CN110079269B - Oil-tea-cake adhesive and preparation method and application thereof - Google Patents
Oil-tea-cake adhesive and preparation method and application thereof Download PDFInfo
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- CN110079269B CN110079269B CN201910307003.2A CN201910307003A CN110079269B CN 110079269 B CN110079269 B CN 110079269B CN 201910307003 A CN201910307003 A CN 201910307003A CN 110079269 B CN110079269 B CN 110079269B
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- 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
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J189/00—Adhesives based on proteins; Adhesives based on derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a camellia oleifera cake adhesive and a preparation method and application thereof, wherein the camellia oleifera cake adhesive is prepared from the following raw materials in parts by weight: 100 parts of viscosity regulator, 30-60 parts of oil-tea cake powder, 0.5-2 parts of modifier, 8-30 parts of cross-linking agent, 1-8 parts of curing agent, 5-15 parts of diluent and 0.5-8 parts of filler; the modifier comprises at least one of an anionic surfactant, a protein denaturant or a base. The adhesive provided by the scheme of the invention has good application in the manufacturing of artificial boards. Compared with the prior art, the adhesive provided by the invention has the advantages of simple and convenient preparation process, safety, environmental protection and the like.
Description
Technical Field
The invention relates to the field of wood adhesive preparation, in particular to an oil-tea camellia cake adhesive and a preparation method and application thereof.
Background
At present, the traditional "three-aldehyde glue" is the most commonly applied adhesive in the wood industry, has the advantages of simple production process, cheap and easily available raw materials, good bonding strength and the like, is widely applied to the fields of artificial boards and secondary processing of the artificial boards, interior decoration and the like, and the using amount of the three-aldehyde glue accounts for about 80 percent of the total glue consumption in the wood industry. However, the aldehyde resin adhesive used in the market has the serious defects of high free formaldehyde content and the like, formaldehyde can be released in the production and use processes of the plywood, the release period of the formaldehyde reaches 3-15 years, and the formaldehyde cannot be completely volatilized in a short period after decoration, so that the formaldehyde exists in indoor air for a long time, and when the formaldehyde is accumulated to a certain concentration, the formaldehyde can cause serious harm to human health. The characteristics of aldehyde resin determine that free formaldehyde can be released in the processes of plate production and product application, the bonding strength can be reduced while the formaldehyde content in glue is simply reduced, and the product yield is reduced, so that many artificial board production enterprises adopt physical means such as passive formaldehyde masking, adsorption, sealing and the like, but once the conditions of formaldehyde release are met, formaldehyde still volatilizes in a large amount, and the problem of formaldehyde release is not fundamentally solved.
The oil tea cake is used as a byproduct in the oil tea processing industry and mainly contains substances such as protein, polysaccharides, tea saponin, cellulose, tannin and the like. In the traditional process, the camellia oleifera cake is usually used for extracting tea saponin and polysaccharides, but the production process is complex and the cost is high, so that large-scale industrial application is not available at present. The oil tea cake dregs can also be used as organic fertilizer, but because the oil tea cake dregs contain tea saponin which is hemolytic toxin and can melt red blood cells of aquatic animals to generate serious toxicity to fishes, loaches, snails, mussels and the like, detoxification treatment is needed if the oil tea cake dregs are used as the organic fertilizer. The wood adhesive is prepared from the oil-tea camellia cakes, so that the utilization rate of the oil-tea camellia cakes can be effectively improved, and the additional value of the whole oil-tea camellia processing industrial chain can be improved. As an environment-friendly adhesive, the oil-tea cake adhesive has no problem of formaldehyde release in the production and product application stages. Meanwhile, the oil-tea camellia cake meal is used as a renewable resource, and the large-scale application of the oil-tea camellia cake meal has a great promotion effect on reducing the dependency of petrochemical resources and has important practical significance on the development of the wood industry.
