Method for enhancing interface performance between wedge block and resin and blade root component

Abstract

The invention discloses a method for enhancing interface performance between a wedge block and resin and a blade root component. The method comprises the following steps: providing a silane coupling agent solution; carrying out surface modification treatment on the wedge-shaped block by using a silane coupling agent solution, so that the wedge-shaped block and a silane coupling agent form hydrogen bonds and covalent bonds, and obtaining a silane coupling agent modified wedge-shaped block; resin is poured into the peripheral side of the wedge-shaped block modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form covalent bonds, and the interface performance between the wedge-shaped block and the resin is enhanced. According to the method for enhancing the interface performance between the wedge-shaped block and the resin, the silane coupling agent solution is used for carrying out surface modification treatment on the wedge-shaped block, so that the wedge-shaped block and the silane coupling agent form hydrogen bonds and covalent bonds, chemical groups on the surface of the wedge-shaped block are changed, the silane coupling agent and the resin react to form the covalent bonds, and the interface performance between the wedge-shaped block and the resin is enhanced. And the bonding capacity between the wedge-shaped block and the resin matrix is improved, namely the interface performance between the wedge-shaped block and the resin is improved, and the load bearing capacity of the prefabricated blade root component is enhanced.

Description

Technical Field

[0001] The present application belongs to the technical field of wind turbine blades, and in particular relates to a method for enhancing the interface performance between a wedge block and a resin, and a blade root component. Background Art

[0002] Wind energy is a clean, renewable energy source that produces almost no greenhouse gas emissions and other pollutants during its use, meeting global requirements for addressing climate change and reducing carbon footprints. In existing wind turbine blades, the pre-embedded blade root molding process is to form a prefabricated blade root component by infusing resin and curing the pre-pultruded fiberglass UD wedge block with a metal bolt sleeve, a PET wedge block and a glass fiber cloth. The UD wedge block is mainly made of thermosetting epoxy resin or vinyl resin and fiber yarn through a pultrusion process, and then the surface is roughened by processes such as surface sandblasting or grinding.

[0003] As the trend of wind turbine blades becoming larger and larger, the load on the root of super-large blades is also increasing, and the static safety margin is approaching the limit of the material. The interface performance between the UD wedge block and the resin directly affects the load level of the blade root, and the surface sandblasting process has affected the improvement of the interface performance between the UD wedge block and the resin. Therefore, it is urgent to develop a method for enhancing the interface performance between the wedge block and the resin material at the root of the wind turbine blade to increase the load on the blade root. Summary of the invention

[0004] The embodiment of the present application provides a method for enhancing the interface performance between a wedge block and a resin, which can improve the interface performance between the wedge block and the resin and enhance the load bearing capacity of a prefabricated blade root component.

[0005] In a first aspect, the present application provides a method for enhancing the interface performance between a wedge block and a resin, comprising: providing a silane coupling agent solution; performing surface modification treatment on the wedge block using the silane coupling agent solution to form a hydrogen bond or a covalent bond between the wedge block and the silane coupling agent, thereby obtaining a wedge block modified by the silane coupling agent; and injecting a resin around the silane coupling agent-modified wedge block to react the silane coupling agent with the resin to form a covalent bond, thereby enhancing the interface performance between the wedge block and the resin.

[0006] The method for enhancing the interface performance between the wedge block and the resin in the embodiment of the present application uses a silane coupling agent solution to perform surface modification treatment on the wedge block, so that the surface of the wedge block forms hydrogen bonds and covalent bonds with the silane coupling agent, changes the chemical groups on the surface of the wedge block, and allows the silane coupling agent to react with the resin to form covalent bonds, thereby improving the interface performance between the wedge block and the resin, and enhancing the bonding performance between the wedge block and the resin matrix, thereby enhancing the load-bearing capacity of the prefabricated blade root component.

[0007] According to an embodiment of the first aspect of the present application, the molecular structural formula of the silane coupling agent in the silane coupling agent solution used is:

[0008] YR-SiX3 (1),

[0009] In formula (1), X is a C1-C2 alkoxy group, an acyloxy group, or chlorine; R is selected from a C1-C3 alkyl group or a phenyl group; Y is an organic functional group; wherein Y is selected from a mercapto group, a polysulfide group, an amino group, a modified amino group, a vinyl group, an epoxy group, a cyano group, an isocyanate group, a methacryloxy group, or a glycidyloxy group.

