CN109320905A - A kind of electromagnetic shielding material of power equipment and preparation method thereof - Google Patents
A kind of electromagnetic shielding material of power equipment and preparation method thereof Download PDFInfo
- Publication number
- CN109320905A CN109320905A CN201811081233.3A CN201811081233A CN109320905A CN 109320905 A CN109320905 A CN 109320905A CN 201811081233 A CN201811081233 A CN 201811081233A CN 109320905 A CN109320905 A CN 109320905A
- Authority
- CN
- China
- Prior art keywords
- parts
- electromagnetic shielding
- power equipment
- master batch
- quartz
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
- C08L61/04—Condensation polymers of aldehydes or ketones with phenols only
- C08L61/16—Condensation polymers of aldehydes or ketones with phenols only of ketones with phenols
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Separation, Recovery Or Treatment Of Waste Materials Containing Plastics (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses a kind of electromagnetic shielding materials of power equipment, belong to technical field of electronic materials, including below according to the raw material of parts by weight: 85-95 parts of modified polyether ether ketone, electromagnetic shielding auxiliary agent 40-50 parts, 2-8 parts of water-based acrylic resin, 2.2-3.2 parts of antioxidant, 10-20 parts of quartz, rubber master batch 11-21 parts black, 3-9 parts of promotor, 10-25 parts of actinolite, it is rubber master batch 11-21 parts black, 15-25 parts of zircon sand, the invention also discloses the production methods of the electromagnetic shielding material of the power equipment;Raw material of the invention is easy to obtain, low manufacture cost;The present invention is added to black rubber master batch, has good insulation effect, greatly reduces resistivity, improve shield effectiveness;The present invention is added to zircon sand, improves the hardness of material, considerably increases its plasticity, while greatly improve electromagnet shield effect also.
Description
Technical field
The present invention relates to power electronics field of material technology, the electromagnetic shielding material of specifically a kind of power equipment and its
Production method.
Background technique
With the continuous development of society, people need to use miscellaneous electric appliance in life, it is therefore desirable to use very
More power equipments.And power equipment mainly includes two major classes, one is generating equipment, the other is power supply unit.Wherein generate electricity
Equipment mainly includes station boiler, steam turbine, gas turbine, the hydraulic turbine, generator, transformer etc.;And power supply unit
It mainly include the transmission line of electricity, mutual inductor, contactor etc. of various voltage class.And power equipment often produces at work
Raw many electromagnetic waves, electromagnetic wave have very big jamming performance to electronic instrument, electronic equipment etc., also will affect the body of people
Health.
Existing power equipment can not be carried out effectively the shortcomings that electromagnetic wave shielding, existing metal shielding setup, usually
Metal or plastics are made, and traditional pure metal electromagnetic screen scope of application is poor, and complex manufacturing technology is expensive, makes
Effectiveness with the plastics that are limited in scope is poor, is easily damaged, and practicability is lower, therefore the present invention proposes that one kind is at low cost
, material with low-resistivity, high electromagnet shield effect.
Summary of the invention
The purpose of the present invention is to provide electromagnetic shielding materials of a kind of power equipment and preparation method thereof, on solving
State the problem of proposing in background technique.
To achieve the above object, the invention provides the following technical scheme:
A kind of electromagnetic shielding material of power equipment, including below according to the raw material of parts by weight: modified polyether ether ketone 85-
95 parts, electromagnetic shielding auxiliary agent 40-50 parts, 2-8 parts of water-based acrylic resin, 2.2-3.2 parts of antioxidant, 10-20 parts of quartz, black mother
11-21 parts of glue, 3-9 parts of promotor, 10-25 parts of actinolite, it is rubber master batch 11-21 parts black, 15-25 parts of zircon sand.
As a further solution of the present invention: the antioxidant is BHT.
As a further solution of the present invention: the promotor is zinc Isoocatanoate.
As a further solution of the present invention: the electromagnetic shielding auxiliary agent, the raw material including following parts by weight: magnetic powder
30-40 parts, 10-20 parts of quartz, 5-15 parts of waste ceramic powder.
As a further solution of the present invention: the electromagnetic shielding auxiliary agent the production method is as follows:
S1, quartz is weighed, is crushed using pulverizer, discharging-material size is 100-200 mesh, is placed in container;
S2, waste ceramic powder is added in heating furnace, begins to warm up, temperature control is 1300-1400 DEG C, heats 10-
15min;
S3, investment quartz powder and magnetic powder continue to heat 15-20min, then cool down to room temperature.
