CN111540561A - High-temperature-resistant flexible bonding permanent magnet for permanent magnet travel limit switch and preparation method thereof - Google Patents
High-temperature-resistant flexible bonding permanent magnet for permanent magnet travel limit switch and preparation method thereof Download PDFInfo
- Publication number
- CN111540561A CN111540561A CN202010383995.XA CN202010383995A CN111540561A CN 111540561 A CN111540561 A CN 111540561A CN 202010383995 A CN202010383995 A CN 202010383995A CN 111540561 A CN111540561 A CN 111540561A
- Authority
- CN
- China
- Prior art keywords
- permanent magnet
- parts
- temperature
- limit switch
- weight
- 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
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000004014 plasticizer Substances 0.000 claims abstract description 33
- 229920001971 elastomer Polymers 0.000 claims abstract description 27
- 239000012760 heat stabilizer Substances 0.000 claims abstract description 20
- 239000000314 lubricant Substances 0.000 claims abstract description 20
- 238000003490 calendering Methods 0.000 claims abstract description 19
- 239000011230 binding agent Substances 0.000 claims abstract description 17
- 238000005520 cutting process Methods 0.000 claims abstract description 9
- 239000006247 magnetic powder Substances 0.000 claims abstract description 9
- 229910052712 strontium Inorganic materials 0.000 claims abstract description 9
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 9
- 230000005405 multipole Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 27
- 238000009826 distribution Methods 0.000 claims description 14
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 10
- 239000004709 Chlorinated polyethylene Substances 0.000 claims description 8
- 150000001860 citric acid derivatives Chemical class 0.000 claims description 8
- 239000004698 Polyethylene Substances 0.000 claims description 6
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 6
- 239000000806 elastomer Substances 0.000 claims description 6
- 125000000816 ethylene group Chemical group [H]C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 6
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 6
- 239000000194 fatty acid Substances 0.000 claims description 6
- 239000000395 magnesium oxide Substances 0.000 claims description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 6
- -1 polyethylene Polymers 0.000 claims description 6
- 229920000573 polyethylene Polymers 0.000 claims description 6
- 235000012424 soybean oil Nutrition 0.000 claims description 6
- 239000003549 soybean oil Substances 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 6
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- IHBCFWWEZXPPLG-UHFFFAOYSA-N [Ca].[Zn] Chemical compound [Ca].[Zn] IHBCFWWEZXPPLG-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims 1
- 230000005415 magnetization Effects 0.000 abstract description 9
- 230000035515 penetration Effects 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 235000014113 dietary fatty acids Nutrition 0.000 description 4
- 229930195729 fatty acid Natural products 0.000 description 4
- 150000004665 fatty acids Chemical class 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- MQIUGAXCHLFZKX-UHFFFAOYSA-N Di-n-octyl phthalate Natural products CCCCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCCC MQIUGAXCHLFZKX-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- BJQHLKABXJIVAM-UHFFFAOYSA-N bis(2-ethylhexyl) phthalate Chemical compound CCCCC(CC)COC(=O)C1=CC=CC=C1C(=O)OCC(CC)CCCC BJQHLKABXJIVAM-UHFFFAOYSA-N 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 239000011575 calcium Substances 0.000 description 2
- 230000002301 combined effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- XNGIFLGASWRNHJ-UHFFFAOYSA-L phthalate(2-) Chemical compound [O-]C(=O)C1=CC=CC=C1C([O-])=O XNGIFLGASWRNHJ-UHFFFAOYSA-L 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000013040 rubber vulcanization Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 239000012856 weighed raw material Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
- H01F1/0311—Compounds
- H01F1/0313—Oxidic compounds
- H01F1/0315—Ferrites
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/003—Methods and devices for magnetising permanent magnets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
The invention discloses a high-temperature-resistant flexible bonding permanent magnet for a permanent magnet travel limit switch and a preparation method thereof, wherein the magnet comprises the following components in parts by weight: 85-91 parts of permanent magnet strontium ferrite magnetic powder, 7-9 parts of rubber binder, 1-2 parts of plasticizer meeting ROHS2.0 standard, 0.5-2 parts of heat stabilizer and 0.5-2 parts of lubricant. The preparation method of the magnet comprises the following steps: mixing and plasticizing, calendering and cutting the components to obtain the magnetic stripe; and then carrying out permanent magnetic field penetration magnetization and pulse multipole saturation magnetization on the magnetic strip, thereby obtaining the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch. The invention not only meets the requirements of ROHS2.0 standard, but also improves the upper limit of the use temperature of the flexible bonding permanent magnet from 80 ℃ in the prior art to 120 ℃, widens the use field of the permanent magnet travel limit switch, and increases the stability and reliability of the permanent magnet travel limit switch.