[0010] According to an embodiment of the first aspect of the present application, Y is selected from amino, modified amino, epoxy, and vinyl.

[0011] According to an embodiment of the first aspect of the present application, the silane coupling agent is selected from 3-acetoxypropyltrimethoxysilane, KH560, KH570 or a combination thereof.

[0012] According to an embodiment of the first aspect of the present application, the solvent used to prepare the silane coupling agent solution is selected from water, methanol, ethanol, propanol, butanol, pentanol, hexanol or a combination thereof.

[0013] According to an embodiment of the first aspect of the present application, the concentration of the silane coupling agent solution is 5 Vol% to 25 Vol%.

[0014] According to an embodiment of the first aspect of the present application, using a silane coupling agent solution to perform surface modification treatment on the wedge block includes: coating the surface of the wedge block with the silane coupling agent solution by any method of spraying or infiltration to perform surface modification treatment.

[0015] According to an embodiment of the first aspect of the present application, the time for performing surface modification treatment on the wedge block using the silane coupling agent solution is 0 hours to 4 hours.

[0016] According to an embodiment of the first aspect of the present application, after the wedge-shaped block is surface-treated with a silane coupling agent solution, the temperature for drying the wedge-shaped block surface-modified with the silane coupling agent is 30° C. to 120° C.

[0017] According to an embodiment of the first aspect of the present application, before using the silane coupling agent solution to perform surface modification treatment on the wedge block, the method further includes: performing surface polishing treatment on the wedge block so that the wedge block meets the surface roughness requirement.

[0018] According to an embodiment of the first aspect of the present application, the surface roughness of the wedge block that has undergone surface grinding is Ral3±0.5.

[0019] According to an embodiment of the first aspect of the present application, the wedge block is selected from epoxy fiberglass or vinyl fiberglass.

[0020] In the second aspect, the present application provides a blade root component for making wind turbine blades; wherein the blade root component includes: a glass fiber fabric, which is laminated and connected from a first end and extends separately to a second end away from the first end to form a accommodating cavity with a gradually increasing opening; and a second wedge block, a first wedge block, and a metal bolt sleeve are sequentially arranged in the accommodating cavity in a direction from the first end to the second end; the second wedge block fills the accommodating cavity near the first end and is connected to the separate glass fiber fabric; the first surface of the first wedge block is connected to the second wedge block, and the second surface of the first wedge block is contact-connected with the metal bolt sleeve, and a resin connecting part that contains the yarn and connects the first wedge block and the metal bolt sleeve is arranged in an area where the first wedge block and the metal bolt sleeve are not in contact, and a silane coupling agent connecting layer is formed from the resin connecting part to the second surface of the first wedge block.

[0021] The method for enhancing the interface performance between the wedge block and the resin in the embodiment of the present application uses a silane coupling agent solution to perform surface modification treatment on the wedge block, so that the surface of the wedge block forms hydrogen bonds and covalent bonds with the silane coupling agent, and the chemical groups on the surface of the wedge block are changed, so that the silane coupling agent reacts with the resin to form covalent bonds, thereby improving the bonding performance between the wedge block and the resin matrix, that is, improving the interface performance between the wedge block and the resin, thereby enhancing the load-bearing capacity of the prefabricated blade root component. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] Figure 1 It is a schematic flow chart of a method for enhancing the interface performance between a wedge block at the root of a wind turbine blade and a resin provided in an embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of a blade root component provided in an embodiment of the present application;

[0025] Figure 3 It is a schematic diagram of the principle of enhancing the interface performance between the wedge block and the resin in the embodiment of the present application.

[0026] Explanation of the accompanying drawings: 1. yarn; 2. first wedge block; 2a. first surface; 2b. second surface; 3. second wedge block; 4. glass fiber fabric; 4a. first end; 4b. second end; 5. metal bolt sleeve; 7. silane coupling agent; 8. silane coupling agent connecting layer; 9. accommodating cavity; 10. resin connecting part; T. thickness direction of the wedge block; L. length direction of the wedge block. DETAILED DESCRIPTION

[0027] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by illustrating the examples of the present application.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0029] As described in the background technology section, the existing wedge block surface sandblasting process has caused the interface performance between the wedge block and the resin to reach its limit, which affects the improvement of the interface performance between the wedge block and the resin.

