CN111271527A - Carbon fiber-PMI composite pipeline and preparation method thereof - Google Patents
Carbon fiber-PMI composite pipeline and preparation method thereof Download PDFInfo
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- CN111271527A CN111271527A CN202010141401.4A CN202010141401A CN111271527A CN 111271527 A CN111271527 A CN 111271527A CN 202010141401 A CN202010141401 A CN 202010141401A CN 111271527 A CN111271527 A CN 111271527A
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- 239000002131 composite material Substances 0.000 title claims abstract description 42
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 27
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Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L9/00—Rigid pipes
- F16L9/16—Rigid pipes wound from sheets or strips, with or without reinforcement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D23/00—Producing tubular articles
- B29D23/001—Pipes; Pipe joints
-
- 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
- B32B1/00—Layered products having a non-planar shape
- B32B1/08—Tubular products
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/12—Layered products comprising a layer of synthetic resin next to a fibrous or filamentary layer
-
- 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
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
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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
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a 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
- 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
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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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
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/045—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/54—Yield strength; Tensile strength
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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
- B32B2597/00—Tubular articles, e.g. hoses, pipes
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Laminated Bodies (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
The invention provides a carbon fiber-PMI composite pipeline and a preparation method thereof, the carbon fiber-PMI composite pipeline comprises a pipe wall and a hollow cavity, the pipe wall is formed by winding and compounding at least three carbon fiber layers and at least two PMI films, the inner side and the outer side of each PMI film are the carbon fiber layers, the basal layer and the skin layer of the pipe wall are the carbon fiber layers, and the thickness of the PMI film is not more than 1 mm. According to the invention, the carbon fiber-PMI composite material with a multilayer sandwich structure is used as the pipe wall to construct a hollow pipeline structure, so that the formed pipeline structure has excellent specific rigidity, specific strength and corrosion resistance. The internal space of the hollow pipe cavity of the carbon fiber-PMI composite pipeline provided by the invention can be reasonably utilized to accommodate parts in the same design, and on the other hand, the outer wall of the carbon fiber-PMI composite pipeline can also provide a protection effect for the parts arranged in the hollow pipe cavity, so that the possibility of collision, erosion and illumination aging of the parts is reduced, and the service life of the parts is prolonged.
Description
Technical Field
The invention belongs to the field of composite materials, and particularly relates to a carbon fiber-PMI composite pipeline and a preparation method thereof.
Background
The carbon fiber is a special fiber consisting of carbon elements and has the characteristics of high temperature resistance, friction resistance, electric conduction, heat conduction, corrosion resistance and the like. The carbon fiber is fibrous and soft, and may be produced into various kinds of fabric, and has graphite microcrystal structure with preferred orientation along fiber axis and thus high strength and modulus along fiber axis direction. The carbon fibers have a low density and thus a high specific strength and a high specific modulus. In the prior art, the main purpose of carbon fiber is to compound carbon fiber with foam, resin, metal, ceramic, carbon and the like as a reinforcing material to manufacture advanced composite materials.
Polymethacrylimide foam (PMI) is a cross-linked foam with a uniform pore size distribution, excellent structural stability and high mechanical strength. PMI has higher specific strength, specific modulus, heat and humidity resistance, and better high temperature creep resistance and dimensional stability than other polymer foam materials. PMI is the foam material with the highest specific strength (strength/density) and specific modulus (modulus/density) in the world at present, has excellent high-temperature resistance and dimensional stability, and is an ideal core material for manufacturing the light-weight high-strength composite material pipe wall. In addition, because the PMI has high closed pore rate, uniform pore size distribution and low moisture absorption rate, the sandwich composite material as the core material has durability and environmental resistance which are far superior to those of a honeycomb composite material.
