CN104788938A - High-damping and high-strength magneto-rheological elastomer and preparation method thereof - Google Patents
High-damping and high-strength magneto-rheological elastomer and preparation method thereof Download PDFInfo
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- CN104788938A CN104788938A CN201510172027.3A CN201510172027A CN104788938A CN 104788938 A CN104788938 A CN 104788938A CN 201510172027 A CN201510172027 A CN 201510172027A CN 104788938 A CN104788938 A CN 104788938A
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Abstract
The invention belongs to the technical field of intelligent materials capable of vibration attenuation and sound absorption, particularly relates to a high-damping magneto-rheological elastomer and a preparation method thereof, and aims to improve the damping characteristics and mechanical characteristics of the original polyurethane-based magneto-rheological elastomer and ensure a higher magneto-rheological effect through preparing epoxy resin/polyurethane interpenetrating network substrate on the basis of the polyurethane-based magneto-rheological elastomer. The high-damping magneto-rheological elastomer comprises the following raw materials in weight percentage: 5-10% of epoxy resin, 10-20% of polyurethane prepolymer, 60-70% of carbonyl iron powder, 4.5-10% of a plasticizer and 0.5-1% of a curing agent. The high-damping magneto-rheological elastomer has high damping and high mechanical strength as well as the application requirements of a higher magneto-rheological effect, and can be applicable to the fields of vibration attenuation, sound absorption and intelligent damping.
Description
Technical field
The invention belongs to the intelligent material technical field being applied to vibration damping sound absorption, specifically a kind of magnetic rheology elastic body having high damping and preparation method thereof.
Background technology
Magnetic rheology elastic body, as the important a member of magnetorheological materials, is a kind of novel magnetic control intelligent material.It is made up of polymeric matrix, magnetic-particle, additive.After externally-applied magnetic field, the performance such as modulus (rigidity), damping of magnetic rheology elastic body can obtain control reversible in real time, has broad application prospects in fields such as anti-vibration and shock, magnetic control sensing, vibration damping sound absorptions.Magnetic rheology elastic body has had both the advantage of magnetorheological materials and polymer elastomer simultaneously, which overcomes the shortcoming of magnetorheological fluid sedimentation poor stability, and the motion simultaneously limiting ferromagnetic particle due to polymeric matrix makes to control the advantage that response is fast, controllability is good.It has also possessed the good mechanical properties and damping capacity that polymer elastomer itself has.Magnetic rheology elastic body is as the study hotspot of magnetorheological materials in recent years, people do a lot of work in improvement magnetic rheology elastic body characteristic, such as choose suitable matrix, improve the consistency of particle and matrix, improved the character of magnetic rheology elastic body by interpolation enhanced granule and softening agent.
At present because the matrix of magnetic rheology elastic body generally selects the rubber polymers such as urethane, silicon rubber, natural rubber.These matrixes are when being used alone, there will be damping factor low, the feature that effective damping temperature is wide not and physical strength is inadequate, can not meet the vibration damping needs of high damping, wide effective damping temperature range and high mechanical strength when being applied to high damping material Application Areas.
Summary of the invention
The object of the invention is on the basis of polyurethane-base magnetic rheology elastic body, improving damping characteristic and the mechanical characteristics of former polyurethane-base magnetic rheology elastic body by preparing Epoxy/Polyurethane interpenetrating(polymer)networks matrix, ensure that higher magnetic rheology effect simultaneously.
The present invention is achieved by the following technical solutions:
High damping magnetic rheology elastic body of the present invention is prepared from by the composition of following weight proportioning: be prepared from by the raw material of following weight proportioning: epoxy resin 5%-10%, base polyurethane prepolymer for use as 10%-20%, carbonyl iron dust 60%-70%, softening agent 4.5%-10%, solidifying agent is 0.5%-1%; Described epoxy resin is selected from the one in bisphenol A type epoxy resin, brominated epoxy resin or novolac epoxy; Described base polyurethane prepolymer for use as is polyvalent alcohol and isocyanate reaction gained; Described polyvalent alcohol is polyester polyol or polyether glycol; Described isocyanic ester is selected from least one in 2,4-diphenylmethanediisocyanate, 4,4-diphenylmethanediisocyanates or 2,6-tolylene diisocyanate.
