CN113370559B - Continuous linear resin-based fiber reinforced prepreg - Google Patents
Continuous linear resin-based fiber reinforced prepreg Download PDFInfo
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- CN113370559B CN113370559B CN202110641112.5A CN202110641112A CN113370559B CN 113370559 B CN113370559 B CN 113370559B CN 202110641112 A CN202110641112 A CN 202110641112A CN 113370559 B CN113370559 B CN 113370559B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
- B29C70/52—Pultrusion, i.e. forming and compressing by continuously pulling through a die
- B29C70/521—Pultrusion, i.e. forming and compressing by continuously pulling through a die and impregnating the reinforcement before the die
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/542—Placing or positioning the reinforcement in a covering or packaging element before or during moulding, e.g. drawing in a sleeve
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
- B29C70/681—Component parts, details or accessories; Auxiliary operations
- B29C70/683—Pretreatment of the preformed part, e.g. insert
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Abstract
The invention discloses a continuous linear resin-based fiber reinforced prepreg, and a preparation method thereof comprises the following steps in sequence: s1, impregnating continuous longitudinal fibers with resin to obtain a prepreg, and continuously welding or extruding metal to obtain a tube blank; s2, continuously bringing the prepreg into the tube blank to obtain a material to be deformed; s3, synchronously driving the prepreg and the pipe blank of the material to be deformed, changing the section of the pipe blank through a drawing or rolling process or/and deforming the space form of the pipe blank through the action of a die to obtain continuous material to be formed with the same or different space forms, and continuously preparing the continuous deformation composite material section, wherein the availability of the continuous deformation composite material section can ensure the requirement of the composite material value engineering design which needs to synthesize various performance requirements.
Description
Technical Field
The invention relates to the field of composite materials, in particular to a continuous linear resin-based fiber reinforced prepreg, which is a divisional application of a Chinese patent 'a continuous deformation composite material section bar and a preparation method thereof' with the application number of 202010710421.9 and the application date of 2020.07.22.
Background
A high-strength fiber composite material profile produced by bundling a plurality of long high-strength fibers and impregnating the bundled high-strength fibers with a resin has high tensile strength, low stretchability, light weight, and excellent corrosion resistance, and therefore, has been widely used for bridges, concrete structures, power transmission lines, and the like.
In the prior art, the process for preparing the high-strength fiber composite material section comprises the following steps: the method comprises the steps of firstly twisting and fixing continuous carbon fiber and other fiber materials together, then penetrating through a substrate material epoxy resin impregnation tank for full impregnation, then pulling out the fiber materials by an extrusion forming die, and finally passing the pulled-out bundle-shaped product through a curing chamber to fully harden the resin indoors, such as the carbon fiber composite stranded wire manufacturing method and equipment disclosed in Chinese patent CN101295564B and the fiber composite stranded cable disclosed in CN 201933348U. These fabrication methods have a common, irreconcilable challenge: when the resin in the prepreg is heated, crosslinked and cured, the resin is subjected to a low-viscosity viscous state, a gel state and a glass state in sequence, and the ribbon tightly wound on the surface of the prepreg cannot be prevented from being twisted into a cable or being seriously deformed when heated, so that the resin is exuded, and bubbles are generated during the curing reaction due to insufficient pressure holding; in addition, the resin penetration will cause the wire to be adhered and solidified, and the twisted structure will lose the winding characteristic which should be possessed, and the anti-breaking capability is poor.
In order to improve the breaking resistance of the wire, CN105304189A utilizes a pultrusion technology to manufacture a composite wire with the diameter of 1.7-4.0mm, utilizes a longitudinal-clad-welded tube technology to armor stainless steel with the thickness of 0.1-0.2mm for the wire, and then twists a plurality of wires with the stainless steel armor, the force-bearing section with the structure solves the contradiction between easy bending and breaking resistance, but the section is elastically deformed into a spiral line from a straight line state forcibly in the process of twisting into a cable, because the section with an armor layer is manufactured by utilizing a composite material continuous pultrusion technology, because the continuous fiber materials impregnated with resin must be cured in a cavity die, and the continuous fiber materials impregnated with resin can move relative to the cavity die in the curing process, if the cross section shape, the size or the space shape of the cavity die is deformed in the relative movement process, the relative movement is inevitably unsmooth or even stopped, and the curing process of the resin with low viscosity viscous flow state, gel state or glass state cannot be controlled technically, so that the preparation of the continuous deformation composite material section cannot be realized.
