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

Abstract

Disclosed in the present application are a method for enhancing the performance of an interface between a metal bolt sleeve and a resin, and a blade root component. The method comprises: providing a silane coupling agent solution; performing a surface modification treatment on a metal bolt sleeve by using the silane coupling agent solution so as to form hydrogen bonds and covalent bonds between the metal bolt sleeve and the silane coupling agent, thereby obtaining a silane-coupling-agent-modified metal bolt sleeve; and injecting a resin around the silane-coupling-agent-modified metal bolt sleeve, and reacting the silane coupling agent with the resin to form covalent bonds, thereby enhancing the performance of an interface between the metal bolt sleeve and the resin. In the method for enhancing the performance of an interface between a metal bolt sleeve and a resin, a silane coupling agent solution is used for performing a surface modification treatment on the metal bolt sleeve so as to enable the formation of hydrogen bonds and covalent bonds between the metal bolt sleeve and the silane coupling agent, and the silane coupling agent reacts with the resin to form covalent bonds, thereby improving the bonding performance of the interface between the metal bolt sleeve and the resin and enhancing the static load and fatigue load of a prefabricated blade root component.

Description

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

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese Patent Application No. 202411379272.7, filed on September 29, 2024, entitled “Method for enhancing interface performance between metal bolt sleeve and resin and blade root component,” the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application belongs to the technical field of wind turbine blades, and in particular relates to a method for enhancing interface performance between a metal bolt sleeve and resin and a blade root component. BACKGROUND

[0004] With the global warming, wind energy as an important form of renewable energy is developing faster and faster. The rapid growth of the wind power industry drives the continuous increase of wind turbine power and wind turbine 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-embedding forming process usually needs to perform sandblasting treatment on the pre-embedded bolt sleeve to perform surface roughening treatment, and then glass fibers are wound on the pre-embedded bolt sleeve, and the glass steel UD wedge block, PET wedge block and glass fiber cloth are together resin infusion and curing to form a prefabricated blade root component. Through different sandblasting processes, the roughness of the surface of the metal bolt sleeve can be adjusted to improve the interface performance between the bolt sleeve and the resin.

[0005] However, in the face of the load demand of the root of the super large blade, the load borne by the blade root part has approached 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 the resin. Therefore, a material enhancement technology suitable for wind turbine blades is continuously developed to meet the high bearing connection demand of the pre-embedded bolt sleeve of the blade root.

[0006] SUMMARY

[0007] The embodiments of the present application provide a method for enhancing the interface performance between a metal bolt sleeve and resin, improving the interface performance between the metal bolt sleeve and resin, and enhancing the static load and fatigue load of the prefabricated blade root component.

[0008] In a first aspect, the present application provides a method for enhancing the interface performance between a metal bolt sleeve and resin, comprising: providing a silane coupling agent solution;

[0009] The surface of the metal bolt sleeve is modified using the silane coupling agent solution to form hydrogen bonds and covalent bonds between the metal bolt sleeve and the silane coupling agent, thereby obtaining a silane coupling agent modified metal bolt sleeve;

[0010] The resin is poured on the side of the silane coupling agent modified metal bolt sleeve, the silane coupling agent reacts with the resin to form a covalent bond, and the interface performance between the metal bolt sleeve and the resin is enhanced.

[0011] According to the embodiments of the first aspect of the present application, the molecular structure of the silane coupling agent in the silane coupling agent solution is as follows: Y-R-SiX3 (1),

[0012] In formula (1), X is C1-C2 alkoxy, acyloxy, or chlorine, R is selected from C1-C3 alkyl or phenyl, Y is an organic functional group, wherein Y is selected from mercapto, polysulfide group, amino, modified amino, vinyl, epoxy, cyano, isocyanate, methacryloxy, and glycidyl ether oxy.

[0013] According to the embodiments of the first aspect of the present application, Y is selected from amino, modified amino, and epoxy.

[0014] According to the embodiments of the first aspect of the present application, the silane coupling agent used in the silane coupling agent solution is selected from 3-acetoxypropyltrimethoxysilane, KH560, KH570, or a combination thereof.

[0015] According to the embodiments of the first aspect of the present application, the solvent used in the silane coupling agent solution is selected from water, methanol, ethanol, propanol, butanol, pentanol, or a combination thereof.

[0016] According to the embodiments of the first aspect of the present application, the concentration of the silane coupling agent solution used in the silane coupling agent solution is 5Vol% to 25Vol%.

