CN111873490A - Pre-embedded strip, equipment and process for epoxy resin-based fiber-reinforced high-modulus wind turbine blades - Google Patents

Abstract

The invention discloses a pre-embedded strip, equipment and a process for epoxy resin-based fiber reinforced high-modulus wind power blades. The pre-embedded strip includes a composite material body and a composite surface felt, and the composite surface felt is arranged on the upper and lower sides of the composite material body. On the surface; the composite material body is a glass fiber reinforced epoxy resin composite material; the glass fiber includes roving glass fiber, bulked yarn glass fiber and glass fiber cloth, the roving glass fiber and bulked yarn The glass fibers are uniformly arranged in multiple layers along the length direction in the composite material body to form a multi-layer structure, and at least one layer of the glass fiber cloth is provided in the multi-layer structure along the length direction. The pre-embedded strip is a high-modulus pre-embedded strip reinforced by epoxy resin-based fibers. The pre-embedded strip manufactured by this method has the advantages of high modulus, certain toughness and anti-aging properties, and can meet the current requirements for the production of blades of units below 7MW. .

Description

Pre-embedded strip, equipment and process for epoxy resin-based fiber-reinforced high-modulus wind turbine blades

technical field

The invention belongs to the field of wind power generation, and in particular relates to a pre-embedded strip, equipment and a process for epoxy-based fiber reinforced high-modulus and high-toughness wind power blades.

Background technique

A wind turbine is a power generation device composed of blades, transmission systems, generators, power storage equipment, towers and electrical systems. To obtain greater wind power, the key is to have blades that can rotate briskly, so wind power Blade technology is the core technology of wind turbines.

Because the blade directly faces the wind to obtain wind energy, the blade is required to have a reasonable structure, high-quality materials and advanced technology to enable the blade to reliably bear the wind force, the self-weight of the blade, centrifugal force and other bending distance pulling forces, high structural strength, anti-fatigue , high temperature resistance, reliable operation, easy to manufacture, manufacturing cost and use cost are all factors to be considered.

An important sign of the development of wind power technology is the increase in the capacity of a single machine. Every time its capacity doubles, the cost of power generation will drop by about 15%. Countries in the world that develop wind power are constantly increasing the power generation capacity of a single machine. With the improvement of wind turbine blade design technology, the development of wind power generation from high power, the direction of long blades, and the increase in blade size can improve the economy of wind power generation and reduce power generation costs. The blade length has developed from 4.5 meters in 1980 to today's 90 meters, the capacity has developed from the original 55KW to today's 10MW, and the materials have also developed from wood and metal to today's composite materials. Generally, the smaller blade is less than 22 meters, and E or ECR glass fiber reinforced plastic is used, and the resin base is unsaturated polyester resin. Vinyl resin and epoxy resin can also be used, and the larger blade is more than 42 meters, generally E or ECR glass fiber + epoxy resin base and carbon fiber + epoxy resin base reinforced plastic, because the cost of carbon fiber is close to epoxy resin Ten times that of resin, the performance is the highest but the cost performance is poor. At present, glass fiber reinforced plastic + epoxy resin base is basically used to produce blade materials, so as the length of the blade increases, the strength of the blade also increases.

The wind turbine blade is a thin shell structure made of fiber reinforced composite material, which is composed of the root shell and the main beam. The root of the blade is the key part of the connection between the blade and the rotor hub of the wind turbine, which is subjected to complex shearing, extrusion, bending and torsion. combination effect. Therefore, the blade root connection must have sufficient mechanical strength and bending stiffness. The connection between the blade bolt and the blade root is usually the method of pre-embedding and connecting the blade root bolt sleeve, and the pre-embedded strip improves the strength of the blade by pre-embedding the blade root. and stability, to ensure the reliable connection between the blade bolt and the rotor hub, and the safe operation of the blade.

The unsaturated polyester resin + glass fiber reinforcement has low manufacturing cost, but the strength cannot meet the requirements of the strength of large-sized blades. Carbon fiber has high strength and light weight, which is the direction of blade design and development in the future, but the price of carbon fiber is too high, and the production cost of blade is too high, so it cannot be commercialized in large quantities.

