Rubber material for motor damping and preparation method thereof

Abstract

The invention discloses a rubber material for motor damping and a preparation method thereof, and the rubber material comprises the following components in parts by mass: 60-80 parts of nitrile rubber, 20-40 parts of brominated butyl rubber, 40-60 parts of a reinforcing agent, 20-30 parts of a softening agent, 5-10 parts of an active agent, 4-8 parts of an anti-aging agent, 5-20 parts of a damping agent, 1.55-1.75 parts of a rubber composite vulcanizing agent and 0.5-2 parts of an accelerant. Wherein the sum of the mass parts of the nitrile rubber and the brominated butyl rubber is 100, the rubber composite vulcanizing agent is at least two of 4, 4 '-dithiodimorpholine DTDM, dipentamethylenethiuram tetrasulfide DPTT and tetramethylthiuram disulfide TT, and the technical problem that in the prior art, the vibration noise of a motor in a range hood is large is solved.

Description

Technical Field

[0001] The invention belongs to the field of polymer materials, and in particular relates to a rubber material for motor vibration reduction and a preparation method thereof. Background Art

[0002] As people's living standards continue to improve, the requirements for vibration and noise of range hoods are getting higher and higher. However, although the existing rubber-based shock-absorbing materials have good shock-absorbing performance, their oil resistance and high temperature resistance are poor, that is, they cannot simultaneously meet the requirements of excellent mechanical strength, oil resistance, high temperature resistance and good shock-absorbing performance required by range hood motor shock-absorbing materials.

[0003] Therefore, most of the damping materials for range hood motors in the related art are silicone materials, because silicone has outstanding high temperature resistance and oil resistance. However, the damping performance of silicone is poor, and it cannot effectively reduce the vibration of the range hood housing, thereby transmitting the vibration to the range hood housing, resulting in obvious noise. Summary of the invention

[0004] The object of the present invention is to provide a rubber material for motor vibration reduction and a preparation method thereof, so as to solve the technical problem of large vibration noise of the motor of the range hood in the above-mentioned prior art.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme:

[0006] A rubber material for motor vibration reduction, comprising the following components in parts by mass:

[0007] 60-80 parts of nitrile rubber, 20-40 parts of brominated butyl rubber, 40-60 parts of reinforcing agent, 20-30 parts of softening agent, 5-10 parts of activating agent, 4-8 parts of antioxidant, 5-20 parts of damping agent, 1.55-1.75 parts of rubber composite vulcanizing agent, 0.5-2 parts of accelerator, wherein the total mass parts of the nitrile rubber and brominated butyl rubber is 100 parts; the rubber composite vulcanizing agent is at least two of 4,4'-dimorpholine disulfide DTDM, dipentylene thiuram tetrasulfide DPTT, and tetramethylthiuram disulfide TT.

[0008] Compared with the prior art, the advantages and beneficial effects of the embodiments of the present disclosure are: by using nitrile rubber and brominated butyl rubber together, and rationally optimizing the type and content of the rubber composite vulcanizer, and rationally selecting a damping agent, a rubber material suitable for motor shock absorption in a range hood is prepared. Because nitrile rubber has excellent oil resistance and heat resistance, and brominated butyl rubber has good shock absorption performance, the two are used together, and a suitable damping agent is added at the same time, so that the rubber material can simultaneously meet the requirements of oil resistance, heat resistance and good shock absorption effect. However, since nitrile rubber is a polar rubber, and brominated butyl rubber is a butyl rubber with a small amount of bromine introduced, the brominated butyl rubber has a certain polarity. However, due to the low bromine content, the polarity of brominated butyl rubber is quite different from that of nitrile rubber; at the same time, sulfur is usually used as a vulcanizing agent in the related art, so that when the two rubbers are used together, their vulcanization speeds differ greatly due to their large polarity difference, which makes the mechanical strength of the rubber material after the use poor, that is, it cannot meet the required requirements of the use conditions. However, the present invention solves the problem of the large difference in vulcanization speeds by using a reasonable vulcanizing agent to adjust the vulcanization speeds of the two rubbers, thereby making them have good mechanical strength. Therefore, by combining nitrile rubber, brominated butyl rubber, damping agent and a reasonable combination of rubber composite vulcanizing agents, the prepared rubber material has both excellent mechanical strength and excellent heat resistance, high temperature resistance and shock absorption performance, solving the technical problem of large motor vibration noise of the range hood in the prior art.