However, PMI, as a rigid foam, is not flexible at normal temperatures, and this property limits the use of PMI for the construction of shaped structures. In the prior art, if the PMI needs to be compounded on the surface of a curved substrate or a bent substrate, a PMI plate generally needs to be attached to the substrate or a mold at a high temperature to prepare a PMI preform having a special-shaped profile, or a cutting instrument is adopted to cut the surface of the PMI according to the required special-shaped profile. In the PMI preforming method described above: the former generally requires the use of an additional preforming mold having a specific shape, and the investment of the preforming mold increases the production cost; the latter requires editing of specific surface machining parameters according to actual machining requirements, and this preforming method is not suitable for continuous mass production, and generates lots of scraps, resulting in waste of raw materials and scrap disposal or recycling processes. In addition, the PMI preforms produced by the above-described methods have low flexibility and versatility and can only be matched to a particular mold or substrate.
Disclosure of Invention
The invention aims to provide a carbon fiber-PMI composite pipeline and a preparation method thereof, so as to obtain a composite pipeline with good mechanical property.
According to an aspect of the present invention, there is provided a carbon fiber-PMI composite conduit: including the pipe wall and the cavity body, its pipe wall is rolled up by at least three-layer carbon fiber layer and at least two-layer PMI membrane and covers the complex and form, and the inboard and the outside of every layer of PMI membrane are the carbon fiber layer, and the stratum basale and the skin layer of pipe wall are the carbon fiber layer, and the thickness of PMI membrane is no more than 1mm
The carbon fiber-PMI composite material with a multilayer sandwich structure is used as the pipe wall to construct a hollow pipeline structure, so that the formed pipeline structure has excellent specific rigidity, specific strength and corrosion resistance, and can be widely applied to various structural designs in multiple fields. In practical application, the internal space of the hollow pipe cavity of the carbon fiber-PMI composite pipe provided by the invention can be reasonably utilized to accommodate parts in the same design, and on the other hand, the outer wall of the carbon fiber-PMI composite pipe can also provide a protection effect for the parts placed in the hollow pipe cavity, so that the possibility of collision, erosion and illumination aging of the parts is reduced, and the service life of the parts is prolonged.
Preferably, the PMI film is made of 100% PMI.
Preferably, the thickness of the PMI film does not exceed 0.3 mm.
Different from the traditional PMI plate, the PMI film with the thickness not more than 1mm has certain crimpability at normal temperature, and the PMI film is used as a core layer material for preparing the composite material pipeline, so that the outline of the PMI film attached to the base material can be directly compounded outside the base material, and the PMI film produced in batches can be flexibly applied to the composite material pipelines with various shapes. In addition, compared with the compounding between thick plates, the compounding of the thin layers has larger interlayer binding force, the interlayer binding is tighter, the delamination is not easy to happen, and the integration and the mechanical property of the pipeline are improved. By utilizing the excellent mechanical property of the PMI, in the pipe wall formed by the mutual alternate compounding of the PMI film and the carbon fiber film, the PMI film plays a role in supporting and reinforcing the carbon fiber layer, so that the pipe wall has high tensile resistance and pressure resistance. In the pipe wall, the thickness of each layer of PMI film is smaller, so that the pipeline can have higher mechanical strength in a composite mode of multiple layers of PMI films, the outer diameter of the pipeline cannot be obviously increased, and the limitation of the application scene of the pipeline caused by the increase of the outer diameter is avoided.
Preferably, the PMI film is spirally compounded on the periphery of the inner carbon fiber layer thereof.
Preferably, the shape of the pipe is vertical pipe shape, arc pipe shape or bending pipe shape. The pipeline with the geometric center of any radial section being on the same straight line can be called a vertical pipeline, the pipeline with the center of gravity being outside the pipe body and without a bent structure can be called an arc pipeline, and the pipeline with the pipe body comprising at least one bent corner can be called a bent pipeline.
Be spiral helicine compound mode and make the PMI membrane adapt to the substrate of different shapes better to can closely laminate with the surface of substrate, avoid the produced dead angle position of compound PMI membrane, can make various integrated into one piece's heterotypic pipeline from this, especially be the pipy pipeline of buckling, need not to set up the breakpoint in the department of buckling, avoided breakpoint department because the stress concentration of different degree and make the pipeline produce uncontrollable deformation and crackle.