Description
Technical Field
The invention relates to the field of permanent magnet travel limit switches, in particular to a high-temperature-resistant flexible bonded permanent magnet for a permanent magnet travel limit switch and a preparation method thereof.
Background
At present, most of limit switches commonly used in China are photoelectric switches and mechanical collision switches. The photoelectric switch uses the sheltering or reflection of the detected object to the light beam to gate the circuit by the synchronous loop, thereby detecting the existence of the object. The photoelectric switch converts the input current into an optical signal on the transmitter to be emitted, and the receiver detects the target object according to the intensity or the existence of the received light. However, the photoelectric switch has high cost and complicated photoelectric system, and the photoelectric signal is easily covered by dust between floors to be interfered, thereby possibly causing the problem of control failure. The mechanical collision switch is characterized in that a contact of the mechanical collision switch is operated to control the on-off of an external circuit by means of the motion collision of a mechanical part, so that a certain control purpose is achieved.
The permanent magnet travel limit switch consists of a static part magnetic switch and a moving part control magnet, and directly attracts a reed switch contact point by adopting a magnetic induction principle so as to realize on-off control of an external circuit. The permanent magnet travel limit switch has the advantages of reliable performance, convenient installation, sensitive action, long service life and the like, and completely overcomes the defects of poor contact, unreliability, easy damage and the like of a mechanical collision switch commonly used in China. But the formula and the process of the flexible bonded permanent magnet applied to the permanent magnet travel limit switch at present have limitations, firstly, phthalate plasticizers containing benzene ring structures are adopted, the requirements of ROHS2.0 standards are not met, the flexible bonded permanent magnet is harmful to human bodies and the environment, and the use temperature of the flexible bonded permanent magnet is lower than 80 ℃; and secondly, the traditional rubber vulcanization process is adopted for the flexible magnet with the use temperature of more than 80 ℃, the production efficiency and the yield are very low, the processing of the vulcanized rim charge is difficult, the rim charge cannot be added and utilized again, the product cost is high, and a vulcanization system is harmful to the environment. This limits the use environment of the permanent magnet limit switches.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch and the preparation method thereof, which not only meet the requirements of ROHS2.0 standard, but also can improve the upper limit of the service temperature of the flexible bonded permanent magnet from 80 ℃ to 120 ℃ in the prior art without adopting a vulcanization process, broaden the use field of the permanent magnet travel limit switch and increase the stability and reliability of the permanent magnet travel limit switch.
The purpose of the invention is realized by the following technical scheme:
a high-temperature-resistant flexible bonding permanent magnet for a permanent magnet travel limit switch comprises the following components in parts by weight: 85-91 parts of permanent magnet strontium ferrite magnetic powder, 7-9 parts of rubber binder, 1-2 parts of plasticizer meeting ROHS2.0 standard, 0.5-2 parts of heat stabilizer and 0.5-2 parts of lubricant.
Preferably, the plasticizer meeting the ROHS2.0 standard is prepared by mixing 30-50 parts by weight of epoxidized soybean oil and 50-70 parts by weight of modified citrate plasticizer which does not contain benzene ring structures and has a molecular weight of more than 500.
Preferably, the rubber adhesive is prepared by mixing 5-20 parts by weight of chlorinated polyethylene, 15-25 parts by weight of ethylene-vinyl acetate copolymer and 55-70 parts by weight of thermoplastic polyurethane elastomer.
Preferably, the heat stabilizer is prepared by mixing 30-60 parts by weight of calcium zinc stabilizer and 40-70 parts by weight of magnesium oxide.
Preferably, the lubricant is prepared by mixing 20-40 parts by weight of modified ethylene bis fatty acid amide and 60-80 parts by weight of polyethylene wax.
Preferably, the high-temperature resistant flexible bonding permanent magnet is a cuboid, the size range is 130mm multiplied by 15mm multiplied by 5mm to 400mm multiplied by 20mm multiplied by 8mm, and the use temperature range is-30 to +120 ℃.
Preferably, the high-temperature-resistant flexible bonding permanent magnet presents the polarity distribution of NSN or SNS in the length direction, and the surface magnetic field intensity of the center of the length of the magnetic strip is ≧ 300 GS.
