CN115678204A - Epoxy fiber composite material for wind power blade and preparation method thereof - Google Patents

Epoxy fiber composite material for wind power blade and preparation method thereof Download PDF

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CN115678204A
CN115678204A CN202211111979.0A CN202211111979A CN115678204A CN 115678204 A CN115678204 A CN 115678204A CN 202211111979 A CN202211111979 A CN 202211111979A CN 115678204 A CN115678204 A CN 115678204A
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epoxy resin
glycidyl ester
composite material
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wind power
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马寒冰
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Sichuan Dongshu New Material Co ltd
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Southwest University of Science and Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract

An epoxy fiber composite material for wind power blades and a preparation method thereof relate to material technology and environmental protection technology, and the preparation method comprises the following steps: (1) preparation of glycidyl ester type epoxy resin: mixing the low molecular weight glycidyl ester type epoxy resin with a chain extension modifier, and reacting to combine the low molecular weight glycidyl ester type epoxy resin molecules into high molecular weight glycidyl ester type epoxy resin molecules through chain extension; (2) preparation of epoxy resin composition: uniformly mixing the glycidyl ester type epoxy resin prepared in the step (1) with an amine curing agent at room temperature to obtain an epoxy resin composition; (3) And (3) impregnating inorganic fibers with the epoxy resin composition, and drying to obtain the epoxy composite material for the wind power blade. The wind power blade material disclosed by the invention is good in mechanical property, high in heat resistance, low in production cost and easy to recycle.

Description

Epoxy fiber composite material for wind power blade and preparation method thereof
Technical Field
The invention relates to a material technology and an environment-friendly technology, in particular to a blade material of a wind power generator.
Background
With the increasing demand for clean energy, wind power generation has been rapidly developed in recent years. The wind power blade is an important component of a wind power generator, and is mainly made of resin (thermosetting resin: epoxy resin, unsaturated polyester and thermoplastic resin: polyethylene terephthalate, polybutylene terephthalate, nylon and the like) and a reinforcing material (glass fiber, carbon fiber and the like), wherein an epoxy resin/glass fiber composite material system has high mechanical property, heat resistance, creep resistance and low production cost, and is the system with the largest use amount of the wind power blade at present.
At present, a common thermosetting epoxy resin/glass fiber composite material system for wind power blades is difficult to recycle after decommissioning due to the problems of difficult melting and difficult dissolution, so that serious resource waste and environmental pollution are caused.
In order to explore the scheme of recovering the blade, two solutions are proposed at home and abroad from the perspective of raw materials and recovery technology: thermoplastic resin and synthetic novel thermosetting resin containing degradable group or structure are adopted.
The thermoplastic resin is adopted: for example, the thermoplastic resin composition comprises CBT 200 thermoplastic resin PBT (polybutylene terephthalate) developed by Cyclics, nylon 6 developed by Holland Delv university of technology, elium acrylic acid-based thermoplastic resin developed by Acomata, wanhua chemical CN201811322671.4, a thermoplastic epoxy resin composition and application thereof, and a crystalline thermoplastic epoxy resin cured product and a preparation method thereof, but the thermoplastic resin has relatively high viscosity, low wettability with glass fiber or carbon fiber, and low content of fiber reinforced material, so that the performances such as mechanical strength and the like are insufficient.
Synthesizing a novel thermosetting resin containing degradable groups or structures: the method refers to synthesizing a novel thermosetting resin containing degradable groups or structures, and mainly comprises introducing dynamic covalent bonds and degradable groups into the thermosetting resin.