[0017] According to the embodiments of the first aspect of the present application, the pH value of the silane coupling agent solution used in the silane coupling agent solution is 1 to 6.

[0018] According to the embodiments of the first aspect of the present application, the surface modification treatment of the metal bolt sleeve using the silane coupling agent solution includes: coating the metal bolt sleeve with the silane coupling agent solution by any one of spraying and soaking, to perform the surface modification treatment.

[0019] According to the embodiments of the first aspect of the present application, the time for the surface modification treatment 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 subjected to the surface modification treatment using the silane coupling agent solution is 30°C to 120°C, which can be selected from 50°C to 100°C.

[0020] According to the embodiments of the first aspect of the present application, before the surface modification treatment of the metal bolt sleeve using the silane coupling agent solution, the metal bolt sleeve is further subjected to surface polishing treatment.

[0021] According to the embodiment of the first aspect of the present application, the surface roughness of the metal bolt sleeve after the surface polishing treatment is Ra5 to Ra18.

[0022] According to the embodiment of the first aspect of the present application, the material of the metal bolt sleeve is selected from a conventional steel plate, a 40Cr steel plate, and a 42CrMo steel plate.

[0023] In a second aspect, the present application provides a blade root component for manufacturing a wind turbine blade, wherein the blade root component comprises: a glass fabric layer connected in a stack from a first end to a second end away from the first end and arranged separately to form an accommodating cavity with an opening gradually increasing; and a second wedge-shaped block, a first wedge-shaped block, and a metal bolt sleeve arranged in the accommodating cavity in sequence from the first end to the second end; the second wedge-shaped block is filled in the accommodating cavity close to the first end and connected with the glass fabric layer; the first surface of the first wedge-shaped block is connected with the second wedge-shaped block, and the metal bolt sleeve is connected with the second surface of the first wedge-shaped block and the glass fabric layer; a resin connecting part is arranged in the area where the metal bolt sleeve is not connected with the first wedge-shaped block and the glass fabric layer, the resin connecting part contains yarns and connects the first wedge-shaped block, the glass fabric layer, and the metal bolt sleeve, and a silane coupling agent connecting layer is formed between the resin connecting part and the surface of the metal bolt sleeve.

[0024] 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 activated, and then the silane coupling agent reacts with the resin to form covalent bonds, so as to improve the bonding capacity between the metal bolt sleeve and the resin matrix, i.e., to improve the interface bonding performance between the metal bolt sleeve and the resin, and to enhance the static load and fatigue load of the prefabricated blade root component. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced as follows, and other drawings can also be obtained by those of ordinary skill in the art without creative labor on the basis of these drawings.

[0026] FIG. 1 is a flowchart of a method for enhancing the interface performance between a metal bolt sleeve and resin at the root of a wind turbine blade according to an embodiment of the present application.

[0027] FIG. 2 is a structural schematic diagram of a blade root component according to an embodiment of the present application.

[0028] FIG. 3 is a principle diagram of a method for enhancing the interface performance between a metal bolt sleeve and resin at the root of a wind turbine blade according to an embodiment of the present application.

[0029] Explanation of reference signs: 1, yarn; 2, wedge-shaped block; 2a, first surface; 2b, second surface; 3, second wedge-shaped block; 4, glass 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-shaped block; L, length direction of the wedge-shaped block. DETAILED DESCRIPTION

[0030] The features and exemplary embodiments of various aspects of the present application will be described below in detail, in order to make the purposes, technical solutions and advantages of the present application more clear and apparent, the present application will be further described in detail below in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, but not to limit the present application. The present application can be implemented without some of these specific details for those skilled in the art. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0031] It should be noted that, in this paper, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the elements defined by the statement "include" do not exclude the presence of other identical elements in the process, method, article or equipment including the elements.

[0032] The inventors of the present application found that the adhesion between the metal bolt sleeve and the epoxy resin matrix affects the performance of the prefabricated blade root part, and good and effective adhesion means strong interface bonding. By modifying the surface of the metal bolt sleeve, changing the chemical groups on the surface of the bolt sleeve, and improving the interface bonding between the metal bolt sleeve and the epoxy resin. It is also beneficial to the transfer of stress between the metal bolt sleeve and the resin matrix, changing the chemical groups on the surface of the metal bolt sleeve, and enhancing the load carrying capacity of the prefabricated blade root part.