Optionally, the PMI film is directly wrapped around the carbon fiber layer on the inner side thereof. Direct coating means that the PMI film is directly coated on the periphery of the carbon fiber layer in a cigarette-like manner.
According to another aspect of the present invention, there is provided a method for preparing the carbon fiber-PMI composite pipe, comprising the steps of: s1, winding and covering carbon fibers on the surface of a mandrel mould to serve as a substrate layer; s2, at normal temperature, the PMI film and the carbon fiber layer are wound on the periphery of the substrate layer to form a sandwich structure on the periphery of the substrate layer, and the sandwich structure is a multilayer sandwich structure containing at least two layers of PMI films; s3, winding a carbon fiber layer on the periphery of the sandwich structure to form a skin layer; s4, shaping and compounding adjacent layered structures forming the pipe wall; and S5, removing the mandrel mould to obtain the carbon fiber-PMI composite pipeline.
Preferably, in S3, the PMI film is wound around the periphery of the carbon fiber layer on the adjacent inner side thereof in a spirally wound manner.
Optionally, in S3, the operation of winding the PMI film is specifically: coating viscose on the periphery of the carbon fiber layer wound on the mandrel die, and then, spirally winding the PMI film on the periphery of the carbon fiber layer at normal temperature.
Optionally, in S3, the operation of winding the PMI film is specifically: pre-soaking the PMI film in the viscose, and then, spirally winding the PMI film with the surface covered with the viscose on the periphery of the carbon fiber layer wound on the mandrel mould at normal temperature.
In the preparation process, the PMI film produced in batch can be directly covered on the surface of the base material under the condition of normal temperature, a heating device or a mechanical cutting device is not required to be additionally arranged for performing the PMI plate, the manufacturing process of the composite material related to the PMI core layer material is simplified, the manufacturing period of the composite material is shortened, the manufacturing cost and the energy consumption of the composite material are reduced, and the improvement of the production speed and the yield are facilitated.
Drawings
FIG. 1 is a schematic view of the natural state three-dimensional structure of a PMI plate and a PMI film at normal temperature;
FIG. 2 is a schematic view showing a PMI film wound and compounded on a carbon fiber layer in the process of manufacturing a vertical pipe according to example 1;
FIG. 3 is a schematic view showing the overall structure and interlayer structure of the vertical pipe manufactured in example 1;
FIG. 4 is a schematic cross-sectional view of a carbon fiber-PMI composite pipe produced in comparative example 2
Fig. 5 is a schematic view of a vertical pipe with a square cross section manufactured in example 2, in which a PMI film is directly coated and compounded on a carbon fiber layer;
FIG. 6 is a schematic view showing the overall structure and interlayer structure of the arc-shaped duct manufactured in example 3;
fig. 7 is a schematic view of the overall structure of the three-side bent pipe manufactured in example 4.
The correspondence of each reference numeral in the above figure is as follows: the method comprises the following steps of 1, PMI plates, 2, a carbon fiber layer, 3, a PMI film layer, 4, a PMI inner core and 5, a straight rod type die.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.
In describing the preferred embodiment which is illustrated in the drawings, specific terminology may be resorted to for the sake of clarity; however, it is not intended that the disclosure herein be limited to the specific terminology so selected; and it is to be understood that each specific element includes all equivalent techniques that perform the same function, operate in a similar manner, and achieve a similar result.
Example 1
The main materials are as follows: carbon fiber, PMI film.
Acquisition mode of PMI film: PMI sheet 1 was cut into a PMI film having a thickness of 0.2 mm. As shown in fig. 1, the PMI sheet material 1 before cutting is a hard sheet material, which does not have bendability and crimpability at normal temperature, and the cut PMI film has a certain crimpability at normal temperature when the thickness thereof reaches 1mm or less, and can be crimped into a roll web having a certain toughness as shown in fig. 1, however, the material nature thereof is not changed, that is, the PMI film retains excellent structural stability and mechanical strength peculiar to PMI.
