CN108239327A - The preparation method of low-dielectric loss composite elastic dielectric material - Google Patents
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- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
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- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
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Abstract
The invention discloses the preparation method of low-dielectric loss composite elastic dielectric material, which is prepared low-dielectric loss composite elastic dielectric material by ultrasonic disperse, centrifuge washing, drying, the reaction of substep vacuum high-temperature, ice bath cooling, pressurization mixing, extruding pelletization, plastotype, packaging and other steps respectively by raw materials such as magnesium titanate, arsenic potassium, sorbierite, Sensiva SC50, dimethyl silicone polymer, polytetrafluoroethylene (PTFE), polyethylene, styrene, butadiene, titanium dioxide, natural rubber, phenolic resin.The low-dielectric loss composite elastic dielectric material being prepared, dielectric properties are good, loss is low while elastic properties of materials is big, can meet the specific demand of a variety of users.
Description
Technical field
The present invention relates to this technical fields of electronic material, are related specifically to low-dielectric loss composite elastic dielectric material
Preparation method.
Background technology
Energy can be transformed into mechanical energy by electroactive polymer in the form of charge and voltage, and and vice versa.
In recent years, some can cause very big interest by the electroactive brake material of external electrical field control response.But this
The shortcomings that a little electroactive polymers be they need very high operation electric field (>100V/ μm) generate Large strain and required bullet
Performance metric density, which is far above, is currently available that piezoelectric material (elastic energy density>0.1J/cm3).Just as getting up early publication is carried
As arriving, the reason of needing such high electric field is the low-k of these electroactive polymers.From the aspects of energy saving, electricity
The elastic energy density that living polymer generates can not be more than the electric energy density of input, i.e., K ∈ in linear dielectric0E2/2,
Middle K is dielectric constant, ∈0=8.85 × 10-12F/m, E are extra electric field.The fact that this is simple points out to improve electroactive polymerization
The dielectric constant of object obtains the principal characteristic of the high electomechanical response under low application electric field with this.
Invention content
In order to solve the above technical problems, the invention discloses the preparation method of low-dielectric loss composite elastic dielectric material,
The technique is by magnesium titanate, arsenic potassium, sorbierite, Sensiva SC50, dimethyl silicone polymer, polytetrafluoroethylene (PTFE), polyethylene, benzene
The raw materials such as ethylene, butadiene, titanium dioxide, natural rubber, phenolic resin pass through ultrasonic disperse, centrifuge washing, drying, divide respectively
The reaction of step vacuum high-temperature, ice bath cooling, pressurization mixing, extruding pelletization, plastotype, packaging and other steps are prepared low-dielectric loss and answer
Close elastomeric dielectric material.The low-dielectric loss composite elastic dielectric material being prepared, dielectric properties are good, loss is low, simultaneously
Elastic properties of materials is big, can meet the specific demand of a variety of users.
The purpose of the present invention can be achieved through the following technical solutions：
The preparation method of low-dielectric loss composite elastic dielectric material, includes the following steps：
(1) by 2-3 parts of magnesium titanate, 1-3 parts of arsenic potassium, the mixing of 2-5 parts of sorbierite, be added to 2-6 parts of Sensiva SC50,
In 3-6 parts of dimethyl silicone polymer, ultrasonic disperse is carried out after stirring evenly, then mixture is centrifuged, and collects solid precipitation,
It is washed with distilled water 3 times, 65 DEG C are dried for standby；
(2) by 4-13 parts of polytetrafluoroethylene (PTFE), 5-10 parts of polyethylene, 1-5 parts of styrene, 2-6 parts of butadiene, titanium dioxide 1-
2 parts, 2-5 parts of natural rubber, 1-5 parts of phenolic resin, 1-4 parts of coupling agent and step (1) solid mixture sequentially add vacuum
Vacuum high-temperature step sintering is carried out in reacting furnace, the first step, which vacuumizes, is heated to 100-215 DEG C of insulation reaction 30min, second step
It is rapidly heated with the rate of 10 DEG C/min to 200-210 DEG C, and boosts to normal pressure naturally, insulation reaction 1h, third is walked with 2
DEG C/rate of min is warming up to 300-305 DEG C, insulation reaction 10-15h；
(3) the pyroreaction object of step (2) is placed in ice bath container and carries out fast cooling；
(4) the cooling product in step (3) was subjected to screening and choosing；
(5) product of step (4) is injected into mixer, then adds in 1-4 parts of antifoaming agent, 1-4 parts of stabilizer, pressurize
Mixing, pressure 10-15MPa；
(6) reactant of step (5) injection double screw extruder extrusion, granulation, plastotype, packaging are got product.
