CN113999516B - Vibration damping material and preparation method and application thereof - Google Patents

Vibration damping material and preparation method and application thereof Download PDF

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CN113999516B
CN113999516B CN202111327851.3A CN202111327851A CN113999516B CN 113999516 B CN113999516 B CN 113999516B CN 202111327851 A CN202111327851 A CN 202111327851A CN 113999516 B CN113999516 B CN 113999516B
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vibration damping
parts
acrylic resin
epoxy
damping material
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CN113999516A (en
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罗阳
龙希金
李俊达
潘炜坊
黄劲峰
李国平
何智祥
陈谦慎
张慧
陆新永
陈国柱
杨俊烨
陈志成
李春辉
胡梓新
陈卓昀
李啟耀
林俊烽
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Guangdong Power Grid Co Ltd
Foshan Power Supply Bureau of Guangdong Power Grid Corp
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Guangdong Power Grid Co Ltd
Foshan Power Supply Bureau of Guangdong Power Grid Corp
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
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Abstract

The application belongs to the technical field of vibration damping materials, and particularly relates to a vibration damping material, and a preparation method and application thereof. A vibration damping material of the present application comprising: polyurethane rubber, maleic anhydride grafted polyolefin elastomer, modified polyurethane-epoxy acrylic resin, bisphenol S epoxy resin, polyimide, carbon black, titanium dioxide, glass fiber, stearic acid, defoamer, antioxidant, vulcanizing agent and accelerator; the preparation method of the vibration damping material comprises the following steps: mixing polyurethane rubber, maleic anhydride grafted polyolefin elastomer, modified polyurethane-epoxy acrylic resin, bisphenol S epoxy resin, polyimide, carbon black, titanium dioxide, glass fiber, stearic acid, defoamer, antioxidant, vulcanizing agent and accelerator for vulcanization reaction, and obtaining the vibration damping material. The vibration damping material can solve the technical defects of poor wear resistance, poor ageing, insufficient impact strength and poor flexural fatigue resistance of the motor vibration damping pad in the prior art in continuous use.

Description

Vibration damping material and preparation method and application thereof
Technical Field
The application belongs to the technical field of vibration damping materials, and particularly relates to a vibration damping material, and a preparation method and application thereof.
Background
The motor is used as a common device of mechanical equipment, and mechanical vibration can bring about a plurality of adverse effects on some occasions, such as increased loss, noise generation and the like, and due to the continuity of operation and use of the motor, the motor is required to have good wear resistance and ageing resistance, and noise generated on one hand and continuous vibration are generated in the operation and working process of the motor. The vibration damping pad can reduce noise generation, minimize vibration, and reduce influence on surrounding environment and personnel. The conventional motor vibration damping pad has the problems of poor wear resistance, poor aging, insufficient impact strength, poor flex fatigue resistance and the like in the using process.
Therefore, in order to reduce such adverse effects, vibration can be isolated and the impact caused by the vibration can be absorbed by a vibration absorbing pad or the like. The vibration damping pad is widely applied to various industries such as automobiles, bridges, mechanical equipment, motors, buildings, clothing and the like. In the using process of the existing motor vibration damping pad, the wear resistance and aging resistance are poor due to the persistence of equipment, and the service life of the motor vibration damping pad is influenced. Therefore, it is necessary to develop a highly wear-resistant and aging-resistant vibration-damping pad and to extend the service life of the vibration-damping pad.
Disclosure of Invention
In view of the above, the present application provides a vibration damping material, a preparation method and an application thereof, which can be used for a manufacturing method of a motor vibration damping pad, and is a material with high wear resistance, aging resistance and convenient processing and molding.