Preparing a vertical pipeline:
s1, coating a release agent on the surface of a straight rod type mold 5 with a circular cross section, attaching the mold to the surface of the mold, and winding the mold by using carbon fibers to construct a first carbon fiber layer 2 serving as a substrate layer of a pipe wall;
s2. extension of sandwich structure
S2.1, coating resin on the surface of a carbon fiber layer 2 serving as a substrate layer, and winding the carbon fiber layer on the periphery of the substrate layer to construct 2 carbon fiber layers 2 on the periphery of the substrate layer;
s2.2, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, as shown in FIG. 2, adhering and winding a PMI film on the periphery of the carbon fiber layer 2, and constructing 1 PMI film layer 3 on the periphery of the outermost carbon fiber layer 2 of the semi-finished product, wherein the formed PMI film layer 3 has spiral lines;
s2.3, coating resin on the surface of the outermost PMI film layer 3 of the semi-finished product prepared in the previous step, and adhering and winding carbon fibers on the periphery of the PMI film layer 3, so that 1 carbon fiber layer 2 is built on the periphery of the semi-finished product;
s2.4 repeating S2.2-S2.3 three times;
s3, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, attaching carbon fibers and winding the carbon fibers on the periphery of the semi-finished product, and thus constructing 1 carbon fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of a pipe wall;
s4, ultraviolet irradiation is carried out to enable the resin adhered with each layered structure to be crosslinked and cured, so that the tube wall is shaped, and in other embodiments, the resin can be crosslinked and cured in a heating mode;
and S5, removing the straight rod-shaped mold to obtain the vertical pipeline.
The vertical pipeline manufactured in this embodiment is a pipeline structure with a circular cross section, an inner diameter of 1cm, and a total thickness of the pipe wall of 1.6mm to 1.7mm, an overall structure and an interlayer structure of the pipe wall thereof are respectively shown in fig. 3, and the interlayer structure of the pipe wall is as follows: 3 carbon fiber layers 2-1 PMI membrane layers 3-1 carbon fiber layers 2-1 PMI membrane layers 3-2 carbon fiber layers 2. Because each layer of the pipe wall is compounded on the periphery of the base material in a winding mode by adopting continuous materials, the pipe wall surface of the vertical pipe manufactured by the embodiment has no obvious interlayer joint. In practical applications, the number of layers of the core structure and the thickness of each layered structure may be adjusted within an appropriate range as needed.
Comparative example 1
The main materials are as follows: carbon fiber, PMI film.
Acquisition mode of PMI film: similarly to example 1, PMI plates were used as a starting material, and a PMI film having a thickness of 0.2mm, which had a certain crimpability at ordinary temperature, was obtained by cutting.
Preparing a vertical pipeline:
s1, coating a release agent on the surface of a straight rod type mold 5 with a circular cross section, attaching the mold to the surface of the mold, and winding the mold by using carbon fibers to construct a first carbon fiber layer 2 serving as a substrate layer of a pipe wall;
s2. extension of sandwich structure
S2.1, coating resin on the surface of a carbon fiber layer 2 serving as a substrate layer, and winding the carbon fiber layer on the periphery of the substrate layer to construct 3 carbon fiber layers 2 on the periphery of the substrate layer;
s2.2, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, and utilizing a PMI film to adhere and wind the surface of the semi-finished product, so that 4 layers of PMI film layers 3 are constructed on the periphery of the semi-finished product;
s2.3, coating resin on the surface of the outermost PMI film layer 3 of the semi-finished product prepared in the previous step, and adhering and winding carbon fibers on the periphery of the semi-finished product, so that 3 carbon fiber layers 2 are constructed on the periphery of the semi-finished product;
s3, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, attaching carbon fibers and winding the carbon fibers on the periphery of the semi-finished product, and constructing 1 carbon fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of a pipe wall;
s4, ultraviolet irradiation is carried out to enable the resin adhered with each layered structure to be crosslinked and cured, so that the tube wall is shaped, and in other embodiments, the resin can be crosslinked and cured in a heating mode;
and S5, removing the straight rod-shaped mold to obtain the vertical pipeline.