In the prior art, part of related technologies for preparing adhesives by using oil-tea camellia cakes exist, but the related technologies have the defects of low utilization rate, complex operation process and the like. For example, chinese patent document CN102295902A discloses a method for producing a protein adhesive from oil-tea camellia meal, and specifically discloses a method for obtaining a protein adhesive from oil-tea camellia meal by extracting protein components from oil-tea camellia meal through chemical treatment and grafting with maleic anhydride. The technical process is complex, only protein components in the oil-tea camellia cake are extracted and utilized to prepare the adhesive, and other components such as tannin, polysaccharide, tea saponin and the like are not fully utilized. The Chinese invention patent document CN102618196A discloses a preparation method of a biomass adhesive, the biomass adhesive and a plywood thereof, and particularly discloses a method for preparing the adhesive by pretreating oil-tea camellia cakes with alkali and then polymerizing the oil-tea camellia cakes with phenol and aldehyde substances. The technology uses aldehydes in the preparation process, and the danger of formaldehyde release still exists in the production and related product application processes.
Based on the above, the preparation raw materials and the process in the prior art still need to be modified, and a raw material and a process for preparing the oil-tea-cake adhesive, which can avoid the problem of formaldehyde release and improve the utilization rate of the oil-tea-cake, are found.
Disclosure of Invention
The first technical problem to be solved by the invention is as follows: the camellia oleifera cake adhesive has higher utilization rate of camellia oleifera cakes.
The second technical problem to be solved by the invention is: the preparation process of the camellia oleifera cake adhesive is simple and convenient to operate.
The third technical problem to be solved by the invention is: provides an application of the adhesive for the oil-tea camellia cake dregs.
In order to solve the first technical problem, the invention adopts the technical scheme that: the camellia oleifera cake adhesive is prepared from the following raw materials in parts by weight: 100 parts of viscosity regulator, 30-60 parts of oil-tea cake powder, 0.5-2 parts of modifier, 8-30 parts of cross-linking agent, 1-8 parts of curing agent, 5-15 parts of diluent and 0.5-8 parts of filler; the modifier is selected from at least one of an anionic surfactant, a protein denaturant or an alkali.
Preferably, the preparation raw material comprises the following components in parts by weight: 100 parts of viscosity regulator, 40-50 parts of oil-tea cake powder, 1-1.5 parts of modifier, 10-20 parts of cross-linking agent, 2-4 parts of curing agent, 10-15 parts of diluent and 3-4 parts of filler; the modifier is selected from at least one of an anionic surfactant, a protein denaturant or an alkali.
Preferably, the anionic surfactant comprises at least one of sodium dodecylbenzene sulfonate or sodium dodecyl sulfonate; the protein denaturant comprises at least one of dithiothreitol or beta-mercaptoethanol and at least one of urea or guanidine hydrochloride; the base comprises at least one of sodium hydroxide or potassium hydroxide.
Preferably, the particle size of the oil-tea camellia cake powder is 80-100 meshes, the content of crude protein in the oil-tea camellia cake powder is 12% -16%, the content of crude fat is 4-6%, the content of crude fiber is 4-8%, the content of tea saponin is 10-14%, the content of tannin is 2-5%, and the contents are mass contents.
Further, the crosslinking agent comprises a diglycidyl ether compound and/or an epoxy resin.
Preferably, the diglycidyl ether compound includes at least one of ethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and bisphenol a diglycidyl ether.
Preferably, the curing agent comprises at least one of diethylenetriamine and triethylenetetramine.
Preferably, the diluent is at least one of glycerol, ethylene glycol and propylene glycol.
Further, the filler comprises at least one of montmorillonite, palygorskite, alumina, kaolin and talcum powder; preferably, the filler particle size is no greater than 100 nm.
Further, the raw materials for preparing the oil-tea camellia cake adhesive also comprise a mildew preventive.
Preferably, the mildew preventive is imidazole, and can also be other mildew preventives.
Preferably, the weight ratio of the mildew preventive to the viscosity regulator is 100 (0.1-1.6).
Preferably, the viscosity modifier is water.