A first aspect of the present application provides a vibration damping material comprising:
polyurethane rubber, maleic anhydride grafted polyolefin elastomer, modified polyurethane-epoxy acrylic resin, bisphenol S epoxy resin, polyimide, carbon black, titanium dioxide, glass fiber, stearic acid, defoamer, antioxidant, vulcanizing agent and accelerator;
the structural formula of the modified polyurethane-epoxy acrylic resin is as follows:
Figure GDA0004166275420000021
wherein the R is 1 Is that
Figure GDA0004166275420000022
The R is 2 Is->
Figure GDA0004166275420000023
In another embodiment, the vibration damping material comprises, in parts by weight
Figure GDA0004166275420000024
In another embodiment, the stearic acid is selected from zinc stearate or/and stearic acid 1801; the defoamer is selected from defoamer BYK-088 and/or defoamer BYK141; the antioxidant is selected from: one or more of antioxidants 1135, 1076, and BHT; the vulcanizing agent is selected from one or more of sulfur, vulcanizing agent BP, vulcanizing agent DCBPI and vulcanizing agent DCP; the accelerator is selected from zinc dibenzothiazyl disulfide or/and zinc dimethyl dithiocarbamate.
The second aspect of the present application provides a method for preparing a vibration damping material, comprising the steps of:
step 1, mixing polyurethane rubber, maleic anhydride grafted polyolefin elastomer, modified polyurethane-epoxy acrylic resin, bisphenol S epoxy resin, polyimide, carbon black, titanium dioxide, glass fiber, stearic acid, a defoaming agent and an antioxidant, and heating and banburying to obtain a reactant;
and step 2, mixing the reactant, the vulcanizing agent and the accelerator for vulcanization reaction to obtain the vibration reduction material.
In another embodiment, in the step 1, the temperature of the heating banburying is 80-100 ℃, and the time of the heating banburying is 30-45 min.
In another embodiment, in the step 2, the temperature of the vulcanization reaction is 210 ℃ to 250 ℃; the time of the vulcanization reaction is 15-30 min.
In another embodiment, the preparation method of the modified polyurethane-epoxy acrylic resin comprises the following steps: according to the synthetic route of the modified polyurethane-epoxy acrylic resin, mixing polyurethane acrylic resin, styrene, epoxy acrylate resin and an initiator in a solvent, and carrying out heating reflux reaction to obtain the modified polyurethane-epoxy acrylic resin;
the structural formula of the modified polyurethane-epoxy acrylic resin is as follows:
Figure GDA0004166275420000031
wherein the R is 1 Is that
Figure GDA0004166275420000032
The R is 2 Is->
Figure GDA0004166275420000033
The synthetic route of the modified polyurethane-epoxy acrylic resin is as follows:
Figure GDA0004166275420000041
wherein the R is 1 Is that
Figure GDA0004166275420000042
The R is 2 Is->
Figure GDA0004166275420000043
In another embodiment, the molar ratio of the urethane acrylic resin, the styrene and the epoxy acrylate resin is (1-2): (0.2-0.5): (1-1.5).
The molar ratio of the polyurethane acrylic resin to the styrene to the epoxy acrylate resin is 1:0.2:1.
in another embodiment, the epoxy acrylate resin has a viscosity of 150 to 250cps.
In another embodiment, the solvent is selected from one or more of ethyl acetate, and butyl acetate.
In another embodiment, the initiator is selected from one or more of initiator BPO, initiator AIBN and initiator ABVN.
The third aspect of the application discloses application of the vibration damping material or the vibration damping material prepared by the preparation method in a motor vibration damping pad.
According to the modified polyurethane-epoxy acrylic resin modified polyurethane rubber, the toughness and impact strength of a polyurethane rubber system can be improved, and the polarity in the system can be increased by introducing the maleic anhydride grafted polyolefin elastomer, so that the system can be better combined with other polar and nonpolar materials, and the compatibility of the system is effectively increased by the maleic anhydride grafted polyolefin elastomer.
Compared with the conventional polyurethane and epoxy resin blending mode, the modified polyurethane-epoxy acrylic resin adopted in the application is an amphoteric molecule, so that the compatibility of polyurethane and epoxy resin in a system can be increased, and the mechanical strength is improved. In addition, since the polyurethane rubber has good high elasticity, and is used as the main material of the vibration damping material, bisphenol S epoxy resin is introduced into the polyurethane rubber system, and compared with the conventional epoxy resin, the bisphenol S epoxy resin has strong electron-withdrawing group-sulfonyl in the structure
Figure GDA0004166275420000051
Increasing the damping coefficient of the vibration reduction material; the glass fiber has better bonding property and wettability with the mixed glass fiber, is beneficial to the compatibility of the components, ensures that the components are combined more tightly, and has proper static rigidity.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a structural formula of a modified polyurethane-epoxy acrylic resin provided in an embodiment of the present application;
fig. 2 is a synthetic route of the modified polyurethane-epoxy acrylic resin provided in the examples of the present application.
