1. A vulcanization composition containing a damping modifier, characterized in that the composition contains the following components stored in admixture or independently:

nitrile butadiene rubber matrix, damping modifier, vulcanizing agent, accelerator, activator, anti-aging agent, plasticizer and reinforcing agent,

wherein the damping modifier is lignin and tackifying resin, and the weight ratio of the lignin to the tackifying resin is 0.2-1.2: 1; the reinforcing agent is a whisker reinforcing agent;

relative to 100 parts by weight of the nitrile rubber matrix, the content of the damping modifier is 20-80 parts by weight, the content of the vulcanizing agent is 0.3-3 parts by weight, the content of the accelerator is 1-5 parts by weight, the content of the activator is 2-10 parts by weight, the content of the anti-aging agent is 0.5-3 parts by weight, the content of the plasticizer is 3-18 parts by weight, and the content of the reinforcing agent is 5-30 parts by weight.

2. The composition according to claim 1, wherein the damping modifier is contained in an amount of 20 to 75 parts by weight, the vulcanizing agent is contained in an amount of 0.5 to 2 parts by weight, the accelerator is contained in an amount of 1 to 4 parts by weight, the activator is contained in an amount of 3 to 8 parts by weight, the anti-aging agent is contained in an amount of 0.5 to 2 parts by weight, the plasticizer is contained in an amount of 3 to 15 parts by weight, and the reinforcing agent is contained in an amount of 5 to 25 parts by weight, relative to 100 parts by weight of the nitrile rubber matrix.

3. The composition of claim 1 or 2, wherein the lignin and the tackifying resin are present in a weight ratio of 0.3-1: 1.

4. The composition according to any one of claims 1 to 3, wherein the nitrile rubber matrix has a content of acrylonitrile structural units of 20 to 41% by weight and a content of 1, 2-butadiene structural units of 5 to 15% by weight;

preferably, ML of said nitrile rubber matrix₍₁₊₄₎40-80 ℃ at 100 ℃.

5. The composition as claimed in any one of claims 1 to 4, wherein the lignin has a phenolic hydroxyl group content of 3.0 wt% or more and a number average molecular weight of 2500-5500;

the lignin is at least one of organic solvent lignin extracted from wood fiber by an organic solvent method, enzymolysis lignin extracted from ethanol prepared by fermentation, Kraft lignin extracted from Kraft pulping black liquor, alkali lignin obtained by paper-making alkali pulping and high-boiling alcohol lignin;

preferably, the tackifying resin is selected from at least one of thermoplastic multi-alkyl phenol-formaldehyde resin, cashew modified phenolic resin, Turkel modified phenolic resin, condensate of tert-butyl phenol and acetylene, thermoplastic non-reactive p-tert-octyl phenolic resin, thermoplastic alkyl phenolic resin and o-cresol novolac epoxy resin;

preferably, the reinforcing agent is selected from at least one of calcium sulfate whiskers, gypsum whiskers, calcium carbonate whiskers, magnesium sulfate whiskers, magnesium carbonate whiskers, magnesium hydroxide whiskers, aluminum borate whiskers, magnesium borate whiskers, potassium titanate whiskers, calcium silicate whiskers, and mullite whiskers.

6. The composition according to any one of claims 1-4, wherein the vulcanizing agent is selected from at least one of sulfur donors;

preferably, the accelerator is selected from at least one of thiazole accelerators, thiuram accelerators, guanidine accelerators and sulfenamide accelerators, preferably the accelerator is tetramethylthiuram disulfide and/or N-cyclohexyl-2-benzothiazyl sulfenamide;

preferably, the activator is a mixture of a metal oxide and a fatty acid; the metal oxide is preferably zinc oxide and/or magnesium oxide; the fatty acid is preferably stearic acid;

preferably, the anti-aging agent is selected from at least one of quinoline anti-aging agents, amine anti-aging agents and benzimidazole anti-aging agents;

preferably, the plasticizer is selected from at least one of dioctyl phthalate, dibutyl phthalate, dioctyl sebacate, dibutyl sebacate, aromatic oil, paraffin oil, naphthene oil and epoxidized soybean oil.

