CN113183380A - Processing method of ceramic modified PTFE film for 5G high-frequency copper-clad plate - Google Patents
Processing method of ceramic modified PTFE film for 5G high-frequency copper-clad plate Download PDFInfo
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- 239000000919 ceramic Substances 0.000 title claims abstract description 179
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 57
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 57
- 238000003672 processing method Methods 0.000 title claims abstract description 17
- 239000012528 membrane Substances 0.000 claims abstract description 106
- 239000000843 powder Substances 0.000 claims abstract description 52
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- 238000005245 sintering Methods 0.000 claims abstract description 30
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- 239000011347 resin Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
- -1 polytetrafluoroethylene Polymers 0.000 claims abstract description 16
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- 238000003825 pressing Methods 0.000 claims abstract description 13
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- 239000011812 mixed powder Substances 0.000 claims description 2
- 239000006185 dispersion Substances 0.000 abstract description 6
- 238000012545 processing Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 6
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- 238000004519 manufacturing process Methods 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/006—Pressing and sintering powders, granules or fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
- B29B13/021—Heat treatment of powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
- B29B13/10—Conditioning or physical treatment of the material to be shaped by grinding, e.g. by triturating; by sieving; by filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/02—Mixing; Kneading non-continuous, with mechanical mixing or kneading devices, i.e. batch type
- B29B7/22—Component parts, details or accessories; Auxiliary operations
- B29B7/28—Component parts, details or accessories; Auxiliary operations for measuring, controlling or regulating, e.g. viscosity control
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/58—Measuring, controlling or regulating
- B29C2043/5808—Measuring, controlling or regulating pressure or compressing force
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use 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; Derivatives of such polymers
- C08J2327/02—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/12—Characterised by the use 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; Derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C08J2327/18—Homopolymers or copolymers of tetrafluoroethylene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The invention discloses a processing method of a ceramic modified PTFE film for a 5G high-frequency copper-clad plate, which comprises the following steps: carrying out high-temperature heat treatment on the ceramic powder; sieving the treated ceramic powder by using a screen, and mixing the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent; pouring the mixed mixture into a mold, pressing into a hollow cylindrical blank, and demolding the cylindrical blank to obtain a ceramic membrane blank; placing the ceramic membrane blank into a blast sintering furnace for sintering; and placing the sintered ceramic membrane blank in a heat preservation furnace for heat preservation, taking the ceramic membrane blank out of the heat preservation furnace after the temperature of the ceramic membrane blank is uniform, jacking a core shaft into a central hole of the ceramic membrane blank, and then carrying out rotary cutting on the ceramic membrane blank according to the set membrane thickness to obtain the ceramic modified PTFE membrane. The invention can improve the uniformity of ceramic powder dispersion, and the formed film has good thickness uniformity and film layer uniformity, can be produced in batches, and has small processing difficulty and high practicability.
Description
Technical Field
The invention belongs to the technical field of high-frequency and ultrahigh-frequency wireless communication, and particularly relates to a processing method of a ceramic modified PTFE film for a 5G high-frequency copper-clad plate.
Background
At present, the PTFE emulsion is mostly used for ceramic filled PTFE films, or ceramic powder is added to dispersed PTFE resin, the ceramic filled PTFE films are prepared by adopting a basic calendering method, because the processing difficulty is high, the inorganic ceramic is subjected to surface modification, a grafting coupling agent is added, other auxiliary agents are added in the production process, and because the precision of a compression roller, the size and the dispersion uniformity of the emulsion are limited, the basic PTFE emulsion and the dispersed PTFE resin can only be generally used as a laboratory for research, the film thickness uniformity and the film layer uniformity of a formed film hardly meet the use of a substrate film for high-frequency and ultrahigh-frequency copper-clad plates with the width of actually exceeding 500mm, the requirement of mass production cannot be met, and therefore, the practicability is very low.