Detailed Description
The application provides a vibration damping material, a preparation method and application thereof, which are used for solving the technical defects of poor wear resistance, poor ageing, insufficient impact strength and poor flexural fatigue resistance of a motor vibration damping pad in the prior art in continuous use.
The following description of the technical solutions in the embodiments of the present application will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Wherein, the raw materials or reagents used in the following examples are all commercially available or self-made.
The synthetic route of the modified polyurethane-epoxy acrylic resin used in the following examples is shown in FIG. 2, and the preparation method thereof comprises:
the polyurethane acrylic resin, the styrene and the epoxy acrylic resin are mixed according to the mole ratio of 1:0.2:1 into a reactor to obtain a mixture, adding ethyl acetate, wherein the volume ratio of the ethyl acetate to the mixture is 1:1, heating and refluxing, adding an initiator BPO, and stirring for reaction to obtain modified polyurethane-epoxy acrylic resin which is a macromolecular chain amphoteric prepolymer; wherein the epoxy acrylic resin is a low viscosity epoxy acrylic resin having a viscosity of 200cps.
The polyurethane rubber used in the following examples was purchased from Hebei's blue seal material; maleic anhydride grafted polyolefin elastomers are purchased from the dow chemical; polyurethane acrylic resin is purchased from a skillful new resin; epoxy acrylate resins are purchased from changxing materials.
The maleic anhydride grafted polyolefin elastomer of the following examples was POE-g-MAH.
Example 1
The embodiment of the application provides a vibration damping material and a motor vibration damping pad prepared from the vibration damping material, and the vibration damping material specifically comprises the following components:
the vibration damping material comprises the following components: the polyurethane rubber comprises the following components in parts by weight: 60 parts of maleic anhydride grafted polyolefin elastomer: 20 parts of modified polyurethane-epoxy acrylic resin: 15 parts of bisphenol S epoxy resin: 10 parts of polyimide: 10 parts of carbon black: 9 parts of titanium dioxide: 3 parts of glass fiber: 5 parts of zinc stearate: 5 parts of defoamer BYK141:1 part of antioxidant 1076:2 parts of vulcanizing agent DCBPI:4 parts and zinc dibenzothiazyl disulfide: 2.5 parts.
The preparation method of the motor vibration damping pad comprises the following steps: the raw materials (60 parts of polyurethane rubber, 20 parts of maleic anhydride grafted polyolefin elastomer, 15 parts of modified polyurethane-epoxy acrylic resin, 10 parts of bisphenol S epoxy resin, 10 parts of polyimide, 9 parts of carbon black, 3 parts of titanium dioxide, 5 parts of glass fiber, 5 parts of zinc stearate, 1 part of defoamer BYK141 and 1076:2 parts of antioxidant) are added into a banburying device and uniformly mixed. Heating to 95 ℃ and mixing for 40min, and cooling to obtain a reactant. The reactant, 4 parts by weight of vulcanizing agent DCBPI and 2.5 parts by weight of zinc dibenzothiazyl disulfide are put into a vulcanizing machine to be vulcanized for 20 minutes at 230 ℃ to obtain the motor vibration damping pad with excellent wear resistance and aging performance.
Example 2
The embodiment of the application provides a vibration damping material and a motor vibration damping pad prepared from the vibration damping material, and the vibration damping material specifically comprises the following components:
the vibration damping material comprises the following components: the polyurethane rubber comprises the following components in parts by weight: 65 parts of maleic anhydride grafted polyolefin elastomer: 18 parts of modified polyurethane-epoxy acrylic resin: 20 parts of bisphenol S epoxy resin: 12 parts of polyimide: 12 parts of carbon black: 12 parts of titanium dioxide: 3 parts of glass fiber: 6 parts of zinc stearate: 4 parts of defoamer BYK141:1.5 parts of an antioxidant 1076:2.5 parts of vulcanizing agent DCBPI:4.5 parts and zinc dibenzothiazyl disulfide: 3 parts.