[0033] In order to solve the problems in the prior art, the embodiments of the present application provide a method for enhancing the interface performance between the metal bolt sleeve and the resin. First, the method for enhancing the interface performance between the metal bolt sleeve and the resin provided by the embodiments of the present application will be introduced.

[0034] Fig. 1 shows a flowchart of a method for enhancing the interface performance between a metal bolt sleeve and resin according to an embodiment of the present application.

[0035] As shown in Fig. 1, the method for enhancing the interface performance between a metal bolt sleeve and resin according to an embodiment of the present application comprises the following steps: providing a silane coupling agent solution; performing surface modification treatment on the metal bolt sleeve using the silane coupling agent solution, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, thereby obtaining a silane coupling agent modified metal bolt sleeve; and pouring resin on the circumferential side of 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.

[0036] The method for enhancing the interface performance between a metal bolt sleeve and resin according to the embodiment of the present application performs surface modification treatment on the metal bolt sleeve using the silane coupling agent solution, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, the chemical groups on the surface of the metal bolt sleeve are changed, the surface of the metal bolt sleeve is silanized or activated, the silane coupling agent reacts with the resin to form covalent bonds, the adhesion between the metal bolt sleeve and the resin matrix is improved through hydrogen bonds and covalent bonds, 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.

[0037] The silane coupling agent generates -Si-OH after hydrolysis, and the polar surface of the metal bolt sleeve made of metal forms hydrogen bonds or covalent bonds with the terminal hydroxyl group of the silane coupling agent after normal temperature or heat treatment. Meanwhile, the other end of the silane coupling agent reacts with the epoxy resin, so that the interface between the silane coupling agent and the epoxy resin is connected in the form of chemical bonds, a bridge is built on the interface between inorganic materials and organic polymer materials, and the interface performance between the metal bolt sleeve and the resin is enhanced.

[0038] In the embodiment of the present application, the load of the blade root embedded part, i.e. the blade root component, is improved based on the interface enhancement principle. The surface of the metal bolt sleeve is treated using the silane coupling agent as an interface enhancer, the metal bolt sleeve and the silane coupling agent are combined through hydrogen bonds and chemical bonds, the surface of the metal bolt sleeve is silanized or activated, the connection strength between the metal bolt sleeve and the silane coupling agent is improved, the silane coupling agent reacts with the poured resin, and the interface bonding between the metal bolt sleeve and the resin is enhanced. Meanwhile, the metal bolt sleeve and the resin connected through the functional groups of the silane coupling agent are beneficial to the stress transfer between the metal bolt sleeve and the resin.

[0039] In some embodiments of the present application, the molecular structure of the silane coupling agent in the silane coupling agent solution is as follows:

[0040] In formula (1), X is C1-C2 alkoxy, acyloxy, chlorine, and R is selected from C1-C3 alkyl, phenyl; Y is an organic functional group; wherein Y is selected from mercapto, polysulfide group, amino, modified amino, vinyl, epoxy, cyano, isocyanate, methacryloxy, glycidyl ether.

[0041] Under the action of water, the silane coupling agent is hydrolyzed to produce -Si-OH, i.e. the -Si-X group in the silane coupling agent of formula (1) becomes -Si-OH, which forms a hydrogen bond or a covalent bond with the metal on the surface of the metal bolt sleeve as a polar group. The metal surface of the metal bolt sleeve is connected by a hydrogen bond or a covalent bond at room temperature or after heat treatment; at the same time, the other end of the structure of the silane coupling agent of formula (1) reacts with the epoxy resin, i.e. the organic silicon carbon functional group represented by Y-R, Y represents a functional group, and these functional groups can react with epoxy, phenolic hydroxyl, amino, carbonyl, etc. in the organic functional group in the matrix resin to form a covalent bond, realize firm chemical bonding, and thus establish a connection between metal materials and resin surfaces of different properties and complete interface enhancement.

[0042] In the embodiments of the present application, as shown in FIG. 3, after the surface of the metal bolt sleeve is modified by using a silane coupling agent solution, the X group contained in the silane coupling agent 7 is hydrolyzed to produce -Si-OH, the polar surface of the metal bolt sleeve made of metal (which can contain -OH) forms a covalent bond with -Si-OH at room temperature or after heat 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 metal bolt sleeve, thereby enhancing the connection strength between the metal bolt sleeve and the silane coupling agent; after the resin is poured around the silane coupling agent modified metal bolt sleeve, the Y group contained in the silane coupling structure then reacts with the epoxy group in the resin to form a covalent bond, thereby forming a silane coupling agent connection layer, improving the interface bonding performance between the metal bolt sleeve and the resin, and enhancing the static load and fatigue load of the pre-manufactured blade root component containing the same. In FIG. 3, R1 represents the molecular chain of the epoxy resin connected to the epoxy group.