[0030] In order to solve the problems of the prior art, the embodiments of the present application provide a method for enhancing the interface performance between a wedge block and a resin and a blade root component. The method for enhancing the interface performance between a wedge block and a resin provided by the embodiments of the present application is first introduced below.

[0031] The inventors of the present application have discovered that a silane coupling agent is a special organosilicon compound whose molecular structure contains at least two different types of active groups. One type of group is organophilic and can react with organic materials such as polymers or has good compatibility; the other type of group is inorganic and can form strong chemical bonds with the surface of inorganic materials.

[0032] After hydrolysis, the silane coupling agent generates -Si-OH, and the polar group of the wedge block made of glass fiber reinforced plastic forms a hydrogen bond or a covalent bond with the terminal hydroxyl group of the silane coupling agent at room temperature or after heating. At the same time, the other end of the silane coupling agent reacts with the epoxy resin, so that the interface of the silane coupling agent and the epoxy resin is connected in the form of a chemical bond, and a bridge is built on the interface between the inorganic material and the organic polymer material, thereby enhancing the interface performance between the wedge block and the resin.

[0033] Figure 1 A schematic flow chart of a method for enhancing the interface performance between a wedge block and a resin provided in one embodiment of the present application is shown.

[0034] like Figure 1 As shown, the method for enhancing the interface performance between the wedge block and the resin includes: providing a silane coupling agent solution; using the silane coupling agent solution to perform surface modification treatment on the wedge block, so that hydrogen bonds or covalent bonds are formed between the wedge block and the silane coupling agent, thereby obtaining a wedge block modified by the silane coupling agent; and injecting resin around the silane coupling agent-modified wedge block, so that the silane coupling agent reacts with the resin to form covalent bonds, thereby enhancing the interface performance between the wedge block and the resin.

[0035] The method for enhancing the interface performance between the wedge block and the resin in the embodiment of the present application uses a silane coupling agent solution to perform surface modification treatment on the wedge block, so that the surface of the wedge block forms hydrogen bonds and covalent bonds with the silane coupling agent, changes the chemical groups on the surface of the wedge block, and allows the silane coupling agent to react with the resin to form covalent bonds, thereby improving the interface performance between the wedge block and the resin, and enhancing the bonding performance between the wedge block and the resin matrix, thereby enhancing the load-bearing capacity of the prefabricated blade root component.

[0036] In some embodiments of the present application, the molecular structure of the silane coupling agent in the silane coupling agent solution used is:

[0037] YR-SiX3 (1),

[0038] In formula (1), X is a C1-C2 alkoxy group, an acyloxy group, or chlorine; R is selected from a C1-C3 alkyl group or a phenyl group; Y is an organic functional group; wherein Y is selected from a mercapto group, a polysulfide group, an amino group, a modified amino group, a vinyl group, an epoxy group, a cyano group, an isocyanate group, a methacryloxy group, or a glycidyloxy group.

[0039] In an embodiment of the present application, the load of the blade root embedded part, i.e., the blade root component, is increased based on the principle of interface enhancement. A silane coupling agent is used as an interface enhancer to treat the surface of the wedge block material. The silanization principle of the surface of the wedge block made of fiberglass is utilized to enhance the interface bonding between the wedge block and the injected resin through hydrogen bonds and chemical bonds.

[0040] In the embodiments of the present application, Figure 3As shown, after the surface of the wedge block is surface-modified with a silane coupling agent solution, the X group contained in the silane coupling agent 7 is hydrolyzed to generate -Si-OH, and the polar group (such as -OH) on the surface of the wedge block made of glass fiber reinforced plastic forms a covalent bond with -Si-OH at room temperature or after heating treatment, and the H atom contained in the silane coupling agent forms a hydrogen bond with the O and N atoms contained in the surface group of the wedge block, thereby enhancing the connection strength between the wedge block and the silane coupling agent. After the resin is poured into the peripheral side of the wedge block modified by the silane coupling agent, the Y group contained in the silane coupling structure reacts with the epoxy group in the resin to form a covalent bond to form a silane coupling agent connection layer, thereby improving the interface performance between the wedge block and the resin and enhancing the load bearing capacity of the prefabricated blade root component containing it. Figure 3 In the above, R1 represents the epoxy resin molecular chain connecting the epoxy groups.

