CN111361260A - Short carbon fiber composite's production line of cutting - Google Patents
Short carbon fiber composite's production line of cutting Download PDFInfo
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- CN111361260A CN111361260A CN202010269850.7A CN202010269850A CN111361260A CN 111361260 A CN111361260 A CN 111361260A CN 202010269850 A CN202010269850 A CN 202010269850A CN 111361260 A CN111361260 A CN 111361260A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0004—Cutting, tearing or severing, e.g. bursting; Cutter details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/18—Handling of layers or the laminate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/02—Composition of the impregnated, bonded or embedded layer
- B32B2260/021—Fibrous or filamentary layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2260/00—Layered product comprising an impregnated, embedded, or bonded layer wherein the layer comprises an impregnation, embedding, or binder material
- B32B2260/04—Impregnation, embedding, or binder material
- B32B2260/046—Synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2262/00—Composition or structural features of fibres which form a fibrous or filamentary layer or are present as additives
- B32B2262/10—Inorganic fibres
- B32B2262/106—Carbon fibres, e.g. graphite fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
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Abstract
The invention discloses a production line of short carbon fiber composite materials, which comprises the following steps: the device comprises a main conveying device, an auxiliary conveying device and a cutting device, and further comprises a fiber dispersing device, wherein the fiber dispersing device is installed right below the cutting device and is used for dispersing the chopped carbon fiber bundles cut by the cutting device into single-thread short fibers. According to the production line of the short carbon fiber composite material, the fiber dispersing device is additionally arranged behind the short carbon fiber cutter, and the short carbon fibers cut by the cutter are directly dispersed into a monofilament state, so that the single carbon fibers are uniformly distributed and bonded with the resin liquid; and compared with the traditional forming process, the tensile property and the bending property of the material are both improved by about 1 time, and the comprehensive performance is excellent.
Description
Technical Field
The invention relates to a carbon fiber composite material, in particular to a production line of a short carbon fiber composite material.
Background
Although carbon fibers are a reinforcing filler which is widely available and used, carbon fiber reinforced polymer composite materials have been widely used in various fields such as missiles, aviation, automobiles, stationery goods, medical devices and the like due to a series of excellent properties such as high specific modulus, high specific strength, corrosion resistance, high temperature resistance and the like.
Carbon fiber SMC materials are, as their name implies, resin impregnated bundles of chopped fibers of equal length, commonly 0.5 inches and 1 inch in length. Recently, carbon fiber composite (SMC) has attracted considerable attention in the field of automotive applications as a new material that is lightweight, strong, and designable. Particularly, with the use of chopped glass fiber sheet materials on trucks, carbon fiber materials are also used on inner and outer ornaments of sports cars and sedans to different degrees.
In the existing carbon fiber SMC material used as automobile interior and exterior trimming parts, the used chopped carbon fibers are directly scattered on release paper coated with a resin matrix on a conveying belt for dispersion after being cut by a cutter on a production line, and then are pressed to obtain the chopped carbon fiber composite material. The chopped carbon fiber composite material is regarded as a quasi-isotropic material in the design process, but because the surface of carbon fibers is large in inertia and is scattered into a resin matrix in batches, the carbon fibers are difficult to uniformly disperse and are usually dispersed in the resin matrix in a bundle shape, so that the material orientation tendency in a local area can be obviously found in the actual production, particularly for large-size workpieces, and the use performance of the ornament is influenced. In addition, due to the limited resin matrix, the resin carbon fiber SMC material is uneven in resin impregnation in the preparation process, is sensitive to temperature, is hard in winter, and is sticky in summer, so that the stability of the service performance of the ornament is influenced.
In order to overcome the defect of poor dispersibility of carbon fibers in a resin matrix, patent document CN 103930473B describes that carbon fiber precursor fibers crimped by interlacing, compressing, and calcining methods are made into a carbon fiber nonwoven fabric, and then the carbon fiber nonwoven fabric is compounded with an impregnating resin to prepare a carbon fiber reinforced composite material. Patent document CN 106279872B describes that carbon fiber is mixed with polymer, and a part of molecular chains of the polymer is grafted to the surface of the carbon fiber by an electron irradiation method or a plasma method, so as to improve the dispersibility of the carbon fiber in the polymer.