Preferably, the ultrasonic power in the step (1) is 250W, ultrasonic 30-60min.
Preferably, the centrifugal rotational speed in the step (1) is 3000-5000rpm/min, centrifugation time 10-15min.
Preferably, the coupling agent in the step (2) be selected from vinyltrimethoxysilane, vinyl trichlorosilane, γ-
Any one or a few in glycidoxypropyltrimethoxysilane alkane, double-(tri- ethoxy silicon propyl of 3-) tetrasulfide.
Preferably, the vacuum pressure in the step (2) is 5*10-7Pa。
Preferably, the mesh size of crossing in the step (4) is 2000 mesh.
Preferably, the antifoaming agent in the step (5) is in hydrophobic silica, fatty amine, paraffin, polyethylene glycol
Any one or a few.
Preferably, the stabilizer in the step (5) is in lead salicylate, barium stearate, orange osmanthus acid barium, calcium stearate
Any one or a few.
Preferably, the extruder temperature in the step (6) is 220-230 DEG C, and screw speed is 1000-1100 revs/min
Compared with prior art, the present invention advantage is：
(1) preparation method of low-dielectric loss composite elastic dielectric material of the invention is by magnesium titanate, arsenic potassium, sorb
It is alcohol, Sensiva SC50, dimethyl silicone polymer, polytetrafluoroethylene (PTFE), polyethylene, styrene, butadiene, titanium dioxide, natural
The raw materials such as rubber, phenolic resin respectively by ultrasonic disperse, centrifuge washing, drying, substep vacuum high-temperature reaction, ice bath cooling,
Low-dielectric loss composite elastic dielectric material is prepared in pressurization mixing, extruding pelletization, plastotype, packaging and other steps.It is prepared
Low-dielectric loss composite elastic dielectric material, dielectric properties are good, loss is low while elastic properties of materials is big, can meet a variety of
The specific demand of user.
(2) low-dielectric loss composite elastic raw dielectric material of the invention is easy to get, is simple for process, suitable for large-scale industry
Change and use, it is highly practical.
Specific embodiment
The technical solution of invention is described in detail with reference to specific embodiment.
Embodiment 1
(1) by 2 parts of 2 parts of magnesium titanate, 1 part of arsenic potassium, sorbierite mixing, 2 parts of Sensiva SC50, poly dimethyl are added to
In 3 parts of siloxanes, carry out ultrasonic disperse after stirring evenly, ultrasonic power 250W, ultrasonic 30min, then mixture carry out from
The heart, centrifugal rotational speed 3000rpm/min, centrifugation time 10min collect solid precipitation, are washed with distilled water 3 times, 65 DEG C of drying
It is spare；
(2) by 4 parts of polytetrafluoroethylene (PTFE), 5 parts of polyethylene, 1 part of styrene, 2 parts of butadiene, 1 part of titanium dioxide, natural rubber
2 parts, 1 part of phenolic resin, 1 part of vinyltrimethoxysilane and step (1) solid mixture sequentially add vacuum reaction stove
It is interior progress vacuum high-temperature step sintering, the first step, which vacuumizes, is heated to 100-215 DEG C of insulation reaction 30min, second step with 10 DEG C/
The rate of min is rapidly heated to 200-210 DEG C, and boosts to normal pressure naturally, insulation reaction 1h, and third is walked with 2 DEG C/min's
Rate is warming up to 300-305 DEG C, and insulation reaction 10h, wherein vacuum pressure are 5*10-7Pa；
(3) the pyroreaction object of step (2) is placed in ice bath container and carries out fast cooling；
(4) the cooling product in step (3) was subjected to screening and choosing, it is 2000 mesh to cross mesh size；
(5) product of step (4) is injected into mixer, then adds in 1 part of hydrophobic silica, 1 part of lead salicylate, carried out
Pressurization mixing, pressure 10MPa；
(6) reactant of step (5) injection double screw extruder extrusion, granulation, plastotype, packaging are got product, wherein
Extruder temperature is 220-230 DEG C, and screw speed is 1000-1100 revs/min.