The invention has the beneficial effects that: according to the scheme, the camellia oleifera cake residues of the camellia oleifera processing residues are directly used as the main raw material, a new effective way is provided for full resource utilization of the camellia oleifera cake residues, the overall cost of a camellia oleifera processing industrial chain is reduced, the economic value of camellia oleifera crops is improved, and the healthy and sustainable development of the camellia oleifera processing industry is promoted; the oil tea cake belongs to renewable biomass resources, and the large-scale development and utilization of the oil tea cake is expected to reduce the dependence of wood industry on synthetic resin, reduce the consumption of petrochemical resources and meet the requirements of sustainable development; the modifier can expand and partially degrade the protein structure in the oil-tea camellia cake, expose polar and nonpolar groups in the oil-tea camellia cake, and create conditions for the subsequent crosslinking reaction of the crosslinking agent and the exposed active reaction groups, so that the bonding strength and the water resistance of the adhesive can be improved.
In order to solve the second technical problem, the invention adopts the technical scheme that: the preparation method of the adhesive for the oil-tea camellia cake meal comprises the following steps:
s1, adding a viscosity regulator and a modifier into a container, heating to 40-60 ℃, adding oil-tea cake meal while stirring, keeping the temperature for 1-5 hours after the addition is finished, cooling and discharging to prepare an oil-tea cake meal-based emulsion;
and S2, adding the rest preparation raw materials into the oil tea cake pulp-based latex liquid, mixing and stirring at normal temperature for 30-60 minutes until the mixture is homogeneous, and thus obtaining the oil tea cake.
Further, in the step S1, after the oil tea cake powder is completely added, grinding the oil tea cake powder by using a ball mill, and then performing heat preservation; preferably, the ball mill grinds the materials for 2-5 h; more preferably, the grinding operation is to grind all material to a particle size of no greater than 200 mesh.
The invention has the beneficial effects that: the preparation process of the oil-tea camellia cake adhesive is simple, has strong operability and is suitable for industrial production of various scales; according to the scheme, full resources of the oil-tea camellia cake are utilized, the oil-tea camellia cake is used as a base material, physical separation and modification treatment are carried out on the oil-tea camellia cake, and a cross-linking agent and a curing agent are added to endow the oil-tea camellia cake with excellent bonding strength and water resistance; the preparation process has no formaldehyde added, and radically eliminates the problem of formaldehyde release.
In order to solve the third technical problem, the invention adopts the technical scheme that: an application of the oil-tea camellia cake adhesive in the manufacturing of artificial boards.
The invention has the beneficial effects that: the oil-tea cake adhesive of the scheme of the invention has excellent bonding strength and water resistance, meets the requirements of II-type plywood, and can be used for producing artificial boards such as core-board boards, impregnated adhesive film veneer artificial boards and the like; meanwhile, the oil-tea camellia cake adhesive provided by the scheme of the invention is free of formaldehyde, the formaldehyde emission amount of the oil-tea camellia cake adhesive meets the E0 standard specified by GB/T9846.3-2004 national standard, and the oil-tea camellia cake adhesive is harmless to human bodies and environment and meets the requirements of environmental protection.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description will be given with reference to the embodiments.
The camellia oleifera cake adhesive is prepared from the following raw materials in parts by weight: 100 parts of viscosity regulator, 30-60 parts of oil-tea cake powder, 0.5-2 parts of modifier, 8-30 parts of cross-linking agent, 1-8 parts of curing agent, 5-15 parts of diluent and 0.5-8 parts of filler; the modifier is selected from at least one of an anionic surfactant, a protein denaturant or an alkali.
Preferably, the preparation raw material comprises the following components in parts by weight: 100 parts of viscosity regulator, 40-50 parts of oil-tea cake powder, 1-1.5 parts of modifier, 10-20 parts of cross-linking agent, 2-4 parts of curing agent, 10-15 parts of diluent and 3-4 parts of filler. Preferably, the anionic surfactant comprises sodium dodecylbenzene sulfonate and/or sodium dodecyl sulfonate; the protein denaturant comprises dithiothreitol and/or beta-mercaptoethanol, urea and/or guanidine hydrochloride; the base comprises sodium hydroxide and/or potassium hydroxide.
Preferably, the particle size of the oil-tea camellia cake powder is 80-100 meshes, the content of crude protein in the oil-tea camellia cake powder is 12% -16%, the content of crude fat is 4-6%, the content of crude fiber is 4-8%, the content of tea saponin is 10-14%, the content of tannin is 2-5%, and the contents are mass contents.