On the other hand, in the method for preparing the continuous fiber composite material section bar in the prior art, the continuous fiber material which is generally called prepreg and is impregnated with resin is only passively filtered by the edge of the die opening of the extrusion forming die or a preposed glue filtering device when the continuous fiber material is pulled into the extrusion forming die, so that the volume ratio of the resin in the cured and formed section bar often exceeds the requirement of the actual product performance, namely the key performance indexes such as the strength, the winding characteristic and the like of the composite material section bar under the condition of a given sectional area are reduced, and the cost and the weight of the product are increased.
Disclosure of Invention
In order to solve the problems, the invention provides the continuous linear resin-based fiber reinforced prepreg, and by utilizing the preparation method, the continuous deformation composite material section bar can be continuously prepared, and the availability of the continuous deformation composite material section bar can ensure the requirement of composite material value engineering design which needs to synthesize various performance requirements.
The technical scheme of the invention is that the preparation method of the continuous deformation composite material section comprises the following steps of:
s1, impregnating continuous longitudinal fibers with resin to obtain a prepreg, and continuously welding or extruding metal to obtain a pipe blank. The preparation of the prepreg and the preparation of the tube blank may be performed simultaneously or not.
S2, continuously bringing the prepreg into the tube blank to obtain a material to be deformed, wherein in the step, the prepreg can be fully filled or not fully filled at the inlet of the tube blank, and under the condition of full filling, part of redundant resin in the prepreg is extruded. In the case of non-pack, a portion of the excess resin in the prepreg is left in the tube blank or flows out of the tube blank in a trickle, which in any case allows initial control of the volume ratio relationship of the continuous longitudinal fibers and resin.
S3, synchronously driving the prepreg and the pipe blank of the material to be deformed, changing the section of the pipe blank through a drawing or rolling process or/and deforming the space shape of the pipe blank through a die to obtain continuous materials to be formed with the same or different space shapes, wherein the size and the shape of the section of the pipe blank (the cross section which is vertical to the longitudinal direction of continuous longitudinal fibers) can be changed, the shape can be made into a circle, an ellipse, a gourd shape or a polygon, wherein the polygon can be an equilateral polygon, an unequal polygon, a convex polygon or a concave polygon, in the step, the space shape of the pipe blank can be linear, can be changed into a two-dimensional plane curve type such as a plane wave type, or a three-dimensional space curve type such as a spiral line type, and because the prepreg and the pipe blank are synchronously driven, the section and/or space shape of the material to be formed can be deformed differently in different sections to form a shape tube with a continuous whole, but different section shapes or areas and different section space shapes.
And S4, heating the material to be molded to obtain continuous deformation composite material profiles with the same or different space forms, wherein the continuous deformation composite material profiles comprise core materials formed by cross-linking and curing the prepreg and armor layers formed by deforming the tube blank, the step can be immediately executed in the same place after the step S3, and can also be executed in the same place or other places at intervals of a certain time to finally form a metal tube of the armor layer of the profile, the metal tube exists as a cavity die required by curing and molding the prepreg in the step, and the cavity die has the functions of limiting bubbles generated in the cross-linking and curing process, removing the bubbles and accurately extruding redundant resin.
Preferably, the method further comprises a step S5 of disassembling the armor layer to obtain a bare core material. By appropriate temperature control and selection of the composition of the metallic material, the armour layer can be stripped from the outer surface of the core, which is also actually a continuous deformed composite profile, but in the present invention, for clarity of description, the continuous deformed composite profile is first a linear continuous re-entrant material containing metallic armour layers, whether or not they are contained, which can be wound into a coil for packaging, storage, transport, installation and use.