As a further solution of the present invention: the preparation method of the electromagnetic shielding material of the power equipment, step is such as
Under:
S11, modified polyether ether ketone, antioxidant, quartz, black rubber master batch, promotor, actinolite, black rubber master batch, zircon sand are weighed,
It is added in pulverizer and is crushed, discharging-material size is 150-250 mesh;
Mixture smashed in S11 is placed in high-speed mixer by S12, while electromagnetic shielding auxiliary agent, aqueous third is added
Olefin(e) acid resin, starting high-speed mixer are stirred, and control mixing speed is 5000-6000 rpms;
S13 adds twin-screw extrude mixture made from S12, and controlling each section of extrusion temperature is 190-220 DEG C,
Screw speed is 200-240 rpms, and extruding pelletization is up to power equipment electromagnetic shielding material.
Compared with prior art, the beneficial effects of the present invention are:
1, raw material of the invention is easy to obtain, low manufacture cost;
2, the present invention is added to black rubber master batch, has good insulation effect, greatly reduces resistivity, mention shield effectiveness
It is high;
3, the present invention is added to zircon sand, improves the hardness of material, considerably increases its plasticity, while making to be electromagnetically shielded
Efficiency also greatly improves.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
A kind of electromagnetic shielding material of power equipment, including below according to the raw material of parts by weight: modified polyether ether ketone 85
Part, 40 parts of auxiliary agent of electromagnetic shielding, 2 parts of water-based acrylic resin, 2.2 parts of antioxidant, quartzy 10 parts, 11 parts of black rubber master batch, promotor 3
Part, 10 parts of actinolite, 11 parts of black rubber master batch, 15 parts of zircon sand.
In the embodiment of the present invention, the antioxidant is BHT.
In the embodiment of the present invention, the promotor is zinc Isoocatanoate.
In the embodiment of the present invention, the electromagnetic shielding auxiliary agent, the raw material including following parts by weight: 30 parts of magnetic powder, quartz
10 parts, 5 parts of waste ceramic powder.
In the embodiment of the present invention, the electromagnetic shielding auxiliary agent the production method is as follows:
S1, quartz is weighed, is crushed using pulverizer, discharging-material size is 100 mesh, is placed in container;
S2, waste ceramic powder is added in heating furnace, begins to warm up, temperature control is 1300 DEG C, heats 10min;
S3, investment quartz powder and magnetic powder continue to heat 15min, then cool down to room temperature.
In the embodiment of the present invention, the preparation method of the electromagnetic shielding material of the power equipment, steps are as follows:
S11, modified polyether ether ketone, antioxidant, quartz, black rubber master batch, promotor, actinolite, black rubber master batch, zircon sand are weighed,
It is added in pulverizer and is crushed, discharging-material size is 150 mesh;
Mixture smashed in S11 is placed in high-speed mixer by S12, while electromagnetic shielding auxiliary agent, aqueous third is added
Olefin(e) acid resin, starting high-speed mixer are stirred, and control mixing speed is 5000 rpms;
S13 adds twin-screw extrude mixture made from S12, and controlling each section of extrusion temperature is 190 DEG C, screw rod
Revolving speed is 200 rpms, and extruding pelletization is up to power equipment electromagnetic shielding material.
Embodiment 2
A kind of electromagnetic shielding material of power equipment, including below according to the raw material of parts by weight: modified polyether ether ketone 88
Part, 42 parts of auxiliary agent of electromagnetic shielding, 4 parts of water-based acrylic resin, 2.5 parts of antioxidant, quartzy 13 parts, 14 parts of black rubber master batch, promotor 5
Part, 14 parts of actinolite, 14 parts of black rubber master batch, 18 parts of zircon sand.
In the embodiment of the present invention, the antioxidant is BHT.
In the embodiment of the present invention, the promotor is zinc Isoocatanoate.
In the embodiment of the present invention, the electromagnetic shielding auxiliary agent, the raw material including following parts by weight: 33 parts of magnetic powder, quartz
13 parts, 8 parts of waste ceramic powder.
In the embodiment of the present invention, the electromagnetic shielding auxiliary agent the production method is as follows:
S1, quartz is weighed, is crushed using pulverizer, discharging-material size is 120 mesh, is placed in container;
S2, waste ceramic powder is added in heating furnace, begins to warm up, temperature control is 1320 DEG C, heats 14min;
S3, investment quartz powder and magnetic powder continue to heat 18min, then cool down to room temperature.
