A corrosion-resistant synchronous belt and its preparation method

Abstract

The present invention relates to a corrosion-resistant timing belt and a method for preparing the same. The timing belt comprises, by weight, 100 parts of EPDM rubber, 32-56 parts of modified cis-1,4-butadiene rubber, 25-45 parts of styrene-butadiene rubber, 4-8 parts of fluororubber, 22-38 parts of carbon black, 1.3-2.6 parts of an antioxidant, 1-3 parts of a lubricant, 0.6-1.2 parts of a vulcanizing agent, and 2.2-4.4 parts of a vulcanization accelerator. Compared to commercially available rubber timing belts, the timing belt material prepared by the present invention has the advantages of high strength, high temperature resistance, wear resistance, and chemical corrosion resistance.

Description

Technical Field

[0001] The present invention relates to the field of synchronous belts, and in particular to a corrosion-resistant synchronous belt and a preparation method thereof. Background Art

[0002] A synchronous belt is an endless belt with evenly spaced teeth on its inner circumference. As it rotates, the belt teeth mesh with the tooth grooves of gears to transmit power. As a key component for transmitting energy and controlling motion, synchronous pulleys used in lithium-ion battery equipment play an essential role in modern lithium-ion battery equipment. The precise transmission of synchronous belts ensures efficient energy transfer and reliable operation of the equipment. During the transmission process, synchronous belts can reduce transmission errors and energy loss, improving energy transmission efficiency and thus enhancing the performance and efficiency of lithium-ion battery equipment.

[0003] However, the current material of synchronous belts is mainly polyurethane rubber. Although polyurethane rubber has the advantages of good elasticity, simple process and easy molding, the heat resistance of polyurethane material is poor. It is easy to become sticky at around 80°C. When the temperature is higher, the polyurethane material is easy to soften. In addition, the corrosion resistance of polyurethane material is insufficient. It is easy to hydrolyze in a relatively harsh environment, resulting in a significant decrease in the strength of the synchronous belt, which seriously limits its application in synchronous belts.

[0004] Therefore, there is an urgent need to develop an anti-corrosion synchronous belt that meets the needs of lithium battery processing and recycling equipment. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a corrosion-resistant synchronous belt and a preparation method thereof.

[0006] The purpose of the present invention is achieved by adopting the following technical solutions:

[0007] In a first aspect, the present invention provides a corrosion-resistant synchronous belt, the components of which, calculated by weight, include:

[0008] 100 parts of EPDM rubber, 32-56 parts of modified butadiene rubber, 25-45 parts of styrene-butadiene rubber, 4-8 parts of fluororubber, 22-38 parts of carbon black, 1.3-2.6 parts of antioxidant, 1-3 parts of lubricant, 0.6-1.2 parts of vulcanizing agent and 2.2-4.4 parts of vulcanization accelerator.

[0009] Preferably, the brand of the EPDM rubber is at least one of EPDM 3722P, EPDM 3072EM, and EPDM 4045M.

[0010] Preferably, the brand of the styrene-butadiene rubber is at least one of SBR 1502, SBR 1516, SBR 1706, and SBR 1712.

[0011] Preferably, the fluororubber grade is FPM 26 or FPM 246.

[0012] Preferably, the carbon black is at least one of carbon black N220, carbon black N330, and carbon black N550, more preferably carbon black N550.

[0013] Preferably, the antioxidant is at least one of antioxidant 3100, antioxidant 4010, antioxidant 4010NA, and antioxidant 4020.

[0014] Preferably, the lubricant is at least one of stearic acid, zinc stearate, and magnesium stearate.

[0015] Preferably, the vulcanizing agent is sulfur; and the vulcanization accelerator is at least one of vulcanization accelerator M, vulcanization accelerator TMTD, vulcanization accelerator CZ, and vulcanization accelerator NS.