[0009] Based on the above technical solution, the embodiment of the present disclosure may also be improved as follows.

[0010] In a possible implementation, the following components are included in parts by mass:

[0011] 70 parts of nitrile rubber, 30 parts of brominated butyl rubber, 40-60 parts of reinforcing agent, 20-30 parts of softening agent, 5-10 parts of activating agent, 4-8 parts of antioxidant, 5-20 parts of damping agent, 1.55-1.75 parts of rubber composite vulcanizing agent, 0.5-2 parts of accelerator, wherein the total mass parts of nitrile rubber and brominated butyl rubber is 100 parts.

[0012] In a possible implementation, the nitrile rubber is preferably a nitrile rubber having an acrylonitrile content of 36%-42%; the brominated butyl rubber is preferably a brominated butyl rubber having a bromine content of 1.5%-2.5%.

[0013] In a possible implementation, the reinforcing agent is carbon black, and the carbon black is 45 to 55 parts.

[0014] In a possible implementation, the carbon black preferably has a DBP oil absorption value of 121 cm3 / 100g.

[0015] In a possible implementation, the softener is dioctyl terephthalate.

[0016] In a possible implementation, the damping agent is one or more of C5, C9 petroleum resin, hydrogenated C5 or hydrogenated C9 petroleum resin.

[0017] In a possible implementation, the rubber composite vulcanizing agent is preferably a combination of 4,4′-dimorpholine disulfide DTDM and dipentylene thiuram tetrasulfide DPTT, and the accelerator is preferably 2,2′-dibenzothiazole disulfide DM.

[0018] In a possible implementation, the following components are included in parts by mass:

[0019] 70 parts of nitrile rubber, 30 parts of brominated butyl rubber, 45 parts of carbon black, 25 parts of dioctyl terephthalate DOTP, 5 parts of zinc oxide, 1.5 parts of antioxidant MB, 2.0 parts of antioxidant 445, 5 parts of C5 resin, 0.8 parts of vulcanizing agent DTDM, 0.75 parts of vulcanizing agent DPTT, and 1 part of accelerator DM.

[0020] A method for preparing a rubber material for motor vibration reduction comprises the following steps:

[0021] Step 1: Add nitrile rubber and bromobutyl rubber into an internal mixer and mix for 60 to 90 seconds;

[0022] Step 2: Add the reinforcing agent and the damping agent into an internal mixer and mix for 120 to 240 seconds;

[0023] Step 3: Add the softener into the internal mixer and mix for 180 to 240 seconds;

[0024] Step 4: Mix the antioxidant in an internal mixer to 135°C;

[0025] Step 5: Discharge the rubber to the sheet machine for air cooling to obtain the masterbatch, and leave it for more than 2 hours;

[0026] Step 6: Put the cooled and parked masterbatch into an internal mixer and mix for 30 to 60 seconds;

[0027] Step 7: Add zinc oxide, composite vulcanizing agent and accelerator into an internal mixer, mix for 40 to 50 seconds, raise and lower the top bolt once, continue mixing until the temperature reaches 80°C, discharge the rubber and cool the sheets to the sheet machine, and obtain the motor damping rubber material. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Specifically, it includes the following components in parts by weight:

[0030] 60-80 parts of nitrile rubber, 20-40 parts of brominated butyl rubber, 40-60 parts of reinforcing agent, 20-30 parts of softening agent, 5-10 parts of activating agent, 4-8 parts of antioxidant, 5-20 parts of damping agent, 1.55-1.75 parts of rubber composite vulcanizing agent, 0.5-2 parts of accelerator, wherein the total mass parts of the nitrile rubber and brominated butyl rubber is 100 parts; the rubber composite vulcanizing agent is at least two of 4,4'-dimorpholine disulfide DTDM, dipentylene thiuram tetrasulfide DPTT, and tetramethylthiuram disulfide TT.

