Method for enhancing interface performance between metal bolt sleeve and resin and blade root component

Abstract

The invention discloses a method for enhancing the interface performance between a metal bolt sleeve and resin and a blade root component. The method comprises the following steps: providing a silane coupling agent solution; a silane coupling agent solution is used for carrying out surface modification treatment on the metal bolt sleeve, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and a silane coupling agent, and the silane coupling agent modified metal bolt sleeve is obtained; the resin is poured into the peripheral side of the metal bolt sleeve 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 metal bolt sleeve and the resin is enhanced. According to the method for enhancing the interface performance between the metal bolt sleeve and the resin, a silane coupling agent solution is used for carrying out surface modification treatment on the metal bolt sleeve, so that the metal bolt sleeve and a silane coupling agent form hydrogen bonds and covalent bonds, the silane coupling agent and the resin react to form the covalent bonds, and the interface bonding performance between the metal bolt sleeve and the resin is improved; and the static load and the fatigue load of the prefabricated blade root component are 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 metal bolt sleeve and a resin, and a blade root component. Background Art

[0002] As the global climate warms, wind energy, as an important form of renewable energy, is developing faster and faster. The rapid growth of the wind power industry has driven the continuous increase in wind turbine power and wind rotor blades. As the key core component of wind turbines to capture wind energy, blades lead the development direction of wind turbine power and large-scale. The existing blade root pre-embedded molding process usually requires sandblasting of the embedded bolt sleeve to roughen the surface of the embedded bolt sleeve, and then winds glass fiber around the embedded bolt sleeve, and then injects resin together with FRP UD wedge blocks, PET wedge blocks and glass fiber cloth to form a prefabricated blade root component. Through different sandblasting processes, the roughness of the metal bolt sleeve surface can be adjusted to improve the interface performance between the bolt sleeve and the resin.

[0003] However, facing the blade root load requirements of super-large blades, the load borne by the blade root is close to the limit of the existing pre-embedded bolt sleeve connection technology, and the surface sandblasting process also affects the performance improvement of the metal bolt sleeve and resin. Therefore, we continue to develop a material enhancement technology suitable for wind turbine blades to meet the high-load connection requirements of the pre-embedded bolt sleeve at the blade root. Summary of the invention

[0004] The embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and a resin, thereby improving the interface performance between the metal bolt sleeve and the resin and enhancing the static load and fatigue load of a prefabricated blade root component.

[0005] In a first aspect, the present application provides a method for enhancing the interfacial performance between a metal bolt sleeve and a resin, comprising: providing a silane coupling agent solution;

[0006] Using a silane coupling agent solution to perform surface modification treatment on the metal bolt sleeve, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, thereby obtaining a metal bolt sleeve modified by the silane coupling agent;

[0007] Resin is poured around the metal bolt sleeve modified by the silane coupling agent to make the silane coupling agent react with the resin to form a covalent bond, thereby enhancing the interface performance between the metal bolt sleeve and the resin.

[0008] 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 is provided as follows:

[0009] YR-SiX3 (14),

[0010] In formula (14), 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.

[0011] According to an embodiment of the first aspect of the present application, Y is selected from amino, modified amino, epoxy, and vinyl.

[0012] According to an embodiment of the first aspect of the present application, the silane coupling agent used in providing the silane coupling agent solution is selected from 3-acetoxypropyltrimethoxysilane, KH560, KH570 or a combination thereof.

[0013] According to an embodiment of the first aspect of the present application, the solvent used to provide the silane coupling agent solution is selected from water, methanol, ethanol, propanol, butanol, pentanol or a combination thereof.

[0014] According to an embodiment of the first aspect of the present application, the concentration of the silane coupling agent solution used to provide the silane coupling agent solution is 5 Vol% to 25 Vol%.

[0015] According to an embodiment of the first aspect of the present application, the pH value of the silane coupling agent solution used to provide the silane coupling agent solution is 1-6.

[0016] According to an embodiment of the first aspect of the present application, using a silane coupling agent solution to perform surface modification treatment on a metal bolt sleeve includes: coating the metal bolt sleeve with the silane coupling agent solution by any method of spraying or infiltration to perform surface modification treatment.

[0017] According to the embodiment of the first aspect of the present application, the time for surface modification of the metal bolt sleeve using the silane coupling agent solution is 0 hours to 4 hours, and the temperature for drying the metal bolt sleeve surface modified by the silane coupling agent solution is 30°C to 120°C, optionally 50°C to 100°C.

