CN114750479B - High-heat-resistance anti-deformation cooling fan for electric tool and production process of high-heat-resistance anti-deformation cooling fan - Google Patents
High-heat-resistance anti-deformation cooling fan for electric tool and production process of high-heat-resistance anti-deformation cooling fan Download PDFInfo
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- CN114750479B CN114750479B CN202210461782.3A CN202210461782A CN114750479B CN 114750479 B CN114750479 B CN 114750479B CN 202210461782 A CN202210461782 A CN 202210461782A CN 114750479 B CN114750479 B CN 114750479B
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Classifications
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
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- C09D7/65—Additives macromolecular
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- C—CHEMISTRY; METALLURGY
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- 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
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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
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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
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- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
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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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
- C09J4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00
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- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
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Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Adhesives Or Adhesive Processes (AREA)
Abstract
The application relates to the technical field of cooling equipment manufacturing, and particularly discloses a high-heat-resistance anti-deformation cooling fan for an electric tool and a production process of the cooling fan. The fan comprises a composite blade, the composite blade comprises a substrate and a heat-resistant polymer plate, the heat-resistant polymer plate is bonded with the substrate through a bonding agent layer, the bonding agent layer is a cured product of a bonding agent under a baking condition, the bonding agent comprises a component A and a component B, and the component A comprises the following components in parts by weight: 8-12 parts of amine curing agent, 20-40 parts of diluent, 4-8 parts of toughening agent and 8-10 parts of foaming agent; the component B comprises the following components in parts by weight: 40-60 parts of epoxy resin, 20-40 parts of diluent, 6-10 parts of foam stabilizer, wherein the foam stabilizer is modified lignin, and the modified lignin is lignin with isocyanate groups grafted in molecules. The foaming agent and the foam stabilizer take effect in a synergistic manner, so that the heating rate of the binder layer in a high-temperature environment is slowed down, and the working time of the composite blade in the high-temperature environment is prolonged.
Description
Technical Field
The application relates to the technical field of cooling equipment manufacturing, in particular to a high-heat-resistance anti-deformation electric tool cooling fan and a production process thereof.
Background
At present, in various electric tools, heat dissipation performance has a great influence on the normal operation of the tools. If the heat dissipation performance of the electric tool is poor, when the electric tool works in a high-temperature environment (such as a fire scene), heat is easily accumulated in the electric tool, so that the temperature of the electric tool is increased, the use of an operator on the electric tool is influenced, and a circuit of the electric tool is possibly burnt. In order to cool down the power tool more effectively, manufacturers usually install a cooling fan in the power tool when manufacturing the power tool. The blades of the cooling fan are usually made of engineering plastics (such as polyphenylene sulfone resin) with good heat resistance and metal base plates with good deformation resistance, so as to adapt to the condition that the cooling fan needs to be continuously operated for a long time in a high-temperature environment.
In the related art, there is an anti-deformation electric tool cooling fan, which includes a composite blade and a fan frame, wherein the composite blade includes a metal substrate and a heat-resistant polymer plate, the metal substrate is made of FV520B fan steel, and the heat-resistant polymer plate is made of polyphenylene sulfone resin. The metal substrate and the heat-resistant polymer plate are bonded through a bonding agent layer, the bonding agent layer is a cured product of a bonding agent, the bonding agent comprises a component A and a component B, and the component A comprises the following components in parts by weight: 10 parts of amine curing agent, 30 parts of diluent and 6 parts of toughening agent; the component B comprises the following components in parts by weight: 50 parts of epoxy resin and 30 parts of diluent.
In view of the above-described related art, the inventors believe that, although the bonding of the metal substrate and the heat-resistant polymer sheet is achieved by the adhesive layer in the related art, and the composite blade is obtained, the main component of the adhesive layer is an epoxy resin, and the glass transition temperature of the epoxy resin is lower than that of the polyphenylene sulfone resin. When the ambient temperature around the composite blade is higher than the glass transition temperature of the epoxy resin for a long time, the adhesive property of the adhesive layer is reduced, which easily causes the separation of the metal substrate and the heat-resistant polymer plate, and affects the normal use of the cooling fan.
Disclosure of Invention
In the related art, when the ambient temperature around the composite blade is higher than the glass transition temperature of the epoxy resin for a long time, the metal substrate and the heat-resistant polymer plate are easily separated, affecting the normal use of the cooling fan. To improve this drawback, the present application provides a high heat-resistant deformation-resistant electric tool cooling fan and a process for producing the same.