Preferably, the mass ratio of epoxy resin and base polyurethane prepolymer for use as is 1 ︰ 2.
Preferably, described raw material also comprises catalyzer or/and reinforcing particles.
Preferably, be prepared from by the raw material of following weight proportioning: mass ratio 10% shared by epoxy resin, base polyurethane prepolymer for use as 20%, carbonyl iron dust 63%, softening agent 5%, solidifying agent is 1%, catalyzer 1%.
Concrete, described epoxy resin is bisphenol A type epoxy resin.
Concrete, described polyvalent alcohol is Viscotrol C; Described isocyanic ester is 2,4-diphenylmethanediisocyanate and 4,4-diphenylmethanediisocyanate.
Concrete, described softening agent is phthalic ester, and solidifying agent is 3-dimethylaminomethylphenol, and catalyzer is stannous octoate, and reinforcing particles is carbon black or Graphite Powder 99.
Concrete, described softening agent is dibutyl phthalate.
Present invention also offers the preparation method of high damping magnetic rheology elastic body, comprise the steps:
Base polyurethane prepolymer for use as is obtained with polyvalent alcohol and isocyanic ester; Prepare raw material according to following ratio: epoxy resin 5%-10%, base polyurethane prepolymer for use as 10%-20%, carbonyl iron dust 60%-70%, softening agent 4.5%-10%, solidifying agent is 0.5%-1%; Carbonyl iron dust is joined in epoxy resin and fully stirs, by the dispersed mixture of formation and base polyurethane prepolymer for use as mix and blend, take out bubble under vacuum conditions after adding softening agent and solidifying agent, curing molding under 80 ~ 120 DEG C of conditions.
Preferably, prepared raw material is used after 2 hours in 80 DEG C of dryings.
In the present invention, the ratio of inierpeneirating network structure epoxy resin and urethane has a great impact material behavior.Remain within the scope of 60-70% at carbonyl iron dust content, namely while the magneto-rheological characteristic ensureing magnetic rheology elastic body, when the ratio obtaining epoxy and base polyurethane prepolymer for use as in matrix is by experiment 1:2, damping characteristic under 25 DEG C of environment of the magnetic rheology elastic body of gained and magnetic rheology effect optimum.
Beneficial effect of the present invention is: the epoxy/polyurethane interpenetrating(polymer)networks matrix that magnetic rheology elastic body of the present invention adopts is due to the existence of inierpeneirating network structure in matrix, the advantage of urethane and epoxy resin is organically combined togather, improve the intrinsic damp of matrix, widen effective damping temperature range simultaneously.Simultaneously due to the existence of two-phase laminated flow structure, and the energy consumption that ferromagnetic particle is produced when slippage under magnetic field that adds of reinforcing particles becomes large, and therefore the collectivity damping property of magnetic rheology elastic body is improved.Because mutually running through of inierpeneirating network structure molecular network tangles, the synergy between molecular chain network makes the resistance toheat of magnetic rheology elastic body and physical strength all increase.The magnetic rheology elastic body that the present invention prepares can meet the application requiring that high damping, high mechanical strength have both higher magnetic rheology effect simultaneously.Described magnetic rheology elastic body can be applied to vibration damping, sound absorption, intelligent damping field.Present invention process is simple, and finished material is easy to shaping, easy industrialization and commercialization.
Accompanying drawing explanation
Fig. 1 is the elastomeric preparation flow figure of Epoxy/Polyurethane interpenetrating(polymer)networks based magnetic rheologic of the present invention
Embodiment
Embodiment 1 prepares the Epoxy/Polyurethane interpenetrating(polymer)networks magnetic rheology elastic body related to
Raw material prepares: before all raw materials use, in vacuum drying oven, 80 DEG C of dryings dewater for 2 hours.