[0016] Preferably, the preparation method of the modified butadiene rubber comprises:

[0017] S1. Preparation of aldehyde-terminated polybutadiene rubber:

[0018] Dissolving butadiene rubber powder in cyclohexane and treating it with m-chloroperbenzoic acid to prepare epoxidized polybutadiene rubber; then dissolving the epoxidized polybutadiene rubber in tetrahydrofuran and treating it with periodic acid to obtain aldehyde-terminated polybutadiene rubber;

[0019] S2. Preparation of amide tantalum diboride:

[0020] Dispersing tantalum diboride powder in anhydrous ethanol, adding γ-aminopropyltrimethoxysilane, and performing reflux treatment to obtain amino tantalum diboride;

[0021] S3. Preparation of modified butadiene rubber:

[0022] Add the aldehyde-terminated polybutadiene rubber to toluene, stir thoroughly until uniform, then add 5-aminobenzotriazole and amino tantalum diboride, stir thoroughly again, then heat to 85-105°C, keep stirring under the action of a catalyst for 6-12 hours, after the reaction is completed, remove the solvent under reduced pressure, wash three times with ethanol, and dry under reduced pressure to obtain modified butadiene rubber.

[0023] Preferably, the S1 step specifically includes:

[0024] a. Preparation of epoxidized polybutadiene rubber:

[0025] Adding butadiene rubber powder to cyclohexane and stirring until completely dissolved to obtain a butadiene rubber solution; adding meta-chloroperbenzoic acid to the butadiene rubber solution, mixing thoroughly, and stirring at 20-60° C. for 4-6 hours. After the reaction is completed, using a solvent for precipitation, and then collecting and drying the precipitate to obtain epoxidized polybutadiene rubber;

[0026] b. Preparation of aldehyde-terminated polybutadiene rubber:

[0027] The epoxidized polybutadiene rubber and tetrahydrofuran are mixed and stirred until completely dissolved, and then periodic acid is added and stirred at 20-40° C. for 1-3 hours. The solvent is removed under reduced pressure, and the mixture is washed with water for at least three times and dried in vacuo to obtain the aldehyde-terminated polybutadiene rubber.

[0028] More preferably, in step a, the brand of the butadiene rubber powder is BR9000, and the particle size is 0.5-1 mm.

[0029] More preferably, in step a, the mass volume ratio of butadiene rubber powder, meta-chloroperbenzoic acid and cyclohexane is 1 g:(0.03-0.05) g:(10-20) mL.

[0030] More preferably, in step a, the reaction solution needs to be placed in ice water to cool down before using the solvent for precipitation, and then poured into anhydrous ethanol with a volume 2-3 times that of the reaction solution for precipitation.

[0031] More preferably, in step a, the precipitate is collected and washed three times with alcohol, and the drying is vacuum drying.

[0032] More preferably, in step b, the mass volume ratio of epoxidized polybutadiene rubber, periodic acid and tetrahydrofuran is 1 g: (0.02-0.04) g: (10-20) mL.

[0033] Preferably, the S2 step specifically includes:

[0034] Tantalum diboride powder is mixed in anhydrous ethanol and dispersed evenly under ultrasonic conditions. γ-aminopropyltrimethoxysilane is then added dropwise and the mixture is refluxed and stirred at 70-80° C. for 5-10 hours. After the treatment, the mixture is filtered, washed and dried to obtain amino tantalum diboride.

[0035] More preferably, in step S2, the purity of the tantalum diboride powder is higher than 99%, and the particle size is 50-60 μm.

[0036] More preferably, in step S2, the mass volume ratio of tantalum diboride powder, γ-aminopropyltrimethoxysilane and anhydrous ethanol is 1 g: (0.2-0.4) g: (10-20) mL.

[0037] Preferably, in step S3, the catalyst is glacial acetic acid, and the amount of the catalyst added is 2%-8% of the mass of the aldehyde-terminated polybutadiene rubber.

[0038] Preferably, in step S3, the mass volume ratio of the aldehyde-terminated polybutadiene rubber, 5-aminobenzotriazole, aminoated tantalum diboride and toluene is 100 g: (1.5-2.8) g: (3-8) g: (1000-2000) mL.

[0039] In a second aspect, the present invention provides a method for preparing a corrosion-resistant synchronous belt, comprising the following steps:

[0040] Step 1, weighing EPDM rubber, modified cis-1,4-butadiene rubber, styrene-butadiene rubber and fluororubber according to parts by weight, mixing them in an internal mixer, and mixing them at 160-170° C. for 10-20 minutes;

[0041] Step 2: Cool the internal mixer in step 1 to 120-140° C., add carbon black, antioxidant and lubricant, and continue mixing for 8-16 minutes;

[0042] Step 3: Add a vulcanizing agent and a vulcanization accelerator into an internal mixer, and perform a vulcanization treatment at 120-150° C. and 6-10 MPa for 20-30 minutes to obtain a corrosion-resistant synchronous belt.