Disclosure of Invention
The invention mainly solves the technical problem of providing a production line of short carbon fiber composite materials, which can overcome the defects of improving the dispersion uniformity of carbon fibers in a resin matrix in the prior art.
In order to solve the technical problems, the invention adopts a technical scheme that: the chopped carbon fiber composite material is an isotropic plate and comprises chopped carbon fibers and matrix resin, wherein the chopped carbon fibers are uniformly dispersed in a filiform shape, and the matrix resin liquid uniformly pads the chopped carbon fibers.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a chopped carbon fiber composite production line comprising: the device comprises a main conveying device, an auxiliary conveying device and a cutting device, wherein the main conveying device comprises a main conveying belt, a first resin slurry tank and a first pressing roller, and the first resin slurry tank and the first pressing roller are respectively arranged above and below the main conveying belt along the conveying direction of the main conveying belt; the glue spreading roller of the first resin slurry tank faces the main conveyor belt; the auxiliary conveying device is arranged above the main conveying device and comprises an auxiliary conveying belt, a second resin slurry tank and a second pressing roller; the second pressing roller is positioned above the main conveyor belt and is symmetrically arranged with the first pressing roller, the second resin slurry groove is arranged above the auxiliary conveyor belt, and a glue coating roller of the second resin slurry groove faces the auxiliary conveyor belt; the cutting device is fixed above the main conveying device and is positioned between the first resin slurry tank and the first pressing roller; the device also comprises a fiber dispersing device which is arranged right below the cutting device and is used for dispersing the chopped carbon fiber bundles cut by the cutting device into monofilament-shaped short fibers.
In a preferred embodiment of the invention, the fiber dispersing device comprises an opening unit, a main carding unit and an output roller group which are arranged in sequence along the conveying direction of the chopped carbon fiber bundles; the opening unit comprises an opening cylinder and small barbed rollers symmetrically arranged on two sides of the opening cylinder; the main carding unit comprises a cylinder licker-in, a working roller and a stripping roller; the working roller and the stripping roller are arranged in pair and are connected with the opening cylinder and the cylinder licker-in a rolling way; the output roller group is arranged at the downstream of the rotation direction of the cylinder licker-in.
In a preferred embodiment of the invention, the surfaces of the cylinder licker-in, the working roll and the stripping roll are all wrapped with rigid card clothing.
In a preferred embodiment of the invention, the main conveyor further comprises a set of pressure rollers mounted after the first pressure roller in the direction of transport of the main conveyor.
In a preferred embodiment of the invention, the press roll group comprises an upper roll group and a lower roll group which are symmetrically arranged above and below the main conveyor belt respectively and rotate relatively.
In a preferred embodiment of the invention, each roll of the set of press rolls has a heating device therein.
In a preferred embodiment of the invention, the cutting means is a knife.
In order to solve the technical problem, the invention adopts another technical scheme that: the preparation method of the chopped carbon fiber composite material comprises the following steps:
(1) coating a resin film: respectively introducing first release paper and second release paper from one side of a first resin slurry tank and one side of a second resin slurry tank onto the main conveyor belt and the auxiliary conveyor belt and conveying the first release paper and the second release paper, wherein the coating rollers of the first resin slurry tank and the second resin slurry tank respectively coat uniform resin films on the first release paper and the second release paper;
(2) cutting the bundle-shaped continuous carbon fiber: feeding continuous carbon fiber bundles into a production line at a constant speed, and uniformly cutting the continuous carbon fiber bundles into chopped carbon fiber bundles with required length under the action of the cutting device;
(3) filamentation of bundle-shaped chopped carbon fibers: adjusting the rotating speed of the fiber dispersing device, carding the chopped carbon fiber bundles cut in the step (2) uniformly to disperse the chopped carbon fiber bundles into chopped carbon fiber filaments, and then uniformly and disorderly laying the chopped carbon fiber filaments on the resin film of the first release paper prepared in the step (1);
(4) resin film compounding: the second release paper with the resin film formed in the step (1) is driven by the auxiliary conveyor belt to be compounded with the first release paper through the second compression roller, and is pressed by the first compression roller and the second compression roller to form a sandwich structure of the first release paper, the chopped carbon fibers and the second release paper;
(5) thickening and curing: preheating the temperature of the pressing roller group, and heating and pressurizing the sandwich structure by the pressing roller group under the conveying of the main conveying belt to finish thickening and curing so as to obtain the filamentous chopped carbon fiber composite material.
