CN111319312A - Metal fiber-PMI composite pipeline and preparation method thereof - Google Patents
Metal fiber-PMI composite pipeline and preparation method thereof Download PDFInfo
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- CN111319312A CN111319312A CN202010141521.4A CN202010141521A CN111319312A CN 111319312 A CN111319312 A CN 111319312A CN 202010141521 A CN202010141521 A CN 202010141521A CN 111319312 A CN111319312 A CN 111319312A
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Abstract
The invention provides a metal fiber-PMI composite pipeline and a preparation method thereof, wherein the metal fiber-PMI composite pipeline comprises a pipe wall and a hollow cavity, the pipe wall is formed by winding and compounding at least three metal fiber layers and at least two PMI films, the inner side and the outer side of each PMI film are both metal fiber layers, a basal layer and a skin layer of the pipe wall are both metal fiber layers, and the thickness of the PMI film is not more than 1 mm. The metal 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. In practical application, the internal space of the hollow pipe cavity of the metal fiber-PMI composite pipe provided by the invention can be reasonably utilized to accommodate parts in the same design, and in addition, the outer wall of the metal 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.
Description
Technical Field
The invention belongs to the field of composite materials, and particularly relates to a metal fiber-PMI composite pipeline and a preparation method thereof.
Background
The metal fiber is a fiber-shaped material which has high metal content and metal materials which are continuously distributed and have the transverse dimension of micron order. The metal fiber has good mechanical property, not only has higher fracture specific strength and tensile specific modulus, but also can resist bending and has good toughness; has good conductivity and can prevent static electricity. Such as: the tungsten fiber is used as a filament of an incandescent bulb, is also an important material for preventing electromagnetic radiation, conducting and transmitting electric signals, and has high temperature resistance; stainless steel fiber, gold fiber, nickel fiber and the like also have good chemical corrosion resistance, and are not easy to oxidize in the air; the aluminum fiber can control the radar wave transmittance, resist external severe conditions and protect the inner base material.
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 metal 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 metal fiber-PMI composite pipe: comprises a pipe wall and a hollow cavity, wherein the pipe wall is formed by at least three metal fiber layers and at least two layers of PMI films in a winding and compounding way, the inner side and the outer side of each layer of PMI film are metal fiber layers, the basal layer and the skin layer of the pipe wall are metal fiber layers, and the thickness of the PMI film is not more than 1mm
The metal 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, corrosion resistance and special electrical property, 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 metal 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 metal 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 metal fiber layer contains at least one of tungsten fibers, nickel fibers, stainless steel fibers, gold fibers, silver fibers, copper fibers, and aluminum fibers. The metal fiber layer can be selected based on the specific electrical characteristics of different metal fibers, so that the prepared composite pipeline has excellent electrical characteristics such as electromagnetic radiation resistance, electromagnetic wave transmittance control, good broadband wave absorption characteristic and the like, and has wide application value in the fields of military affairs, aviation, communication, confidential shielding environment and the like.
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 metal fiber film, the PMI film plays a role in supporting and reinforcing the metal 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 metal fiber layer on the inner side 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 metal fiber layer on the inner side thereof. Direct wrapping means that the PMI film is directly wrapped on the periphery of the metal fiber layer in a cigarette-like manner.
According to another aspect of the present invention, there is provided a method for preparing the metal fiber-PMI composite pipe, comprising the steps of: s1, winding and covering metal fibers on the surface of a mandrel mould to serve as a substrate layer; s2, at normal temperature, covering the PMI film and the metal fibers on the periphery of the substrate layer in a rolling manner to form a sandwich structure on the periphery of the substrate layer, wherein the sandwich structure is a multilayer sandwich structure containing at least two layers of PMI films; s3, winding metal fibers 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 metal fiber-PMI composite pipeline.
Preferably, in S3, the PMI film is wound around the periphery of the metal 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 glue on the periphery of the metal fiber layer wound on the mandrel die, and then, spirally winding the PMI film on the periphery of the metal fiber film at normal temperature.
Optionally, 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 periphery of the metal fiber layer wound on the mandrel die at normal temperature.
In the preparation process, the PMI films produced in batch can directly cover the surface of the base material at normal temperature, a heating device or a mechanical cutting device is not required to be additionally arranged for performing the PMI plates, 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 production speed and the yield are improved.