[0031] The present invention uses nitrile rubber and brominated butyl rubber in combination, and reasonably optimizes and matches the type and content of the rubber composite vulcanizer, and reasonably selects a damping agent to prepare a rubber material suitable for motor shock absorption in a range hood. Because nitrile rubber has excellent oil resistance and heat resistance, and brominated butyl rubber has good shock absorption performance, the two are used in combination, and an appropriate damping agent is added at the same time, so that the rubber material can simultaneously meet the requirements of oil resistance, heat resistance and good shock absorption effect. However, since nitrile rubber is a polar rubber, and brominated butyl rubber is a small amount of bromine element introduced on the basis of butyl rubber, the brominated butyl rubber has a certain polarity. However, due to the low bromine content, the polarity of brominated butyl rubber is greatly different from that of nitrile rubber; at the same time, sulfur is usually used as a vulcanizing agent in the related art, so that when the two rubbers are used in combination, their vulcanization speeds are greatly different due to their large polarity difference, so that the mechanical strength of the rubber material after the combination is poor, that is, it cannot meet the required requirements of the use conditions. However, the present invention solves the problem of large difference in vulcanization speeds of the two rubbers by using a reasonable vulcanizing agent to adjust the vulcanization speeds of the two rubbers, thereby making them have good mechanical strength. Therefore, by combining nitrile rubber, brominated butyl rubber, damping agent and a reasonable rubber composite vulcanizing agent, the prepared rubber material has both excellent mechanical strength and excellent heat resistance, high temperature resistance and shock absorption performance, solving the technical problem of large vibration noise of the motor of the range hood in the prior art.

[0032] In a preferred embodiment, the content of nitrile rubber is 60 parts and the content of bromobutyl rubber is 40 parts.

[0033] In a preferred embodiment, the nitrile rubber is preferably a nitrile rubber having an acrylonitrile content of 36%-42%, and the brominated butyl rubber is preferably a brominated butyl rubber having a bromine content of 1.5%-2%.

[0034] Specifically, nitrile rubber (NBR) is a synthetic rubber copolymerized from butadiene and acrylonitrile, and its performance characteristics include excellent oil resistance, heat resistance, aging resistance, good wear resistance and air tightness. The performance of nitrile rubber is affected by the acrylonitrile content. As the acrylonitrile content increases, the tensile strength, heat resistance, oil resistance, air tightness and hardness increase, but the elasticity and cold resistance decrease. Among them,

[0035] a) Extremely high acrylonitrile butadiene rubber: the acrylonitrile content is above 43%.

[0036] b) High acrylonitrile nitrile rubber: The acrylonitrile content is between 36% and 42%.

[0037] c) Medium-high acrylonitrile nitrile rubber: The acrylonitrile content is between 31% and 35%.

[0038] d) Medium acrylonitrile butadiene rubber: the acrylonitrile content is between 25% and 30%.

[0039] e) Low acrylonitrile nitrile rubber: the acrylonitrile content is below 24%.

[0040] In this embodiment, based on the vibration reduction working condition of the motor in the range hood, the rubber material needs to have good oil resistance, heat resistance, aging resistance, wear resistance and low elasticity. Therefore, in this embodiment, nitrile rubber with an acrylonitrile content of 41% is preferred.

[0041] Brominated butyl rubber (BIIR) is an isobutylene-isoprene copolymer elastomer containing active bromine, because brominated butyl rubber has the basic saturated main chain of butyl rubber, so it has the multiple characteristic performance of butyl polymer, such as higher physical strength, good shock absorption, low permeability, aging resistance and weather resistance aging. Meanwhile, its low permeability characteristic makes it can keep stable performance under various environments, avoids the infiltration influence of external substances. Wherein, bromine content has a significant impact on the vulcanization performance of brominated butyl rubber, and suitable bromine content can improve the vulcanization rate and the bonding property of rubber, makes its vulcanization reaction more flexible simultaneously, can adapt to more extensive vulcanization conditions, improves the applicability and stability of product. In the present embodiment, be preferably bromine content is 2% brominated butyl rubber.