[0043] In some embodiments of the present application, Y is selected from amino, modified amino, epoxy, vinyl, and the silane coupling agent with the above-mentioned groups can improve the connection strength between the metal bolt sleeve and the epoxy resin.

[0044] 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.

[0045] 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.

[0046] In some embodiments of the present application, the pH value of the silane coupling agent solution used for providing the silane coupling agent solution is 1-6. Illustratively, 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 3-6.

[0047] In embodiments of the present application, the pH value of the silane coupling agent solution can be adjusted to 1-6 using an adjusting agent. Adjusting the pH value of the silane coupling agent solution to the above range can enable the silane coupling agent to be more fully connected to the surface of the metal bolt sleeve. Dilute hydrochloric acid, dilute sulfuric acid, dilute nitric acid, acetic acid, citric acid, sodium hydroxide, sodium bicarbonate and other acids or bases can be used to adjust the pH value of the silane coupling agent solution.

[0048] In some embodiments of the present application, the concentration of the silane coupling agent solution used for providing the silane coupling agent solution is 5 Vol% - 25 Vol%. Vol% is the volume percentage, which represents the proportion of the volume of the silane coupling agent as solute in the total volume of the silane coupling agent solution. Illustratively, the concentration of the silane coupling agent solution is 5.3 Vol%, 5.5 Vol%, 5.8 Vol%, 6 Vol%, 6.45.5 Vol%, 7 Vol%, 7.2 Vol%, 7.5 Vol%, 8 Vol%, 8.5 Vol%, 9 Vol%, 9.6 Vol%, 10 Vol%, 10.5 Vol%, 11.5 Vol%, 12 Vol%, 12.4 Vol%, 13.6 Vol%, 14 Vol%, 15 Vol%, 17 Vol%, 18 Vol%, 19 Vol%, 20 Vol%, 21 Vol%, 22 Vol%, 24 Vol%, 24.5 Vol%.

[0049] In embodiments of the present application, by developing interface enhancement technology, the surface of the metal bolt sleeve and other materials is modified using a silane coupling agent as an interface enhancer, realizing silanization or active groupization of the metal surface, and improving the interface bonding between the metal bolt sleeve and the casting resin through chemical bonds such as hydrogen bonds and covalent bonds, thereby improving the static load and fatigue load of the embedded blade root component.

[0050] In some embodiments of the present application, the surface modification treatment of the metal bolt sleeve using the silane coupling agent solution includes: coating the metal bolt sleeve with the silane coupling agent solution by any one of spraying and soaking for surface modification treatment, so as to effectively enhance the interface performance between the metal bolt sleeve and the resin.

[0051] In some embodiments of the present application, the time for surface treatment of the metal bolt sleeve using the silane coupling agent solution is 0-4 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 0-1 hour.

[0052] In some embodiments of the present application, the temperature for drying the metal bolt sleeve subjected to the surface modification treatment using the silane coupling agent solution is 30-120°C. Exemplarily, the temperature for drying the metal bolt sleeve subjected to the surface treatment using 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, 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 50-100°C. The drying temperature can remove the solvent components in the silane coupling agent solution on the surface of the metal bolt sleeve.

[0053] In some embodiments of the present application, before the surface modification treatment of the metal bolt sleeve using the silane coupling agent solution, the metal bolt sleeve is subjected to surface grinding treatment.

[0054] In some embodiments of the present application, the surface roughness of the metal bolt sleeve subjected to the surface grinding treatment is Ra5 to Ra18. The surface roughness can be determined by the test method specified in GB / T 1031-2009.

[0055] In embodiments of the present application, the sand blasting grinding treatment process of the metal bolt sleeve needs to meet the following conditions: the sand used is 10-60 mesh corundum, preferably 30-50 mesh corundum; the air pressure is 0.1-1 MPa, preferably 0.4-0.6 MPa.