SUMMARY OF THE INVENTION

In order to overcome the technical problem that the strength of unsaturated polyester resin products cannot meet the strength of large-sized blades, the purpose of the present invention is to provide a pre-embedded strip, equipment and process for epoxy resin-based fiber reinforced high-modulus wind power blades. The pre-embedded strip is a high-modulus pre-embedded strip reinforced by epoxy resin-based fibers. The pre-embedded strip manufactured by this method has the advantages of high modulus, certain toughness and anti-aging properties, which can meet the current requirements for the production of blades for units below 7MW. .

In order to achieve the above object, the present invention adopts the following technical means:

An epoxy resin-based fiber-reinforced pre-embedded strip for a high-modulus wind power blade, comprising:

a composite material body and a composite surface felt, the composite surface felt is arranged on the upper and lower surfaces of the composite material body; the composite material body is a glass fiber reinforced epoxy resin composite material;

The glass fibers include untwisted roving glass fibers, bulked yarn glass fibers and glass fiber cloth. At least one layer is provided in the composite material body along the length direction.

As a further improvement of the present invention, the composite material body includes in mass percent:

Glass fiber: 70%-78%;

Epoxy resin: 11.5%-18%;

Curing agent: 8.5%-13%;

Accelerator: 0.5%-0.65%;

Other additives: 0.08%-0.12%;

As a further improvement of the present invention, the curing agent is methyl tetrahydrophthalic anhydride or methyl nadic anhydride;

Described accelerator is DMP30 or imidazole;

The other auxiliary agents are one or more of ultraviolet absorbers, antioxidants and light stabilizers.

As a further improvement of the present invention, the glass fiber comprises by mass percentage:

Untwisted roving glass fiber: 70-80%;

Bulk yarn glass fiber: 20%-25%;

Fiberglass cloth: 5-10%.

As a further improvement of the present invention, the glass fiber cloth is a fiber cloth obtained by stitching multiaxial fibers; the composite surface felt is obtained by compounding the glass fiber cloth and the polyester surface felt.

An epoxy resin-based fiber reinforced high-modulus embedded strip manufacturing equipment for wind power blades, comprising a yarn creel, a yarn guide, a first placing frame, a first yarn guiding felt board, a dipping tank, a Two yarn guide felt plates, a second placing frame, a mold, a pulling device and a cutting machine;

The creel is used for placing the yarn group of untwisted roving glass fiber and bulked glass fiber; the first placing frame is used for placing glass fiber cloth; the dipping tank is filled with glue;

A second placing rack is respectively arranged on the upper and lower part of the second yarn guiding felt plate, and the second placing rack is used for placing the composite surface felt;

When working, the yarn end of the yarn group enters the dipping tank through the yarn guide frame and the glass fiber cloth through the first yarn guide felt plate, and then enters the upper and lower composite surface felts together with the second yarn guide felt plate. The mold; after the mold is out, it is pulled to the cutting machine by the pulling device.

As a further improvement of the present invention, each row of the creel is provided with a yarn threading plate, and the yarn ends of the yarn group pass through each threading plate in an orderly manner and are evenly arranged on the yarn guide according to the number of layers.

As a further improvement of the present invention, the shape of the end face of the second yarn guide felt plate is consistent with the shape of the cut face of the embedded part and is proportionally enlarged;

The two first placement frames are arranged between the yarn guide frame and the first yarn guide felt plate.

As a further improvement of the present invention, the glue solution is composed of epoxy resin, curing agent, accelerator and other auxiliary agents.

The production process based on epoxy resin-based fiber reinforced embedded strip manufacturing equipment for high-modulus wind power blades includes the following steps:

The amount of glass fiber The yarn groups of untwisted roving glass fibers and bulked glass fibers are placed on the creel, and the yarn ends of the yarn groups are evenly passed through the yarn guide according to the number of layers, and enter the first yarn guide felt plate;

The glass fiber cloth placed on the first placing rack is distributed in the glass fiber roving glass fiber and the glass fiber bulk yarn through the first yarn guiding felt plate to form a multi-layer structure;

The multi-layer structure enters the dipping tank for dipping; after dipping, it enters the second yarn guide felt plate for pre-forming;

Two composite surface felts are arranged on the upper and lower surfaces of the dipped composite structure, and enter the mold together for heating and curing to form strip-shaped embedded parts;

The strip-shaped embedded parts are pultruded by the pulling device and cut by a cutting machine to obtain a single embedded strip.