[0041] In some embodiments of the present application, Y is selected from amino, modified amino, epoxy, and vinyl groups, and the silane coupling agent having the above groups can improve the connection strength with the epoxy resin.

[0042] In some embodiments of the present application, the silane coupling agent used to provide the silane coupling agent solution is selected from 3-acetoxypropyltrimethoxysilane, KH560, KH570 or a combination thereof.

[0043] In some embodiments of the present application, the concentration of the silane coupling agent solution is 5Vol% to 25Vol%. Wherein, Vol% is a volume percentage, indicating the proportion of the volume of the silane coupling agent as a solute to the total volume of the silane coupling agent solution. Exemplarily, the concentration of the silane coupling agent solution is 5.5Vol%, 6Vol%, 7Vol%, 7.5Vol%, 8Vol%, 9Vol%, 10Vol%, 12Vol%, 14Vol%, 15Vol%, 17Vol%, 18Vol%, 19Vol%, 20Vol%, 21Vol%, 22Vol%, 24Vol%, 24.5Vol%.

[0044] In some embodiments of the present application, the solvent used to prepare the silane coupling agent solution is selected from water, methanol, ethanol, propanol, butanol, pentanol, hexanol or a combination thereof.

[0045] In some embodiments of the present application, using a silane coupling agent solution to perform surface modification on the wedge block includes: coating the surface of the wedge block with the silane coupling agent solution by spraying or dipping to perform surface modification.

[0046] In some embodiments of the present application, the time for surface treatment of the wedge block using the silane coupling agent solution is 0 hours to 4 hours. Preferably, the treatment time is 0 hours to 1 hour. Exemplarily, the time for surface treatment of the wedge block using the silane coupling agent solution is 0.5 hours, 0.6 hours, 0.75 hours, 0.8 hours, 0.9 hours, 1 hour, 1.2 hours, 1.5 hours, 1.8 hours, 2 hours, 2.5 hours, 3 hours, 3.6 hours, 4 hours.

[0047] In some embodiments of the present application, the temperature for drying the wedge-shaped block surface-modified by the silane coupling agent solution is 30° C. to 120° C. Preferably, the temperature for drying is 50° C. to 100° C. Exemplarily, the temperature for drying the wedge-shaped block surface-modified by the silane coupling agent solution is 32° C., 34° C., 35° C., 38° C., 39° C., 40° C., 43° C., 45° C., 48° C., 50° C., 51° C., 53° C., 54° C., 56° C., 59° C., 60° C., 64° C., 66° C., 68° C., 70° C., 72° C., 75° C., 78° C., 80° C., 84° C., 85° C., 86° C., 88° C., 90° C., 92° C., 93° C., 94° C., 96° C., 98° C., 100° C., 104° C., 106° C., 108° C., 110° C., 112° C., 113° C., 115° C., 118° C., 119° C. The above drying temperature can quickly and effectively remove the solvent in the silane coupling agent solution.

[0048] In some embodiments of the present application, before using the silane coupling agent solution to perform surface modification treatment on the wedge block, the process further includes: performing surface polishing treatment on the wedge block.

[0049] In some embodiments of the present application, the surface roughness of the wedge-shaped block subjected to surface grinding is Ral3±0.5. The surface roughness can be measured by the standard test method of GB / T 1031-2009.

[0050] In an embodiment of the present application, a wedge block made of epoxy fiberglass or vinyl fiberglass that has been surface-polished is surface-modified using a silane coupling agent solution. The silane coupling agent can effectively enhance the bonding performance between the wedge block and the resin. In combination with the surface polishing process, the bonding performance between the wedge block and the resin can be further enhanced, thereby further improving the interface performance between the wedge block surface and the resin, thereby increasing the load of the blade root component.