In the embodiment of the present invention, the preparation method of the electromagnetic shielding material of the power equipment, steps are as follows:
S11, modified polyether ether ketone, antioxidant, quartz, black rubber master batch, promotor, actinolite, black rubber master batch, zircon sand are weighed,
It is added in pulverizer and is crushed, discharging-material size is 160 mesh;
Mixture smashed in S11 is placed in high-speed mixer by S12, while electromagnetic shielding auxiliary agent, aqueous third is added
Olefin(e) acid resin, starting high-speed mixer are stirred, and control mixing speed is 5200 rpms;
S13 adds twin-screw extrude mixture made from S12, and controlling each section of extrusion temperature is 200 DEG C, screw rod
Revolving speed is 210 rpms, and extruding pelletization is up to power equipment electromagnetic shielding material.
Embodiment 3
A kind of electromagnetic shielding material of power equipment, including below according to the raw material of parts by weight: modified polyether ether ketone 92
Part, 45 parts of auxiliary agent of electromagnetic shielding, 6 parts of water-based acrylic resin, 2.7 parts of antioxidant, quartzy 16 parts, 17 parts of black rubber master batch, promotor 7
Part, 21 parts of actinolite, 17 parts of black rubber master batch, 19 parts of zircon sand.
In the embodiment of the present invention, the antioxidant is BHT.
In the embodiment of the present invention, the promotor is zinc Isoocatanoate.
In the embodiment of the present invention, the electromagnetic shielding auxiliary agent, the raw material including following parts by weight: 37 parts of magnetic powder, quartz
16 parts, 11 parts of waste ceramic powder.
In the embodiment of the present invention, the electromagnetic shielding auxiliary agent the production method is as follows:
S1, quartz is weighed, is crushed using pulverizer, discharging-material size is 160 mesh, is placed in container;
S2, waste ceramic powder is added in heating furnace, begins to warm up, temperature control is 1360 DEG C, heats 14min;
S3, investment quartz powder and magnetic powder continue to heat 17min, then cool down to room temperature;
In the embodiment of the present invention, the preparation method of the electromagnetic shielding material of the power equipment, steps are as follows:
S11, modified polyether ether ketone, antioxidant, quartz, black rubber master batch, promotor, actinolite, black rubber master batch, zircon sand are weighed,
It is added in pulverizer and is crushed, discharging-material size is 210 mesh;
Mixture smashed in S11 is placed in high-speed mixer by S12, while electromagnetic shielding auxiliary agent, aqueous third is added
Olefin(e) acid resin, starting high-speed mixer are stirred, and control mixing speed is 5600 rpms;
S13 adds twin-screw extrude mixture made from S12, and controlling each section of extrusion temperature is 210 DEG C, screw rod
Revolving speed is 230 rpms, and extruding pelletization is up to power equipment electromagnetic shielding material.
Embodiment 4
A kind of electromagnetic shielding material of power equipment, including below according to the raw material of parts by weight: modified polyether ether ketone 95
Part, 50 parts of auxiliary agent of electromagnetic shielding, 8 parts of water-based acrylic resin, 3.2 parts of antioxidant, quartzy 20 parts, 21 parts of black rubber master batch, promotor 9
Part, 25 parts of actinolite, 21 parts of black rubber master batch, 25 parts of zircon sand.
In the embodiment of the present invention, the antioxidant is BHT.
In the embodiment of the present invention, the promotor is zinc Isoocatanoate.
In the embodiment of the present invention, the electromagnetic shielding auxiliary agent, the raw material including following parts by weight: 40 parts of magnetic powder, quartz
20 parts, 15 parts of waste ceramic powder.
In the embodiment of the present invention, the electromagnetic shielding auxiliary agent the production method is as follows:
S1, quartz is weighed, is crushed using pulverizer, discharging-material size is 200 mesh, is placed in container;
S2, waste ceramic powder is added in heating furnace, begins to warm up, temperature control is 1400 DEG C, heats 15min;
S3, investment quartz powder and magnetic powder continue to heat 20min, then cool down to room temperature;
In the embodiment of the present invention, the preparation method of the electromagnetic shielding material of the power equipment, steps are as follows:
S11, modified polyether ether ketone, antioxidant, quartz, black rubber master batch, promotor, actinolite, black rubber master batch, zircon sand are weighed,
It is added in pulverizer and is crushed, discharging-material size is 250 mesh;
Mixture smashed in S11 is placed in high-speed mixer by S12, while electromagnetic shielding auxiliary agent, aqueous third is added
Olefin(e) acid resin, starting high-speed mixer are stirred, and control mixing speed is 6000 rpms;
S13 adds twin-screw extrude mixture made from S12, and controlling each section of extrusion temperature is 220 DEG C, screw rod
Revolving speed is 240 rpms, and extruding pelletization is up to power equipment electromagnetic shielding material.