[0043] The beneficial effects of the present invention are:

[0044] The present invention prepares a synchronous belt using a composite of various rubbers as its primary raw material, including EPDM rubber, modified cis-1,4-butadiene rubber, styrene-butadiene rubber, and fluororubber. Carbon black is added as a reinforcing filler, and antioxidants and lubricants are also added as additives. Compared to commercially available rubber synchronous belts, the synchronous belt material prepared by the present invention exhibits the advantages of high strength, high temperature resistance, wear resistance, and chemical corrosion resistance.

[0045] 2. The biggest difference between the synchronous belt components of the present invention and conventional rubber synchronous belts is that the traditional cis-1, ...

[0046] 3. In the process of preparing the modified butadiene rubber of the present invention, the butadiene rubber is first subjected to epoxidation and formylation treatments in sequence to obtain an aldehyde-terminated polybutadiene rubber. Then, a mixture of 5-aminobenzotriazole and amino-treated tantalum diboride is used as a modifier to undergo an amine-aldehyde condensation reaction with the aldehyde-terminated polybutadiene rubber, ultimately yielding a composite material containing a Schiff base, benzotriazole groups, and tantalum diboride, namely, the modified butadiene rubber. Subsequent testing of the present invention has revealed that, in applications as a synchronous belt material, the modified butadiene rubber exhibits superior performance compared to conventional butadiene rubber in terms of strength and hardness, as well as high-temperature resistance and corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The present invention is further described with reference to the accompanying drawings. However, the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative effort.

[0048] Figure 1 Schematic diagram of infrared spectrum (FTIR) of modified butadiene rubber and aldehyde-terminated polybutadiene rubber prepared in Example 1 of the present invention;

[0049] Figure 2 This is a product schematic diagram of the material of the corrosion-resistant synchronous belt prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is described below through specific examples. It should be understood that the one or more method steps mentioned in the present invention do not exclude the presence of other method steps before and after the combination step or the insertion of other method steps between these explicitly mentioned steps; it should also be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or to define the scope of the present invention. Changes or adjustments in their relative relationships, without substantially changing the technical content, should also be regarded as the scope of the present invention.

[0051] In order to better understand the above technical solutions, exemplary embodiments of the present invention are described in more detail below. Although exemplary embodiments of the present invention are shown, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0052] The present invention will be further described below with reference to the following examples. Example 1

[0053] A corrosion-resistant synchronous belt, the components of which are calculated by weight and include:

[0054] 100 parts of EPDM rubber, 44 parts of modified cis-1,4-butadiene rubber, 35 parts of styrene-butadiene rubber, 6 parts of fluororubber, 30 parts of carbon black, 1.9 parts of antioxidant, 2 parts of lubricant, 0.9 parts of vulcanizing agent and 3.3 parts of vulcanization accelerator.

[0055] The brand of EPDM rubber is EPDM 3722P; the brand of styrene-butadiene rubber is SBR 1502; the brand of fluororubber is FPM 26; the carbon black is carbon black N550; the antioxidant is antioxidant 4010NA; the lubricant is stearic acid; the vulcanizing agent is sulfur; and the vulcanization accelerator is vulcanization accelerator TMTD.

[0056] The preparation method of modified butadiene rubber comprises:

[0057] S1. Preparation of aldehyde-terminated polybutadiene rubber:

[0058] BR9000 butadiene rubber was crushed into particles of 0.5-1 mm in size, added to cyclohexane, and stirred until completely dissolved. Then, m-chloroperbenzoic acid was added, and the mass volume ratio of butadiene rubber powder, m-chloroperbenzoic acid, and cyclohexane was 1 g:0.04 g:15 mL. After being fully mixed, the mixture was stirred and reacted at 40° C. for 4 h. After the reaction was completed, the reaction solution was placed in ice water to cool, and then poured into anhydrous ethanol 3 times the volume of the reaction solution. The precipitate was collected, washed with alcohol three times, and vacuum dried to obtain epoxidized polybutadiene rubber;

[0059] Mix epoxidized polybutadiene rubber and tetrahydrofuran, stir until completely dissolved, then add periodic acid, the mass volume ratio of epoxidized polybutadiene rubber, periodic acid and tetrahydrofuran is 1g:0.03g:15mL, stir and react at 30°C for 2h, remove the solvent under reduced pressure, wash with water at least three times, and vacuum dry to obtain terminal aldehyde polybutadiene rubber.

