CN113897029B - Glass fiber reinforced plastic prepreg for high-speed fan blade - Google Patents
Glass fiber reinforced plastic prepreg for high-speed fan blade Download PDFInfo
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- CN113897029B CN113897029B CN202111351505.9A CN202111351505A CN113897029B CN 113897029 B CN113897029 B CN 113897029B CN 202111351505 A CN202111351505 A CN 202111351505A CN 113897029 B CN113897029 B CN 113897029B
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/24—Impregnating materials with prepolymers which can be polymerised in situ, e.g. manufacture of prepregs
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/5026—Amines cycloaliphatic
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- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/50—Amines
- C08G59/52—Amino carboxylic acids
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- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/16—Ethene-propene or ethene-propene-diene copolymers
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- C08K7/00—Use of ingredients characterised by shape
- C08K7/02—Fibres or whiskers
- C08K7/04—Fibres or whiskers inorganic
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- C08K7/26—Silicon- containing compounds
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- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a glass fiber reinforced plastic prepreg for high-speed fan blades, and relates to the technical field of high polymer materials. The invention discloses a glass fiber reinforced plastic prepreg for high-speed fan blades, which is a glass fiber prepreg containing glass fibers and an epoxy resin composition, wherein the epoxy resin composition comprises 100 parts of epoxy resin, 15-35 parts of a composite curing agent, 1-4 parts of a curing accelerator, 10-15 parts of a toughening agent and 3-5 parts of a silane coupling agent; the glass fiber prepreg comprises 45-65% by weight of glass fiber; the compound curing agent is a mixed curing agent of hindered amine and diaminomethylcyclohexane; the toughening agent is ethylene propylene diene monomer rubber/nano SiO 2 A complex. The invention provides a glass fiber reinforced plastic prepreg for a high-speed fan blade and a preparation method thereof, wherein the prepreg has excellent high-low temperature stability, mechanical strength, shock resistance, corrosion resistance and wear resistance, and has good bonding strength with an adhesive, and the preparation process of the blade is unlimited.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to a glass fiber reinforced plastic prepreg for a high-speed fan blade and a preparation method thereof.
Background
The high-speed fan blade is an important part of a fan system, and the blade in high-speed operation bears high centrifugal force and alternating load; the fan blade is required to adapt to the influence of external environmental factors; meanwhile, the impact of impurities in the air on the blade is faced, so that the blade material needs to meet the following conditions: has higher mechanical property and creep resistance; the vibration damping capacity is high; high tissue stability; good corrosion resistance and erosion resistance; also has good technological properties. The current high-speed fan blade is mainly manufactured by paving prepreg layers and then heating and curing.
Epoxy resin has the characteristics of strong binding power, good processability, small shrinkage rate and the like, and becomes one of thermosetting resins most applied in the field of prepregs, but the epoxy resin has high crosslinking density and high brittleness, and the fatigue resistance and impact toughness of the epoxy resin are difficult to meet the requirements of blade performance. The toughness of the existing epoxy resin is improved mainly by adding a toughening agent, such as liquid nitrile rubber, polyamide resin and the like, but the bending strength, tensile strength, heat resistance and the like of the material are reduced to different degrees, and a plurality of defects exist.
Glass fiber has the advantages of high strength, stable size, high temperature resistance, corrosion resistance and the like, is commonly used as a reinforcing matrix in prepreg, but is brittle, not folding-resistant, not wear-resistant and the like, and seriously affects the service life of the blade. In the prior art, the surface treatment method of the glass fiber mainly adopts a sizing agent for treatment, the sizing agent contains a coupling agent, the coupling agent content is higher, the property is unstable, and the actual use effect is affected; the impregnating compound contains more components, the storage stability is required to be improved, and phase separation often occurs in the use process, so that the impregnation quality is affected.
