Mixing process method of low-hardness nitrile rubber

Abstract

The invention relates to the technical field of nitrile rubber, in particular to a mixing process method of low-hardness nitrile rubber, which comprises the following steps: S1, preparing raw materials including nitrile rubber, filler, polyvinyl chloride resin, zinc oxide, zinc stearate, a vulcanizing agent and an accelerant. In the preparation process, waste cable sheaths are treated and added, particles prepared after the waste cable sheaths are treated have good supporting performance, a silica network is formed after silica sol is added, pores in all the materials are filled with kaolin, and the compactness of a rubber matrix is jointly improved; meanwhile, through mixing and adding of the ceramic powder, the ceramic powder can cooperate with the waste cable sheath particles to form a supporting structure, the waste cable sheath particles can disperse stress while the high-strength performance of the ceramic powder is used for supporting, and the purpose of improving the wear resistance of the material is achieved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of nitrile rubber, in particular to a mixing process method of low-hardness nitrile rubber. BACKGROUND

[0002] The mixed nitrile rubber is a composite material prepared from nitrile rubber and mixing agents through a mixing process and is widely applied to the fields of sealing parts, rubber tubes, rubber belts and automobile parts.

[0003] In the prior art, the mixed nitrile rubber is in a flexible state with good deformation capacity, and when the surface of the mixed nitrile rubber is rubbed, the stress position of the mixed nitrile rubber is torn and damaged, which affects the wear resistance of the mixed nitrile rubber. Based on this, the application provides a mixing process method of low-hardness nitrile rubber. SUMMARY

[0004] The application aims to provide a mixing process method of low-hardness nitrile rubber, and the mixed nitrile rubber prepared by the application has not only good wear resistance but also excellent strength performance, effectively improving the use performance of the mixed nitrile rubber.

[0005] To achieve the above-mentioned purpose, the application provides the following technical scheme: a mixing process method of low-hardness nitrile rubber, comprising the following steps: S1: raw material preparation, the raw materials include nitrile rubber, fillers, polyvinyl chloride resin, zinc oxide, zinc stearate, vulcanizing agents and accelerators, and the weight percentage of each raw material is as follows: 18-20% fillers, 12-14% polyvinyl chloride resin, 2-3% zinc oxide, 1-2% zinc stearate, 2-3% vulcanizing agents and 1-2% accelerators, and the rest is supplemented by nitrile rubber to 100%; The preparation of the fillers comprises the following steps: Step one: base material preparation; Step two: additive preparation, the mass of the additive is 35-40% of the mass of the base material; Step three: mixing treatment, the base material and the additive are mixed to prepare the fillers; S2: plasticating treatment, the nitrile rubber in S1 is weighed and added to a double-roll rubber mill for plasticating treatment to prepare plasticated rubber, which is ready for use; S3: mixing treatment, the raw materials and the plasticated rubber are mixed to prepare mixed rubber, and then the mixed rubber is subjected to extrusion forming treatment to prepare mixed nitrile rubber.

[0006] Further, the method for preparing the base material is as follows: the base material is prepared by taking waste cable sheath as raw material, cleaning, slitting, grinding and drying the waste cable sheath to obtain powder, adding the powder, ceramic powder, linseed oil and kaolin into a mixer, setting the mixer to stir at 400-600 r / min for 20-30 min to obtain slurry, adding the slurry, ethanol and silica sol into a reaction kettle, setting the reaction kettle to stir at 200-300 r / min at a temperature of 50-60℃ for 30-40 min, and adding the obtained product into an oven to dry at 50-60℃ for 4-6 h.

[0007] Further, the particle size of the powder is 40-100 µm, and the particle size of the ceramic powder is 10-30 µm.

[0008] Further, the mass ratio of the powder, ceramic powder, linseed oil and kaolin is 1:(0.2-0.3):(0.6-0.7):(0.2-0.3), and the mass ratio of the slurry, ethanol and silica sol is 1:(0.5-0.6):(0.2-0.3).

[0009] Further, the method for preparing the additive material is as follows: lignin, konjac glucomannan, cotton and rice bran are added into a mixer, the mixer is set to stir at 200-300 r / min for 6-10 min, the obtained product is added into a water bath kettle, the water bath kettle is set to heat to 60-80℃ and keep for 2-4 h, the heating and keeping process is continuously stirred, then the obtained product is added into a centrifuge, the centrifuge is set to centrifuge at 5000-6000 r / min for 8-12 min, the precipitate in the centrifuged product is added into an oven, the oven is set to dry at 60-70℃ for 3-4 h, the dried product is ground to a particle size of 10-30 µm to obtain the additive material.

