AU2020103606A4 - Method for Synthesizing an Anisotropic Modulable Polyurethane-based Composite Damping Material - Google Patents
Method for Synthesizing an Anisotropic Modulable Polyurethane-based Composite Damping Material Download PDFInfo
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- AU2020103606A4 AU2020103606A4 AU2020103606A AU2020103606A AU2020103606A4 AU 2020103606 A4 AU2020103606 A4 AU 2020103606A4 AU 2020103606 A AU2020103606 A AU 2020103606A AU 2020103606 A AU2020103606 A AU 2020103606A AU 2020103606 A4 AU2020103606 A4 AU 2020103606A4
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- polyurethane
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- modulable
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- 238000013016 damping Methods 0.000 title claims abstract description 46
- 239000000463 material Substances 0.000 title claims abstract description 46
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 40
- 239000004814 polyurethane Substances 0.000 title claims abstract description 39
- 239000002131 composite material Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title abstract description 6
- 230000002194 synthesizing effect Effects 0.000 title description 5
- 239000006249 magnetic particle Substances 0.000 claims abstract description 21
- 238000002360 preparation method Methods 0.000 claims abstract description 18
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 10
- 239000011159 matrix material Substances 0.000 claims abstract description 10
- 239000004971 Cross linker Substances 0.000 claims abstract 2
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims description 18
- 239000000843 powder Substances 0.000 claims description 16
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 claims description 11
- 229920001451 polypropylene glycol Polymers 0.000 claims description 9
- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 7
- 150000002009 diols Chemical class 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 4
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000004146 energy storage Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 3
- 239000006096 absorbing agent Substances 0.000 abstract description 2
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 239000000725 suspension Substances 0.000 abstract description 2
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical compound OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 description 6
- 229920001971 elastomer Polymers 0.000 description 5
- 239000007788 liquid Substances 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 description 3
- 239000000806 elastomer Substances 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- ZJCCRDAZUWHFQH-UHFFFAOYSA-N Trimethylolpropane Chemical compound CCC(CO)(CO)CO ZJCCRDAZUWHFQH-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000004359 castor oil Substances 0.000 description 1
- 235000019438 castor oil Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 125000005442 diisocyanate group Chemical group 0.000 description 1
- 238000005183 dynamical system Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/3605—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by their material
- F16F1/361—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers characterised by their material comprising magneto-rheological elastomers [MR]
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
-
- 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
-
- 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
- C08L75/08—Polyurethanes from polyethers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F1/00—Springs
- F16F1/36—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers
- F16F1/3615—Springs made of rubber or other material having high internal friction, e.g. thermoplastic elastomers with means for modifying the spring characteristic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/0838—Manufacture of polymers in the presence of non-reactive compounds
- C08G18/0842—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents
- C08G18/0847—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers
- C08G18/0852—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers the solvents being organic
- C08G18/0857—Manufacture of polymers in the presence of non-reactive compounds in the presence of liquid diluents in the presence of solvents for the polymers the solvents being organic the solvent being a polyol
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2350/00—Acoustic or vibration damping material
-
- 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
- C08K2201/00—Specific properties of additives
- C08K2201/01—Magnetic additives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F2224/00—Materials; Material properties
- F16F2224/02—Materials; Material properties solids
- F16F2224/0283—Materials; Material properties solids piezoelectric; electro- or magnetostrictive
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides an anisotropic modulable polyurethane-based composite damping
material and the preparation method thereof. The material is synthesized with polyurethane
matrix, magnetic particles, crosslinkers under a 40-60 mT magnetic field. The magnetic
particles are aligned during the curing process. The magnetic content is 20-100% of the mass
of the polyurethane matrix. The molar ratio of -NCO in the polyurethane matrix to -OH of the
crosslinking agent is 1:1.2. In the compression state, the damping material used in the invention
has high loss factor, large energy storage modulus and huge modulus variation with magnetic
field intensity. Under the influence of 0-400 mT, the energy storage modulus of the material
increases from 2.2 MPa to 3.26 MPa at 1 Hz. The preparation process is simple and the damping
performance is good. The viscoelastic properties under the magnetic field can be changed
greatly. It can be used in the design of various controllable stiffness or damping devices, such
as suspension system, shaft liner, vibration absorber.
