centrifuging at the speed of 3500r/min for 15 minutes to obtain the centrifuged cotton seed protein curd. Adding 200 parts of deionized water, 10 parts of cottonseed oil modified polyol and 20 parts of urea into a reaction kettle, heating to 60-70 ℃, adding cottonseed protein curd, stirring to completely dissolve the cottonseed protein curd, adding 10 parts of gelatin powder, and stirring and dissolving to obtain the main agent. When the adhesive is used, 20 parts of blocked polydiphenylmethane diisocyanate and 10 parts of flour are added into the main agent and uniformly mixed to obtain the composite adhesive. The performance index of the adhesive is shown in table 1.
Example 2:
and drying 100 parts of the cottonseed meal after oil extraction, grinding the cottonseed meal by using a grinder, and screening the cottonseed meal by using a 100-mesh screen to obtain ground cottonseed meal. Adding 900 parts of deionized water, 90 parts of ground cotton cake powder and 10 parts of ammonia water into a reaction kettle, stirring at room temperature for 1 hour, centrifuging at the speed of 3500r/min for 15 minutes, taking supernate, adding 8 parts of hydrochloric acid, stirring for 20 minutes, and centrifuging at the speed of 3500r/min for 15 minutes to obtain the centrifuged cotton cake. Adding 300 parts of deionized water, 15 parts of soybean oil modified polyol and 25 parts of urea into a reaction kettle, heating to 60-70 ℃, adding cottonseed protein curd, stirring to completely dissolve the cottonseed protein curd, adding 15 parts of gelatin powder, and stirring and dissolving to obtain the main agent. When the adhesive is used, 25 parts of blocked polymethylene polyphenyl isocyanate and 15 parts of starch are added into a main agent and uniformly mixed to obtain the composite adhesive. The performance index of the adhesive is shown in table 1.
Example 3:
and drying 120 parts of the cottonseed meal after oil extraction, grinding the cottonseed meal by using a grinder, and screening the cottonseed meal by using a 100-mesh screen to obtain ground cottonseed meal. Adding 1000 parts of deionized water, 100 parts of ground cotton cake powder and 10 parts of ammonia water into a reaction kettle, stirring at room temperature for 1 hour, centrifuging at the speed of 3500r/min for 15 minutes, taking supernate, adding 8 parts of hydrochloric acid, stirring for 20 minutes, and centrifuging at the speed of 3500r/min for 15 minutes to obtain the centrifuged cotton cake. Adding 200 parts of deionized water, 20 parts of castor oil modified polyol and 35 parts of urea into a reaction kettle, heating to 60-70 ℃, adding cottonseed protein curd, stirring to completely dissolve the cottonseed protein curd, adding 10 parts of gelatin powder, and stirring and dissolving to obtain the main agent. When the adhesive is used, 30 parts of blocked polymethylene polyphenyl isocyanate and 10 parts of wood powder are added into a main agent and uniformly mixed to obtain the composite adhesive. The performance index of the adhesive is shown in table 1.
Verification example:
the three-layer plywood is pressed by the composite adhesives prepared in the above examples 1-3, the thickness of the poplar veneer is 1.6-1.7mm, the breadth is 300 × 300mm, the water content is 10-12%, double-sided gluing is adopted, and the gluing amount is 300g/m2After gluing, closing and aging for 20 minutes, then prepressing for 30 minutes under the pressure of 0.8MPa, and hot-pressing for 7.0 minutes under the pressure of 1.2-1.4MPa at the hot-pressing temperature of 150 ℃.
The three-layer plywood prepared by the method is tested for wet bonding strength according to the requirements of II-type plywood in national standard GB17657-1999 experiment method for physical and chemical properties of artificial boards and decorative artificial boards (a test piece is immersed in hot water at 63 +/-3 ℃ for 3 hours and then cooled at room temperature for 10 minutes). The results of testing the plywood properties of examples 1-3 are shown in Table 2. The result shows that the plywood prepared by the composite adhesive meets the requirements of the type II plywood.
TABLE 1 adhesive Performance index
Reference standard: national standard GB14074-2006 Wood adhesive and resin inspection method thereof
Table 2 plywood bond strength test results
Reference standard: the national standard GB17657-1999 Experimental methods for physical and chemical properties of artificial boards and facing artificial boards.
