CN115215583A - LCP composite material with low dielectric constant and preparation method thereof - Google Patents
LCP composite material with low dielectric constant and preparation method thereof Download PDFInfo
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Abstract
The invention particularly relates to an LCP composite material with low dielectric constant and a preparation method thereof, belonging to the field of high polymer materials, wherein the composite material comprises the following components: LCP and functional materials, wherein the functional materials are in a porous structure; the material with a porous structure is used as a functional material for reducing the LCP material, the characteristic that air in the porous structure has a low dielectric constant is utilized, the dielectric constant of the LCP material is reduced, and the problem that the dielectric property of the existing LCP material is poor is solved.
Description
Technical Field
The invention belongs to the technical field of high polymer materials, and particularly relates to an LCP composite material with a low dielectric constant and a preparation method thereof.
Background
5G, fifth generation mobile communication technology. 5G has the characteristics of high speed, low time delay, interconnection of everything and the like. In the 5G application field, the liquid crystal polymer LCP material has the service performance required by 5G, and the development of the LCP material also has a pushing effect on the development of 5G. The 5G communication needs to use a material with a low dielectric constant, and LCP is considered to be one of the most promising polymer materials that can meet the requirements of 5G high frequency applications. Therefore, the modification of the LCP material with low dielectric constant has important research significance.
The modification method commonly used for LCP low dielectric mainly comprises low dielectric polymer blending modification, low dielectric filler filling modification and introduction of a group capable of reducing dielectric constant on a molecular structure. The low dielectric polymer blend modification is mostly achieved by lowering the dielectric properties of the LCP material by virtue of a lower dielectric property material. This method requires replacing low dielectric materials or increasing the amount of modifying materials to reduce the dielectric properties of LCP materials to some extent, and depends on the dielectric properties of the materials themselves. Low dielectric polymers include fluorine-containing polymeric materials such as PTFE and PVDF. Low dielectric fillers include boron carbide, silicon carbide, glass fibers, and the like. Partial groups are introduced into a molecular chain for modification, so that the polarity of the molecule can be changed, and the dielectric constant is larger when the polarity is stronger, and the dielectric constant is smaller when the polarity is weaker. The molecular structure is modified by introducing low-polarity groups, the modification method is complex and difficult to control, the actual modification effect is common, and the space for improving the dielectric property is small. The less polar groups are fluorine groups and methylene groups.
Disclosure of Invention
The application aims to provide the LCP composite material with the low dielectric constant and the preparation method thereof, so as to solve the problem that the dielectric property of the existing LCP material is not good.
The embodiment of the invention provides an LCP composite material with low dielectric constant, which comprises the following components: LCP and functional material, wherein, the functional material is porous structure.
Optionally, the functional material comprises aerogel.
Optionally, the functional material comprises silica aerogel.
Optionally, the composition of the composite material comprises: LCP, functional materials, glass fibers, coupling agents and antioxidants.
Optionally, the composite material comprises the following components in parts by mass: 60-80 parts of LCP, 20-35 parts of functional materials, 5 parts of glass fibers, 0.5-2 parts of coupling agents and 0.5-1 part of antioxidants.
Based on the same inventive concept, the embodiment of the present invention further provides a preparation method of the low dielectric constant LCP composite material, which includes:
obtaining a functional material;
and mixing, melting and granulating the LCP, the functional material, the glass fiber, the coupling agent and the antioxidant to obtain the LCP composite material.
Optionally, the functional material includes silica aerogel, and the obtaining the functional material specifically includes:
dissolving ethyl orthosilicate in a solvent, and mixing with absolute ethyl alcohol to obtain a mixed solution;
adjusting the mixed solution to a set condition, stirring, and then standing;
adding a pore-foaming agent into the mixed solution after standing to obtain silicon dioxide wet gel;
carrying out thermal oxidation aging on the silicon dioxide wet gel to obtain a functional material;
wherein the setting conditions include: the pH value is 3-5, and the temperature is 40-60 ℃.