A preparation method of a high-temperature-resistant flexible bonded permanent magnet for a permanent magnet travel limit switch comprises the following steps:
step 1, mixing and plasticizing treatment: preparing materials according to the using amount of each component of the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch, and then putting the materials into an internal mixer for full mixing and plasticizing, wherein the mixing temperature of the internal mixer is 140-150 ℃, so as to obtain an internal mixed material;
step 2, calendering treatment: calendering the banburying material on a calender, wherein the roll temperature of the calender is 140-150 ℃, so that a calendered plate-shaped material is obtained;
step 3, cutting treatment: cutting the plate-shaped material in length and width to obtain a magnetic stripe;
step 4, magnetizing treatment: the permanent magnetic field is conducted on the magnetic strip in the thickness direction to penetrate and magnetize, one surface of the magnetic strip is N-pole in polarity, the other surface of the magnetic strip is S-pole in polarity, then pulse multipole saturation magnetizing is conducted on the magnetic strip in the length direction according to the magnetic pole distribution condition of the needed magnetic strip, and therefore the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch is obtained.
According to the technical scheme provided by the invention, the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch provided by the invention adopts the special plasticizer without a benzene ring structure, so that the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch meets the latest ROHS2.0 standard certification; meanwhile, the rubber binder, the plasticizer, the heat stabilizer and the lubricant all adopt special formulas, the consumption of the rubber binder, the plasticizer, the heat stabilizer and the lubricant has a specific component proportion relation with the permanent magnet strontium ferrite magnetic powder, and the upper limit of the service temperature of the prepared flexible bonded permanent magnet can be increased to 120 ℃ from 80 ℃ in the prior art through the combined effect of the rubber binder, the plasticizer, the heat stabilizer and the lubricant, so that the use field of the permanent magnet travel limit switch is widened, and the stability and the reliability of the permanent magnet travel limit switch are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a distribution diagram of the pole widths of the high-temperature resistant flexible bonded permanent magnets for the permanent magnet travel limit switch in embodiment 1 of the present invention.
Fig. 2 is a distribution diagram of the pole widths of the high-temperature resistant flexible bonded permanent magnets for the permanent magnet travel limit switch in embodiment 2 of the present invention.
Fig. 3 is a distribution diagram of the pole widths of the high-temperature resistant flexible bonded permanent magnets for the permanent magnet travel limit switch in embodiment 3 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The high-temperature resistant flexible bonded permanent magnet for the permanent magnet travel limit switch and the preparation method thereof provided by the invention are described in detail below. Details not described in the present invention are well known to those skilled in the art.
A high-temperature-resistant flexible bonding permanent magnet for a permanent magnet travel limit switch comprises the following components in parts by weight: 85-91 parts of permanent magnet strontium ferrite magnetic powder, 7-9 parts of rubber binder, 1-2 parts of plasticizer meeting ROHS2.0 standard, 0.5-2 parts of heat stabilizer and 0.5-2 parts of lubricant.
Specifically, the high-temperature resistant flexible bonding permanent magnet for the permanent magnet travel limit switch can comprise the following embodiments:
(1) the rubber adhesive is prepared by mixing 5-20 parts by weight of chlorinated polyethylene, 15-25 parts by weight of ethylene-vinyl acetate copolymer and 55-70 parts by weight of thermoplastic polyurethane elastomer. The rubber adhesive with the distribution ratio improves the heat resistance of the prepared flexible bonded permanent magnet.
(2) The plasticizer meeting ROHS2.0 standard is prepared by mixing 30-50 parts by weight of epoxidized soybean oil and 50-70 parts by weight of modified citrate plasticizer which does not contain benzene ring structure and has molecular weight of more than 500. The plasticizer with the distribution ratio of the group meets the requirements of ROHS2.0 standard, and the modified citrate plasticizer has a molecular weight of more than 500 and is not easy to separate out of the magnet, so that the durability and the stability of the prepared flexible bonded permanent magnet are improved. In practical applications, the modified citrate plasticizer may be a WT108 type plasticizer manufactured by santong corporation limited.
(3) The heat stabilizer is prepared by mixing 30-60 parts by weight of calcium zinc stabilizer and 40-70 parts by weight of magnesium oxide. The heat stabilizer with the distribution ratio improves the heat resistance and the decomposition resistance of the rubber adhesive, thereby further improving the heat resistance of the prepared flexible bonded permanent magnet.