The dynamic covalent bonds introduced include ester bonds, imine bonds, acetal bonds, disulfide bonds, borate bonds, DA additions, and the like. Such as: epoxy prepolymers such as Ludwik Leibler react with fatty acids or anhydrides to form ester bonds in the crosslinked network of the epoxy resin, and the transesterification reaction at high temperature changes and rearranges the topology of the network, thereby imparting viscoelasticity and "flowability" (plasticity, reworkability) to the material. Ludwik Leibler defines a thermoset material with flow properties as "Vitrimer". As Vistimer has unchanged density of cross-linking points during processing and is similar to inorganic glass at high temperature, zhang Chi, qinghua university names the Vistimer as a glass-like polymer; the related patents of the epoxy vitrimer material comprise 'CN201910974144. X a method for regulating stress relaxation and reprocessing molding temperature of glass polymer material by dynamic bond content', 'CN 201910974152.4 a preparation method of epoxy fiber composite material with high strength, solvent resistance, quick detachability and recycling,' CN201910059771.0 a preparation method of thermosetting polymer which can be welded and reprocessed and molded at medium temperature ',' CN202110483313.7 a winding-molded fiber-reinforced epoxy glass polymer composite material ',' CN202110205291.8 a photoelectric magnetic-responsive glass polymer, and 'CN 110205702.3 a medium-low temperature curing epoxy type glass polymer', etc.; itaconate-based epoxy, vanillin-based epoxy, eugenol-based epoxy, epoxy resin glass polymer polymers (cross-linked networks have exchangeable bonds) and the like are researched by Masson's Ningbo material of Chinese academy of sciences and the like, and the applied patents include inventions of ' CN201810885870.X a spiral cyclic acetal modified degradable epoxy resin and a preparation method and application thereof ', ' CN201910202650.7 an acetal structure-based epoxy monomer and a preparation method and application thereof ', ' CN109320918.A recyclable carbon fiber reinforced epoxy resin composite material, a preparation method and application thereof ' and the like. Professor yao zhen of university of zhejiang, "method for preparing recyclable epoxy resin by using bulk click chemical reaction" and "method for preparing reversible crosslinking toughened epoxy resin by using bulk click chemical reaction" in CN 201810092901.6: the click reaction speed is high, the selectivity is high, and the method is an effective method for accurately controlling the structure of the macromolecular chain. The method comprises the following steps: 1) Adopting polyfunctional epoxy resin and furfuryl mercaptan to carry out click reaction under the action of a tertiary amine catalyst to obtain an intermediate with a furan functional group as an end group; 2) The intermediate and a cross-linking agent containing a maleimide group are subjected to Diels-Alder reaction to form reversibly cross-linked epoxy resin; "CN108129638A recyclable epoxy resin and preparation method" published wandong et al, a special aerospace material and technical research institute, who synthesized an amine curing agent with dynamic imine bridging bonds and cured with epoxy resin to prepare epoxy resin with dynamic bonds; CN112608452A a high-performance recoverable and easily repairable epoxy resin and a preparation method thereof, which disclose an epoxy resin containing dynamic borate bonds, which is prepared by the reaction of organic amine molecules with a phenylboronic acid group at one end and polybasic diol molecules or organic amine molecules with a single diol group at one end and the polybasic phenylboronic acid molecules.
In contrast, curing epoxy resins by introducing dynamic bonds or using reversible reactions in epoxy resins is an effective solution to the problem of epoxy resin recycling. However, compared with common epoxy resin, the degradable and recyclable epoxy resin reported at present has the defects of insufficient mechanical properties, heat resistance and other properties, high production cost, high curing temperature and large creep property of many epoxy systems, and the application of the degradable and recyclable epoxy resin in the fields of wind power blades and the like is limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing an epoxy fiber composite material for wind power blades, which is easy to recycle, aiming at the defects of the existing epoxy resin for wind power blades and a preparation method thereof.
The technical scheme adopted by the invention for solving the technical problems is that the epoxy fiber composite material for the wind power blade is characterized by comprising 10-30 parts of epoxy resin condensate and 70-90 parts of inorganic fiber by weight,
the inorganic fiber comprises any one of glass fiber, carbon fiber and basalt fiber;
the epoxy resin cured product comprises any one of the following compounds:
Figure BDA0003844076440000041
Figure BDA0003844076440000051
Figure BDA0003844076440000061
said R is 1 Is phenyl, cycloalkyl or alkyl;
the R is 2 Is phenyl, cycloalkyl or alkyl;
the R is 3 Is phenyl, cycloalkyl or alkyl;
said R is 4 Is phenyl, cycloalkyl or alkyl;
the R is 5 Is phenyl, cycloalkyl or alkyl;
the R is 6 Is phenyl, cycloalkyl or alkyl;
the R is 7 Is phenyl, cycloalkyl or alkyl;
the R is 8 Is phenyl, cycloalkyl or alkyl;
the R is 9 Is phenyl, cycloalkyl or alkyl;
the R is 10 Is phenyl, cycloalkyl or alkyl.