Optionally, the molar ratio of the tetraethoxysilane to the solvent is 1:3-1:5; and/or
The molar ratio of the ethyl orthosilicate to the absolute ethyl alcohol is 1:4-1:6; and/or
The pH of the set condition is controlled by using a dilute hydrochloric acid solution, and the mass fraction of the dilute hydrochloric acid solution is 5-10%; and/or
The pore-foaming agent comprises polyethylene glycol, and the molar ratio of the pore-foaming agent to tetraethoxysilane is 1:3-1:6.
optionally, adding a pore-forming agent into the mixed solution after standing to obtain the silica wet gel, which specifically includes:
adding a pore-foaming agent into the mixed solution after standing, and then adjusting the mixed solution to a set pH value by adopting ammonia water to obtain silicon dioxide wet gel;
wherein the set pH value is 7-9.
Optionally, the silica wet gel is subjected to thermal oxidation aging to obtain a functional material, and the method specifically includes:
subjecting the silica wet gel to thermo-oxidative aging,
soaking the silica wet gel subjected to thermal oxidative aging in an ethanol solution;
performing supercritical extraction on the silica wet gel soaked in the ethanol solution to obtain a functional material;
wherein the temperature of the supercritical extraction is 35-50 ℃, the pressure of the supercritical extraction is 8-12MPa, and the time of the supercritical extraction is 4-6h.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
according to the LCP composite material with the low dielectric constant, provided by the embodiment of the invention, the material with the porous structure is used as the functional material for reducing the LCP material, the characteristic that air in the porous structure has a low dielectric constant is utilized, the dielectric constant of the LCP material is reduced, and the problem that the dielectric property of the existing LCP material is poor is solved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a flow chart of a method provided by an embodiment of the invention.
Detailed Description
The present invention will be specifically explained below in conjunction with specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly presented thereby. It will be understood by those skilled in the art that these specific embodiments and examples are illustrative of the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically indicated, various raw materials, reagents, instruments, equipment and the like used in the present invention may be commercially available or may be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the present invention, there is provided a low dielectric constant LCP composite, the composition of which comprises: LCP and functional material, wherein, the functional material is porous structure. The pore structure is micron-sized or nano-sized.
Above design adopts the material that is porous structure as the functional material that reduces the LCP material, utilizes the air among the porous structure to have the characteristic of lower dielectric constant, realizes reducing the dielectric constant of LCP material, has solved the current not good problem of LCP material dielectric property.
In some embodiments, the functional material comprises an aerogel.
Aerogels are small in density, light in weight, have extremely high porosity, and are robust. The pore size is strongly related to the pore volume, and on the premise of high porosity, the pore diameter is large, and the pore volume is large, so that the introduced air is large in quantity and large in total volume, and the effect of reducing the dielectric constant of the LCP is better.
The dielectric constant of the silicon dioxide material is not high, and is similar to LCP. Further, the functional material comprises silica aerogel. The dielectric constant of the LCP material can be better reduced.
In some embodiments, the composition of the composite material comprises: LCP, functional materials, glass fibers, coupling agents and antioxidants. Specifically, the composite material comprises the following components in parts by mass: 60-80 parts of LCP, 20-35 parts of functional materials, 5 parts of glass fibers, 0.5-2 parts of coupling agents and 0.5-1 part of antioxidants.
By adopting the proportion, the dielectric constant of the LCP can be reduced by adjusting the addition of the silicon dioxide aerogel on the premise of not influencing the basic service performance of the LCP.
According to another exemplary embodiment of the present invention, there is provided a method for preparing the low dielectric constant LCP composite material, the method comprising:
s1, obtaining a functional material;
in some embodiments, the functional material includes silica aerogel, and the obtaining the functional material specifically includes:
s1.1, dissolving ethyl orthosilicate in a solvent, and mixing with absolute ethyl alcohol to obtain a mixed solution;
specifically, in this embodiment, tetraethoxysilane (TEOS) is added to an appropriate amount of deionized water, and an appropriate amount of anhydrous ethanol is added to an aqueous solution of tetraethoxysilane, so as to obtain a mixed solution.