The preparation method of the motor vibration damping pad comprises the following steps: the raw materials (65 parts of polyurethane rubber, 18 parts of maleic anhydride grafted polyolefin elastomer, 20 parts of modified polyurethane-epoxy acrylic resin, 12 parts of bisphenol S epoxy resin, 12 parts of polyimide, 12 parts of carbon black, 3 parts of titanium dioxide, 6 parts of glass fiber, 4 parts of zinc stearate, 1.5 parts of defoamer BYK141 and 2.5 parts of antioxidant 1076) are added into a banburying device and uniformly mixed. Heating to 95 ℃ and mixing for 40min, and cooling to obtain a reactant. The reactant, 4.5 parts by weight of vulcanizing agent DCBPI and 3 parts by weight of zinc dibenzothiazyl disulfide are put into a vulcanizing machine to be vulcanized for 20 minutes at 230 ℃ to obtain the motor vibration-damping pad with excellent wear resistance and aging performance.
Example 3
The embodiment of the application provides a vibration damping material and a motor vibration damping pad prepared from the vibration damping material, and the vibration damping material specifically comprises the following components:
the vibration damping material comprises the following components: the polyurethane rubber comprises the following components in parts by weight: 70 parts of maleic anhydride grafted polyolefin elastomer: 16 parts of modified polyurethane-epoxy acrylic resin: 22 parts of bisphenol S epoxy resin: 14 parts of polyimide: 7 parts of carbon black: 15 parts of titanium dioxide: 4.5 parts of glass fiber: 6 parts of zinc stearate: 4.5 parts of defoamer BYK141:1.2 parts of an antioxidant 1076:2.5 parts of vulcanizing agent DCBPI:5 parts of zinc dibenzothiazyl disulfide: 2 parts.
The preparation method of the motor vibration damping pad comprises the following steps: the raw materials (70 parts of polyurethane rubber, 16 parts of maleic anhydride grafted polyolefin elastomer, 22 parts of modified polyurethane-epoxy acrylic resin, 14 parts of bisphenol S epoxy resin, 7 parts of polyimide, 15 parts of carbon black, 4.5 parts of titanium dioxide, 6 parts of glass fiber, 4.5 parts of zinc stearate, 1.2 parts of defoamer BYK141 and 2.5 parts of antioxidant 1076) are added into a banburying device and uniformly mixed. Heating to 95 ℃ and mixing for 40min, and cooling to obtain a reactant. The reactant, 5 parts by weight of vulcanizing agent DCBPI and 2 parts by weight of zinc dibenzothiazyl disulfide are put into a vulcanizing machine to be vulcanized for 20 minutes at 230 ℃ to obtain the motor vibration damping pad with excellent wear resistance and aging performance.
Comparative example 1
The present comparative example provides a control vibration damping material and a control motor vibration damping pad, comprising in particular:
the comparative example does not add polyurethane elastomer rubber.
The control vibration damping material comprises the following components: the maleic anhydride grafted polyolefin elastomer comprises the following components in parts by weight: 30 parts of modified polyurethane-epoxy acrylic resin: 30 parts of bisphenol S epoxy resin: 15 parts of polyimide, 12 parts of carbon black: 8 parts of titanium dioxide: 4 parts of glass fiber: 8 parts of zinc stearate: 5 parts of defoamer BYK141:1 part of antioxidant 1076:2 parts.
The preparation method of the control motor vibration damping pad comprises the following steps: the raw materials (30 parts of maleic anhydride grafted polyolefin elastomer, 30 parts of modified polyurethane-epoxy acrylic resin, 15 parts of bisphenol S epoxy resin, 12 parts of polyimide, 8 parts of carbon black, 4 parts of titanium dioxide, 8 parts of glass fiber, 5 parts of zinc stearate, 1 part of defoamer BYK141 and 1076:2 parts) are added into a banburying device and uniformly mixed. Heating to 95 ℃ and mixing for 40min, and cooling to obtain a reactant. The reactant, 4 parts by weight of the vulcanizing agent DCBPI and 2.5 parts by weight of zinc dibenzothiazyl disulfide are put into a vulcanizing machine and vulcanized for 20 minutes at 230 ℃ to obtain the control motor vibration damping pad.