Preparation method is as following steps, and idiographic flow is shown in Fig. 1:
Step one, phthalic anhydride Diethylene Glycol multipolymer and 2,6-tolylene diisocyanate mix and blend polyreaction are generated base polyurethane prepolymer for use as;
Step 2, in mass ratio brominated epoxy resin 5%, base polyurethane prepolymer for use as 20%, carbonyl iron dust 65%, softening agent 7%, solidifying agent is 1%, reinforcing particles 2%, weighs each component starting material;
Step 3, carbonyl iron dust and reinforcing particles carbon black added in epoxy resin fully to stir and form uniform mixture;
Step 4, mixture mix and blend in made for step 2 base polyurethane prepolymer for use as and step 3 is formed inierpeneirating network structure, add plasticizer phthalic acid dibutylester and solidifying agent 3-dimethylaminomethylphenol vacuum exhaust bubble under 80 DEG C of conditions;
Step 5, mixture is poured in mould, shaping at 120 DEG C of condition deeply-curings, obtained Epoxy/Polyurethane interpenetrating(polymer)networks based magnetic rheologic elastomerics.
The dissipation factor of general polyurethane-base magnetic rheology elastic body lower than 0.3, and the present embodiment record its within the scope of 20 DEG C-90 DEG C, strain rate is 0.1%, frequency is record dissipation factor under 10Hz condition between for 0.5-0.9; The highest effective damping temperature brings up to 70 DEG C; Tensile strength reaches 4.7MPa simultaneously.Epoxy/Polyurethane inierpeneirating network structure is incorporated in the matrix of magnetic rheology elastic body, than the elastomeric advantage of conventional polyurethanes based magnetic rheologic for improve tensile modulus, dissipation factor and effective damping temperature range.
Embodiment 2 prepares the Epoxy/Polyurethane interpenetrating(polymer)networks magnetic rheology elastic body related to
Raw material prepares: before all raw materials use, in vacuum drying oven, 80 DEG C of dryings dewater for 2 hours.
Preparation method is as following steps, and idiographic flow is shown in Fig. 1:
Step one, the mixture (respectively accounting for 50%) of 2,4-diphenylmethanediisocyanate and 4,4-diphenylmethanediisocyanate and Viscotrol C mix and blend polyreaction are generated base polyurethane prepolymer for use as;
Step 2, in mass ratio bisphenol A type epoxy resin 10%, base polyurethane prepolymer for use as 20%, carbonyl iron dust 63%, softening agent 5%, solidifying agent is 1%, catalyzer 1%, weighs each component starting material;
Step 3, carbonyl iron dust added in epoxy resin fully to stir and form uniform mixture;
Step 4, mixture mix and blend in made for step 2 base polyurethane prepolymer for use as and step 3 is formed inierpeneirating network structure, add octoate catalyst sub-tin, plasticizer phthalic acid dibutylester and solidifying agent 3-dimethylaminomethylphenol vacuum exhaust bubble under 80 DEG C of conditions;
Step 5, mixture is poured in mould, deeply-curing under 100 DEG C of conditions, finally obtained Epoxy/Polyurethane interpenetrating(polymer)networks based magnetic rheologic elastomerics.
The dissipation factor of general polyurethane-base magnetic rheology elastic body is lower than 0.3, and the present embodiment records within the scope of 20 DEG C-90 DEG C, strain rate is 0.1%, frequency is record dissipation factor under 10Hz condition between for 0.5-0.9; The highest effective damping temperature brings up to 80 DEG C; Tensile strength reaches 7.2MPa simultaneously.Epoxy/Polyurethane inierpeneirating network structure is incorporated in the matrix of magnetic rheology elastic body, than the elastomeric advantage of conventional polyurethanes based magnetic rheologic for improve tensile modulus, dissipation factor and effective damping temperature range.
Embodiment 3 prepares the Epoxy/Polyurethane interpenetrating(polymer)networks magnetic rheology elastic body related to
Raw material prepares: before all raw materials use, in vacuum drying oven, 80 DEG C of dryings dewater for 2 hours.