[0018] 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 metal bolt sleeve, the method further includes: performing surface polishing treatment on the metal bolt sleeve.

[0019] According to an embodiment of the first aspect of the present application, the surface roughness of the metal bolt sleeve after surface grinding is Ra5 to Ra18.

[0020] According to the embodiment of the first aspect of the present application, the material of the metal bolt sleeve is selected from conventional steel plate, 40Cr steel plate, and 42CrMo steel plate.

[0021] 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 to a second end away from the first end and is separately arranged 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 metal bolt sleeve is in contact with the second surface of the first wedge block and the glass fiber fabric; a resin connecting portion is arranged in an area where the metal bolt sleeve, the first wedge block and the glass fiber fabric are not in contact, the resin connecting portion contains the yarn, and connects the first wedge block, the glass fiber fabric and the metal bolt sleeve, and a silane coupling agent connecting layer is formed from the resin connecting portion to the surface of the metal bolt sleeve.

[0022] The method for enhancing the interface performance between the metal bolt sleeve and the resin in the embodiment of the present application uses a silane coupling agent solution to perform surface modification treatment on the metal bolt sleeve, so that the metal bolt sleeve and the silane coupling agent form hydrogen bonds and covalent bonds, the surface of the metal bolt sleeve is silanized or active grouped, and then the silane coupling agent reacts with the resin to form covalent bonds, and the bonding ability between the metal bolt sleeve and the resin matrix is ​​improved through hydrogen bonds and covalent bonds, that is, the interface bonding performance between the metal bolt sleeve and the resin is improved, and the static load and fatigue load of the prefabricated blade root component are enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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.

[0024] Figure 1 It is a flow chart of a method for enhancing the interface performance between a metal bolt sleeve and a resin at the root of a wind turbine blade provided in an embodiment of the present application.

[0025] Figure 2 It is a schematic diagram of the structure of the blade root component provided in an embodiment of the present application.

[0026] Figure 3 It is a schematic diagram of the method for enhancing the interface performance between the metal bolt sleeve and the resin at the root of a wind turbine blade according to an embodiment of the present application.

[0027] Explanation of the accompanying drawings: 1. yarn; 2. wedge block; 2a. first surface; 2b. second surface; , 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

[0028] 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.

[0029] 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.

[0030] The inventor of the present application has found that the bonding between the metal bolt sleeve and the epoxy resin matrix affects the performance of the prefabricated blade root component. Good and effective bonding means strong interface bonding. By modifying the surface of the metal bolt sleeve and changing the chemical groups on the surface of the bolt sleeve, the interface bonding between the metal bolt sleeve and the epoxy resin is improved. It is also beneficial to transfer stress between the metal bolt sleeve and the resin matrix, change the chemical groups on the surface of the metal bolt sleeve, and enhance the load bearing capacity of the prefabricated blade root component.

[0031] In order to solve the problems of the prior art, the embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and a resin. The method for enhancing the interface performance between a metal bolt sleeve and a resin provided by the embodiment of the present application is first introduced below.

[0032] Figure 1 A schematic flow chart of a method for enhancing the interface performance between a metal bolt sleeve and a resin provided in an embodiment of the present application is shown.

[0033] like Figure 1As shown, an embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and a resin, comprising: providing a silane coupling agent solution; using the silane coupling agent solution to perform surface modification treatment on the metal bolt sleeve, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, thereby obtaining a metal bolt sleeve modified by the silane coupling agent; and injecting resin around the silane coupling agent-modified metal bolt sleeve, so that the silane coupling agent reacts with the resin to form covalent bonds, thereby enhancing the interface performance between the metal bolt sleeve and the resin.

[0034] The method for enhancing the interface performance between the metal bolt sleeve and the resin in the embodiment of the present application uses a silane coupling agent solution to perform surface modification treatment on the metal bolt sleeve, so that the metal bolt sleeve and the silane coupling agent form hydrogen bonds and covalent bonds, and the chemical groups on the surface of the metal bolt sleeve are changed to silanize or active group the surface of the metal bolt sleeve, and then the silane coupling agent reacts with the resin to form covalent bonds, and the bonding ability between the metal bolt sleeve and the resin matrix is ​​improved through hydrogen bonds and covalent bonds, that is, the interface bonding performance between the metal bolt sleeve and the resin is improved, and the static load and fatigue load of the prefabricated blade root component are enhanced.

