1. An IRM903 oil medium-low pressure change nitrile rubber material is characterized in that: comprises the following components in percentage by weight:

2. the IRM903 oil medium-low pressure variable nitrile rubber material according to claim 1, wherein: the Mooney viscosity ML (1+4) of the high-Mooney nitrile raw rubber 3370C is 100 ℃: 70.

3. the IRM903 oil medium-low pressure variable nitrile rubber material according to claim 2, wherein: the weight percentage of the high-Mooney nitrile raw rubber 3370C is 49.5%.

4. The IRM903 oil medium-low pressure variable nitrile rubber material as claimed in claim 1, wherein: the carbon black N774 semi-reinforcing carbon black and the ST1120 carbon black are used together, and the weight percentage of the carbon black is 10.5 percent and 28.0 percent respectively.

5. The IRM903 oil medium-low pressure variable nitrile rubber material according to any one of claims 1 to 4, wherein: the peroxide curing agent PERKADOXA 14 and the peroxide crosslinking assistant ChemimixPMA-201 are used together, and the weight percentage of the components is 2.0 percent.

6. A preparation method of an IRM903 oil medium-low pressure variable nitrile rubber material is characterized by comprising the following steps: the material composition as claimed in any one of claims 1 to 5, wherein the preparation comprises mixing a master batch: adding the material components into an internal mixer for mixing uniformly, and discharging rubber when the mixing temperature reaches 125-135 ℃; and (3) vulcanization: filling the molded rubber material into a mold cavity, vulcanizing the rubber material on a vulcanizing machine at 170-175 ℃ for 6min to obtain a first-stage vulcanized product, and performing secondary treatment at 150 ℃ for 120min to finally obtain the low-pressure variable nitrile rubber sealing product in IRM903 oil.

7. The preparation method of the IRM903 oil medium-low pressure variable nitrile rubber material according to claim 6, wherein the method comprises the following steps: adding all components except the peroxide vulcanizing agent PERKADOXA 14 and the crosslinking assistant PMA-201 into an internal mixer, uniformly mixing, standing the master batch mixed in the step (1) for 8 hours, adding the master batch into the internal mixer, adding the peroxide vulcanizing agent PERKADOXA 14 and the crosslinking assistant ChemimixPMA-201 at the moment, controlling the temperature of the internal mixer to be 110-120 ℃, mixing the rubber material for 2.0-3.0 minutes, and then discharging the rubber.

Background

With the increasing demand of the automobile market, the usage amount of the rubber sealing element for the automobile is larger and larger, the rubber sealing element is an indispensable important component in the automobile, the requirement on the rubber sealing material is higher and higher nowadays in the continuous updating and upgrading of the automobile, and the rubber sealing element for the engine filter which is produced by the Cummins group is one of the key components.

As is known, the IRM903# oil is a high-viscosity petroleum-based standard oil product, the aniline point of the oil is the lowest among standard test oils IRM901#, IRM902#, and IRM903#, the swelling capacity of the oil is the highest, the oil is a high-volume extending oil, and the volume of the nitrile rubber in the IRM903# oil is increased greatly, so that high swelling can occur. The nitrile rubber material can meet the standard of SAE J200M2CH714A25EO15EO35F16 material, but simultaneously needs to meet the technical index that the B-type compression permanent deformation is less than or equal to 10% after being soaked in IRM903 oil at 125 ℃ for 70h, which is the difficult problem that the invention needs to overcome, and the prior art generally has the problem that the compression permanent deformation of the nitrile rubber material is more than or equal to 20% because of higher swelling after being soaked in IRM903# oil at 125 ℃ for 70h, which can not meet the requirement and the difficulty can be known.

How to design a medium-low pressure variable nitrile rubber material in IRM903 oil, through reasonable setting of raw material component ratio, the material not only meets the material standard of SAE J200M2CH714A25EO15EO35F16, but also can meet the technical index requirement that the B-type compression permanent deformation is less than or equal to 10% after being soaked in IRM903 oil at 125 ℃ for 70h, and the technical problem to be solved in the prior art is urgent.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to provide a medium-low pressure variable nitrile rubber material in IRM903 oil and a preparation method thereof, wherein the medium-low pressure variable nitrile rubber material not only meets the material standard of SAE J200M2CH714A25EO15EO35F16, but also meets the technical index that after the material is soaked in IRM903 oil at 125 ℃ for 70h, the B-type compression permanent deformation is less than or equal to 10 percent.