[0010] Further, the mass ratio of lignin, konjac glucomannan, cotton and rice bran is 1:(0.2-0.3):(2-3):(1.5-1.7).

[0011] Further, the method for mixing is as follows: the base material and the additive material are added into a mixer, the mixer is set to stir at 600-800 r / min for 30-40 min, the obtained product is added into a muffle furnace, the muffle furnace is set to heat at a rate of 2-3℃ / min, heat to 220-240℃ and keep for 20-30 min, then set to cool at a rate of 4-5℃ / min to 40℃, complete the mixing process to obtain the filler.

[0012] Further, the mixing temperature in S3 is 50-60℃, and the mixing time is 8-10 h.

[0013] Further, the method of the extrusion forming process in S3 is that the rubber compound is added into an open mill, the roll gap is set to 0.5mm, and the rubber compound is passed through the open mill for 5-7 times, and the rubber compound is prepared after being cooled to room temperature, the rubber compound is added into a mold pressing vulcanizing agent, the temperature is set to 150-170℃, the pressure is set to 15-25MPa, and the vulcanization process is performed for 6-12min, and then the rubber compound is treated in an oven with the temperature set to 120-160℃ for 2-4h, and the mixed nitrile rubber is prepared.

[0014] Further, the vulcanizing agent is selected from the group consisting of dicumyl peroxide, the accelerator is selected from the group consisting of dibenzothiazyl disulfide, and the particle size of the zinc oxide is 2-10um.

[0015] Compared with the prior art, the present application has the following advantages: 1、In the present application, by treating and adding the waste cable sheath during preparation, the granular material prepared after the treatment of the waste cable sheath has good supporting performance, the silica sol forms a silica network after being added, the kaolin fills the pores in each material, and the density of the rubber matrix is improved, and by adding the ceramic powder, the ceramic powder and the waste cable sheath granules can form a supporting structure together, the waste cable sheath granules can disperse stress while being supported by the high strength performance of the ceramic powder, and the purpose of improving the wear resistance of the material is achieved.

[0016] 2、In the present application, the lignin and konjac glucomannan can form a flexible network after being added together, can absorb impact energy, can inhibit the generation of cracks when the rubber material is stressed, can improve the strength performance of the rubber material, and the fiber structure of the rice bran and cotton can further improve the strength performance of the rubber material by interlocking. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0018] It should be noted that the raw materials used in the following embodiments are all commercially available.

[0019] Embodiment one: S1: raw material preparation, the raw materials include nitrile rubber, filler, polyvinyl chloride resin, zinc oxide, zinc stearate, vulcanizing agent, and accelerator, and the weight percentage of each raw material is: 18% filler, 12% polyvinyl chloride resin, 2% zinc oxide, 1% zinc stearate, 2% vulcanizing agent, and 1% accelerator, and the balance is made up to 100% by nitrile rubber; The preparation of the filler includes the following steps: Step one: base material preparation; The method for preparing the base material is as follows: the base material is prepared by taking waste cable sheath as raw material, cleaning, slitting, grinding and drying the waste cable sheath to obtain powder, and then adding the powder, ceramic powder, linseed oil and kaolin into a mixer, setting the mixer to stir at 400 r / min for 20 min to obtain slurry, and then adding the slurry, ethanol and silica sol into a reaction kettle, setting the reaction kettle to stir at 200 r / min at a temperature of 50℃ for 30 min, and then adding the obtained product into an oven, setting the oven to dry at 50℃ for 4 h to obtain the base material, wherein the particle size of the powder is 40 μm, the particle size of the ceramic powder is 10 μm, the mass ratio of the powder, ceramic powder, linseed oil and kaolin is 1:0.2:0.6:0.2, and the mass ratio of the slurry, ethanol and silica sol is 1:0.5:0.2; Step two: preparation of additive material, the mass of the additive material is 35% of the mass of the base material; The method for preparing the additive material is as follows: lignin, konjac glucomannan, cotton and rice bran are added into a mixer, the mixer is set to stir at 200 r / min for 6 min, after mixing, the obtained product is added into a water bath kettle, the water bath kettle is set to heat to 60℃ and keep for 2 h, and stirring is continuously performed during the heating and keeping process, then the obtained product is added into a centrifuge, the centrifuge is set to centrifuge at 5000 r / min for 8 min, the precipitate in the centrifuged product is taken out, the precipitate is added into an oven, the oven is set to dry at 60℃ for 3 h, the dried product is ground to a particle size of 10 μm to obtain the additive material, wherein the mass ratio of lignin, konjac glucomannan, cotton and rice bran is 1:0.2:2:1.5; Step three: mixing treatment, the base material and the additive material are mixed to obtain the filler; The method for mixing treatment is as follows: the base material and the additive material are added into a mixer, the mixer is set to stir at 600 r / min for 30 min, the obtained product is added into a muffle furnace, the muffle furnace is set to heat at a rate of 2℃ / min to 220℃ and keep for 20 min, and then set to cool at a rate of 4℃ / min to 40℃, and the mixing treatment is completed to obtain the filler; S2: plastication treatment, the nitrile rubber in S1 is weighed and added into a two-roll rubber mixer for plastication treatment to obtain plasticated rubber, which is ready for use; S3: mixing treatment, each raw material and the plasticated rubber are mixed to obtain mixed rubber, and then the mixed rubber is subjected to extrusion forming treatment to obtain mixed nitrile rubber; The mixing temperature in S3 is 50℃, and the mixing time is 8 h; The method of the extrusion forming treatment in S3 is that the rubber compound is added into an open mill, the roll gap is set to 0.5 mm, and the rubber compound is passed through the open mill for 5 times, and then the rubber compound is cooled to room temperature to obtain a rubber material, the rubber material is added into a mold pressing vulcanizing agent, the temperature is set to 150 DEG C, the pressure is set to 15 MPa, and the vulcanization treatment is performed for 6 min, and then the rubber material is treated in an oven at 120 DEG C for 2 h to obtain the mixed nitrile rubber; The vulcanizing agent is selected from the group consisting of dicumyl peroxide, the accelerator is selected from the group consisting of dibenzothiazyl disulfide, and the particle size of the zinc oxide is 2 microns.