When the ceramic membrane is prepared by using the suspended polytetrafluoroethylene, a vertical sintering mode is usually adopted during sintering, and because the blank has a great weight, the size difference of the upper end and the lower end of the sintered blank is overlarge (namely, the phenomenon of big and small ends occurs), the blank deforms, so that the material waste is large when the membrane is turned, and the cost is increased.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a processing method of the ceramic modified PTFE film for the 5G high-frequency copper-clad plate aiming at the defects of the prior art, the processing method of the ceramic modified PTFE film for the 5G high-frequency copper-clad plate can improve the dispersion uniformity of ceramic powder, and the formed film has good film thickness uniformity and film layer uniformity, small processing difficulty, can meet the requirement of mass production and has high practicability.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a processing method of a ceramic modified PTFE film for a 5G high-frequency copper-clad plate comprises the following steps:
(1) carrying out high-temperature heat treatment on the ceramic powder;
(2) sieving the treated ceramic powder by using a screen, and mixing the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent;
(3) pouring the mixed mixture into a mold, pressing into a hollow cylindrical blank, and demolding the cylindrical blank to obtain a ceramic membrane blank;
(4) placing the ceramic membrane blank into a blast sintering furnace for sintering;
(5) and placing the sintered ceramic membrane blank in a heat preservation furnace for heat preservation, taking the ceramic membrane blank out of the heat preservation furnace after the temperature of the ceramic membrane blank is uniform, jacking a core shaft into a central hole of the ceramic membrane blank, and then carrying out rotary cutting on the ceramic membrane blank according to the set membrane thickness to obtain the ceramic modified PTFE membrane.
As a further improved technical scheme of the invention, the step (1) is specifically as follows:
carrying out high-temperature heat treatment on ceramic powder, wherein the particle size of the ceramic powder is 1-6 um, the heat treatment temperature is 400-600 ℃, and the heat treatment time is 24-72 h.
As a further improved technical scheme of the invention, the step (2) is specifically as follows:
sieving the treated ceramic powder by using a 200-mesh screen, then roughly mixing the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent, and finely mixing the coarsely mixed powder by using a vertical hammer mill mixer, wherein the aperture of the screen of the vertical hammer mill mixer is 0.5-1.0 mm, the rotating speed of the vertical hammer mill mixer is 1500-3600 r/min, and the mixing times are 5-15 times.
As a further improved technical scheme of the invention, in the step (2), the mass percent of the polytetrafluoroethylene suspension resin is 65-95%, the mass percent of the ceramic powder is 4.5-30%, and the mass percent of the high-temperature dispersing agent is 0.5-5%.
As a further improved technical scheme of the invention, the step (3) is specifically as follows:
pouring the mixture after the fine mixing into a mould, pressing into a hollow cylindrical blank, wherein the pressing pressure is 20 MPa-30 MPa, the pressure maintaining time is 1h-3h, the pressure is removed after 30min, and demoulding is carried out to obtain a ceramic membrane blank, wherein the outer diameter of the ceramic membrane blank is 560 mm-580 mm, and the height of the ceramic membrane blank is more than or equal to 500 mm.
As a further improved technical scheme of the invention, the step (4) is specifically as follows:
the ceramic membrane blank is horizontally and rotatably sintered in a blast sintering furnace, the ceramic membrane blank does not rotate at the temperature of below 40 ℃, the rotating speed of the ceramic membrane blank is 1 r/h-3 r/h at the temperature of 40-360 ℃, and the rotating speed of the ceramic membrane blank is 2 r/h-4 r/h in the cooling process.
As a further improved technical scheme of the invention, the step (5) is specifically as follows:
and (2) placing the sintered ceramic membrane blank in a heat preservation furnace at 90-100 ℃ for heat preservation, taking out the ceramic membrane blank from the heat preservation furnace after the temperature of the ceramic membrane blank is uniform, jacking a special core shaft into a central hole of the ceramic membrane blank, installing the ceramic membrane blank on a rotary cutter, and carrying out rotary cutting on the ceramic membrane blank according to the set membrane thickness to obtain the ceramic modified PTFE membrane, wherein the thickness of the ceramic modified PTFE membrane is 0.1 mm.