[0051] In some embodiments of the present application, the wedge block is selected from epoxy fiberglass or vinyl fiberglass.

[0052] The method for enhancing the interface performance between the wedge block and the resin in the embodiment of the present application is based on the interface enhancing material of silane coupling agent, which can effectively improve the interface performance between the wedge block and the resin, thereby achieving the purpose of improving the bearing capacity of the blade root component. In addition to being used to enhance the prefabricated blade root component, the interface performance enhancement method of the present application can also be extended to the connection between the pultruded main beam and the segmented blade, and the strengthening requirements of key components can be improved through interface bonding.

[0053] In a second aspect, the present application provides a blade root component for manufacturing a wind turbine blade. Figure 2 As shown, the blade root component includes: a glass fiber fabric 4, which is laminated and connected from the first end 4a and extends to the second end 4b away from the first end 4a and is separately arranged to form an accommodating cavity 9 with a gradually increasing opening; and a second wedge block 3, a first wedge block 2, and a metal bolt sleeve 5 are sequentially arranged in the accommodating cavity 9 from the first end 4a to the second end 4b; the second wedge block 3 fills the accommodating cavity 9 near the first end 4a and is connected to the separate glass fiber fabric 4; the first surface 2a of the first wedge block 2 is connected to the second wedge block 3, and the second surface 2b of the first wedge block 2 is contact-connected with the metal bolt sleeve 5; the first wedge block 2 and the metal bolt sleeve 5 are provided with a resin connecting part 10 containing the yarn 1 and connecting the first wedge block 2 and the metal bolt sleeve 5 in the non-contact-connected area, and a silane coupling agent connecting layer 8 is formed from the resin connecting part 10 to the second surface of the first wedge block 2.

[0054] In an embodiment of the present application, since the first wedge block 2 is surface-modified using a silane coupling agent through the above-mentioned method for enhancing the interface performance between the wedge block and the resin, a silane coupling agent connecting layer 8 is formed between the second surface 2b of the first wedge block and the resin connecting portion 10, which effectively enhances the interface performance between the first wedge block and the resin, thereby enhancing the load-bearing capacity of the blade root component including the first wedge block 2, the silane coupling agent connecting layer 8 and the resin connecting portion 10.

[0055] In the embodiment of the present application, the first wedge block 2 is the wedge block in the method for enhancing the interface performance between the wedge block and the resin, which is made of thermosetting epoxy resin or vinyl resin and fiber yarn through a pultrusion process.

[0056] In some embodiments, optionally, the surface of the metal bolt sleeve 5 is also subjected to surface modification treatment with a silane coupling agent solution to have a suitable roughness to enhance the connection strength with the resin connection portion 10 .

[0057] In the embodiment of the present application, the resin poured between the first wedge block 2 and the glass fiber fabric 4 and between the first wedge block 2 and the metal bolt sleeve 5 is a two-component epoxy resin system to form a resin connection portion 10. The main agent in the two-component epoxy resin system is epoxy resin, and the curing agent is at least one of aliphatic amine, alicyclic amine or aromatic amine. The second wedge block 3 is a foam wedge block, which can be made of PET material.

[0058] Exemplarily, the aliphatic amine is selected from hexylene diamine, diethylene triamine, triethylene tetramine, tetraethylene pentamine, polyether amine, polyamide or a combination thereof, and the alicyclic amine is selected from methyltetrahydro-o-phenylenediamine, cyclohexylmethane diamine, 1,3-bis(N-aminomethyl)cyclohexane, dicyclohexylmethane diamine, isophorone diamine, 4,4'-diaminodicyclohexylmethane or a combination thereof. The aromatic amine is selected from phenylenediamine, phenylenediamine, 4,4'-diaminodibenzhydrylmethane, 4,4'-diaminodiphenyl sulfone, resorcinol diglycidyl ether or a combination thereof.

[0059] In some embodiments, the first surface 2a and the second surface 2b are two surfaces opposite to each other along the thickness direction T of the first wedge block 2, and the two sides of the first wedge block 2 along the length direction L are connected to the separate glass fiber fabric 4 by epoxy resin. The second wedge block 3 is a foam wedge block, which can be made of PET material. The yarn 1 is the glass fiber wound on the metal bolt sleeve 5.