In a preferred embodiment of the present invention, the rotation speed of the fiber dispersing device is 2 to 4 r/m.
The invention has the beneficial effects that: according to the production line of the short carbon fiber composite material, the fiber dispersing device is additionally arranged behind the short carbon fiber cutter, and the short carbon fibers cut by the cutter are directly dispersed into a monofilament state, so that the single carbon fibers are uniformly distributed and bonded with the resin liquid; and compared with the traditional forming process, the tensile property and the bending property of the material are both improved by about 1 time, and the comprehensive performance is excellent.
Drawings
FIG. 1 is a schematic perspective view of a carbon fiber composite production line in the prior art;
FIG. 2 is a schematic structural view of a chopped carbon fiber composite production line of the present invention;
FIG. 3 is a schematic view of the structure of the fiber dispersion device;
FIG. 4 is an external view of a bundled chopped carbon fiber composite prepared by the prior art;
FIG. 5 is an external view of a filamentous chopped carbon fiber composite prepared according to the present invention;
the parts in the drawings are numbered as follows: 10. the device comprises a main conveying device, 20 parts of an auxiliary conveying device, 30 parts of a cutting device, 40 parts of a fiber dispersing device, 50 parts of first release paper, 60 parts of second release paper, 70 parts of carbon fiber bundles, 11 parts of a main conveying belt, 12 parts of a first resin slurry tank, 13 parts of a first pressing roller, 14 parts of a pressing roller group, 21 parts of an auxiliary conveying belt, 22 parts of a second resin slurry tank, 23 parts of a second pressing roller, 41 parts of an opening unit, 42 parts of a main carding unit, 43 parts of an output roller group, 411 parts of an opening cylinder, 412 parts of a small licker-in, 421 parts of a cylinder licker-in, 422 parts of a working roller and 423 parts of a stripping roller.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
Referring to fig. 1-5, an embodiment of the present invention includes:
the invention discloses a production line of chopped carbon fiber composite materials, which comprises a main conveying device 10, an auxiliary conveying device 20, a cutting device 30 and a fiber dispersing device 40.
The main conveying device 10 comprises a main conveying belt 11 arranged on a conveying roller, a first resin slurry groove 12, a first pressing roller 13 and a pressing roller group 14; wherein the first resin slurry tank 12, the first press roller 13, and the press roller group 14 are arranged in this order along the direction in which the main conveyor belt 11 runs; the first resin slurry tank 12 is disposed with its coating roller 121 facing the side of the main belt 11. The first release paper 50 is introduced into the main conveyor belt 11 from one side of the first resin slurry tank 12, and passes through the first resin slurry tank 12, the first press roller 13 and the press roller group 14 in sequence under the driving of the main conveyor belt 11, and in the process, the resin slurry in the first resin slurry tank 12 is uniformly coated on the surface of the first release paper 50. The upper roller set and the lower roller set of the compression roller set 14 are respectively and symmetrically arranged above and below the main conveyor belt 11 and rotate relatively.
The auxiliary conveying device 20 is arranged above the main conveying device 10 and comprises an auxiliary conveying belt 21 arranged on a conveying roller, a second resin slurry groove 22 and a second pressing roller 23; the second pressing roller 23 is positioned above the main conveyor belt 11 and is symmetrically arranged with the first pressing roller 13, and the first pressing roller 13 and the second pressing roller 23 rotate relatively to realize the rolling function; the second resin slurry tank 22 is fixed with its coating roller 221 facing the horizontal plane of the sub-conveyor 21. The second release paper 60 is introduced into the secondary conveyor belt 21 from one side of the second resin slurry tank 22, and passes through the second resin slurry tank 22 and the second press roller 23 in sequence under the driving of the secondary conveyor belt 21, and in the process, the resin slurry in the second resin slurry tank 22 is uniformly coated on the surface of the second release paper 60.
The cutting device 30 is a cutter, fixed above the main conveyor 10, specifically located between the first resin slurry tank 12 and the first press roller 13, and is configured to cut the carbon fiber bundle into chopped carbon fibers of a desired size at a uniform cutting rate.