In a first aspect, the present application provides a high heat-resistant and deformation-resistant cooling fan for an electric power tool, which adopts the following technical solution:
a high heat and deformation resistant electric tool cooling fan, the fan comprising a composite blade, the composite blade comprising a substrate and a heat resistant polymer sheet, the heat resistant polymer sheet being bonded to the substrate by a binder layer, the binder layer being a cured product of a binder under bake conditions, the binder comprising an A-component and a B-component, the A-component comprising the following components in parts by weight: 4-8 parts of amine curing agent, 20-40 parts of diluent, 4-8 parts of toughening agent and 8-10 parts of foaming agent; the component B comprises the following components in parts by weight: 40-60 parts of epoxy resin, 20-40 parts of diluent and 6-10 parts of foam stabilizer, wherein the foam stabilizer is modified lignin, and the modified lignin is lignin with isocyanate groups grafted in molecules.
Through adopting above-mentioned technical scheme, this application has added the foamer in the A component of binder, has added the foam stabilizer in the B component of binder, under the combined action of foamer and foam stabilizer, can form pore structure in the binder layer, and pore structure can reduce the coefficient of heat conductivity on binder layer to the transmission of heat in the binder layer has been restricted, has slowed down the rate of rise of binder layer in high temperature environment, helps improving the heat resistance of binder layer and composite blade.
The foam stabilizer plays a foam stabilizing role through the modified lignin, and in the curing process of the binder, the modified lignin is crosslinked with an epoxy group in the epoxy resin through an isocyanate group in a molecule, so that on one hand, the viscosity of the binder is increased, the diffusion of gas in the binder is limited, and a foam stabilizing effect is achieved; on the other hand, the modified lignin also increases the number of hydrogen bonds in the binder layer, and the hydrogen bonds need to absorb heat when damaged by heating, so that the heating rate of the binder layer in a high-temperature environment is slowed down, the heat resistance of the binder layer and the composite blade is improved, and the possibility of separation of the metal substrate and the heat-resistant polymer plate is reduced. In addition, a large number of benzene rings are introduced into the adhesive by the modified lignin, so that the rigidity of the adhesive layer is improved, and the resistance of the composite blade to deformation is improved.
Preferably, the component A comprises the following components in parts by weight: 5-7 parts of amine curing agent, 25-35 parts of diluent, 5-7 parts of toughening agent and 2.5-3.5 parts of foaming agent, wherein the component B comprises the following components in parts by weight: 45-55 parts of epoxy resin, 25-35 parts of diluent and 7-9 parts of foam stabilizer.
By adopting the technical scheme, the raw material ratio of the component A and the component B is optimized, the effect of a foaming agent and a foam stabilizer for manufacturing a pore structure is improved, the heating rate of the adhesive layer in a high-temperature environment is slowed down, and the heat resistance of the adhesive layer and the composite blade is improved.
Preferably, the component of the toughening agent comprises acrylic acid, and the component of the foaming agent comprises azobisisobutyronitrile.
By adopting the technical scheme, the azodiisobutyronitrile can be spontaneously decomposed to generate free radicals and nitrogen, wherein the nitrogen has a pore-forming effect; the free radicals generated by the decomposition of azobisisobutyronitrile can promote the polymerization of acrylic acid to obtain polyacrylic acid, and the polymerization of acrylic acid is a strong exothermic reaction, which is helpful for accelerating the curing of the adhesive layer. In addition, because the carboxyl is introduced into the adhesive layer by the acrylic acid, the nitrile group is introduced into the adhesive layer by the azobisisobutyronitrile, and the carboxyl and the nitrile group are easy to form hydrogen bonds, so that the number of the hydrogen bonds in the adhesive layer is increased, and the improvement of the heat resistance of the adhesive layer and the composite blade is facilitated.
Preferably, the components of the foaming agent further comprise dihydrate gypsum crystals.
By adopting the technical scheme, the dihydrate gypsum in the foaming agent can release moisture in the baking process, and the water can react with the isocyanate group in the modified lignin molecule, so that gas can be generated during the reaction, and a polyurea group can be generated. The polyurea group can improve the strength of the hole wall of the bubble hole, thereby reducing the loss of bubbles in the curing process of the adhesive and being beneficial to improving the heat resistance of the adhesive layer and the composite blade. Meanwhile, the dehydration product of the dihydrate gypsum can also be used as a drying agent, and the moisture permeating into the adhesive layer can be fixed in the operation process of the composite blade, so that the possibility of moisture absorption and deformation of the adhesive layer is reduced.