Preparation method is as following steps, and idiographic flow is shown in Fig. 1:
Step one, the mixture (respectively accounting for 50%) of 2,4-diphenylmethanediisocyanate and 4,4-diphenylmethanediisocyanate and Viscotrol C mix and blend polyreaction are generated base polyurethane prepolymer for use as;
Step 2, in mass ratio novolac epoxy 8%, base polyurethane prepolymer for use as 16%, carbonyl iron dust 60%, softening agent 10%, solidifying agent is 1%, reinforcing particles 5%, weighs each component starting material;
Step 3, carbonyl iron dust and reinforcing particles graphite added in epoxy resin fully to stir and form uniform mixture;
Step 4, mixture mix and blend in made for step 2 base polyurethane prepolymer for use as and step 3 is formed inierpeneirating network structure, add plasticizer phthalic acid dibutylester and solidifying agent 3-dimethylaminomethylphenol vacuum exhaust bubble under 80 DEG C of conditions;
Step 5, pour in mould by mixture, under 120 DEG C of conditions, deeply-curing obtains Epoxy/Polyurethane interpenetrating(polymer)networks based magnetic rheologic elastomerics.
The dissipation factor of general polyurethane-base magnetic rheology elastic body is lower than 0.3, and the present embodiment records within the scope of 20 DEG C-90 DEG C, strain rate is 0.1%, frequency is record dissipation factor under 10Hz condition between for 0.4-0.8; The highest effective damping temperature brings up to 80 DEG C; Tensile strength reaches 8.9MPa simultaneously.Epoxy/Polyurethane inierpeneirating network structure is incorporated in the matrix of magnetic rheology elastic body, than the elastomeric advantage of conventional polyurethanes based magnetic rheologic for improve tensile modulus, dissipation factor and effective damping temperature range.
Comparative example 1
Raw material prepares: before all raw materials use, in vacuum drying oven, 80 DEG C of dryings dewater for 2 hours.
Preparation method is as following steps, and idiographic flow is shown in Fig. 1:
Step one, phthalic anhydride Diethylene Glycol multipolymer and 2,6-tolylene diisocyanate mix and blend polyreaction are generated base polyurethane prepolymer for use as;
Step 2, in mass ratio brominated epoxy resin 20%, base polyurethane prepolymer for use as 5%, carbonyl iron dust 70%, softening agent 3%, solidifying agent is 2%, weighs each component starting material;
Step 3, carbonyl iron dust added in epoxy resin fully to stir and form uniform mixture;
Step 4, mixture mix and blend in made for step 2 base polyurethane prepolymer for use as and step 3 is formed inierpeneirating network structure, add plasticizer phthalic acid dibutylester and solidifying agent 3-dimethylaminomethylphenol vacuum exhaust bubble under 80 DEG C of conditions;
Step 5, mixture is poured in mould, shaping at 120 DEG C of condition deeply-curings, obtained Epoxy/Polyurethane interpenetrating(polymer)networks based magnetic rheologic elastomerics.
This comparative example record its within the scope of 20 DEG C-90 DEG C, strain rate is 0.1%, frequency is record dissipation factor under 10Hz condition between for 0.25-0.3; Tensile strength reaches 14.8MPa.Content due to epoxy resin in comparative example is excessive, causes the intensity of matrix excessive, the mobile difficulty of iron powder under magnetic field, cause damping and magnetic rheology effect too low under magnetic field.
Comparative example 2
Raw material prepares: before all raw materials use, in vacuum drying oven, 80 DEG C of dryings dewater for 2 hours.
Preparation method is as following steps, and idiographic flow is shown in Fig. 1:
Step one, the mixture (respectively accounting for 50%) of 2,4-diphenylmethanediisocyanate and 4,4-diphenylmethanediisocyanate and Viscotrol C mix and blend polyreaction are generated base polyurethane prepolymer for use as;
Step 2, in mass ratio bisphenol A type epoxy resin 2%, base polyurethane prepolymer for use as 20%, carbonyl iron dust 70%, softening agent 6.8%, solidifying agent is 0.2%, catalyzer 1%, weighs each component starting material;
Step 3, carbonyl iron dust added in epoxy resin fully to stir and form uniform mixture;
Step 4, mixture mix and blend in made for step 2 base polyurethane prepolymer for use as and step 3 is formed inierpeneirating network structure, add octoate catalyst sub-tin, plasticizer phthalic acid dibutylester and solidifying agent 3-dimethylaminomethylphenol vacuum exhaust bubble under 80 DEG C of conditions;
Step 5, mixture is poured in mould, degree of depth sulfuration under 100 DEG C of conditions, finally obtained Epoxy/Polyurethane interpenetrating(polymer)networks based magnetic rheologic elastomerics.
