CN109401279A - A kind of resin base shielding material - Google Patents
A kind of resin base shielding material Download PDFInfo
- Publication number
- CN109401279A CN109401279A CN201811578262.0A CN201811578262A CN109401279A CN 109401279 A CN109401279 A CN 109401279A CN 201811578262 A CN201811578262 A CN 201811578262A CN 109401279 A CN109401279 A CN 109401279A
- Authority
- CN
- China
- Prior art keywords
- parts
- component
- resin
- shielding material
- resin base
- 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
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
-
- 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
-
- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present invention relates to a kind of resin base shielding materials.Its used each component includes: environment-friendly resin by weight, lanthana, samarium oxide, lithium stearate, silane coupling agent, polyether polyol, dialkyl dithio amino formate.A kind of resin base shielding material of the present invention; using renewable polyalcohol as production raw material; be conducive to environmental protection; each component is uniformly dispersed in resin binder; make this material durability with higher and shield effectiveness, so that ensure that has good using effect and service life using the Related product of this material.
Description
Technical field
The present invention relates to a kind of shielding material, specifically a kind of resin base shielding material.
Background technique
With the development of modern high technology, electromagnetic interference (EMI) and electromagnetic compatibility (EMC) problem day caused by electromagnetic wave
It is beneficial serious, not only electronic instrument, equipment are interfered and damaged, its normal T is influenced and makees, it is serious to restrict China's electronic product
It with the international competitiveness of equipment, and pollutes the environment, endangers human health；In addition electromagnetic-wave leakage can also jeopardize state's letter from home
The safety of breath safety and military vital strategic secrets.Substance is had been achieved with especially as the electromagnetic pulse weapon of new concept weapon
It breaks through, electronic equipment, electric system etc. can directly be hit, cause the temporary failure or permanent damage of information system etc.
It is bad, mode multiplicity is delivered, destructive power is extremely strong, and powerful electromagnetic pulse can also damage human body, and it is disorderly to make one nerve
Disorderly, behavior is out of control etc..
Therefore, efficient electromagnetic shielding material is explored, electromagnetic interference caused by electromagnetic wave and electromagnetic compatibility problem are prevented, it is right
In the security reliability for improving electronic product and equipment, international competitiveness is promoted, the strike of electromagnetic pulse weapon is prevented, it is ensured that letter
The safe and smooth of message communication system, network system, Transmission system, weapon platform etc. all has important meaning.In view of electromagnetic screen
Important function of the material in social life, economic construction and national defense construction is covered, research and development more become concerned by people important
Project.
CN108811502A discloses a kind of hot radiation shielding particle, hot radiation shielding particle dispersion liquid, hot radiation shielding film, heat
Line shield glass, hot radiation shielding dispersion and hot radiation shielding interlayer transparent substrate.When it is suitable for structures such as window materials, heat is played
The characteristic of line shielding and while inhibit skin burns sense, is able to use through the structure, the hot radiation shielding film or hot line screen
Cover glass, the dispersion and interlayer transparent substrate near infrared light communication equipment and picture pick-up device, sensor etc..One kind is provided
Hot radiation shielding particle, hot radiation shielding particle dispersion liquid, hot radiation shielding film, hot radiation shielding glass, hot radiation shielding dispersion and hot line
Shield interlayer transparent substrate.Wherein, hot radiation shielding particle is the composite tungsten oxide fine particle with hot radiation shielding function, is only calculated
When the composite tungsten oxide fine particle show that transmission of visible light is 85% to the absorption of light, in the range of 800~900nm of wavelength
The average value of transmissivity be 30% or more and 60% hereinafter, and the transmissivity in the range of 1200~1500nm of wavelength average value
For 20% hereinafter, and the transmissivity of wavelength 2100nm is 22% or less.
C CN101611160B discloses a kind of excellent magnetic shielding material and use of the electromagnetic shielding performance under low magnetic field region
Its magnetic shielding part and magnetic shield room.One kind is in terms of quality %, Ni:70.0~85.0%, Cu:6.0% or less, Mo:
10.0% or less, Mn:2.0% is hereinafter, the magnetic shielding material that surplus is substantially made of Fe, is opposite under the 0.05A/m of magnetic field
Magnetic permeability μ r is 40,000 or more, relict flux density Br and maximum in the direct current B-H loop of maximum externally-applied magnetic field 0.8A/m
The squareness ratio Br/B0.8 of magnetic flux density B0.8 is 0.85 magnetic shielding material below.