It is to be noted that the "continuous" aspect of the invention is intended to emphasize that the above-described method is suitable for the production of composite profiles which can be extended theoretically infinitely, and therefore differs from the production of elongate composite profiles using a fixed cavity mould which is moved relative to the prepreg. The "deformation" described in the present invention is intended to emphasize that the above method is not only suitable for preparing all linear continuous composite material profiles with the same cross-sectional shape and size, which can be prepared in the prior art, but also suitable for preparing continuous multi-core material profiles with different cross-sectional shapes and/or spatial shapes, and is not limited to be only suitable for preparing continuous multi-core material profiles with different cross-sectional shapes and/or spatial shapes. The "profile" described in the present invention is intended to emphasize that the above-described process is suitable for the preparation of various continuous composite materials with constant section characteristics, including cables, whether they contain no metal armouring layer.
Preferably, the method further comprises the step of S6, recycling the removed armor layer as metal required for S1 welding or extrusion. Through the recycling, the energy saving property, the environmental protection property and the simplicity of the preparation process of the continuous deformation composite material section bar can be further improved.
Preferably, the linear speed of the prepreg brought into the tube blank is equal to the linear speed of the metal welding or extrusion molding tube blank, so that the prepreg and the tube blank are kept relatively static from entering the tube blank.
Preferably, the cross-sectional shape of the material to be molded in step S3 includes one or more of a circle, an ellipse, a gourd shape, and a polygon, and the spatial form of the material to be molded includes one or more of a linear type, a two-dimensional plane curve type, and a three-dimensional space curve type.
Preferably, the volume of the continuous longitudinal fibers in the material to be molded accounts for 60-80% of the total volume of the prepreg. Further preferably, the volume fraction of the continuous longitudinal fibers can be controlled to be 75% to 80%.
Preferably, the continuous longitudinal fibers comprise one or more of glass fibers, carbon fibers, boron fibers, aramid fibers, silicon carbide fibers and basalt fibers.
Because of the achievement of the method, the invention also provides a cable type continuous deformation composite material section which has a curved space shape and can be coiled, and the cable type continuous deformation composite material section comprises a core material and an armor layer, wherein the armor layer is attached to the outer surface of the core material, the core material comprises continuous longitudinal fibers and resin, the volume of the continuous longitudinal fibers accounts for 60-80% of the total volume of the core material, and the armor layer material comprises at least one layer of metal. Further preferably, the volume fraction of the continuous longitudinal fibers may be controlled to be 75% to 80%. Compared with the composite material section bar with the curve space form in the prior art, the continuous deformation composite material cable provided by the invention is a continuous deformation composite material cable which can be infinitely extended theoretically.
Preferably, the spatial form of the cable type continuous deformation composite material section bar comprises one or two of a two-dimensional plane curve type and a three-dimensional space curve type, the cross section shape of the cable type continuous deformation composite material section bar comprises one or more of a circle, an ellipse, a gourd shape and a polygon, and the cross sections at different positions are the same or different in size.
Since the armor layer of the cable type continuous deformation composite material section can be removed, the invention also provides a naked continuous deformation composite material section which has a curved space shape and can be coiled, and comprises a core material, wherein the core material comprises continuous longitudinal fibers and resin, and the volume of the continuous longitudinal fibers accounts for 60-80% of the total volume of the core material. Further preferably, the volume fraction of the continuous longitudinal fibers may be controlled to be 75% to 80%. Compared with the composite material section bar with the curve space form in the prior art, the continuous deformation composite material cable provided by the invention is a continuous deformation composite material cable which can be infinitely extended theoretically.
Preferably, the tensile strength of the cable-type continuous deformation composite material section or the exposed continuous deformation composite material section is 1200-4000MPa, and the linear expansion coefficient is 0.6-8 × 10-61/DEG C, and the elastic modulus is 120-240 GPa.
