A rubber and its preparation method and application

Abstract

The present invention relates to the technical field of polymer materials, and specifically discloses a rubber and its preparation method and application. The rubber provided by the present invention comprises 50 - 60 parts of matrix rubber, 4 - 6 parts of modified nano-titanium dioxide, 6 - 10 parts of modified carbon fiber, 1 - 2 parts of vulcanizing agent, 0.7 - 1.0 part of accelerator, 8 - 10 parts of silane coupling agent, and 1 - 3 parts of antioxidant. The rubber provided by the present invention uses a mixture of fluororubber, ethylene propylene diene monomer rubber and chlorosulfonated polyethylene rubber as the matrix rubber, and at the same time adds modified nano-titanium dioxide, modified carbon fiber, vulcanizing agent, accelerator, silane coupling agent and antioxidant. The several raw material components act synergistically, so that the prepared rubber has both excellent high-temperature aging resistance and pressure resistance.

Description

Technical Field

[0001] The present invention relates to the technical field of polymer materials, and in particular to a rubber and a preparation method and application thereof. Background Art

[0002] In the production process of modern steel industry, rubber rollers for steel plates play a vital role and are widely used in many key links such as steel plate transportation, rolling and surface treatment.

[0003] During the steel plate rolling process, rubber rollers must withstand enormous rolling pressure. However, existing rubber rollers for steel plates have significant deficiencies in their pressure resistance. When subjected to long-term high-pressure working environments, conventional rubber rollers are prone to deformation, dents, and even cracks in the rubber layer. Furthermore, some steel plate production scenarios involve relatively high operating temperatures. For example, in the subsequent processing of hot-rolled steel plates, the temperature around the rubber rollers can often reach over 180°C. Existing rubber rollers for steel plates have poor resistance to high-temperature aging. After long-term use in high-temperature environments, the rubber material ages and hardens, causing the roller surface to lose elasticity and reduce friction, which in turn affects the conveying and handling of the steel plates. Aged rubber rollers are also prone to problems such as debonding, which significantly shortens the roller's overall service life and greatly limits the efficient and stable operation of the steel plate production process. In summary, the development of a rubber roller with excellent pressure resistance and high-temperature aging resistance has become a critical technical issue that needs to be urgently addressed in the steel industry. Summary of the invention

[0004] Aiming at the problem that existing rubber has poor high temperature resistance and pressure resistance, the present invention provides a rubber and a preparation method and application thereof.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0006] The present invention provides a rubber comprising the following raw material components in parts by mass: 50-60 parts of base rubber, 4-6 parts of modified nano titanium dioxide, 6-10 parts of modified carbon fiber, 1-2 parts of vulcanizing agent, 0.7-1.0 parts of accelerator, 8-10 parts of silane coupling agent and 1-3 parts of antioxidant;

[0007] The base rubber is a mixture of fluororubber, EPDM rubber and chlorosulfonated polyethylene rubber;

[0008] The modified nano titanium dioxide is nano titanium dioxide modified with polydopamine and polyethylene glycol;

[0009] The modified carbon fiber is a carbon fiber calcined at high temperature.

[0010] Compared with the prior art, in the rubber provided by the present invention, fluororubber has excellent high-temperature aging resistance characteristics, with a stable molecular structure and still maintaining good physical and chemical properties at high temperatures. Using fluororubber can, to a certain extent, improve the high-temperature aging resistance and pressure resistance of the rubber; the addition of ethylene propylene diene monomer (EPDM) rubber can further improve the high-temperature aging resistance of the rubber, and its stable molecular structure also endows EPDM rubber with excellent elasticity. When added to the rubber system, it can enable the rubber to play a buffering role under pressure, reduce stress concentration in the rubber, and improve the pressure resistance performance. Moreover, when EPDM rubber is added to the rubber system, it is also conducive to forming a uniform and stable structure with other matrix rubbers, thereby increasing the service life of the rubber; the chlorosulfonyl group in chlorosulfonated polyethylene rubber further enhances the thermal stability of the rubber. It crosslinks with fluororubber and EPDM rubber to form a network structure, further stabilizing the overall structure of the rubber, and thus improving the pressure resistance performance of the rubber.

