CN111647194A - Preparation method of low-density magnetic material - Google Patents
Preparation method of low-density magnetic material Download PDFInfo
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- CN111647194A CN111647194A CN202010606241.6A CN202010606241A CN111647194A CN 111647194 A CN111647194 A CN 111647194A CN 202010606241 A CN202010606241 A CN 202010606241A CN 111647194 A CN111647194 A CN 111647194A
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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
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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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
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/22—Expandable microspheres, e.g. Expancel®
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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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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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
- C08J2451/00—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2451/06—Characterised by the use of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
Abstract
The invention belongs to the technical field of magnetic materials, and particularly relates to a preparation method of a low-density magnetic material. Which comprises the following steps: 1) stirring 60-70 parts by weight of anisotropic strontium-iron magnetic powder with 0.1-0.3 part by weight of titanate coupling agent in a high-speed stirrer for modification to obtain a modified magnetic material; 2) adding 18-35 parts by weight of polyethylene resin, 1-2 parts by weight of montmorillonite, 0.5-1.5 parts by weight of polypropylene grafted maleic anhydride and 0.01-0.03 part by weight of microsphere foaming agent into the modified magnetic material in the step 1), and stirring at high speed to obtain composite magnetic powder; 3) mixing and extruding: mixing and extruding the composite magnetic powder at a first temperature by using a double-screw extruder to prepare magnetic master batches with the particle size of 2-5 mm; 4) injection molding: the magnetic master batch is molded and formed at the second temperature by an injection molding machine, and orientation is carried out in a magnetic field during forming.
Description
Technical Field
The invention belongs to the technical field of magnetic materials, and particularly relates to a preparation method of a low-density magnetic material.
Background
The magnetic material is a magnet prepared by mixing magnetic powder, a binder and a processing aid. Magnetic materials are widely usedFind widespread application in the household appliances, electric toys, printing equipment and the automotive industry. The density of the magnetic material prepared by the conventional process is generally 5g/cm3The above.
The microsphere foaming agent is a thermoplastic hollow polymer microsphere and consists of a thermoplastic polymer shell and liquid alkane gas sealed in the thermoplastic hollow polymer microsphere. The hollow spheres have an average diameter ranging from 10 to 50 μm and a true density of 1, 000 to 1, 300kg/m3. When heated, the gas pressure within the shell increases and the thermoplastic outer shell softens, causing a significant increase in expanded microsphere volume. When cooled, the expanded microsphere shell hardens again and the volume is fixed.
At present, no prior art for preparing low density magnetic materials by using microsphere foaming agents has been found.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a preparation method of a low-density magnetic material, which can solve the problem of high density of the magnetic material in the prior art.
The technical scheme adopted by the invention for solving the technical problem is to provide a preparation method of a low-density magnetic material, which comprises the following steps:
1) stirring 60-70 parts by weight of anisotropic strontium-iron magnetic powder with 0.1-0.3 part by weight of titanate coupling agent in a high-speed stirrer for modification to obtain a modified magnetic material;
2) adding 18-35 parts by weight of polyethylene resin, 1-2 parts by weight of montmorillonite, 0.5-1.5 parts by weight of polypropylene grafted maleic anhydride and 0.1-0.3 part by weight of microsphere foaming agent into the modified magnetic material in the step 1), and stirring at high speed to obtain composite magnetic powder;
3) mixing and extruding: mixing and extruding the composite magnetic powder at a first temperature by using a double-screw extruder to prepare magnetic master batches with the particle size of 2-5 mm;
4) injection molding: and (3) injection molding the magnetic master batch at a second temperature in an injection molding machine, and carrying out orientation in a magnetic field during molding.
In the invention, a trace amount of microsphere foaming agent is added as a foaming raw material of the magnetic material, the microsphere foaming agent is mixed with the modified magnetic material, the polyethylene resin can provide adhesive force, the anisotropic strontium-iron magnetic powder and other raw materials are bonded and molded, and the magnetic material obtained by injection molding is in a micro-foaming state, so that the density of the magnetic material can be effectively reduced.