(4) The lubricant is prepared by mixing 20-40 parts by weight of modified ethylene bis-fatty acid amide and 60-80 parts by weight of polyethylene wax. The lubricant with the proportion improves the rolling processing characteristic at high temperature, so that the material is not stuck to a roller at high temperature and is easy to operate.
(5) The high-temperature resistant flexible bonding permanent magnet for the permanent magnet travel limit switch is a cuboid, the size range is 130mm multiplied by 15mm multiplied by 5 mm-400 mm multiplied by 20mm multiplied by 8mm, and the use temperature range is-30 to +120 ℃. The high-temperature resistant flexible bonding permanent magnet preferably has the polarity distribution of NSN or SNS in the length direction, and the surface magnetic field intensity of the center of the length of the magnet is ≧ 300 GS.
Further, the preparation method of the high-temperature resistant flexible bonding permanent magnet for the permanent magnet travel limit switch provided by the invention comprises the following steps:
step 1, mixing and plasticizing treatment: weighing the raw materials according to the using amount of each component of the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch, then heating the internal mixer to 140 ℃, putting the weighed raw materials into the internal mixer for full mixing and plasticizing, wherein the mixing temperature of the internal mixer is 140-150 ℃, and the mixing time is 30-40 minutes, so that the internal mixed material is obtained.
Step 2, calendering treatment: and (3) heating the roll of the calender to 140 ℃, and then calendering the banburying material on the calender, wherein the roll temperature of the calender is 140-150 ℃, so as to obtain the material which is calendered to be in a plate shape and has a proper thickness.
Step 3, cutting treatment: the plate-shaped material was left at room temperature for 12 hours and then cut in length and width to obtain a magnetic strip meeting the dimensional requirements.
Step 4, magnetizing treatment: and carrying out permanent magnetic field penetration and magnetization on the magnetic strip along the thickness direction to enable one surface of the magnetic strip to have an N-pole polarity and the other surface of the magnetic strip to have an S-pole polarity, and then carrying out pulse multipole saturation and magnetization on the magnetic strip along the length direction according to the requirement or not, thereby obtaining the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch.
In the prior art, CPE (chlorinated polyethylene) is used as a binder for the flexible bonding permanent magnet for the permanent magnet travel limit switch, DOP (dioctyl phthalate) containing a benzene ring structure is mostly used as a plasticizer, the latest ROHS2.0 standard is not met, and the use temperature of the flexible bonding permanent magnet is lower than 80 ℃, so that the use environment of the permanent magnet travel limit switch is limited. The high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch provided by the invention adopts the special plasticizer without a benzene ring structure, so that the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch meets the latest ROHS2.0 standard certification; meanwhile, the rubber binder, the plasticizer, the heat stabilizer and the lubricant all adopt special formulas, the consumption of the rubber binder, the plasticizer, the heat stabilizer and the lubricant has a specific component proportion relation with the permanent magnet strontium ferrite magnetic powder, and the upper limit of the service temperature of the prepared flexible bonded permanent magnet can be increased to 120 ℃ from 80 ℃ in the prior art through the combined effect of the rubber binder, the plasticizer, the heat stabilizer and the lubricant, so that the use field of the permanent magnet travel limit switch is widened, and the stability and the reliability of the permanent magnet travel limit switch are improved.
In conclusion, the embodiment of the invention not only meets the requirements of ROHS2.0 standard, but also improves the upper limit of the use temperature of the flexible bonded permanent magnet from 80 ℃ in the prior art to 120 ℃, widens the use field of the permanent magnet travel limit switch, and increases the stability and reliability of the permanent magnet travel limit switch.
In order to more clearly show the technical scheme and the technical effects provided by the present invention, the following describes in detail the high temperature resistant flexible bonded permanent magnet for a permanent magnet travel limit switch and the preparation method thereof provided by the embodiments of the present invention with specific embodiments.