The epoxy resin condensate is obtained by the reaction of glycidyl ester type epoxy resin and an amine curing agent;
the glycidyl ester type epoxy resin is obtained by mixing and reacting 80-98 wt% of low molecular weight glycidyl ester type epoxy resin and 2-20 wt% of chain extension modifier;
the low molecular weight glycidyl ester type epoxy resin is any one of tetrahydrophthalic acid glycidyl ester, hexahydrophthalic acid glycidyl ester and 4, 5-epoxy hexane-1, 2-dicarboxylic acid diglycidyl ester,
the chain extension modifier is any one of an amine chain extender, an acid chain extender and an alcohol chain extender.
The inorganic fibers comprise at least two of glass fibers, carbon fibers and basalt fibers;
the amine curing agent comprises any one of isophorone diamine, triethylene tetramine and 4, 4-diamino diphenyl sulfone.
The invention also provides a preparation method of the epoxy fiber composite material for the wind power blade, which comprises the following steps:
(1) Preparation of glycidyl ester type epoxy resin: mixing low-molecular-weight glycidyl ester type epoxy resin with a chain extension modifier, and reacting to combine the low-molecular-weight glycidyl ester type epoxy resin with a chain extension into high-molecular-weight glycidyl ester type epoxy resin molecules;
the low molecular weight glycidyl ester type epoxy resin is tetrahydrophthalic acid glycidyl ester, hexahydrophthalic acid glycidyl ester or 4, 5-epoxy hexane-1, 2-dicarboxylic acid diglycidyl ester,
the chain extension modifier is an amine chain extender, an acid chain extender or an alcohol chain extender;
(2) Preparation of epoxy resin composition: uniformly mixing the glycidyl ester type epoxy resin prepared in the step (1) with an amine curing agent at room temperature to obtain an epoxy resin composition;
(3) And (3) impregnating inorganic fibers with the epoxy resin composition, and drying to obtain the epoxy composite material for the wind power blade.
In the step (1), the viscosity of the mixture is controlled within the range of 3000-5000 mPa.s;
in the step (2), the viscosity of the mixture is controlled within the range of 200 to 300mPa.s.
Further, the step (3) is: and (3) impregnating inorganic fibers with the epoxy resin composition under the air pressure of 0.01-0.02 Mpa, standing under the air pressure of more than 0.2Mpa, and drying to obtain the epoxy composite material for the wind power blade.
In the step (1), the low molecular weight glycidyl ester type epoxy resin is mixed according to the mixture ratio of 80 to 98 weight percent and 2 to 20 weight percent of chain extension modifier.
The amine curing agent comprises any one of isophorone diamine, triethylene tetramine and 4, 4-diamino diphenyl sulfone.
The wind power blade material provided by the invention has the advantages of good mechanical property, high heat resistance and low production cost. According to the invention, the chain extension of micromolecules with low molecular weight is adopted as a macromolecular structure, so that the gel reaction time is prolonged, and great convenience is provided for construction.
Particularly, the wind power blade adopting the technology of the invention is easy to recycle, the epoxy resin/glass fiber composite material can be degraded through alcohol with high boiling point such as ethylene glycol, after the glass fiber is separated, the degraded ethylene glycol epoxy solution is purified and separated, the dihydric alcohol part is used for re-synthesizing the epoxy resin, and the polyhydric alcohol part is used as a flame retardant additive and the like.
In a word, the invention has the advantages of simple recycling process, high recycling rate, no discharge of three wastes, environmental protection, low recycling cost and higher economy.
Drawings
FIG. 1 is a graph of the heat resistance of the epoxy composition of the present invention.
Detailed Description
The invention firstly utilizes the low-cost glycidyl ester epoxy to prepare the epoxy resin composition and uses the epoxy resin composition to prepare the epoxy resin/glass fiber composite material.
The principle of the invention is as follows:
firstly, aniline and other amines containing two active hydrogen, tetrahydrophthalic acid, hexahydrophthalic acid and other acids containing two carboxyl groups, or ethylene glycol, butanediol and other alcohols containing two hydroxyl groups are used for carrying out chain extension reaction on tetrahydrophthalic acid glycidyl ester, hexahydrophthalic acid glycidyl ester and other glycidyl esters, and by adjusting the molecular weight and the reaction activity of the glycidyl ester, the later gel reaction time and the later reaction heat can be adjusted, the construction time of the product can be prolonged, and the thermal stress can be reduced;
then, the product after chain extension is mixed with amine curing agents such as isophorone diamine, p-phenylene diamine, polyether amine, imidazole and the like according to a proportion, and diluents such as propylene oxide butyl ether and the like can be added to adjust the viscosity, so as to prepare the epoxy composition. And finally, compounding and molding the epoxy composition and the glass fiber cloth through a vacuum pressure infusion process to obtain the novel epoxy fiber composite material.