According to the preparation method of the IRM903 oil medium-low pressure variable nitrile rubber material, a two-stage mixing method is adopted, the problem that rubber materials are easy to scorch due to one-stage mixing and vulcanizing can be solved, meanwhile, the nitrile rubber and various compounding agents can be fully infiltrated by placing, a synergistic effect is generated by intermolecular combination, the mixed rubber is dispersed more uniformly, and the rubber material performance is more stable.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the invention relates to an IRM903 oil medium-low pressure variable nitrile rubber material, which comprises the following components in percentage by weight:

as a further improvement of the invention, the Mooney viscosity ML (1+4) of the high Mooney nitrile raw rubber 3370C is 100 ℃: 70.

as a further improvement of the invention, the weight percentage of the high-Mooney nitrile butadiene rubber 3370C is 49.5%.

As a further improvement of the invention, the carbon black N774 semi-reinforcing carbon black and the ST1120 carbon black are used together, and the weight percentages of the carbon black N774 semi-reinforcing carbon black and the ST1120 carbon black are respectively 10.5% and 28.0%.

As a further improvement of the invention, the peroxide curing agent PERKADOXA 14 and the peroxide crosslinking assistant ChemimixPMA-201 are used together, and the weight percentages of the components are 2.0%.

The invention relates to a preparation method of an IRM903 oil medium-low pressure variable nitrile rubber material, which is characterized by comprising the following steps: the material composition of any one of claims 1 to 4, wherein the material composition is prepared by mixing a master batch: adding the material components into an internal mixer for mixing uniformly, and discharging rubber when the mixing temperature reaches 125-135 ℃; and (3) vulcanization: filling the molded rubber material into a mold cavity, vulcanizing the rubber material on a vulcanizing machine at 170-175 ℃ for 6min to obtain a first-stage vulcanized product, and performing secondary treatment at 150 ℃ for 120min to finally obtain the low-pressure variable nitrile rubber sealing product in IRM903 oil.

As a further improvement of the invention, all the components except the peroxide curing agent PERKADOXA 14 and the crosslinking assistant PMA-201 in the raw materials are added into an internal mixer for uniform mixing, the master batch after mixing in the step (1) is placed for 8 hours, then the master batch is put into the internal mixer, at the moment, the peroxide curing agent PERKADOXA 14 and the crosslinking assistant ChemimixPMA-201 are added, the temperature of the internal mixer is controlled at 110-120 ℃, the rubber material is mixed for 2.0-3.0 minutes, and then the rubber is discharged.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:

(1) the invention relates to an IRM903 oil medium-low pressure variable nitrile rubber material, which adopts high Mooney nitrile raw rubber 3370C in the formula, wherein the Mooney viscosity ML (1+4) of the raw rubber is 100 ℃: 70, it is better than butyronitrile raw rubber of the conventional Mooney viscosity, but its molecular weight is high, the plasticity is low at the same time, cause the mobility bad because of the large friction among the molecules in the course of mixing, every component is mixed unevenly, other component need good dispersibility and fluidity at this moment, need use the carbon black with particle size under 60nm to improve the mobility of the sizing material, the carbon black in this particle size range will cause the intensity of the filling system to be bad generally, the reinforcement filling system of the invention uses the soft N774 semi-reinforcing carbon black and medium particle size ST1120 carbon black of particle size under 95nm to use the method, wherein N774 semi-reinforcing carbon black not merely meets the strength requirement of the material, the compression resilience is good at the same time, and the particle size ST1120 carbon black in the filling, not only have certain reinforcing effect, and under the same situation of filling amount of carbon black, its hardness rise is small, therefore, the swelling of the rubber compound in the IRM903 oil can be reduced by a certain amount of filling, and the rubber compound also has the characteristic of good compression resilience, and the invention ensures the low-pressure change of the rubber compound in the oil through the synergistic effect of the rubber compound and the high-Mooney nitrile rubber.