Example 1
A high-temperature resistant flexible bonding permanent magnet for a permanent magnet travel limit switch is prepared by the following steps:
step 1, mixing and plasticizing treatment: putting 85 parts by weight of permanent magnet strontium ferrite magnetic powder, 9 parts by weight of rubber binder (the rubber binder is formed by mixing 5 parts by weight of chlorinated polyethylene, 25 parts by weight of ethylene-vinyl acetate copolymer and 70 parts by weight of thermoplastic polyurethane elastomer), 2 parts by weight of plasticizer according with ROHS2.0 standard (the plasticizer according with ROHS2.0 standard is formed by mixing 50 parts by weight of epoxy soybean oil and 50 parts by weight of modified citrate plasticizer which does not contain benzene ring structure and has molecular weight of more than 500), 2 parts by weight of heat stabilizer (the heat stabilizer is formed by mixing 60 parts by weight of calcium-zinc stabilizer and 40 parts by weight of magnesium oxide), 2 parts by weight of lubricant (the lubricant is formed by mixing 40 parts by weight of modified ethylene bis fatty acid amide and 60 parts by weight of polyethylene wax) into an internal mixer for fully mixing and plasticizing, wherein the mixing temperature of the internal mixer is 140-150 ℃, the mixing time is 40 minutes, thus obtaining the banburying material.
Step 2, calendering treatment: and (3) heating the roll of the calender to 140 ℃, and then calendering the banburying material on the calender, wherein the roll temperature of the calender is 140-150 ℃, so as to obtain the material which is calendered to be in a plate shape and has a proper thickness.
Step 3, cutting treatment: the plate-shaped material was left at room temperature for 12 hours and then cut in length and width to give a magnetic strip having dimensions of 270mm by 20mm by 5 mm.
Step 4, magnetizing treatment: the method comprises the steps of carrying out permanent magnetic field penetration magnetization on a magnetic strip along the thickness direction to enable the magnetic strip to have one surface with N-pole polarity and the other surface with S-pole polarity, then carrying out pulse multipole saturation magnetization on the magnetic strip along the length direction, wherein the magnetic strip center magnetic field is 330GS, and thus obtaining the high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch, wherein the pole width distribution of the high-temperature-resistant flexible bonded permanent magnet is as shown in figure 1(L1 is 9.5-10.5 mm, L2 is 249.5-250.5 mm, and L3 is 9.5-10.5 mm).
Example 2
A high-temperature resistant flexible bonding permanent magnet for a permanent magnet travel limit switch is prepared by the following steps:
step 1, mixing and plasticizing treatment: putting 91 parts by weight of permanent magnet strontium ferrite magnetic powder, 7 parts by weight of rubber binder (the rubber binder is formed by mixing 20 parts by weight of chlorinated polyethylene, 25 parts by weight of ethylene-vinyl acetate copolymer and 55 parts by weight of thermoplastic polyurethane elastomer), 1 part by weight of plasticizer according with ROHS2.0 standard (the plasticizer according with ROHS2.0 standard is formed by mixing 30 parts by weight of epoxy soybean oil and 70 parts by weight of modified citrate plasticizer which does not contain benzene ring structure and has molecular weight of more than 500), 0.5 part by weight of heat stabilizer (the heat stabilizer is formed by mixing 30 parts by weight of calcium stabilizer and 70 parts by weight of magnesium oxide), 0.5 part by weight of lubricant (the lubricant is formed by mixing 20 parts by weight of modified ethylene bis fatty acid amide and 80 parts by weight of polyethylene wax) into an internal mixer for fully mixing and plasticizing, wherein the mixing temperature of the internal mixer is 140-145 ℃, the mixing time is 30 minutes, thus obtaining the banburying material.
Step 2, calendering treatment: and (3) heating the roll of the calender to 140 ℃, and then calendering the banburying material on the calender, wherein the roll temperature of the calender is 140-145 ℃, so as to obtain the material in the shape of a plate which is calendered to be proper in thickness.
Step 3, cutting treatment: the plate-shaped material was left at room temperature for 12 hours, and then cut in length and width to give a magnetic strip having dimensions of 400mm × 20mm × 5 mm.
Step 4, magnetizing treatment: the method comprises the steps of carrying out permanent magnetic field penetration and magnetization on a magnetic strip along the thickness direction to enable the magnetic strip to have one surface with N-pole polarity and the other surface with S-pole polarity, then carrying out pulse multipole saturation and magnetization on the magnetic strip along the length direction, wherein the magnetic strip center magnetic field is 320GS, and thus obtaining the high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch with the pole width distribution as shown in figure 2(L1 is 9.5-10.5 mm, L2 is 399.5-400.5 mm, and L3 is 9.5-10.5 mm).