The vertical pipeline manufactured in the embodiment is a pipeline structure with a circular cross section, an inner diameter of 1cm and a total thickness of a pipe wall of 1.6 mm-1.7 mm, and the interlayer structure of the pipe wall is as follows: 4 carbon fiber layers 2-4 PMI film layers 3-4 carbon fiber layers 2.
Comparative example 2
The main materials are as follows: carbon fiber, PMI sheet 1.
Preparation of solid vertical rod-like structure:
s1, milling the PMI plate 1 into a cylindrical structure with the bottom surface radius of 0.5cm by using a cutting instrument to serve as a PMI inner core 4;
s2, coating resin on the periphery of the PMI inner core 4, and winding carbon fibers on the periphery of the PMI inner core 4 to form a first carbon fiber layer 2;
s3, coating resin on the periphery of the first carbon fiber layer 2, and winding carbon fibers on the periphery of the first carbon fiber layer 2 to form a second carbon fiber layer 2;
s4, repeating the step S3 for six times until the eighth carbon fiber layer 2 is constructed;
s5, ultraviolet irradiation is carried out to enable the resin adhered to each layered structure to be crosslinked and cured, so that the pipe wall is shaped, and in other embodiments, the resin can be crosslinked and cured in a heating mode, so that the solid vertical rod-shaped structure is obtained.
The solid vertical rod-shaped structure prepared in this example is a pipeline structure with a circular cross section, the diameter of the PMI inner core 4 is 1cm, and the total thickness of the rod wall is 1.6 mm-1.7 mm, as shown in fig. 4, the rod core is a PMI plate 1, and the interlayer structure of the rod wall is composed of 8 carbon fiber layers 2.
Comparative example 3
The main materials are as follows: carbon fiber
Preparing a vertical pipeline:
s1, coating a release agent on the surface of a straight rod type mold 5 with a circular cross section, attaching the mold to the surface of the mold, and winding the mold by using carbon fibers to construct a first carbon fiber layer 2 serving as a substrate layer of a pipe wall;
s2, coating resin on the surface of the carbon fiber layer 2 serving as a substrate layer, and winding the carbon fiber on the periphery of the foam core material to form a first carbon fiber layer 2;
s3, coating resin on the periphery of the first carbon fiber layer 2, and winding carbon fibers on the periphery of the first carbon fiber layer 2 to form a second carbon fiber layer 2;
s4, repeating S3 for ten times until the construction of the twelfth carbon fiber layer 2 is completed;
s5, ultraviolet irradiation is carried out to enable the resin adhered with each layered structure to be crosslinked and cured, so that the tube wall is shaped, and in other embodiments, the resin can be crosslinked and cured in a heating mode;
and S6, removing the straight rod-shaped mold to obtain the vertical pipeline.
The vertical pipeline manufactured in the embodiment is a pipeline structure with a circular cross section, an inner diameter of 1cm and a total thickness of a pipe wall of 1.6 mm-1.7 mm, and an interlayer structure of the pipe wall is composed of 12 carbon fiber layers 2.
Test example
In the present example, a pressure-bearing test was set with the carbon fiber-PMI composite vertical pipes produced in example 1, comparative example 2, and comparative example 3 as test subjects.
The experimental setup was as follows:
in this embodiment, four experimental groups are set, one kind of reference object is one experimental group, each experimental group is set with 5 repetitions, and each reference object is one repetition. Two quartering points respectively positioned at two ends of a tube body of the test object are used as stress points, acting forces with the same magnitude and downward directions are respectively applied to the test object on the two stress points, and the minimum value of the unilateral acting force capable of pressing off the test object is used as the pressure bearing limit of the test object.