The manufacturing process of the continuous deformation composite material section bar in the scheme is that resin is used for impregnating continuous longitudinal fibers to obtain prepreg, and metal is continuously welded or extruded to obtain a tube blank; continuously introducing the prepreg into the tube blank to obtain a material to be deformed, wherein the linear speed of the prepreg introduced into the tube blank is equal to the linear speed of the metal welding or extrusion molding tube blank so as to ensure that the prepreg keeps relatively static with the tube blank from entering the tube blank, at the moment, the prepreg is subjected to a first section of pressure at the opening of the tube blank, part of redundant resin in the prepreg is extruded under the condition that the prepreg is fully plugged, and under the condition that the prepreg is not fully plugged, part of redundant resin in the prepreg is left in the tube blank or flows out of the tube blank in a vertical flow mode so as to control the volume ratio of continuous longitudinal fibers and resin, and after part of resin is discharged, the prepreg enters the tube blank; the prepreg and the tube blank of the material to be deformed are synchronously driven by the prior driving device, the tube blank is rolled or drawn to form a tube with a designed section, the transverse section of the tube blank is reduced, namely the shell of the material to be formed can be made into a circular shape, an oval shape, a gourd shape or a polygon under the action of the second stage of rolling or drawing pressure, the size and the shape of the section (the cross section which is vertical to the longitudinal direction of the continuous longitudinal fiber) of the tube blank can be changed, wherein the polygon can be an equilateral polygon, an unequal polygon, a convex polygon or a concave polygon, as the tube blank is rolled or drawn for one or more times, the tube diameter is reduced, the prepreg in the tube is soaked, and the air and the redundant resin mixed in are extruded again, so that the volume ratio of the fiber in the tube is improved and further controlled, on the other hand, at the moment, the pipe and the prepreg are relatively static and are pulled to be synchronously driven, and the spatial form of the pipe blank can be linear, can also be changed into a two-dimensional plane curve type such as a plane wave type or a three-dimensional space curve type such as a spiral line type under the action of a die or other pressure, and because the prepreg and the pipe blank are synchronously driven, the section and/or the spatial form of the material to be formed can be subjected to different deformation treatments in different sections, so that the whole body is continuous, but the section shapes or the areas are different, and the spatial forms of the different sections are different; then, heating the material to be molded, and triggering the prepreg in the pipe to complete crosslinking and curing to obtain continuous deformed composite material profiles with the same or different spatial forms; the continuous deformation composite material section comprises a core material formed by crosslinking and curing the prepreg and an armor layer formed by deforming the tube blank, the armor layer can be disassembled to be suitable for different occasions, and the armor layer can be reserved to protect the core material.
The continuous deformation composite material section prepared by the scheme can be used as an overhead conductor of a power transmission and distribution line, a force-bearing power transmission conductor of an electric railway, a contact network conductor, a prestress cable of civil engineering and the like.
The existing pultrusion technology is as follows: the air and the redundant resin that mix are extruded to the fibre of impregnating resin at the entrance of chamber mould make the fibre volume content in the chamber mould reach the design requirement to loop through the preparation that the three heating warm area (infiltration, gel, solidification) of chamber mould accomplished the goods, the technical process of this application is: in the process of changing the pipe blank into the pipe by drawing, the mixed air and redundant resin are extruded out by the fiber of the impregnated resin at the inlet of the cavity die, so that the volume content of the fiber in the cavity die reaches the design requirement, meanwhile, the prepreg and the pipe are always kept relatively static, and the continuous deformation of the sectional material is realized.
The invention has the beneficial effects that:
1. the prepreg is subjected to two-stage extrusion to squeeze out redundant resin, only the volume content of the resin required to play a bonding role is reserved, the volume ratio of continuous longitudinal fibers is improved, key performance indexes such as the strength and the winding characteristic of the composite material profile under the condition of a given sectional area are increased, the content of the resin in the profile is reduced, and the price of the product is reduced.