[0011] In the modified nano-titanium dioxide provided by the present invention, polydopamine has thermal stability and can form strong chemical bonds or hydrogen bonds with the active groups on the molecular chains of the matrix rubber in a high-temperature environment, thereby restricting the excessive movement of the matrix rubber at high temperatures and effectively improving the high-temperature aging resistance of the rubber. Moreover, after the rubber is stressed, polydopamine enhances the interfacial bonding force between the modified nano-titanium dioxide and the matrix rubber, evenly dispersing the pressure to other parts of the rubber matrix and preventing rupture caused by local pressure concentration, thus improving the pressure resistance performance of the rubber; polyethylene glycol has certain fluidity and lubricity. By modifying nano-titanium dioxide with polyethylene glycol, the friction between nano-titanium dioxide and the molecular chains of the matrix rubber can be reduced, thereby ensuring the elasticity of the rubber at high temperatures and improving the pressure resistance performance. At the same time, the nano-titanium dioxide modified by polydopamine and polyethylene glycol can make titanium dioxide evenly distributed in the matrix rubber, and the flexible chain segments of polyethylene glycol can also assist nano-titanium dioxide in better dispersing pressure, thereby improving the pressure resistance performance of the rubber and further increasing the service life of the rubber under high pressure.

[0012] The carbon fiber after high-temperature calcination has a large specific surface area and many active groups. Adding the modified carbon fiber to the rubber system can improve the bonding force between the carbon fiber and the matrix rubber. When stressed, the stress can be effectively dispersed between the carbon fiber and the matrix rubber, avoiding problems such as rubber fracture caused by excessive stress concentration, and thus extending the service life of the rubber; the carbon fiber after high-temperature calcination has a stable structure under high-temperature conditions and can restrict the movement of the molecular chains of the matrix rubber at high temperatures, thereby significantly improving the high-temperature aging resistance performance of the rubber.

[0013] In the present invention, the vulcanizing agent can promote the cross-linking between matrix rubber molecules, the accelerator can accelerate the reaction rate between the vulcanizing agent and the matrix rubber, the silane coupling agent can participate in the vulcanization reaction to increase the cross-linking degree between matrix rubbers, and the silane coupling agent can also enhance the bonding force between the matrix rubber and other fillers, and the antioxidant can inhibit the aging of the rubber.

[0014] The rubber provided by the present invention uses a mixture of fluororubber, ethylene propylene diene monomer rubber and chlorosulfonated polyethylene rubber as the matrix rubber, and at the same time adds modified nano-titanium dioxide, modified carbon fiber, vulcanizing agent, accelerator, silane coupling agent and antioxidant. The synergistic effect among several raw material components enables the prepared rubber to have excellent high-temperature aging resistance and pressure resistance.

[0015] The mass ratio of fluororubber, ethylene propylene diene monomer rubber and chlorosulfonated polyethylene rubber in the matrix rubber is 4:(2.5 - 3):(3 - 3.5).

[0016] By defining the dosage relationship among the three matrix rubbers, the present invention can endow the rubber with both high-temperature aging resistance and pressure resistance.

[0017] The preparation method of the modified nano-titanium dioxide includes the following steps:

[0018] a. Disperse nano-titanium dioxide in water to obtain a nano-titanium dioxide dispersion;

[0019] b. Add dopamine to the nano-titanium dioxide dispersion under the condition of pH 8 - 9, and keep it warm at 30°C - 35°C to obtain a polydopamine-modified nano-titanium dioxide dispersion;

[0020] c. Add polyethylene glycol and tosyl chloride to dichloromethane to obtain a polyethylene glycol mixed solution;

[0021] d. Add the polyethylene glycol mixed solution to the polydopamine-modified nano-titanium dioxide dispersion, and keep it warm at 50°C - 55°C to obtain the modified nano-titanium dioxide.