Claims (3)
1. The formaldehyde-free composite adhesive for the artificial board is characterized by being prepared from the following components in parts by weight:
80-120 parts of cottonseed meal, 800-1200 parts of deionized water, 5-10 parts of ammonia water, 4-8 parts of hydrochloric acid, 10-20 parts of natural modifier, 20-40 parts of urea, 10-30 parts of gelatin powder, 20-30 parts of crosslinking enhancer and 10-15 parts of filler;
the natural modifier is vegetable oil polyalcohol;
the crosslinking reinforcing agent is one or more of toluene diisocyanate, diphenylmethane diisocyanate, isophorone diisocyanate or polymethylene polyphenyl isocyanate blocked by sodium bisulfite or a mixture of sodium bisulfite and ethyl acetoacetate;
the filler is one or more of flour, starch, tapioca flour, diatomite, kaolin, bentonite, talcum powder, wood powder or cellulose powder;
the preparation method of the vegetable oil polyalcohol comprises the following steps: 50-60oC, reacting the vegetable oil with peroxy acid in a solvent for 2-4 hours to generate epoxidized vegetable oil, reacting the epoxidized vegetable oil with alcohol, deionized water and a catalyst for 1-2 hours under boiling, and neutralizing a product with a weak alkaline substance to obtain vegetable oil polyol;
the vegetable oil is one or more of cottonseed oil, soybean oil, rapeseed oil, castor oil, olive oil, sesame oil, safflower oil, linseed oil, rice bran oil or palm oil;
the peroxy acid is one or more of peroxyformic acid, peroxyacetic acid, trichloroperoxyacetic acid or benzyloxy peroxyformic acid;
the solvent is one or more of formic acid, acetic acid or chloroform;
the alcohol is a mixture of methanol and one of isopropanol, chloroform, formic acid or acetic acid, and the proportion of the methanol in each mixture is not higher than 20% by volume;
the catalyst is one of sulfuric acid, phosphoric acid, hydrochloric acid, fluoroboric acid, p-toluenesulfonic acid or acid activated bentonite or montmorillonite;
the weak alkaline substance is one of ammonia water, calcium carbonate, sodium bicarbonate or magnesium carbonate.
2. The adhesive of claim 1, wherein the vegetable oil polyol has a viscosity of 2000-5000mPa · s and a hydroxyl value of 150-220 mgKOH/g.
3. The method for preparing the aldehyde-free composite adhesive for artificial boards according to claim 1, which is characterized by comprising the following steps:
1) drying the oil-extracted cottonseed meal, grinding the cottonseed meal by using a grinder, and screening the cottonseed meal by using a 100-mesh screen to obtain ground cottonseed meal;
2) adding deionized water, ground cotton meal powder and ammonia water into a reaction kettle, stirring for 1 hour, centrifuging at 3500r/min for 15 minutes, taking supernate, adding hydrochloric acid, stirring for 20 minutes, and centrifuging at 3500r/min for 15 minutes to obtain cotton seed protein curd;
3) adding deionized water, a natural modifier and urea into a reaction kettle, heating to 60-70 ℃, adding the cottonseed protein curd, stirring to completely dissolve the cottonseed protein curd, adding gelatin powder, and stirring to dissolve to obtain a main agent;
4) when in use, the main agent, the crosslinking reinforcing agent and the filler are uniformly mixed to prepare the formaldehyde-free composite adhesive.
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| CN112920771B (en) * | 2021-01-28 | 2022-03-25 | 山东农业大学 | Self-crosslinking cottonseed protein adhesive and preparation method thereof |
| CN114012857A (en) * | 2021-10-15 | 2022-02-08 | 廊坊民丰木业有限公司 | Preparation method of high-performance magnesium-based inorganic flame-retardant shaving board |
| CN114350313B (en) * | 2022-01-10 | 2022-09-23 | 南京林业大学 | Cottonseed protein-glycosyl environment-friendly adhesive as well as preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US2662023A (en) * | 1951-05-18 | 1953-12-08 | Jr Jett C Arthur | Cottonseed meal glue |
| DE10108025A1 (en) * | 2001-02-19 | 2002-09-05 | Henkel Kgaa | Two-component polyurethane adhesive for wood materials |
| CN100494299C (en) * | 2006-07-10 | 2009-06-03 | 武汉理工大学 | Natural macromolecular composite aqueous polyurethane bond and its preparation method |
| CN101475790B (en) * | 2008-01-04 | 2012-10-10 | 杨光 | Novel timber adhesive and preparation thereof |
| CA2753866C (en) * | 2009-03-06 | 2020-04-28 | Biopolymer Technologies, Ltd. | Protein-containing emulsions and adhesives, and manufacture and use thereof |
| CN101649178B (en) * | 2009-08-17 | 2011-12-07 | 北京林业大学 | Vegetable protein adhesive, preparation method and modified adhesive prepared therefrom |
| CN101928546B (en) * | 2010-03-15 | 2012-10-03 | 田志壮 | Formaldehyde-free wood adhesive and preparation method thereof |
| CN104946196B (en) * | 2015-06-12 | 2017-09-22 | 中国农业科学院农产品加工研究所 | Environmentally friendly Cottonseed Meal base adhesive of a kind of cross-linking type and preparation method and application |
| CN105969293B (en) * | 2016-07-01 | 2017-09-05 | 陈肖强 | A kind of double component solvent-free vegetable oil base adhesive |
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