[0060] S2. Preparation of amide tantalum diboride:

[0061] Tantalum diboride powder (purity > 99%, particle size 50-60 μm) was mixed in anhydrous ethanol and dispersed uniformly under ultrasonic conditions. γ-aminopropyltrimethoxysilane was then added dropwise in a mass volume ratio of 1 g:0.3 g:15 mL of anhydrous ethanol. The mixture was refluxed and stirred at 75°C for 8 h. After the treatment, the precipitate was collected by filtration, washed three times with alcohol, and dried in vacuo to obtain amino tantalum diboride.

[0062] S3. Preparation of modified butadiene rubber:

[0063] Add the aldehyde-terminated polybutadiene rubber to toluene, stir thoroughly until uniform, then add 5-aminobenzotriazole and tantalum diboride, the mass volume ratio of the aldehyde-terminated polybutadiene rubber, 5-aminobenzotriazole, tantalum diboride and toluene is 100g:2.1g:5g:1500mL, stir thoroughly again, then heat to 95°C, keep reflux and stir for 9h under the action of glacial acetic acid, the amount of glacial acetic acid added is 5% of the mass of the aldehyde-terminated polybutadiene rubber, after the reaction is completed, remove the solvent under reduced pressure, wash with ethanol three times, and dry under reduced pressure to obtain modified butadiene rubber.

[0064] The method for preparing the above-mentioned corrosion-resistant synchronous belt comprises the following steps:

[0065] Step 1, weighing EPDM rubber, modified cis-1,4-butadiene rubber, styrene-butadiene rubber and fluororubber according to parts by weight, mixing them in an internal mixer, and mixing them at 165° C. for 15 minutes;

[0066] Step 2: Cool the internal mixer of step 1 to 130° C., add carbon black, antioxidant and lubricant, and continue mixing for 12 minutes;

[0067] Step 3: Add vulcanizing agent and vulcanization accelerator into the internal mixer, and vulcanize for 20-30 minutes at 135°C and 8MPa to obtain a corrosion-resistant synchronous belt. Figure 2 shown. Example 2

[0068] A corrosion-resistant synchronous belt, the components of which are calculated by weight and include:

[0069] 100 parts of EPDM rubber, 32 parts of modified cis-1,4-butadiene rubber, 45 parts of styrene-butadiene rubber, 4 parts of fluororubber, 38 parts of carbon black, 1.3 parts of antioxidant, 3 parts of lubricant, 0.6 parts of vulcanizing agent and 4.4 parts of vulcanization accelerator.

[0070] The brand of EPDM rubber is EPDM 3072EM; the brand of styrene-butadiene rubber is SBR 1516; the brand of fluororubber is FPM 246; the carbon black is carbon black N220; the antioxidant is antioxidant 3100; the lubricant is zinc stearate; the vulcanizing agent is sulfur; and the vulcanization accelerator is vulcanization accelerator M.

[0071] The preparation method of modified butadiene rubber comprises:

[0072] S1. Preparation of aldehyde-terminated polybutadiene rubber:

[0073] BR9000 butadiene rubber was crushed into particles of 0.5-1 mm in size, added to cyclohexane, and stirred until completely dissolved. Then, m-chloroperbenzoic acid was added, and the mass volume ratio of butadiene rubber powder, m-chloroperbenzoic acid, and cyclohexane was 1 g:0.03 g:10 mL. After being fully mixed, the mixture was stirred and reacted at 20°C for 4 hours. After the reaction was completed, the reaction solution was placed in ice water to cool, and then poured into anhydrous ethanol with a volume twice that of the reaction solution. The precipitate was collected, washed with alcohol three times, and vacuum dried to obtain epoxidized polybutadiene rubber;

[0074] Epoxidized polybutadiene rubber and tetrahydrofuran were mixed and stirred until completely dissolved, and then periodic acid was added. The mass volume ratio of epoxidized polybutadiene rubber, periodic acid and tetrahydrofuran was 1 g:0.02 g:10 mL. The mixture was stirred and reacted at 20°C for 1 hour. The solvent was removed under reduced pressure, and the mixture was washed with water at least three times and dried in vacuo to obtain aldehyde-terminated polybutadiene rubber.