Therefore, the defects of the epoxy resin and the glass fiber often lead to the defects of low mechanical strength, poor high-temperature performance, insufficient erosion resistance and the like of the glass fiber prepreg, influence the service life of the blade and lead to higher cost.
Disclosure of Invention
The invention aims to provide a glass fiber reinforced plastic prepreg for a high-speed fan blade and a preparation method thereof, wherein the prepreg has excellent high-low temperature stability, mechanical strength, impact resistance, corrosion resistance and wear resistance, has good bonding strength with an adhesive, and has no limit on the preparation process of the blade.
In order to achieve the aim of the invention, the invention provides a glass fiber reinforced plastic prepreg for a high-speed fan blade, which is a glass fiber prepreg containing glass fiber and an epoxy resin composition, wherein the epoxy resin composition comprises 100 parts of epoxy resin, 15-35 parts of a composite curing agent, 1-4 parts of a curing accelerator, 10-15 parts of a toughening agent and 3-5 parts of a silane coupling agent;
the glass fiber prepreg comprises 45-65% by weight of glass fiber;
the compound curing agent is a mixed curing agent of hindered amine and diaminomethylcyclohexane;
the toughening agent is ethylene propylene diene monomer rubber/nano SiO 2 A complex.
Further, the glass fiber is a glass fiber uniaxial cloth.
Further, the ethylene propylene diene monomer rubber/nano SiO 2 The preparation method of the compound comprises the following steps: nano SiO 2 Adding into triisopropanolamine, heating to 70-80deg.C, stirring for 30-45min, naturally cooling, adding ethylene propylene diene monomer and odorless DCP, stirring at 40-50deg.C for 10-15min, and cooling to room temperature to obtain ethylene propylene diene monomer/nanometer SiO 2 A complex.
Further, the mass ratio of the ethylene propylene diene monomer to the odorless DCP is 1: (0.05-0.08), the ethylene propylene diene monomer rubber and the nano SiO 2 The mass ratio is 1: (0.35-0.55), the nano SiO 2 The mass ratio of the tri-isopropanolamine to the triisopropanolamine is 1: (0.1-0.15).
Further, the mass ratio of the hindered amine to the diaminomethylcyclohexane in the composite curing agent is (0.36-0.4): 1, wherein the hindered amine is polyaspartic acid ester.
Further, the curing accelerator is any one of triphenylphosphine or 2-methylimidazole.
The invention also provides a preparation method of the glass fiber reinforced plastic prepreg for the high-speed fan blade, which specifically comprises the following steps:
(1) Adding the glass fiber uniaxial cloth into anhydrous oxalic acid, soaking for 1-2h, taking out, and then placing in a high-temperature furnace for heat treatment, wherein the heat treatment temperature is 150-200 ℃ and the heat treatment time is 0.5-1h for standby;
(2) Mixing epoxy resin and a toughening agent, adding the mixture into a reaction kettle, heating to 80 ℃, stirring for 20-45min, cooling to room temperature, adding a composite curing agent and a curing accelerator, continuously stirring for 10min, adding a silane coupling agent, and uniformly stirring to obtain an epoxy resin composition;
(3) Immersing the epoxy resin composition into the glass fiber single-shaft cloth treated in the step (1) of protecting the double-sided release paper by using a rubber roller for rolling, curling, sealing, and naturally thickening at room temperature for 1-3 days or preserving heat at 50 ℃ for 15-30min to obtain the glass fiber reinforced plastic prepreg.
The invention provides a using method of glass fiber reinforced plastic prepreg, which comprises the following steps: the glass fiber reinforced plastic prepreg can be directly stacked layer by layer after the double-sided release paper is peeled off, and can be stacked by heating and vacuumizing or stacked by vacuumizing at normal temperature.
The invention has the following beneficial effects:
1. the composite curing agent is formed by compounding polyaspartic acid ester and diaminomethyl cyclohexane, so that the epoxy resin composition is cured at a lower temperature, the prepreg still has higher mechanical strength, and the corrosion resistance and impact strength of the prepreg in a humid environment are obviously improved.