[0022] In the preparation method of the modified nano-titanium dioxide provided by the present invention, under specific alkaline conditions, dopamine can self-polymerize on the surface of nano-titanium dioxide to form polydopamine, and polydopamine contains some rich active sites such as amino groups and phenolic hydroxyl groups, which is beneficial to the subsequent grafting of polyethylene glycol; tosyl chloride can activate the hydroxyl groups on polyethylene glycol, making it easier to graft onto polydopamine to form stable modified nano-titanium dioxide. The preparation method provided by the present invention is simple, and the conditions during the preparation process are mild, and it can efficiently prepare modified nano-titanium dioxide with excellent performance, laying a solid foundation for improving the comprehensive performance of rubber.

[0023] Preferably, in step a, the particle size of the nano-titanium dioxide is 25 nm - 28 nm.

[0024] Preferably, in step a, the concentration of the nano-titanium dioxide dispersion is 20 g / L - 30 g / L.

[0025] Preferably, the mass ratio of the nano-titanium dioxide to dopamine is (7 - 8):1.

[0026] Preferably, in step b, the heat preservation time is 25 h - 30 h.

[0027] More preferably, in step b, stirring treatment is also required during heat preservation, and the stirring rate is 300 rpm - 400 rpm.

[0028] Preferably, in step c, the polyethylene glycol is polyethylene glycol 4000.

[0029] Preferably, in step c, the molar ratio of the polyethylene glycol to the toluenesulfonyl chloride is 1:(1 - 2).

[0030] Preferably, in step c, the concentration of the polyethylene glycol in the polyethylene glycol mixed solution is 0.5 mol / L - 0.8 mol / L.

[0031] Preferably, the mass ratio of the nano-titanium dioxide to the polyethylene glycol is 1:(0.6 - 0.7).

[0032] Preferably, in step d, the heat preservation time is 18 h - 24 h.

[0033] Preferably, in step d, stirring treatment is also required during heat preservation.

[0034] Preferably, in step d, the mixture after heat preservation also needs post-treatment, which specifically includes the following: centrifugation, solid-liquid separation, washing, and drying to obtain the modified nano-titanium dioxide.

[0035] Preferably, the conditions for the high-temperature calcination are: temperature 380 °C - 390 °C, and time 40 min - 45 min.

[0036] The present invention further defines the calcination conditions. The inventors have found through a large number of studies that the temperature and time of high-temperature calcination have an extremely crucial impact on the performance of carbon fibers. If the temperature is too high, the carbon fibers will be over-oxidized, thereby reducing the strength of the carbon fibers; if the temperature is too low, the performance of the carbon fibers obtained by oxidation is unstable, and there are fewer surface active groups, reducing the bonding force with the matrix rubber.

[0037] The silane coupling agent is at least one of vinyltriethoxysilane or γ-glycidoxypropyltrimethoxysilane.

[0038] The vulcanizing agent is at least one of dicumyl peroxide or benzoyl peroxide 2,4-dichloride.

[0039] The accelerator is dibenzothiazole disulfide.

[0040] The anti-aging agent is at least one of anti-aging agent MB or anti-aging agent AW.

[0041] The present invention provides a method for preparing the above rubber, comprising the following steps:

[0042] S1. At 90°C - 100°C, the weighed matrix rubber, modified nano-titanium dioxide and modified carbon fiber are mixed and then kneaded to obtain a matrix rubber mixture;

[0043] S2. At 110°C - 115°C, the vulcanizing agent, accelerator, silane coupling agent, anti-aging agent and the matrix rubber mixture are mixed and then kneaded to obtain a primary rubber mixture;

[0044] S3. At 140°C - 145°C, the primary rubber mixture is vulcanized to obtain the rubber.

[0045] The method for preparing the rubber provided by the present invention significantly improves the comprehensive performance of the rubber product, has extremely high industrial application value, and is easy to operate, suitable for industrial production.

[0046] Preferably, in S1, the kneading time is 30 min - 40 min.

[0047] Preferably, in S1, stirring is required during kneading, and the rotation speed is 30 r / min - 60 r / min.

[0048] Preferably, in S2, the kneading time is 15 min - 20 min.

[0049] Preferably, in S2, stirring is required during kneading, and the rotation speed is 30 r / min - 60 r / min.

[0050] It should be further noted that in S2, degassing treatment is required after kneading.

[0051] Preferably, in S3, the vulcanization treatment time is 30 min - 40 min.