The invention has the beneficial effects that:
1. according to the invention, substances such as a surface coupling agent and the like are selectively removed by adopting a high-heat treatment method of ceramic powder, part of active groups are reserved, and poor dispersion in the process of agglomerating and mixing the ceramic powder is avoided; reducing the proportion of surface hydroxyl groups; the CAF (conductive anode wire) resistance of the high-frequency copper-clad plate is improved; the PCB prepared by using the ceramic modified PTFE film meets the requirement that the tracking resistance CTI is more than 600V.
2. According to the invention, the high-temperature dispersing agent is added in the preparation process, the uniformity of ceramic powder dispersion is improved, the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent are blended by using a vertical hammer mill mixer, the mixing mode has good uniformity, batch production can be realized, and the processing difficulty is small; the invention adopts the rotary cutting film forming technology, can realize uniform film thickness and wide film, and has high practicability; can meet the use of the actual substrate film for the high-frequency and ultrahigh-frequency copper-clad plate with the width of more than 500 mm.
3. The ceramic membrane blank adopts a horizontal rotary sintering technology, namely the ceramic membrane blank is horizontally arranged in a sintering furnace for rotary sintering, so that the defect that the size is large and small easily caused by standing sintering is overcome, the difference between the upper and lower outer diameters of the sintered blank is within 5mm approximately, and the material loss caused by turning the membrane belongs to normal loss.
Detailed Description
The following further illustrates embodiments of the invention:
example 1:
a processing method of a ceramic modified PTFE film for a 5G high-frequency copper-clad plate comprises the following steps:
(1) carrying out high-temperature heat treatment on ceramic powder, wherein the particle size of the ceramic powder is D501 um, the heat treatment temperature is 400 ℃, and the heat treatment time is 72 h;
(2) sieving the treated ceramic powder by using a 200-mesh screen, then roughly mixing the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent, and finely mixing the mixture by using a vertical hammer mill mixer after rough mixing, wherein the aperture of the screen of the vertical hammer mill mixer is 0.5mm, the rotating speed of the vertical hammer mill mixer is 1500r/min, and the mixing frequency is 15 times; wherein the mass percent of the polytetrafluoroethylene suspension resin is 95%, the mass percent of the ceramic powder is 4.5%, and the mass percent of the high-temperature dispersing agent is 0.5%;
(3) pouring the mixture after the fine mixing into a mould, pressing into a hollow cylindrical blank, wherein the pressing pressure is 20MPa, the pressure maintaining time is 1h, the pressure is removed after 30min, and demoulding is carried out to obtain a ceramic membrane blank, wherein the outer diameter of the ceramic membrane blank is 560mm, and the height of the ceramic membrane blank is more than or equal to 500 mm;
(4) putting the ceramic membrane blank into a blast sintering furnace for sintering, wherein the whole sintering process comprises three stages of heating, heat preservation and cooling, the heating stage and the cooling stage are both required to be slow, the uniformity of the temperature of the ceramic blank is ensured, and the heat preservation time is enough for the ceramic blank to be completely sintered; in the embodiment, a horizontal rotary sintering technology of the cylindrical blank is adopted, namely, the ceramic membrane blank is horizontally and rotatably sintered in a blast sintering furnace at 40 ℃ without rotation, the rotating speed is 1r/h at 40-360 ℃, and the rotating speed is 2r/h in the cooling process;
(5) and (2) placing the sintered ceramic membrane blank in a 90 ℃ heat preservation furnace for heat preservation, taking out the ceramic membrane blank from the heat preservation furnace after the temperature of the ceramic membrane blank is uniform, jacking a special core shaft into a central hole of the ceramic membrane blank, installing the ceramic membrane blank on a rotary cutter, and carrying out rotary cutting on the ceramic membrane blank according to the set membrane thickness and the set turning speed to obtain the ceramic modified PTFE membrane, wherein the thickness of the ceramic modified PTFE membrane is 0.1 mm.