7. A process for the preparation of a vulcanized rubber, which comprises mixing the components of the composition as claimed in any one of claims 1 to 6 and vulcanizing the final rubber obtained after mixing; in the composition, relative to 100 parts by weight of a nitrile rubber matrix, the dosage of a damping modifier is 20-80 parts by weight, the dosage of a reinforcing agent is 5-30 parts by weight, the dosage of a vulcanizing agent is 0.3-3 parts by weight, the dosage of an accelerator is 1-5 parts by weight, the dosage of an activator is 2-10 parts by weight, the dosage of an anti-aging agent is 0.5-3 parts by weight, and the dosage of a plasticizer is 3-18 parts by weight.

8. The method of claim 7, wherein mixing the components of the composition and curing the final mix after mixing comprises:

(1) carrying out first mixing on each component in the component A containing the nitrile rubber matrix and the damping modifier to obtain a section of master batch;

(2) carrying out second mixing on the first-stage masterbatch and each component in the component B containing the reinforcing agent, the activator, the anti-aging agent and the plasticizer to obtain second-stage masterbatch;

(3) carrying out third mixing on the second-stage masterbatch and each component in the component C containing a vulcanizing agent and an accelerator to obtain a final rubber;

(4) vulcanizing the final rubber;

the rubber material comprises a nitrile rubber matrix, a damping modifier, a reinforcing agent, a vulcanizing agent, an accelerator, an activator, an anti-aging agent and a plasticizer, wherein the amount of the damping modifier is 20-75 parts by weight, the amount of the reinforcing agent is 5-25 parts by weight, the amount of the vulcanizing agent is 0.5-2 parts by weight, the amount of the accelerator is 1-4 parts by weight, the amount of the activator is 3-8 parts by weight, the amount of the anti-aging agent is 0.5-2 parts by weight and the amount of the plasticizer is 3-15 parts by weight relative to 100 parts by weight of the nitrile rubber matrix.

9. The method of claim 7 or 8, wherein the conditions of the first mixing comprise: the temperature is 90-160 deg.C, and the time is 10-35 min;

preferably, the conditions of the second mixing include: the temperature is 100-170 ℃, and the time is 3-12 min;

preferably, the conditions of the third mixing include: the temperature is not more than 130 ℃, and the time is 5-7 min;

preferably, the conditions of the vulcanization include: the temperature is 150 ℃ and 170 ℃, the pressure is 10-20MPa, and the time is 15-35 min.

10. A vulcanized rubber produced by the method of any one of claims 7 to 9.

11. Use of the vulcanizate of claim 10 as a damping material.

Background

With the improvement of science and technology and the improvement of living standard, the requirement of people on comfort is higher and higher, so that the effective treatment of various vibration and noise pollution becomes an important research subject. The rubber elastomer material is used as a damping material and is widely applied to vibration reduction and noise reduction in the fields of rail transit, buildings, automobiles, machinery and the like.

The molecular chain segment of the rubber has strong relaxation capacity and generates strong internal friction, but when the rubber elastic body absorbs vibration energy, the mechanical energy is partially converted into heat energy to be dissipated, and the damping effect is achieved. However, the requirement of industry and daily life is difficult to meet only by the damping performance of the material itself, so that the focus of the research on developing a wide temperature range high-damping material is the focus of the present research.

Recently, hybrid bodies formed by small organic molecules and polymers are utilized to obtain high-performance damping materials, and the wide interest of researchers is aroused.

CN106543739A discloses a hindered phenol/montmorillonite/nitrile rubber composite damping material for automobiles and a preparation method thereof, the technology utilizes fillers such as montmorillonite and cork fiber to design the damping material, but relates to the use of various organic solvents such as dimethylbenzene and sodium hypophosphite hydroxide, and the process is relatively complex.

CN107337814A discloses a high damping rubber material containing lignin fiber/flake filler and hindered phenol/amine and a preparation method thereof, which can block the migration of small molecules to some extent, but the dispersion of the flake filler in the composition is still an important problem, and the modification and intercalation treatment processes of the coupling agent are complicated, and require high requirements for control means, and are not favorable for large-scale application. In addition, small molecule migration in the damping rubber can cause reduction of mechanical properties in the long-term use process.

Therefore, the prior art can not completely solve the problem of damping and mechanical property reduction caused by outward migration of hindered phenol, and a rubber composition with improved properties is needed to prepare the nitrile rubber damping material with high damping and wide temperature range.

Disclosure of Invention

The invention aims to overcome the defect that the prior art cannot completely solve the problem of damping and mechanical property reduction caused by outward migration of hindered phenol.