Compared with the prior art, the present invention has the following advantages:

The main body of the pre-embedded strip for wind power blades of the present invention is reinforced with epoxy resin-based fibers, and the pre-embedded part is added with bulking yarn in the production process. When resin enters the product, enough epoxy resin can ensure reliable bonding between glass fiber and epoxy resin interface. The addition of glass fiber multi-axial cloth (felt) ensures that the multi-directional force strength of the product increases and improves the strength of the wind blade.

Further, by adding anti-ultraviolet agents, antioxidants, light stabilizers and other additives to the epoxy resin glue, the anti-ultraviolet, anti-aging, and longevity of the products can be improved.

Further, the present invention adds bulk yarn, multiaxial glass fiber composite mat and high-performance epoxy resin, and adds antioxidants, anti-ultraviolet agents, light stabilizers and other auxiliary agents to the resin base. It can better improve the mechanical properties and anti-aging properties of the product.

Further, due to the addition of bulked yarn and glass fiber multi-axial cloth in the product, the pre-formed yarn guide felt plate is added before the glass fiber, bulked yarn and glass fiber multi-axial cloth are added into the mold to ensure the glass fiber. , Bulk yarn, glass fiber multi-axial mat smoothly enters the mold, and the product forms a network structure to improve the overall strength of the product.

The glass fiber in the device of the invention is a combination of ordinary pultruded glass fiber and bulk glass fiber, which can not only meet the requirements of high modulus of wind power blades, but also meet the requirements of the pre-embedded strip products for wind power blades to the proportion of each component. Requirements; bulked glass fiber has the characteristics of large volume and strong adsorption capacity. By increasing the amount of bulked glass fiber, the amount of untwisted roving glass fiber can be reduced, and its strong adsorption capacity can bring more glue into the Mould cavity, increase the content ratio and volume ratio of resin and fiber in the embedded product. The content ratio of glass fiber and resin can be better controlled, and the toughness of the product can also be improved after the resin content is increased. At the same time, it can reduce the weight of the embedded parts, which is beneficial to the quality control of the next process of the product. The use of adding glass fiber cloth (felt) can improve the overall strength of the embedded parts, especially the transverse strength.

Further, through the uniform arrangement and multi-layer design of various glass fiber products, different glass fibers are evenly distributed according to the pre-designed positions through each yarn guide and pre-formed plate in front of the mold. Prepare for the diversion before the cladding design. Through the preformed plate in front of the mold, it enters the mold smoothly, orderly, neatly and evenly, and heats and solidifies to form, which ensures the high modulus and high toughness performance requirements of the comprehensive strength requirements of the embedded product.

Further, by adding the composite surface felt, the anti-aging ability of the product can be further improved. Adding the composite surface felt can increase the thickness of the resin layer on the surface of the product, and form a thick protective film on the surface of the product. The polyester surface felt itself It has a good anti-aging function, and the mutual cooperation of various additives further improves the excellent anti-aging ability of the product.

The preparation process of the present invention uses high-quality epoxy resin, curing agent and glass fiber pultrusion. The glass fibers are placed on the creel and pass through the yarn guides in order to ensure uniform tension of the glass fibers. The pre-embedded strips for wind power blades of the present invention include transverse tensile strength, impact strength, anti-aging properties, high toughness, and high modulus, and the composition distribution of each component is more uniform, and the cost control is more reasonable.

Description of drawings

FIG. 1 is a schematic diagram of the manufacturing equipment of the embedded strip for wind power blades according to the present invention.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

As shown in FIG. 1 , the present invention provides an epoxy resin-based fiber reinforced embedded strip manufacturing equipment for high-modulus wind power blades, including a yarn creel 1, a yarn guide frame 2, a first placing frame 3, The first yarn guiding felt plate 4, the dipping tank 5, the second yarn guiding felt plate 6, the second placing frame 7, the mold 8, the pulling device 9 and the cutting machine 10;

The creel 1 is used for placing the yarn mass of untwisted roving glass fiber and bulked glass fiber; the first placing frame 3 is used for placing glass fiber cloth; the dipping tank 5 is filled with glue;

The second yarn guide plate 6 is respectively provided with a second placement rack 7 up and down, and the second placement rack 7 is used to place the composite surface felt; each row of the yarn rack 1 is provided with a yarn threading plate, and the yarn The heads pass through each yarn passing plate in an orderly manner and are evenly arranged on the yarn guide 2 according to the number of layers.