-um-4mT
9 30MMT
550MO -0 A2UwrnT
5&tNDO *----OmT
OMT
4500000
VV
300000O
3000000
25ow0000
2000D000
T (OC)
Figure 1
0.62
0.60
0.58
~0.56
0.-4
0.52
0.50
0 5 10 is0;
HZ
Figure 2
Description
-um-4mT 9 30MMT 550MO -0 A2UwrnT 5&tNDO *----OmT OMT
4500000
300000O
3000000
25ow0000
2000D000
Figure 1
0.62
0.60
0.58
~0.56 0.-4
0.52
0.50
0 5 10 is0; HZ
Figure 2
Method for Synthesizing an Anisotropic Modulable Polyurethane-based Composite Damping Material
The invention relates to a damping material, and the preparation method of the damping material. Specifically, the invention relates to an modulable polyurethane-based composite damping material and the preparation method.
Mechanical vibration exists widely in the dynamical system. Vibration and noise are inevitable phenomena in production and life. For example, excessive vibration of the hull when the ship is sailing can cause fatigue damage to the hull structure, and affect the normal operation of the instruments and equipment on the ship, by reducing their accuracy in use and shortening their service life. At present, the commonly used vibration-reducing equipment is mainly elastic vibration-reducing elements, such as spring, rubber pad. These vibration-reducing elements suppress the vibration of the structure through the energy dissipation of spring or rubber in the course of movement. This kind of damping equipment has the advantages of simple structure, easy realization, economic and reliability, but because its structural parameters are optimally set in a specific environment, and the parameters cannot be changed once set, so that they lack flexibility in control. Therefore, the damping material with adjustable stiffness and modulus can effectively solve this problem.
Magnetorheological fluids have high magneto-rheological effects, but disadvantages are easy sedimentation problem and magnetic particle wear and tear due to long-term use. At present, there is no damping material which can adjust the modulus well in the reports on magnetorheological elastomers. The patent document with publication number CN101740192A disclosed a method for preparing a thermoplastic magnetorheological elastomer. The modulus of the elastomer was increased to 80-250%, but the thermoplastic styrene-ethylene-butadiene-styrene copolymer is chosen as the matrix. The anisotropic modulus of the material is immutable, lacking flexibility in practical application.
One of the main purposes of the present invention is to provide an anisotropic modulable polyurethane-based composite damping material with orientation and high damping properties; the second main purpose of the present invention is to provide a preparation method of the anisotropic modulable polyurethane-based composite damping material with a simple process.
The anisotropic modulable polyurethane-based composite damping material of the invention adopts the technical scheme: it is formed by curing a polyurethane matrix, magnetic particles and a crosslinking agent under a magnetic field.
The features of anisotropic modulable polyurethane-based composite damping material of the invention may further include:
1. The content of magnetic particles is 20-100% of the mass of polyurethane matrix.
2. The molar ratio of-NCO in polyurethane prepolymer to-OH in the crosslinking agent is 1:0.95-1.2.
3. The magnetic particles are carbonyl iron powders or carbonyl nickel powders, or a mixture of carbonyl iron powders and carbonyl nickel powders.
The technical scheme of the preparation method for the anisotropic modulable polyurethane based composite damping material is:
1) The main chain polyurethane prepolymer was prepared by vacuum heating of diol, then adding toluene diisocyanate (TDI), stirring evenly and slowly heating up to 75-85 °C, reacting for 2.5-3 h, and cooling to room temperature.
2) The polyurethane prepolymer, magnetic particles and crosslinking agent are mixed uniformly, and cured at 85°C-90°C in a magnetic field using a mold to obtain the anisotropic modulable polyurethane-based composite damping material.
The features of the preparation method of the anisotropic modulable polyurethane-based composite damping material may also include:
1. The magnetic particles are carbonyl iron powders or carbonyl nickel powders modified with silane coupling agent, or a mixture of carbonyl iron powders and carbonyl nickel powders. The magnetic particle content is 20-100% of polyurethane prepolymer mass.
2. The molar ratio of-NCO in polyurethane prepolymer to -OH in the crosslinking agent is 1: 0.95-1.2, preferably 1: 1.2.
3. The diols are polypropylene oxide (PPG) or polytetramethylene ether glycol (PTMG).
4. The magnetic field intensity is 40-60 mT.
5. The crosslinking agent is one or more of three hydroxymethylpropane (TMP), 1, 4 butanediol, propylene glycol or castor oil.