[0060] The method for enhancing the interface performance between the wedge block and the resin of the present application is verified by specific examples and comparative examples.

[0061] like Figure 2 As shown, the method for enhancing the interface performance between the wedge block and the resin according to the embodiment of the present application can simultaneously enhance the interface strength between the yarn 1 and the wedge block 2, and between the glass fiber fabric 4 and the wedge block 2.

[0062] The wedge blocks used in Examples 1-2 and Comparative Examples 1-3 are made of epoxy fiberglass, the resin used is a general wind power infusion epoxy resin, the curing agent used is a mixture of hexamethylenediamine and cyclohexylmethanediamine in a mass ratio of 1:1, and the mass ratio of epoxy resin to curing agent is 100:30.

[0063] Example 1

[0064] A method for enhancing the interface performance between a wedge block and a resin comprises: providing a silane coupling agent solution, wherein the silane coupling agent is KH560, the solvent is water, and the concentration of the silane coupling agent is 5 Vol%; using the silane coupling agent solution to perform surface modification treatment on the wedge block, comprising immersing the wedge block having a surface roughness of Ra13±0.5 after surface sandblasting treatment in the silane coupling agent solution, then taking it out and drying it, wherein the drying treatment temperature is 30°C and the treatment time is 8 hours, so that a hydrogen bond or a covalent bond is formed between the wedge block and the silane coupling agent to obtain a wedge block modified by the silane coupling agent; and applying epoxy resin to the peripheral side of the wedge block modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form a covalent bond, thereby enhancing the interface performance between the wedge block and the resin.

[0065] Example 2

[0066] A method for enhancing the interface performance between a wedge block and a resin comprises: providing a silane coupling agent solution, wherein the silane coupling agent is KH570, the solvent is water, and the concentration of the silane coupling agent is 5 Vol%; using the silane coupling agent solution to perform surface modification treatment on the wedge block, comprising immersing the wedge block having a surface roughness of Ra13±0.5 after surface sandblasting treatment in the silane coupling agent solution, then taking it out and drying it, wherein the drying treatment temperature is 30°C and the treatment time is 8 hours, so that a hydrogen bond or a covalent bond is formed between the wedge block and the silane coupling agent to obtain a wedge block modified by the silane coupling agent; and applying epoxy resin to the peripheral side of the wedge block modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form a covalent bond, thereby enhancing the interface performance between the wedge block and the resin.

[0067] Comparative Example 1

[0068] A method for enhancing the interface performance between a wedge block and a resin comprises: connecting a wedge block having a surface roughness of Ra13±0.5 after sandblasting and polishing with the resin.

[0069] Comparative Example 2

[0070] A method for enhancing the interface performance between a wedge block and a resin comprises: providing a silane coupling agent solution, wherein the silane coupling agent is KH540, the solvent is water, and the concentration of the silane coupling agent is 5 Vol%; using the silane coupling agent solution to perform surface modification treatment on the wedge block, comprising immersing the wedge block having a surface roughness of Ra13±0.5 after surface sandblasting treatment in the silane coupling agent solution, then taking it out and drying it, wherein the drying treatment temperature is 30°C and the treatment time is 8 hours, so that a hydrogen bond or a covalent bond is formed between the wedge block and the silane coupling agent to obtain a wedge block modified by the silane coupling agent; and applying epoxy resin to the peripheral side of the wedge block modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form a covalent bond, thereby enhancing the interface performance between the wedge block and the resin.

[0071] Comparative Example 3

[0072] A method for enhancing the interface performance between a wedge block and a resin comprises: providing a silane coupling agent solution, wherein the silane coupling agent is KH550, the solvent is water, and the concentration of the silane coupling agent is 5 Vol%; using the silane coupling agent solution to perform surface modification treatment on the wedge block, comprising immersing the wedge block having a surface roughness of Ral3±0.5 after surface sandblasting and grinding in the silane coupling agent solution, then taking it out and drying it, wherein the drying treatment temperature is 30°C and the treatment time is 8 hours, so that a hydrogen bond or a covalent bond is formed between the wedge block and the silane coupling agent to obtain a wedge block modified by the silane coupling agent; and applying epoxy resin to the peripheral side of the wedge block modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form a covalent bond, thereby enhancing the interface performance between the wedge block and the resin.