In some embodiments, the molar ratio of tetraethoxysilane to solvent is 1:3-1:5; the molar ratio of the ethyl orthosilicate to the absolute ethyl alcohol is 1:4-1:6.
the TEOS to alcohol/water ratio is the most critical factor for adjusting the pore size of the aerogel. The reasonable adjustment of the ratio of TEOS to alcohol and water can control the pore size of the silica aerogel to be several nanometers to more than ten nanometers, thereby increasing the introduction amount of air to reduce the dielectric constant.
S1.2, adjusting the mixed solution to set conditions, stirring, and then standing, wherein the set conditions comprise: the pH value is 3-5, and the temperature is 40-60 ℃;
specifically, in this example, a dilute hydrochloric acid solution was added dropwise under stirring (about 500 rpm/min), the pH of the reaction system was adjusted to 3-5, the temperature was raised to 40-60 ℃, and stirring was continued at a speed of about 500rpm/min for 1-3 hours. Standing for about 6h.
In some embodiments, the pH control of the set conditions employs a dilute hydrochloric acid solution having a mass fraction of 5% to 10%.
S1.3, adding a pore-foaming agent into the mixed solution after standing to obtain silicon dioxide wet gel;
in some embodiments, the porogen comprises polyethylene glycol, and in particular, may be selected from PEG200, PEG400, and PEG600. The molar ratio of PEG to TEOS is 1.
In some embodiments, the adding a pore-forming agent to the mixed solution after standing to obtain a silica wet gel specifically includes:
adding a pore-foaming agent into the mixed solution after standing, and then adjusting the mixed solution to a set pH value by adopting ammonia water to obtain silicon dioxide wet gel; wherein the set pH value is 7-9.
Specifically, in this example, after adding an appropriate amount of pore-forming agent polyethylene glycol (PEG) to the mixed solution after standing, ammonia water and water were diluted in a volume ratio of 1.
S1.4, carrying out thermal oxidation aging on the silica wet gel to obtain a functional material;
in some embodiments, the performing thermal oxidative aging on the silica wet gel to obtain a functional material specifically includes:
s1.4.1, carrying out thermal oxidation aging on the silicon dioxide wet gel,
s1.4.2, soaking the silicon dioxide wet gel subjected to thermal oxidation aging in an ethanol solution;
s1.4.3, performing supercritical extraction on the silica wet gel soaked in the ethanol solution to obtain a functional material; wherein the temperature of the supercritical extraction is 35-50 ℃, the pressure of the supercritical extraction is 8-12MPa, and the time of the supercritical extraction is 4-6h.
Specifically, in the present example, the hydrothermal reaction kettle was treated with nitrogen gas, the wet gel was transferred to the hydrothermal reaction kettle, sealed, and dried in a forced air oven at 80-100 ℃ for 48-96 hours. Soaking the silicon dioxide gel after thermal oxidation aging in ethanol solution for 6-8h, and repeatedly soaking for 3 times. Finally, supercritical extraction is carried out for 4-6h at 35-50 ℃ and under the condition of 8-12Mpa to obtain the silicon dioxide aerogel.
S2, mixing, melting and granulating the LCP, the functional material, the glass fiber, the coupling agent and the antioxidant to obtain the LCP composite material.
Specifically, in this example, the aerogel is ground and crushed and passed through a 500-mesh sieve to obtain aerogel fine particles having a uniform particle size. LCP, silicon dioxide aerogel particles, short glass fibers, a silane coupling agent KH570 and an antioxidant 1010 are uniformly mixed by a high-speed mixer according to a certain proportion (mixed for 10min at 1000 rpm/min), and then the mixture is extruded, melted, modified and granulated. An extrusion process: a feeding section: a compression section at 280-295 ℃:290-310 ℃ homogenization section: screw rotation speed at 300-310 ℃:200-250rpm/min.