The performance test results of low-dielectric loss composite elastic dielectric material obtained are as shown in table 1.
Embodiment 2
(1) by 3 parts of magnesium titanate 2,1 part of arsenic potassium, sorbierite mixing, 3 parts of Sensiva SC50, poly dimethyl silicon are added to
In 4 parts of oxygen alkane, carry out ultrasonic disperse after stirring evenly, ultrasonic power 250W, ultrasonic 40min, then mixture centrifuged,
Centrifugal rotational speed is 4000rpm/min, centrifugation time 12min, collects solid precipitation, is washed with distilled water 3 times, 65 DEG C of drying are standby
With；
(2) by 7 parts of polytetrafluoroethylene (PTFE), 6 parts of polyethylene, 3 parts of styrene, 3 parts of butadiene, 1 part of titanium dioxide, natural rubber
3 parts, 2 parts of phenolic resin, 2 parts of vinyl trichlorosilane and step (1) solid mixture sequentially add in vacuum reaction stove into
Row vacuum high-temperature step sintering, the first step, which vacuumizes, is heated to 100-215 DEG C of insulation reaction 30min, and second step is with 10 DEG C/min
Rate be rapidly heated to 200-210 DEG C, and boost to normal pressure naturally, insulation reaction 1h, third walk with the rate of 2 DEG C/min
300-305 DEG C is warming up to, insulation reaction 12h, wherein vacuum pressure are 5*10-7Pa；
(3) the pyroreaction object of step (2) is placed in ice bath container and carries out fast cooling；
(4) the cooling product in step (3) was subjected to screening and choosing, it is 2000 mesh to cross mesh size；
(5) product of step (4) is injected into mixer, then adds in 2 parts of fatty amine, 2 parts of barium stearate, it is mixed to carry out pressurization
It closes, pressure 12MPa；
(6) reactant of step (5) injection double screw extruder extrusion, granulation, plastotype, packaging are got product, wherein
Extruder temperature is 220-230 DEG C, and screw speed is 1000-1100 revs/min.
The performance test results of low-dielectric loss composite elastic dielectric material obtained are as shown in table 1.
Embodiment 3
(1) by 4 parts of 3 parts of magnesium titanate, 2 parts of arsenic potassium, sorbierite mixing, 5 parts of Sensiva SC50, poly dimethyl are added to
In 5 parts of siloxanes, carry out ultrasonic disperse after stirring evenly, ultrasonic power 250W, ultrasonic 50min, then mixture carry out from
The heart, centrifugal rotational speed 4500rpm/min, centrifugation time 14min collect solid precipitation, are washed with distilled water 3 times, 65 DEG C of drying
It is spare；
(2) by 11 parts of polytetrafluoroethylene (PTFE), 9 parts of polyethylene, 4 parts of styrene, 5 parts of butadiene, 2 parts of titanium dioxide, natural rubber
4 parts of glue, 4 parts of phenolic resin, γ -3 parts of glycidoxypropyltrimethoxysilane alkane and the solid mixture of step (1) are successively
It adds in and vacuum high-temperature step sintering is carried out in vacuum reaction stove, the first step, which vacuumizes, is heated to 100-215 DEG C of insulation reaction
30min, second step is rapidly heated with the rate of 10 DEG C/min to 200-210 DEG C, and boosts to normal pressure naturally, insulation reaction
1h, third step are warming up to 300-305 DEG C with the rate of 2 DEG C/min, and insulation reaction 14h, wherein vacuum pressure are 5*10-7Pa；
(3) the pyroreaction object of step (2) is placed in ice bath container and carries out fast cooling；
(4) the cooling product in step (3) was subjected to screening and choosing, it is 2000 mesh to cross mesh size；
(5) product of step (4) is injected into mixer, then adds in 3 parts of paraffin, 3 parts of orange osmanthus acid barium, it is mixed to carry out pressurization
It closes, pressure 14MPa；
(6) reactant of step (5) injection double screw extruder extrusion, granulation, plastotype, packaging are got product, wherein
Extruder temperature is 220-230 DEG C, and screw speed is 1000-1100 revs/min.