In order to achieve the above object, one aspect of the present invention provides a vulcanized composition containing a damping modifier, which comprises the following components stored in admixture or separately:

nitrile butadiene rubber matrix, damping modifier, vulcanizing agent, accelerator, activator, anti-aging agent, plasticizer and reinforcing agent,

wherein the damping modifier is lignin and tackifying resin, and the weight ratio of the lignin to the tackifying resin is 0.2-1.2: 1; the reinforcing agent is a whisker reinforcing agent;

relative to 100 parts by weight of the nitrile rubber matrix, the content of the damping modifier is 20-80 parts by weight, the content of the vulcanizing agent is 0.3-3 parts by weight, the content of the accelerator is 1-5 parts by weight, the content of the activator is 2-10 parts by weight, the content of the anti-aging agent is 0.5-3 parts by weight, the content of the plasticizer is 3-18 parts by weight, and the content of the reinforcing agent is 5-30 parts by weight.

In a second aspect, the present invention provides a process for producing a vulcanized rubber, which comprises mixing the components of the composition described in the first aspect, and vulcanizing the final rubber obtained after mixing; in the composition, relative to 100 parts by weight of a nitrile rubber matrix, the dosage of a damping modifier is 20-80 parts by weight, the dosage of a reinforcing agent is 5-30 parts by weight, the dosage of a vulcanizing agent is 0.3-3 parts by weight, the dosage of an accelerator is 1-5 parts by weight, the dosage of an activator is 2-10 parts by weight, the dosage of an anti-aging agent is 0.5-3 parts by weight, and the dosage of a plasticizer is 3-18 parts by weight.

A third aspect of the present invention provides a vulcanizate prepared by the method of the second aspect described above.

A fourth aspect of the present invention provides the use of the vulcanized rubber described in the aforementioned third aspect as a damping material.

The composition provided by the invention can obtain vulcanized rubber with high damping wide-temperature range characteristics, low hysteresis, excellent processing formability and good mechanical properties through the synergistic action of the effective components, and can be further used as a damping rubber material.

Detailed Description

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.

As previously mentioned, a first aspect of the present invention provides a vulcanising composition comprising a damping modifier, which composition comprises the following components stored either in admixture or separately:

nitrile butadiene rubber matrix, damping modifier, vulcanizing agent, accelerator, activator, anti-aging agent, plasticizer and reinforcing agent,

wherein the damping modifier is lignin and tackifying resin, and the weight ratio of the lignin to the tackifying resin is 0.2-1.2: 1; the reinforcing agent is a whisker reinforcing agent;

relative to 100 parts by weight of the nitrile rubber matrix, the content of the damping modifier is 20-80 parts by weight, the content of the vulcanizing agent is 0.3-3 parts by weight, the content of the accelerator is 1-5 parts by weight, the content of the activator is 2-10 parts by weight, the content of the anti-aging agent is 0.5-3 parts by weight, the content of the plasticizer is 3-18 parts by weight, and the content of the reinforcing agent is 5-30 parts by weight.

According to the present invention, the inventors have found that, although the respective components such as the damping modifier and the reinforcing agent are within the above-mentioned content ranges, a composition capable of achieving the object of the present invention can be obtained, it is preferable that the damping modifier is contained in an amount of 20 to 75 parts by weight, the vulcanizing agent is contained in an amount of 0.5 to 2 parts by weight, the accelerator is contained in an amount of 1 to 4 parts by weight, the activator is contained in an amount of 3 to 8 parts by weight, the antioxidant is contained in an amount of 0.5 to 2 parts by weight, the plasticizer is contained in an amount of 3 to 15 parts by weight, and the reinforcing agent is contained in an amount of 5 to 25 parts by weight, with respect to 100 parts by weight of the nitrile rubber matrix, in order to obtain a vulcanized rubber having more excellent mechanical properties, damping properties and processability.

In order to make the vulcanized rubber of the invention have more excellent high-damping wide-temperature-range characteristics, low hysteresis, excellent processability and good mechanical properties, it is preferable that the content weight ratio of the lignin and the tackifying resin is further limited to 0.3-1:1 on the basis of the embodiment of the invention.

Preferably, the content of acrylonitrile structural units is 20 to 41 wt% and the content of 1, 2-butadiene structural units is 5 to 15 wt% in the nitrile rubber matrix.