The shape of the end face of the second yarn guiding felt plate 6 is consistent with the sectional shape of the embedded part and is proportionally enlarged; the two first placement frames 3 are arranged between the yarn guiding frame 2 and the first yarn guiding felt plate 4 . The glue is composed of epoxy resin, curing agent, accelerator and other auxiliary agents.

During operation, the yarn end of the yarn group enters the dipping tank 5 through the first yarn guide felt board 4 together with the glass fiber cloth through the yarn guide frame 2, and is combined with the upper and lower two pieces after passing through the second yarn guide felt board 6. The surface felt enters the mold 8 together; after exiting the mold 8, it is pulled to the cutting machine 10 by the pulling device 9.

The two kinds of glass fibers on the creel 1 are reasonably arranged according to the batching ratio, so that the two kinds of glass fibers entering the creel 2 are evenly distributed and meet the requirements of mass proportioning on a single cross section.

As a preferred embodiment, each row of the yarn rack 1 is provided with a yarn threading plate, and the yarn ends of the yarn group pass through each threading plate in an orderly manner and are evenly arranged on the yarn guide frame 2 according to the number of layers.

As a preferred embodiment, one or more of the first placement racks 3 are provided, and the glass fiber cloth enters the first yarn guiding felt board 4 in one or more rows.

As a preferred embodiment, the shape of the end face of the second yarn guiding felt plate 6 is the same as the shape of the sectional face of the embedded part, and is proportionally enlarged.

As a preferred embodiment, two first placement racks 3 are arranged between the yarn guide frame 2 and the first yarn guide felt board 4 .

The invention also provides a production process of the epoxy resin-based fiber-reinforced high-modulus embedded strip manufacturing equipment for wind power blades, comprising the following steps:

The amount of glass fiber The yarn groups of untwisted roving glass fibers and bulked glass fibers are placed on the creel 1, and the yarn ends of the yarn groups evenly pass through the yarn guide 2 according to the number of layers, and enter the first yarn guide Felt guide plate 4;

The glass fiber cloth placed on the first placing rack 3 is distributed in the glass fiber roving glass fiber and the glass fiber bulked yarn through the first yarn guiding felt plate 4 to form a multi-layer structure;

The multi-layer structure enters the dipping tank 5 for dipping; after dipping, it enters the second yarn guide felt board 6 for pre-forming;

Two composite surface felts are arranged on the upper and lower surfaces of the dipped composite structure, and enter the mold 8 together for heating and curing to form strip-shaped embedded parts;

The strip-shaped embedded parts are cut by the cutting machine 10 under the pultrusion of the pulling device 9 to obtain a single embedded strip.

The specific process is as follows:

Before production, budget the amount of glass fiber to be used, distribute it evenly in the proportion of 20%-30%, 80%-70%, divide the glass fiber into untwisted roving glass fiber and bulk glass fiber, and put it on the creel 1 , the yarns on the creel 1 must be arranged in an orderly manner, one row horizontally and one row vertically. There is a corresponding yarn threading board above each row of yarns. Do not deviate from the center point, then take out the yarn end of the yarn group, and pass through each yarn threading board in an orderly manner, without crossing, winding, springboard, etc. with each other.