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 metal 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 metal fiber-PMI composite pipe produced in comparative example 2
Fig. 5 is a schematic view of the vertical pipe with a square cross section manufactured in example 2, in which a PMI film is directly coated and compounded on a metal 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 process comprises the following steps of 1, PMI plates, 2, a metal 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: aluminum fiber film, 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 an aluminum fiber film to construct a first metal 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 metal fiber layer 2 serving as a substrate layer, and winding the metal fiber layer around the periphery of the substrate layer by using an aluminum fiber film, so that 2 metal fiber layers 2 are constructed on the periphery of the substrate layer;
s2.2, coating resin on the surface of the outermost metal 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 metal fiber layer 2, and constructing 1 PMI film layer 3 on the periphery of the outermost metal 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 an aluminum fiber film on the periphery of the PMI film layer 3, thereby reconstructing 1 metal fiber layer 2 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 metal fiber layer 2 of the semi-finished product prepared in the previous step, attaching an aluminum fiber film and winding the aluminum fiber film on the periphery of the semi-finished product, and thus, 1 metal fiber layer 2 is built on the periphery of the semi-finished product to be used 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 metal fiber layers 2-1 PMI film layers 3-1 metal fiber layers 2-1 PMI film layers 2-1 metal fiber layers 2-1 PMI film layers 3-2 metal 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: aluminum fiber film, 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 an aluminum fiber film to construct a first metal 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 metal fiber layer 2 serving as a substrate layer, and winding the metal fiber layer around the periphery of the substrate layer by using an aluminum fiber film, so that 3 metal fiber layers 2 are constructed on the periphery of the substrate layer;
s2.2, coating resin on the surface of the outermost metal fiber layer 2 of the semi-finished product prepared in the previous step, and utilizing a PMI film to be attached and wound on the periphery 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 utilizing an aluminum fiber film to be attached and wound on the periphery of the semi-finished product, so that 3 metal fiber layers 2 are constructed on the periphery of the semi-finished product;
s3, coating resin on the surface of the outermost metal fiber layer 2 of the semi-finished product prepared in the previous step, attaching an aluminum fiber film and winding the aluminum fiber film on the periphery of the semi-finished product, and thus constructing 1 metal 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 metal fiber layers 2-4 PMI film layers 3-4 metal fiber layers 2.
Comparative example 2
The main materials are as follows: aluminium fibre film, PMI panel 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 the aluminum fiber film on the periphery of the PMI inner core 4 to form a first metal fiber layer 2;
s3, coating resin on the periphery of the first metal fiber layer 2, and winding the aluminum fiber film on the periphery of the first metal fiber layer 2 to form a second metal fiber layer 2;
s4, repeating the step S3 for six times until the eighth metal 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, a PMI inner core 4 with a diameter of 1cm, and a rod wall with a total thickness of 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 metal fiber layers 2.
Comparative example 3
The main materials are as follows: aluminum fiber membrane
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 an aluminum fiber film to construct a first metal fiber layer 2 serving as a substrate layer of a pipe wall;
s2, coating resin on the surface of the metal fiber layer 2 serving as a base layer, and winding an aluminum fiber film on the periphery of a foam core material to form a first metal fiber layer 2;
s3, coating resin on the periphery of the first metal fiber layer 2, and winding an aluminum fiber film on the periphery of the first metal fiber layer 2 to form a second metal fiber layer 2;
s4, repeating S3 for ten times until the construction of the twelfth metal 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 the pipe wall of 1.6 mm-1.7 mm, and the interlayer structure of the pipe wall is composed of 12 metal fiber layers 2.
Test example
In this example, a pressure-bearing test was set with the metal 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 metal fiber vertical pipeline prepared in the comparative example 3 is the minimum value of all the reference objects, so that the fact that in the composite material prepared by compounding the PMI and the metal fiber film, the PMI and the metal fiber can mutually support and reinforce each other is proved, and the composite material can achieve stronger mechanical strength compared with the single action of the PMI and the metal 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 produced in comparative example 2 was certainly the largest among all the test 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 metal fiber and the PMI in a sandwich form; comparing the pressure bearing limits of the reference objects prepared in the embodiment 1 and the comparative embodiment 1, the wall thicknesses of the 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 prepared in the embodiment 1 is obviously higher than that of the reference object prepared in the comparative embodiment 1, so that for the PMI-metal fiber composite material in a sandwich structure, the more the number of the layers of the sandwich is, the larger the interlayer bonding force among the thin layers in the composite material is, and the more the interlayer bonding is, so that the composite material has higher 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: copper fiber film, 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.