Resin base shielding material has stickiness stronger, processes easier advantage, but also has filler dispersion simultaneously not
Uniformly, the defect weakened so as to cause mechanical property and shield effectiveness.
Summary of the invention
For the above problem in the prior art, the present invention provides a kind of resin base shielding material:
A kind of resin base shielding material, used each component and the ratio of each component is: by weight, environment-friendly resin
100 parts, 20-48 parts of lanthana, 8-14 parts of samarium oxide, 2-6 parts of lithium stearate, 0.8-1.5 parts of silane coupling agent, polyether polyol
0.8-1.6 parts, 0.08-0.2 parts of dialkyl dithio amino formate.
The silane coupling agent is that γ-aminopropyl trimethoxysilane or aminopropyl triethoxysilane or 3- shrink
Glyceryl etheroxypropyltrimethoxysilane or γ-methacryloxypropyl trimethoxy silane.
The polyether polyol is high molecular weight polyether, molecular weight 10000-30000.
The environment-friendly resin, preparation method are as follows: by weight, soybean oil polyol 100 is added in a kettle
Part, then vacuum dehydration 0.5-1.5h is added hexamethylene diisocyanate 12-25 parts, methyl diphenylene diisocyanate 20-
40 parts, 0.6-1.2 parts of rare earth compound additive, 100-300 parts of n,N-Dimethylformamide, 2-4h is kept the temperature at 78-88 DEG C,
Chain extender is added, reacts 2-5h, product obtains environment-friendly resin product through drying, washing.
The rare earth compound additive, used each component and the ratio of each component is: two fourth of tin dilaurate
100 parts of base tin, 20-40 parts of different Fu Er ketone diamines, three 0.18-0.4 parts of (8-hydroxyquinoline)-galliums, three (detergent alkylate of isopropyl
Sulfonyl) 0.08-0.2 parts of titanate esters, 0.04-0.12 parts of phosphine nitrile of poly- two (ethyoxyl pyrrolidones), the iodo- 5- (three of 2- amino -3-
Methyl fluoride) 0.06-0.15 parts of pyridine.
A kind of resin base shielding material of the present invention, using reproducible soybean oil polyol as production former material
Material, is conducive to environmental protection, and each component is uniformly dispersed in resin binder, makes this material durability with higher and shielding effect
Fruit, so that ensure that has good using effect and service life using the Related product of this material.
Specific embodiment
Below by specific embodiment, the present invention will be further described:
Embodiment 1
A kind of resin base shielding material, used each component and the ratio of each component is: by weight, environment-friendly resin
100 parts, 34 parts of lanthana, 11 parts of samarium oxide, 4 parts of lithium stearate, 1.15 parts of γ-aminopropyl trimethoxysilane, polyether polyols
1.2 parts of alcohol, 0.14 part of dialkyl dithio amino formate.
The environment-friendly resin, preparation method are as follows: by weight, soybean oil polyol 100 is added in a kettle
Part, vacuum dehydration 1h, then 16.5 parts of hexamethylene diisocyanate of addition, 30 parts of methyl diphenylene diisocyanate, rare earth
0.9 part of compound additive, 200 parts of n,N-Dimethylformamide, 3h is kept the temperature at 83 DEG C, chain extender is added, reacts 3.5h, product
Through drying, washing obtains environment-friendly resin product.
The rare earth compound additive, used each component and the ratio of each component is: two fourth of tin dilaurate
100 parts of base tin, different 30 parts of Fu Er ketone diamines, three 0.29 part of (8-hydroxyquinoline)-galliums, isopropyl three (dodecyl benzenesulfonyl)
0.14 part of titanate esters, 0.08 part of phosphine nitrile of poly- two (ethyoxyl pyrrolidones), 2- amino -3- iodo- 5- (trifluoromethyl) pyridine 0.1
Part.
The average molecular weight of the polyether polyol is 25000.
The elongation rate of tensile failure that the method inspection institute that reference standard GB/T528 is provided obtains sample is 362%, and tensile strength is
The method inspection institute that 23.2MPa, reference standard GBZ/T147-2002 are provided obtains the lead equivalent of sample (thickness of sample 1.5mm)
It is 0.35.
Embodiment 2
A kind of resin base shielding material, used each component and the ratio of each component is: by weight, environment-friendly resin
100 parts, 20 parts of lanthana, 8 parts of samarium oxide, 2 parts of lithium stearate, 0.8 part of 3- glycidyl ether oxypropyltrimethoxysilane,
0.8 part of polyether polyol, 0.08 part of dialkyl dithio amino formate.