(2) According to the IRM903 oil medium-low pressure variable nitrile rubber material, the method of combining the peroxide vulcanizing agent PERKADOXA 14 and the peroxide crosslinking assistant ChemimixPMA-201 is adopted, so that the effect of the peroxide vulcanizing agent can be effectively exerted, the formation of small molecules is reduced, the crosslinking bond of vulcanized rubber is firmer, the crosslinking density of rubber materials is improved, the swelling resistance of the material in IRM903 oil is improved, and the low pressure change requirement is met.

(3) The invention relates to an IRM903 oil medium-low pressure variable nitrile rubber material, which not only meets the SAE J200M2CH714A25EO15EO35F16 material standard, but also meets the technical index that after the material is soaked in IRM903 oil at 125 ℃ for 70h, the B-type compression permanent deformation is less than or equal to 10 percent, and the prepared product can be applied to rubber sealing elements for various automobile engine filters, and also can be applied to IRM903 oil medium-low pressure variable nitrile rubber products for other engineering equipment.

(4) According to the preparation method of the IRM903 oil medium-low pressure variable nitrile rubber material, a two-stage mixing method is adopted, the problem that rubber materials are easy to scorch due to one-stage mixing and vulcanizing can be solved, meanwhile, the nitrile rubber and various compounding agents can be fully infiltrated by placing, a synergistic effect is generated by intermolecular combination, the mixed rubber is dispersed more uniformly, and the rubber material performance is more stable.

Detailed Description

For a further understanding of the contents of the present invention, reference will now be made in detail to the following examples.

Example 1

The IRM903 oil medium-low pressure variable nitrile rubber material comprises the following components in percentage by weight:

TABLE 1 EXAMPLE 1 Components and percent amounts of Low pressure variable nitrile rubber materials in IRM903 oil

Specifically, in this example, the high mooney nitrile rubber 3370C in this example was produced by alnannoc high performance elastomer (changzhou) limited. As an embodiment, the Mooney viscosity ML (1+4) of the high Mooney nitrile raw rubber 3370C in this example is 100 ℃: 70. preferably, the weight percentage of the high mooney raw nitrile rubber 3370C in the embodiment is 49.5%. In the present embodiment, high Mooney nitrile-butadiene raw rubber 3370C is adopted in the formulation, wherein the Mooney viscosity ML (1+4) of the raw rubber is 100 ℃: 70 which has better compression set properties than conventional Mooney nitrile rubber.

In addition, the carbon black N774 semi-reinforcing carbon black and the ST1120 carbon black are used in combination in the present example, and the weight percentages thereof are 10.5% and 28.0%, respectively. The carbon black N774 semi-reinforcing carbon black in this embodiment is produced by Suzhou Baohua carbon black Co., Ltd, and the ST1120 carbon black is produced by Kabot carbon black Co., Ltd.

It is worth noting that high Mooney nitrile butadiene rubber 3370C is used in the formulation, the Mooney viscosity ML (1+4) of the rubber is 100 ℃: 70, it is better than butyronitrile raw rubber of the conventional Mooney viscosity, but its molecular weight is high, the plasticity is low at the same time, cause the mobility bad because of the large friction among the molecules in the course of mixing, every component is mixed unevenly, other component need good dispersibility and fluidity at this moment, need use the carbon black with particle size under 60nm to improve the mobility of the sizing material, the carbon black in this particle size range will cause the intensity of the filling system to be bad generally, the reinforcement filling system of the invention uses the soft N774 semi-reinforcing carbon black and medium particle size ST1120 carbon black of particle size under 95nm to use the method, wherein N774 semi-reinforcing carbon black not merely meets the strength requirement of the material, the compression resilience is good at the same time, and the particle size ST1120 carbon black in the filling, not only have certain reinforcing effect, and under the same situation of filling amount of carbon black, its hardness rise is small, therefore, the swelling of the rubber compound in the IRM903 oil can be reduced by a certain amount of filling, and the rubber compound also has the characteristic of good compression resilience, and the invention ensures the low-pressure change of the rubber compound in the oil through the synergistic effect of the rubber compound and the high-Mooney nitrile rubber.