The low dielectric constant LCP composite of the present application and the method of preparing the same will be described in detail with reference to examples, comparative examples and experimental data.
Example 1
A method for preparing a low dielectric constant LCP composite, the method comprising:
1. adding Tetraethoxysilane (TEOS) into a proper amount of deionized water, wherein the molar ratio of TEOS to deionized water is 1. Standing for 6h, adding a proper amount of a pore-forming agent PEG200, wherein the molar ratio of PEG200 to TEOS is 1. And introducing nitrogen into the hydrothermal reaction kettle for treatment, transferring the wet gel into the hydrothermal reaction kettle, sealing, and drying in a blast oven at 80 ℃ for 48 hours. Soaking the silicon dioxide gel after thermal oxidation aging in ethanol solution for 6h, and repeatedly soaking for 3 times. And finally, performing supercritical extraction for 4 hours at 35 ℃ and 8Mpa to obtain the silicon dioxide aerogel.
2. Grinding and crushing the aerogel and sieving the crushed aerogel with a 500-mesh sieve to obtain aerogel particles with uniform particle size. LCP, silicon dioxide aerogel particles, short glass fibers, a silane coupling agent KH570 and an antioxidant 1010 are uniformly mixed by a high-speed mixer according to a certain proportion, and are mixed for 10min at 1000rpm/min, wherein the formula proportion is as follows: 70 parts of LCP, 25 parts of silica aerogel, 4 parts of short glass fiber, 0.5 part of silane coupling agent KH570 and 0.5 part of antioxidant. Then carrying out extrusion, melting, modification and granulation on the mixture, wherein the extrusion process parameters are as follows: a feeding section, a 280 ℃ compression section, a 290 ℃ homogenization section and a 300 ℃ screw rotating speed: 200rpm/min.
Example 2
A method for preparing a low dielectric constant LCP composite material, the method comprising:
1. adding Tetraethoxysilane (TEOS) into a proper amount of deionized water, wherein the molar ratio of TEOS to deionized water is 1,
dropwise adding a dilute hydrochloric acid solution with the mass fraction of 10% while stirring at 500rpm/min, adjusting the pH of the reaction system to 4, raising the temperature to 45 ℃, and continuing stirring for 1h at the speed of 500 rpm/min. After standing for 6 hours, adding a proper amount of pore-foaming agent PEG200, wherein the molar ratio of PEG200 to TEOS is 1. And (3) introducing nitrogen into the hydrothermal reaction kettle, transferring the wet gel into the hydrothermal reaction kettle, sealing, and drying in a forced air oven at 80 ℃ for 48 hours. Soaking the silicon dioxide gel after thermal oxidation aging in ethanol solution for 6h, and repeatedly soaking for 3 times. And finally, performing supercritical extraction for 4 hours at 35 ℃ and 8Mpa to obtain the silicon dioxide aerogel.
2. Grinding and crushing the aerogel and sieving the crushed aerogel with a 500-mesh sieve to obtain aerogel particles with uniform particle size. LCP, silicon dioxide aerogel particles, short glass fibers, a silane coupling agent KH570 and an antioxidant 1010 are uniformly mixed by a high-speed mixer according to a certain proportion, and are mixed for 10min at 1000rpm/min, wherein the formula proportion is as follows: 70 parts of LCP, 25 parts of silica aerogel, 4 parts of short glass fiber, 0.5 part of silane coupling agent KH570 and 0.5 part of antioxidant. Then the mixture is extruded, melted, modified and granulated, and the extrusion process parameters are as follows: a feeding section, a 280 ℃ compression section, a 290 ℃ homogenization section and a 300 ℃ screw rotating speed: 200rpm/min.