The wind power blade material can be fully recycled at low cost. The novel epoxy/glass fiber composite material is cut into blocks, mixed with glycol and heated for reflux, and the epoxy resin in the novel epoxy/glass fiber composite material can be degraded into glycol solution, wherein the main components of the glycol solution are dihydroxy ester of tetrahydrophthalic acid, hexahydrophthalic acid and the like and polyhydric alcohol containing nitrogen. The glass fibers in the composite material can be re-extracted by filtration. After the ethylene glycol solution is heated and concentrated, adding NaOH solution, hydrolyzing dihydroxy esters of tetrahydrophthalic acid and hexahydrophthalic acid in the ethylene glycol solution to form sodium salts of tetrahydrophthalic acid and hexahydrophthalic acid, then adding hydrochloric acid to convert the sodium salts into acid, utilizing the characteristic reaction that the tetrahydrophthalic acid and the hexahydrophthalic acid are insoluble in water and ethylene glycol to extract the tetrahydrophthalic acid and the hexahydrophthalic acid by a filtration method, and then adding epoxy chloropropane and quaternary ammonium salt to synthesize the tetrahydrophthalic acid and the hexahydrophthalic acid into glycidyl tetrahydrophthalic acid and glycidyl hexahydrophthalic acid, thereby realizing the cyclic utilization of the epoxy resin. The remaining nitrogen-containing polyol and the like can be used for applications such as flame retardant additives.
Embodiment of the preparation method:
the invention provides a preparation method of an epoxy composite material for wind power blades, which comprises the following steps:
(1) Preparation of glycidyl ester type epoxy resin: firstly, mixing low-molecular-weight glycidyl ester type epoxy resin with a modifier at room temperature, standing for 2 hours, then reacting for 8 hours at 80 ℃, and controlling the viscosity of the mixture within the range of 3000-5000mPa.s;
(2) Preparation of epoxy resin composition: uniformly mixing the glycidyl ester type epoxy resin prepared in the step (1) with an amine curing agent, a diluent and a toughening agent at room temperature, and controlling the viscosity of the mixture within the range of 200-300mPa.s;
(3) Preparation of epoxy/fiber composite: and (3) stacking the inorganic fibers in a vacuum pressure tank, vacuumizing, controlling the vacuum pressure to be 0.01-0.02 MPa, injecting the epoxy resin composition prepared in the step (2) into the vacuum pressure tank, standing for 1-2 h, then increasing the pressure of the vacuum pressure tank to be 0.4MPa through high-pressure nitrogen, and standing for 1-8 h. Finally, the temperature is raised to 80 ℃, and the mixture is kept stand and solidified for 1 to 8 hours.
The glycidyl ester type epoxy resin is prepared by mixing and reacting 80-98 wt% of low molecular weight glycidyl ester type epoxy resin and 2-20 wt% of modifier,
the low molecular weight glycidyl ester type epoxy resin is tetrahydrophthalic acid glycidyl ester, hexahydrophthalic acid glycidyl ester or 4, 5-epoxy hexane-1, 2-dicarboxylic acid diglycidyl ester,
the modifier is any one of aniline, tetrahydrophthalic acid and hexahydrophthalic acid.
The inorganic fibers comprise at least two of glass fibers, carbon fibers and basalt fibers;
the amine curing agent comprises any one of isophorone diamine, triethylene tetramine and 4, 4-diamino diphenyl sulfone.
Example 1
In the embodiment, tetrahydrophthalic acid diglycidyl ester is used as a raw material, chain extension is firstly performed, an amine curing agent and the like are added to form an epoxy mixed solution, and then the epoxy mixed solution is compounded with inorganic fibers and cured to obtain the wind power blade material.
Chain extension can be achieved by amine chain extenders, acid chain extenders or alcohol chain extenders, as follows:
reaction materials: diglycidyl tetrahydrophthalate, having the structural formula:
Figure BDA0003844076440000101
(A1) Carrying out chain extension by using an amine chain extender H2N-R1, wherein the reaction formula is as follows:
Figure BDA0003844076440000102
R 1 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000111
R 2 phenyl, cycloalkyl, alkyl, and the like.