2. The toughening agent adopts ethylene propylene diene monomer rubber and nano SiO 2 Is compounded under the action of odorless DCP and triisopropanolamine, and the toughening agent combines ethylene propylene diene monomer and nano SiO 2 The toughness, corrosion resistance and wear resistance of the prepreg are enhanced, and the mechanical strength and impact resistance of the prepreg are obviously improved; nano SiO in the toughening agent 2 Can be uniformly dispersed in the compound, and can be effectively combined with ethylene propylene diene monomer rubber to well act on the epoxy resin composition, thereby increasing the toughening effect of the toughening agent and improving the mechanical strength of the prepreg.
3. According to the glass fiber disclosed by the invention, anhydrous oxalic acid is adopted for pretreatment, so that the glass fiber with a surface coating is obtained, and the coating layer is an inorganic coating, so that the strength and high temperature resistance of the glass fiber are improved, and the binding force of the glass fiber and the epoxy resin composition is increased, thereby further improving the strength and high temperature resistance of the prepreg.
4. The prepreg is prepared by a low-temperature low-pressure rubber roller rolling method, so that the glass fiber and the epoxy resin are fully impregnated, the production process is simple, the repeatability is good, and the cost is low.
5. The glass fiber reinforced plastic prepreg for the high-speed fan blade, which is prepared by the invention, has the advantages of simple preparation process, easiness in processing, lower curing temperature, shorter curing time and lower production cost.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The glass fiber reinforced plastic prepreg for the high-speed fan blade and the preparation method thereof are described below with reference to specific examples.
The epoxy resin used in the invention is CYDF175 of Baling petrochemical industry; polyaspartic acid ester is coset NH 1520; ethylene propylene diene monomer is 4760P of America Dow; the silane coupling agent is vinyl triethoxy silicon.
The glass fiber of the invention adopts S-level high-strength glass fiber uniaxial cloth with the linear density of 1200 tex.
Example 1
The glass fiber reinforced plastic prepreg for the high-speed fan blade in the embodiment is a glass fiber prepreg containing glass fibers and an epoxy resin composition. The weight percentage of glass fiber in the glass fiber prepreg was 58%, and the weight percentage of the epoxy resin composition was 42%. The epoxy resin composition comprises, by weight, 100 parts of epoxy resin, 15 parts of a composite curing agent, 4 parts of a curing accelerator, 15 parts of a toughening agent and 5 parts of a silane coupling agent.
The preparation method of the glass fiber reinforced plastic prepreg specifically comprises the following steps:
(1) Adding the glass fiber uniaxial cloth into anhydrous oxalic acid, soaking for 2 hours, taking out, and then placing in a high-temperature furnace for heat treatment, wherein the heat treatment temperature is 180 ℃, and the heat treatment time is 1 hour for standby;
(2) Mixing epoxy resin and a toughening agent, adding the mixture into a reaction kettle, heating to 80 ℃, stirring for 45min, cooling to room temperature, adding a composite curing agent and a curing accelerator, continuously stirring for 10min, adding a silane coupling agent, and uniformly stirring to obtain an epoxy resin composition;
(3) Immersing the epoxy resin composition into the glass fiber single-shaft cloth treated in the step (1) of protecting the double-sided release paper by using a rubber roller for rolling, curling and sealing, then preserving heat at 50 ℃ for 25min, and cooling to room temperature to obtain the glass fiber reinforced plastic prepreg.
The composite curing agent is prepared by mixing polyaspartic acid ester and diaminomethyl cyclohexane, and the mass ratio of the polyaspartic acid ester to the diaminomethyl cyclohexane is 0.36:1.
the toughening agent is ethylene propylene diene monomer rubber/nano SiO 2 The preparation method of the compound comprises the following steps: 35 parts of nano SiO 2 Adding into 3.5 parts of triisopropanolamine, heating to 80 ℃, stirring for 40min, naturally cooling, then adding 100 parts of ethylene propylene diene monomer and 5 parts of odorless DCP, stirring for 10min at 50 ℃, and cooling to room temperature to obtain ethylene propylene diene monomer/nano SiO 2 A complex.