Further, the crosslinking agent comprises a diglycidyl ether compound and/or an epoxy resin.
Preferably, the diglycidyl ether compound includes at least one of ethylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether, and bisphenol a diglycidyl ether.
Preferably, the curing agent comprises at least one of diethylenetriamine and triethylenetetramine.
From the above description, the beneficial effects of the present invention are: the curing agent micromolecules adopting the scheme of the invention can not only perform curing reaction with the cross-linking agent molecules in the hot pressing process, but also react with the protein macromolecules and the tea saponin molecules in the oil-tea-cake to accelerate the curing of the adhesive, promote the cross-linking reaction among the protein macromolecules, the tea saponin molecules and the cross-linking agent molecules, and enable the protein macromolecules, the tea saponin molecules and the cross-linking agent molecules to be mutually linked to form a stable three-dimensional network structure, thereby further enhancing the bonding strength and the water resistance of the adhesive.
Preferably, the diluent is at least one of glycerol, ethylene glycol and propylene glycol.
From the above description, the beneficial effects of the present invention are: the solid content and viscosity of the viscose can be enhanced by adding the diluent, so that the gluing strength and the water resistance are further improved.
Further, the filler comprises at least one of montmorillonite, palygorskite, alumina, kaolin and talcum powder; preferably, the filler particle size is no greater than 100 nm.
From the above description, the beneficial effects of the present invention are: the sources of the modifier, the cross-linking agent and the filler are wide, and the manufacturing cost is low; the particle size of the filler is preferably less than 100nm, and the lower the particle size is, the more obvious the bonding strength reinforcing effect on the adhesive is.
Further, the raw materials for preparing the oil-tea camellia cake adhesive also comprise a mildew preventive.
From the above description, the beneficial effects of the present invention are: the raw materials are free from formaldehyde, the problem of formaldehyde release is avoided in the processing and product application processes, the bonding strength is good, the water resistance is high, and the anti-corrosion and anti-mildew functions are realized.
Preferably, the mildew preventive is imidazole, and can also be other mildew preventives.
Preferably, the weight ratio of the mildew preventive to the viscosity regulator is 100 (0.1-1.6).
From the above description, the beneficial effects of the present invention are: by adding the mildew preventive, the adhesive provided by the invention can better achieve a mildew-proof effect, and the storage performance of the product is improved.
Preferably, the viscosity modifier is water.
From the above description, the beneficial effects of the present invention are: the water is used as a viscosity regulator, so that the use of organic matters is reduced, and the adhesive is more environment-friendly.
The preparation method of the oil-tea camellia cake adhesive comprises the following steps:
s1, adding a viscosity regulator and a modifier into a container, heating to 40-60 ℃, adding oil-tea cake meal while stirring, keeping the temperature for 1-5 hours after the addition is finished, cooling and discharging to prepare an oil-tea cake meal-based adhesive emulsion;
and S2, adding the rest preparation raw materials into the oil tea cake pulp-based latex liquid, mixing and stirring at normal temperature for 30-60 minutes until the mixture is homogeneous, and thus obtaining the oil tea cake.
Further, in the step S1, after the oil tea cake powder is completely added, grinding the oil tea cake powder by using a ball mill, and then performing heat preservation; preferably, the ball mill grinds the materials for 2-5 h; more preferably, the grinding operation is to grind all material to a particle size of no greater than 200 mesh.
From the above description, the beneficial effects of the present invention are: after the oil-tea camellia cake and the modifier such as alkali are mixed, the oil-tea camellia cake component is better in degradation and modification effects by a ball mill wet milling method, the particle size of a non-degradable substance is reduced, the particle size is reduced after ball milling, the dispersion effect in a viscosity regulator is better, the adhesion effect of an adhesive is better, and the storage stability of a product is greatly improved.
The embodiment 1 of the invention is a preparation method of an oil-tea camellia cake adhesive, which comprises the following steps:
(1) adding 100 parts of water and 0.5 part of sodium hydroxide into a reaction vessel, raising the temperature to 50 ℃, slowly adding 30 parts of oil-tea-cake powder while rapidly stirring, preserving heat for 1 hour after the addition is finished, cooling and discharging to prepare the oil-tea-cake latex.