The reinforcing filling system adopts a method of combining soft N774 semi-reinforcing carbon black and medium-particle-size ST1120 carbon black, the smaller the particle size of the carbon black, the faster the increase amplitude of the compression permanent deformation, and the two carbon blacks selected by the invention are better than the latter two carbon blacks compared with the small-particle-size carbon black (such as hard high-wear-resistance and fast-extrusion carbon black) in the compression permanent deformation, wherein the N774 semi-reinforcing carbon black not only meets the strength requirement of the material, but also has good compression resilience, and the medium-particle-size ST1120 carbon black in the filling has a certain reinforcing effect, and the hardness increase amplitude is small under the condition of the same carbon black filling amount, so that the swelling of the rubber material in IRM903 oil can be reduced through a certain amount of filling, and meanwhile, the rubber material also has the characteristic of good compression resilience.

As another embodiment, the peroxide curing agent PERKADOXA 14 and the peroxide crosslinking assistant ChemimixPMA-201 are used in combination in this example, and the weight percentages of the components are 2.0%. The peroxide curative PERKADOXA 14 supplier in this example is Shanghai Jinchang chemical Co., Ltd. The supplier of the crosslinking assistant ChemimixPMA-201 in this example is Shanghai Seisakusho chemical Co., Ltd.

In the embodiment, a method of combining a peroxide vulcanizing agent PERKADOXA 14 and a peroxide crosslinking assistant ChemimixPMA-201 is adopted, so that carbon-carbon bonds can be formed on vulcanized rubber, and the crosslinking density of the rubber is improved, so that the requirements of low swelling and low pressure change of the material in IRM903 oil are met.

The IRM903 oil medium-low pressure variable nitrile rubber material of the embodiment is implemented by the three methods, so that the material not only meets the SAE J200M2CH714A25EO15EO35F16 material standard, but also meets the technical index that the B-type compression permanent deformation is less than or equal to 10% after the material is soaked in IRM903 oil at 125 ℃ for 70 h.

The IRM903 oil medium-low pressure variable nitrile rubber material provided by the embodiment can be applied to rubber sealing elements for various automobile engine filters, and also can be applied to IRM903 oil medium-low pressure variable nitrile rubber products for other engineering equipment.

The embodiment also provides a preparation method of the IRM903 oil medium-low pressure variable nitrile rubber material, which is prepared by adopting the material components and specifically comprises the following steps of mixing master batch: adding the material components into an internal mixer for mixing uniformly, and discharging rubber when the mixing temperature reaches 125-135 ℃; and (3) vulcanization: filling the molded rubber material into a mold cavity, vulcanizing the rubber material on a vulcanizing machine at 170-175 ℃ for 6min to obtain a first-stage vulcanized product, and performing secondary treatment at 150 ℃ for 120min to finally obtain the low-pressure variable nitrile rubber sealing product in IRM903 oil.

Preferably, in this embodiment, all the components in table 1 except the peroxide curing agent PERKADOXA 14 and the crosslinking assistant PMA-201 may be added to an internal mixer to be mixed uniformly, after the masterbatch mixed in step (1) is left for 8 hours, the masterbatch is put into the internal mixer, at this time, the peroxide curing agent PERKADOXA 14 and the crosslinking assistant ChemmixPMA-201 are added, the temperature of the internal mixer is controlled at 110 to 120 ℃, and the rubber material is mixed for 2.0 to 3.0 minutes and then is discharged.

Specifically, in this embodiment, the preparation method of the IRM903 oil medium-low pressure variable nitrile rubber material of the present invention includes the steps of:

(1) and (3) master batch mixing:

according to the formula, all the ingredients except the vulcanizing agent PERKADOXA 14 and the crosslinking assistant PMA-201 are added into an internal mixer for mixing, and after uniform mixing, rubber is discharged when the mixing temperature reaches 130 ℃.

Further, after the master batch mixed in the step (1) was left for 8 hours, the master batch was charged into an internal mixer, and a vulcanizing agent PERKADOXA 14 and a crosslinking aid ChemimixPMA-201 were added thereto, and the temperature of the internal mixer was controlled at 115 ℃ to mix the mixture for 2.5 minutes, followed by rubber removal.

The two-stage mixing method is adopted in the embodiment, the problem that rubber materials are easy to scorch due to the fact that sulfur is added in the first-stage mixing can be solved, meanwhile, the nitrile rubber and all the compounding agents can be fully infiltrated through placement, a synergistic effect is generated through intermolecular combination, the rubber compound is dispersed more uniformly, and the performance of the rubber materials is more stable.