Preferably, the modified lignin is prepared according to the following method:
(1) Dissolving hydrogen peroxide in deionized water to obtain depolymerization liquid; mixing lignin and depolymerized liquid, and heating and boiling for a period of time to obtain depolymerized lignin dispersion liquid;
(2) Uniformly mixing the depolymerized lignin dispersion liquid and a silane coupling agent, and standing for a period of time to obtain a lignin modified liquid; in the step, the molecule of the silane coupling agent has epoxy group;
(3) And (3) carrying out vacuum drying on the lignin modified liquid, putting the dried product and diisocyanate into dimethylbenzene, heating under the water bath heating condition, stirring for a period of time, and carrying out vacuum drying to remove the dimethylbenzene to obtain the modified lignin.
Through adopting above-mentioned technical scheme, this application is leached lignin through hydrogen peroxide, and hydrogen peroxide can weaken the chemical bond and the intramolecular hydrogen bond in the lignin, has promoted the dissociation of lignin. After lignin is dissociated, the silane coupling agent and the lignin are condensed, epoxy groups are introduced into the lignin, and the lignin with the epoxy groups reacts with diisocyanate to obtain the lignin with isocyanate groups, namely the modified lignin.
Preferably, the modified lignin is prepared according to the following method:
(1) Dissolving sodium hydroxide and hydrogen peroxide in deionized water to obtain depolymerization liquid; mixing lignin and depolymerized liquid, standing for a period of time, and introducing sulfur dioxide gas into the mixed liquid until the mixed liquid is neutral to obtain depolymerized lignin dispersion liquid;
(2) Uniformly mixing the depolymerized lignin dispersion liquid and a silane coupling agent, and standing for a period of time to obtain a lignin modified liquid; in the step, the molecule of the silane coupling agent has epoxy group;
(3) And (3) carrying out vacuum drying on the lignin modified liquid, putting the dried product and diisocyanate into dimethylbenzene, heating under the water bath heating condition, stirring for a period of time, and carrying out vacuum drying to remove the dimethylbenzene to obtain the modified lignin.
By adopting the technical scheme, sodium hydroxide is added in the hydrogen peroxide solution, and the dissociation effect of the hydrogen peroxide on the lignin is better in an alkaline environment; this application still neutralizes remaining sodium hydroxide through sulfur dioxide, and remaining hydrogen peroxide can also be consumed to the sulfur dioxide simultaneously. After the sodium hydroxide is completely neutralized by the sulfur dioxide, the residual sulfite in the mixed liquid can promote the dissolution of the lignin, thereby improving the grafting effect of the silane coupling agent on the lignin, increasing the content of isocyanate groups in the modified lignin and being beneficial to improving the heat resistance of the adhesive layer and the composite blade.
Preferably, the formula of the modified lignin comprises the following raw materials in parts by weight: 30-50 parts of lignin, 4-8 parts of sodium hydroxide, 16-24 parts of hydrogen peroxide, 8-10 parts of a silane coupling agent and 12-16 parts of diisocyanate.
By adopting the technical scheme, the proportion of partial raw materials required by preparing the modified lignin is optimized, and the heat resistance of the binder layer and the heat resistance of the composite blade are improved.
Preferably, the substrate is a metal substrate or a coated metal substrate, and the coated metal substrate is a metal substrate with a porous film layer attached to the surface.
By adopting the technical scheme, the metal substrate has better deformation resistance, the film-coated metal substrate inherits the deformation resistance of the metal substrate, and the porous film layer on the surface of the film-coated metal substrate can contain a part of gas generated by the foaming agent, so that the formation of bubbles is promoted. Meanwhile, compared with a metal substrate with a smooth surface, the porous film layer on the surface of the film-coated metal substrate increases the attachment area of the adhesive, so that the adhesive effect of the adhesive is improved, and the possibility of disintegration of the composite blade is reduced.
Preferably, the coated metal substrate is prepared by the following method:
(1) Uniformly mixing silica sol, silicon rubber powder and starch to obtain a coating solution;
(2) And coating the coating liquid on the surface of the metal substrate, then carrying out vacuum quenching on the metal substrate, and cooling the metal substrate to obtain the film-coated metal substrate.