Example 3
A method for preparing a low dielectric constant LCP composite material, the method comprising:
1. adding Tetraethoxysilane (TEOS) into a proper amount of deionized water, wherein the molar ratio of TEOS to deionized water is 1,
dropwise adding a dilute hydrochloric acid solution with the mass fraction of 10% while stirring at 500rpm/min, adjusting the pH of the reaction system to 4, raising the temperature to 45 ℃, and continuing stirring for 1h at the speed of 500 rpm/min. Standing for 6h, adding a proper amount of a pore-foaming agent PEG200, wherein the molar ratio of PEG200 to TEOS is 1. And (3) introducing nitrogen into the hydrothermal reaction kettle, transferring the wet gel into the hydrothermal reaction kettle, sealing the hydrothermal reaction kettle, and drying the hydrothermal reaction kettle for 72 hours at the temperature of 100 ℃ in a blast oven. Soaking the silicon dioxide gel after thermal oxidation aging in ethanol solution for 6h, and repeatedly soaking for 3 times. And finally, performing supercritical extraction for 4 hours at 35 ℃ and 8Mpa to obtain the silicon dioxide aerogel.
2. Grinding and crushing the aerogel and sieving the crushed aerogel with a 500-mesh sieve to obtain aerogel particles with uniform particle size. LCP, silicon dioxide aerogel particles, short glass fibers, a silane coupling agent KH570 and an antioxidant 1010 are uniformly mixed by a high-speed mixer according to a certain proportion, and are mixed for 10min at 1000rpm/min, wherein the formula proportion is as follows: 70 parts of LCP, 25 parts of silicon dioxide aerogel, 4 parts of short glass fiber, 0.5 part of silane coupling agent KH570 and 0.5 part of antioxidant. Then the mixture is extruded, melted, modified and granulated, and the extrusion process parameters are as follows: a feeding section, a 280 ℃ compression section, a 290 ℃ homogenization section and a 300 ℃ screw rotating speed: 200rpm/min.
Example 4
A method for preparing a low dielectric constant LCP composite material, the method comprising:
1. adding Tetraethoxysilane (TEOS) into a proper amount of deionized water, wherein the molar ratio of TEOS to deionized water is 1,
dropwise adding a dilute hydrochloric acid solution with the mass fraction of 10% while stirring at 500rpm/min, adjusting the pH of the reaction system to 4, raising the temperature to 45 ℃, and continuing stirring for 1h at the speed of 500 rpm/min. Standing for 6h, adding a proper amount of a pore-forming agent PEG400, wherein the molar ratio of PEG400 to TEOS is 1. And (3) introducing nitrogen into the hydrothermal reaction kettle, transferring the wet gel into the hydrothermal reaction kettle, sealing the hydrothermal reaction kettle, and drying the hydrothermal reaction kettle for 72 hours at the temperature of 100 ℃ in a blast oven. Soaking the silicon dioxide gel after thermal-oxidative aging in an ethanol solution for 8h, and repeatedly soaking for 3 times. Finally, supercritical extraction is carried out for 5 hours at 50 ℃ and 10Mpa to obtain the silicon dioxide aerogel.
2. Grinding and crushing the aerogel and sieving the crushed aerogel with a 500-mesh sieve to obtain aerogel particles with uniform particle size. LCP, silicon dioxide aerogel particles, short glass fibers, a silane coupling agent KH570 and an antioxidant 1010 are uniformly mixed by a high-speed mixer according to a certain proportion, and are mixed for 10min at 1000rpm/min, wherein the formula proportion is as follows: 70 parts of LCP, 25 parts of silicon dioxide aerogel, 4 parts of short glass fiber, 0.5 part of silane coupling agent KH570 and 0.5 part of antioxidant. Then the mixture is extruded, melted, modified and granulated, and the extrusion process parameters are as follows: a charging section, a 290 ℃ compression section, a 300 ℃ homogenization section and a 310 ℃ screw rotating speed: 250rpm/min.