[0073] Example 3

[0074] This embodiment provides a blade root component for manufacturing a wind turbine blade. Figure 2 As shown, the blade root component includes: a glass fiber fabric 4, which is laminated and connected from the first end 4a and extends to the second end 4b away from the first end 4a and is separately arranged to form an accommodating cavity 9 with a gradually increasing opening; and a second wedge block 3, a first wedge block 2, and a metal bolt sleeve 5 are sequentially arranged in the accommodating cavity 9 from the first end 4a to the second end 4b; the second wedge block 3 fills the accommodating cavity 9 near the first end 4a and is connected to the separate glass fiber fabric 4; the first surface 2a of the first wedge block 2 is connected to the second wedge block 3, and the second surface 2b of the first wedge block 2 is contact-connected with the metal bolt sleeve 5; the first wedge block 2 and the metal bolt sleeve 5 are provided with a resin connecting part 10 containing the yarn 1 and connecting the first wedge block 2 and the metal bolt sleeve 5 in the non-contact-connected area, and a silane coupling agent connecting layer 8 is formed from the resin connecting part 10 to the second surface of the first wedge block 2.

[0075] Test Section

[0076] The wedge-shaped blocks and epoxy resins at the roots of wind turbine blades of Examples 1-2 and Comparative Examples 1-3 were subjected to the following performance tests to evaluate the interface enhancement effect based on the tensile shear properties of the material level:

[0077] (1) Tensile shear strength

[0078] According to the standard BS EN 1465-2009, the shear strength performance test was performed on the wedge blocks and epoxy resin at the root of the wind turbine blade of Examples 1-4 and Comparative Example 1. The shear strength test results are recorded in the following Table 1:

[0079] Table 1

[0080]

[0081] It should be noted that the improvement in the tensile shear strength of Examples 1-2 and Comparative Examples 1-2 in Table 1 is calculated based on the tensile shear strength of Comparative Example 1, and “ / ” indicates that the test result does not exist.

[0082] like Figure 3 As shown, the test results show that: epoxy resin is poured into the gap between the yarn 1, the first wedge block 2 and the metal bolt sleeve 5 to form a blade root component. Under the action of the silane coupling agent 7, a silane coupling agent connecting layer 8 connected by the interface interaction of hydrogen bonds and chemical bonds is formed between the epoxy resin and the second surface 2b of the first wedge block 2. The silane coupling agent connecting layer 8 formed by this additional interaction force improves the interface performance between the first wedge block 2 and the resin connecting part, thereby achieving the purpose of enhancing the load-bearing capacity of the blade root component.

[0083] Figure 2 The structure diagram of the blade root component provided by the embodiment of the present application is shown. Figure 2 It can be seen from Table 1 that compared with the comparative example 1, the tensile shear strength of the first wedge block and the epoxy resin obtained by only sandblasting the surface of the first wedge block is only 23.59MPa. The tensile shear strength of the first wedge block and the epoxy resin obtained by the method of enhancing the interface performance between the wedge block and the resin of Examples 1 and 2 of the present application are improved. Among them, the tensile shear strength between the first wedge block and the epoxy resin of Examples 1 and 4 is increased by more than 36.63% compared with the tensile shear strength between the first wedge block and the epoxy resin of Comparative Example 1, and the highest increase is 54.39%, and the discrete coefficients are 3.79% and 9.68% respectively, which are in a reasonable range (generally ≤10%), indicating that the test data of the tensile shear strength are uniform, and it also proves that the interface performance of the first wedge block and the epoxy resin of Examples 1 and 4 after surface modification with silane coupling agent is improved more consistently. The shear strength between the first wedge block and the epoxy resin in Comparative Examples 2 and 3 is not much improved compared with Comparative Example 1, and the coefficient of dispersion also increases to a certain extent, indicating that the uniformity of the test data of the shear strength is slightly poor. The above results show that not all brands of silane coupling agents can improve the shear strength of the first wedge block (i.e., the fiberglass material of the blade root), and only some brands can improve the interface performance, thereby achieving the purpose of enhancing the load bearing capacity of the blade root component.