Results of the experiment
The pressure-bearing limits corresponding to the reference objects in the embodiment are shown in table 1, and are arranged according to the size of the pressure-bearing limit: example 1 > comparative example 2 > comparative example 3. From the pressure-bearing experimental tests of this embodiment, it can be derived: the pressure bearing limit of the carbon fiber vertical pipeline prepared in the comparative example 3 is the minimum value of all the reference objects, so that the fact that the PMI and the carbon fiber can mutually support and reinforce in the composite material prepared by compounding the PMI and the carbon fiber film is proved, and the composite material can achieve stronger mechanical strength compared with the independent action of the PMI and the carbon fiber film; however, as for the material of the PMI, the PMI of comparative example 2 was used as the solid core material, and therefore the material amount of the PMI of the solid vertical rod-shaped structure manufactured in comparative example 2 was certainly the largest among all the reference objects, and it was confirmed that the mechanical strength of the composite material can be effectively improved while saving the material of the PMI by compounding the carbon fiber and the PMI in a sandwich form; comparing the pressure bearing limits of the reference objects manufactured in the embodiment 1 and the comparative embodiment 1, the wall thicknesses of the two reference objects, the types of the layered structures forming the tube wall and the corresponding layer numbers are the same, and only the arrangement modes of the layered structures are different, however, the pressure bearing limit of the reference object manufactured in the embodiment 1 is obviously higher than that of the reference object manufactured in the comparative embodiment 1, so that for the PMI-carbon fiber composite material in a sandwich structure, the more the number of the layers is, the greater the interlayer bonding force between the thin layers in the composite material is, and the closer the interlayer bonding is, so that the composite material has greater mechanical strength.
TABLE 1 limiting value of pressure bearing for each of the test subjects of this example
Example 2
The main materials are as follows: carbon fiber, PMI film.
Acquisition mode of PMI film: similarly to example 1, PMI plates were used as a starting material, and a PMI film having a thickness of 0.3mm, which had a certain crimpability at ordinary temperature, was obtained by cutting.
Pretreatment mode of carbon fiber: carbon fibers are made into carbon fiber prepregs.
Preparing a vertical pipeline:
s1, coating a release agent on the surface of a straight rod type mold 5 with a square cross section, attaching the mold to the surface of the mold, paving a carbon fiber prepreg on the surface of the mold, constructing a carbon fiber layer 2 to serve as a pipe wall substrate of a pipe wall, and using the constructed first carbon fiber layer 2 as the pipe wall substrate;
s2. extension of sandwich structure
S2.1, coating resin on the surface of a carbon fiber layer 2 serving as a substrate layer, and paving carbon fiber prepreg on the periphery of the substrate layer, so that 1 carbon fiber layer 2 is constructed on the periphery of the substrate layer;
s2.2, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, and enabling a PMI film to be directly wrapped and attached to the periphery of the semi-finished product through operation similar to cigarettes as shown in figure 5, and constructing 1 PMI film layer 3 on the periphery of the semi-finished product;
s2.3, coating resin on the surface of the outermost PMI film layer 3 of the semi-finished product prepared in the previous step, and paving carbon fiber prepreg on the periphery of the semi-finished product, so that 2 carbon fiber layers 2 are constructed on the periphery of the semi-finished product;
s2.4 repeating S2.2-S2.3 once;
s3, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, paving carbon fiber prepreg on the periphery of the semi-finished product, and constructing 1 carbon fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of a pipe wall;
s4, heating to enable the resin adhered to each layered structure to be crosslinked and cured, so that the tube wall is shaped, and in other embodiments, the resin can be crosslinked and cured in an ultraviolet irradiation mode;
and S5, removing the straight rod-shaped mold to obtain the vertical pipeline.
The vertical pipeline manufactured in the embodiment is a pipeline structure with a square cross section and a total thickness of the pipe wall of 1.3 mm-1.6 mm, and the interlayer structure of the pipe wall is as follows: 2 carbon fiber layers 2-1 PMI film layers 3-3 carbon fiber layers 2. In practical applications, the number of layers of the core structure and the thickness of each layered structure may be adjusted within an appropriate range as needed.
Example 3
The main materials are as follows: carbon fiber, PMI film.
Acquisition mode of PMI film: similarly to example 1, PMI plates were used as a starting material, and a PMI film having a thickness of 1mm, which had a certain crimpability at ordinary temperature, was obtained by cutting.