(A2) Carrying out chain extension reaction by using an acid chain extender:
Figure BDA0003844076440000112
R 3 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000113
(A3) Carrying out chain extension reaction by using an alcohol chain extender:
Figure BDA0003844076440000121
R 4 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000122
example 2
In the embodiment, hexahydrophthalic acid diglycidyl ester is used as a raw material, chain extension is firstly performed, an amine curing agent and the like are added to form an epoxy mixed solution, and then the epoxy mixed solution is compounded with inorganic fibers and cured to obtain the wind power blade material.
Chain extension can be achieved by amine chain extenders, acid chain extenders or alcohol chain extenders, as follows:
the reactants are as follows: the structural formula of the hexahydrophthalic acid diglycidyl ester is shown in the specification
Figure BDA0003844076440000123
(B1) Chain extension is carried out by using an amine chain extender, and the reaction formula is as follows:
Figure BDA0003844076440000131
R 5 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000132
(B2) Carrying out chain extension reaction by using an acid chain extender:
Figure BDA0003844076440000133
R 6 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000141
(B3) Carrying out chain extension reaction by using an alcohol chain extender:
Figure BDA0003844076440000142
R 7 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000143
example 3
In the embodiment, 4, 5-epoxyhexane-1, 2-dicarboxylic acid diglycidyl ester is used as a raw material, chain extension is firstly performed, an amine curing agent and the like are added to form an epoxy mixed solution, and then the epoxy mixed solution is compounded with inorganic fibers and cured and molded to obtain the wind power blade material.
Chain extension can be achieved by amine chain extenders, acid chain extenders or alcohol chain extenders, which are described below:
the reactants are as follows: 4, 5-Oxirane-1, 2-dicarboxylic acid diglycidyl ester, structural formula:
Figure BDA0003844076440000151
(C1) Chain extension is carried out by using an amine chain extender, and the reaction formula is as follows:
Figure BDA0003844076440000152
R 8 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000153
(C2) Carrying out chain extension reaction by using an acid chain extender:
Figure BDA0003844076440000154
R 9 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000161
(C3) Chain extension reaction by using an alcohol chain extender:
Figure BDA0003844076440000162
R 10 phenyl, cycloalkyl, alkyl, and the like.
The product after chain extension reacts with an amine curing agent to form an epoxy cured product, and the reaction formula is as follows:
Figure BDA0003844076440000163
the epoxy/fiber composite material can be recycled and utilized at low cost: crushing the epoxy/fiber composite material, adding ethylene glycol, mixing, reacting at high temperature, separating inorganic fiber from ethylene glycol solution, drying the inorganic fiber to obtain surface-modified inorganic fiber, and recycling the inorganic fiber in the composite material; concentrating the glycol filtrate, adding NaOH solution, heating, adding 12mol/L concentrated hydrochloric acid solution, cooling to room temperature, filtering, rectifying the filtrate to separate out glycol and water, wherein the rest substance is nitrogen-containing polyol which can be used as a flame retardant additive; drying insoluble substances generated by filtering, wherein the main components of the insoluble substances are dibasic acid and part of NaCl. Mixing the dried insoluble substances with epichlorohydrin and benzyl ammonium chloride, heating for reflux reaction, cooling, and filtering to remove insoluble NaCl; and adding NaOH solution into the filtrate, reacting, separating liquid to remove a lower-layer water phase, heating an upper-layer organic phase to 117 ℃ to remove epoxy chloropropane, obtaining the glycidyl ester with low molecular weight, and realizing the complete recovery and cyclic utilization of the epoxy resin.
Experimental data:
1. curing of the tetrahydrophthalic acid glycidyl ester epoxy resin with isophorone diamine (epoxy composition) under the following curing conditions: standing the mixture product for 24h, and curing at 80 ℃ for 6h;
(1) Mechanical properties of the epoxy composition body:
Figure BDA0003844076440000171
Figure BDA0003844076440000181
Figure BDA0003844076440000182
Figure BDA0003844076440000191
(2) The heat resistance is shown in FIG. 1.