Comparative example 1
Comparative example 1 and the difference of embodiment 3 are, do not add black rubber master batch, remaining is the same as embodiment 3.
Comparative example 2
Comparative example 2 and the difference of embodiment 3 are, do not add zircon sand, remaining is the same as embodiment 3.
Comparative example 3
Comparative example 3 and the difference of embodiment 3 are, do not add black rubber master batch and zircon sand, remaining is the same as embodiment 3.
Embodiment 1-4 and the resulting material of comparative example 1-3 are tested for the property, test method are as follows: detection insulation respectively
Surface resistivity, the surface resistivity of lower surface of electromagnetic shielding material upper surface, each material of re-test is in wave frequency
For the electromagnet shield effect under 0.5MHz~1.5GHz;Commercially a kind of common battery shields commodity simultaneously, as
Control group is tested for the property, the result is as follows:
As can be known from the above table, resistivity of the present invention is low, and has good electromagnet shield effect.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (7)
1. a kind of electromagnetic shielding material of power equipment, which is characterized in that including below according to the raw material of parts by weight: modified poly-
85-95 parts of ether ether ketone, electromagnetic shielding auxiliary agent 40-50 parts, 2-8 parts of water-based acrylic resin, 2.2-3.2 parts of antioxidant, quartz 10-
20 parts, rubber master batch 11-21 parts black, 3-9 parts of promotor, 10-25 parts of actinolite, it is rubber master batch 11-21 parts black, 15-25 parts of zircon sand.
2. the electromagnetic shielding material of power equipment according to claim 1, which is characterized in that the antioxidant is BHT.
3. the electromagnetic shielding material of power equipment according to claim 2, which is characterized in that the promotor is different pungent
Sour zinc.
4. the electromagnetic shielding material of power equipment according to claim 3, which is characterized in that the electromagnetic shielding helps
Agent, the raw material including following parts by weight: 30-40 parts of magnetic powder, 10-20 parts of quartz, 5-15 parts of waste ceramic powder.
5. the electromagnetic shielding material and preparation method thereof of power equipment according to claim 4, which is characterized in that described
Electromagnetic shielding auxiliary agent the production method is as follows:
S1, quartz is weighed, is crushed using pulverizer, discharging-material size is 100-200 mesh, is placed in container;
S2, waste ceramic powder is added in heating furnace, begins to warm up, temperature control is 1300-1400 DEG C, heats 10-
15min;
S3, investment quartz powder and magnetic powder continue to heat 15-20min, then cool down to room temperature.
6. the production method of the electromagnetic shielding material of power equipment a method as claimed in any one of claims 1 to 5, which is characterized in that step
It is rapid as follows:
S11, modified polyether ether ketone, antioxidant, quartz, black rubber master batch, promotor, actinolite, black rubber master batch, zircon sand are weighed, be added
It is crushed in pulverizer, discharging-material size is 150-250 mesh;
Mixture smashed in S11 is placed in high-speed mixer by S12, while electromagnetic shielding auxiliary agent, water soluble acrylic acid is added
Resin, starting high-speed mixer are stirred, and control mixing speed is 5000-6000 rpms;
S13 adds twin-screw extrude mixture made from S12, and controlling each section of extrusion temperature is 190-220 DEG C, screw rod
Revolving speed is 200-240 rpms, and extruding pelletization is up to power equipment electromagnetic shielding material.