Pretreatment mode of carbon fiber: carbon fibers are made into carbon fiber prepregs.
Pre-treatment of PMI films: PMI films were pre-soaked in liquid high-energy glue.
Preparing an arc pipeline:
s1, coating a release agent on the surface of an arc rod-shaped mould with a circular cross section, attaching the release agent to the surface of the mould, and paving a carbon fiber prepreg on the surface of the mould, wherein a first carbon fiber layer 2 constructed by the method is used as a substrate layer of a pipe wall;
s2. expansion of pipe wall
S2.1, coating resin on the surface of a carbon fiber layer 2 serving as a substrate layer, and paving carbon fiber prepreg on the periphery of the substrate layer, so that 1 carbon fiber layer 2 is constructed on the periphery of the substrate layer;
s2.2, attaching the outline of the semi-finished product prepared in the previous step, and winding the PMI film on the periphery of the semi-finished product, so that 1 layer of PMI film layer 3 is constructed on the periphery of the semi-finished product;
s2.3, attaching the contour of the semi-finished product prepared in the previous step, and paving carbon fiber prepreg on the periphery of the semi-finished product, so as to construct 1 carbon fiber layer 2 on the periphery of the semi-finished product;
s2.4 repeating S3.2-S3.3 twice;
s3, coating resin on the surface of the outermost carbon fiber layer 2 of the semi-finished product prepared in the previous step, paving carbon fiber prepreg on the periphery of the semi-finished product, and constructing 1 carbon fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of a pipe wall;
s4, heating to enable the resin bonded with each core layer to be crosslinked and cured, so that the tube wall is shaped, and in other embodiments, the resin can be crosslinked and cured in an ultraviolet irradiation mode;
and S5, removing the arc rod-shaped mold to obtain the arc pipeline.
The arc-shaped pipeline manufactured in the embodiment is a pipeline structure with a circular cross section and a total thickness of a pipe wall of 3.6 mm-3.9 mm, the overall structure of the pipeline is shown in fig. 6, and the interlayer structure of the pipe wall is as follows: 2 carbon fiber layers 2-1 PMI film layers 3-1 carbon fiber layers 2-1 PMI film layers 3-2 carbon fiber layers 2. In practical applications, the number of layers of the core structure and the thickness of each layered structure may be adjusted within an appropriate range as needed.
Example 4
The main materials are as follows: carbon fiber, PMI film.
Acquisition mode of PMI film: similarly to example 1, PMI plates were used as a starting material, and a PMI film having a thickness of 0.8mm, which had a certain crimpability at ordinary temperature, was obtained by cutting.
Pretreatment modes of carbon fibers and PMI films: carbon fibers and PMI films were pre-soaked in a liquid high-energy glue.
Preparing a three-side bent pipeline:
s1, the mold adopted in the embodiment is a triangular mold which is built by combining 3 straight rods with circular cross sections through connecting pieces, a mold release agent is coated on the surface of the mold, the surface of the mold is attached, carbon fibers are wound on the mold, and a first carbon fiber layer 2 constructed in the way is used as a substrate layer of a pipe wall;
s2. expansion of pipe wall
S2.1, attaching the contour of the periphery of the substrate layer prepared in the previous step, and winding carbon fibers on the periphery of the semi-finished product, so that 1 carbon fiber layer 2 is constructed on the periphery of the semi-finished product;
s2.2, attaching the outline of the semi-finished product prepared in the previous step, and winding the PMI film on the periphery of the semi-finished product, so that 1 layer of PMI film layer 3 is constructed on the periphery of the semi-finished product;
s2.3, attaching the contour of the semi-finished product prepared in the previous step, and winding carbon fibers on the periphery of the semi-finished product, so that 2 carbon fiber layers 2 are constructed on the periphery of the semi-finished product;
s2.4 repeating S3.2-S3.3 twice;
s3, attaching the contour of the semi-finished product prepared in the previous step, winding carbon fibers on the periphery of the semi-finished product, and constructing 1 carbon fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of the pipe wall;
s4, irradiating by ultraviolet light to enable the resin adhered to each layered structure to be crosslinked and cured, so that the tube wall is shaped, and in other embodiments, the resin can be crosslinked and cured in a heating mode;
s5, removing the arc rod-shaped mold from the opening of the pipeline to obtain the arc pipeline.