Example 2:
a processing method of a ceramic modified PTFE film for a 5G high-frequency copper-clad plate comprises the following steps:
(1) carrying out high-temperature heat treatment on ceramic powder, wherein the particle size of the ceramic powder is D503 um, the heat treatment temperature is 500 ℃, and the heat treatment time is 48 h;
(2) sieving the treated ceramic powder by using a 200-mesh screen, then roughly mixing the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent, and finely mixing the mixture by using a vertical hammer mill mixer after rough mixing, wherein the aperture of the screen of the vertical hammer mill mixer is 0.8mm, the rotating speed of the vertical hammer mill mixer is 2000r/min, and the mixing frequency is 10 times; the mass percent of the polytetrafluoroethylene suspension resin is 80%, the mass percent of the ceramic powder is 17%, and the mass percent of the high-temperature dispersing agent is 3%;
(3) pouring the mixture after the fine mixing into a mould, pressing into a hollow cylindrical blank, wherein the pressing pressure is 25MPa, the pressure maintaining time is 2h, the pressure is removed after 30min, and demoulding is carried out to obtain a ceramic membrane blank, wherein the outer diameter of the ceramic membrane blank is 570mm, and the height of the ceramic membrane blank is more than or equal to 500 mm;
(4) putting the ceramic membrane blank into a blast sintering furnace for sintering, wherein the whole sintering process comprises three stages of heating, heat preservation and cooling, the heating stage and the cooling stage are both required to be slow, the uniformity of the temperature of the ceramic blank is ensured, and the heat preservation time is enough for the ceramic blank to be completely sintered; in the embodiment, a horizontal rotary sintering technology of the cylindrical blank is adopted, namely, the ceramic membrane blank is horizontally and rotatably sintered in a blast sintering furnace at 40 ℃ without rotation, the rotating speed is 2r/h at 40-360 ℃, and the rotating speed is 3r/h in the cooling process;
(5) and (2) placing the sintered ceramic membrane blank in a 90 ℃ heat preservation furnace for heat preservation, taking out the ceramic membrane blank from the heat preservation furnace after the temperature of the ceramic membrane blank is uniform, jacking a special core shaft into a central hole of the ceramic membrane blank, installing the ceramic membrane blank on a rotary cutter, and carrying out rotary cutting on the ceramic membrane blank according to the set membrane thickness and the set turning speed to obtain the ceramic modified PTFE membrane, wherein the thickness of the ceramic modified PTFE membrane is 0.1 mm.
Example 3:
a processing method of a ceramic modified PTFE film for a 5G high-frequency copper-clad plate comprises the following steps:
(1) carrying out high-temperature heat treatment on ceramic powder, wherein the particle size of the ceramic powder is D506 um, the heat treatment temperature is 600 ℃, and the heat treatment time is 24 h;
(2) sieving the treated ceramic powder by using a 200-mesh screen, then roughly mixing the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent, and finely mixing the mixture by using a vertical hammer mill mixer after rough mixing, wherein the aperture of the screen of the vertical hammer mill mixer is 1.0mm, the rotating speed of the vertical hammer mill mixer is 3600r/min, and the mixing frequency is 5 times; the mass percent of the polytetrafluoroethylene suspension resin is 65%, the mass percent of the ceramic powder is 30%, and the mass percent of the high-temperature dispersing agent is 5%;
(3) pouring the mixture after the fine mixing into a mould, pressing into a hollow cylindrical blank, wherein the pressing pressure is 30MPa, the pressure maintaining time is 3h, the pressure is removed after 30min, and demoulding is carried out to obtain a ceramic membrane blank, wherein the outer diameter of the ceramic membrane blank is 580mm, and the height of the ceramic membrane blank is more than or equal to 500 mm;
(4) putting the ceramic membrane blank into a blast sintering furnace for sintering, wherein the whole sintering process comprises three stages of heating, heat preservation and cooling, the heating stage and the cooling stage are both required to be slow, the uniformity of the temperature of the ceramic blank is ensured, and the heat preservation time is enough for the ceramic blank to be completely sintered; in the embodiment, a horizontal rotary sintering technology of the cylindrical blank is adopted, namely, the ceramic membrane blank is horizontally and rotatably sintered in a blast sintering furnace at 40 ℃ without rotation, the rotating speed is 3r/h at 40-360 ℃, and the rotating speed is 4r/h in the cooling process;
(5) and (2) placing the sintered ceramic membrane blank in a heat preservation furnace at 100 ℃ for heat preservation, taking out the ceramic membrane blank from the heat preservation furnace after the temperature of the ceramic membrane blank is uniform, jacking a special core shaft into a central hole of the ceramic membrane blank, installing the ceramic membrane blank on a rotary cutter, and carrying out rotary cutting on the ceramic membrane blank according to the set membrane thickness and the set turning speed to obtain the ceramic modified PTFE membrane, wherein the thickness of the ceramic modified PTFE membrane is 0.1 mm.