[0035] After hydrolysis, the silane coupling agent generates -Si-OH, and the polar surface of the metal bolt sleeve made of metal 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 metal bolt sleeve and the resin.

[0036] In the embodiment of the present application, based on the principle of interface enhancement, the load of the blade root embedded part, i.e., the blade root component, is increased. A silane coupling agent is used as an interface enhancer on the surface of the metal bolt sleeve for treatment. The metal bolt sleeve and the silane coupling agent are bonded through hydrogen bonds and chemical bonds, so that the metal surface of the metal bolt sleeve is silanized or active groups are formed, and the connection strength between the metal bolt sleeve and the silane coupling agent is improved. Then, the silane coupling agent reacts with the injected resin to enhance the interface bonding between the metal bolt sleeve and the resin. At the same time, the metal bolt sleeve and the resin connected by the functional group of the silane coupling agent are conducive to the transfer of stress between the metal bolt sleeve and the resin.

[0037] In some embodiments of the present application, the molecular structure of the silane coupling agent in the silane coupling agent solution is provided as follows:

[0038] YR-SiX3 (1),

[0039] 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.

[0040] Under the action of water, the silane coupling agent is hydrolyzed to produce -Si-OH, that is, the -Si-X group in the silane coupling agent of the structure shown in formula (1) becomes -Si-OH, which, as a polar group, forms a hydrogen bond or a covalent bond with the metal on the surface of the metal bolt sleeve. It is connected to the metal surface of the metal bolt sleeve through a hydrogen bond or a covalent bond at room temperature or after heating treatment; at the same time, the other end of the silane coupling agent molecule shown in formula (1) reacts with the epoxy resin, that is, the organic silicon carbon functional group represented by YR, Y represents a functional group, these functional groups can react with the epoxy, phenolic hydroxyl, amino, carbonyl and other organic functional groups in the matrix resin to form a covalent bond, realize a strong chemical bond, thereby establishing a connection between metal materials of different properties and the resin surface, and completing interface enhancement.

[0041] In the embodiments of the present application, Figure 3 As shown, after the surface of the metal bolt sleeve is subjected to surface modification treatment using a silane coupling agent solution, the X group contained in the silane coupling agent 7 is hydrolyzed to generate -Si-OH, and the polar surface of the metal bolt sleeve made of metal (which may contain -OH) forms a covalent bond with -Si-OH at room temperature or after heating treatment, and the H atoms contained in the silane coupling agent form a hydrogen bond connection with the O and N atoms contained in the surface groups of the metal bolt sleeve, thereby enhancing the connection strength between the metal bolt sleeve and the silane coupling agent; after the resin is poured into the peripheral side of the metal bolt sleeve 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 connection to form a silane coupling agent connection layer, thereby improving the interface bonding performance between the metal bolt sleeve and the resin, and enhancing the static load and fatigue load of the prefabricated blade root component containing it. Figure 3 In the above, R1 represents the epoxy resin molecular chain connecting the epoxy groups.

[0042] 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 between the metal bolt sleeve and the epoxy resin.

[0043] 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.

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

[0045] In some embodiments of the present application, the pH value of the silane coupling agent solution used to provide the silane coupling agent solution is 1 to 6. Exemplarily, the pH value of the silane coupling agent solution is 1.5, 1.8, 2, 2.5, 2.8, 3.0, 3.2, 3.5, 3.6, 4, 4.2, 4.5, 4.8, 5, 5.4, 5.5, 5.6, 5.8, 5.9, preferably, the pH value of the silane coupling agent solution is 3 to 6.

[0046] In the embodiments of the present application, a regulator can be used to adjust the pH value of the silane coupling agent solution to 1 to 6. By adjusting the pH value of the silane coupling agent solution to the above range, the silane coupling agent can be more fully connected to the surface of the metal bolt sleeve. The pH value of the silane coupling agent solution can be adjusted using an acid or base such as dilute hydrochloric acid, dilute sulfuric acid, dilute nitric acid, acetic acid, citric acid, sodium hydroxide, sodium bicarbonate, etc.