Preferably, the initial particle size of the microsphere foaming agent is 20-40 μm.
Preferably, the initial foaming temperature of the microsphere foaming agent is 160-200 ℃.
In the invention, the microsphere foaming agent adopts Japanese Songben ultrahigh-temperature expanded microsphere foaming agent which is one of F-190D (initial particle size is 30-40 μm, initial foaming temperature is 160-.
Preferably, the first temperature is lower than the initial foaming temperature of the microsphere foaming agent and higher than the melting point of the polyethylene resin; and the second temperature is higher than the initial foaming temperature of the foaming agent.
Polyethylene is a thermoplastic resin prepared by polymerizing ethylene, is used as an adhesive for magnetic materials, and has the advantages of good low-temperature resistance, no toxicity, good stability and difficult moisture absorption. Preferably, the polyethylene resin is high density polyethylene or low density polyethylene.
The high density polyethylene has better hardness, tensile strength and creep property than the low density polyethylene; preferably, the polyethylene resin is high density polyethylene, and the microsphere foaming agent is F-260D.
Preferably, the first temperature is 160-.
Combining the melting point of the adhesive polyethylene resin and the foaming temperature of the microsphere foaming agent, controlling the first temperature to be lower than the initial foaming temperature of the microsphere foaming agent and higher than the melting point of the polyethylene resin in the mixing and extruding step, and controlling the microsphere foaming agent not to foam and expand in the mixing and extruding process so that all raw materials for preparing the magnetic material can be uniformly mixed and smelted; in the injection molding step, the second temperature is controlled to be higher than the initial foaming temperature of the foaming agent, so that the microsphere foaming agent is foamed at high temperature, the volume of the injection molding magnetic material is expanded, and the low-density magnetic material is obtained.
Preferably, the titanate coupling agent is isopropyl tris (dioctyl pyrophosphate) titanate. The isopropyl tri (dioctyl pyrophosphate) titanate can be well used for surface modification of the anisotropic strontium iron magnetic powder, and the modified anisotropic strontium iron magnetic powder can be well compatible with polyethylene resin and other auxiliary materials.
Preferably, the montmorillonite is hyperbranched quaternary ammonium salt modified organic montmorillonite. The hyperbranched quaternary ammonium salt modified organic montmorillonite has good compatibility with polyethylene resin and a microsphere foaming agent.
Preferably, the speed of the high-speed stirring in the step 2) is 1000-1200r/min, and the time is 15-30 min.
Compared with the prior art, the invention has the beneficial effects that: combining the melting point of the adhesive polyethylene resin and the foaming temperature of the microsphere foaming agent, controlling the first temperature to be lower than the initial foaming temperature of the microsphere foaming agent and higher than the melting point of the polyethylene resin in the mixing and extruding step, so that the microsphere foaming agent can be controlled not to foam and expand in the mixing and extruding process, and all raw materials of the magnetic material can be uniformly mixed and melted; in the injection molding step, the second temperature is controlled to be higher than the initial foaming temperature of the foaming agent, so that the microsphere foaming agent is foamed at high temperature, the volume of the injection molding magnetic material is expanded, and the low-density magnetic material is obtained.