The environment-friendly resin, preparation method are as follows: by weight, soybean oil polyol 100 is added in a kettle
Part, vacuum dehydration 0.5h, then 12 parts of hexamethylene diisocyanate of addition, 20 parts of methyl diphenylene diisocyanate, rare earth
, 100 parts of n,N-Dimethylformamide, 2h is kept the temperature at 78 DEG C, chain extender is added, react 2h, product warp by 0.6 part of compound additive
Dry, washing obtains environment-friendly resin product.
The rare earth compound additive, used each component and the ratio of each component is: two fourth of tin dilaurate
100 parts of base tin, different 20 parts of Fu Er ketone diamines, three 0.18 part of (8-hydroxyquinoline)-galliums, isopropyl three (dodecyl benzenesulfonyl)
0.08 part of titanate esters, 0.04 part of phosphine nitrile of poly- two (ethyoxyl pyrrolidones), 2- amino -3- iodo- 5- (trifluoromethyl) pyridine 0.06
Part.
The molecular weight of the polyether polyol is 10000.
The elongation rate of tensile failure that the method inspection institute that reference standard GB/T528 is provided obtains sample is 356%, and tensile strength is
The method inspection institute that 22.7MPa, reference standard GBZ/T147-2002 are provided obtains the lead equivalent of sample (thickness of sample 1.5mm)
It is 0.33.
Embodiment 3
A kind of resin base shielding material, used each component and the ratio of each component is: by weight, environment-friendly resin
100 parts, 48 parts of lanthana, 14 parts of samarium oxide, 6 parts of lithium stearate, γ-methacryloxypropyl trimethoxy silane 1.5
Part, 1.6 parts of polyether polyol, 0.2 part of dialkyl dithio amino formate.
The environment-friendly resin, preparation method are as follows: by weight, soybean oil polyol 100 is added in a kettle
Part, vacuum dehydration 1.5h, then 25 parts of hexamethylene diisocyanate of addition, 40 parts of methyl diphenylene diisocyanate, rare earth
1.2 parts of compound additive, 300 parts of n,N-Dimethylformamide, 4h is kept the temperature at 88 DEG C, chain extender is added, reacts 5h, product
Through drying, washing obtains environment-friendly resin product.
The rare earth compound additive, used each component and the ratio of each component is: two fourth of tin dilaurate
100 parts of base tin, different 40 parts of Fu Er ketone diamines, three 0.4 part of (8-hydroxyquinoline)-galliums, isopropyl three (dodecyl benzenesulfonyl)
0.2 part of titanate esters, 0.12 part of phosphine nitrile of poly- two (ethyoxyl pyrrolidones), 2- amino -3- iodo- 5- (trifluoromethyl) pyridine 0.15
Part.
The molecular weight of the polyether polyol is 40000.
The elongation rate of tensile failure that the method inspection institute that reference standard GB/T528 is provided obtains sample is 371%, and tensile strength is
The method inspection institute that 24.9MPa, reference standard GBZ/T147-2002 are provided obtains the lead equivalent of sample (thickness of sample 1.5mm)
It is 0.36.
Comparative example 1
Three (8-hydroxyquinoline)-galliums are added without in the rare earth composite catalyst, other conditions are the same as embodiment 1.
The elongation rate of tensile failure that the method inspection institute that reference standard GB/T528 is provided obtains sample is 278%, and tensile strength is
The method inspection institute that 16.3MPa, reference standard GBZ/T147-2002 are provided obtains the lead equivalent of sample (thickness of sample 1.5mm)
It is 0.23.
Comparative example 2
Isopropyl three (dodecyl benzenesulfonyl) titanate esters are added without in the rare earth composite catalyst, other conditions are the same as real
Apply example 1.
The elongation rate of tensile failure that the method inspection institute that reference standard GB/T528 is provided obtains sample is 292%, and tensile strength is
The method inspection institute that 18.4MPa, reference standard GBZ/T147-2002 are provided obtains the lead equivalent of sample (thickness of sample 1.5mm)
It is 0.25.
Comparative example 3
Poly- two (ethyoxyl pyrrolidones) phosphine nitriles are added without in the rare earth composite catalyst, other conditions are the same as embodiment 1.