(2) And (3) vulcanization:

filling the molded rubber material into a mold cavity, vulcanizing on a vulcanizing machine at 172 ℃ for 6min to obtain a first-stage vulcanized product, and performing secondary treatment at 150 ℃ for 120min to finally obtain the low-pressure variable nitrile rubber sealing product in IRM903 oil.

The properties of the IRM903 oil medium-low pressure variable nitrile rubber material prepared in this example are shown in Table 5. The embodiment also provides comparative examples 1 to 3, the preparation methods of the comparative examples 1 to 3 are basically the same as the embodiment 1, and the preparation raw materials are as follows.

Comparative example 1

In the raw rubber system of the comparative example 1, conventional Mooney butyronitrile raw rubber 3345C is adopted, and the Mooney viscosity ML (1+4) is 100 ℃: 45, the weight percentage of the components is 45%, and the formula consists of the following components in percentage by weight, which is shown in table 2.

Table 2 material composition and weight percentage of the formulation of comparative example 1

Name of raw material	Percent (b)%
		Butyronitrile raw rubber 3345C	45.0
Zinc oxide	2.3
		Stearic acid	0.5
Anti-aging agent 4010NA	0.9
		Antiager RD	0.5
Peroxide curing agent PERKADOXA 14	1.8
		Crosslinking aidChemmixPMA-201	1.8
ST1120 carbon Black	29.3
		N774 semi-reinforcing carbon black	11.3
Plasticizer W260S	6.8

The preparation process used is similar to that of example 1, and the properties of the compound are shown in Table 5.

Comparative example 2

In the sizing material reinforcing and filling system of the comparative example 2, only N774 semi-reinforcing carbon black is singly added, and a method of combining with large-particle-size ST1120 carbon black is not adopted, wherein the formula components comprise the following components in percentage by weight, and the specific weight is shown in Table 3.

Table 3 material composition and weight percentage of the formulation of comparative example 2

The preparation process used is similar to that of example 1, and the properties of the compound are shown in Table 5.

Comparative example 3

In the present comparative example 3, an effective curing system was used instead of a peroxide curing system, and the formulation components were composed of the following weight percentages, as shown in table 4.

Table 4 material composition and weight percentage of the formulation of comparative example 3

Name of raw material	Percent (b)%
		high-Mooney nitrile raw rubber 3370C	51.8
Zinc oxide	2.6
		Stearic acid	0.5
Anti-aging agent 4010NA	1.0
		Antiager RD	0.5
Sulfur	0.1
		Accelerator DTDM	0.8
Accelerant CZ	0.6
		Accelerator TMTD	0.6
ST1120 carbon Black	28.5
		N774 semi-reinforcing carbon black	10.4
Plasticizer W260S	2.6

The preparation process used is similar to that of example 1, and the properties of the compound are shown in Table 5.

As can be seen by comparing the test performance of the nitrile rubber materials in the example 1 and the comparative examples 1 to 3, the nitrile rubber material in the example 1 not only meets the material standard of SAE J200M2CH714A25EO15EO35F16, but also can meet the technical index that the B-type compression permanent deformation is less than or equal to 10% after the material is soaked in IRM903 oil at 125 ℃ for 70h, and the compression permanent deformation at 125 ℃ for 70h in the comparative examples 1 to 3IRM903 oil is more than 10% and can not meet the requirement of the material standard.

TABLE 5 comparison of test Properties of nitrile rubber materials of example 1 and comparative examples 1 to 3

Example 2

The IRM903 oil medium-low pressure variable nitrile rubber material comprises the following components in percentage by weight:

TABLE 6 example 2 composition and percentage content of low pressure variable nitrile rubber material in IRM903 oil

Name of raw material	Percent (b)%
		high-Mooney nitrile raw rubber 3370C	47.0
Zinc oxide	3.0
		Stearic acid	0.7
Anti-aging agent 4010NA	1.2
		Antiager RD	0.6
Peroxide curing agent PERKADOXA 14	2.5
		Crosslinking assistant ChemimixPMA-201	2.0
ST1120 carbon Black	30.0
		N774 semi-reinforcing carbon black	9.0
Plasticizer W260S	4.0

The invention relates to a preparation method of an IRM903 oil medium-low pressure variable nitrile rubber material, which comprises the following steps:

(1) and (3) master batch mixing:

according to the formula, all the components in the table 6 except the peroxide curing agent PERKADOXA 14 and the crosslinking assistant PMA-201 are added into an internal mixer to be mixed uniformly, and after the uniform mixing, the rubber is discharged when the mixing temperature reaches 125 ℃.