[0047] In some embodiments of the present application, the concentration of the silane coupling agent solution used in the silane coupling agent solution is 5Vo1% to 25Vo1%, wherein Vo1% is a volume percentage, indicating the ratio 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 5.3Vol%, 5.5Vol%, 5.8Vol%, 6Vol%, 6.45.5Vol%, 7Vol%, 7.2Vol%, 7.5Vol%, 8Vol%, 8.5Vol%, 9Vol%, 9.6Vol%, 10Vol%, 10.5Vol%, 11.5Vol%, 12Vol%, 12.4Vol%, 13.6Vol%, 14Vol%, 15Vol%, 17Vol%, 18Vol%, 19Vol%, 20Vol%, 21Vol%, 22Vol%, 24Vol%, 24.5Vol%.

[0048] In the embodiments of the present application, by developing interface enhancement technology, a silane coupling agent is used as an interface enhancer to perform surface modification on the surface of materials such as metal bolt sleeves, thereby achieving silanization or active groupization of the metal surface, and improving the interface bonding between the metal bolt sleeve and the infusion resin through chemical bonds such as hydrogen bonds and covalent bonds, thereby increasing the static load and fatigue load of the embedded blade root component.

[0049] In some embodiments of the present application, using a silane coupling agent solution to perform surface modification on a metal bolt sleeve includes: coating the metal bolt sleeve with the silane coupling agent solution by any method such as spraying or infiltration to perform surface modification so that the interface performance between the metal bolt sleeve and the resin is effectively enhanced.

[0050] In some embodiments of the present application, the time for surface treatment of the metal bolt sleeve using the silane coupling agent solution is 0 to 4 hours. Exemplarily, the time for surface treatment of the metal bolt sleeve 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. Preferably, the treatment time is 0 to 1 hour.

[0051] In some embodiments of the present application, the temperature for drying the metal bolt sleeve surface-modified by the silane coupling agent solution is 30° C. to 120° C. Exemplarily, the temperature for drying the metal bolt sleeve surface-treated 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. Preferably, the drying temperature is 50° C. to 100° C. The drying temperature can remove the solvent component in the silane coupling agent solution on the surface of the metal bolt sleeve.

[0052] In some embodiments of the present application, before using the silane coupling agent solution to perform surface modification treatment on the metal bolt sleeve, the process further includes: performing surface polishing treatment on the metal bolt sleeve.

[0053] In some embodiments of the present application, the surface roughness of the metal bolt sleeve after surface grinding is Ra5 to Ra 18. The surface roughness can be measured by the test method specified in GB / T 1031-2009.

[0054] In the embodiment of the present application, the conditions that need to be met for the sandblasting and grinding process of the metal bolt sleeve are: the sand material used is 10-60 mesh corundum, preferably 30-50 mesh corundum; the air pressure is 0.1MPa-1MPa, preferably 0.4MPa-0.6MPa.

[0055] In an embodiment of the present application, a silane coupling agent solution is used to perform surface modification treatment on the metal bolt sleeve that has completed the surface grinding treatment. On the basis of the silane coupling agent effectively enhancing the bonding performance between the metal bolt sleeve and the resin, combined with the surface grinding treatment process, the bonding performance between the metal bolt sleeve and the resin can be further enhanced, thereby further improving the interface performance between the metal bolt sleeve surface and the resin, thereby improving the static load and fatigue load of the blade root component.

[0056] In some embodiments of the present application, the material of the metal bolt sleeve is selected from conventional steel plate, 40Cr steel plate, and 42CrMo steel plate.

[0057] The method for enhancing the interface performance between the metal bolt sleeve and the resin in the embodiment of the present application is based on the interface enhancement technology of the silane coupling agent, which can improve the interface performance between the metal bolt sleeve and the resin, enhance the static load and fatigue load of the prefabricated blade root component, and achieve the purpose of improving the bearing capacity of the blade root. In addition to being used to enhance the blade root component, the interface enhancement technology can also be promoted and applied to the connection between the pultruded main beam and the segmented blade, and the strengthening technology of key components can be realized through interface bonding enhancement.