2. In the scheme, after the prepreg enters the tube blank, the tube blank is rolled or drawn into a forming tube, in the process, except that the tube blank deforms to cause the prepreg in the tube blank to deform so that redundant resin is extruded and slightly moves, the whole prepreg and the tube blank do not move relatively, on one hand, the tube blank is rolled or drawn into the forming tube to apply pressure to the prepreg inside, resin bubbles are prevented from being generated and redundant resin is extruded, on the other hand, the prepreg and the tube blank or the forming tube are synchronously driven, after the tube blank is rolled or drawn into a desired space form forming tube, heating is carried out, and prepreg crosslinking and curing are triggered. Compared with the method for curing the prepreg by cross-linking while moving relative to the cavity die in the prior art, the prepreg of the scheme starts to be combined and finish the curing process in the shaped tube relatively and statically, and the feasibility of continuous deformation of the composite material section including the section shape, the size and the space form is realized.
3. The armor layer of the section prepared by the scheme can be selectively reserved or removed, and the continuous deformation composite section without the armor layer prepared by the scheme can avoid the contradiction of easy bending and bending loss resistance.
4. In the scheme, metal is used for forming a pipe blank, a pipe tube and an armor layer, and the metal plays a role in combining prepreg and primarily controlling the volume ratio of continuous longitudinal fibers and the volume ratio of resin in the pipe blank stage; in the process of deforming the pipe blank into a shaped pipe, the pipe blank further extrudes the prepreg to complete the functions of exhausting, extruding glue and the like; after the prepreg is formed into a pipe, the prepreg plays a role of a cavity mold for resin curing forming when being heated to trigger and complete the crosslinking and curing process of the prepreg; and in the final continuous deformation composite material section, the continuous deformation composite material section plays a role in protecting the armor of the inner composite material.
5. Because the prepreg and the pipe blank or the pipe do not move relatively in the scheme, on one hand, the surface defect of the prepreg material generated by the relative movement of the prepreg in the cavity film in the prior art is avoided, the product quality is improved, and the production cost is reduced, on the other hand, the problem that the curing process of the low-viscosity viscous state, the gel state or the glass state resin cannot be controlled due to the unsmooth or even stop of the relative movement of the prepreg and the cavity film is avoided, and therefore the continuous deformation of the composite material section bar can be realized.
6. On one hand, due to the fact that the prepreg does not move relative to the pipe blank or the pipe, any problem of difficulty in section bar preparation caused by mutual friction is avoided, on the other hand, after the pipe blank is formed into the pipe, the prepreg inside the pipe and the pipe are linear or expected spiral line-shaped space curves, the prepreg can enter a cross-linking curing stage at fixed time and fixed point, compared with the method that in the prior art, a cavity film is fixed, the prepreg moves in the cavity film while completing the curing process, the section bar production in the scheme is flexible in process, the preparation speed is greatly improved, and the process production efficiency is improved.
Drawings
FIG. 1 is a flow chart of a process for preparing a continuous fiber composite profile in the prior art;
FIG. 2 is a schematic view of a process flow for preparing a continuous deformation composite material section bar in the present scheme;
in the figure: 12. continuous longitudinal fibers; 9. a resin; 13. a metal; 7. a welding machine; 8. a pipe blank; 6. rolling or drawing a die; 2. continuously deforming the composite profile; 3. a traction device; 5. a heating device; 111. and heating the curing device.
Detailed Description
In order to make the present invention more comprehensible, the technical solutions of the present invention are further described below with reference to specific embodiments, but the present invention is not limited thereto.