In the above embodiments, micron-sized ceramic powder is selected to prepare the ceramic modified PTFE film (or the ceramic filled PTFE film), and preferably, ceramic powder with a particle size of 1um to 6um is selected, the volume-to-mass ratio of the ceramic powder with the same mass percentage as the nanoscale ceramic powder is increased, which is not favorable for the dispersion of the ceramic powder, the dielectric constant and the dielectric loss cannot be achieved when the ceramic powder with the particle size higher than 6um is added with the same mass percentage, and the ceramic powder falls off to form pores during film formation.
In the above embodiment, the heat treatment temperature for the high-temperature heat treatment of the ceramic powder is 400-600 ℃, the time is 24-72 h, the substances such as the surface coupling agent and the like are selectively removed, part of the active groups are reserved, and the problem that the ceramic powder is not well dispersed in the process of agglomerating and mixing the materials is avoided.
In the above examples, the main component of the high temperature dispersant was titanate.
In the embodiment, the horizontal rotary sintering technology of the cylindrical blank is adopted, the roller spacing of a driving device for driving the blank to rotate is 400-700 mm, the blank does not rotate at 40 ℃, the rotating speed of the blank is 1-3 r/h at 40-360 ℃, the rotating speed of the blank is 2-4 r/h at the time of cooling, the stress residue of the copper-clad plate substrate film in the XY direction is avoided, and the preparation of the ceramic modified PTFE film for the high-frequency copper-clad plate with the thickness of 0.015-10 mm is realized.
In the embodiment, the preferable mass percentage of the polytetrafluoroethylene suspension resin is 65-95%, the preferable mass percentage of the ceramic powder is 4.5-30%, and the preferable mass percentage of the high-temperature dispersing agent is 0.5-5%. The thermal expansion coefficient can reach 15-30 ppm/DEG C, the dielectric constant of a single-layer film and a laminated film at 10GHz can be regulated to 2.6-3.2, the loss factor is less than 0.0015, the proportion of surface hydroxyl groups is reduced by adopting a high-heat treatment ceramic powder method, the CAF (conductive anode wire) resistance of a high-frequency copper-clad plate is improved, and a PCB prepared by using the ceramic modified PTFE film meets the CTI (tracking index) of more than 600V.
The scope of the present invention includes, but is not limited to, the above embodiments, and the present invention is defined by the appended claims, and any alterations, modifications, and improvements that may occur to those skilled in the art are all within the scope of the present invention.
Claims (7)
1. A processing method of a ceramic modified PTFE film for a 5G high-frequency copper-clad plate is characterized by comprising the following steps: the method comprises the following steps:
(1) carrying out high-temperature heat treatment on the ceramic powder;
(2) sieving the treated ceramic powder by using a screen, and mixing the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent;
(3) pouring the mixed mixture into a mold, pressing into a hollow cylindrical blank, and demolding the cylindrical blank to obtain a ceramic membrane blank;
(4) placing the ceramic membrane blank into a blast sintering furnace for sintering;
(5) and placing the sintered ceramic membrane blank in a heat preservation furnace for heat preservation, taking the ceramic membrane blank out of the heat preservation furnace after the temperature of the ceramic membrane blank is uniform, jacking a core shaft into a central hole of the ceramic membrane blank, and then carrying out rotary cutting on the ceramic membrane blank according to the set membrane thickness to obtain the ceramic modified PTFE membrane.