7. purposes of the electromagnetic shielding material of power equipment a method as claimed in any one of claims 1 to 5 in power equipment.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201811081233.3A CN109320905A (en) | 2018-09-17 | 2018-09-17 | A kind of electromagnetic shielding material of power equipment and preparation method thereof |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN201811081233.3A CN109320905A (en) | 2018-09-17 | 2018-09-17 | A kind of electromagnetic shielding material of power equipment and preparation method thereof |
Publications (1)
Publication Number | Publication Date |
---|---|
CN109320905A true CN109320905A (en) | 2019-02-12 |
Family
ID=65265624
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN201811081233.3A Pending CN109320905A (en) | 2018-09-17 | 2018-09-17 | A kind of electromagnetic shielding material of power equipment and preparation method thereof |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN109320905A (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5066424A (en) * | 1990-06-20 | 1991-11-19 | The United States Of America As Represented By The Secretary Of The Navy | Composite material for EMI/EMP hardening protection in marine environments |
CN102321338A (en) * | 2011-07-15 | 2012-01-18 | 吉林大学 | Polyetheretherketone-base composite electromagnetic shielding material and preparation method thereof |
CN105524415A (en) * | 2015-11-03 | 2016-04-27 | 南京肯特复合材料有限公司 | Electromagnetic shielding PEEK/PTFE composite material and preparation method thereof |
CN105524408A (en) * | 2015-11-03 | 2016-04-27 | 南京肯特复合材料有限公司 | Electromagnetic shielding PEEK composite material and preparation method thereof |
CN106883551A (en) * | 2017-03-24 | 2017-06-23 | 合肥羿振电力设备有限公司 | A kind of power equipment electromagnetic shielding material and preparation method thereof |
-
2018
- 2018-09-17 CN CN201811081233.3A patent/CN109320905A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5066424A (en) * | 1990-06-20 | 1991-11-19 | The United States Of America As Represented By The Secretary Of The Navy | Composite material for EMI/EMP hardening protection in marine environments |
CN102321338A (en) * | 2011-07-15 | 2012-01-18 | 吉林大学 | Polyetheretherketone-base composite electromagnetic shielding material and preparation method thereof |
CN105524415A (en) * | 2015-11-03 | 2016-04-27 | 南京肯特复合材料有限公司 | Electromagnetic shielding PEEK/PTFE composite material and preparation method thereof |
CN105524408A (en) * | 2015-11-03 | 2016-04-27 | 南京肯特复合材料有限公司 | Electromagnetic shielding PEEK composite material and preparation method thereof |
CN106883551A (en) * | 2017-03-24 | 2017-06-23 | 合肥羿振电力设备有限公司 | A kind of power equipment electromagnetic shielding material and preparation method thereof |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN105111913B (en) | Graphene/nanometer ferrite base aqueous electromagnetic shielding coating and preparation method thereof | |
CN101179921B (en) | Method for preparing electromagnetic shielding light graphite based nanometer magnetic metal composite material | |
CN108947376A (en) | A kind of cement mortar and preparation method thereof | |
CN105776193B (en) | A kind of method that graphene microchip is prepared using high voltage pulse water jet mill | |
CN107082953A (en) | Inhale ripple, guided wave PP foam material and preparation method thereof | |
CN103409669A (en) | MnAl alloy magnetic absorbing material and preparation method thereof | |
CN103694860B (en) | A kind of transformer acetal wire enamel meeting 155 DEG C and above thermal level and preparation method thereof | |
CN103170635A (en) | Method for preparing spherical molybdenum powder | |
CN104629643B (en) | Conducting resinl, its preparation method and wiring board | |
CN106065234A (en) | A kind of disinfection cabinet outer surface powdery paints and preparation method thereof | |
CN109320905A (en) | A kind of electromagnetic shielding material of power equipment and preparation method thereof | |
CN103740328A (en) | Grinding aid and preparation method thereof | |
CN104497796A (en) | High weather-resistant and anti-interference anticorrosive paint for power distribution cabinet | |
CN106117848A (en) | A kind of preparation method of Halogen activated carbon synergistic expandable flame retardant rubber | |
CN102002262A (en) | Auxiliary grinding and modifying agent and preparation method thereof | |
CN103525223A (en) | Waterborne conductive coating composition for electromagnetic shielding as well as preparation method thereof | |
CN110769663B (en) | Recyclable liquid metal slurry for electromagnetic shielding and preparation method and application thereof | |
CN108192387A (en) | A kind of composite coating and preparation method for being used to protect medium-high frequency electromagenetic wave radiation | |
CN105255330B (en) | A kind of preparation method of carbon fiber thermal solidity powder electromagnetic shielding coating | |
CN104479521A (en) | Electromagnetic-shielding-type corrosion-resistant paint with excellent heat-conducting property and preparation method thereof | |
CN102660225B (en) | Titanic iron ore grinding aid and preparation method | |
CN103146250B (en) | Preparation method of nano silver-tin-copper alloy conductive ink | |
CN104387641B (en) | A kind of modified rubber powder and its preparation method | |
CN105368251B (en) | A kind of extra-high voltage coatings and preparation method thereof | |
CN102516819A (en) | Active assist grinding modifier and preparation method thereof |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PB01 | Publication | ||
PB01 | Publication | ||
SE01 | Entry into force of request for substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
RJ01 | Rejection of invention patent application after publication | ||
RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190212 |