Example 1
A method for preparing a continuous deformation composite material profile 2, as shown in fig. 2, comprises the following steps in sequence:
s1, impregnating a resin 9 with continuous longitudinal fibers 12 to obtain a prepreg, wherein the raw material contains 50 parts of the continuous longitudinal fibers 12 and 50 parts of the resin 9, and the continuous longitudinal fibers 12 comprise a mixture of glass fibers and carbon fibers; radially forming the metal 13 through a guide roller and a longitudinal covering die and welding the metal 13 through a continuous welding machine 7 to obtain a tube blank 8;
s2, discharging the prepreg and continuously feeding the prepreg into the tube blank 8 to obtain a material to be deformed, wherein the linear speed of the prepreg taken into the tube blank 8 is equal to the linear speed of the metal 13 welded or extruded to form the tube blank 8 in the step S1, the prepreg is fully filled at the inlet of the tube blank 8, and part of redundant resin 9 in the prepreg is discharged and extruded;
s3, synchronously driving the prepreg of the material to be deformed and the tube blank 8 through the traction device 3, changing the section of the tube blank 8 through a drawing or rolling process or/and deforming the spatial form of the tube blank 8 through the action of a mold to obtain continuous materials to be formed with the same or different spatial forms, wherein the volume of continuous longitudinal fibers 12 in the materials to be formed accounts for 60-80% of the total volume of the prepreg, at the moment, the tube blank 8 and the prepreg are relatively static, the rolling or drawing mold 6 changes the size or the shape of the section of the tube blank 8, the section shape can be made into a circle, an ellipse, a gourd shape or a polygon, wherein the polygon can be an equilateral polygon, an unequal-sided polygon, a convex polygon, a concave polygon and the like, and the spatial form of the tube blank 8 is deformed through the action of the mold, such as a one-dimensional linear type and a two-dimensional plane wave type, or three-dimensional space curve type such as spiral type;
s4, heating the material to be molded through a heating device 5 to obtain the continuous deformation composite material section bar 2 with the same or different space forms, wherein the continuous deformation composite material section bar comprises a core material formed by cross-linking and curing the prepreg and an armor layer formed by deforming the tube blank 8;
and winding the composite material section into a disc through a winding device.
Example 2
A method for preparing a continuous deformation composite material profile 2, as shown in fig. 2, comprises the following steps in sequence:
s1, impregnating a resin 9 with continuous longitudinal fibers 12 to obtain a prepreg, wherein the raw material contains 30 parts of the continuous longitudinal fibers 12 and 50 parts of the resin 9, and the continuous longitudinal fibers 12 comprise a mixture of boron fibers, aramid fibers and silicon carbide fibers; radially forming a metal strip 13 through a guide roller and a longitudinal covering die and welding the metal strip through a continuous welding machine 7 to obtain a tube blank 8;
s2, discharging the prepreg and continuously feeding the prepreg into the tube blank 8 to obtain a material to be deformed, wherein the linear speed of the prepreg taken into the tube blank 8 is equal to the linear speed of the metal 13 welded or extruded to form the tube blank 8 in S1, and under the condition that the prepreg is not fully filled, part of redundant resin 9 in the prepreg is left in the tube blank 8 or flows out of the tube blank 8 in a vertical flow mode;
s3, synchronously driving the prepreg of the material to be deformed and the tube blank 8 through the traction device 3, changing the section of the tube blank 8 through a drawing or rolling process or/and deforming the space shape of the tube blank 8 through the action of a die to obtain continuous materials to be formed with the same or different space shapes, wherein the volume of continuous longitudinal fibers 12 in the materials to be formed accounts for 60% -80% of the total volume of the prepreg, at the moment, the tube blank 8 and the prepreg are relatively static, the rolling or drawing die 6 changes the section size and shape of the tube blank 8, the section shape can be made into a circle, an ellipse, a gourd shape or a polygon, wherein the polygon can be an equilateral polygon, an unequal-sided polygon, a convex polygon, a concave polygon and the like, and the space shape of the tube blank 8 is deformed through the action of the die, such as a one-dimensional linear type and a two-dimensional plane wave type, or three-dimensional space curve type such as spiral type;
s4, heating the material to be molded by the heating device 5 to obtain the continuous composite material section 2 with the same or different space forms, wherein the tensile strength is 1200-4000MPa, and the linear expansion coefficient is 0.6-8 multiplied by 10-6 1/DEG C, the elastic modulus is 120-240GPa, and the continuous deformation composite material section bar 2 comprises a core material formed by crosslinking and curing the prepreg and an armor layer formed by deforming the tube blank 8;
s5, removing the armor layer to obtain the bare core material. The dismantling method can be a mechanical dismantling method;
and finally, winding the composite material section into a disc through a winding device.