The grafted polyurethane prepolymer is prepared by vacuum heating of diol to remove water and air bubbles, and then fully reacting with diisocyanate at 75-85 °C. The prepared prepolymer NCO% content is 2%-7%. Then, the polyurethane matrix, magnetic particles and cross-linking agent are cured in a magnetic field to produce an anisotropic modulus variable polyurethane-based composite damping material.
The invention has the advantages of providing a composite damping material with orientation, high damping property, adjustable modulus and polyurethane as matrix in the material. Through the mold, the magnetic particles in the material are arranged in chains during the curing process under the magnetic field of 40-60mT. This chain arrangement can make the material have high energy storage modulus in compression mode and the change of modulus can reach 150%. The damping material has a high loss factor (tan 6), reaching more than 0.3 in a wide frequency range at room temperature, and has a high storage modulus when compressed, and a large magnetorheological effect. The preparation process is simple, the price is low, and the damping performance is good.. Under the influence of 0-400 mT, the energy storage modulus of the material increases from 2.2 MPa to 3.26 MPa at 1 Hz. The viscoelastic properties under the action of magnetic field can be changed greatly, which can be used in the design of various controllable stiffness or damping devices, such as suspension system, shaft liner, shock absorber.
Figure 1 shows the frequency curves of the energy storage modulus of the prepared damping material at room temperature versus frequency in different field strengths.
Figure 2 shows the loss versus frequency curve of the prepared damping material at room temperature.
For a better understanding of the present invention, the following examples are used for description.
EMBODIMENT 1:
1) Add 259.92 g of polyoxypropylene glycol (PPG) into a three-necked flask equipped with a
vacuum device, keep it under vacuum at 110 °C for 1.5-2 hours to remove the water in the
polyoxypropylene glycol. Stop pumping vacuum and lower the temperature to 45~55°C, then add
80.57 g of toluene diisocyanate (TDI), slowly raise the temperature to 80 °C and keep reacting for 3 h to reach a light yellow transparent viscous liquid, and leave it at room temperature for 12 h for later use.
2) Preparation of the anisotropic modulable polyurethane-based composite damping material: Accurately weigh 30 g polyurethane prepolymer at one time, fully mix 30 g magnetic particles, remove air bubbles and moisture in vacuum drying box at 85 °C. Then add 1.93 g preheated 1, 4 butanediol, stir formly, to remove the bubbles, cure at 85°C in a 40-60 mT magnetic field to obtain the anisotropic modulable polyurethane-based composite damping material.
EMBODIMENT 2
1) Synthesizing polyurethane prepolymer: Add 259.92 g of polyoxypropylene glycol (PPG)
into a three-necked flask equipped with a vacuum device, keep it under vacuum at 110 °C for 1.5~
2 h to remove the water in the polyoxypropylene glycol, then stop pumping vacuum and lower the
temperature to 45- 55 °C, then add 80.57 g of toluene diisocyanate (TDI), slowly raise the
temperature to 80 °C and react for 3 h to reach a light yellow transparent viscous liquid, and leave it at room temperature for 12 h for later use.
2) Preparation of anisotropic modulable polyurethane-based composite damping materials: Accurately weigh 30 g polyurethane prepolymer and 15 g magnetic particles at one time, mix them thoroughly, and remove bubbles and moisture in a vacuum drying oven at 85 °C. Then add 1.92 g of melted trimethylolpropane, stir evenly to remove the bubbles, and cure at 85 °C in a 40-60 mT magnetic field to obtain the anisotropic modulable polyurethane-based composite damping material.
EMBODIMENT 3
1) Synthesizing polyurethane prepolymer: Add 339.8 g polytetramethylene ether glycol (PTMG) into three flask with a vacuum device, vacuum at 110 °C for 1.5-2 h to remove water from polytetramethylene ether glycol, then stop vacuuming and cool down to 45-55 °C, add 80.57 g toluene diisocyanate (TDI), slowly heat up to 80 °C and keep reacting for 3h to reach a light yellow transparent viscous liquid, and leave it at room temperature for 12 h.