The performance test results of low-dielectric loss composite elastic dielectric material obtained are as shown in table 1.
Embodiment 4
(1) by 5 parts of 3 parts of magnesium titanate, 3 parts of arsenic potassium, sorbierite mixing, 6 parts of Sensiva SC50, poly dimethyl are added to
In 6 parts of siloxanes, carry out ultrasonic disperse after stirring evenly, ultrasonic power 250W, ultrasonic 60min, then mixture carry out from
The heart, centrifugal rotational speed 5000rpm/min, centrifugation time 15min collect solid precipitation, are washed with distilled water 3 times, 65 DEG C of drying
It is spare；
(2) by 13 parts of polytetrafluoroethylene (PTFE), 10 parts of polyethylene, 5 parts of styrene, 6 parts of butadiene, 2 parts of titanium dioxide, natural rubber
5 parts of glue, 5 parts of phenolic resin, double -4 parts of (tri- ethoxy silicon propyl of 3-) tetrasulfide and the solid mixture of step (1) sequentially add
Vacuum high-temperature step sintering is carried out in vacuum reaction stove, the first step, which vacuumizes, is heated to 100-215 DEG C of insulation reaction 30min, the
Two steps are rapidly heated with the rate of 10 DEG C/min to 200-210 DEG C, and boost to normal pressure naturally, insulation reaction 1h, third step
300-305 DEG C is warming up to the rate of 2 DEG C/min, insulation reaction 15h, wherein vacuum pressure are 5*10-7Pa；
(3) the pyroreaction object of step (2) is placed in ice bath container and carries out fast cooling；
(4) the cooling product in step (3) was subjected to screening and choosing, it is 2000 mesh to cross mesh size；
(5) product of step (4) is injected into mixer, then adds in 4 parts of polyethylene glycol, 4 parts of calcium stearate, pressurize
Mixing, pressure 15MPa；
(6) reactant of step (5) injection double screw extruder extrusion, granulation, plastotype, packaging are got product, wherein
Extruder temperature is 220-230 DEG C, and screw speed is 1000-1100 revs/min.
The performance test results of low-dielectric loss composite elastic dielectric material obtained are as shown in table 1.
Comparative example 1
(1) by 2 parts of 2 parts of magnesium titanate, 1 part of arsenic potassium, sorbierite mixing, 2 parts of Sensiva SC50, poly dimethyl are added to
In 3 parts of siloxanes, carry out ultrasonic disperse after stirring evenly, ultrasonic power 250W, ultrasonic 30min, then mixture carry out from
The heart, centrifugal rotational speed 3000rpm/min, centrifugation time 10min collect solid precipitation, are washed with distilled water 3 times, 65 DEG C of drying
It is spare；
(2) by 4 parts of polytetrafluoroethylene (PTFE), 5 parts of polyethylene, 1 part of titanium dioxide, 2 parts of natural rubber, 1 part of phenolic resin, ethylene
1 part of base trimethoxy silane and the solid mixture of step (1), which sequentially add, carries out vacuum high-temperature substep burning in vacuum reaction stove
Knot, the first step, which vacuumizes, is heated to 100-215 DEG C of insulation reaction 30min, second step with the rate of 10 DEG C/min be rapidly heated to
200-210 DEG C, and normal pressure is boosted to naturally, insulation reaction 1h, third step is warming up to 300-305 DEG C with the rate of 2 DEG C/min,
Insulation reaction 10h, wherein vacuum pressure are 5*10-7Pa；
(3) the pyroreaction object of step (2) is placed in ice bath container and carries out fast cooling；
(4) the cooling product in step (3) was subjected to screening and choosing, it is 2000 mesh to cross mesh size；
(5) product of step (4) is injected into mixer, then adds in 1 part of hydrophobic silica, 1 part of lead salicylate, carried out
Pressurization mixing, pressure 10MPa；
(6) reactant of step (5) injection double screw extruder extrusion, granulation, plastotype, packaging are got product, wherein
Extruder temperature is 220-230 DEG C, and screw speed is 1000-1100 revs/min.