[0042] Therefore, the preferred nitrile rubber (NBR) has good oil resistance, heat resistance, aging resistance, wear resistance and good cold resistance; brominated butyl rubber (BIIR) has high physical strength, good shock absorption, low permeability, aging resistance and weather resistance. The two rubbers are used together, so that the synthesized rubber material has good oil resistance, heat resistance, aging resistance, wear resistance, and good shock absorption effect.

[0043] In a preferred embodiment, the reinforcing agent may be carbon black, and the carbon black content may be 45-55 parts. Among them, carbon black may be used in amounts of 45, 50, 55, etc. Carbon black has an excellent reinforcing effect and can significantly improve the strength, wear resistance and elasticity of rubber. However, since the rubber compound in this embodiment needs to have relatively low elasticity, it is also important to select a suitable amount of carbon black to be added. In this embodiment, carbon black is preferably 45 parts, which can make the rubber material have a good reinforcing effect, while ensuring that the elasticity of the rubber is relatively low, and will not affect the shock absorbing effect of the rubber material.

[0044] In addition, the oil absorption value of carbon black is an important indicator to measure its surface adsorption performance, which reflects the amount of oil absorbed by unit mass of carbon black. The oil absorption value has a significant impact on the performance of carbon black. The surface of carbon black with a higher oil absorption value has more non-polar functional groups, which is easily compatible with oily base materials, thereby improving the dispersion performance in rubber, plastic and other materials. Adding carbon black with a high oil absorption value to rubber can increase the filler content of the rubber and enhance the mechanical properties of the rubber, such as strength and wear resistance. In this embodiment, the carbon black preferably has a DBP oil absorption value of 121cm 3 / 100g.

[0045] In a preferred embodiment, the composite rubber vulcanizing agent is preferably a combination of 4,4′-dimorpholine disulfide DTDM and dipentylthiuram tetrasulfide DPTT.

[0046] The accelerator is preferably 2,2'-dibenzothiazole disulfide DM.

[0047] In order to better illustrate the rubber material used for motor vibration reduction, a detailed description will be given below in combination with comparative examples and embodiments.

[0048] Comparative Example

[0049] The grade of the silicone rubber used is GX2150-U, with a hardness of 50A.

[0050] Example 1

[0051] 60 parts of nitrile rubber, 40 parts of brominated butyl rubber, 45 parts of carbon black, 25 parts of dioctyl terephthalate DOTP, 5 parts of zinc oxide, 1.5 parts of antioxidant MB, 2.0 parts of antioxidant 445, 5 parts of C5 resin, 0.8 parts of vulcanizing agent DTDM, 0.75 parts of vulcanizing agent DPTT, and 1 part of accelerator DM.

[0052] The specific preparation steps are as follows:

[0053] Step 1: Add nitrile rubber and bromobutyl rubber into an internal mixer and mix for 60 to 90 seconds;

[0054] Step 2: Add carbon black and C5 resin into an internal mixer and mix for 120 to 240 seconds;

[0055] Step 3: Add the softener into the internal mixer and mix for 180 to 240 seconds;

[0056] Step 4: Mix the antioxidant in an internal mixer to 135°C;

[0057] Step 5: Discharge the rubber to the sheet machine for air cooling to obtain the masterbatch, and leave it for more than 2 hours;

[0058] Step 6: Put the cooled and parked masterbatch into an internal mixer and mix for 30 to 60 seconds;

[0059] Step 7: Add zinc oxide, vulcanizing agent and accelerator into an internal mixer, mix for 40 to 50 seconds, raise and lower the top bolt once, continue mixing until the temperature reaches 80°C, discharge the rubber and cool the sheets out of the sheet machine with air to obtain a shock-absorbing rubber material.

[0060] Example 2

[0061] The difference between Example 2 and Example 1 is that the ratio of the nitrile rubber and the brominated butyl rubber is different: 70 parts of the nitrile rubber and 30 parts of the brominated butyl rubber.