[0075] S2. Preparation of amide tantalum diboride:

[0076] Tantalum diboride powder (purity > 99%, particle size 50-60 μm) was mixed in anhydrous ethanol and dispersed uniformly under ultrasonic conditions. γ-aminopropyltrimethoxysilane was then added dropwise in a mass volume ratio of 1 g:0.2 g:10 mL of anhydrous ethanol. The mixture was refluxed and stirred at 70°C for 5 h. After the treatment, the precipitate was collected by filtration, washed three times with alcohol, and dried in vacuo to obtain ammoniated tantalum diboride.

[0077] S3. Preparation of modified butadiene rubber:

[0078] Add the aldehyde-terminated polybutadiene rubber to toluene, stir thoroughly until uniform, then add 5-aminobenzotriazole and tantalum diboride, the mass volume ratio of the aldehyde-terminated polybutadiene rubber, 5-aminobenzotriazole, tantalum diboride and toluene is 100g:1.5g:3g:1000mL, stir thoroughly again, then heat to 85°C, and stir under the action of glacial acetic acid for 6 hours. The amount of glacial acetic acid added is 2% of the mass of the aldehyde-terminated polybutadiene rubber. After the reaction is completed, remove the solvent under reduced pressure, wash with ethanol three times, and dry under reduced pressure to obtain modified butadiene rubber.

[0079] The method for preparing the above-mentioned corrosion-resistant synchronous belt comprises the following steps:

[0080] Step 1, weighing EPDM rubber, modified cis-1,4-butadiene rubber, styrene-butadiene rubber and fluororubber according to parts by weight, mixing them in an internal mixer, and mixing them at 160° C. for 10 minutes;

[0081] Step 2: Cool the internal mixer of step 1 to 120° C., add carbon black, antioxidant and lubricant, and continue mixing for 8 minutes;

[0082] Step 3: Add a vulcanizing agent and a vulcanization accelerator into an internal mixer, and perform a vulcanization treatment at 120° C. and 6 MPa for 20-30 minutes to obtain a corrosion-resistant synchronous belt. Example 3

[0083] A corrosion-resistant synchronous belt, the components of which are calculated by weight and include:

[0084] 100 parts of EPDM rubber, 56 parts of modified cis-1,4-butadiene rubber, 25 parts of styrene-butadiene rubber, 8 parts of fluororubber, 22 parts of carbon black, 2.6 parts of antioxidant, 1 part of lubricant, 1.2 parts of vulcanizing agent and 2.2 parts of vulcanization accelerator.

[0085] The brand of EPDM rubber is EPDM 4045M; the brand of styrene-butadiene rubber is SBR 1712; the brand of fluororubber is FPM 26; the carbon black is carbon black N330; the antioxidant is antioxidant 4020; the lubricant is magnesium stearate; the vulcanizing agent is sulfur; and the vulcanization accelerator is vulcanization accelerator CZ.

[0086] The preparation method of modified butadiene rubber comprises:

[0087] S1. Preparation of aldehyde-terminated polybutadiene rubber:

[0088] BR9000 butadiene rubber was crushed into particles of 0.5-1 mm in size, added to cyclohexane, and stirred until completely dissolved. Then, m-chloroperbenzoic acid was added, and the mass volume ratio of butadiene rubber powder, m-chloroperbenzoic acid, and cyclohexane was 1 g:0.05 g:20 mL. After being fully mixed, the mixture was stirred and reacted at 60° C. for 6 h. After the reaction was completed, the reaction solution was placed in ice water to cool, and then poured into anhydrous ethanol 3 times the volume of the reaction solution. The precipitate was collected, washed with alcohol three times, and vacuum dried to obtain epoxidized polybutadiene rubber;

[0089] Mix epoxidized polybutadiene rubber and tetrahydrofuran, stir until completely dissolved, then add periodic acid, the mass volume ratio of epoxidized polybutadiene rubber, periodic acid and tetrahydrofuran is 1g:0.04g:20mL, stir and react at 40°C for 3h, remove the solvent under reduced pressure, wash with water at least three times, and vacuum dry to obtain terminal aldehyde polybutadiene rubber.