In front of the creel 1, there is a yarn guide 2, and the yarns of each layer pass through the yarn guide 2 in an orderly manner, and are evenly arranged on the yarn guide 2 according to the number of layers. There is a first yarn guide in front of the yarn guide 2. The felt guide plate 4, between the yarn guide frame 2 and the first yarn guide felt plate 4, there is a first placement frame 3 of glass fiber cloth. The glass fiber cloth passes through the first yarn guide felt plate 4 and is evenly distributed in two layers. Glass fiber roving between fiberglass and fiberglass bulked yarn. There is a dipping box (slot) 5 in front of the first yarn guiding felt guide plate 4, and a preformed second yarn guiding felt plate 6 in front of the rubber dipping box (slot) 5. The shape of the second yarn guiding felt plate 6 It is the same as the shape of the section of the embedded product, but the size is enlarged to ensure that the glass fiber is evenly distributed and the layers are clear. The felt plate 4, the dipping box (slot) 5, and the second yarn guide and felt plate 6 enter the mold 8, and through the pulling device 9, all the glass fibers are pulled out of the mold 8, and the mold 8 is heated to a predetermined temperature. set temperature. There are two upper and lower composite surface felt second racks 7 at the entrance of the mold 8. The upper and lower composite surface felts and the glass fiber impregnated with glue enter the mold 8 together and pull out the mold 8. The traction device 9 needs to be installed and embedded parts. The fixture device with the same cut surface shape ensures that the production process does not slip or stop, and the produced products are not deformed or twisted. There is a cutter 10 in front of the pulling device 9, which cuts to the required size.

Further, the mold 8 is provided with a plurality of heating sections along the advancing direction of the yarn head.

The mold 8 is heated in stages, wherein the temperatures of the A/B/C sections are: 100°C to 150°C in the A zone; 150°C to 175°C in the B zone; and 160°C to 180°C in the C zone.

Heat the mold 8 to a pre-set temperature, prepare the glue in advance according to the designed ratio, and pour the prepared glue into the dipping box (tank) 5, start the production, and adjust the pultrusion speed to Within the scope of the process requirements, the product is smoothly passed through the traction device 9, sawed off the waste head that is not soaked well in the front, observed whether there are cracks on the end face and outer surface of the product, and measured whether the size of the product meets the requirements.

Wherein, the glue liquid is a premix material composed of epoxy resin, curing agent, accelerator and other auxiliary agents.

Preferably, there are two pulling devices 9 , and the two pulling devices 9 are arranged at intervals, and the yarn ends enter the cutting machine 10 after passing through the two pulling devices 9 in sequence.

Further, the traction speed is 8-15cm/min.

The epoxy resin-based fiber-reinforced pre-embedded strip for high-modulus wind power blades prepared by the present invention, in terms of structure, includes:

a composite material body and a composite surface felt, the composite surface felt is arranged on the upper and lower surfaces of the composite material body; the composite material body is a glass fiber reinforced epoxy resin composite material;

The glass fibers include untwisted roving glass fibers, bulked yarn glass fibers and glass fiber cloth. At least one layer is provided in the composite material body along the length direction.

The embedded part is composed of the following chemical components in terms of chemical composition: glass fiber, epoxy resin, curing agent, accelerator, and other auxiliary agents. The chemical composition ratio (weight ratio) of the embedded part is:

Glass fiber: 70%-78%;

Epoxy resin: 11.5%-18%;

Curing agent: 8.5%-13%;

Accelerator: 0.5%-0.65%;

Other additives: 0.08%-0.12%.

The glass fiber refers to: E or ECR glass fiber, and the glass fiber includes: roving glass fiber, bulk glass fiber and glass fiber cloth or cloth.

Among them, the untwisted roving glass fiber is a special glass fiber for pultrusion, and the bulk glass fiber is a fiber processed by a special process. It can effectively control the proportion and distribution of glass fiber and resin in the product, and ensure the stability of the product. The use ratio of bulk glass fiber and roving glass fiber is:

Bulk glass fiber accounts for 20%-30% of the total fiber;

Untwisted roving glass fiber accounts for 80%-70% of the total fiber;

Glass fiber cloth accounts for 5-10% of the total fiber content.

Among them, the glass fiber cloth (felt) is a fiber cloth (felt) formed by stitch-bonding multi-axial fibers. Specifically, there are fibers in multiple directions, including transverse fibers, longitudinal fibers, and fibers with an oblique angle of 45 degrees. In the product, the comprehensive strength of the product can be greatly improved, because the pultrusion process is mostly longitudinal fibers, so the longitudinal tensile strength is high, but the transverse strength is relatively low. The addition of multi-axial fiber cloth (felt) can greatly improve this. This kind of problem, because the multi-axial fiber cloth (felt) has fibers in multiple directions, which can effectively improve the amount of transverse fibers in the product, form a mesh form with the longitudinal fibers, and greatly improve the transverse strength and comprehensive strength of the product.