The fiber dispersion device 40 includes an opening unit 41, a main carding unit 42, and an output roller group 43; the opening unit 41 comprises an opening cylinder 411 and 2 small licker-in rollers 412, wherein the 2 small licker-in rollers 412 are symmetrically arranged on two sides of the opening cylinder 411, and the opening unit 41 is used for preliminarily decomposing the chopped carbon fibers cut by the cutting unit; the main carding unit 42 comprises a cylinder licker-in 421, a work roll 422 and a stripping roll 423; the working rollers 422 and the stripping rollers 423 are arranged in pairs and are connected with the opening cylinder 411 and the cylinder licker-in 421 in a rolling way, and the surfaces of the cylinder licker-in 421, the working rollers 422 and the stripping rollers 423 of the main carding unit 42 are all wrapped with a layer of rigid card clothing which is used for further dispersing and mixing the fibers transmitted by the opening unit 41 and further dispersing the fibers by adjusting the rotating speed; the output roller set 43 is disposed downstream of the cylinder licker-in 421 in the rotation direction, and is configured to uniformly convey and scatter the monofilament-like staple fibers dispersed by the main carding unit 42 onto the first release paper 50 coated with the resin slurry to form a monofilament-like chopped fiber layer.
The second release paper coated with the resin slurry is combined with the first release paper 50 when being transferred to the second press roll 23, and the sides of the first release paper 50 and the second release paper 60 adhered with the slurry face the chopped carbon fiber layer.
The first pressing roller 13 and the second pressing roller 23 which are symmetrically arranged are used for pressing the conveyed composite layers of the first release paper 50, the chopped carbon fiber layer and the second release paper 60 to form a sandwich structure.
The heating device is arranged in the press roller group 14, the temperature of the press roller group 14 can be adjusted, the press roller group is used for hot-pressing the conveyed sandwich structure, and under the action of pressure and heating, resin in the sandwich structure further permeates into the chopped carbon fiber layer to realize the functions of thickening and curing, so that the chopped carbon fiber composite material finished product is obtained.
Example 1
Unsaturated polyester is used as a resin matrix, carbon fiber with the specification of TC35-12K is selected, and the production line is utilized to prepare carbon fiber with the length of 2.54cm, the resin content of 55 wt% and the gram weight of 450g/m2Referring to the attached figure 2, the specific method steps are as follows:
(1) resin film coating: unsaturated polyester is uniformly mixed in the first resin slurry tank 12 and the second resin slurry tank 22, and a space between coating rollers of the first resin slurry tank 12 and the second resin slurry tank 22 is providedThe gap is 0.2mm, the speed of the conveying roller arranged on the main conveying device 10 and the speed of the conveying roller arranged on the auxiliary conveying device 20 are 4-6 m/min, the first release paper 50 is sent and enters the main conveying belt 11, and a resin film is formed on the surface of the first release paper when the first release paper passes through the first resin slurry groove 12; the second release paper 60 is sent to the auxiliary conveyor belt 21, a resin film is formed on the surface of the second release paper 60 when the second release paper passes through the second resin slurry tank 22, and the gram weight of the resin film on the first release paper 50 and the second release paper 60 is 180g/m2；
(2) Cutting the bundle-shaped continuous carbon fiber: uniformly feeding continuous carbon fiber bundles 70 into a production line at the speed of 2m/min, and uniformly cutting the continuous carbon fiber bundles into chopped carbon fiber bundles with the length of 2.54cm under the action of the cutter;
(3) filamentation of bundle-shaped chopped carbon fibers: adjusting the rotating speed of a cylinder licker-in to be 2-4 r/min, carding the chopped carbon fiber bundles cut in the step (2) into uniformly dispersed chopped carbon fiber yarns through the rotation of the cylinder licker-in, and then uniformly and disorderly laying the chopped carbon fiber yarns on the resin film on the release paper prepared in the step (1);
(4) resin film compounding: the second release paper 60 with the resin film formed in the step (1) is driven by the auxiliary conveyor belt 21 to be compounded with the first release paper 50 through the second press roller 23, and the compounded first release paper 50, second release paper 60 and the chopped carbon fiber filaments clamped between the first release paper and the second release paper are pressed through the first press roller 13 and the second press roller 23 to form a sandwich structure;
(5) thickening and curing: the temperature of the press roll group 14 is set to be 30-50 ℃ in advance, the sandwich structure is heated and pressurized through the press roll group 14 under the transmission of the main conveyor belt 11, resin in the sandwich structure further permeates into the bundle-shaped fibers, the thickening and curing are completed, release paper is removed, and the thread-shaped chopped carbon fiber composite material is obtained through rolling.