Example 3
A method for preparing a continuous deformation composite material profile 2, as shown in fig. 2, comprises the following steps in sequence:
s1, impregnating continuous longitudinal fibers 12 with resin 9 to obtain a prepreg, wherein the raw material contains 40 parts of continuous longitudinal fibers 12 and 50 parts of resin 9, and the continuous longitudinal fibers 12 comprise a mixture of silicon carbide fibers and basalt fibers; radially forming a metal strip 13 through a guide roller and a longitudinal covering die and welding the metal strip through a continuous welding machine 7 to obtain a tube blank 8;
s2, discharging the prepreg and continuously feeding the prepreg into the tube blank 8 to obtain a material to be deformed, wherein the linear speed of the prepreg taken into the tube blank 8 is equal to the linear speed of the metal 13 welded or extruded to form the tube blank 8 in the step S1, the prepreg is fully filled at the inlet of the tube blank 8, and part of redundant resin 9 in the prepreg is discharged and extruded;
s3, synchronously driving the prepreg of the material to be deformed and the pipe blank 8 through the traction device 3, changing the section of the pipe blank 8 through drawing or rolling process or/and deforming the space shape of the pipe blank 8 through the action of a die to obtain continuous material to be formed with the same or different space shapes, wherein the volume of the continuous longitudinal fibers 12 in the material to be formed accounts for 75% -80% of the total volume of the prepreg, the pipe blank 8 and the prepreg are relatively static, the section size and shape of the pipe blank 8 are changed through the rolling or drawing die 6, the section shape can be round, oval, gourd-shaped or polygonal, wherein the polygon can be equilateral polygon, unequal-sided polygon, convex polygon, concave polygon and the like, and the space shape of the pipe blank 8, such as one-dimensional linear type polygon, Two-dimensional plane wave type, or three-dimensional space curve type such as spiral line type;
s4, heating the material to be molded by the heating device 5 to obtain the continuous composite material section 2 with the same or different space forms, wherein the tensile strength is 1200-4000MPa, and the linear expansion coefficient is 0.6-8 multiplied by 10-6 1/DEG C, modulus of elasticity of120-240GPa, wherein the continuous deformation composite material section bar 2 comprises a core material formed by crosslinking and curing the prepreg and an armor layer formed by deforming the tube blank 8.
S5, removing the armor layer to obtain the bare core material. The removal may be by mechanical removal.
S6, recycling the removed armor layer as the metal 13 required by welding or extruding in the step S1, wherein the recycling step can comprise melting after mechanical removal to serve as an extruded metal raw material; or taken off and coiled as a welded metal strip.
And winding the composite material section into a disc through a winding device.
Example 4
The cable type continuous deformation composite material section bar prepared according to the method is characterized by having a curved space shape, being capable of being coiled, and comprising a core material and an armor layer, wherein the armor layer is attached to the outer surface of the core material, the core material comprises continuous longitudinal fibers and resin, the volume of the continuous longitudinal fibers accounts for 60% -80% of the total volume of the core material, and the armor layer material comprises at least one layer of metal. The section shapes of the core materials comprise one or more of a circle, an ellipse, a gourd-shaped shape and a polygon, the section sizes of different positions are the same or different, and the curve space forms comprise one or two of a two-dimensional plane curve form and a three-dimensional space curve form.
Example 5
The exposed continuous deformation composite material section prepared according to the method is characterized by having a curved space shape and being capable of being coiled and comprising a core material, wherein the core material comprises continuous longitudinal fibers and resin, and the volume of the continuous longitudinal fibers accounts for 60-80% of the total volume of the core material. The section shapes of the core materials comprise one or more of a circle, an ellipse, a gourd-shaped shape and a polygon, the section sizes of different positions are the same or different, and the curve space forms comprise one or two of a two-dimensional plane curve form and a three-dimensional space curve form. The tensile strength is 1200-4000MPa, and the linear expansion coefficient is0.6-8×10-61/DEG C, and the elastic modulus is 120-240 GPa.