[0020] Example two: S1: raw material preparation, the raw materials include nitrile rubber, filler, polyvinyl chloride resin, zinc oxide, zinc stearate, vulcanizing agent, accelerator, and the weight percentage of each raw material is: 19% filler, 13% polyvinyl chloride resin, 2.5% zinc oxide, 1.5% zinc stearate, 2.5% vulcanizing agent, 1.5% accelerator, and the rest is supplemented by nitrile rubber to 100%; The preparation of the filler includes the following steps: Step one: base material preparation; The method of the base material preparation is that the base material is selected from the group consisting of waste cable sheath as raw material, the waste cable sheath is cleaned, cut, ground, and dried to obtain a powder, the powder, ceramic powder, linseed oil, and kaolin are added into a mixer, the mixer is set to 500 r / min for stirring treatment for 25 min to obtain a slurry, the slurry, ethanol, and silica sol are added into a reaction kettle, the reaction kettle is set to 55 DEG C for constant temperature stirring treatment at a stirring speed of 250 r / min for 35 min, and the obtained product is added into an oven, the oven is set to 55 DEG C for drying treatment for 5 h to obtain the base material, wherein the particle size of the powder is 70 microns, the particle size of the ceramic powder is 20 microns, the mass ratio of the powder, ceramic powder, linseed oil, and kaolin is 1:0.25:0.65:0.25, and the mass ratio of the slurry, ethanol, and silica sol is 1:0.55:0.25; Step two: additive preparation, the mass of the additive is 37% of the mass of the base material; The method of the additive preparation is that the lignin, konjac glucomannan, cotton, and rice bran are added into a mixer, the mixer is set to 250 r / min for stirring treatment for 8 min, after the mixing is completed, the obtained product is added into a water bath kettle, the water bath kettle is set to be heated to 70 DEG C, and the temperature is kept for 3 h, and the stirring is continuously performed during the heating and temperature keeping process, and then the obtained product is added into a centrifugal machine, the centrifugal machine is set to 5500 r / min for centrifugal treatment for 10 min, the precipitate is obtained from the centrifuged product, the precipitate is added into an oven, the oven is set to 65 DEG C for drying treatment for 3.5 h, the dried product is ground to obtain the additive, and the grinding particle size is 20 microns, wherein the mass ratio of the lignin, konjac glucomannan, cotton, and rice bran is 1:0.25:2.5:1.6; Step three: mixing treatment, the base and the additive are mixed to obtain the filler; The mixing method is as follows: the base and the additive are added into a mixer, the mixer is set to stir at 700 r / min for 35 min, the obtained product is added into a muffle furnace, the muffle furnace is set to heat at a rate of 2.5 ℃ / min to 230 ℃, and then kept for 25 min, and then set to cool at a rate of 4.5 ℃ / min to 40 ℃, to complete the mixing treatment, and obtain the filler; S2: plastication treatment, the nitrile rubber in S1 is weighed and added into a two-roll rubber mill for plastication treatment, to obtain plasticated rubber, which is ready for use; S3: mixing treatment, each raw material and the plasticated rubber are mixed to obtain mixed rubber, and then the mixed rubber is subjected to extrusion molding treatment to obtain mixed nitrile rubber; The mixing temperature in S3 is 55 ℃, and the mixing time is 9 h; The extrusion molding treatment method in S3 is as follows: the mixed rubber is added into an open mill, the roll gap is set to 0.5 mm, and the rubber is passed through the mill for 6 times, and then cooled to room temperature to obtain rubber material, which is added into a mold pressing vulcanizing agent, the temperature is set to 160 ℃, the pressure is set to 20 MPa, and the rubber material is vulcanized for 9 min, and then treated in an oven at 140 ℃ for 3 h to obtain the mixed nitrile rubber; The vulcanizing agent is selected from dicumyl peroxide, the accelerator is selected from dibenzothiazyl disulfide, and the particle size of zinc oxide is 6 μm.