Comparative example 2
The present comparative example provides a control vibration damping material and a control motor vibration damping pad, comprising in particular:
the comparative example does not add maleic anhydride grafted polyolefin elastomer.
The control vibration damping material comprises the following components: polyurethane elastomer rubber: 65 parts of modified polyurethane-epoxy acrylic resin: 25 parts of bisphenol S epoxy resin: 10 parts of polyimide, 8 parts of carbon black: 9 parts of titanium dioxide: 4 parts of glass fiber: 8 parts of stearic acid: 5 parts of defoamer BYK141:1 part of antioxidant 1076:2 parts.
The preparation method of the control motor vibration damping pad comprises the following steps: the raw materials (65 parts of polyurethane elastomer rubber, 25 parts of modified polyurethane-epoxy acrylic resin, 10 parts of bisphenol S epoxy resin, 8 parts of polyimide, 9 parts of carbon black, 4 parts of titanium dioxide, 8 parts of glass fiber, 5 parts of stearic acid, 1 part of defoamer BYK141 and 1076:2 parts of antioxidant) are added into a banburying device and uniformly mixed. Heating to 95 ℃ and mixing for 40min, and cooling to obtain a reactant. The reactant, 4.5 parts by weight of the vulcanizing agent DCBPI and 3 parts by weight of zinc dibenzothiazyl disulfide are put into a vulcanizing machine and vulcanized for 20 minutes at 230 ℃ to obtain the control motor vibration damping pad.
Comparative example 3
The present comparative example provides a control vibration damping material and a control motor vibration damping pad, comprising in particular:
the comparative example does not add modified polyurethane-epoxy acrylic resin.
The control vibration damping material comprises the following components: polyurethane elastomer rubber: 70 parts of maleic anhydride grafted polyolefin elastomer, 15 parts of bisphenol S epoxy resin: 15 parts of polyimide, 10 parts of carbon black: 9 parts of titanium dioxide: 4 parts of glass fiber: 8 parts of hard fatty acid: 5 parts, 1 part of defoamer BYK141 and 2 parts of antioxidant 1076.
The preparation method of the control motor vibration damping pad comprises the following steps: the raw materials (70 parts of polyurethane elastomer rubber, 15 parts of maleic anhydride grafted polyolefin elastomer, 15 parts of bisphenol S epoxy resin, 10 parts of polyimide, 9 parts of carbon black, 4 parts of titanium dioxide, 8 parts of glass fiber, 5 parts of hard fatty acid, 1 part of defoamer BYK141 and 1076:2 parts of antioxidant) are added into a banburying device and uniformly mixed. Heating to 95 ℃ and mixing for 40min, and cooling to obtain a reactant. The reactant, 4.5 parts by weight of the vulcanizing agent DCBPI and 2 parts by weight of zinc dibenzothiazyl disulfide are put into a vulcanizing machine and vulcanized for 20 minutes at 230 ℃ to obtain the control motor vibration damping pad.
The motor vibration damping pads of examples 1 to 3 and comparative examples 1 to 3 were tested for tensile strength, elongation at break, shore a hardness and damping coefficient, and the results are shown in table 1.
TABLE 1
Tensile Strength/MPa Elongation at break/% Shore A hardness Damping coefficient
Example 1 78 467 75 1.43
Example 2 80 463 76 1.41
Example 3 76 474 78 1.44
Comparative example 1 65 402 78 1.23
Comparative example 2 67 385 76 1.32
Comparative example 3 62 374 80 1.28
From the data, the modified polyurethane-epoxy acrylic resin is introduced by the synergistic effect of the four raw materials through adding polyurethane rubber, maleic anhydride grafted polyolefin elastomer, modified polyurethane-epoxy acrylic resin and bisphenol S epoxy resin into the vibration damping main material, so that the single mixing mode in the past is changed, polar and nonpolar materials in the components can be better combined, the compatibility in the system is increased, and the vibration damping main material has better physical and mechanical properties; in addition, the vibration damping material prepared by adding the modified polyurethane-epoxy acrylic resin has the characteristics of good wear resistance, ageing resistance and good tensile strength.