Preferably, the nitrile rubberML of a gel matrix₍₁₊₄₎40-80 ℃ at 100 ℃.

Preferably, the lignin has a phenolic hydroxyl group content of 3.0 wt% or more and a number average molecular weight of 2500-5500.

More preferably, the lignin is at least one selected from the group consisting of organosolv lignin extracted from wood fibers by organosolv process, enzymatic lignin extracted from ethanol by fermentation, Kraft lignin extracted from Kraft black liquor, alkali lignin obtained from alkaline pulping in paper making, and high boiling alcohol lignin.

Preferably, the lignin content in the organosolv lignin, the enzymolytic lignin and the alkali lignin is respectively and independently more than or equal to 70 wt%.

Preferably, the tackifying resin is selected from at least one of thermoplastic polyalkylphenol-formaldehyde resin, cashew modified phenol-formaldehyde resin, Turkel modified phenol-formaldehyde resin, condensate of tert-butylphenol and acetylene (e.g. condensate Koresin of butylphenol and acetylene), thermoplastic non-reactive p-tert-octylphenol-formaldehyde resin, thermoplastic alkyl phenol-formaldehyde resin, and o-cresol novolac epoxy resin.

Preferably, the reinforcing agent is selected from at least one of calcium sulfate whiskers, gypsum whiskers, calcium carbonate whiskers, magnesium sulfate whiskers, magnesium carbonate whiskers, magnesium hydroxide whiskers, aluminum borate whiskers, magnesium borate whiskers, potassium titanate whiskers, calcium silicate whiskers, and mullite whiskers.

In the present invention, there is no particular limitation on the parameters of the reinforcing agent, such as length, diameter, aspect ratio, and bulk density, and they may be conventionally selected in the art.

Preferably, the vulcanizing agent is selected from at least one of sulfur donors.

In the present invention, the sulfur donor refers to a substance capable of providing sulfur. The sulfur comprises at least one of insoluble sulfur, soluble sulfur and oil-extended sulfur. For example, the vulcanizing agent IS ordinary sulfur S, oil-extended insoluble sulfur IS, or the like.

Preferably, the accelerator is selected from at least one of thiazole accelerators, thiuram accelerators, guanidine accelerators and sulfenamide accelerators; further preferably, the accelerator is tetramethylthiuram disulfide (TMTD) and/or N-cyclohexyl-2-benzothiazolesulfenamide (CZ).

Preferably, the activator is a mixture of a metal oxide and a fatty acid. Wherein the metal oxide is preferably zinc oxide and/or magnesium oxide; the fatty acid is preferably stearic acid.

Preferably, the anti-aging agent is at least one selected from quinoline anti-aging agents, amine anti-aging agents and benzimidazole anti-aging agents, for example, the anti-aging agent is anti-aging agent 4020.

Preferably, the plasticizer is selected from at least one of dioctyl phthalate (DOP), dibutyl phthalate, dioctyl sebacate, dibutyl sebacate, aromatic oils, paraffinic oils, naphthenic oils, and epoxidized soybean oils, for example, the naphthenic oils are ASTM103# oils.

The composition provided by the invention can obtain vulcanized rubber with low hysteresis, excellent processing formability and good mechanical property through the synergistic action of the effective components.

As described above, the second aspect of the present invention provides a process for producing a vulcanized rubber, which comprises kneading the components of the composition described in the first aspect, and vulcanizing the final rubber obtained after the kneading; in the composition, relative to 100 parts by weight of a nitrile rubber matrix, the dosage of a damping modifier is 20-80 parts by weight, the dosage of a reinforcing agent is 5-30 parts by weight, the dosage of a vulcanizing agent is 0.3-3 parts by weight, the dosage of an accelerator is 1-5 parts by weight, the dosage of an activator is 2-10 parts by weight, the dosage of an anti-aging agent is 0.5-3 parts by weight, and the dosage of a plasticizer is 3-18 parts by weight.

The various components of the composition according to the second aspect of the invention have the same properties as the corresponding same substances according to the first aspect of the invention, and in order to avoid repetition, the properties of the substances according to the second aspect of the invention, including the optional nature of the components, etc., will not be repeated, and the person skilled in the art will not be understood as a limitation of the second aspect of the invention.