This comparative example records within the scope of 20 DEG C-90 DEG C, strain rate is 0.1%, frequency is record dissipation factor under 10Hz condition between for 0.2-0.25; Tensile strength reaches 0.87MPa.Because epoxy resin proportioning is too low in comparative example, cause inierpeneirating network structure content too small, damping characteristic and tensile strength promote not obvious.
Comparative example 3
Raw material prepares: before all raw materials use, in vacuum drying oven, 80 DEG C of dryings dewater for 2 hours.
Preparation method is as following steps, and idiographic flow is shown in Fig. 1:
Step one, the mixture (respectively accounting for 50%) of 2,4-diphenylmethanediisocyanate and 4,4-diphenylmethanediisocyanate and Viscotrol C mix and blend polyreaction are generated base polyurethane prepolymer for use as;
Step 2, in mass ratio novolac epoxy 20%, base polyurethane prepolymer for use as 40%, carbonyl iron dust 23%, softening agent 10%, solidifying agent is 2%, reinforcing particles 5%, weighs each component starting material,
Step 3, carbonyl iron dust and reinforcing particles graphite added in epoxy resin fully to stir and form uniform mixture;
Step 4, mixture mix and blend in made for step 2 base polyurethane prepolymer for use as and step 3 is formed inierpeneirating network structure, add plasticizer phthalic acid dibutylester and solidifying agent 3-dimethylaminomethylphenol vacuum exhaust bubble under 80 DEG C of conditions;
Step 5, pour in mould by mixture, under 120 DEG C of conditions, deeply-curing obtains Epoxy/Polyurethane interpenetrating(polymer)networks based magnetic rheologic elastomerics.
The present embodiment records within the scope of 20 DEG C-90 DEG C, strain rate is 0.1%, frequency is record dissipation factor under 10Hz condition between for 0.3-0.35; Tensile strength reaches 5.3MPa.Too low due to iron content, causes that magneto-rheological characteristic under magnetic field is not obvious, damping and modulus changes little magnetic rheology effect and be not being met under magnetic field.
Claims (10)
1. high damping magnetic rheology elastic body, is characterized in that: be prepared from by the raw material of following weight proportioning: epoxy resin 5%-10%, base polyurethane prepolymer for use as 10%-20%, carbonyl iron dust 60%-70%, softening agent 4.5%-10%, and solidifying agent is 0.5%-1%; Described epoxy resin is selected from the one in bisphenol A type epoxy resin, brominated epoxy resin or novolac epoxy; Described base polyurethane prepolymer for use as is polyvalent alcohol and isocyanate reaction gained; Described polyvalent alcohol is polyester polyol or polyether glycol; Described isocyanic ester is selected from least one in 2,4-diphenylmethanediisocyanate, 4,4-diphenylmethanediisocyanates and 2,6-tolylene diisocyanate.
2. high damping magnetic rheology elastic body as claimed in claim 1, is characterized in that: the mass ratio of epoxy resin and base polyurethane prepolymer for use as is 1 ︰ 2.
3. high damping magnetic rheology elastic body as claimed in claim 1 or 2, is characterized in that: described raw material also comprises catalyzer or/and reinforcing particles.
4. the high damping magnetic rheology elastic body as described in any one of claims 1 to 3, is characterized in that: be prepared from by the raw material of following weight proportioning: mass ratio 10% shared by epoxy resin, base polyurethane prepolymer for use as 20%, carbonyl iron dust 63%, softening agent 5%, solidifying agent is 1%, catalyzer 1%.
5. the high damping magnetic rheology elastic body as described in any one of Claims 1 to 4, is characterized in that: described epoxy resin is bisphenol A type epoxy resin.
6. the high damping magnetic rheology elastic body as described in any one of Claims 1 to 5, is characterized in that: described polyvalent alcohol is Viscotrol C, and described isocyanic ester is 2,4-diphenylmethanediisocyanate and 4,4-diphenylmethanediisocyanate.