2. Epoxy composition + glass fiber cloth (FRP panel): (1) Mechanical properties
Figure BDA0003844076440000201
Figure BDA0003844076440000211
Figure BDA0003844076440000212
Figure BDA0003844076440000221

Claims (8)

1. The epoxy fiber composite material for the wind power blade is characterized by comprising 10-30 parts by weight of cured epoxy resin and 70-90 parts by weight of inorganic fiber,
the inorganic fiber comprises any one of glass fiber, carbon fiber and basalt fiber;
the epoxy resin cured product comprises any one of the following compounds:
Figure FDA0003844076430000011
Figure FDA0003844076430000021
Figure FDA0003844076430000031
said R is 1 Is phenyl, cycloalkyl or alkyl;
the R is 2 Is phenyl, cycloalkyl or alkyl;
said R is 3 Is phenyl, cycloalkyl or alkyl;
said R is 4 Is phenyl, cycloalkyl or alkyl;
the R is 5 Is phenyl, cycloalkyl or alkyl;
the R is 6 Is phenyl, cycloalkyl or alkyl;
the R is 7 Is phenyl, cycloalkyl or alkyl;
said R is 8 Is phenyl, cycloalkyl or alkyl;
the R is 9 Is phenylCycloalkyl or alkyl;
the R is 10 Is phenyl, cycloalkyl or alkyl.
2. The epoxy fiber composite material for the wind power blade according to claim 1, wherein the cured epoxy resin is obtained by reacting glycidyl ester type epoxy resin with an amine curing agent;
the glycidyl ester type epoxy resin is obtained by mixing and reacting 80-98 wt% of low molecular weight glycidyl ester type epoxy resin and 2-20 wt% of chain extension modifier;
the low molecular weight glycidyl ester type epoxy resin is tetrahydrophthalic acid glycidyl ester, hexahydrophthalic acid glycidyl ester or 4, 5-epoxy hexane-1, 2-dicarboxylic acid diglycidyl ester,
the chain extension modifier is any one of an amine chain extender, an acid chain extender and an alcohol chain extender.
3. The epoxy fiber composite material for a wind blade according to claim 2, wherein the inorganic fiber includes at least two of glass fiber, carbon fiber, basalt fiber;
the amine curing agent comprises any one of isophorone diamine, triethylene tetramine and 4, 4-diamino diphenyl sulfone.
4. The preparation method of the epoxy fiber composite material for the wind power blade is characterized by comprising the following steps of:
(1) Preparation of glycidyl ester type epoxy resin: mixing low-molecular-weight glycidyl ester type epoxy resin with a chain extension modifier, and reacting to combine the low-molecular-weight glycidyl ester type epoxy resin with a chain extension into high-molecular-weight glycidyl ester type epoxy resin molecules;
the low molecular weight glycidyl ester type epoxy resin is any one of tetrahydrophthalic acid glycidyl ester, hexahydrophthalic acid glycidyl ester and 4, 5-epoxy hexane-1, 2-dicarboxylic acid diglycidyl ester, and the chain extension modifier is an amine chain extender, an acid chain extender or an alcohol chain extender;
(2) Preparation of epoxy resin composition: uniformly mixing the glycidyl ester type epoxy resin prepared in the step (1) with an amine curing agent at room temperature to obtain an epoxy resin composition;
(3) And (3) impregnating inorganic fibers with the epoxy resin composition, and drying to obtain the epoxy composite material for the wind power blade.
5. The method for preparing the epoxy fiber composite material for the wind power blade according to claim 4,
in the step (1), the viscosity of the mixture is controlled within the range of 3000-5000 mPa.s;
in the step (2), the viscosity of the mixture is controlled within the range of 200-300mPa.s.
6. The preparation method of the epoxy fiber composite material for the wind power blade as claimed in claim 4, wherein the step (3) is: and (3) impregnating the inorganic fiber with the epoxy resin composition under the air pressure of 0.01-0.02 Mpa, standing under the air pressure of more than 0.2Mpa, and drying to obtain the epoxy composite material for the wind power blade.
7. The preparation method of the epoxy fiber composite material for the wind turbine blade as claimed in claim 4, wherein in the step (1), the low molecular weight glycidyl ester type epoxy resin is mixed according to a mixture ratio of 80wt% -98 wt% and the chain extension modifier is mixed according to a mixture ratio of 2wt% -20 wt%.
8. The method for preparing the epoxy fiber composite material for the wind power blade according to claim 4, wherein the amine curing agent comprises any one of isophorone diamine, triethylene tetramine, and 4, 4-diamino diphenyl sulfone.
CN202211111979.0A 2022-07-26 2022-09-14 Epoxy fiber composite material for wind power blade and preparation method thereof Pending CN115678204A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116731288A (en) * 2023-07-19 2023-09-12 武汉纺织大学 Epoxy glass polymer containing dynamic ester bonds, glass fiber cloth laminated board and preparation method and application thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116731288A (en) * 2023-07-19 2023-09-12 武汉纺织大学 Epoxy glass polymer containing dynamic ester bonds, glass fiber cloth laminated board and preparation method and application thereof

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