By adopting the technical scheme, the mixture of the starch and the silica sol is used as a carrier, the silica rubber powder is adhered to the surface of the metal substrate, then the organic chain segment in the silica rubber powder is carbonized through vacuum quenching, and simultaneously the silica sol is subjected to dehydration condensation, the starch is also carbonized, finally a composite of a carbonized product and a ceramic structure is obtained on the surface of the metal substrate, namely the porous film layer, and the preparation of the film-coated metal plate is completed.
In a second aspect, the present application provides a manufacturing process of a cooling fan for a high heat and deformation resistant electric tool, which adopts the following technical solution.
A production process of a high-heat-resistance and deformation-resistance cooling fan of an electric tool comprises the following steps:
(1) Uniformly mixing the component A and the component B of the binder to obtain the binder, and then coating the binder on the surface of the substrate;
(2) Attaching the heat-resistant polymer plate to the adhesive layer, and then baking the substrate and the heat-resistant polymer plate until the adhesive is completely cured to form the adhesive layer, so as to obtain the composite blade;
(3) And connecting a plurality of composite blades to the fan framework to obtain the high-heat-resistance and deformation-resistance cooling fan for the electric tool.
By adopting the technical scheme, after the component A and the component B are mixed, the adhesive force is generated through the curing reaction of the epoxy resin, the bonding of the substrate and the polymer composite board is realized, the composite blades are obtained, then the composite blades are assembled into a whole, and the high-heat-resistance and deformation-resistance electric tool cooling fan is obtained. The application discloses high heat-resisting resistance to deformation electric tool cooling fan is during operation under high temperature environment, and the intraformational pore structure of binder has hindered thermal transmission, has reduced the intensification rate on binder layer, has prolonged the operating duration of composite blade under high temperature environment.
In summary, the present application has the following beneficial effects:
1. in the bonding of this application, the foamer produces the bubble, foam stabilizer makes the bubble temperature, thereby pore structure has been formed in the binder layer, pore structure has hindered the transmission of heat in the binder layer, modification lignin as foam stabilizer has still increased the hydrogen bond quantity in the binder layer simultaneously, and the hydrogen bond needs the heat absorption when being heated and destroyed, the two has slowed down the intensification rate of binder layer in high temperature environment yesterday jointly, the working duration of composite blade under high temperature environment has been prolonged. In addition, benzene rings introduced into the adhesive layer by the modified lignin can improve the rigidity of the adhesive layer, and the composite blade is favorable for improving the resistance of the composite blade to deformation.
2. In the present application, it is preferred that the lignin is dissociated by a mixed solution of hydrogen peroxide and sodium hydroxide, and then the remaining sodium hydroxide and hydrogen peroxide are consumed by using sulfur dioxide. When the sulfur dioxide neutralizes the mixed solution to be neutral, the sulfite in the mixed solution can promote the dissolution of lignin, improve the grafting effect of the silane coupling agent on the lignin, increase the content of isocyanate groups in the modified lignin and contribute to improving the heat resistance of the adhesive layer and the composite blade.
3. According to the method, after the component A and the component B are mixed, the adhesive force is generated through the curing reaction of the epoxy resin, the base plate is bonded with the polymer composite plate, the composite blade is obtained, then the composite blades are assembled into a whole, the high-heat-resistance anti-deformation electric tool cooling fan is obtained, the pore structure in the adhesive layer hinders the heat transfer, and the working time of the composite blade in a high-temperature environment is prolonged.
Detailed Description
The present application will be described in further detail with reference to examples, preparations and comparative examples, and all of the starting materials of the present application are commercially available.
Preparation example of modified Lignin
The following will explain preparation example 1 as an example.
Preparation example 1
In the preparation example, the modified lignin is prepared from 20kg of hydrogen peroxide, 80kg of deionized water, 30kg of lignin, 8kg of silane coupling agent, 12kg of diisocyanate and 60kg of xylene.