[0052] The present invention provides the application of the above rubber or the rubber prepared by the above rubber method in the preparation of a rubber roller for a steel plate. Specific embodiments

[0053] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] To better illustrate the present invention, further examples will be given below through embodiments.

[0055] Embodiment 1

[0056] This embodiment provides a rubber, which comprises the following raw material components in parts by mass: 60 parts of matrix rubber, 4 parts of modified nano-titanium dioxide, 10 parts of modified carbon fiber, 1 part of diisopropylbenzene peroxide, 1 part of dibenzothiazole disulfide, 8 parts of vinyltriethoxysilane, and 3 parts of antioxidant MB;

[0057] Among them, the matrix rubber is a mixture of fluororubber, ethylene propylene diene monomer rubber and chlorosulfonated polyethylene rubber with a mass ratio of 4:2.5:3;

[0058] The preparation method of the modified nano-titanium dioxide comprises the following steps:

[0059] a. Dispersing 70 g of nano-titanium dioxide with a particle size of 25 nm in water to obtain a nano-titanium dioxide dispersion with a concentration of 20 g / L;

[0060] b. Adding 10 g of dopamine to the nano-titanium dioxide dispersion under the condition of pH = 9, and keeping it warm at 30 °C for 25 h. During the heat preservation, it is necessary to stir at a rate of 300 rpm to obtain a polydopamine-modified nano-titanium dioxide dispersion;

[0061] c. Adding 42 g (0.0105 mol) of polyethylene glycol 4000 and 2 g (0.0105 mol) of tosyl chloride to dichloromethane to obtain a polyethylene glycol mixed solution with a concentration of 0.5 mol / L of polyethylene glycol 4000;

[0062] d. Adding the polyethylene glycol mixed solution to the polydopamine-modified nano-titanium dioxide dispersion, keeping it warm at 55 °C for 18 h, centrifuging, separating the solid and liquid, washing, and drying to obtain modified nano-titanium dioxide;

[0063] The treatment conditions of the modified carbon fiber are as follows: calcining at 380 °C for 45 min.

[0064] The preparation method of the rubber provided in this embodiment comprises the following steps:

[0065] S1. At 100 °C, mix the weighed matrix rubber, modified nano-titanium dioxide and modified carbon fiber and knead for 30 min. During the kneading, it is necessary to stir at a rotation speed of 30 r / min to obtain a matrix rubber mixture;

[0066] S2. At 110°C, mix dicumyl peroxide, dibenzothiazole disulfide, vinyltriethoxysilane, antioxidant MB and the matrix rubber mixture, and then knead for 15 minutes. Stirring is required during kneading, with a rotation speed of 30 r / min, to obtain a primary rubber mixture;

[0067] S3. At 140°C, vulcanize the primary rubber mixture for 30 minutes to obtain rubber.

[0068] Example 2

[0069] This example provides a rubber, which includes the following raw material components in parts by mass: 50 parts of matrix rubber, 6 parts of modified nano-titanium dioxide, 6 parts of modified carbon fiber, 2 parts of benzoyl peroxide dichloride, 0.7 part of dibenzothiazole disulfide, 10 parts of γ-glycidoxypropyltrimethoxysilane, and 1 part of antioxidant AW;

[0070] Among them, the matrix rubber is a mixture of fluororubber, ethylene propylene diene monomer rubber and chlorosulfonated polyethylene rubber with a mass ratio of 4:3:3.5;

[0071] The preparation method of the modified nano-titanium dioxide includes the following steps:

[0072] a. Disperse 80 g of nano-titanium dioxide with a particle size of 28 nm in water to obtain a nano-titanium dioxide dispersion with a concentration of 30 g / L;

[0073] b. At a pH of 8, add 10 g of dopamine to the nano-titanium dioxide dispersion, and keep it at 35°C for 30 h. Stirring is required during the heat preservation at a rate of 400 rpm to obtain a polydopamine-modified nano-titanium dioxide dispersion;

[0074] c. Add 56 g (0.014 mol) of polyethylene glycol 4000 and 5.34 g (0.028 mol) of tosyl chloride to dichloromethane to obtain a polyethylene glycol mixed solution with a concentration of polyethylene glycol 4000 of 0.8 mol / L;

[0075] d. Add the polyethylene glycol mixed solution to the polydopamine-modified nano-titanium dioxide dispersion, keep it at 50°C for 24 h, centrifuge, separate the solid and liquid, wash, and dry to obtain modified nano-titanium dioxide;

[0076] The treatment conditions of the modified carbon fiber are as follows: Calcinate at 390°C for 40 minutes.