[0062] Example 3

[0063] The difference between Example 3 and Example 1 is that the ratio of the nitrile rubber and the brominated butyl rubber is different, that is, 80 parts of the nitrile rubber and 20 parts of the brominated butyl rubber.

[0064] Example 4

[0065] 70 parts of nitrile rubber, 30 parts of brominated butyl rubber, 50 parts of carbon black, 25 parts of dioctyl terephthalate DOTP, 5 parts of zinc oxide, 1.5 parts of antioxidant MB, 2.0 parts of antioxidant 445, 10 parts of C5 resin, 1 part of vulcanizing agent DTDM, 0.75 parts of vulcanizing agent DPTT, and 1 part of accelerator DM.

[0066] The specific preparation steps are as follows:

[0067] Step 1: Add nitrile rubber and bromobutyl rubber into an internal mixer and mix for 60 to 90 seconds;

[0068] Step 2: Add carbon black and C5 resin into an internal mixer and mix for 120 to 240 seconds;

[0069] Step 3: Add the softener into the internal mixer and mix for 180 to 240 seconds;

[0070] Step 4: Mix the antioxidant in an internal mixer to 135°C;

[0071] Step 5: Discharge the rubber to the sheet machine for air cooling to obtain the masterbatch, and leave it for more than 2 hours;

[0072] Step 6: Put the cooled and parked masterbatch into an internal mixer and mix for 30 to 60 seconds;

[0073] Step 7: Add zinc oxide, vulcanizing agent and accelerator into an internal mixer, mix for 40 to 50 seconds, raise and lower the top bolt once, continue mixing until the temperature reaches 80°C, discharge the rubber and cool the sheets out of the sheet machine with air to obtain a shock-absorbing rubber material.

[0074] Example 5

[0075] 70 parts of nitrile rubber, 30 parts of brominated butyl rubber, 55 parts of carbon black, 25 parts of dioctyl terephthalate DOTP, 5 parts of zinc oxide, 1.5 parts of antioxidant MB, 2.0 parts of antioxidant 445, 20 parts of C5 resin, 1 part of vulcanizing agent DTDM, 0.75 parts of vulcanizing agent DPTT, and 1 part of accelerator DM.

[0076] The specific preparation steps are as follows:

[0077] Step 1: Add nitrile rubber and bromobutyl rubber into an internal mixer and mix for 60 to 90 seconds;

[0078] Step 2: Add carbon black and C5 resin into an internal mixer and mix for 120 to 240 seconds;

[0079] Step 3: Add the softener into the internal mixer and mix for 180 to 240 seconds;

[0080] Step 4: Mix the antioxidant in an internal mixer to 135°C;

[0081] Step 5: Discharge the rubber to the sheet machine for air cooling to obtain the masterbatch, and leave it for more than 2 hours;

[0082] Step 6: Put the cooled and parked masterbatch into an internal mixer and mix for 30 to 60 seconds;

[0083] Step 7: Add zinc oxide, vulcanizing agent and accelerator into an internal mixer, mix for 40 to 50 seconds, raise and lower the top bolt once, continue mixing until the temperature reaches 80°C, discharge the rubber and cool the sheets out of the sheet machine with air to obtain a shock-absorbing rubber material.

[0084] Example 6

[0085] 70 parts of nitrile rubber, 30 parts of brominated butyl rubber, 55 parts of carbon black, 25 parts of dioctyl terephthalate DOTP, 5 parts of zinc oxide, 1.5 parts of antioxidant MB, 2.0 parts of antioxidant 445, 20 parts of C5 resin, 0.5 parts of sulfur, 1 part of vulcanizing agent DTDM, 0.75 parts of vulcanizing agent DPTT, and 1 part of accelerator DM.