[0058] In the second aspect, the present application provides a blade root component for making wind turbine blades; the blade root component includes: a glass fiber fabric 4, which is laminated and connected from the first end and separately arranged toward the second end away from the first end, forming 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 in the direction from the first end to the second end; the second wedge block 3 fills 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 block 2 is connected to the second wedge block 3, and the metal bolt sleeve 5 is respectively contacted and connected with the second surface of the first wedge block 2 and the glass fiber fabric 4; a resin connecting portion 10 is set in the area where the metal bolt sleeve 5 is not in contact with the first wedge block 2 and the glass fiber fabric 4; the resin connecting portion 10 contains the yarn 1, and connects the first wedge block 2, the glass fiber fabric 4 and the metal bolt sleeve 5, and a silane coupling agent connecting layer 8 is formed from the resin connecting portion 10 to the surface of the metal bolt sleeve 5.

[0059] In the embodiment of the present application, since the metal bolt sleeve 5 is surface-modified using a silane coupling agent through the above-mentioned method of enhancing the interface performance between the metal bolt sleeve and the resin, a silane coupling agent connecting layer 8 is formed between the surface of the metal bolt sleeve and the resin connecting portion 10, which effectively enhances the interface performance between the metal bolt sleeve 5 and the resin, thereby enhancing the load-bearing capacity of the blade root component including the metal bolt sleeve 5, the silane coupling agent connecting layer 8 and the resin connecting portion 10.

[0060] In some embodiments of the present application, the first wedge block 2 is selected from epoxy fiberglass or vinyl fiberglass. In some embodiments, optionally, the surface of the wedge block is also subjected to the same silane coupling agent modification treatment as the surface modification treatment of the metal bolt sleeve.

[0061] In an embodiment of the present application, the resin injected into the non-contacting area 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 aliphatic amine or alicyclic amine or aromatic amine. Exemplarily, the aliphatic amine can be selected from hexamethylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polyetheramine, polyamide or a combination thereof, and the alicyclic amine can be selected from methyltetrahydro-o-phenylenediamine, cyclohexylmethanediamine, 1,3-bis(N-aminomethyl)cyclohexane, dicyclohexylmethanediamine, isophoronediamine, 4,4′-diaminodicyclohexylmethane or a combination thereof. The aromatic amine can be selected from phenylenediamine, phenylenediamine, 4,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylsulfone, resorcinol diglycidyl ether or a combination thereof.

[0062] 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.

[0063] In an embodiment of the present application, the blade root component is used to manufacture a wind turbine blade.

[0064] The method for enhancing the interface performance between the metal bolt sleeve and the resin at the root of a wind turbine blade of the present application is verified below through specific examples and comparative examples.

[0065] like Figure 2 As shown, the method for enhancing the interface performance between the metal bolt sleeve 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, the glass fiber fabric 4 and the wedge block 2, and the metal bolt sleeve 5 and the resin.

[0066] The metal bolt sleeve used in Example 1-2 and Comparative Example 1-3 is made of 42CrMo steel, the first wedge block used is made of epoxy fiberglass, the epoxy resin used is a general-purpose infusion epoxy resin for wind power, 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.

[0067] Example 1

[0068] The embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and a resin, comprising: providing a silane coupling agent solution, wherein the silane coupling agent is KH-560, the solvent is water, the concentration of the silane coupling agent in the silane coupling agent solution is 5Vo1%, and the pH value of the silane coupling agent solution is 3.2; using the silane coupling agent solution to perform surface modification treatment on the metal bolt sleeve, comprising immersing a metal bolt sleeve having a surface roughness of Ra6.3 to Ra12.5 after surface sandblasting treatment in the silane coupling agent solution, then taking it out and drying it, the drying treatment temperature is 30° C., and the treatment time is 8 hours, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, thereby obtaining a metal bolt sleeve modified by the silane coupling agent; and injecting resin into the circumference of the metal bolt sleeve modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form covalent bonds, thereby enhancing the interface performance between the metal bolt sleeve and the resin.

[0069] Example 2

[0070] The embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and a resin, comprising: providing a silane coupling agent solution, wherein the silane coupling agent is KH-570, the solvent is water, the concentration of the silane coupling agent in the silane coupling agent solution is 5Vo1%, and the pH value of the silane coupling agent solution is 3.2; using the silane coupling agent solution to perform surface modification treatment on the metal bolt sleeve, comprising immersing a metal bolt sleeve having a surface roughness of Ra6.3 to Ra12.5 after surface sandblasting treatment in the silane coupling agent solution, then taking it out and drying it, the drying treatment temperature is 30° C., and the treatment time is 8 hours, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, thereby obtaining a metal bolt sleeve modified by the silane coupling agent; and injecting resin into the circumference of the metal bolt sleeve modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form covalent bonds, thereby enhancing the interface performance between the metal bolt sleeve and the resin.