In this preparation example, the modified lignin was prepared as follows:
(1) Dissolving 20kg of hydrogen peroxide in 80kg of deionized water to obtain depolymerization liquid; mixing 30kg of lignin with the depolymerized liquid, and heating for 4h under the condition of 80 ℃ water bath to obtain depolymerized lignin dispersion liquid;
(2) Uniformly mixing the depolymerized lignin dispersion liquid and 8kg of silane coupling agent, and standing for 8 hours to obtain lignin modified liquid; in the step, the silane coupling agent is gamma-glycidoxypropyltrimethoxysilane;
(3) Vacuum drying the lignin modified solution, putting the dried product and 12kg of diisocyanate into 60kg of dimethylbenzene, heating and stirring for 2 hours under the condition of 70 ℃ water bath, and then vacuum drying to remove the dimethylbenzene to obtain modified lignin; in this step, the diisocyanate is diphenylmethane diisocyanate.
Preparation example 2
In the preparation example, the formula of the modified lignin comprises the following raw materials of 4kg of sodium hydroxide, 16kg of hydrogen peroxide, 80kg of deionized water, 30kg of lignin, 8kg of silane coupling agent, 12kg of diisocyanate and 60kg of xylene; the amount of sulfur dioxide is based on the amount used for adjusting the pH of the mixed liquid to 7.0.
In this preparation example, the modified lignin was prepared as follows:
(1) Dissolving 4kg of sodium hydroxide and 16kg of hydrogen peroxide in 80kg of deionized water to obtain depolymerization liquid; mixing 30kg of lignin with depolymerized liquid, heating for 4h under the condition of 80 ℃ water bath, and introducing sulfur dioxide gas into the mixed liquid until the mixed liquid is neutral to obtain depolymerized lignin dispersion liquid;
(2) Uniformly mixing the depolymerized lignin dispersion liquid and 8kg of silane coupling agent, and standing for 8 hours to obtain lignin modified liquid; in the step, the silane coupling agent is gamma-glycidoxypropyltrimethoxysilane;
(3) Vacuum drying the lignin modified solution, putting the dried product and 12kg of diisocyanate into 60kg of dimethylbenzene, heating and stirring for 2 hours under the condition of 70 ℃ water bath, and then vacuum drying to remove the dimethylbenzene to obtain modified lignin; in this step, the diisocyanate is diphenylmethane diisocyanate.
As shown in Table 1, preparation examples 2 to 6 were different in the amount of a part of the raw materials in the modified lignin formulations.
TABLE 1
| Sample(s) | Lignin/kg | Sodium hydroxide/kg | Hydrogen peroxide/g | Silane coupling agent/kg | Diisocyanate per kg |
| Preparation example 2 | 30 | 4 | 16 | 8 | 12 |
| Preparation example 3 | 35 | 5 | 18 | 8.5 | 13 |
| Preparation example 4 | 40 | 6 | 20 | 9 | 14 |
| Preparation example 5 | 45 | 7 | 22 | 9.5 | 15 |
| Preparation example 6 | 50 | 8 | 24 | 10 | 16 |
Preparation example of coated Metal substrate
Preparation example 7 is described below as an example.
Preparation example 7
In this production example, the coated metal substrate was produced as follows:
(1) Uniformly mixing 5kg of silica sol containing 75% of water, 3kg of silicon rubber powder and 1kg of starch to obtain a coating solution;
(2) Coating the coating liquid on the surface of a metal substrate, then carrying out vacuum quenching on the metal substrate at 850 ℃, and cooling the metal substrate to obtain a film-coated metal substrate; in this step, the metal substrate is made of FV520B fan steel.
Examples
Examples 1 to 5
The following description will be given by taking example 1 as an example.
Example 1
In this embodiment, the high heat-resistant and deformation-resistant electric tool cooling fan includes a composite blade and a fan frame, the composite blade includes a base plate and a heat-resistant polymer plate, the heat-resistant polymer plate is bonded to the base plate by an adhesive layer, and the adhesive layer is a cured product of an adhesive. The adhesive comprises a component A and a component B, wherein the component A comprises 40kg of amine curing agent, 20kg of diluent, 4kg of toughening agent and 8kg of foaming agent; the component B comprises 40kg of epoxy resin, 20kg of diluent and 6kg of foam stabilizer. Wherein the amine curing agent is triethylene tetramine, the diluent is glycidyl phenyl ether, the toughening agent is silica fume, the foaming agent is sodium bicarbonate, the type of the epoxy resin is epoxy resin E14, and the foam stabilizer is the modified lignin of preparation example 1; the base plate is a metal base plate, the material of the metal base plate is FV520B fan steel, and the material of the heat-resistant polymer plate is polyphenylene sulfone resin.