Detailed Description
The experimental procedures in the following examples are conventional unless otherwise specified. The raw materials in the following examples are all commercially available products and are commercially available, unless otherwise specified. The present invention is described in further detail below with reference to examples:
example 1
1) Taking 65 parts by weight of anisotropic strontium iron magnetic powder, and stirring 0.2 part by weight of isopropyl tri (dioctyl pyrophosphate) titanate for 45min at the rotating speed of 800r/min by a high-speed stirrer to obtain a modified magnetic material;
2) adding 28 parts by weight of high-density polyethylene resin, 1.5 parts by weight of hyperbranched quaternary ammonium salt modified organic montmorillonite, 1 part by weight of polypropylene grafted maleic anhydride and 0.02 part by weight of F-260D microsphere foaming agent into the modified magnetic material in the step 1), and stirring for 20min at 1100r/min to obtain composite magnetic powder;
3) mixing and extruding: mixing and extruding the composite magnetic powder at the temperature of 160-180 ℃ by using a double-screw extruder to prepare magnetic master batch with the particle size of 2-5 mm;
4) injection molding: molding the magnetic master batch at the temperature of 240-260 ℃ in an injection molding machine, and orienting in a magnetic field during molding to obtain the magnetic material with the density of 2.36g/cm3。
Example 2
1) Taking 70 parts by weight of anisotropic strontium-iron magnetic powder, and stirring 0.1 part by weight of isopropyl tri (dioctyl pyrophosphate) titanate for 30min at the rotating speed of 1000r/min by a high-speed stirrer to obtain a modified magnetic material;
2) adding 18 parts by weight of high-density polyethylene resin, 2 parts by weight of hyperbranched quaternary ammonium salt modified organic montmorillonite, 1.5 parts by weight of polypropylene grafted maleic anhydride and 0.03 part by weight of F-260D microsphere foaming agent into the modified magnetic material in the step 1), and stirring for 15min at 1000r/min to obtain composite magnetic powder;
3) mixing and extruding: mixing and extruding the composite magnetic powder at the temperature of 160-180 ℃ by using a double-screw extruder to prepare magnetic master batch with the particle size of 2-5 mm;
4) injection molding: molding the magnetic master batch at the temperature of 240-260 ℃ in an injection molding machine, and orienting in a magnetic field during molding to obtain the magnetic material with the density of 2.86g/cm3。
Example 3
1) 60 parts by weight of anisotropic strontium iron magnetic powder is taken, 0.3 part by weight of isopropyl tri (dioctyl pyrophosphate) titanate is stirred for 30min at the rotating speed of 1000r/min by a high-speed stirrer, and the modified magnetic material is obtained;
2) adding 35 parts by weight of high-density polyethylene resin, 2 parts by weight of hyperbranched quaternary ammonium salt modified organic montmorillonite, 0.5 part by weight of polypropylene grafted maleic anhydride and 0.02 part by weight of F-260D microsphere foaming agent into the modified magnetic material in the step 1), and stirring for 15min at 1000r/min to obtain composite magnetic powder;
3) mixing and extruding: mixing and extruding the composite magnetic powder at the temperature of 160-180 ℃ by using a double-screw extruder to prepare magnetic master batch with the particle size of 2-5 mm;
4) injection molding: molding the magnetic master batch at the temperature of 240-260 ℃ in an injection molding machine, and orienting in a magnetic field during molding to obtain the magnetic material with the density of 2.03g/cm3。
Example 4
1) 60 parts by weight of anisotropic strontium iron magnetic powder is taken, 0.2 part by weight of isopropyl tri (dioctyl pyrophosphate) titanate is stirred for 30min at the rotating speed of 1000r/min by a high-speed stirrer, and the modified magnetic material is obtained;
2) adding 30 parts by weight of high-density polyethylene resin, 1 part by weight of hyperbranched quaternary ammonium salt modified organic montmorillonite, 1.5 parts by weight of polypropylene grafted maleic anhydride and 0.01 part by weight of F-260D microsphere foaming agent into the modified magnetic material in the step 1), and stirring for 15min at 1000r/min to obtain composite magnetic powder;
3) mixing and extruding: mixing and extruding the composite magnetic powder at the temperature of 160-180 ℃ by using a double-screw extruder to prepare magnetic master batch with the particle size of 2-5 mm;
4) injection molding: molding the magnetic master batch at the temperature of 240-260 ℃ in an injection molding machine, and orienting in a magnetic field during molding to obtain the magnetic material with the density of 2.95g/cm3。
Claims (10)
1. A preparation method of a low-density magnetic material is characterized by comprising the following steps:
1) stirring 60-70 parts by weight of anisotropic strontium-iron magnetic powder with 0.1-0.3 part by weight of titanate coupling agent in a high-speed stirrer for modification to obtain a modified magnetic material;
2) adding 18-35 parts by weight of polyethylene resin, 1-2 parts by weight of montmorillonite, 0.5-1.5 parts by weight of polypropylene grafted maleic anhydride and 0.01-0.03 part by weight of microsphere foaming agent into the modified magnetic material in the step 1), and stirring at high speed to obtain composite magnetic powder;
3) mixing and extruding: mixing and extruding the composite magnetic powder at a first temperature by using a double-screw extruder to prepare magnetic master batches with the particle size of 2-5 mm;
4) injection molding: and (3) injection molding the magnetic master batch at a second temperature in an injection molding machine, and carrying out orientation in a magnetic field during molding.