In order to provide the vulcanized rubber of the present invention with more excellent high damping wide temperature range characteristics, low hysteresis, excellent processability and good mechanical properties, according to a preferred embodiment, the operations of mixing the components of the composition and vulcanizing the final rubber obtained after mixing comprise:

(1) carrying out first mixing on each component in the component A containing the nitrile rubber matrix and the damping modifier to obtain a section of master batch;

(2) carrying out second mixing on the first-stage masterbatch and each component in the component B containing the reinforcing agent, the activator, the anti-aging agent and the plasticizer to obtain second-stage masterbatch;

(3) carrying out third mixing on the second-stage masterbatch and each component in the component C containing a vulcanizing agent and an accelerator to obtain a final rubber;

(4) vulcanizing the final rubber;

the rubber material comprises a nitrile rubber matrix, a damping modifier, a reinforcing agent, a vulcanizing agent, an accelerator, an activator, an anti-aging agent and a plasticizer, wherein the amount of the damping modifier is 20-75 parts by weight, the amount of the reinforcing agent is 5-25 parts by weight, the amount of the vulcanizing agent is 0.5-2 parts by weight, the amount of the accelerator is 1-4 parts by weight, the amount of the activator is 3-8 parts by weight, the amount of the anti-aging agent is 0.5-2 parts by weight and the amount of the plasticizer is 3-15 parts by weight relative to 100 parts by weight of the nitrile rubber matrix.

According to the method of the second aspect of the present invention, preferably, in step (1), the conditions of the first mixing include: the temperature is 90-160 deg.C, and the time is 10-35 min.

According to the method of the second aspect of the present invention, preferably, in the step (2), the conditions of the second mixing include: the temperature is 100 ℃ and 170 ℃, and the time is 3-12 min.

According to the method of the second aspect of the present invention, preferably, in step (3), the conditions of the third mixing include: the temperature is not more than 130 deg.C, and the time is 5-7 min.

According to the method of the second aspect of the present invention, preferably, in the step (4), the vulcanization conditions include: the temperature is 150 ℃ and 170 ℃, the pressure is 10-20MPa, and the time is 15-35 min.

The pressures used in the present invention are gauge pressures unless otherwise specified.

According to the method provided by the second aspect of the invention, the component A containing the nitrile rubber matrix and the damping modifier is subjected to first mixing to obtain a section of master batch, and then the subsequent process steps are carried out, so that the mechanical property and the dynamic mechanical property of the obtained vulcanized rubber are more excellent.

To specifically illustrate the process for preparing a vulcanized rubber according to the second aspect of the present invention, a preferred embodiment is provided below for illustration:

(1) placing a nitrile rubber substrate in an internal mixer, plasticating at the rotation speed of 40-90 rpm, the initial mixing temperature of 75-100 ℃ and the raw rubber plasticating time of 0.3-1 min; then introducing a damping modifier into the internal mixer for first mixing to obtain a section of master batch;

(2) adding the primary masterbatch and a component B containing a reinforcing agent, an activator, an anti-aging agent and a plasticizer into an internal mixer for secondary mixing, discharging and standing for 3-10 hours to obtain secondary masterbatch;

(3) setting the rotation speed of an internal mixer to be 50-100 rpm, setting the initial mixing temperature to be 25-50 ℃, plasticating the two-stage masterbatch for 0.5-1.5 min, and adding a component C containing an accelerator and a vulcanizing agent to carry out third mixing to obtain final rubber;

(4) and (3) tabletting and cutting the final rubber compound open mill, and then putting the final rubber compound open mill into a flat vulcanizing machine for vulcanization.

In step (3) of the above preferred embodiment, mastication is not essential, but is only required to obtain a better processing effect.

As previously mentioned, a third aspect of the present invention provides a vulcanizate prepared by the method of the second aspect described above.

As mentioned above, a fourth aspect of the present invention provides the use of the vulcanized rubber of the third aspect as described above as a damping material.

The present invention will be described in detail below by way of examples.

The following examples and comparative examples various commercial products used below were commercially available without specific description.