Example 3
A high-temperature resistant flexible bonding permanent magnet for a permanent magnet travel limit switch is prepared by the following steps:
step 1, mixing and plasticizing treatment: putting 90 parts by weight of permanent magnet strontium ferrite magnetic powder, 7 parts by weight of rubber binder (the rubber binder is formed by mixing 15 parts by weight of chlorinated polyethylene, 20 parts by weight of ethylene-vinyl acetate copolymer and 65 parts by weight of thermoplastic polyurethane elastomer), 2 parts by weight of plasticizer according with ROHS2.0 standard (the plasticizer according with ROHS2.0 standard is formed by mixing 40 parts by weight of epoxy soybean oil and 60 parts by weight of modified citrate plasticizer which does not contain benzene ring structure and has molecular weight of more than 500), 0.5 part by weight of heat stabilizer (the heat stabilizer is formed by mixing 45 parts by weight of calcium stabilizer and 55 parts by weight of magnesium oxide), 0.5 part by weight of lubricant (the lubricant is formed by mixing 30 parts by weight of modified ethylene bis fatty acid amide and 70 parts by weight of polyethylene wax) into an internal mixer for fully mixing and plasticizing, wherein the mixing temperature of the internal mixer is 140-150 ℃, the mixing time was 35 minutes, thereby obtaining an internal mixed material.
Step 2, calendering treatment: and (3) heating the roll of the calender to 140 ℃, and then calendering the banburying material on the calender, wherein the roll temperature of the calender is 140-150 ℃, so as to obtain the material which is calendered to be in a plate shape and has a proper thickness.
Step 3, cutting treatment: the plate-shaped material was left at room temperature for 12 hours, and then cut in length and width to give magnetic strips having dimensions of 130mm × 19mm × 8 mm.
Step 4, magnetizing treatment: and (3) carrying out permanent magnetic field penetration and magnetization on the magnetic strip along the thickness direction, so that the magnetic strip presents one surface with the polarity of N pole, the other surface with the polarity of S pole, and the central magnetic field of the magnetic strip is 310GS, thereby obtaining the high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch with the pole width distribution as shown in figure 3(L1 is 129.5-130.5 mm).
Performance detection
The flexible bonded permanent magnet for the permanent magnet travel limit switch in the prior art and the high-temperature resistant flexible bonded permanent magnet for the permanent magnet travel limit switch prepared in the embodiments 1 to 3 of the present invention were subjected to aging comparison detection, and the detection results are shown in the following table 1:
TABLE 1
| Categories | Aging conditions | Rate of change of volume | Watch field |
| Existing flexible bonded permanent magnet | 120℃×72h | Cracking of | - |
| Embodiment 1 of the present invention | 120℃×72h | 0.065％ | 330GS |
| Embodiment 2 of the present invention | 120℃×72h | 0.068％ | 320GS |
| Embodiment 3 of the present invention | 120℃×72h | 0.063％ | 310GS |
As can be seen from table 1 above: the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch prepared in the embodiments 1 to 3 of the invention has almost no change in volume at the ambient temperature of 120 ℃, while the flexible bonding permanent magnet strip for the permanent magnet travel limit switch in the prior art is cracked and cannot be used; this demonstrates that embodiments of the present invention increase the upper temperature limit of the flexible bonded permanent magnet usage from 80 c in the prior art to 120 c.
In conclusion, the embodiment of the invention not only meets the requirements of ROHS2.0 standard, but also improves the upper limit of the use temperature of the flexible bonded permanent magnet from 80 ℃ in the prior art to 120 ℃, widens the use field of the permanent magnet travel limit switch, and increases the stability and reliability of the permanent magnet travel limit switch.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. The high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch is characterized by comprising the following components in parts by weight: 85-91 parts of permanent magnet strontium ferrite magnetic powder, 7-9 parts of rubber binder, 1-2 parts of plasticizer meeting ROHS2.0 standard, 0.5-2 parts of heat stabilizer and 0.5-2 parts of lubricant.
2. The high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch according to claim 1, wherein the plasticizer meeting the ROHS2.0 standard is prepared by mixing 30-50 parts by weight of epoxidized soybean oil and 50-70 parts by weight of modified citrate plasticizer which does not contain a benzene ring structure and has a molecular weight of more than 500.
3. The high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch according to claim 1 or 2, wherein the rubber adhesive is prepared by mixing 5 to 20 parts by weight of chlorinated polyethylene, 15 to 25 parts by weight of ethylene-vinyl acetate copolymer and 55 to 70 parts by weight of thermoplastic polyurethane elastomer.