[0077] The preparation method of the rubber provided in this example includes the following steps:

[0078] S1. At 90 °C, weigh the matrix rubber, modified nano-titanium dioxide, and modified carbon fiber, mix them, and knead for 40 min. Stirring is required during kneading at a rotation speed of 60 r / min to obtain a matrix rubber mixture.

[0079] S2. At 115 °C, mix benzoyl peroxide dichloride, dibenzothiazole disulfide, γ-glycidoxypropyltrimethoxysilane, antioxidant AW, and the matrix rubber mixture, and knead for 20 min. Stirring is required during kneading at a rotation speed of 60 r / min to obtain a primary rubber mixture.

[0080] S3. At 145 °C, vulcanize the primary rubber mixture for 40 min to obtain rubber.

[0081] Example 3

[0082] This example provides a rubber, which includes the following raw material components in parts by mass: 55 parts of matrix rubber, 5 parts of modified nano-titanium dioxide, 8 parts of modified carbon fiber, 1.5 parts of benzoyl peroxide dichloride, 0.8 part of dibenzothiazole disulfide, 9 parts of γ-glycidoxypropyltrimethoxysilane, and 2 parts of antioxidant AW.

[0083] Among them, the matrix rubber is a mixture of fluororubber, ethylene propylene diene monomer rubber, and chlorosulfonated polyethylene rubber with a mass ratio of 4:2.8:3.2.

[0084] The preparation method of the modified nano-titanium dioxide includes the following steps:

[0085] a. Disperse 75 g of nano-titanium dioxide with a particle size of 26 nm in water to obtain a nano-titanium dioxide dispersion with a concentration of 25 g / L.

[0086] b. At a pH of 8.5, add 10 g of dopamine to the nano-titanium dioxide dispersion, keep it warm at 32 °C for 28 h, and stir at a rate of 350 rpm during warming to obtain a polydopamine-modified nano-titanium dioxide dispersion.

[0087] c. Add 48.75 g (0.012 mol) of polyethylene glycol 4000 and 3.43 g (0.018 mol) of tosyl chloride to dichloromethane to obtain a polyethylene glycol mixed solution with a concentration of polyethylene glycol 4000 of 0.6 mol / L.

[0088] d. Add the polyethylene glycol mixed solution to the polydopamine-modified nano-titanium dioxide dispersion, keep it warm at 53 °C for 20 h, centrifuge, separate the solid and liquid, wash, and dry to obtain modified nano-titanium dioxide.

[0089] The treatment conditions of the modified carbon fiber are as follows: Calcinate at 385 °C for 42 min.

[0090] The preparation method of the rubber provided in this embodiment includes the following steps:

[0091] S1. At 95 °C, the weighed matrix rubber, modified nano-titanium dioxide and modified carbon fiber are mixed and kneaded for 35 min. Stirring is required during kneading, and the rotation speed is 40 r / min to obtain a matrix rubber mixture;

[0092] S2. At 112 °C, benzoyl peroxide dichloride, dibenzothiazole disulfide, γ-glycidoxypropyltrimethoxysilane, antioxidant AW and the matrix rubber mixture are mixed and kneaded for 18 min. Stirring is required during kneading, and the rotation speed is 40 r / min to obtain a primary rubber mixture;

[0093] S3. At 143 °C, the primary rubber mixture is vulcanized for 35 min to obtain the rubber.

[0094] Comparative Example 1

[0095] This comparative example provides a rubber. Compared with Example 1, the difference is that the ethylene propylene diene monomer rubber is replaced with an equal amount of fluororubber, and other operations are the same as those in Example 1.