Further, after the master batch mixed in the step (1) was left for 8 hours, the master batch was charged into an internal mixer, and a vulcanizing agent PERKADOXA 14 and a crosslinking aid ChemimixPMA-201 were added thereto, and the temperature of the internal mixer was controlled at 110 ℃ to mix the rubber compound for 3.0 minutes, followed by rubber removal.

(2) And (3) vulcanization:

filling the molded rubber material into a mold cavity, vulcanizing at 175 ℃ for 6min on a vulcanizing machine to obtain a first-stage vulcanized product, and performing secondary treatment at 150 ℃ for 120min to finally obtain the low-pressure variable nitrile rubber sealing product in IRM903 oil.

The performance of the low-pressure variable nitrile rubber material in the IRM903 oil prepared in the embodiment is similar to that of the nitrile rubber material in the table 5 in the embodiment 1, the compression set at 125 ℃ for 70h in the IRM903 oil is slightly lower than that in the embodiment 1, and the performance of the IRM901# oil is slightly worse than that in the embodiment 1. Wherein, the material standard is as follows:

SAE J200M2CH714a25EO15 EO35F16Z16, Z16: the compression permanent deformation of IRM903 oil at 125 ℃ for 70h is less than or equal to 10 percent.

Example 3

The IRM903 oil medium-low pressure variable nitrile rubber material comprises the following components in percentage by weight:

TABLE 7 EXAMPLE 3 Components and percent amounts of Low pressure variable nitrile rubber materials in IRM903 oil

Name of raw material	Percent (b)%
		high-Mooney nitrile raw rubber 3370C	52.0
Zinc oxide	2.0
		Stearic acid	0.3
Anti-aging agent 4010NA	0.8
		Antiager RD	0.4
Peroxide curing agent PERKADOXA 14	1.5
		Crosslinking assistant ChemimixPMA-201	1.5
ST1120 carbon Black	27.0
		N774 semi-reinforcing carbon black	12.0
Plasticizer W260S	2.5

The invention relates to a preparation method of an IRM903 oil medium-low pressure variable nitrile rubber material, which comprises the following steps:

(1) and (3) master batch mixing:

the formulation of claim 1, wherein all the components shown in Table 7 except the peroxide curing agent PERKADOXA 14 and the crosslinking assistant PMA-201 are added into an internal mixer for uniform mixing, and when the mixing temperature reaches 135 ℃, the mixture is discharged.

Further, after the master batch mixed in the step (1) was left for 8 hours, the master batch was charged into an internal mixer, and a vulcanizing agent PERKADOXA 14 and a crosslinking aid ChemimixPMA-201 were added thereto, and the temperature of the internal mixer was controlled at 120 ℃ to mix the mixture for 2.0 minutes, followed by rubber removal.

(2) And (3) vulcanization:

filling the molded rubber material into a mold cavity, vulcanizing at 170 ℃ for 6min on a vulcanizing machine to obtain a first-stage vulcanized product, and performing secondary treatment at 150 ℃ for 120min to finally obtain the low-pressure variable nitrile rubber sealing product in IRM903 oil.

The performance of the IRM903 oil medium-low pressure variable nitrile rubber material prepared in this example is similar to that of table 5 in example 1, and the compression set at 125 ℃ x 70h in IRM903 oil is slightly higher than that in example 1, wherein the material standard is as follows: SAE J200M2CH714a25EO15 EO35F16Z16, Z16: the compression permanent deformation of IRM903 oil at 125 ℃ for 70h is less than or equal to 10 percent.

Example 4

The IRM903 oil medium-low pressure variable nitrile rubber material comprises the following components in percentage by weight:

TABLE 8 example 4 composition and percentage content of low pressure variable nitrile rubber material in IRM903 oil

The performance of the IRM903 medium-low pressure variable nitrile rubber material prepared in the embodiment is similar to that of the IRM 5 in the embodiment 1, and the IRM901# oil resistance is slightly worse than that of the embodiment 1, wherein the material standard: SAE J200M2CH714a25EO15 EO35F16Z16, Z16: the compression permanent deformation of IRM903 oil at 125 ℃ for 70h is less than or equal to 10 percent.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.