The elongation rate of tensile failure that the method inspection institute that reference standard GB/T528 is provided obtains sample is 305%, and tensile strength is
The method inspection institute that 19.0MPa, reference standard GBZ/T147-2002 are provided obtains the lead equivalent of sample (thickness of sample 1.5mm)
It is 0.26.
Comparative example 4
2- amino -3- iodo- 5- (trifluoromethyl) pyridine, the same embodiment of other conditions are added without in the rare earth composite catalyst
1。
The elongation rate of tensile failure that the method inspection institute that reference standard GB/T528 is provided obtains sample is 310%, and tensile strength is
The method inspection institute that 19.5MPa, reference standard GBZ/T147-2002 are provided obtains the lead equivalent of sample (thickness of sample 1.5mm)
It is 0.27.
Comparative example 5
Rare earth composite catalyst of the present invention is not used, is made using the dibutyl tin dilaurate of equivalent as catalyst
With other conditions are the same as embodiment 1.
The elongation rate of tensile failure that the method inspection institute that reference standard GB/T528 is provided obtains sample is 241%, and tensile strength is
The method inspection institute that 15.9MPa, reference standard GBZ/T147-2002 are provided obtains the lead equivalent of sample (thickness of sample 1.5mm)
It is 0.21.
Claims (5)
1. a kind of resin base shielding material, it is characterised in that its used each component and the ratio of each component is: by weight
Part meter, 100 parts of environment-friendly resin, 20-48 parts of lanthana, 8-14 parts of samarium oxide, 2-6 parts of lithium stearate, silane coupling agent 0.8-1.5
Part, 0.8-1.6 parts of polyether polyol, 0.08-0.2 parts of dialkyl dithio amino formate.
2. a kind of resin base shielding material according to claim 1, it is characterised in that: the silane coupling agent is γ-
Aminopropyl trimethoxysilane or aminopropyl triethoxysilane or 3- glycidyl ether oxypropyltrimethoxysilane or γ-
Methacryloxypropyl trimethoxy silane.
3. a kind of resin base shielding material according to claim 1, it is characterised in that: the polyether polyol is high score
Son amount polyether polyol, molecular weight 10000-40000.
4. a kind of resin base shielding material according to claim 1, it is characterised in that the environment-friendly resin, preparation side
Method are as follows: by weight, 100 parts of soybean oil polyol, vacuum dehydration 0.5-1.5h are added in a kettle, it is sub- to be then added six
12-25 parts of methyl diisocyanate, 20-40 parts of methyl diphenylene diisocyanate, 0.6-1.2 parts of rare earth compound additive, N,
100-300 parts of dinethylformamide, keep the temperature 2-4h at 78-88 DEG C, chain extender be added, react 2-5h, product through drying,
Washing obtains environment-friendly resin product.
5. a kind of environment-friendly resin according to claim 4, it is characterised in that the rare earth compound additive is used
Each component and the ratio of each component is: 100 parts of dibutyl tin dilaurate, 20-40 parts of different Fu Er ketone diamines, three (8- hydroxyls
Base quinoline) 0.18-0.4 parts of-gallium, 0.08-0.2 parts of titanate esters of isopropyl three (dodecyl benzenesulfonyl), poly- two (ethyoxyl pyrrole
Pyrrolidone) 0.04-0.12 parts of phosphine nitrile, 0.06-0.15 parts of (trifluoromethyl) pyridine of the iodo- 5- of 2- amino -3-.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578262.0A CN109401279A (en) | 2018-12-24 | 2018-12-24 | A kind of resin base shielding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811578262.0A CN109401279A (en) | 2018-12-24 | 2018-12-24 | A kind of resin base shielding material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109401279A true CN109401279A (en) | 2019-03-01 |
Family
ID=65460585
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811578262.0A Pending CN109401279A (en) | 2018-12-24 | 2018-12-24 | A kind of resin base shielding material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109401279A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1621719A1 (en) * | 2004-07-29 | 2006-02-01 | Bayer MaterialScience AG | Radiation shielding door elements comprising polyurethan foam |