And (3) comparison test:
the difference from the embodiment 1 is that after the bundle-shaped continuous carbon fiber is cut, the bundle-shaped continuous carbon fiber is directly and uniformly laid on the resin film on the release paper prepared in the step (1) in disorder without filamentation treatment of a cylinder licker-in; other processes are completely the same as those of the reference 1, and the bundled chopped carbon fiber composite material is prepared as a reference.
From the diagram of the finished chopped carbon fiber composite prepared in this example, it can be seen that: the appearance of the filamentous chopped carbon fiber composite material prepared from the chopped carbon fibers subjected to the filament treatment is in an egg-shaped state, the material is soft in hand feeling, and the resin impregnation and the fiber distribution are relatively uniform; the cut chopped carbon fiber bundles are not dispersed, and the prepared bundled chopped carbon fiber composite material is directly used, wherein the fibers in the bundled chopped carbon fiber composite material are not uniformly distributed, and the resin aggregation phenomenon locally occurs.
Example 2
The bundled chopped carbon fiber composite material and the filamentous chopped carbon fiber composite material prepared in the above examples were respectively passed through a plate sealing mold on a press, and pressed into two flat plates under the condition of 150 ℃/5min/100T, which are respectively labeled as TYPE1 and TYPE 2.
TYPE1 and TYPE2 specimens were cut according to ASTM D3039 and ASTM D7264 and tested for tensile and three-point flexural properties in the 0 ° and 90 ° directions, respectively, comparing the differences in mechanical properties of TYPE1 and TYPE2, with the results shown in the following table.
Tests show that: the material of TYPE1 has larger difference of mechanical properties at 0 degree and 90 degree, and the CV value of a comparative sample force value is larger, while the material of TYPE2 has closer mechanical properties at 0 degree and 90 degree, and the CV value of the comparative sample force value is smaller, which shows that the invention can improve the dispersion uniformity of the bundle-shaped chopped carbon fiber in the forming process by dispersing the bundle-shaped chopped carbon fiber into the monofilament-shaped chopped carbon fiber, thereby obtaining the true quasi-isotropic material.
In addition, compared with the performance of TYPE1, the tensile property and the bending property of TYPE2 prepared by the filamentous dispersed chopped carbon fibers are improved by nearly 1 time compared with TYPE1, which shows that the chopped carbon fiber composite material prepared by the improved method has better mechanical property.
The short carbon fiber composite material prepared by the invention can be used for automobile internal and external ornaments, partial secondary load-bearing structural parts and the like, and can greatly improve the mechanical property of the finished piece on the basis of meeting the customer requirements.
The preparation method and the production line of the chopped carbon fiber composite material have the following advantages:
1. the chopped carbon fibers are uniformly dispersed, so that the phenomenon of local material orientation in the forming process is avoided, the flow dispersion uniformity of the resin matrix is improved, the obtained finished chopped carbon fiber composite material is soft, and the mechanical property is isotropic;
2. compared with the traditional forming process, the tensile property and the bending property of the finished chopped carbon fiber composite material are improved by nearly 1 time, and the comprehensive performance is excellent;
3. the environment change resistance is good, even under hot or wet and cold operating environment, the whole material can still keep flexibility because of even impregnation of the resin matrix, and the operation process is not influenced.
The above-mentioned components are all standard components or components known to the person skilled in the art, the structure and the principle of which are known to the person skilled in the art by means of technical manuals or by means of routine tests.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The chopped carbon fiber composite material is characterized by being an isotropic plate and comprising chopped carbon fibers and matrix resin, wherein the chopped carbon fibers are uniformly dispersed in a filiform shape, and the matrix resin liquid uniformly impregnates the chopped carbon fibers.