(2) And (2) adding 10 parts of ethylene glycol diglycidyl ether, 2 parts of diethylene diamine, 3 parts of alumina, 5 parts of glycerol and 0.6 part of imidazole into the oil-tea camellia cake latex prepared in the step (1), and mixing and stirring at normal temperature (25 ℃) until the mixture is uniformly stirred (about 30 min).
Example 2:
(1) 100 parts of water and 1 part of sodium dodecyl sulfate were added to the reaction vessel, and after the temperature was raised to 50 ℃, 40 parts of oil-tea camellia cake powder was slowly added and rapidly stirred. After the addition is finished, preserving the heat for 1 hour, cooling and discharging to prepare the oil-tea cake pulp latex.
(2) To the oil tea cake pulp latex, 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol, and 1 part of imidazole were added, and mixed under normal temperature conditions until stirred uniformly (about 45 min).
Example 3:
(1) 100 parts of water and 2 parts of potassium hydroxide were added to the reaction vessel, and after the temperature was raised to 50 ℃, 60 parts of oil-tea camellia cake powder was slowly added and rapidly stirred. After the addition is finished, preserving the heat for 1 hour, cooling and discharging to prepare the oil-tea cake pulp latex.
(2) Adding 20 parts of polyethyleneimine epichlorohydrin, 2 parts of triethylenetetramine, 4 parts of alumina, 10 parts of glycerol and 1 part of imidazole into the oil-tea camellia cake latex emulsion, and mixing and stirring at normal temperature until the mixture is uniformly stirred (about 60 min).
Example 4:
(1) 100 parts of water and 1 part of sodium dodecyl sulfate were added to the reaction vessel, and after the temperature was raised to 50 ℃, 40 parts of oil-tea camellia cake powder was slowly added and rapidly stirred. After the addition is finished, grinding the materials by using a ball mill until the particle sizes of all the materials are below 200 meshes, preserving heat for 1 hour, cooling and discharging to prepare the oil-tea cake latex.
(2) To the oil tea cake pulp latex, 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol, and 1 part of imidazole were added, and mixed under normal temperature conditions until stirred uniformly (about 45 min).
Example 5:
(1) 100 parts of water and 1 part of sodium dodecyl sulfate were added to the reaction vessel, and after the temperature was raised to 50 ℃, 40 parts of oil-tea camellia cake powder was slowly added and rapidly stirred. After the addition is finished, grinding the materials by using a ball mill until the particle sizes of all the materials are below 150 meshes, preserving heat for 1 hour, cooling and discharging to prepare the oil-tea cake latex.
(2) To the oil tea cake pulp latex, 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol, and 1 part of imidazole were added, and mixed under normal temperature conditions until stirred uniformly (about 45 min).
Example 6:
(1) 100 parts of water and 1 part of sodium dodecyl sulfate were added to the reaction vessel, and after the temperature was raised to 50 ℃, 50 parts of oil-tea camellia cake powder was slowly added and rapidly stirred. After the addition is finished, grinding the materials by using a ball mill until the particle sizes of all the materials are below 200 meshes, preserving heat for 1 hour, cooling and discharging to prepare the oil-tea cake latex.
(2) To the oil tea cake pulp latex, 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol, and 1 part of imidazole were added, and mixed under normal temperature conditions until stirred uniformly (about 45 min).
Example 7:
(1) 100 parts of water and 1 part of sodium dodecyl sulfate were added to the reaction vessel, and after the temperature was raised to 50 ℃, 50 parts of oil-tea camellia cake powder was slowly added and rapidly stirred. After the addition is finished, preserving the heat for 1 hour, cooling and discharging to prepare the oil-tea cake pulp latex.
(2) To the oil tea cake pulp latex, 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol, and 1 part of imidazole were added, and mixed under normal temperature conditions until stirred uniformly (about 45 min).
Example 8:
(1) 100 parts of water, 1 part of dithiothreitol and 0.5 part of urea are added into a reaction vessel, 50 parts of oil-tea camellia cake meal is slowly added after the temperature is raised to 60 ℃, and the mixture is rapidly stirred. After the addition is finished, preserving the heat for 1 hour, cooling and discharging to prepare the oil-tea cake pulp latex.