[0096] Comparative Example 2

[0097] This comparative example provides a rubber. Compared with Example 1, the difference is that the chlorosulfonated polyethylene rubber is replaced with an equal amount of fluororubber, and other operations are the same as those in Example 1.

[0098] Comparative Example 3

[0099] This comparative example provides a rubber. Compared with Example 1, the difference is that the chlorosulfonated polyethylene rubber is replaced with an equal amount of hydrogenated nitrile rubber, and other operations are the same as those in Example 1.

[0100] Comparative Example 4

[0101] This comparative example provides a rubber. Compared with Example 1, the difference is that the modified nano-titanium dioxide is nano-titanium dioxide modified with polydopamine, and the preparation method of the modified nano-titanium dioxide includes the following steps:

[0102] a. 70 g of nano-titanium dioxide with a particle size of 25 nm is dispersed in water to obtain a nano-titanium dioxide dispersion with a concentration of 20 g / L;

[0103] b. At a pH of 9, 10 g of dopamine is added to the nano-titanium dioxide dispersion, and it is kept warm at 30 °C for 25 h. Stirring is required during the heat preservation at a rate of 300 rpm, centrifuged, solid-liquid separated, washed, and dried to obtain the modified nano-titanium dioxide.

[0104] Other operations are the same as those in Example 1.

[0105] Comparative Example 5

[0106] This comparative example provides a rubber. Compared with Example 1, the difference is that the modified nano-titanium dioxide is nano-titanium dioxide modified by polyethylene glycol, and the preparation method of the modified nano-titanium dioxide includes the following steps:

[0107] a. Disperse 70 g of nano-titanium dioxide with a particle size of 25 nm in water to obtain a nano-titanium dioxide dispersion with a concentration of 20 g / L;

[0108] b. Add 42 g (0.0105 mol) of polyethylene glycol 4000 and 2 g (0.0105 mol) of tosyl chloride to dichloromethane to obtain a polyethylene glycol mixed solution with a concentration of polyethylene glycol 4000 of 0.5 mol / L;

[0109] c. Add the polyethylene glycol mixed solution to the nano-titanium dioxide dispersion, keep it warm at 55 °C for 18 h, centrifuge, separate the solid and liquid, wash, and dry to obtain the modified nano-titanium dioxide;

[0110] Other operations are the same as those in Example 1.

[0111] Comparative Example 6

[0112] This comparative example provides a rubber. Compared with Example 1, the difference is that polyethylene glycol is replaced by an equal amount of hydroxypropyl methylcellulose, and other operations are the same as those in Example 1.

[0113] Comparative Example 7

[0114] This comparative example provides a rubber. Compared with Example 1, the difference is that the modified carbon fiber is replaced by an equal amount of carbon fiber, and the modified method of high-temperature calcination is not used, and other operations are the same as those in Example 1.

[0115] The line pressure and high-temperature aging resistance of the rubbers prepared in Examples 1-3 and Comparative Examples 1-7 of the present invention were detected. The specific detection methods are as follows:

[0116] Among them, the detection of high-temperature aging resistance refers to GB / T3512-2014 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests

[0117] The linear pressure of the rubber was detected by a caster life tester provided by Zhongshan Bangteng Technology Development Co., Ltd. The specific parameters were as follows: the total rotation stroke was 20,000 m, the time was 120 min, the test speed was 6 km / h, the test loads were 400 kg, 500 kg, and 600 kg respectively, and the contact length was 8 cm. If the tester had an automatic product damage identification function, when the polyurethane wheel was damaged, such as wheel body rupture, degumming, severe wear, etc., the tester would automatically stop. Among them, the linear pressure (kg / cm) = load / contact length.

[0118] The specific test results are shown in Table 1:

[0119] Table 1 Test Results

[0120]

[0121] As can be seen from Table 1 of the present invention, the rubber prepared by using the components and preparation method provided by the present invention simultaneously has excellent high-temperature aging resistance and pressure resistance. After being treated at a high temperature of 300 °C for 72 h, the change in its tensile strength is less than 4.2%, and the change in the elongation at break is less than 8.1%. And by testing the linear pressure under a certain load condition, the linear pressure can reach 100 kg / mm without damage. From Comparative Examples 1-7, it can be seen that whether replacing the matrix resin of the present invention, changing the modification method of nano-titanium dioxide in the present invention, or using conventional carbon fiber to replace the conditions of Example 1, the thermal aging resistance and the detected values of the linear pressure of the rubber prepared in Comparative Examples 1-7 are lower than the detection data provided by Examples 1-3 of the present invention.