Comparative example 1
In the prior art, as shown in fig. 1, mixed air and redundant resin 9 are extruded out of continuous longitudinal fibers 12 impregnated with resin 9 at an inlet of a cavity die under the driving of traction, so that the volume content of the continuous longitudinal fibers 12 in the cavity die reaches the design requirement, the continuous longitudinal fibers are infiltrated, gelled and cured sequentially through three heating temperature zones of the cavity die, and the product is manufactured by traction of a traction device, wherein a heating and curing device 111 is the cavity die, and the product is required to be cured in the cavity die and move relatively, so that the manufacture of a continuous deformation composite material section with deformable cross section and space shape cannot be realized.
Specific embodiments of the present invention have been described above in detail. In conclusion, the method can be used for continuously preparing the continuous deformation composite material section, and the availability of the continuous deformation composite material section can ensure the value engineering design requirement of the composite material which needs to synthesize various performance requirements.
It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, any technical solutions that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments in the prior art based on the inventive concept should be within the scope of the present invention.
Claims (5)
1. A continuous linear resin-based fiber reinforced prepreg is characterized in that the preparation method comprises the following steps in sequence:
s1, impregnating continuous longitudinal fibers (12) with resin (9) to obtain a prepreg, and continuously welding or extruding metal (13) to obtain a pipe blank (8);
s2, continuously bringing the prepreg into the tube blank (8) to obtain a material to be deformed;
s3, synchronously driving the prepreg of the material to be deformed and the tube blank (8), changing the section of the tube blank (8) through a drawing or rolling process or/and deforming the spatial form of the tube blank (8) through the action of a die to obtain continuous materials to be formed with the same or different spatial forms.
2. A continuous linear resin based fibre reinforced prepreg according to claim 1, wherein the linear speed at which the prepreg is brought into the tubular blank (8) is the same as the linear speed at which the metal (13) is welded or extruded to form the tubular blank (8).
3. The continuous linear resin-based fiber reinforced prepreg according to claim 1, wherein the cross-sectional shape of the material to be molded in step S3 comprises one or more of a circle, an ellipse, a gourd and a polygon, and the spatial form of the material to be molded comprises one or more of a linear form, a two-dimensional plane curve form and a three-dimensional space curve form.
4. A continuous linear resin based fibre reinforced prepreg according to claim 1, wherein the volume of the continuous longitudinal fibres (12) in the material to be formed is between 60% and 80% of the total volume of the prepreg.
5. A continuous linear resin based fibre reinforced prepreg according to claim 1, wherein the continuous longitudinal fibres (12) comprise one or more of glass fibres, carbon fibres, boron fibres, aramid fibres, silicon carbide fibres, basalt fibres.
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| CN202010710421.9A CN111805944B (en) | 2020-07-22 | 2020-07-22 | Continuous deformation composite material section bar and preparation method thereof |
| CN202110641112.5A CN113370559B (en) | 2020-07-22 | 2020-07-22 | Continuous linear resin-based fiber reinforced prepreg |
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| CN113715367B (en) * | 2021-07-16 | 2022-08-09 | 北京科技大学 | Tubular beam part and preparation process thereof |
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- 2020-07-22 CN CN202010710421.9A patent/CN111805944B/en active Active
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113352651B (en) | 2022-06-24 |
| CN113370559A (en) | 2021-09-10 |
| WO2022017106A1 (en) | 2022-01-27 |
| CN111805944A (en) | 2020-10-23 |
| CN113352651A (en) | 2021-09-07 |
| WO2022017105A1 (en) | 2022-01-27 |
| CN111805944B (en) | 2021-05-07 |
| WO2022016747A1 (en) | 2022-01-27 |
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