The three-edge bent pipeline manufactured in this embodiment has no pipe break point at the bent position, and is a pipeline structure with a circular cross section and a total pipe wall thickness of 3.3 mm-3.5 mm, the overall structure of the pipeline structure is shown in fig. 6, and the interlayer structure of the pipe wall is as follows: 2 carbon fiber layers 2-1 PMI membrane layers 3-3 carbon fiber layers 2. In practical applications, the number of layers of the core structure and the thickness of each layered structure may be adjusted within an appropriate range as needed.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the true spirit and scope of the present invention.
Claims (10)
1. A carbon fiber-PMI composite conduit, characterized by: including the pipe wall and the cavity body of well, its pipe wall is rolled up by at least three-layer carbon fiber layer and at least two-layer PMI membrane and covers the complex and form, every layer the inboard and the outside of PMI membrane are carbon fiber layer, just the stratum basale and the skin layer of pipe wall are carbon fiber layer, the thickness of PMI membrane is no longer than 1 mm.
2. The carbon fiber-PMI composite conduit of claim 1 wherein: the PMI film was made of 100% PMI.
3. The carbon fiber-PMI composite conduit of claim 2 wherein: the thickness of the PMI film is not more than 0.3 mm.
4. The carbon fiber-PMI composite conduit of claim 1 wherein: the PMI film is spirally wound around the outer periphery of the carbon fiber layer on the inner side thereof.
5. The carbon fiber-PMI composite conduit of claim 4 wherein: the shape of the pipe is vertical pipe shape, arc pipe shape or bending pipe shape.
6. The carbon fiber-PMI composite conduit of claim 1 wherein: the PMI film is directly coated on the periphery of the carbon fiber layer at the inner side of the PMI film.
7. A method for preparing a carbon fiber-PMI composite conduit according to any one of claims 1 to 6, comprising the steps of:
s1, winding and covering the carbon fiber layer on the surface of a mandrel mould to be used as a substrate layer;
s2, at normal temperature, the PMI film and the carbon fibers are wound on the periphery of the substrate layer to form a sandwich structure on the periphery of the substrate layer, and the sandwich structure is a multilayer sandwich structure containing at least two layers of the PMI film;
s3, winding the carbon fiber layer on the periphery of the sandwich structure to form the skin layer;
s4, shaping and compounding adjacent layered structures forming the pipe wall;
and S5, removing the mandrel mould to obtain the carbon fiber-PMI composite pipeline.
8. The method of claim 7, wherein: in S3, the PMI film is wound around the periphery of the carbon fiber layer on the inside thereof in a spirally wound manner.
9. The method according to claim 8, wherein in S3, the operation of winding the PMI film is specifically: coating viscose glue on the outer side of the carbon fiber layer, and then, spirally winding the PMI film on the carbon fiber layer at normal temperature.
10. The method according to claim 8, wherein in S3, the operation of winding the PMI film is specifically: pre-soaking the PMI film in viscose, and then, spirally winding the PMI film with the surface covered with the viscose on the carbon fiber layer at normal temperature.
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| CN202010141401.4A CN111271527A (en) | 2020-03-04 | 2020-03-04 | Carbon fiber-PMI composite pipeline and preparation method thereof |
| PCT/CN2020/078142 WO2021174519A1 (en) | 2020-03-04 | 2020-03-06 | Carbon fiber-pmi composite pipeline and preparation method therefor |
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| CN114134481B (en) * | 2021-12-23 | 2024-07-23 | 湖南金博碳素股份有限公司 | Pipe forming die and preparation method of carbon/carbon composite pipe |
| CN115433302A (en) * | 2022-10-08 | 2022-12-06 | 成都雷隐科技有限公司 | Preparation method of modified GMI material |
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