[0056] In embodiments of the present application, the surface modification treatment of the metal bolt sleeve subjected to the surface grinding treatment using the silane coupling agent solution can further enhance the adhesion between the metal bolt sleeve and the resin on the basis of the effective enhancement of the adhesion between the metal bolt sleeve and the resin by the silane coupling agent, in combination with the surface grinding treatment process, thereby further improving the interfacial properties between the surface of the metal bolt sleeve and the resin, and further improving the static load and fatigue load of the blade root component.

[0057] In some embodiments of the present application, the metal bolt sleeve is made of a material selected from the group consisting of a conventional steel plate, a 40Cr steel plate, and a 42CrMo steel plate.

[0058] The method for enhancing the interface performance between the metal bolt sleeve and the resin in the embodiments of the present application is based on the interface enhancement technology of silane coupling agent, which can enhance 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 enhancing the load bearing capacity of the blade root.

[0059] In the second aspect, the present application provides a blade root component for manufacturing a wind power blade. The blade root component comprises: a glass fabric 4 which is connected in layers from a first end and is arranged separately towards a second end away from the first end, forming an accommodating cavity 9 with an opening gradually increasing; and a second wedge block 3, a first wedge block 2, and a metal bolt sleeve 5 arranged in the accommodating cavity 9 in sequence from the first end to the second end. The second wedge block 3 is filled in the accommodating cavity 9 close to the first end and connected with the separate glass fabric 4. The first surface of the first wedge block 2 is connected with the second wedge block 3, and the metal bolt sleeve 5 is connected with the second surface of the first wedge block 2 and the glass fabric 4, respectively. The resin connecting part 10 is arranged in the area where the metal bolt sleeve 5 is not connected with the first wedge block 2 and the glass fabric 4. The resin connecting part 10 contains the yarn 1 and connects the first wedge block 2, the glass fabric 4, and the metal bolt sleeve 5, and a silane coupling agent connecting layer 8 is formed between the surface of the resin connecting part 10 and the metal bolt sleeve 5.

[0060] In the embodiments of the present application, the metal bolt sleeve 5 is subjected to surface modification treatment by the method for enhancing the interface performance between the metal bolt sleeve and the resin, and a silane coupling agent connecting layer 8 is formed between the surface of the metal bolt sleeve and the resin connecting part 10, which effectively enhances the interface performance between the metal bolt sleeve 5 and the resin, so that the load bearing capacity of the blade root component containing the metal bolt sleeve 5, the silane coupling agent connecting layer 8, and the resin connecting part 10 is enhanced.

[0061] In some embodiments of the present application, the first wedge block 2 is made of a material selected from the group consisting of epoxy glass steel and vinyl glass steel. In some embodiments, the surface of the first wedge block can also be subjected to the same silane coupling agent modification treatment as the surface modification treatment of the metal bolt sleeve, which enhances the interface performance between the first wedge block and the resin and enhances the load bearing capacity of the prefabricated blade root component.

[0062] In the embodiments of the present application, the resin filled in the areas where the first wedge-shaped block 2 and the glass fabric 4 are not connected, and the first wedge-shaped block 2 and the metal bolt sleeve 5 are not connected, is a two-component epoxy resin system to form the resin connecting part 10. In the two-component epoxy resin system, the main agent is an epoxy resin, and the curing agent is an aliphatic amine or an alicyclic amine or an aromatic amine. Exemplarily, the aliphatic amine can be selected from hexanediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, polyether amine, polyamide, or a combination thereof, the alicyclic amine can be selected from methyltetrahydrophthalene diamine, cyclohexylmethane diamine, 1,3-bis(N-aminomethyl)cyclohexane, dicyclohexylmethane diamine, isophorone diamine, 4,4'-diaminodicyclohexylmethane, or a combination thereof. The aromatic amine can be selected from phenylenediamine, benzene diamine, 4,4'-diaminodiphenyl methane, 4,4'-diaminodiphenyl sulfone, resorcinol diglycidyl ether, or a combination thereof.

[0063] In some embodiments, the first surface 2a and the second surface 2b are two surfaces opposite along the thickness direction T of the first wedge-shaped block 2, and the two sides of the first wedge-shaped block 2 along the length direction L are connected to the separate glass fabric 4 through the epoxy resin. The second wedge-shaped block 3 is a foam wedge-shaped block, which can be made of PET material. The yarn 1 is glass fiber wound on the metal bolt sleeve 5.