Example 5
A method for preparing a low dielectric constant LCP composite, the method comprising:
1. adding Tetraethoxysilane (TEOS) into a proper amount of deionized water, wherein the molar ratio of TEOS to deionized water is 1,
and dripping 10 mass percent of dilute hydrochloric acid solution while stirring at 500rpm/min, adjusting the pH of the reaction system to 4, raising the temperature to 45 ℃, and continuing stirring for 1 hour at the speed of 500 rpm/min. After standing for 6 hours, adding a proper amount of pore-foaming agent PEG600, wherein the molar ratio of PEG600 to TEOS is 1. And introducing nitrogen into the hydrothermal reaction kettle for treatment, transferring the wet gel into the hydrothermal reaction kettle, sealing, and drying in a forced air oven at 100 ℃ for 72 hours. Soaking the silicon dioxide gel after thermal oxidation aging in ethanol solution for 8h, and repeatedly soaking for 3 times. And finally, performing supercritical extraction for 5 hours at 50 ℃ and 10Mpa to obtain the silicon dioxide aerogel.
2. Grinding and crushing the aerogel and sieving the crushed aerogel with a 500-mesh sieve to obtain aerogel particles with uniform particle size. LCP, silicon dioxide aerogel particles, short glass fibers, a silane coupling agent KH570 and an antioxidant 1010 are uniformly mixed by a high-speed mixer according to a certain proportion, and are mixed for 10min at 1000rpm/min, wherein the formula proportion is as follows: 63 parts of LCP, 30 parts of silica aerogel, 5 parts of short glass fiber, 1 part of silane coupling agent KH570 and 1 part of antioxidant. Then the mixture is extruded, melted, modified and granulated, and the extrusion process parameters are as follows: a charging section, a 290 ℃ compression section, a 300 ℃ homogenization section and a 310 ℃ screw rotating speed: 200rpm/min.
Comparative example 1
A method of preparing an LCP composite, the method comprising:
LCP, short glass fiber, silane coupling agent KH570 and antioxidant 1010 are mixed uniformly by a high-speed mixer according to a certain proportion, and are mixed for 10min at 1000rpm/min, wherein the formula proportion is as follows: 94 parts of LCP, 5 parts of short glass fiber, 0.5 part of silane coupling agent KH570 and 0.5 part of antioxidant. Then the mixture is extruded, melted, modified and granulated, and the extrusion process parameters are as follows: a charging section, a 290 ℃ compression section, a 300 ℃ homogenization section and a 310 ℃ screw rotating speed: 200rpm/min.
Comparative example 2
A method of preparing an LCP composite, the method comprising:
LCP, short glass fiber, silane coupling agent KH570 and antioxidant 1010 are mixed uniformly by a high-speed mixer according to a certain proportion, and are mixed for 10min at 1000rpm/min, wherein the formula proportion is as follows: 93 parts of LCP, 5 parts of short glass fiber, 1 part of silane coupling agent KH570 and 1 part of antioxidant. Then carrying out extrusion, melting, modification and granulation on the mixture, wherein the extrusion process parameters are as follows: a charging section, a 290 ℃ compression section, a 300 ℃ homogenization section and a 310 ℃ screw rotating speed: 250rpm/min.
Examples of the experiments
The silica aerogels of examples 1-5 were tested for porosity and the LCP material extrudates provided in examples 1-5 and comparative examples 1-2 were tested for dielectric constant and dielectric loss, the results of which are shown in the following table.
From the above table, when the LCP composite material is prepared by the method provided in the embodiments of the present application, the dielectric constant of the LCP composite material is reduced from 3.3 to 2.1 by compounding the silica aerogel, and the improvement rate reaches 36%. The dielectric loss is reduced from 0.0028 to 0.0018.