The composite surface felt is a kind of felt which is composed of fiber felt and polyester surface felt. The main function is to increase the thickness of the resin layer on the surface of the product, increase the surface brightness of the product, and improve the anti-aging ability of the product.

The epoxy resin refers to: high performance, high toughness epoxy resin, this epoxy resin can greatly improve the toughness performance of the product, the product made of ordinary epoxy resin has high strength, strong rigidity but high brittleness and poor toughness. . This high-performance and high-toughening epoxy resin can not only ensure the high strength and rigidity of the product, but also ensure the high toughness of the product, and improve the impact resistance and temperature resistance and cracking resistance of the product.

The curing agent refers to: methyl tetrahydrophthalic anhydride or methyl nadic anhydride.

The accelerator refers to: DMP30 or imidazole.

The other auxiliary agents refer to: ultraviolet absorbers, antioxidants, light stabilizers and other auxiliary agents.

The embedded parts manufactured by the above components can strictly control the proportion of each component in the embedded part, especially the proportion of resin and glass fiber, and the uniformity of the distribution of each component, so as to improve the toughness and product quality of the embedded part Stability, impact resistance and anti-aging properties.

By selecting different types and high-performance chemical components, the present invention evenly distributes each component in the embedded product, roughly controls the proportion and content of each component, and strictly controls the process index parameters, so that each component can produce a high-quality mold through the molding die. High toughness glass fiber reinforced embedded parts.

The following specific groups of common embodiments are given to describe the present invention in detail.

Example 1

The chemical composition ratio (weight ratio) of the embedded part is:

Fiberglass: 78%

Epoxy: 12.92%

Curing agent: 8.5%; methyltetrahydrophthalic anhydride;

Accelerator: 0.5%, imidazole;

Other additives: 0.08%, such as UV absorber, antioxidant, light stabilizer additives.

The glass fiber is E glass fiber, and the glass fiber includes: roving glass fiber, bulk glass fiber and glass fiber cloth or cloth. In the glass fiber, the usage ratio is:

Bulk glass fiber accounts for 20% of the total fiber;

Untwisted roving glass fiber accounts for 70% of the total fiber content.

Glass fiber cloth accounts for 10% of the total fiber content.

Example 2

The chemical composition ratio (weight ratio) of the embedded part is:

Fiberglass: 74.3%

Epoxy: 15%

Curing agent: 10%, methyl nadic anhydride;

Accelerator: 0.6%, DMP30;

Other additives: 0.1%, such as UV absorbers, antioxidants.

The said glass fiber adopts ECR glass fiber, and the glass fiber includes: untwisted roving glass fiber, bulk glass fiber and glass fiber cloth or cloth. The ratio used is:

Bulk glass fiber accounts for 20%-30% of the total fiber;

Untwisted roving glass fiber accounts for 80%-70% of the total fiber.

Glass fiber cloth accounts for 5-10% of the total fiber content.

Example 3

The chemical composition ratio (weight ratio) of the embedded part is:

Fiberglass: 70%

Epoxy: 18%

Curing agent: 11.23%, methyltetrahydrophthalic anhydride;

Accelerator: 0.65%, DMP30;

Other additives: 0.12%, such as UV absorbers.

The glass fiber adopts E ECR glass fiber, and the glass fiber includes: untwisted roving glass fiber, bulk glass fiber and glass fiber cloth or cloth. The ratio used is:

Bulk glass fiber accounts for 20%-30% of the total fiber;

Untwisted roving glass fiber accounts for 80%-70% of the total fiber.

Glass fiber cloth accounts for 5-10% of the total fiber content.

The above are several groups of common formulations of the present invention, and other formulations can also achieve the effect of improving material properties.

The epoxy resin-based fiber-reinforced pre-embedded strip for high-modulus wind turbine blades produced through this formula design and process design has excellent properties such as high modulus, high toughness, anti-aging and impact resistance. Table 1 is the mechanical property test of the epoxy resin-based fiber reinforced embedded strip for high-modulus wind turbine blades prepared by the present invention, and the chemical ratio of Example 2 is specifically adopted.