[0086] The specific preparation steps are as follows:

[0087] Step 1: Add nitrile rubber and bromobutyl rubber into an internal mixer and mix for 60 to 90 seconds;

[0088] Step 2: Add carbon black and C5 resin into an internal mixer and mix for 120 to 240 seconds;

[0089] Step 3: Add the softener into the internal mixer and mix for 180 to 240 seconds;

[0090] Step 4: Mix the antioxidant in an internal mixer to 135°C;

[0091] Step 5: Discharge the rubber to the sheet machine for air cooling to obtain the masterbatch, and leave it for more than 2 hours;

[0092] Step 6: Put the cooled and parked masterbatch into an internal mixer and mix for 30 to 60 seconds;

[0093] Step 7: Add zinc oxide, vulcanizing agent and accelerator into an internal mixer, mix for 40 to 50 seconds, raise and lower the top bolt once, continue mixing until the temperature reaches 80°C, discharge the rubber and cool the sheets out of the sheet machine with air to obtain a shock-absorbing rubber material.

[0094] Example 7

[0095] 70 parts of nitrile rubber, 30 parts of brominated butyl rubber, 55 parts of carbon black, 25 parts of dioctyl terephthalate DOTP, 5 parts of zinc oxide, 1.5 parts of antioxidant MB, 2.0 parts of antioxidant 445, 20 parts of C5 resin, 1.0 parts of sulfur, 1 part of vulcanizing agent DTDM, 0.75 parts of vulcanizing agent DPTT, and 1 part of accelerator DM.

[0096] The specific preparation steps are as follows:

[0097] Step 1: Add nitrile rubber and bromobutyl rubber into an internal mixer and mix for 60 to 90 seconds;

[0098] Step 2: Add carbon black and C5 resin into an internal mixer and mix for 120 to 240 seconds;

[0099] Step 3: Add the softener into the internal mixer and mix for 180 to 240 seconds;

[0100] Step 4: Mix the antioxidant in an internal mixer to 135°C;

[0101] Step 5: Discharge the rubber to the sheet machine for air cooling to obtain the masterbatch, and leave it for more than 2 hours;

[0102] Step 6: Put the cooled and parked masterbatch into an internal mixer and mix for 30 to 60 seconds;

[0103] Step 7: Add zinc oxide, vulcanizing agent and accelerator into an internal mixer, mix for 40 to 50 seconds, raise and lower the top bolt once, continue mixing until the temperature reaches 80°C, discharge the rubber and cool the sheets out of the sheet machine with air to obtain a shock-absorbing rubber material.

[0104] Testing standards and methods for rubber materials and products used for motor vibration reduction:

[0105] 1. Mechanical properties test of rubber compounds:

[0106] The hardness is tested according to GB / T 531.1-2008 standard, the tensile strength, tensile stress and elongation at break are tested according to GB / T 528-2009 standard, the tear strength is tested according to GB / T 529-2008 standard, the compression set is tested according to GB / T7759.1-2015 and GB / T7759.2-2014 standards, the resilience is tested according to GB / T1681-2009 standard, the heat aging performance is tested according to GB / T 3512-2014 standard, and the ozone aging resistance is tested according to GB / T 7762-2014 standard.

[0107] 2. Loss factor performance test: The vulcanized rubber is cut into a square of 6mm*6mm, the sample thickness is 2mm, the dynamic mechanical properties are tested, the test temperature range is -80℃~80℃, the test mode is shear mode, the maximum force amplitude is 5N, the maximum displacement amplitude is 10um, and the test frequency is 30Hz.

[0108] 3. Vibration performance test: AHAI 1041 dynamic signal analyzer software is used to collect amplitude data of the range hood front panel during operation.

[0109] Table 1 Comparative data of mechanical properties of the rubber materials of the comparative examples and the examples

[0110]

[0111] Table 2 Comparative data of loss factors of comparative examples and examples

[0112]

[0113] Table 3 Comparative data of vibration performance of comparative examples and examples

[0114]

[0115]

[0116] It can be seen from Table 1 that compared with the comparative example and Examples 1 to 5, the heat resistance of the silicone is relatively excellent, and the tensile strength, elongation at break and oil resistance are slightly inferior to those of the examples.

[0117] It can be seen from Table 2 that the loss factor in the comparative example is significantly lower than that in Examples 1 to 5.