| CN1789319A (en) * | 2004-12-14 | 2006-06-21 | 北京化工大学 | Rare earth modified leadless X-ray shielding plastic |
| US20090029147A1 (en) * | 2006-06-12 | 2009-01-29 | Aspen Aerogels, Inc. | Aerogel-foam composites |
| CN101572129A (en) * | 2009-06-15 | 2009-11-04 | 北京化工大学 | Overall lead-free X-ray shielding plastic compound material |
| CN107227454A (en) * | 2017-05-18 | 2017-10-03 | 江苏广川线缆股份有限公司 | A kind of Antiradiation composite |
-
2018
- 2018-12-24 CN CN201811578262.0A patent/CN109401279A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1621719A1 (en) * | 2004-07-29 | 2006-02-01 | Bayer MaterialScience AG | Radiation shielding door elements comprising polyurethan foam |
| CN1789319A (en) * | 2004-12-14 | 2006-06-21 | 北京化工大学 | Rare earth modified leadless X-ray shielding plastic |
| US20090029147A1 (en) * | 2006-06-12 | 2009-01-29 | Aspen Aerogels, Inc. | Aerogel-foam composites |
| CN101572129A (en) * | 2009-06-15 | 2009-11-04 | 北京化工大学 | Overall lead-free X-ray shielding plastic compound material |
| CN107227454A (en) * | 2017-05-18 | 2017-10-03 | 江苏广川线缆股份有限公司 | A kind of Antiradiation composite |
Non-Patent Citations (6)
| Title |
|---|
| 何领好，王明花主编: "《功能高分子材料》", 31 August 2016, 华中科技大学出版社 * |
| 刘力等: "氧化钐/热塑性聚氨酯复合材料的防辐射性能及流变性能 ", 《合成橡胶工业》 * |
| 徐克勋主编: "《有机化工原料及中间体便览》", 31 December 1988, 辽宁省石油化工技术情报总站 * |
| 朱洪法编著: "《精细化工产品、技术与配方》", 31 August 1998, 中国石化出版社 * |
| 陈鹏著: "《2-醛基-8-羟基喹啉稀土基配合物的合成、结构及光磁性质研究》", 31 March 2017, 黑龙江大学出版社 * |
| 韩长日，宋小平主编: "《橡塑助剂生产工艺与技术》", 30 November 2015, 科学技术文献出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106521691B (en) | Polyester fiber with flame-proof antibiotic characteristic and its application | |
| CN103626484B (en) | Wide-temperature-range nickel-zinc soft-magnetic ferrite and preparation method thereof | |
| CN104065774B (en) | A kind of Antiradiation mobile phone shell with signal enhancing function and preparation method thereof | |
| CN104017210B (en) | A kind of long chain type metal-complexing expansion type flame retardant and preparation method thereof | |
| CN109401279A (en) | A kind of resin base shielding material | |
| CN109624453A (en) | A kind of production technology of fire protection flame retarding tent cloth | |
| CN106810284A (en) | A kind of preparation method of double-deck high temperature resistant heat insulation Wave suction composite material | |
| CN103693951A (en) | Anti-electromagnetic interference manganese zinc ferrite material and preparation method thereof | |
| CN103709498A (en) | Jute-straw-containing non-woven fabric material for sound-absorbing cotton | |
| CN106893522A (en) | Electricity conductive cloth tape adhesive and electricity conductive cloth tape | |
| CN109626985B (en) | Ultrahigh frequency high-impedance MnZn ferrite material | |
| CN105255243A (en) | Radar wave absorbing coating and preparation method thereof | |
| CN104803669B (en) | A kind of wide-temperature low-distortion mangan zinc soft magnetic ferrite and preparation method thereof | |
| CN103805074B (en) | Nano palygorskite-modified flame-retardant adhesive | |
| CN207282239U (en) | A kind of high resistant patch resistor | |
| CN110136944A (en) | The production technology of low frequency common inductance | |
| CN101922115B (en) | Bismuth oxide-containing fabric flame retardant and cotton fabric obtained by using same | |
| CN105374537B (en) | Transformer case and preparation method thereof | |
| CN111572156A (en) | Take anti-flaming function's ripples of inhaling camouflage surface fabric | |
| CN106003921B (en) | High temperature resistant Compound Fabric and its production technology | |
| CN108084589A (en) | A kind of moisture-proof ageing-resistant CABLE MATERIALS and preparation method thereof | |
| CN106986962A (en) | A kind of lcd tv display radiation proof material and preparation method thereof | |
| CN108793934B (en) | Novel superconducting wave-absorbing composite material and preparation method thereof | |
| CN112140662A (en) | Breathable electromagnetic shielding heat insulation cloth and preparation process thereof | |
| CN105788797A (en) | Low-temperature high-permeability soft magnetic manganese-zinc ferrite material 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 | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190301 |