Table 1

project Unsaturated system epoxy system Tensile Strength 406MPa 856MPa compressive strength 169MPa 682MPa Bending strength 533MPa 824MPa

As can be seen from Table 1 above, the epoxy resin-based fiber-reinforced high-modulus embedded strip for wind power blades of the present application has excellent mechanical properties, satisfies the advantage of high modulus, and can meet the current requirements for blade production of units below 7MW.

To sum up, the characteristics of the present invention are:

1. Improve the high modulus, high toughness, anti-aging and impact resistance of the product by selecting high-quality raw materials, especially resin matrix, glass fiber, etc. The resin is made of high-toughness resin. The resin has high modulus and high toughness, so that the produced epoxy resin-based fiber reinforced high-modulus embedded strip for high-modulus wind power blades has high modulus and high toughness, which is in line with the technology of this product. It is required that the glass fiber is a combination of ordinary pultruded glass fiber and expanded glass fiber, which can not only meet the requirements of high modulus of wind power blades, but also meet the requirements of epoxy resin-based fiber reinforced embedded strip products for high-modulus wind power blades. Requirements for the proportion of components; bulked glass fiber has the characteristics of large volume and strong adsorption capacity. By increasing the amount of bulked glass fiber, the amount of untwisted roving glass fiber can be reduced, and its strong adsorption capacity can be used. More glue enters the mold cavity, increasing the content ratio and volume ratio of resin to fiber in the embedded product. The content ratio of glass fiber and resin can be better controlled, and the toughness of the product can also be improved after the resin content is increased. At the same time, it can reduce the weight of the embedded parts, which is beneficial to the quality control of the next process of the product. The use of adding glass fiber cloth (felt) can improve the overall strength of the embedded parts, especially the transverse strength.

2. Through the uniform arrangement and multi-layer design of various glass fiber products, through each yarn guide and pre-formed plate in front of the mold, the different glass fibers are evenly distributed according to the pre-designed positions. Prepare for the diversion before the cladding design.

Through the preformed plate in front of the mold, it enters the mold smoothly, orderly, neatly and evenly, and heats and solidifies to form, which ensures the high modulus and high toughness performance requirements of the comprehensive strength requirements of the embedded product.

3. By adding additives such as ultraviolet absorbers, light stabilizers, antioxidants, etc., the anti-aging properties of the embedded strips for epoxy resin-based fiber reinforced high-modulus wind turbine blades can be improved, and their service life can be extended. By adding the composite surface felt, the anti-aging ability of the product can also be further improved. Adding the composite surface felt can increase the thickness of the resin layer on the surface of the product and form a thick protective film on the surface of the product. The polyester surface felt itself has Good anti-aging function, coupled with the mutual cooperation of various additives, further improves the excellent anti-aging ability of the product.

To sum up, the present invention selects advanced raw materials, uses advanced design concepts of cladding and the addition of related additives, controls the proportion of each component, the degree of uniformity of distribution, the control of resin content, and the strict control of formula design and process, etc. From each link to the final molding, the quality stability, high strength requirements, impact resistance and anti-aging properties of the invented product are guaranteed, so that the economic benefit and cost control of the invented product are well guaranteed.

The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, all It is considered to be the range described in this specification.

The above examples only represent several embodiments of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

It should be understood that the above description is for purposes of illustration and not limitation. From reading the above description, many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the preceding claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are incorporated herein by reference for the purpose of being comprehensive. The omission of any aspect of the subject matter disclosed herein in the preceding claims is not intended to disclaim such subject matter, nor should the applicant be considered as not considering such subject matter as part of the disclosed subject matter.

Claims (10)

1. The utility model provides an epoxy base fibre reinforcing high modulus wind-powered electricity generation is pre-buried strip for blade which characterized in that includes:

the composite material comprises a composite material body and composite surfacing felts, wherein the composite surfacing felts are arranged on the upper surface and the lower surface of the composite material body; the composite material body is a glass fiber reinforced epoxy resin composite material;

the glass fiber comprises glass fiber roving, glass fiber bulk yarn and glass fiber cloth, wherein the glass fiber roving and the glass fiber bulk yarn are uniformly arranged in the composite material body along the length direction, and at least one layer of glass fiber cloth is arranged in the composite material body along the length direction.