2. A chopped carbon fiber composite production line comprising: the device comprises a main conveying device, an auxiliary conveying device and a cutting device, wherein the main conveying device comprises a main conveying belt, a first resin slurry tank and a first pressing roller, and the first resin slurry tank and the first pressing roller are respectively arranged above and below the main conveying belt along the conveying direction of the main conveying belt; the glue spreading roller of the first resin slurry tank faces the main conveyor belt; the auxiliary conveying device is arranged above the main conveying device and comprises an auxiliary conveying belt, a second resin slurry tank and a second pressing roller; the second pressing roller is positioned above the main conveyor belt and is symmetrically arranged with the first pressing roller, the second resin slurry groove is arranged above the auxiliary conveyor belt, and a glue coating roller of the second resin slurry groove faces the auxiliary conveyor belt; the cutting device is fixed above the main conveying device and is positioned between the first resin slurry tank and the first pressing roller; the device is characterized by further comprising a fiber dispersing device, wherein the fiber dispersing device is installed right below the cutting device and used for dispersing the chopped carbon fiber bundles cut by the cutting device into single-thread short fibers.
3. The chopped carbon fiber composite production line of claim 2, wherein said fiber dispersion device includes an opening unit, a main carding unit and an output roller set arranged in sequence along the chopped carbon fiber bundle fiber conveying direction; the opening unit comprises an opening cylinder and small barbed rollers symmetrically arranged on two sides of the opening cylinder; the main carding unit comprises a cylinder licker-in, a working roller and a stripping roller; the working roller and the stripping roller are arranged in pair and are connected with the opening cylinder and the cylinder licker-in a rolling way; the output roller group is arranged at the downstream of the rotation direction of the cylinder licker-in.
4. The chopped carbon fiber composite production line of claim 3, wherein the surfaces of the cylinder licker-in, the work roll and the stripping roll are all wrapped with rigid card clothing.
5. The chopped carbon fiber composite production line of claim 2, wherein said main conveyor further includes a set of compression rollers mounted after said first compression roller in the direction of travel of said main conveyor.
6. The chopped carbon fiber composite production line according to claim 5, wherein the press roll set comprises an upper roll set and a lower roll set, which are symmetrically installed above and below the main conveyor belt respectively and rotate relatively.
7. The chopped carbon fiber composite production line of claim 6, wherein each roll of said nip roll set has a heating device therein.
8. The chopped carbon fiber composite production line of claim 2, wherein said cutting device is a cutter.
9. The preparation method of the chopped carbon fiber composite material is characterized by comprising the following steps of:
(1) coating a resin film: respectively introducing first release paper and second release paper from one side of a first resin slurry tank and one side of a second resin slurry tank onto the main conveyor belt and the auxiliary conveyor belt and conveying the first release paper and the second release paper, wherein the coating rollers of the first resin slurry tank and the second resin slurry tank respectively coat uniform resin films on the first release paper and the second release paper;
(2) cutting the bundle-shaped continuous carbon fiber: feeding continuous carbon fiber bundles into a production line at a constant speed, and uniformly cutting the continuous carbon fiber bundles into chopped carbon fiber bundles with required length under the action of the cutting device;
(3) filamentation of bundle-shaped chopped carbon fibers: adjusting the rotating speed of the fiber dispersing device, carding the chopped carbon fiber bundles cut in the step (2) uniformly to disperse the chopped carbon fiber bundles into chopped carbon fiber filaments, and then uniformly and disorderly laying the chopped carbon fiber filaments on the resin film of the first release paper prepared in the step (1);
(4) resin film compounding: the second release paper with the resin film formed in the step (1) is driven by the auxiliary conveyor belt to be compounded with the first release paper through the second compression roller, and is pressed by the first compression roller and the second compression roller to form a sandwich structure of the first release paper, the chopped carbon fibers and the second release paper;
(5) thickening and curing: preheating the temperature of the pressing roller group, and heating and pressurizing the sandwich structure by the pressing roller group under the conveying of the main conveying belt to finish thickening and curing so as to obtain the filamentous chopped carbon fiber composite material.
10. The method for preparing a chopped carbon fiber composite according to claim 9, wherein the rotation speed of the fiber dispersing device is 2-4 r/min.
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