[0021] Example three: S1: raw material preparation, the raw materials include nitrile rubber, filler, polyvinyl chloride resin, zinc oxide, zinc stearate, vulcanizing agent, and accelerator, and the weight percentage of each raw material is as follows: 20% filler, 14% polyvinyl chloride resin, 3% zinc oxide, 2% zinc stearate, 3% vulcanizing agent, and 2% accelerator, and the balance is supplemented with nitrile rubber to 100%; The preparation of the filler includes the following steps: Step one: base preparation; The base is prepared by selecting waste cable sheath as raw material, and the waste cable sheath is subjected to cleaning, slitting, grinding, and drying treatment to obtain powder, and then the powder, ceramic powder, linseed oil, and kaolin are added into a mixer, the mixer is set to stir at 600 r / min for 30 min to obtain slurry, and then the slurry, ethanol, and silica sol are added into a reaction kettle, the reaction kettle is set to 60 ℃, and the stirring speed is set to 300 r / min, and then constant temperature stirring treatment is performed for 40 min, and then the obtained product is added into an oven, the oven is set to 60 ℃ for drying treatment for 6 h to obtain the base, wherein the particle size of the powder is 100 μm, the particle size of the ceramic powder is 30 μm, the mass ratio of the powder, ceramic powder, linseed oil, and kaolin is 1:0.3:0.7:0.3, and the mass ratio of the slurry, ethanol, and silica sol is 1:0.6:0.3; Step two: additive preparation, the mass of the additive is 40% of the mass of the base material; The method for preparing the additive is as follows: lignin, konjac glucomannan, cotton, and rice bran are added into a mixer, the mixer is set to stir at 300 r / min for 10 min, after mixing, the obtained product is added into a water bath, the water bath is set to heat to 80℃, and the temperature is kept for 4 h, and stirring is continuously performed during the heating and keeping process, then the obtained product is added into a centrifuge, the centrifuge is set to centrifugal treatment at 6000 r / min for 12 min, the precipitate in the centrifugal product is taken, and the precipitate is added into an oven, the oven is set to dry treatment at 70℃ for 4 h, the dried product is ground, the grinding particle size is 30 μm, and the additive is prepared, wherein the mass ratio of lignin, konjac glucomannan, cotton, and rice bran is 1:0.3:3:1.7; Step three: mixing treatment, the base material and the additive are mixed to prepare the filler; The method for mixing treatment is as follows: the base material and the additive are added into a mixer, the mixer is set to stir at 800 r / min for 40 min, the obtained product is added into a muffle furnace, the muffle furnace is set to an increasing temperature rate of 3℃ / min, the temperature is increased to 240℃, and the temperature is kept for 30 min, then the temperature is decreased to 40℃ at a decreasing temperature rate of 5℃ / min, the mixing treatment is completed, and the filler is prepared; S2: plastication treatment, the nitrile rubber in S1 is weighed and added into a two-roll rubber mill for plastication treatment, and plasticated rubber is prepared and used later; S3: mixing treatment, the raw materials and the plasticated rubber are mixed to prepare mixed rubber, and then the mixed rubber is subjected to extrusion forming treatment to prepare mixed nitrile rubber; The mixing temperature in S3 is 60℃, and the mixing time is 10 h; The method for extrusion forming treatment in S3 is as follows: the mixed rubber is added into an open mill, the roll gap is set to 0.5 mm, and the rubber is passed through the mill for 7 times, and after being cooled to room temperature, the rubber is prepared, the rubber is added into a mold pressing vulcanizing agent, the temperature is set to 170℃, the pressure is set to 25 MPa, and the rubber is vulcanized for 12 min, then the rubber is treated in an oven at 160℃ for 4 h, and the mixed nitrile rubber is prepared; The vulcanizing agent is selected to be dicumyl peroxide, the accelerator is selected to be dibenzothiazyl disulfide, and the particle size of zinc oxide is 10 μm.