The performance test results of low-dielectric loss composite elastic dielectric material obtained are as shown in table 1.
Comparative example 2
(1) by 3 parts of 3 parts of magnesium titanate, arsenic potassium mixing, 6 parts of Sensiva SC50,6 parts of dimethyl silicone polymer are added to
In, carry out ultrasonic disperse after stirring evenly, ultrasonic power 250W, ultrasonic 60min, then mixture centrifuged, centrifugation turns
Speed is 5000rpm/min, centrifugation time 15min, collects solid precipitation, is washed with distilled water 3 times, 65 DEG C are dried for standby；
(2) by 10 parts of polyethylene, 5 parts of styrene, 6 parts of butadiene, 2 parts of titanium dioxide, 5 parts of natural rubber, phenolic resin 5
Part, the solid mixture of double -4 parts of (tri- ethoxy silicon propyl of 3-) tetrasulfide and step (1) sequentially add in vacuum reaction stove into
Row vacuum high-temperature step sintering, the first step, which vacuumizes, is heated to 100-215 DEG C of insulation reaction 30min, and second step is with 10 DEG C/min
Rate be rapidly heated to 200-210 DEG C, and boost to normal pressure naturally, insulation reaction 1h, third walk with the rate of 2 DEG C/min
300-305 DEG C is warming up to, insulation reaction 15h, wherein vacuum pressure are 5*10-7Pa；
(3) the pyroreaction object of step (2) is placed in ice bath container and carries out fast cooling；
(4) the cooling product in step (3) was subjected to screening and choosing, it is 2000 mesh to cross mesh size；
(5) product of step (4) is injected into mixer, then adds in 4 parts of polyethylene glycol, 4 parts of calcium stearate, pressurize
Mixing, pressure 15MPa；
(6) reactant of step (5) injection double screw extruder extrusion, granulation, plastotype, packaging are got product, wherein
Extruder temperature is 220-230 DEG C, and screw speed is 1000-1100 revs/min.
The performance test results of low-dielectric loss composite elastic dielectric material obtained are as shown in table 1.
The low-dielectric loss composite elastic dielectric material obtained of embodiment 1-4 and comparative example 1-2 is carried out relatively respectively
This several dielectric constant, elastic energy density, impact strength performance tests.
Table 1
| Relative dielectric constant | Elastic energy density J/cm3 | Impact strength (non-notch) kJ/cm3 | |
| Embodiment 1 | 4 | 0.27 | 45 |
| Embodiment 2 | 3.8 | 0.23 | 49 |
| Embodiment 3 | 3.7 | 0.26 | 47 |
| Embodiment 4 | 3.9 | 0.24 | 42 |
| Comparative example 1 | 7.9 | 0.08 | 19 |
| Comparative example 2 | 9 | 0.11 | 24 |
The number of component involved in claims of the present invention and specification is parts by weight.
The preparation method of the low-dielectric loss composite elastic dielectric material of the present invention is by magnesium titanate, arsenic potassium, sorbierite, second
Base hexyl glycerine, dimethyl silicone polymer, polytetrafluoroethylene (PTFE), polyethylene, styrene, butadiene, titanium dioxide, natural rubber,
The raw materials such as phenolic resin respectively by ultrasonic disperse, centrifuge washing, drying, substep vacuum high-temperature reaction, ice bath cooling, pressurize it is close
Low-dielectric loss composite elastic dielectric material is prepared in refining, extruding pelletization, plastotype, packaging and other steps.Low Jie being prepared
Electrical loss composite elastic dielectric material, dielectric properties are good, loss is low while elastic properties of materials is big, can meet a variety of users'
Specific demand.The low-dielectric loss composite elastic raw dielectric material of the present invention is easy to get, is simple for process, suitable for heavy industrialization
With highly practical.