[0122] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rubber, characterized in that, It comprises the following raw material components in parts by mass: 50 - 60 parts of matrix rubber, 4 - 6 parts of modified nano-titanium dioxide, 6 - 10 parts of modified carbon fiber, 1 - 2 parts of vulcanizing agent, 0.7 - 1.0 part of accelerator, 8 - 10 parts of silane coupling agent and 1 - 3 parts of antioxidant; The matrix rubber is a mixture of fluororubber, ethylene propylene diene monomer rubber and chlorosulfonated polyethylene rubber; The modified nano-titanium dioxide is nano-titanium dioxide modified by polydopamine and polyethylene glycol; The modified carbon fiber is carbon fiber calcined at high temperature; In the matrix rubber, the mass ratio of fluororubber, ethylene propylene diene monomer rubber and chlorosulfonated polyethylene rubber is 4:(2.5 - 3):(3 - 3.5).

2. The rubber according to claim 1, wherein The preparation method of the modified nano-titanium dioxide comprises the following steps: a. Disperse nano-titanium dioxide in water to obtain a nano-titanium dioxide dispersion; b. Under the condition of pH 8 - 9, add dopamine to the nano-titanium dioxide dispersion and keep it warm at 30℃ - 35℃ to obtain a polydopamine-modified nano-titanium dioxide dispersion; c. Add polyethylene glycol and tosyl chloride to dichloromethane to obtain a polyethylene glycol mixed solution; d. Add the polyethylene glycol mixed solution to the polydopamine-modified nano-titanium dioxide dispersion and keep it warm at 50℃ - 55℃ to obtain the modified nano-titanium dioxide.

3. The rubber according to claim 2, characterized in that, In step a, the particle size of the nano-titanium dioxide is 25nm - 28nm; and / or In step a, the concentration of the nano-titanium dioxide dispersion is 20g / L - 30g / L; and / or The mass ratio of the nano-titanium dioxide to dopamine is (7 - 8):

1.

4. The rubber according to claim 2, characterized in that, In step b, the heat preservation time is 25h - 30h; and / or In step c, the polyethylene glycol is polyethylene glycol 4000.

5. The rubber according to claim 2, wherein, In step c, the molar ratio of polyethylene glycol to tosyl chloride is 1:(1 - 2); and / or In step c, the concentration of polyethylene glycol in the polyethylene glycol mixed solution is 0.5mol / L - 0.8mol / L; and / or The mass ratio of the nano-titanium dioxide to polyethylene glycol is 1:(0.6 - 0.7); and / or In step d, the heat preservation time is 18h - 24h.

6. The rubber according to claim 2, characterized in that, The conditions for the high-temperature calcination are: temperature 380℃ - 390℃, time 40min - 45min.

7. The rubber according to claim 1, characterized in that, The silane coupling agent is at least one of vinyltriethoxysilane or γ-glycidoxypropyltrimethoxysilane; and / or The vulcanizing agent is at least one of dicumyl peroxide or 2,4-dichlorobenzoyl peroxide.

8. A method for preparing the rubber according to any one of claims 1-7, characterized in that, It comprises the following steps: S1. At 90℃ - 100℃, mix the weighed matrix rubber, modified nano-titanium dioxide and modified carbon fiber and carry out kneading to obtain a matrix rubber mixture; S2. At 110℃ - 115℃, mix the vulcanizing agent, accelerator, silane coupling agent, antioxidant and the matrix rubber mixture and carry out kneading to obtain a primary rubber mixture; S3. At 140℃ - 145℃, carry out vulcanization treatment on the primary rubber mixture to obtain rubber.

9. Use of the rubber according to any one of claims 1 to 7 or the rubber prepared by the method for preparing the rubber according to claim 8 in the preparation of a rubber roll for steel plates.

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