[0118] At the same time, it can be seen from Table 3 that the amplitude of the front panel of the product in the comparative example is significantly higher than the amplitude in Examples 1 to 5. It needs to be further explained that the reason why silica gel cannot meet the requirements of loss factor and amplitude is that the main chain of silica gel is an SI-O bond, and the rotation within the main chain is easier, which makes the damping factor of the silicone vulcanizate small. Nitrile rubber has a higher damping characteristic due to its acrylonitrile group with greater polarity. Bromobutyl rubber has a higher damping characteristic due to the dense methyl groups in the side chain, which makes the vulcanizate have a higher damping characteristic. Based on the characteristics of the above molecular structure, nitrile rubber and brominated butyl rubber have a higher damping characteristic when used together.

[0119] Based on the above, it can be seen that the present invention combines nitrile rubber, brominated butyl rubber, damping agent and a reasonable combination of rubber composite vulcanizing agents, so that the prepared rubber material has both excellent mechanical strength and excellent heat resistance, high temperature resistance and shock absorption performance, thereby solving the technical problem of large motor vibration noise of range hoods in the prior art.

[0120] In addition, by comparing Example 2, Example 6 and Example 7, it can be seen that: when a small amount of sulfur is added to the formula and as the amount of sulfur increases, the tensile strength and elongation at break are significantly reduced, the hardness gradually increases, and the hardness after hot air aging increases significantly, which cannot meet the performance requirements. This may be due to the large difference in the solubility of sulfur in nitrile rubber and bromobutyl rubber, which causes stress concentration in the rubber during stretching and leads to early fracture. By using a sulfur carrier vulcanizing agent, such problems can be effectively avoided, the mechanical properties are significantly improved, and the performance index requirements of the product can be met.

[0121] It can be seen from this that even if nitrile rubber and brominated butyl rubber are used together, and sulfur commonly used in the relevant technology is used as a vulcanizing agent, the performance requirements cannot be met. Therefore, it is also crucial to select a suitable vulcanizing agent, that is, in the embodiment of the present disclosure, a composite rubber vulcanizing agent is selected, preferably 4,4′-dimorpholine disulfide DTDM and dipentylene thiuram tetrasulfide DPTT are used together, so that the prepared rubber material has both excellent mechanical strength and excellent heat resistance, high temperature resistance and shock absorption performance, thereby solving the technical problem of large motor vibration noise of the range hood in the prior art.

[0122] Further, it can be seen from Tables 1 to 3 that as the proportion of brominated butyl rubber increases and the proportion of nitrile rubber decreases, the hardness and oil resistance of the rubber gradually decrease. When the proportion of brominated butyl rubber reaches 40 parts, the tensile strength decreases significantly. However, when the proportion of brominated butyl rubber is 20 parts, the loss factor of the rubber material is small and the amplitude of the product is large, so its damping and shock absorption effect is poor. Therefore, it can be seen from Tables 1 to 3 that when the proportion of nitrile rubber and brominated butyl rubber is 70:30, the vulcanized rubber material can have good mechanical properties and damping and shock absorption performance at the same time.

[0123] By comparing Example 2, Example 4 and Example 5, it can be seen that as the amount of damping agent C5 resin increases, the loss factor gradually increases, and the amplitude of the product also tends to decrease, which shows that as the damping agent content increases, the damping effect becomes better. However, it can also be seen that when the damping agent content is 20 parts, the hardness and tensile strength of the vulcanized rubber are significantly reduced, and the elongation at break gradually increases, which shows that the C5 resin plays a softening and plasticizing role.

[0124] In other words, the addition of damping agent C5 resin further enhances the damping properties of the rubber material, increases the loss factor, and thus improves the damping and shock absorption performance, and as the amount of C5 resin increases, the damping properties of the vulcanized rubber further increase. However, adding too much C5 resin will reduce the mechanical properties of the rubber material, so the preferred amount of C5 resin is 5 parts.

[0125] Based on the above, it can be seen that the present invention combines nitrile rubber, brominated butyl rubber, damping agent and a reasonable combination of rubber composite vulcanizing agents, so that the prepared rubber material has both excellent mechanical strength and excellent heat resistance, high temperature resistance and shock absorption performance, thereby solving the technical problem of large motor vibration noise of range hoods in the prior art.