The foregoing is merely the embodiment of the present invention, are not intended to limit the scope of the invention, every to utilize this hair
The equivalent structure or equivalent flow shift that bright description is made directly or indirectly is used in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (9)
1. the preparation method of low-dielectric loss composite elastic dielectric material, which is characterized in that include the following steps：
(1) by 2-5 parts of 2-3 parts of magnesium titanate, 1-3 parts of arsenic potassium, sorbierite mixing, 2-6 parts of Sensiva SC50, poly- two are added to
In 3-6 parts of methylsiloxane, ultrasonic disperse is carried out after stirring evenly, then mixture is centrifuged, and solid precipitation is collected, with steaming
Distilled water is washed 3 times, and 65 DEG C are dried for standby；
(2) by 4-13 parts of polytetrafluoroethylene (PTFE), 5-10 parts of polyethylene, 1-5 parts of styrene, 2-6 parts of butadiene, 1-2 parts of titanium dioxide,
2-5 parts of natural rubber, 1-5 parts of phenolic resin, 1-4 parts of coupling agent and step (1) solid mixture sequentially add vacuum reaction
Vacuum high-temperature step sintering is carried out in stove, the first step, which vacuumizes, is heated to 100-215 DEG C of insulation reaction 30min, and second step is with 10
DEG C/rate of min is rapidly heated to 200-210 DEG C, and boost to normal pressure naturally, insulation reaction 1h, third is walked with 2 DEG C/min
Rate be warming up to 300-305 DEG C, insulation reaction 10-15h；
(3) the pyroreaction object of step (2) is placed in ice bath container and carries out fast cooling；
(4) the cooling product in step (3) was subjected to screening and choosing；
(5) product of step (4) is injected into mixer, then adds in 1-4 parts of antifoaming agent, 1-4 parts of stabilizer, it is mixed to carry out pressurization
It closes, pressure 10-15MPa；
(6) reactant of step (5) injection double screw extruder extrusion, granulation, plastotype, packaging are got product.
2. the preparation method of low-dielectric loss composite elastic dielectric material according to claim 1, which is characterized in that described
Ultrasonic power in step (1) is 250W, ultrasonic 30-60min.
3. the preparation method of low-dielectric loss composite elastic dielectric material according to claim 1, which is characterized in that described
Centrifugal rotational speed in step (1) is 3000-5000rpm/min, centrifugation time 10-15min.
4. the preparation method of low-dielectric loss composite elastic dielectric material according to claim 1, which is characterized in that described
Coupling agent in step (2) is selected from vinyltrimethoxysilane, vinyl trichlorosilane, γ-glycidyl ether propyl three
Any one or a few in methoxy silane, double-(tri- ethoxy silicon propyl of 3-) tetrasulfide.
5. the preparation method of low-dielectric loss composite elastic dielectric material according to claim 1, which is characterized in that described
Vacuum pressure in step (2) is 5*10-7Pa。
6. the preparation method of low-dielectric loss composite elastic dielectric material according to claim 1, which is characterized in that described
Mesh size of crossing in step (4) is 2000 mesh.
7. the preparation method of low-dielectric loss composite elastic dielectric material according to claim 1, which is characterized in that described
Any one or a few in hydrophobic silica, fatty amine, paraffin, polyethylene glycol of antifoaming agent in step (5).
8. the preparation method of low-dielectric loss composite elastic dielectric material according to claim 1, which is characterized in that described
Any one or a few in lead salicylate, barium stearate, orange osmanthus acid barium, calcium stearate of stabilizer in step (5).
9. the preparation method of low-dielectric loss composite elastic dielectric material according to claim 1, which is characterized in that described
Extruder temperature in step (6) is 220-230 DEG C, and screw speed is 1000-1100 revs/min.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103289158A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Substrate and preparation method thereof |
| CN103435946A (en) * | 2013-08-27 | 2013-12-11 | 电子科技大学 | Method for preparing polytetrafluoroethylene (PTFE) compounded microwave ceramic substrate |
| CN106633180A (en) * | 2016-10-24 | 2017-05-10 | 西南科技大学 | Preparation method of ultra-low dielectric nano-composite polymer material |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103289158A (en) * | 2012-02-29 | 2013-09-11 | 深圳光启创新技术有限公司 | Substrate and preparation method thereof |
| CN103435946A (en) * | 2013-08-27 | 2013-12-11 | 电子科技大学 | Method for preparing polytetrafluoroethylene (PTFE) compounded microwave ceramic substrate |
| CN106633180A (en) * | 2016-10-24 | 2017-05-10 | 西南科技大学 | Preparation method of ultra-low dielectric nano-composite polymer material |
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Application publication date: 20180703 |