7. the high damping magnetic rheology elastic body as described in claim 3 ~ 6, is characterized in that: described softening agent is phthalic ester, and solidifying agent is 3-dimethylaminomethylphenol, and catalyzer is stannous octoate, and reinforcing particles is carbon black or Graphite Powder 99.
8. high damping magnetic rheology elastic body as claimed in claim 7, is characterized in that: described softening agent is dibutyl phthalate.
9. the preparation method of high damping magnetic rheology elastic body, is characterized in that: comprise the steps: to obtain base polyurethane prepolymer for use as with polyvalent alcohol and isocyanic ester; Prepare raw material according to following ratio: epoxy resin 5%-10%, base polyurethane prepolymer for use as 10%-20%, carbonyl iron dust 60%-70%, softening agent 4.5%-10%, solidifying agent is 0.5%-1%; Carbonyl iron dust is joined in epoxy resin and fully stirs, by the dispersed mixture of formation and base polyurethane prepolymer for use as mix and blend, take out bubble under vacuum conditions after adding softening agent and solidifying agent, curing molding under 80 ~ 120 DEG C of conditions.
10. method as claimed in claim 9, is characterized in that: used after 2 hours in 80 DEG C of dryings by prepared raw material.
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| CN105038137A (en) * | 2015-08-31 | 2015-11-11 | 四川大学 | Composite material integrating structural strength and damping capacity and preparation method and application thereof |
| CN105161238A (en) * | 2015-09-28 | 2015-12-16 | 重庆大学 | Magneto-rheological elastomer with magnetic control negative rigidity characteristic and preparing method thereof |
| CN107418210A (en) * | 2017-06-07 | 2017-12-01 | 常州市瑞泰物资有限公司 | A kind of preparation method of high rheomagnetic magnetorheological elastomer based on silicone rubber |
| CN110669329A (en) * | 2019-10-30 | 2020-01-10 | 陈海艳 | Preparation method of magnetorheological elastomer |
| CN112724604A (en) * | 2020-12-30 | 2021-04-30 | 北京理工大学 | Magnetorheological material, preparation method and iron container repairing method |
| CN112837882A (en) * | 2021-01-07 | 2021-05-25 | 湘潭大学 | Magnetorheological gel flexible grinding wheel |
| CN114751676A (en) * | 2022-04-20 | 2022-07-15 | 中建八局检测科技有限公司 | Noise-reducing magnetorheological pavement material and preparation method thereof |
| CN115746767A (en) * | 2022-12-10 | 2023-03-07 | 苏州铂韬新材料科技有限公司 | Glue with wave absorbing function and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105038137A (en) * | 2015-08-31 | 2015-11-11 | 四川大学 | Composite material integrating structural strength and damping capacity and preparation method and application thereof |
| CN105161238A (en) * | 2015-09-28 | 2015-12-16 | 重庆大学 | Magneto-rheological elastomer with magnetic control negative rigidity characteristic and preparing method thereof |
| CN107418210A (en) * | 2017-06-07 | 2017-12-01 | 常州市瑞泰物资有限公司 | A kind of preparation method of high rheomagnetic magnetorheological elastomer based on silicone rubber |
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| CN112724604A (en) * | 2020-12-30 | 2021-04-30 | 北京理工大学 | Magnetorheological material, preparation method and iron container repairing method |
| CN112724604B (en) * | 2020-12-30 | 2022-07-22 | 北京理工大学 | Magnetorheological material, preparation method and iron container repairing method |
| CN112837882A (en) * | 2021-01-07 | 2021-05-25 | 湘潭大学 | Magnetorheological gel flexible grinding wheel |
| CN114751676A (en) * | 2022-04-20 | 2022-07-15 | 中建八局检测科技有限公司 | Noise-reducing magnetorheological pavement material and preparation method thereof |
| CN115746767A (en) * | 2022-12-10 | 2023-03-07 | 苏州铂韬新材料科技有限公司 | Glue with wave absorbing function and preparation method thereof |
| CN115746767B (en) * | 2022-12-10 | 2023-12-08 | 苏州铂韬新材料科技有限公司 | Glue with wave absorbing function and preparation method thereof |
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