The foregoing is merely a preferred embodiment of the present application and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims (10)

1. A vibration damping material, comprising:
polyurethane rubber, maleic anhydride grafted polyolefin elastomer, modified polyurethane-epoxy acrylic resin, bisphenol S epoxy resin, polyimide, carbon black, titanium dioxide, glass fiber, stearic acid, defoamer, antioxidant, vulcanizing agent and accelerator;
the structural formula of the modified polyurethane-epoxy acrylic resin is as follows:
Figure FDA0004166275410000011
wherein the R is 1 Is that
Figure FDA0004166275410000012
The R is 2 Is->
Figure FDA0004166275410000013
The maleic anhydride grafted polyolefin elastomer is POE-g-MAH.
2. The vibration-damping material according to claim 1, characterized in that it comprises, in parts by weight
Figure FDA0004166275410000014
Figure FDA0004166275410000021
3. Damping material according to claim 1 or 2, characterized in that the stearic acid is selected from zinc stearate or/and stearic acid 1801; the defoamer is selected from defoamer BYK-088 and/or defoamer BYK141; the antioxidant is selected from: one or more of antioxidants 1135, 1076, and BHT; the vulcanizing agent is selected from one or more of vulcanizing agent BP, vulcanizing agent DCBPI and vulcanizing agent DCP; the accelerator is selected from zinc dibenzothiazyl disulfide or/and zinc dimethyl dithiocarbamate.
4. The preparation method of the vibration damping material is characterized by comprising the following steps of:
step 1, mixing polyurethane rubber, maleic anhydride grafted polyolefin elastomer, modified polyurethane-epoxy acrylic resin, bisphenol S epoxy resin, polyimide, carbon black, titanium dioxide, glass fiber, stearic acid, a defoaming agent and an antioxidant, and heating and banburying to obtain a reactant;
the structural formula of the modified polyurethane-epoxy acrylic resin is as follows:
Figure FDA0004166275410000022
wherein the R is 1 Is that
Figure FDA0004166275410000023
The R is 2 Is->
Figure FDA0004166275410000024
Step 2, mixing the reactant, the vulcanizing agent and the accelerator for vulcanization reaction to obtain the vibration reduction material;
the maleic anhydride grafted polyolefin elastomer is POE-g-MAH.
5. The method according to claim 4, wherein in the step 1, the temperature of the heating banburying is 80-100 ℃, and the time of the heating banburying is 30-45 min.
6. The method according to claim 4, wherein in the step 2, the temperature of the vulcanization reaction is 210 ℃ to 250 ℃; the time of the vulcanization reaction is 15-30 min.
7. The method of producing the modified polyurethane-epoxy acrylic resin according to claim 4, wherein the method of producing the modified polyurethane-epoxy acrylic resin comprises: according to the synthetic route of the modified polyurethane-epoxy acrylic resin, mixing the polyurethane acrylic resin, styrene, epoxy acrylate resin and an initiator in a solvent, and carrying out heating reflux reaction to obtain the modified polyurethane-epoxy acrylic resin;
the structural formula of the modified polyurethane-epoxy acrylic resin is as follows:
Figure FDA0004166275410000031
wherein the R is 1 Is that
Figure FDA0004166275410000032
The R is 2 Is->
Figure FDA0004166275410000033
The synthetic route of the modified polyurethane-epoxy acrylic resin is as follows:
Figure FDA0004166275410000034
wherein the R is 1 Is that
Figure FDA0004166275410000041
The R is 2 Is->
Figure FDA0004166275410000042
8. The method according to claim 7, wherein the molar ratio of the urethane acrylic resin, the styrene and the epoxy acrylate resin is (1-2): 0.2-0.5): 1-1.5.
9. The method of claim 7, wherein the epoxy acrylate resin has a viscosity of 150 to 250cps.
10. Use of a vibration damping material according to any one of claims 1 to 3 or a vibration damping material produced by a method according to any one of claims 4 to 9 in a vibration damping pad for an electric motor.
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