2. The epoxy resin based fiber reinforced high modulus embedded strip for wind power blade according to claim 1, wherein the composite material comprises the following components in percentage by mass:

glass fiber: 70% -78%;

epoxy resin: 11.5% -18%;

curing agent: 8.5% -13%;

accelerator (b): 0.5% -0.65%;

other auxiliary agents: 0.08 to 0.12 percent.

3. The embedded strip for the epoxy resin-based fiber-reinforced high-modulus wind power blade as claimed in claim 2,

the curing agent is methyl tetrahydrophthalic anhydride or methyl nadic anhydride;

the accelerant is DMP30 or imidazole;

the other auxiliary agents are one or more of ultraviolet absorbent, antioxidant and light stabilizer.

4. The embedded strip for the epoxy resin-based fiber-reinforced high-modulus wind power blade according to claim 1, wherein the glass fiber comprises the following components in percentage by mass:

roving glass fiber without twist: 70-80%;

bulk yarn glass fiber: 20% -25%;

glass fiber cloth: 5 to 10 percent.

5. The embedded strip for the epoxy resin-based fiber-reinforced high-modulus wind power blade according to claim 1, wherein the glass fiber cloth is fiber cloth formed by stitching and knitting multi-axial fibers; the composite surface felt is obtained by compounding glass fiber cloth and polyester surface felt.

6. The manufacturing equipment of the embedded strip for the epoxy resin-based fiber-reinforced high-modulus wind power blade is characterized by comprising a creel (1), a yarn guide frame (2), a first placing frame (3), a first yarn guide felt guide plate (4), a glue dipping groove (5), a second yarn guide felt guide plate (6), a second placing frame (7), a mold (8), a traction device (9) and a cutting machine (10) which are sequentially arranged;

the creel (1) is used for placing yarn groups of the glass fiber of the twistless roving and the bulked glass fiber; the first placing rack (3) is used for placing glass fiber cloth; the glue solution is filled in the glue dipping tank (5);

a second placing rack (7) is respectively arranged above and below the second yarn guide felt plate (6), and the second placing rack (7) is used for placing the composite surface felt;

when the device works, the yarn end of the yarn group passes through the yarn guide frame (2), enters the glue dipping tank (5) together with the glass fiber cloth through the first yarn guide felt plate (4), passes through the second yarn guide felt plate (6), and then enters the die (8) together with the upper and lower composite surface felts; after the die (8) is taken out, the die is drawn to a cutting machine (10) by a drawing device (9).

7. The manufacturing equipment according to claim 6, characterized in that the creel (1) is provided with threading plates in each row, and the yarn ends of the yarn groups sequentially penetrate through each threading plate and are correspondingly and uniformly arranged on the yarn guide frame (2) according to the number of layers.

8. The manufacturing apparatus according to claim 6,

the end surface shape of the second yarn guiding felt plate (6) is consistent with the section shape of the embedded part and is amplified in equal proportion;

two first racks (3) are arranged between the yarn guide (2) and the first yarn guiding felt plate (4).

9. The manufacturing equipment as claimed in claim 6, wherein the glue solution is composed of epoxy resin, curing agent, accelerator and other auxiliary agents.

10. Production process of a manufacturing apparatus according to any of claims 6 to 9, characterized by comprising the following steps:

putting a yarn group of the twistless roving glass fiber and the bulked glass fiber on a creel (1) according to the glass fiber quantity, and uniformly penetrating yarn heads of the yarn group through a yarn guide frame (2) according to the number of layers and entering a first yarn guide felt plate (4);

the glass fiber cloth placed on the first placing rack (3) is distributed in glass fiber roving glass fiber and glass fiber bulked yarn through a first yarn guiding felt plate (4) to form a multi-layer structure;

the multilayer structure enters a glue dipping tank (5) for glue dipping; after gum dipping, the mixture enters a second yarn guiding felt plate (6) for preforming;

the two composite surface felts are arranged on the upper surface and the lower surface of the compound layer structure which is soaked with glue and enter a mould (8) together for heating and curing to form a strip-shaped embedded part;

the strip-shaped embedded part is pulled and extruded by a traction device (9) and cut by a cutting machine (10) to obtain a single embedded strip.

Images