Nitrile rubber matrix: 2665 the content of acrylonitrile structural unit is 30.4 wt%, the content of 1, 2-butadiene structural unit is 8.3 wt%, ML₍₁₊₄₎64 at 100 ℃ from Russian Brookfield;

nitrile rubber matrix: 3305E, acrylonitrile structural unit content 35.0 wt%, 1, 2-butadiene structural unit content 6.6 wt%, ML₍₁₊₄₎56 ℃ at 100 ℃, Middling Petroleum Lanzhou petrochemical division;

damping modifier: enzymolysis lignin, which is in the form of powder, the lignin content is more than or equal to 80 wt%, the number average molecular weight is 3850, the phenolic hydroxyl content is more than or equal to 3.0 wt%, and the lignin is produced by Shandong Longli Biotech Co., Ltd; solvent lignin is selected from bamboo brown powder, the lignin content is more than or equal to 85 wt%, the number average molecular weight is 3719, the phenolic hydroxyl group content is more than or equal to 3.0 wt%, Guangzhou, cortex albiziae and Sancheng Biotech limited;

damping modifier: tackifying resins, Koresin, a condensate of butyl phenol and acetylene, yellow or brown granules and powders, with a density (20 ℃) of 1.02 to 1.04g/cm³BASF, germany; HY-2006 tackifying resin, thermoplastic multi-alkyl phenol-formaldehyde resin, dark brown granular or flaky, softening point of 120-;

reinforcing agent: the calcium sulfate whisker is uniform and fibrous, has the average length of 10-100 mu m, the average diameter of 2-5 mu m, the average length-diameter ratio of 20-50 and the bulk density of 0.1-0.6 g/cm³Jiangsu New resources mining, Limited liability company;

reinforcing agent: magnesium sulfate whisker, needle-shaped fiber and white powder, the average length is 3.5-120 mu m, the average diameter is 0.5-2 mu m, the average length-diameter ratio is 8-70, and the bulk density is 0.1-0.3 g/cm³Jiangxi Feng Zhu New Material science and technology Co., Ltd;

reinforcing agent: carbon black N660(CTAB adsorption specific surface area 31-43 m)²(g), Jiangxi black cat carbon black, Inc.;

plasticizer: ASTM103# oil, ningbo co-evolution chemical ltd; paraffin oil, Shandongten chemical Co., Ltd;

activating agent: zinc oxide, stearic acid, Weifang Heng Feng chemical Limited;

an anti-aging agent: n- (1, 3-dimethylbutyl) -N' -phenyl-p-phenylenediamine (4020) Jiangsu san Oao chemical science, Inc.;

vulcanizing agent: sulfur, Heicheng Hechenghuai chemical Limited;

accelerator (b): tetramethylthiuram Disulfide (TMTD) and N-cyclohexyl-2-benzothiazolesulfenamide (CZ), Zodiac chemical Limited, Guangzhou.

The following examples and comparative examples the equipment for the preparation of vulcanizates are shown in Table 1.

The apparatus for testing the vulcanizates prepared in the following examples and comparative examples is shown in Table 2.

The test conditions for the vulcanizates prepared in the following examples and comparative examples are shown in Table 3.

The amounts of the components used in the following examples and comparative examples are in parts by weight, and each part (i.e., each part by weight) represents 10 g.

TABLE 1

Serial number	Device name	Model number	Manufacturer of the product
				1	Internal mixer	BR1600	Farrel America Ltd
2	Open mill	XK-160	QINGDAO XINCHENG YIMING RUBBER MACHINERY Co.,Ltd.
				3	Flat vulcanizing machine	P-50-PCD-3L 400×400\50T	Taiwan rock Hydraulic Industrial Co Ltd

TABLE 2

Serial number	Test items	Model of the test apparatus	Manufacturer of the product
				1	Tensile strength	GT-AT-3000	Taiwan high speed railway Co
2	Dynamic viscoelastic property	EPLEXOR500N	Germany GABO Co

TABLE 3

Example 1

The formulations of the vulcanized compositions are shown in Table 4;

the preparation process of the vulcanized rubber is as follows:

(1) carrying out first mixing on a rubber matrix and a damping modifier to obtain a section of master batch; specifically, nitrile rubber is added into an internal mixer, the set rotating speed is 80rpm, the initial mixing temperature is 100 ℃, and the raw rubber plastication time is 0.5 min; adding a damping modifier into the internal mixer for first mixing at 145 ℃ for 30min to obtain a section of master batch;

(2) secondly, mixing the primary masterbatch with a reinforcing agent, an activator, an anti-aging agent and a plasticizer to obtain secondary masterbatch; specifically, adding a reinforcing agent, a plasticizer, an activator and an anti-aging agent into an internal mixer, and carrying out second mixing with the primary masterbatch for 6min at the rubber discharge temperature of 110 ℃, discharging and standing for 4h to obtain secondary masterbatch;