[0084] The above is only a specific implementation method of the present application. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present application is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application.

Claims

1. A method for enhancing the interface performance between a wedge block and a resin, characterized in that: include: Providing a silane coupling agent solution; Using the silane coupling agent solution to perform surface modification treatment on the wedge-shaped block, so that hydrogen bonds and covalent bonds are formed between the wedge-shaped block and the silane coupling agent, thereby obtaining a wedge-shaped block modified by the silane coupling agent; Resin is poured around the silane coupling agent-modified wedge block to react with the resin to form a covalent bond, thereby enhancing the interface performance between the wedge block and the resin.

2. The method for enhancing the interface performance between the wedge block and the resin according to claim 1, characterized in that: The molecular structural formula of the silane coupling agent in the silane coupling agent solution used is: YR-SiX3 (1), In formula (1), X is a C1-C2 alkoxy group, an acyloxy group, or chlorine; R is selected from a C1-C3 alkyl group or a phenyl group; Y is an organic functional group; wherein Y is selected from a mercapto group, a polysulfide group, an amino group, a modified amino group, a vinyl group, an epoxy group, a cyano group, an isocyanate group, a methacryloxy group, or a glycidyloxy group.

3. The method for enhancing the interface performance between a wedge block and a resin according to claim 1 or 2, characterized in that: The silane coupling agent used to provide the silane coupling agent solution is selected from 3-acetoxypropyltrimethoxysilane, KH560, KH570 or a combination thereof.

4. The method for enhancing the interface performance between the wedge block and the resin according to claim 3, characterized in that: Meet at least one of the following requirements: The concentration of the silane coupling agent solution is 5Vol% to 25Vol%; The solvent used to provide the silane coupling agent solution is selected from water, methanol, ethanol, propanol, butanol, pentanol, hexanol or a combination thereof.

5. The method for enhancing the interface performance between a wedge block and a resin according to claim 1, characterized in that: The surface modification treatment of the wedge block using the silane coupling agent solution includes: The silane coupling agent solution is coated on the surface of the wedge block by any method of spraying or immersion to perform surface modification treatment.

6. The method for enhancing the interface performance between a wedge block and a resin according to claim 1, characterized in that: The time for surface modification treatment of the wedge-shaped block by using the silane coupling agent solution is 0 to 4 hours, and the temperature for drying the wedge-shaped block surface modified by the silane coupling agent solution is 30° C. to 120° C.

7. The method for enhancing the interface performance between a wedge block and a resin according to claim 1, characterized in that: Before using the silane coupling agent solution to perform surface modification treatment on the wedge block, the method further includes: The wedge-shaped block is subjected to surface grinding.

8. The method for enhancing the interface performance between a wedge block and a resin according to claim 7, characterized in that: The surface roughness of the wedge block after surface grinding is Ra13±0.

5.

9. The method for enhancing the interface performance between a wedge block and a resin according to claim 1, characterized in that: The wedge-shaped block is selected from epoxy fiberglass or vinyl fiberglass.

10. A blade root component, used for manufacturing a wind turbine blade, characterized in that: The blade root component comprises: A glass fiber fabric (4) is laminated and connected from a first end and extends to a second end away from the first end and is separately arranged to form a receiving cavity (9) with a gradually increasing opening; and a second wedge block (3), a first wedge block (2), and a metal bolt sleeve (5) are sequentially arranged in the receiving cavity (9) in a direction from the first end to the second end; The second wedge-shaped block (3) is arranged in the accommodating cavity (9) near the first end and is connected to the separate glass fiber fabric (4); the first surface of the first wedge-shaped block (2) is connected to the second wedge-shaped block (3), and the second surface of the first wedge-shaped block (2) is in contact with and connected to the metal bolt sleeve (5); A resin connection portion (10) is provided in a non-contacting area between the first wedge block (2) and the metal bolt sleeve (5), which contains the yarn (1) and connects the first wedge block (2) and the metal bolt sleeve (5); and a silane coupling agent connection layer (8) is formed from the resin connection portion (10) to the second surface of the first wedge block (2).

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