[0071] Comparative Example 1

[0072] An embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and a resin, comprising: connecting a metal bolt sleeve with a surface roughness of Ra6.3 to Ra12.5 treated with borax to a resin to enhance the interface performance between the metal bolt sleeve and the resin.

[0073] Comparative Example 2

[0074] The embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and a resin, comprising: providing a silane coupling agent solution, wherein the silane coupling agent is KH550, the solvent is water, the concentration of the silane coupling agent in the silane coupling agent solution is 5Vo1%, and the pH value of the silane coupling agent solution is 3.2; using the silane coupling agent solution to modify the metal bolt sleeve, comprising immersing a metal bolt sleeve having a surface roughness of Ra6.3 to Ra12.5 after surface sandblasting in the silane coupling agent solution, then taking it out and drying it, the drying temperature is 30° C., and the treatment time is 8 hours, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, thereby obtaining a metal bolt sleeve modified by the silane coupling agent; and injecting resin into the circumference of the metal bolt sleeve modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form covalent bonds, thereby enhancing the interface performance between the metal bolt sleeve and the resin.

[0075] Comparative Example 3

[0076] The embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and a resin, comprising: providing a silane coupling agent solution, wherein the silane coupling agent is KH-550, the solvent is water, the concentration of the silane coupling agent in the silane coupling agent solution is 5Vol%, and the pH value of the silane coupling agent solution is 3.2; using the silane coupling agent solution to modify the metal bolt sleeve, comprising immersing a metal bolt sleeve with a surface roughness of Ra6.3 to Ra12.5 after surface borax treatment in the silane coupling agent solution, then taking it out and drying it, the drying treatment temperature is 30° C., the treatment time is 8 hours, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, and a metal bolt sleeve modified by the silane coupling agent is obtained; and resin is poured around the metal bolt sleeve modified by the silane coupling agent, so that the silane coupling agent reacts with the resin to form covalent bonds, thereby enhancing the interface performance between the metal bolt sleeve and the resin.

[0077] Example 3

[0078] The present embodiment provides a blade root component for making a wind turbine blade; the blade root component includes: a glass fiber fabric 4, which is laminated and connected from a first end and is discretely arranged toward a second end away from the first end 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 which are sequentially arranged in the accommodating cavity 9 in a direction from the first end to the second end; the second wedge block 3 is filled in the accommodating cavity 9 near the first end and is connected to the discrete glass fiber fabric 4; the first surface of the first wedge block 2 is connected to the second wedge block 3, and the metal bolt sleeve 5 is contacted and connected to the second surface of the first wedge block 2 and the glass fiber fabric 4 respectively; a resin connecting portion 10 is provided in the non-contacting area between the metal bolt sleeve 5 and the first wedge block 2 and the glass fiber fabric 4; the resin connecting portion 10 contains the yarn 1, and connects the first wedge block 2, the glass fiber fabric 4 and the metal bolt sleeve 5, and a silane coupling agent connecting layer 8 is formed from the resin connecting portion 10 to the surface of the metal bolt sleeve 5.

[0079] Test Section

[0080] The following performance tests were performed between the metal bolt sleeves and the resin at the root of the wind turbine blades of Examples 1-2 and Comparative Examples 1-3 to evaluate the interface enhancement effect based on the tensile shear performance of the material level:

[0081] (1) Tensile shear strength

[0082] According to standard BESN1465-2009, the tensile shear strength performance test was performed between the metal bolt sleeve and the resin at the root of the wind turbine blade of Examples 1-2 and Comparative Examples 1-3.

[0083] The test results of tensile shear strength are recorded in the following Table 1:

[0084] Table 1

[0085]

[0086] It should be noted that the improvement in the tensile shear strength between the metal bolt sleeve and the resin at the root of the wind turbine blade in Examples 1-2 and Comparative Examples 2-3 in Table 1 is data calculated based on the tensile shear strength of Comparative Example 1.