[0022] Comparative Example One, the difference between the comparative example and Example One is that equal amount of rice bran is used to replace the additive in the comparative example.

[0023] Comparative Example Two, the difference between the comparative example and Example One is that equal amount of rubber powder is used to replace the filler in the comparative example.

[0024] Comparative Example Three, the difference between the comparative example and Example One is that the additive is not contained in the comparative example.

[0025] Comparative Example Four, which is different from Example One in that the Comparative Example Four does not contain fillers.

[0026] Performance test: the performance of the mixed nitrile rubber prepared in Example One, Example Two, Example Three, Comparative Example One, Comparative Example Two, Comparative Example Three and Comparative Example Four was tested, and the test data are recorded in Table 1 below:

[0027] In the performance test, the test method in GB / T 1689-2014 (Aklon abrasion test) was used to test the wear resistance of the mixed nitrile rubber prepared in Example One, Example Two, Example Three, Comparative Example One, Comparative Example Two, Comparative Example Three and Comparative Example Four. The test method in GB / T 528-2009 was used to test the strength performance of the mixed nitrile rubber prepared in Example One, Example Two, Example Three, Comparative Example One, Comparative Example Two, Comparative Example Three and Comparative Example Four.

[0028] It can be seen that the wear resistance and strength performance of the mixed nitrile rubber prepared in Comparative Examples One, Two, Three and Four are lower than those of Examples One, Two and Three; this shows that: through the treatment and addition of the waste cable sheath in the preparation process, the particles prepared after the treatment of the waste cable sheath have good supporting performance, the silica sol forms a silica network after addition, the kaolin fills the pores in each material, which improves the density of the rubber matrix, and through the mixed addition of the ceramic powder, the ceramic powder can form a supporting structure with the waste cable sheath particles, which supports the high strength performance of the ceramic powder while the waste cable sheath particles can disperse stress and improve the wear resistance of the material; The lignin and konjac glucomannan can form a flexible network after being treated and added together, which can absorb impact energy, inhibit the generation of cracks when the rubber material is stressed, and improve the strength performance of the rubber material, and the fiber structure of rice bran and cotton can further improve the strength performance of the rubber material by interlocking.

[0029] From the comparison and analysis of the relevant data in the table, it can be seen that the mixed nitrile rubber prepared by the present application not only has good wear resistance, but also has excellent strength performance. Therefore, the mixing process of the low-hardness nitrile rubber provided by the present application has a broader market prospect and is more suitable for promotion.

[0030] In the description of the specification, reference to "one embodiment", "an example", "a specific example" or the like means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment", "an example", "a specific example" or the like in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0031] The preferred embodiments of the application disclosed above are only to help explain the application. The preferred embodiments do not describe all the details of the application and limit the application to the specific embodiments described. Obviously, many modifications and variations can be made in light of the contents of the specification. The specification selects and specifically describes these embodiments in order to better explain the principles and practical application of the application, so that those skilled in the art can well understand and utilize the application. The application is limited only by the claims and their full scope and equivalents.

Claims

1. A mixing process for low hardness nitrile rubber characterized by: The method comprises the following steps: S1: raw material preparation, the raw materials include nitrile rubber, filler, polyvinyl chloride resin, zinc oxide, zinc stearate, vulcanizing agent, accelerator, the weight percentage of each raw material is: 18-20% filler, 12-14% polyvinyl chloride resin, 2-3% zinc oxide, 1-2% zinc stearate, 2-3% vulcanizing agent, 1-2% accelerator, and the balance is supplemented by nitrile rubber to 100%; The preparation of the filler comprises the following steps: Step one: base material preparation; Step two: additive preparation, the mass of the additive is 35-40% of the mass of the base material; Step three: mixing treatment, the base material and the additive are mixed to obtain the filler; S2: plasticizing treatment, the nitrile rubber in S1 is weighed and added to a two-roll rubber mixer for plasticizing treatment to obtain plasticized rubber, which is ready for use; S3: mixing treatment, each raw material and the plasticized rubber are mixed to obtain mixed rubber, and then the mixed rubber is subjected to extrusion molding treatment to obtain mixed nitrile rubber.