2) Preparation of anisotropic modulable polyurethane-based composite damping materials: Accurately weighing 30 g polyurethane prepolymer and 6 g magnetic particles at one time, mixing well and evenly, removing air bubbles and moisture in vacuum drying box at 85 °C. Then, 1.15 g of preheated 1, 4-butanediol was added and stirred evenly. The anisotropic modulable polyurethane based composite damping material was cured at 85 °C in a 40-60 mT magnetic field.
EMBODIMENT 4
1) Synthesizing polyurethane prepolymer: Put 215.7 g of polytetramethylene ether glycol (PTMG) into a three-necked flask equipped with a vacuum device, and keep the vacuum at 110 °C for 1.5~2 h to remove the polytetramethylene ether glycol. Then stop vacuuming and lower the
temperature to 45-55 °C, then add 80.57 g toluene diisocyanate (TDI), slowly warm up to 80 °C and keep reacting for 3 h to reach a light yellow transparent viscous liquid, and leave it at room temperature for 12 h for later use
.2) Preparation of anisotropic modulable polyurethane-based composite damping materials: Accurately weigh 30 g polyurethane prepolymer and 22.5 g magnetic particles at one time, mix them thoroughly, and remove bubbles and moisture in a vacuum drying oven at 85 °C. Then, 2.68 g of melted trimethylolpropane was added, stirred evenly, and the bubbles were removed and cured at °C in a 40-60 mT magnetic field to obtain the anisotropic modulable polyurethane-based composite damping material.
Claims (9)
1. An anisotropic modulable polyurethane-based composite damping material, synthesized with polyurethane matrix, magnetic particles, crosslinkers under a magnetic field.
2. The anisotropic modulable polyurethane-based composite damping material according to claim 1, wherein the content of magnetic particles is 20-100% of the mass of the polyurethane matrix; the molar ratio of -NCO in the polyurethane prepolymer and -OH in the crosslinking agent of is 1:0.95-1.2.
3. The anisotropic modulable polyurethane-based composite damping material according to claims 1 or 2, wherein the magnetic particles are carbonyl iron powders or carbonyl nickel powders, or a mixture of carbonyl iron powders and carbonyl nickel powders.
4. The preparation method of the anisotropic modulable polyurethane-based composite damping material, which characterized by:
1) Heat the diol in vacuum, then add toluene diisocyanate, stir evenly, raise the temperature to a reaction temperature of 75-85°C, keep reacting for 2.5-3 h, and cool to room temperature to obtain the main chain polyurethane prepolymer;
2) The polyurethane prepolymer, magnetic particles and crosslinking agent are mixed uniformly, and cured in a magnetic field using a mold at 85°C-90°C to obtain an anisotropic modulable polyurethane-based composite damping material.
5. The preparation method of the anisotropic modulable polyurethane-based composite damping material according to claim 4, wherein the magnetic particles are carbonyl iron powders or carbonyl nickel powders modified with a silane coupling agents, or a mixture of carbonyl iron powders and carbonyl nickel powders, and the content of magnetic particles is 20-100% of the mass of the polyurethane prepolymer.
6. The preparation method of the anisotropic modulable polyurethane-based composite damping material according to claim 5, wherein the molar ratio of -NCO in the polyurethane prepolymer to -OH in the crosslinking agent is 1:0.95-1.2.
7. The preparation method of the anisotropic modulable polyurethane-based composite damping material according to claims 4, 5 or 6, wherein the diol is polyoxypropylene glycol or polytetramethylene ether glycol.
8. The preparation method of the anisotropic modulable polyurethane-based composite damping material according to claims 4, 5 or 6, wherein the magnetic field strength is 40-60 mT.
9. The preparation method of the anisotropic modulus variable polyurethane-based composite damping material according to claim 7, wherein the magnetic field strength is 40-60 mT.
-1/1- 23 Nov 2020 2020103606
Figure 1
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Cited By (1)
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|---|---|---|---|---|
| CN115899155A (en) * | 2022-10-31 | 2023-04-04 | 南京航空航天大学 | Composite vibration reduction system and method for airborne equipment on helicopter |
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| CN115899155A (en) * | 2022-10-31 | 2023-04-04 | 南京航空航天大学 | Composite vibration reduction system and method for airborne equipment on helicopter |
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