In the present embodiment, the high heat-resistant deformation-resistant electric tool cooling fan is produced by the following steps:
(1) And (3) mixing the component A and the component B of the binder according to the ratio of 1:1 to obtain a binder, and then spraying the binder on the surface of the substrate;
(2) The heat-resistant polymer plate is attached to the adhesive layer, then the substrate and the heat-resistant polymer plate are jointly baked at 350 ℃, and the substrate and the heat-resistant polymer plate are cooled after being baked for 15min to obtain the composite blade;
(3) And connecting the 6 composite blades to the fan framework through bolts, and then welding and fixing the joints of the bolts to obtain the high-heat-resistance and deformation-resistance cooling fan for the electric tool.
As shown in Table 2, examples 1 to 5 differ mainly in the raw material ratio of the binder
TABLE 2
Example 6
This example differs from example 3 in that the toughening agent is acrylic acid.
Example 7
This example differs from example 6 in that the blowing agents are azodiisobutyronitrile and sodium bicarbonate in a ratio of 2:3, and mixing the obtained mixture.
Example 8
This example differs from example 7 in that the foaming agent is a mixture of dihydrate gypsum powder, azobisisobutyronitrile and sodium bicarbonate in a weight ratio of 1.
Examples 9 to 13
As shown in Table 3, examples 9 to 13 are different from example 8 in the preparation of modified lignin.
TABLE 3
| Sample(s) | Example 8 | Example 9 | Example 10 | Example 11 | Example 12 | Example 13 |
| Preparation example of modified Lignin | Preparation example 1 | Preparation example 2 | Preparation example 3 | Preparation example 4 | Preparation example 5 | Preparation example 6 |
Example 14
This example is different from example 11 in that the substrate was the film-coated metal substrate of preparation example 7.
Comparative example
Comparative example 1
A deformation-resistant electric tool cooling fan comprises a composite blade, wherein the composite blade comprises a metal substrate and a heat-resistant polymer plate, the metal substrate and the heat-resistant polymer plate are bonded through a bonding agent layer, and the bonding agent layer is a cured product of a bonding agent. The adhesive comprises a component A and a component B, wherein the component A comprises the following components in parts by weight: 10kg of amine curing agent, 30kg of diluent and 6kg of toughening agent; the component B comprises the following components in weight kg: 50kg of epoxy resin and 30kg of diluent. The curing agent is triethylene tetramine, the diluent is glycidyl phenyl ether, the toughening agent is silica fume, the type of the epoxy resin is epoxy resin E14, the substrate is a metal substrate, the metal substrate is FV520B fan steel, and the heat-resistant polymer plate is polyphenylene sulfone resin.
The deformation-resistant electric tool cooling fan is produced as follows:
(1) And (3) mixing the component A and the component B of the binder according to the ratio of 1:1 to obtain a binder, and then spraying the binder on the surface of the substrate;
(2) The heat-resistant polymer plate is attached to the adhesive layer, then the substrate and the heat-resistant polymer plate are jointly baked at 350 ℃, and after being baked for 15min, the substrate and the heat-resistant polymer plate are cooled to obtain the composite blade;
(3) And connecting the 6 composite blades to the fan framework through bolts, and then welding and fixing the joints of the bolts to obtain the high-heat-resistance and deformation-resistance cooling fan for the electric tool.
Comparative example 2
This comparative example differs from example 3 in that the foam stabilizer is not included in the a component of the binder.
Comparative example 3
This comparative example differs from example 3 in that lignin is used as the foam stabilizer in the A-component of the binder.
The performance detection test method comprises the following test steps: the cooling fans of the examples and comparative examples were coaxially connected to a rotating shaft, and the cooling fans were placed in a constant temperature environment of 150 ℃, and then the rotating shaft was driven by a motor to rotate at a rotation speed of 3000r/min, and the time for the heat-resistant polymer sheet on the surface of the composite blade of the cooling fan to fall off was measured and recorded as the failure time, and the statistical results of the failure time are shown in table 4.