4. The high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch according to claim 1 or 2, wherein the heat stabilizer is formed by mixing 30-60 parts by weight of a calcium zinc stabilizer and 40-70 parts by weight of magnesium oxide.
5. The high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch according to claim 1 or 2, wherein the lubricant is prepared by mixing 20 to 40 parts by weight of modified ethylene bis-fatty acid amide and 60 to 80 parts by weight of polyethylene wax.
6. The high-temperature-resistant flexible bonded permanent magnet for the permanent magnet travel limit switch according to claim 1 or 2, wherein the high-temperature-resistant flexible bonded permanent magnet is a rectangular parallelepiped, has a size range of 130mm x 15mm x 5mm to 400mm x 20mm x 8mm, and has a use temperature range of-30 to +120 ℃.
7. The high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch according to claim 6, wherein the high-temperature-resistant flexible bonding permanent magnet presents a polarity distribution of NSN or SNS in a length direction, and the surface magnetic field intensity of a magnetic strip in the length center is not less than 300 GS.
8. A preparation method of a high-temperature-resistant flexible bonding permanent magnet for a permanent magnet travel limit switch is characterized by comprising the following steps:
step 1, mixing and plasticizing treatment: the permanent magnet travel limit switch according to any one of the preceding claims 1 to 7, wherein the components of the high-temperature resistant flexible bonded permanent magnet are mixed, and then the mixture is put into an internal mixer for full mixing and plasticizing, wherein the mixing temperature of the internal mixer is 140-150 ℃, so as to obtain an internal mixed material;
step 2, calendering treatment: calendering the banburying material on a calender, wherein the roll temperature of the calender is 140-150 ℃, so that a calendered plate-shaped material is obtained;
step 3, cutting treatment: cutting the plate-shaped material in length and width to obtain a magnetic stripe;
step 4, magnetizing treatment: the permanent magnetic field is conducted on the magnetic strip in the thickness direction to penetrate and magnetize, one surface of the magnetic strip is N-pole in polarity, the other surface of the magnetic strip is S-pole in polarity, then pulse multipole saturation magnetizing is conducted on the magnetic strip in the length direction according to the magnetic pole distribution condition of the needed magnetic strip, and therefore the high-temperature-resistant flexible bonding permanent magnet for the permanent magnet travel limit switch is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010383995.XA CN111540561A (en) | 2020-05-08 | 2020-05-08 | High-temperature-resistant flexible bonding permanent magnet for permanent magnet travel limit switch and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010383995.XA CN111540561A (en) | 2020-05-08 | 2020-05-08 | High-temperature-resistant flexible bonding permanent magnet for permanent magnet travel limit switch and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111540561A true CN111540561A (en) | 2020-08-14 |
Family
ID=71975478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010383995.XA Pending CN111540561A (en) | 2020-05-08 | 2020-05-08 | High-temperature-resistant flexible bonding permanent magnet for permanent magnet travel limit switch and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111540561A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331442A (en) * | 2020-09-28 | 2021-02-05 | 中国科学院宁波材料技术与工程研究所 | Magnetizing device, magnetizing apparatus, magnetizing method, and permanent magnet |
| CN115321972A (en) * | 2022-08-09 | 2022-11-11 | 矿冶科技集团有限公司 | Chromium removal method of bonded permanent magnetic ferrite and application thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010031264A1 (en) * | 2008-09-19 | 2010-03-25 | 广州金南磁塑有限公司 | Anisotropic flexible bonded ndfeb magnet and manufacturing method of the same |
| CN101800106A (en) * | 2010-04-07 | 2010-08-11 | 北京科技大学 | Preparation method of flexible anisotropy bonding rare earth permanent magnet material |
| CN102136332A (en) * | 2010-12-13 | 2011-07-27 | 北矿磁材科技股份有限公司 | Permanent magnet ferrite material for injection molding and manufacture method thereof |
| CN102360653A (en) * | 2011-06-08 | 2012-02-22 | 北矿磁材科技股份有限公司 | Flexible rare earth bonded magnet with roll anisotropy and manufacturing method thereof |