[0064] In the embodiments of the present application, the root part is used to manufacture a wind power blade.

[0065] The method for enhancing the interface performance between the metal bolt sleeve and the resin of the root part of the wind power blade of the present application is verified by specific examples and comparative examples below.

[0066] As shown in FIG. 2, the method for enhancing the interface performance between the metal bolt sleeve and the resin of the embodiments of the present application can simultaneously enhance the interface strength between the yarn 1 and the wedge-shaped block 2, the glass fabric 4 and the wedge-shaped block 2, and the metal bolt sleeve 5 and the resin.

[0067] The metal bolt sleeve used in Examples 1-2 and Comparative Examples 1-3 is made of 42CrMo steel material, the first wedge-shaped block used is made of epoxy glass steel material, the epoxy resin used is a general-purpose epoxy resin for filling used in wind power, and the curing agent used is a mixture of hexanediamine and cyclohexylmethane diamine with a mass ratio of 1:1, and the mass ratio of the epoxy resin to the curing agent is 100:30.

[0068] Example 1

[0069] The embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and resin, which comprises the following steps: 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 5 Vol%, and the pH value of the silane coupling agent solution is 3.2; performing surface modification treatment on the metal bolt sleeve by using the silane coupling agent solution, which comprises the following steps: immersing a metal bolt sleeve with a surface roughness of Ra6.3-Ra12.5 after surface sand blasting treatment in the silane coupling agent solution, and then taking out and drying, wherein the drying treatment temperature is 30 DEG C, and the treatment time is 8 hours, so that the hydrogen bond and the covalent bond are formed between the metal bolt sleeve and the silane coupling agent, and a silane coupling agent modified metal bolt sleeve is obtained; and pouring resin on the circumferential side of the silane coupling agent modified metal bolt sleeve, so that the silane coupling agent reacts with the resin to form the covalent bond, and the interface performance between the metal bolt sleeve and the resin is enhanced.

[0070] Example 2

[0071] The embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and resin, which comprises the following steps: 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 5 Vol%, and the pH value of the silane coupling agent solution is 3.2; performing surface modification treatment on the metal bolt sleeve by using the silane coupling agent solution, which comprises the following steps: immersing a metal bolt sleeve with a surface roughness of Ra6.3-Ra12.5 after surface sand blasting treatment in the silane coupling agent solution, and then taking out and drying, wherein the drying treatment temperature is 30 DEG C, and the treatment time is 8 hours, so that the hydrogen bond and the covalent bond are formed between the metal bolt sleeve and the silane coupling agent, and a silane coupling agent modified metal bolt sleeve is obtained; and pouring resin on the circumferential side of the silane coupling agent modified metal bolt sleeve, so that the silane coupling agent reacts with the resin to form the covalent bond, and the interface performance between the metal bolt sleeve and the resin is enhanced.

[0072] Comparative Example 1

[0073] The embodiment of the present application provides a method for enhancing the interface performance between a metal bolt sleeve and resin, which comprises the following steps: 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 5 Vol%, and the pH value of the silane coupling agent solution is 3.2; performing surface modification treatment on the metal bolt sleeve by using the silane coupling agent solution, which comprises the following steps: immersing a metal bolt sleeve with a surface roughness of Ra6.3-Ra12.5 after surface sand blasting treatment in the silane coupling agent solution, and then taking out and drying, wherein the drying treatment temperature is 30 DEG C, and the treatment time is 8 hours, so that the hydrogen bond and the covalent bond are formed between the metal bolt sleeve and the silane coupling agent, and a silane coupling agent modified metal bolt sleeve is obtained; and pouring resin on the circumferential side of the silane coupling agent modified metal bolt sleeve, so that the silane coupling agent reacts with the resin to form the covalent bond, and the interface performance between the metal bolt sleeve and the resin is enhanced.

[0074] Comparative Example 2

[0075] The embodiment of the application provides a method for enhancing the interface performance between a metal bolt sleeve and resin, which comprises the following steps: 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 5 Vol%, and the pH value of the silane coupling agent solution is 3.2; modifying the metal bolt sleeve by using the silane coupling agent solution, including immersing a metal bolt sleeve with a surface roughness of Ra6.3-Ra12.5 after surface sand blasting treatment in the silane coupling agent solution, and then taking out and drying, wherein the drying treatment temperature is 30 DEG C, and the treatment time is 8 hours, so that the hydrogen bond and the covalent bond are formed between the metal bolt sleeve and the silane coupling agent, and a silane coupling agent modified metal bolt sleeve is obtained; and pouring resin on the circumferential side of the silane coupling agent modified metal bolt sleeve, so that the silane coupling agent reacts with the resin to form the covalent bond, and the interface performance between the metal bolt sleeve and the resin is enhanced.