(2) To the oil tea cake pulp latex, 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol, and 1 part of imidazole were added, and mixed under normal temperature conditions until stirred uniformly (about 45 min).
Example 9:
(1) 100 parts of water and 0.5 part of urea are added to a reaction vessel, and after the temperature is raised to 60 ℃, 50 parts of oil-tea camellia cake meal is slowly added and rapidly stirred. After the addition is finished, preserving the heat for 1 hour, cooling and discharging to prepare the oil-tea cake pulp latex.
(2) To the oil tea cake pulp latex, 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol, and 1 part of imidazole were added, and mixed under normal temperature conditions until stirred uniformly (about 45 min).
Comparative example 1:
100 parts of water is added into the reaction vessel, 40 parts of oil-tea camellia cake powder is slowly added, and the mixture is rapidly stirred until the mixture is uniform. After the addition, the temperature is kept for 1 hour, the mixture is cooled and discharged to prepare the oil-tea camellia cake latex, and then 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol and 1 part of imidazole are added into the oil-tea camellia cake latex, and the mixture is mixed and stirred at the normal temperature (25 ℃) until the mixture is uniformly stirred (about 45 min).
Comparative example 2:
adding 100 parts of water and 1 part of sodium dodecyl sulfate into a reaction vessel, raising the temperature to 50 ℃, slowly adding 40 parts of oil-tea camellia cake meal, and quickly stirring to be uniform. After the addition is finished, the temperature is kept for 1 hour, the mixture is cooled to room temperature and then discharged, and the oil-tea cake pulp latex is prepared. Then adding 15 parts of polypropylene glycol diglycidyl ether, 4 parts of kaolin, 10 parts of ethylene glycol and 1 part of imidazole into the oil-tea camellia cake latex, and mixing and stirring at normal temperature (25 ℃) until the mixture is uniformly stirred (about 45 min).
Comparative example 3:
adding 100 parts of water and 1 part of sodium dodecyl sulfate into a reaction vessel, raising the temperature to 50 ℃, slowly adding 40 parts of defatted soybean powder, and quickly stirring until the mixture is uniform. After the addition, the mixture was kept warm for 1 hour, cooled to room temperature, and discharged, and then 15 parts of polypropylene glycol diglycidyl ether, 2 parts of diethylenetriamine, 4 parts of kaolin, 10 parts of ethylene glycol, and 1 part of imidazole were added, and the mixture was mixed and stirred at room temperature (25 ℃) until the mixture was uniformly stirred (about 45 minutes), thereby obtaining a soybean-based adhesive.
Application effect test:
three-ply plywood was pressed with the adhesives prepared in examples 1-9 and comparative examples 1-3, respectively, using the following process parameters:
veneer: eucalyptus, the thickness is 1.8 mm, and the water content is 6% -8%;
sizing amount: 450g/m2(double-sided);
aging time: 10-15 minutes;
the prepressing process comprises the following steps: the prepressing pressure is 1.0MPa, and the prepressing time is 30 minutes;
a hot pressing process: the hot pressing pressure is 1.2MPa, the hot pressing time is 9 minutes, and the hot pressing temperature is 110 ℃.
The three-layer plywood is prepared according to the process, and the dry-state and wet-state bonding strength of the plywood is tested according to GB/T17657 and 2013, namely Experimental method for physical and chemical properties of artificial boards and decorative artificial boards. The wet bonding strength is measured by immersing the test piece at 63 ℃ for 3 hours, taking out the test piece, and cooling the test piece for 10 minutes at room temperature.
The dry-bond strength and the wet-bond strength in the inventive examples and comparative examples were tested under the above-described conditions. The results of the performance tests of experimental examples 1 to 9 and comparative examples 1 to 3 are shown in table 1:
TABLE 1 bonding strength test results for oil-tea camellia cake adhesive
As can be seen from the above table, the three-layer plywood prepared by using the oil-tea camellia cake adhesive provided by the embodiment of the invention has good adhesive effect, and the dry-state bonding strength and the wet-state bonding strength of the three-layer plywood exceed 0.70MPa, so that the requirements of type II plywood are met. Meanwhile, the plywood manufactured by the scheme of the embodiment of the invention does not release formaldehyde in the storage process.