| CN108962522A (en) * | 2018-07-05 | 2018-12-07 | 北矿科技股份有限公司 | A kind of environmental protection flexible magnet injects soft pellet and preparation method thereof and utilizes its air device obtained environment protection permanent-magnet magnet ring |
-
2020
- 2020-05-08 CN CN202010383995.XA patent/CN111540561A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010031264A1 (en) * | 2008-09-19 | 2010-03-25 | 广州金南磁塑有限公司 | Anisotropic flexible bonded ndfeb magnet and manufacturing method of the same |
| CN101800106A (en) * | 2010-04-07 | 2010-08-11 | 北京科技大学 | Preparation method of flexible anisotropy bonding rare earth permanent magnet material |
| CN102136332A (en) * | 2010-12-13 | 2011-07-27 | 北矿磁材科技股份有限公司 | Permanent magnet ferrite material for injection molding and manufacture method thereof |
| CN102360653A (en) * | 2011-06-08 | 2012-02-22 | 北矿磁材科技股份有限公司 | Flexible rare earth bonded magnet with roll anisotropy and manufacturing method thereof |
| CN108962522A (en) * | 2018-07-05 | 2018-12-07 | 北矿科技股份有限公司 | A kind of environmental protection flexible magnet injects soft pellet and preparation method thereof and utilizes its air device obtained environment protection permanent-magnet magnet ring |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112331442A (en) * | 2020-09-28 | 2021-02-05 | 中国科学院宁波材料技术与工程研究所 | Magnetizing device, magnetizing apparatus, magnetizing method, and permanent magnet |
| CN112331442B (en) * | 2020-09-28 | 2023-02-28 | 中国科学院宁波材料技术与工程研究所 | Magnetizing device, magnetizing apparatus, magnetizing method, and permanent magnet |
| CN115321972A (en) * | 2022-08-09 | 2022-11-11 | 矿冶科技集团有限公司 | Chromium removal method of bonded permanent magnetic ferrite and application thereof |
| CN115321972B (en) * | 2022-08-09 | 2023-10-24 | 矿冶科技集团有限公司 | Chromium removal method and application of bonded permanent magnetic ferrite |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111540561A (en) | High-temperature-resistant flexible bonding permanent magnet for permanent magnet travel limit switch and preparation method thereof | |
| CN101859621B (en) | MnZn ferrite material with high magnetic conductivity and manufacturing method thereof | |
| CN101511751B (en) | Radio wave absorption material and radio wave absorber | |
| WO2020125584A1 (en) | Multi-step switch, and electronic apparatus | |
| CN106279914A (en) | A kind of modified poly ethylene power cable protecting pipe | |
| CN103289240B (en) | A kind of production method of Antistatic PVC sole | |
| CN108962522A (en) | A kind of environmental protection flexible magnet injects soft pellet and preparation method thereof and utilizes its air device obtained environment protection permanent-magnet magnet ring | |
| CN103214751B (en) | PVC/agricultural waste composite material, and preparation method and application thereof | |
| CN218483087U (en) | Waterproof industrial system remote controller | |
| CN104465066A (en) | Preparation method for bonded permanent magnet | |
| CN108422645A (en) | A kind of mold sealing strip and its preparation process for refrigerator lining plastic uptake | |
| CN104927387A (en) | Improved magnetic plastic material | |
| CN107915920A (en) | A kind of high resistance flame-retardant flexible type wire-insulating material and its manufacture method | |
| CN112053823B (en) | High-elasticity anti-aging motor magnetic stripe and preparation method thereof | |
| CN103747310A (en) | Automatic muting remote controller and remote controller muting method based on mobile phone signal | |
| CN100563839C (en) | Magnetic separator with ferrite and rare-earth permanent magnet | |
| CN204424150U (en) | A kind of plateau type solid sealed pole of vacuum circuit breaker | |
| CN106316387A (en) | Novel PTC ceramic thermistor dielectric material and preparation method thereof | |
| CN103771849B (en) | High-performance soft magnet for high-frequency low-loss switching mode power supply transformer | |
| CN111667967A (en) | High-fluidity samarium-iron-nitrogen flexible bonded permanent magnet for injection molding and preparation method thereof | |
| CN220984928U (en) | Electric car charging port with reed pipe magnetic switch | |
| CN105988101B (en) | Positioning device and localization method between two equipment | |
| CN210741371U (en) | Hall current type position sensor and vehicle | |
| CN209038792U (en) | A kind of home lift Obstacle Detection Device | |
| CN207999034U (en) | The epoxy resin mortar ground of anti-static non-ignition and building |
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 |
Application publication date: 20200814 |
|
| RJ01 | Rejection of invention patent application after publication |