One or more technical solutions in the embodiments of the present invention at least have the following technical effects or advantages:
(1) According to the method provided by the embodiment of the invention, the low-dielectric LCP composite material is prepared by introducing silica aerogel with different apertures into LCP and controlling the content of the introduced aerogel in the LCP through extrusion granulation, wherein the larger the aperture of the silica aerogel is, the lower the dielectric constant is;
(2) According to the method provided by the embodiment of the invention, the porous structure of the aerogel is utilized and compounded into the LCP material, and air with a lower dielectric constant is introduced, so that the dielectric constant of the LCP material is reduced. Meanwhile, LCP composite materials with different dielectric constants can be prepared conveniently by adjusting the pore size of the aerogel.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A low dielectric constant LCP composite, the composition of which comprises: LCP and functional materials, wherein the functional materials are in a porous structure.
2. The low dielectric constant LCP composite of claim 1, wherein the functional material comprises an aerogel.
3. The low dielectric constant LCP composite of claim 1, wherein the functional material comprises a silica aerogel.
4. The low dielectric constant LCP composite of claim 1, wherein the composition of the composite comprises: LCP, functional materials, glass fibers, coupling agents and antioxidants.
5. The low dielectric constant LCP composite of claim 4, wherein the composition of the composite comprises, in parts by mass: 60-80 parts of LCP, 20-35 parts of functional materials, 5 parts of glass fibers, 0.5-2 parts of coupling agents and 0.5-1 part of antioxidants.
6. A method of preparing the low dielectric constant LCP composite of any one of claims 1 to 5, comprising:
obtaining a functional material;
and mixing, melting and granulating the LCP, the functional material, the glass fiber, the coupling agent and the antioxidant to obtain the LCP composite material.
7. The method for preparing the low dielectric constant LCP composite material as claimed in claim 6, wherein the functional material comprises silica aerogel, and the obtaining the functional material specifically comprises:
dissolving ethyl orthosilicate in a solvent, and mixing with absolute ethyl alcohol to obtain a mixed solution;
adjusting the mixed solution to set conditions, stirring, and then standing;
adding a pore-foaming agent into the mixed solution after standing to obtain silicon dioxide wet gel;
carrying out thermal oxidation aging on the silicon dioxide wet gel to obtain a functional material;
wherein the setting conditions include: the pH value is 3-5, and the temperature is 40-60 ℃.
8. The method for preparing the low dielectric constant LCP composite of claim 7, wherein the molar ratio of the tetraethoxysilane to the solvent is 1:3-1:5; and/or
The molar ratio of the ethyl orthosilicate to the absolute ethyl alcohol is 1:4-1:6; and/or
The pH control under the set condition adopts a dilute hydrochloric acid solution, and the mass fraction of the dilute hydrochloric acid solution is 5-10%; and/or
The pore-foaming agent comprises polyethylene glycol, and the molar ratio of the pore-foaming agent to tetraethoxysilane is 1:3-1:6.
9. the method for preparing the low dielectric constant LCP composite material of claim 7, wherein the adding pore-forming agent into the mixed solution after standing to obtain the silica wet gel comprises:
adding a pore-foaming agent into the mixed solution after standing, and then adjusting the mixed solution to a set pH value by adopting ammonia water to obtain silicon dioxide wet gel;
wherein the set pH value is 7-9.
10. The method for preparing the low dielectric constant LCP composite material of claim 7, wherein the silica wet gel is subjected to thermo-oxidative aging to obtain a functional material, specifically comprising:
subjecting the silica wet gel to thermo-oxidative aging,
soaking the silica wet gel subjected to thermal oxidative aging in an ethanol solution;
performing supercritical extraction on the silica wet gel soaked in the ethanol solution to obtain a functional material;
wherein the temperature of the supercritical extraction is 35-50 ℃, the pressure of the supercritical extraction is 8-12MPa, and the time of the supercritical extraction is 4-6h.
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| CN115948029A (en) * | 2022-12-29 | 2023-04-11 | 宁夏清研高分子新材料有限公司 | Low-dielectric high-hydrophobicity LCP-based LDS composite material and preparation method thereof |
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| CN115948029A (en) * | 2022-12-29 | 2023-04-11 | 宁夏清研高分子新材料有限公司 | Low-dielectric high-hydrophobicity LCP-based LDS composite material and preparation method thereof |
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