The curing accelerator is triphenylphosphine.
Example 2
The glass fiber reinforced plastic prepreg for the high-speed fan blade in the embodiment is a glass fiber prepreg containing glass fibers and an epoxy resin composition. The weight percentage of glass fiber in the glass fiber prepreg was 58%, and the weight percentage of the epoxy resin composition was 42%. The epoxy resin composition comprises, by weight, 100 parts of epoxy resin, 35 parts of a composite curing agent, 2 parts of a curing accelerator, 10 parts of a toughening agent and 3 parts of a silane coupling agent.
The preparation method of the glass fiber reinforced plastic prepreg in this embodiment is the same as that in embodiment 1, and specific reference is made to embodiment 1.
The composite curing agent is prepared by mixing polyaspartic acid ester and diaminomethyl cyclohexane, and the mass ratio of the polyaspartic acid ester to the diaminomethyl cyclohexane is 0.4:1.
the toughening agent is ethylene propylene diene monomer rubber/nano SiO 2 The preparation method of the compound comprises the following steps: 55 parts of nano SiO 2 Adding into 8.25 parts of triisopropanolamine, heating to 80 ℃, stirring for 40min, naturally cooling, then adding 100 parts of ethylene propylene diene monomer and 8 parts of odorless DCP, stirring for 10min at 50 ℃, and cooling to room temperature to obtain ethylene propylene diene monomer/nano SiO 2 A complex.
The curing accelerator is 2-methylimidazole.
Example 3
The glass fiber reinforced plastic prepreg for the high-speed fan blade in the embodiment is a glass fiber prepreg containing glass fibers and an epoxy resin composition. The weight percentage of glass fiber in the glass fiber prepreg was 58%, and the weight percentage of the epoxy resin composition was 42%. The epoxy resin composition comprises, by weight, 100 parts of epoxy resin, 20 parts of a composite curing agent, 1 part of a curing accelerator, 15 parts of a toughening agent and 4 parts of a silane coupling agent.
The preparation method of the glass fiber reinforced plastic prepreg in this embodiment is the same as that in embodiment 1, and specific reference is made to embodiment 1.
The composite curing agent is prepared by mixing polyaspartic acid ester and diaminomethyl cyclohexane, and the mass ratio is 2:5.
the toughening agent is ethylene propylene diene monomer rubber/nano SiO 2 The preparation method of the compound comprises the following steps: 42 parts of nano SiO 2 Adding into 6.3 parts of triisopropanolamine, heating to 80 ℃, stirring for 40min, naturally cooling, then adding 100 parts of ethylene propylene diene monomer and 7 parts of odorless DCP, stirring for 10min at 50 ℃, and cooling to room temperature to obtain ethylene propylene diene monomer/nano SiO 2 A complex.
The curing accelerator is 2-methylimidazole.
Example 4
The glass fiber reinforced plastic prepreg for the high-speed fan blade in the embodiment is a glass fiber prepreg containing glass fibers and an epoxy resin composition. The weight percentage of glass fiber in the glass fiber prepreg was 58%, and the weight percentage of the epoxy resin composition was 42%. The epoxy resin composition comprises, by weight, 100 parts of epoxy resin, 26 parts of a composite curing agent, 3 parts of a curing accelerator, 12 parts of a toughening agent and 5 parts of a silane coupling agent.
The preparation method of the glass fiber reinforced plastic prepreg in this embodiment is the same as that in embodiment 1, and specific reference is made to embodiment 1.