(3) carrying out third mixing on the second-stage masterbatch, an accelerant and a vulcanizing agent to obtain final rubber; specifically, setting the rotation speed of an internal mixer to be 80rpm, setting the initial mixing temperature to be 40 ℃, plasticating the two-stage masterbatch for 1min, adding a vulcanizing agent and an accelerator to perform third mixing, setting the mixing temperature to be 105 ℃, mixing for 5min, and discharging to obtain final mixed rubber;

(4) and (3) tabletting and cutting the final rubber mixing open mill, and then putting the final rubber mixing open mill into a flat plate vulcanizing machine for vulcanizing at the vulcanizing temperature of 150 ℃, the vulcanizing pressure of 15MPa and the vulcanizing time of 30min to obtain a vulcanized rubber sample, which is recorded as S1.

Example 8

The formulation of the composition of this example is exactly the same as in example 1.

The preparation process of the vulcanized rubber is as follows:

carrying out first mixing on a nitrile butadiene rubber matrix, a damping modifier, a whisker reinforcing agent, a plasticizer, an anti-aging agent and an activating agent to obtain a section of masterbatch; specifically, nitrile rubber is added into an internal mixer, the set rotating speed is 80rpm, the initial mixing temperature is 100 ℃, and the raw rubber plastication time is 0.5 min; adding a damping modifier, a whisker reinforcing agent, a plasticizer, an anti-aging agent and an activating agent into an internal mixer for first mixing for 36min at the mixing temperature of 110 ℃, discharging and standing for 4h to obtain master batch;

carrying out second mixing on the obtained primary rubber, an accelerator and a vulcanizing agent to obtain final rubber; specifically, setting the rotating speed of an internal mixer to be 80rpm, setting the initial mixing temperature to be 40 ℃, mixing the primary rubber compound for 1min, adding a vulcanizing agent and an accelerator for secondary mixing, setting the mixing temperature to be 105 ℃, mixing for 5min, and discharging to obtain final rubber compound;

and (3) tabletting and cutting the final rubber mixing open mill, and then putting the final rubber mixing open mill into a flat plate vulcanizing machine for vulcanizing at the vulcanizing temperature of 150 ℃, the vulcanizing pressure of 15MPa and the vulcanizing time of 30min to obtain a vulcanized rubber sample, which is recorded as S8.

The remaining examples were carried out using the same procedure as in example 1, except that the formulation of the curing composition and the process parameters used were different, without specific mention, in table 4.

Comparative example was carried out using a similar procedure to example 1, except that the formulation and the process parameters of the vulcanized composition were different, see in particular table 4.

TABLE 4

Table 4 (continuation watch)

Table 4 (continuation watch)

Test example

The rubber products obtained in the examples and comparative examples were respectively tested for tensile strength and dynamic viscoelasticity, and the results are shown in Table 5.

TABLE 5

	Tensile Strength (MPa)	Maximum loss factor corresponding to temperature (. degree. C.)	Temperature range with loss factor > 0.5
				Example 1	22.3	-8.1	-18.6～12.6
Example 2	20.8	-8.5	-17.2～13.0
				Example 3	21.3	-9.5	-19.3～11.2
Example 4	20.5	-8.7	-18.4～12.3
				Example 5	17.2	-6.1	-16.3～14.4
Example 6	19.1	-10.2	-20.6～8.8
				Example 7	19.6	-10.3	-20.3～9.5
Example 8	17.0	-10.5	-22.1～7.0
				Comparative example 1	12.7	-19.6	-28.7～-5.7
Comparative example 2	14.8	-12.2	-24.8～4.1
				Comparative example 3	16.3	-15.4	-27.1～1.5
Comparative example 4	13.2	-14.8	-23.1～6.2
				Comparative example 5	13.7	-10.9	-20.6～8.9
Comparative example 6	16.8	-14.2	-22.9～7.1
				Comparative example 7	13.5	-13.0	-25.4～5.7

As can be seen from the results in Table 5, the components in the rubber composition provided by the invention can be well dispersed in the rubber matrix, so that the further prepared vulcanized rubber has excellent comprehensive properties such as high strength, high damping temperature range, high damping factor and the like.

The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.