[0076] Comparative Example 3

[0077] The embodiment of the application provides a method for enhancing the interface performance between a metal bolt sleeve and resin, which comprises the following steps: 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 5 Vol%, and the pH value of the silane coupling agent solution is 3.2; modifying the metal bolt sleeve by using the silane coupling agent solution, including immersing a metal bolt sleeve with a surface roughness of Ra6.3-Ra12.5 after surface sand blasting treatment in the silane coupling agent solution, and then taking out and drying, wherein the drying treatment temperature is 30 DEG C, and the treatment time is 8 hours, so that the hydrogen bond and the covalent bond are formed between the metal bolt sleeve and the silane coupling agent, and a silane coupling agent modified metal bolt sleeve is obtained; and pouring resin on the circumferential side of the silane coupling agent modified metal bolt sleeve, so that the silane coupling agent reacts with the resin to form the covalent bond, and the interface performance between the metal bolt sleeve and the resin is enhanced.

[0078] Example 3

[0079] The embodiment provides a root part of a wind turbine blade; the root part of the wind turbine blade comprises: a glass fabric 4 which is connected in a stack from a first end and is arranged separately from a second end away from the first end, forming an accommodating cavity 9 with gradually increasing opening; and a second wedge block 3, a first wedge block 2 and a metal bolt sleeve 5 which are arranged in the accommodating cavity 9 in sequence from the first end to the second end; the second wedge block 3 is filled in the accommodating cavity 9 close to the first end and is connected with the separated glass fabric 4; a first surface of the first wedge block 2 is connected with the second wedge block 3; the metal bolt sleeve 5 is connected with a second surface of the first wedge block 2 and the glass fabric 4 respectively; a resin connecting part 10 is arranged in an area where the metal bolt sleeve 5 is not connected with the first wedge block 2 and the glass fabric 4; the resin connecting part 10 contains the yarn 1 and connects the first wedge block 2, the glass fabric 4 and the metal bolt sleeve 5, and a silane coupling agent connecting layer 8 is formed between surfaces of the resin connecting part 10 and the metal bolt sleeve 5.

[0080] Test part

[0081] The following performance tests are carried out on the interface between the metal bolt sleeve and the resin of the root part of the wind turbine blade of the embodiments 1-2 and the comparative examples 1-3, so as to evaluate the interface reinforcing effect based on the tensile shear performance of the material level:

[0082] (1) Tensile shear strength

[0083] The tensile shear strength performance test is carried out on the interface between the metal bolt sleeve and the resin of the root part of the wind turbine blade of the embodiments 1-2 and the comparative examples 1-3 according to the standard BESN1465-2009.

[0084] The test results of the tensile shear strength are recorded in Table 1 below:

[0085] Table 1

[0086] It should be noted that the tensile shear strength improvement range of the interface between the metal bolt sleeve and the resin of the root part of the wind turbine blade of the embodiments 1-2 and the comparative examples 2-3 is calculated based on the tensile shear strength of the comparative example 1.

[0087] The test results show that the resin is injected into the gap between the yarn 1, the first wedge block 2, the glass fabric 4 and the metal bolt sleeve 5 to form the root part of the wind turbine blade as shown in Fig. 3, and under the action of the silane coupling agent 7, the silane coupling agent connecting layer 8 connected by the interfacial interaction of hydrogen bond and covalent bond is formed between the epoxy resin and the metal bolt sleeve 5, and the additional interaction force of the silane coupling agent connecting layer 8 improves the interfacial performance between the metal bolt sleeve 5 and the epoxy resin, so as to achieve the purpose of reinforcing the root part of the wind turbine blade.

[0088] Fig. 2 shows a structural schematic diagram of the root part of the wind turbine blade provided by the embodiment.