The composite curing agent is prepared by mixing polyaspartic acid ester and diaminomethyl cyclohexane, and the mass ratio is 2:5.
the toughening agent is ethylene propylene diene monomer rubber/nano SiO 2 The preparation method of the compound comprises the following steps: 42 parts of nano SiO 2 Adding into 6.3 parts of triisopropanolamine, heating to 80 ℃, stirring for 40min, naturally cooling, then adding 100 parts of ethylene propylene diene monomer and 7 parts of odorless DCP, stirring for 10min at 50 ℃, and cooling to room temperature to obtain ethylene propylene diene monomer/nano SiO 2 A complex.
The curing accelerator is 2-methylimidazole.
Example 5
The glass fiber reinforced plastic prepreg for the high-speed fan blade in the embodiment is a glass fiber prepreg containing glass fibers and an epoxy resin composition. The glass fiber prepreg was 45% by weight of glass fiber and the epoxy resin composition was 55% by weight. The raw material components and proportions of the epoxy resin composition were the same as those in example 4, and specific reference was made to example 4.
The preparation method of the glass fiber reinforced plastic prepreg in this embodiment is the same as that in embodiment 1, and specific reference is made to embodiment 1.
Example 6
The glass fiber reinforced plastic prepreg for the high-speed fan blade in the embodiment is a glass fiber prepreg containing glass fibers and an epoxy resin composition. The glass fiber prepreg has a glass fiber weight percentage of 65% and an epoxy resin composition weight percentage of 35%. The raw material components and proportions of the epoxy resin composition were the same as those in example 4, and specific reference was made to example 4.
The preparation method of the glass fiber reinforced plastic prepreg in this embodiment is the same as that in embodiment 1, and specific reference is made to embodiment 1.
Comparative example 1
The raw materials and the preparation method of the glass fiber reinforced plastic prepreg for the high-speed fan blade of the comparative example are the same as those of example 4, except that the toughening agent is not added to the epoxy resin composition of the present invention.
Comparative example 2
The raw materials and preparation method of the glass fiber reinforced plastic prepreg for the high-speed fan blade of the comparative example are the same as those of the example 4, except that the toughening agent in the epoxy resin composition of the invention is ethylene propylene diene monomer rubber and nano SiO 2 The mass ratio of the two substances was the same as in example 4.
Comparative example 3
The raw materials and the preparation method of the glass fiber reinforced plastic prepreg for the high-speed fan blade of the comparative example are the same as those of example 4, except that polyaspartic acid ester is not added to the composite curing agent of the epoxy resin composition of the present invention.
Comparative example 4
The raw materials and the preparation method of the glass fiber reinforced plastic prepreg for the high-speed fan blade of the comparative example are the same as those of example 4, except that the glass fiber of the present invention is not pretreated with anhydrous oxalic acid.
The glass fiber reinforced plastic prepregs prepared in examples 1-6 and comparative examples 1-4 were cured at 120 ℃ for 5 hours, cooled to room temperature, and then cut into samples to prepare required test samples, and the test samples were subjected to performance testing according to the standard, and the performance test results are shown in table 1.
Peel strength is referred to JIS C6481: 1996 to measure peel strength (N/25 mm) with copper foil (curing time 120 ℃ C. For 5 hours);
tensile strength was tested against the GB/T1447-2005 standard;
flexural strength was tested against the GB/T1449-2005 standard;
compressive strength was tested against the GB/T1448-2005 standard;
impact toughness was tested with reference to GB/T1451-2005 standard.
Table 1 table of test results of the performance of the glass fiber reinforced plastic prepreg for the high speed fan blade
As is clear from Table 1, the glass fiber reinforced plastic prepreg prepared by the present invention has excellent tensile strength, impact toughness, bending strength and peel strength. According to the invention, the strength and toughness of the composite material are obviously improved by adding the selected toughening agent; by pre-treating the glass fibers, the peel strength of the invention is significantly improved. The present invention uses polyaspartic acid ester as a component of the curing agent, shows the strength increase shown in the above table 1, and the present invention has excellent corrosion resistance when salt spray tests (refer to GJB 150.11a-2009 (96 h) standard) are performed on examples 1 to 6, and the surface of the test sample is free from cracks and flaking.