TABLE 4
Combining examples 1-5 with comparative example 1 and combining Table 4, it can be seen that the failure times measured for examples 1-5 are all longer than for comparative example 1, indicating that the present application is increased by the adjustment and modification of the binder components; the foaming agent and the foam stabilizer increase the viscosity of the adhesive, limit the diffusion of gas in the adhesive while foaming, and promote the generation and curing of a pore structure. Meanwhile, hydrogen bonds are introduced into the adhesive layer, and the hydrogen bonds can hinder the temperature of the adhesive layer from rising. The heat-resistant effect of the binder is improved under the combined action of the pore structure and the hydrogen bond, thereby reducing the possibility that the substrate and the heat-resistant polymer sheet are separated from each other in a high-temperature environment.
Combining example 3 with comparative examples 2-3 and table 4, it can be seen that the failure time measured in example 3 is longer than that measured in comparative examples 2-3, which indicates that the application increases the viscosity of the binder, limits the diffusion of gas in the binder and plays a foam stabilizing effect by dissociating lignin and grafting isocyanate groups in lignin molecules, and crosslinking the isocyanate groups with epoxy groups in epoxy resin; on the other hand, the number of hydrogen bonds in the adhesive layer is increased, the heating rate of the adhesive layer in a high-temperature environment is slowed down, and the possibility of separation of the substrate and the heat-resistant polymer plate in the high-temperature environment is reduced.
It can be seen by combining examples 3 and 6 and table 4 that the failure time measured in example 6 is longer than that in example 3, which indicates that when acrylic acid is selected as the toughening agent, the acrylic acid promotes the ring opening of the epoxy group, which is beneficial to the crosslinking between the epoxy resin and the modified lignin, thereby improving the heat resistance of the adhesive layer and reducing the possibility of mutual separation of the substrate and the heat-resistant polymer plate in a high-temperature environment.
Combining example 7 and example 6 and table 4, it can be seen that the failure time measured in example 7 is longer than that in example 6, which shows that when a mixture of azobisisobutyronitrile and sodium bicarbonate is used as a blowing agent, azobisisobutyronitrile not only generates nitrogen gas to form pores, but also promotes the curing of the binder by promoting the polymerization of acrylic acid, thereby improving the preservation effect of the pores. Meanwhile, carboxyl and nitrile groups are introduced into the adhesive layer, the foaming agent increases the number of hydrogen bonds in the adhesive layer, improves the heat resistance of the adhesive layer, and reduces the possibility of mutual separation of the substrate and the heat-resistant polymer plate in a high-temperature environment.
It can be seen from the combination of example 8 and example 7 and table 4 that the failure time measured in example 8 is longer than that of example 7, which illustrates that when a mixture of dihydrate gypsum powder, azobisisobutyronitrile and sodium bicarbonate is used as a foaming agent, the moisture released by dihydrate gypsum reacts with isocyanate groups in modified lignin molecules, polyurea groups are generated while gas is generated, the strength of the cell walls of the cell pores is improved, the heat resistance of the adhesive layer is improved, and the possibility that the substrate and the heat-resistant polymer plate are separated from each other in a high-temperature environment is reduced.
It can be seen from the combination of example 8, examples 9-13 and table 4 that the failure times measured in examples 9-13 are all longer than those in example 8, which indicates that hydrogen peroxide weakens hydrogen bonds in lignin in the presence of hydrogen peroxide, sodium hydroxide and sulfur dioxide, sodium hydroxide improves the accelerating effect of hydrogen peroxide on lignin dissociation, sulfur dioxide consumes hydrogen peroxide and sodium hydroxide and simultaneously generates a part of sulfite, and sulfite solubilizes and modifies lignin, thereby facilitating the grafting treatment of lignin, making the prepared modified lignin more conducive to improving the heat resistance of the binder layer, and reducing the possibility that the substrate and the heat-resistant polymer plate are separated from each other in a high-temperature environment.