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 copper fiber film on the surface of the mold, constructing a metal fiber layer 2 to serve as a pipe wall substrate of a pipe wall, and using the constructed first metal fiber layer 2 as the substrate layer of the pipe wall;
s2. extension of sandwich structure
S2.1, coating resin on the surface of a metal fiber layer 2 serving as a substrate layer, and paving a copper fiber film on the periphery of the substrate layer, so as to construct 1 metal fiber layer 2 on the periphery of the substrate layer;
s2.2, coating resin on the surface of the outermost metal 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 a copper fiber film on the periphery of the semi-finished product, so that 2 metal 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 metal fiber layer 2 of the semi-finished product prepared in the previous step, paving a copper fiber film on the periphery of the semi-finished product, and constructing 1 metal 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 metal fiber layers, 2-1 PMI film layers, 3-2 metal fiber layers, 2-1 PMI film layers and 3-3 metal fiber layers. 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: stainless steel fiber membrane, PMI membrane.
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.
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 stainless steel fiber film on the surface of the mould, wherein a first metal 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 metal fiber layer 2 serving as a substrate layer, and paving a stainless steel fiber film on the periphery of the substrate layer, so as to construct 1 metal fiber layer 2 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 a stainless steel fiber film on the periphery of the semi-finished product, so that 1 metal fiber layer 2 is constructed 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 metal fiber layer 2 of the semi-finished product prepared in the previous step, paving metal fiber prepreg on the periphery of the semi-finished product, and constructing 1 metal 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 metal fiber layers, 2-1 PMI film layers, 3-1 metal fiber layers, 2-1 PMI film layers, 3-2 metal fiber layers. 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: tungsten fiber film, 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 the tungsten fiber film and the PMI film are as follows: the tungsten fiber film and the PMI film are presoaked in 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 to the surface of the mold, a tungsten fiber film is used for winding the mold, and a first metal fiber layer 2 which is built in this 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 the tungsten fiber film on the periphery of the semi-finished product, so that 1 metal 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 outline of the semi-finished product prepared in the previous step, and winding the tungsten fiber film on the periphery of the semi-finished product, so that 2 metal fiber layers 2 are constructed on the periphery of the semi-finished product;
s2.4 repeating S3.2-S3.3 twice;
s3, attaching the outline of the semi-finished product prepared in the previous step, winding a tungsten fiber film on the periphery of the semi-finished product, and constructing 1 metal fiber layer 2 on the periphery of the semi-finished product to serve as a skin layer of a 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 metal fiber layers, 2-1 PMI film layers, 3-3 metal fiber layers and 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 metal fiber-PMI composite conduit, characterized by: including the pipe wall and the cavity body, its pipe wall is rolled up by at least three-layer metal 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 the metal fiber layer, just the stratum basale and the skin layer of pipe wall are the metal fiber layer, the thickness of PMI membrane is no longer than 1 mm.
2. The metal fiber-PMI composite conduit according to claim 1, wherein: the metal fiber layer contains at least one of tungsten fiber, nickel fiber, stainless steel fiber, gold fiber, silver fiber, copper fiber and aluminum fiber.
3. The metal fiber-PMI composite conduit according to claim 2, wherein: the thickness of the PMI film is not more than 0.3 mm.
4. The metal fiber-PMI composite conduit according to claim 1, wherein: the PMI film is spirally wound around the periphery of the metal fiber layer on the inner side thereof.
5. The metal fiber-PMI composite conduit according to claim 4, wherein: the shape of the pipe is vertical pipe shape, arc pipe shape or bending pipe shape.
6. The metal fiber-PMI composite conduit according to claim 1, wherein: the PMI film is directly coated on the periphery of the metal fiber layer at the inner side of the PMI film.
7. A method for preparing a metal fiber-PMI composite conduit according to any one of claims 1 to 6, comprising the steps of:
s1, winding and covering metal fibers on the surface of a mandrel mould to form a metal fiber layer serving as a substrate layer;
s2, at normal temperature, the PMI film and the metal 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 metal fibers 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 metal fiber-PMI composite pipeline.
8. The method of claim 7, wherein: in S3, the PMI film is wound around the periphery of the metal 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 metal fiber layer, and then, spirally winding the PMI film on the metal 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 metal fiber layer at normal temperature.
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| CN101595335A (en) * | 2006-11-29 | 2009-12-02 | 泡沫塑料加工有限公司 | The duct element that is used for air treatment system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101595335A (en) * | 2006-11-29 | 2009-12-02 | 泡沫塑料加工有限公司 | The duct element that is used for air treatment system |
| CN106147702A (en) * | 2015-04-03 | 2016-11-23 | 深圳光启尖端技术有限责任公司 | A kind of Wave suction composite material and preparation method thereof |
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