[0089] As can be seen from FIG. 2 and Table 1, compared with the tensile shear strength of 25.96 MPa between the metal bolt sleeve 5 and the resin prepared by only sandblasting and polishing the surface of the metal bolt sleeve in Comparative Example 1, the tensile shear strength between the metal bolt sleeve and the resin prepared by the method for enhancing the interface performance between the metal bolt sleeve and the resin in Example 1-2 is improved. The tensile shear strength between the metal bolt sleeve and the resin prepared in Example 1 and Example 2 is improved 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 prepared in Comparative Example 2 and Comparative Example 3 is improved 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 improvement is less than 1%. The above results show that not all 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 improve the interface performance.

[0090] The above is only a specific embodiment of the present application, and those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process described above can refer to the corresponding process in the foregoing method embodiment, which will not be described here. It should be understood that the protection scope of the present application is not limited thereto, and any person skilled in the art 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 covered within the protection scope of the present application.

Claims

1. A method for enhancing the performance of the interface between a metal bolt sleeve and a resin, characterized by, The method comprises the following steps: providing a silane coupling agent solution; performing surface modification treatment on a metal bolt sleeve by using the silane coupling agent solution, so that hydrogen bonds and covalent bonds are formed between the metal bolt sleeve and the silane coupling agent, thereby obtaining a silane coupling agent modified metal bolt sleeve; pouring resin on the circumferential side of 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 interfacial performance between the metal bolt sleeve and the resin.

2. The method of claim 1, wherein the metal bolt sleeve is made of steel. The molecular structure of the silane coupling agent in the silane coupling agent solution is as follows: Y-R-SiX3 (1), In formula (1), X is C1-C2 alkoxy, acyloxy or chlorine, R is selected from C1-C3 alkyl or phenyl, Y is an organic functional group, and Y is selected from mercapto, polysulfide group, amino, modified amino, vinyl, epoxy, cyano, isocyanate, methacryloxy and glycidyl ether.

3. The method of claim 1, wherein the metal bolt sleeve is made of steel. At least one of the following requirements is met: The silane coupling agent used for providing the silane coupling agent solution is selected from 3-acetoxypropyltrimethoxysilane, KH560, KH570 or a combination thereof; The solvent used for providing the silane coupling agent solution is selected from water, methanol, ethanol, propanol, butanol, pentanol or a combination thereof.

4. The method of claim 1-3, wherein the method is characterized by, The concentration of the silane coupling agent solution is 5 Vol% to 25 Vol%.

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

6. The method of claim 1, wherein the metal bolt sleeve is made of steel. At least one of the following requirements is met: The surface modification treatment of the metal bolt sleeve by using the silane coupling agent solution comprises: coating the metal bolt sleeve with the silane coupling agent solution by any one of spraying and soaking, so as to perform surface modification treatment; The time for performing surface modification treatment on the metal bolt sleeve by using the silane coupling agent solution is 0 hour to 4 hours, and the temperature for drying the metal bolt sleeve subjected to surface modification treatment by the silane coupling agent solution is 30°C to 120°C, which is optionally 50°C to 100°C.

7. The method of claim 1, wherein the metal bolt sleeve is made of steel. Before performing surface modification treatment on the metal bolt sleeve by using the silane coupling agent solution, the following step is further included: performing surface polishing treatment on the metal bolt sleeve.

8. The method of claim 7, wherein the metal bolt sleeve is made of steel. The surface roughness of the metal bolt sleeve subjected to surface polishing treatment is Ra5 to Ra18.

9. The method of claim 1, wherein the metal bolt sleeve is made of steel. The material of the metal bolt sleeve is selected from conventional steel plate, 40Cr steel plate and 42CrMo steel plate.

10. A root part for making a wind turbine blade, wherein The blade root component comprises: a glass fabric (4) connected in a stack from a first end and separately arranged towards a second end away from the first end, forming an accommodating cavity (9) with an opening gradually increasing; and a second wedge-shaped block (3), a first wedge-shaped block (2) and a metal bolt sleeve (5) arranged in the accommodating cavity (9) in sequence 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 connected with the separate glass fabric (4); the first surface of the first wedge block (2) is connected with the second wedge block (3), and the metal bolt sleeve (5) is respectively connected with the second surface of the first wedge block (2) and the glass fabric (4); the metal bolt sleeve (5) is provided with a resin connecting part (10) in the area not connected with the first wedge block (2) and the glass fabric (4); the resin connecting part (10) contains the yarn (1) and connects the first wedge block (2), the glass fabric (4) and the metal bolt sleeve (5), and a silane coupling agent connecting layer (8) is formed between the surfaces from the resin connecting part (10) to the metal bolt sleeve (5).

Images