2. The processing method of the ceramic modified PTFE film for the 5G high-frequency copper-clad plate according to claim 1, which is characterized in that: the step (1) is specifically as follows:
carrying out high-temperature heat treatment on ceramic powder, wherein the particle size of the ceramic powder is 1-6 um, the heat treatment temperature is 400-600 ℃, and the heat treatment time is 24-72 h.
3. The processing method of the ceramic modified PTFE film for the 5G high-frequency copper-clad plate according to claim 2, which is characterized in that: the step (2) is specifically as follows:
sieving the treated ceramic powder by using a 200-mesh screen, then roughly mixing the polytetrafluoroethylene suspension resin, the ceramic powder and the high-temperature dispersing agent, and finely mixing the coarsely mixed powder by using a vertical hammer mill mixer, wherein the aperture of the screen of the vertical hammer mill mixer is 0.5-1.0 mm, the rotating speed of the vertical hammer mill mixer is 1500-3600 r/min, and the mixing times are 5-15 times.
4. The processing method of the ceramic modified PTFE film for the 5G high-frequency copper-clad plate according to claim 3, which is characterized in that: in the step (2), the mass percent of the polytetrafluoroethylene suspension resin is 65-95%, the mass percent of the ceramic powder is 4.5-30%, and the mass percent of the high-temperature dispersing agent is 0.5-5%.
5. The processing method of the ceramic modified PTFE film for the 5G high-frequency copper-clad plate according to claim 3, which is characterized in that: the step (3) is specifically as follows:
pouring the mixture after the fine mixing into a mould, pressing into a hollow cylindrical blank, wherein the pressing pressure is 20 MPa-30 MPa, the pressure maintaining time is 1h-3h, the pressure is removed after 30min, and demoulding is carried out to obtain a ceramic membrane blank, wherein the outer diameter of the ceramic membrane blank is 560 mm-580 mm, and the height of the ceramic membrane blank is more than or equal to 500 mm.
6. The processing method of the ceramic modified PTFE film for the 5G high-frequency copper-clad plate according to claim 5, which is characterized in that: the step (4) is specifically as follows:
the ceramic membrane blank is horizontally and rotatably sintered in a blast sintering furnace, the ceramic membrane blank does not rotate at the temperature of below 40 ℃, the rotating speed of the ceramic membrane blank is 1 r/h-3 r/h at the temperature of 40-360 ℃, and the rotating speed of the ceramic membrane blank is 2 r/h-4 r/h in the cooling process.
7. The processing method of the ceramic modified PTFE film for the 5G high-frequency copper-clad plate according to claim 6, which is characterized in that: the step (5) is specifically as follows:
and (2) placing the sintered ceramic membrane blank in a heat preservation furnace at 90-100 ℃ for heat preservation, taking out the ceramic membrane blank from the heat preservation furnace after the temperature of the ceramic membrane blank is uniform, jacking a special core shaft into a central hole of the ceramic membrane blank, installing the ceramic membrane blank on a rotary cutter, and carrying out rotary cutting on the ceramic membrane blank according to the set membrane thickness to obtain the ceramic modified PTFE membrane, wherein the thickness of the ceramic modified PTFE membrane is 0.1 mm.
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| CN202110560800.9A CN113183380A (en) | 2021-05-22 | 2021-05-22 | Processing method of ceramic modified PTFE film for 5G high-frequency copper-clad plate |
| PCT/CN2022/086689 WO2022247508A1 (en) | 2021-05-22 | 2022-04-13 | Method for processing ceramic modified ptfe film for 5g high-frequency copper-clad plate |
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| WO2022247508A1 (en) * | 2021-05-22 | 2022-12-01 | 南京肯特复合材料股份有限公司 | Method for processing ceramic modified ptfe film for 5g high-frequency copper-clad plate |
| CN115784744A (en) * | 2022-11-29 | 2023-03-14 | 天津氟膜新材料有限公司 | High-dielectric alloy composite film for high-frequency communication and preparation method thereof |
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| CN117565438B (en) * | 2024-01-16 | 2024-04-16 | 山东东岳高分子材料有限公司 | Preparation method and application of polytetrafluoroethylene film with frosted surface |
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