In conclusion, the adhesive provided by the scheme of the invention has the advantages of wide raw material source, low price, simple preparation process, strong controllability, easiness in industrial production on various scales, no formaldehyde addition in raw materials, no formaldehyde release problem in the processing and product application processes, good bonding strength, strong water resistance, and corrosion and mildew resistance.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention in the specification or directly or indirectly applied to the related technical field are included in the scope of the present invention.
Claims (5)
1. A preparation method of an adhesive for oil-tea camellia cake dregs is characterized by comprising the following steps: the method comprises the following steps:
s1, adding a viscosity regulator and a modifier into a container, heating to 40-60 ℃, adding oil-tea cake meal while stirring, keeping the temperature for 1-5 hours after the addition is finished, cooling and discharging to prepare an oil-tea cake meal-based emulsion;
s2, adding the rest preparation raw materials into the oil tea cake based latex liquid, mixing and stirring at normal temperature for 30-60 minutes until the mixture is homogeneous, and thus obtaining the oil tea cake;
in the step S1, after the oil tea cake powder is added, grinding the oil tea cake powder by using a ball mill, and then performing heat preservation;
the raw materials for preparing the oil-tea camellia cake adhesive comprise the following components in parts by weight: 100 parts of viscosity regulator, 30-60 parts of oil-tea cake powder, 0.5-2 parts of modifier, 8-30 parts of cross-linking agent, 1-8 parts of curing agent, 5-15 parts of diluent and 0.5-8 parts of filler; the modifier is selected from at least one of an anionic surfactant, a protein denaturant or an alkali;
the diluent is at least one of glycerol, ethylene glycol and propylene glycol; the filler comprises at least one of montmorillonite, palygorskite, alumina, kaolin and talcum powder;
the cross-linking agent comprises a diglycidyl ether compound, and the diglycidyl ether compound is polypropylene glycol diglycidyl ether;
the anionic surfactant comprises at least one of sodium dodecyl benzene sulfonate or sodium dodecyl sulfonate;
the protein denaturant comprises at least one of dithiothreitol or beta-mercaptoethanol and at least one of urea or guanidine hydrochloride;
the base comprises at least one of sodium hydroxide or potassium hydroxide;
the particle size of the oil tea cake powder is 80-100 meshes, the content of crude protein in the oil tea cake powder is 12% -16%, the content of crude fat is 4-6%, the content of crude fiber is 4-8%, the content of tea saponin is 10-14%, the content of tannin is 2-5%, and the contents are mass contents;
the curing agent comprises at least one of diethylenetriamine and triethylenetetramine.
2. The preparation method of the oil-tea camellia cake adhesive according to claim 1, which is characterized by comprising the following steps: the crosslinking agent also includes an epoxy resin.
3. The preparation method of the oil-tea camellia cake adhesive according to claim 1, which is characterized by comprising the following steps: the filler particle size is not more than 100 nm.
4. The preparation method of the oil-tea camellia cake adhesive according to claim 1, which is characterized by comprising the following steps: the raw materials for preparing the oil-tea camellia cake adhesive also comprise a mildew preventive.
5. The preparation method of the oil-tea camellia cake adhesive according to claim 1, which is characterized by comprising the following steps: and the ball mill grinds the materials for 2-5 h.
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| CN110499141A (en) * | 2019-08-29 | 2019-11-26 | 贵州大学 | A kind of biomass crosslinking agent modified oil tea oil cake adhesive and preparation method and application |
| CN114539346B (en) * | 2020-11-25 | 2024-03-19 | 贵州大学 | Method for extracting oil tea cake protein and application of oil tea cake protein |
| CN114752348A (en) * | 2022-04-28 | 2022-07-15 | 北京林业大学 | ultralow-VOC (volatile organic compound) plant protein adhesive for I-type plywood and preparation method thereof |
| CN115179385A (en) * | 2022-06-23 | 2022-10-14 | 北京林业大学 | Preparation method of aldehyde-free artificial board for oil tea fruit shell base room |
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