The application method of the glass fiber reinforced plastic prepreg in the high-speed fan blade comprises the following steps: the glass fiber reinforced plastic prepreg can be directly stacked layer by layer after the double-sided release paper is peeled off, can be heated (50 ℃) to be vacuumized and stacked, can also be vacuumized and stacked at normal temperature, and can be obtained by placing the blade at 80-150 ℃ for curing after the blade is stacked, wherein the optimized curing temperature is 100-120 ℃, and the curing time is 4-10 hours.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (3)
1. The glass fiber reinforced plastic prepreg for the high-speed fan blade is glass fiber prepreg containing glass fiber and epoxy resin composition, and is characterized in that the epoxy resin composition comprises 100 parts of epoxy resin, 15-35 parts of composite curing agent, 1-4 parts of curing accelerator, 10-15 parts of toughening agent and 3-5 parts of silane coupling agent;
the glass fiber prepreg comprises 45-65% by weight of glass fiber;
the composite curing agent is a mixed curing agent of hindered amine and diaminomethylcyclohexane, and the mass ratio of the hindered amine to the diaminomethylcyclohexane is (0.36-0.4): 1, wherein the hindered amine is polyaspartic acid ester;
the toughening agent is an ethylene propylene diene monomer/nano SiO2 compound, and the preparation method of the ethylene propylene diene monomer/nano SiO2 compound comprises the following steps: adding nano SiO2 into triisopropanolamine, heating to 70-80 ℃, stirring for 30-45min, naturally cooling, then adding ethylene propylene diene monomer and odorless DCP, stirring for 10-15min at 40-50 ℃, and cooling to room temperature to obtain an ethylene propylene diene monomer/nano SiO2 compound;
the mass ratio of the ethylene propylene diene monomer to the odorless DCP is 1: (0.05-0.08), the mass ratio of the ethylene propylene diene monomer to the nano SiO2 is 1: (0.35-0.55), wherein the mass ratio of the nano SiO2 to the triisopropanolamine is 1: (0.1-0.15);
the glass fiber is glass fiber uniaxial cloth.
2. The glass fiber reinforced plastic prepreg for a high-speed fan blade according to claim 1, wherein the curing accelerator is any one of triphenylphosphine or 2-methylimidazole.
3. The method for preparing the glass fiber reinforced plastic prepreg for the high-speed fan blade according to claim 1 or 2, which is characterized by comprising the following steps:
(1) Adding the glass fiber uniaxial cloth into anhydrous oxalic acid, soaking for 1-2h, taking out, and then placing in a high-temperature furnace for heat treatment, wherein the heat treatment temperature is 150-200 ℃ and the heat treatment time is 0.5-1h for standby;
(2) Mixing epoxy resin and a toughening agent, adding the mixture into a reaction kettle, heating to 80 ℃, stirring for 20-45min, cooling to room temperature, adding a composite curing agent and a curing accelerator, continuously stirring for 10min, adding a silane coupling agent, and uniformly stirring to obtain an epoxy resin composition;
(3) Immersing the epoxy resin composition into the glass fiber single-shaft cloth treated in the step (1) of protecting the double-sided release paper by using a rubber roller for rolling, curling, sealing, and naturally thickening at room temperature for 1-3 days or preserving heat at 50 ℃ for 15-30min to obtain the glass fiber reinforced plastic prepreg.
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| CN115109506B (en) * | 2022-07-07 | 2024-05-17 | 湖南弘辉科技有限公司 | Anticorrosive paint for fan blades and preparation method thereof |
| CN117865510A (en) * | 2024-03-13 | 2024-04-12 | 航天长征睿特科技有限公司 | Glass fiber reinforced material for wind power blade and preparation method thereof |
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