2. The method of claim 1, wherein the initial particle size of the microsphere foaming agent is 20-40 μm.
3. The method as claimed in claim 1, wherein the initial foaming temperature of the microsphere foaming agent is 160-200 ℃.
4. The method of claim 1, wherein the polyethylene resin is high density polyethylene or low density polyethylene.
5. The method for preparing a low-density magnetic material as claimed in claim 1, wherein the first temperature is lower than the initial foaming temperature of the microsphere foaming agent and higher than the melting point of the polyethylene resin; and the second temperature is higher than the initial foaming temperature of the foaming agent.
6. The method of claim 1, wherein the polyethylene resin is high density polyethylene, and the microsphere foaming agent is F-260D.
7. The method as claimed in claim 6, wherein the first temperature is 160-180 ℃ and the second temperature is 240-260 ℃.
8. The method of claim 1, wherein the titanate coupling agent is isopropyl tris (dioctyl pyrophosphate) titanate.
9. The method of claim 1, wherein the montmorillonite is a hyperbranched quaternary ammonium salt modified organic montmorillonite.
10. The method for preparing a low-density magnetic material as claimed in claim 1, wherein the rotation speed of the twin-screw extruder is 10-25 rpm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010606241.6A CN111647194A (en) | 2020-06-29 | 2020-06-29 | Preparation method of low-density magnetic material |
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| CN202010606241.6A CN111647194A (en) | 2020-06-29 | 2020-06-29 | Preparation method of low-density magnetic material |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63216305A (en) * | 1987-03-05 | 1988-09-08 | Hitachi Metals Ltd | Cylindrical magneto-anisotropically bond magnet |
| CN103709509A (en) * | 2013-12-17 | 2014-04-09 | 浙江普利特新材料有限公司 | Expandable microsphere filling modified polypropylene composite material and preparation method thereof |
| CN106935351A (en) * | 2017-01-17 | 2017-07-07 | 江西伟普科技有限公司 | Nano modification injection molding adhesion magnetic material and preparation method thereof |
| CN107955223A (en) * | 2017-12-15 | 2018-04-24 | 广东站成研创科技有限公司 | The low-density foamed rubber integrally-forming shoe of the low-density foamed rubber of micromagnetism, micromagnetism and its manufacture method |
-
2020
- 2020-06-29 CN CN202010606241.6A patent/CN111647194A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63216305A (en) * | 1987-03-05 | 1988-09-08 | Hitachi Metals Ltd | Cylindrical magneto-anisotropically bond magnet |
| CN103709509A (en) * | 2013-12-17 | 2014-04-09 | 浙江普利特新材料有限公司 | Expandable microsphere filling modified polypropylene composite material and preparation method thereof |
| CN106935351A (en) * | 2017-01-17 | 2017-07-07 | 江西伟普科技有限公司 | Nano modification injection molding adhesion magnetic material and preparation method thereof |
| CN107955223A (en) * | 2017-12-15 | 2018-04-24 | 广东站成研创科技有限公司 | The low-density foamed rubber integrally-forming shoe of the low-density foamed rubber of micromagnetism, micromagnetism and its manufacture method |
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Application publication date: 20200911 |