As can be seen by combining example 11, example 14 and table 4, the failure time measured in example 14 is longer than that in example 11, which shows that the porous film layer on the surface of the film-coated metal substrate increases the adhesion area of the adhesive, thereby improving the adhesive effect of the adhesive, and therefore, the porous film layer is more favorable for improving the heat resistance of the adhesive layer compared with the metal substrate which is not subjected to the film coating treatment, and the possibility that the substrate and the heat-resistant polymer plate are separated from each other in a high-temperature environment is reduced.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (7)
1. The cooling fan of the high heat-resistant and deformation-resistant electric tool is characterized by comprising a composite blade, wherein the composite blade comprises a substrate and a heat-resistant polymer plate, the heat-resistant polymer plate is bonded with the substrate through an adhesive layer, the adhesive layer is a cured product of an adhesive under baking conditions, the adhesive comprises an A component and a B component, and the A component comprises the following components in parts by weight: 4-8 parts of amine curing agent, 20-40 parts of diluent, 4-8 parts of toughening agent and 8-10 parts of foaming agent; the component B comprises the following components in parts by weight: 40-60 parts of epoxy resin, 20-40 parts of diluent and 6-10 parts of foam stabilizer, wherein the foam stabilizer is modified lignin, and the modified lignin is lignin of which the molecules are grafted with isocyanate groups;
the modified lignin is prepared according to one of the first method and the second method, and in the second method, the formula of the modified lignin comprises the following raw materials in parts by weight: 30-50 parts of lignin, 4-8 parts of sodium hydroxide, 16-24 parts of hydrogen peroxide, 8-10 parts of a silane coupling agent and 12-16 parts of diisocyanate;
the method comprises the following steps:
(1) Dissolving hydrogen peroxide in deionized water to obtain depolymerization liquid; mixing lignin and depolymerized liquid, and heating and boiling for a period of time to obtain depolymerized lignin dispersion liquid;
(2) Uniformly mixing the depolymerized lignin dispersion liquid and a silane coupling agent, and standing for a period of time to obtain a lignin modified liquid; in the step, the molecule of the silane coupling agent has epoxy group;
(3) Vacuum drying the lignin modified solution, putting the dried product and diisocyanate into xylene, heating in a water bath heating condition, stirring for a period of time, and then vacuum drying to remove xylene to obtain modified lignin;
the second method comprises the following steps:
(1) Dissolving sodium hydroxide and hydrogen peroxide in deionized water to obtain depolymerization liquid; mixing lignin and depolymerized liquid, standing for a period of time, and introducing sulfur dioxide gas into the mixed liquid until the mixed liquid is neutral to obtain depolymerized lignin dispersion liquid;
(2) Uniformly mixing the depolymerized lignin dispersion liquid and a silane coupling agent, and standing for a period of time to obtain a lignin modified liquid; in the step, the molecule of the silane coupling agent has epoxy group;
(3) And (3) carrying out vacuum drying on the lignin modified liquid, putting the dried product and diisocyanate into dimethylbenzene, heating under the water bath heating condition, stirring for a period of time, and carrying out vacuum drying to remove the dimethylbenzene to obtain the modified lignin.
2. The high heat and deformation resistance electric tool cooling fan of claim 1, wherein said a-component comprises the following components in parts by weight: 5-7 parts of amine curing agent, 25-35 parts of diluent, 5-7 parts of toughening agent and 2.5-3.5 parts of foaming agent, wherein the component B comprises the following components in parts by weight: 45-55 parts of epoxy resin, 25-35 parts of diluent and 7-9 parts of foam stabilizer.
3. The high heat resistance, deformation resistance electric tool cooling fan of claim 1 wherein the component of the toughening agent comprises acrylic acid and the component of the blowing agent comprises azobisisobutyronitrile.
4. The high heat resistance and deformation resistance electric tool cooling fan according to claim 3, wherein the component of the foaming agent further comprises dihydrate gypsum crystals.
5. The high heat and deformation resistance electric tool cooling fan according to claim 1, wherein the substrate is a metal substrate or a film-coated metal substrate, and the film-coated metal substrate is a metal substrate having a porous film layer attached to a surface thereof.
6. The high heat and deformation resistant electric tool cooling fan of claim 5, wherein the film-coated metal substrate is prepared as follows:
(1) Uniformly mixing silica sol, silicon rubber powder and starch to obtain a coating solution;
(2) And coating the coating liquid on the surface of the metal substrate, then carrying out vacuum quenching on the metal substrate, and cooling the metal substrate to obtain the film-coated metal substrate.
7. The process for producing a high heat-resistant deformation-resistant electric tool cooling fan according to any one of claims 1 to 6, comprising the steps of:
(1) Uniformly mixing the component A and the component B of the binder to obtain the binder, and then coating the binder on the surface of the substrate;
(2) The heat-resistant polymer plate is attached to the adhesive layer, and then the substrate and the heat-resistant polymer plate are baked until the adhesive is completely cured to form the adhesive layer, so that the composite blade is obtained;
(3) And connecting a plurality of composite blades to the fan framework to obtain the high-heat-resistance and deformation-resistance cooling fan for the electric tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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