[0087] The test results show that the resin is poured into the gap between the yarn 1, the first wedge block 2, the glass fiber fabric 4 and the metal bolt sleeve 5 to form a blade root component, such as Figure 3 As shown, 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 covalent bonds is formed between the epoxy resin and the metal bolt sleeve 5. The silane coupling agent connecting layer 8 formed by the additional interaction force improves the interface performance between the metal bolt sleeve 5 and the epoxy resin, thereby achieving the purpose of strengthening the blade root component.

[0088] Figure 2A schematic structural diagram of a blade root component provided in an embodiment of the present application is shown.

[0089] Combination Figure 2 As shown in Table 1, compared with the tensile shear strength between the metal bolt sleeve and the resin obtained by sandblasting the surface of the metal bolt sleeve 5 in Comparative Example 1, which is only 25.96MPa, the tensile shear strength between the metal bolt sleeve and the resin obtained by the method of enhancing the interface performance between the metal bolt sleeve and the resin in Examples 1-2 is improved. The tensile shear strength between the metal bolt sleeve and the resin obtained in Examples 1 and 2 is increased by 26.66% and 41.26% respectively compared with the tensile shear strength between the metal bolt sleeve and the resin in Comparative Example 1. The tensile shear strength between the metal bolt sleeve and the resin obtained in Comparative Example 2 and Comparative Example 3 is increased by 0.62% and 0.96% respectively compared with the tensile shear strength between the metal bolt sleeve and the resin in Comparative Example 1, and the increase is only less than 1%. The above results show that not all brands of silane coupling agents can improve the tensile shear strength between the bolt sleeve metal material and the epoxy resin of the blade root component, and only a few brands can play the role of improving the interface performance.

[0090] 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 metal bolt sleeve 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 metal bolt sleeve, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, thereby obtaining a metal bolt sleeve modified by the silane coupling agent; Resin is poured around the circumference of the metal bolt sleeve 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 metal bolt sleeve and the resin.

2. The method for enhancing the interface performance between the metal bolt sleeve 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 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 the metal bolt sleeve and the resin according to claim 1, characterized in that: Meet at least one of the following requirements: The silane coupling agent used in providing the silane coupling agent solution is selected from 3-acetoxypropyltrimethoxysilane, KH560, KH570 or a combination thereof; The solvent used to provide the silane coupling agent solution is selected from water, methanol, ethanol, propanol, butanol, pentanol or a combination thereof.

4. The method for enhancing the interface performance between a metal bolt sleeve and a resin according to any one of claims 1 to 3, characterized in that: The concentration of the silane coupling agent solution is 5 Vol% to 25 Vol%.

5. The method for enhancing the interface performance between a metal bolt sleeve and a resin according to any one of claims 1 to 3, characterized in that: The pH value of the silane coupling agent solution is 1-6.

6. The method for enhancing the interface performance between the metal bolt sleeve and the resin according to claim 1, characterized in that: Meet at least one of the following requirements: Using the silane coupling agent solution to perform surface modification treatment on the metal bolt sleeve includes: coating the metal bolt sleeve with the silane coupling agent solution by any one of spraying and immersion to perform surface modification treatment; The time for surface modification of the metal bolt sleeve using the silane coupling agent solution is 0 to 4 hours, and the temperature for drying the metal bolt sleeve surface modified by the silane coupling agent solution is 30 to 120°C, optionally 50 to 100°C.

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

8. The method for enhancing the interface performance between the metal bolt sleeve and the resin according to claim 7, characterized in that: The surface roughness of the metal bolt sleeve after surface grinding is Ra5 to Ra18.

9. The method for enhancing the interface performance between a metal bolt sleeve and a resin according to claim 1, characterized in that: The material of the metal bolt sleeve is selected from conventional steel plate, 40Cr steel plate and 42CrMo steel plate.

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 is separately arranged toward a second end away from the first end 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) in a direction from the first end to the second end; The second wedge-shaped block (3) is filled 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 metal bolt sleeve (5) is respectively in contact with the second surface of the first wedge-shaped block (2) and the glass fiber fabric (4); a resin connecting portion (10) is provided in the non-contacting area between the metal bolt sleeve (5), the first wedge-shaped block (2) and the glass fiber fabric (4); the resin connecting portion (10) contains the yarn (1) and connects the first wedge-shaped block (2), the glass fiber fabric (4) and the metal bolt sleeve (5), and a silane coupling agent connecting layer (8) is formed from the resin connecting portion (10) to the surface of the metal bolt sleeve (5).

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