Claims

1. A rubber material for motor vibration reduction, characterized in that: The composition comprises the following components in parts by weight: 60-80 parts of nitrile rubber, 20-40 parts of brominated butyl rubber, 40-60 parts of reinforcing agent, 20-30 parts of softening agent, 5-10 parts of activating agent, 4-8 parts of antioxidant, 5-20 parts of damping agent, 1.55-1.75 parts of rubber composite vulcanizing agent, 0.5-2 parts of accelerator, wherein the total mass parts of the nitrile rubber and brominated butyl rubber is 100 parts; the rubber composite vulcanizing agent is at least two of 4,4'-dimorpholine disulfide DTDM, dipentylene thiuram tetrasulfide DPTT, and tetramethylthiuram disulfide TT.

2. The rubber material for motor vibration reduction according to claim 1, characterized in that: The composition comprises the following components in parts by weight: 70 parts of nitrile rubber, 30 parts of brominated butyl rubber, 40-60 parts of reinforcing agent, 20-30 parts of softening agent, 5-10 parts of activating agent, 4-8 parts of antioxidant, 5-20 parts of damping agent, 1.55-1.75 parts of rubber composite vulcanizing agent, 0.5-2 parts of accelerator, wherein the total mass parts of nitrile rubber and brominated butyl rubber is 100 parts.

3. The rubber material for motor vibration reduction according to claim 1, characterized in that: The nitrile rubber is preferably a nitrile rubber having an acrylonitrile content of 36%-42%; the brominated butyl rubber is preferably a brominated butyl rubber having a bromine content of 1.5%-2.5%.

4. The rubber material for motor vibration reduction according to any one of claims 1 to 3, characterized in that: The reinforcing agent is carbon black, and the carbon black is 45 to 55 parts.

5. The rubber material for motor vibration reduction according to claim 4, characterized in that: The carbon black preferably has a DBP oil absorption value of 121 cm3 / 100g.

6. The rubber material for motor vibration reduction according to any one of claims 1 to 3, characterized in that: The softener is dioctyl terephthalate.

7. The rubber material for motor vibration reduction according to claim 1, characterized in that: The damping agent is one or more of C5, C9 petroleum resin, hydrogenated C5 or hydrogenated C9 petroleum resin.

8. The rubber material for motor vibration reduction according to claim 1 or 2, characterized in that: The rubber composite vulcanizing agent is preferably a combination of 4,4'-dimorpholine disulfide DTDM and dipentylene thiuram tetrasulfide DPTT, and the accelerator is preferably 2,2'-dibenzothiazole disulfide DM.

9. The rubber material for motor vibration reduction according to claim 1, characterized in that: The composition comprises the following components in parts by weight: 70 parts of nitrile rubber, 30 parts of brominated butyl rubber, 45 parts of carbon black, 25 parts of dioctyl terephthalate DOTP, 5 parts of zinc oxide, 1.5 parts of antioxidant MB, 2.0 parts of antioxidant 445, 5 parts of C5 resin, 0.8 parts of vulcanizing agent DTDM, 0.75 parts of vulcanizing agent DPTT, and 1 part of accelerator DM.

10. A method for preparing a rubber material for motor vibration reduction, characterized in that: The following steps are involved: Step 1: Add nitrile rubber and bromobutyl rubber into an internal mixer and mix for 60 to 90 seconds; Step 2: Add the reinforcing agent and the damping agent into an internal mixer and mix for 120 to 240 seconds; Step 3: Add the softener into the internal mixer and mix for 180 to 240 seconds; Step 4: Mix the antioxidant in an internal mixer to 135°C; Step 5: Discharge the rubber to the sheet machine for air cooling to obtain the masterbatch, and leave it for more than 2 hours; Step 6: Put the cooled and parked masterbatch into an internal mixer and mix for 30 to 60 seconds; Step 7: Add zinc oxide, composite vulcanizing agent and accelerator into an internal mixer, mix for 40 to 50 seconds, raise and lower the top bolt once, continue mixing until the temperature reaches 80°C, discharge the rubber and cool the sheets to the sheet machine, and obtain the motor damping rubber material.

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