2. A mixing process method of low hardness nitrile rubber according to claim 1, characterized in that, The method for preparing the base material is as follows: the base material is prepared by taking waste cable sheath as raw material, and the waste cable sheath is subjected to cleaning, slitting, grinding and drying treatment to obtain powder, and the powder, ceramic powder, linseed oil and kaolin are added to a mixer, the mixer is set to 400-600 r / min for stirring treatment for 20-30 min to obtain slurry, and the slurry, ethanol and silica sol are added to a reaction kettle, the reaction kettle is set to a temperature of 50-60℃ and a stirring speed of 200-300 r / min for constant temperature stirring treatment for 30-40 min, and the obtained product is added to an oven, the oven is set to 50-60℃ for drying treatment for 4-6 h to obtain the base material.

3. A mixing process method of low hardness nitrile rubber according to claim 2, characterized in that, The particle size of the powder is 40-100 μm, and the particle size of the ceramic powder is 10-30 μm.

4. A mixing process method of low hardness nitrile rubber according to claim 2, characterized in that, The mass ratio of the powder, ceramic powder, linseed oil and kaolin is 1:(0.2-0.3):(0.6-0.7):(0.2-0.3), and the mass ratio of the slurry, ethanol and silica sol is 1:(0.5-0.6):(0.2-0.3).

5. A mixing process method of low hardness nitrile rubber according to claim 1, characterized in that, The method for preparing the additive is as follows: lignin, konjac glucomannan, cotton and rice bran are added to a mixer, the mixer is set to 200-300 r / min for stirring treatment for 6-10 min, after mixing, the obtained product is added to a water bath kettle, the water bath kettle is set to heating to 60-80℃, and the temperature is kept for 2-4 h, and stirring is continuously performed during the heating and temperature keeping process, then the obtained product is added to a centrifuge, the centrifuge is set to 5000-6000 r / min for centrifugal treatment for 8-12 min, the precipitate in the centrifuged product is taken out, the precipitate is added to an oven, the oven is set to 60-70℃ for drying treatment for 3-4 h, the dried product is subjected to grinding treatment, the grinding particle size is 10-30 μm, and the additive is obtained.

6. A mixing process method of low hardness nitrile rubber according to claim 5, characterized in that, The mass ratio of lignin, konjac glucomannan, cotton and rice bran is 1:(0.2-0.3):(2-3):(1.5-1.7).

7. A mixing process method of low hardness nitrile rubber according to claim 1, characterized in that, The mixing treatment method is that the base material and the additive are added into a mixer, the mixer is set to stirring treatment at 600-800 r / min for 30-40 min, the obtained product is added into a muffle furnace, the muffle furnace is set to an increasing temperature rate of 2-3 ℃ / min, the temperature is increased to 220-240 ℃, and the temperature is kept for 20-30 min, then the temperature is decreased to 40 ℃ at a decreasing temperature rate of 4-5 ℃ / min, the mixing treatment is completed, and the filler is prepared.

8. A mixing process method of low hardness nitrile rubber according to claim 1, characterized by, The mixing temperature in S3 is 50-60 ℃, and the mixing time is 8-10 h.

9. A mixing process method of low hardness nitrile rubber according to claim 1, characterized by, The extrusion molding treatment method in S3 is that the mixed rubber is added into an open mill, the roll gap is set to 0.5 mm, and the mixed rubber is passed through 5-7 times, and after being cooled to room temperature, the rubber material is prepared, the rubber material is added into a mold pressing vulcanizing agent, the temperature is set to 150-170 ℃, the pressure is set to 15-25 MPa, the vulcanization treatment is performed for 6-12 min, then the temperature in an oven is set to 120-160 ℃ for 2-4 h, and the mixed nitrile rubber is prepared.

10. A mixing process method of low hardness nitrile rubber according to claim 1, characterized in that, The vulcanizing agent is selected from the group consisting of dicumyl peroxide, the accelerator is selected from the group consisting of dibenzothiazyl disulfide, and the particle size of the zinc oxide is 2-10 μm.

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