[0090] S2. Preparation of amide tantalum diboride:

[0091] Tantalum diboride powder (purity > 99%, particle size 50-60 μm) was mixed in anhydrous ethanol and dispersed uniformly under ultrasonic conditions. γ-aminopropyltrimethoxysilane was then added dropwise in a mass volume ratio of 1 g:0.4 g:20 mL of anhydrous ethanol. The mixture was refluxed and stirred at 80°C for 10 hours. After the treatment, the precipitate was collected by filtration, washed three times with alcohol, and dried in vacuo to obtain ammoniated tantalum diboride.

[0092] S3. Preparation of modified butadiene rubber:

[0093] Add the aldehyde-terminated polybutadiene rubber to toluene, stir thoroughly until uniform, then add 5-aminobenzotriazole and tantalum diboride, the mass volume ratio of the aldehyde-terminated polybutadiene rubber, 5-aminobenzotriazole, tantalum diboride and toluene is 100g:2.8g:8g:2000mL, stir thoroughly again, then heat to 105°C, and stir under the action of glacial acetic acid for 12 hours, the amount of glacial acetic acid added is 8% of the mass of the aldehyde-terminated polybutadiene rubber. After the reaction is completed, remove the solvent under reduced pressure, wash with ethanol three times, and dry under reduced pressure to obtain modified butadiene rubber.

[0094] The method for preparing the above-mentioned corrosion-resistant synchronous belt comprises the following steps:

[0095] Step 1, weighing EPDM rubber, modified cis-1,4-butadiene rubber, styrene-butadiene rubber and fluororubber according to parts by weight, mixing them in an internal mixer, and mixing them at 170° C. for 20 minutes;

[0096] Step 2: Cool the internal mixer of step 1 to 140° C., add carbon black, antioxidant and lubricant, and continue mixing for 16 minutes;

[0097] Step 3: Add a vulcanizing agent and a vulcanization accelerator into an internal mixer, and perform a vulcanization treatment at 150° C. and 10 MPa for 30 minutes to obtain a corrosion-resistant synchronous belt.

[0098] Comparative Example 1

[0099] A synchronous belt, which differs from Example 1 only in that the modified butadiene rubber in the synchronous belt composition is replaced by conventional BR9000 butadiene rubber.

[0100] Comparative Example 2

[0101] A synchronous belt, which differs from Example 1 only in that the modified butadiene rubber in the synchronous belt components is replaced by aldehyde-terminated polybutadiene rubber.

[0102] Comparative Example 3

[0103] A synchronous belt differs from Example 1 only in that the modified butadiene rubber in the synchronous belt components is replaced by a mixture of BR9000 butadiene rubber, tantalum diboride, and 5-aminobenzotriazole, wherein the mass ratio of butadiene rubber, 5-aminobenzotriazole, and tantalum diboride is 100:2.1:5.

[0104] In order to explain the present invention more clearly, the present invention has carried out corresponding tests on samples:

[0105] 1. Infrared spectrum detection:

[0106] from Figure 1 It can be seen from the infrared spectrum that the modified butadiene rubber prepared in Example 1 has an infrared spectrum of 1123 cm -1 The stretching vibration peak of -CN appeared at 1625cm -1 The stretching vibration peak of -C=N imine group appeared at 1729cm, which is the typical stretching vibration peak of Schiff base, indicating the formation of Schiff base. -1 The stretching vibration peak of -C=O appeared at 3338cm -1 The stretching vibration peak of -NH appears at 1520 cm -1 The stretching vibration peak of the benzene ring group appears at , indicating that benzotriazole is introduced. In summary, it can be seen that Example 1 of the present invention prepares the modified butadiene rubber by using terminal aldehyde polybutadiene rubber.

[0107] 2. Performance testing:

[0108] The present invention also conducted performance tests on the synchronous belt materials prepared in Example 1 and Comparative Examples 1-3. The test contents include the following:

[0109] (1) The tensile strength test reference standard is GB / T 528-2009;

[0110] (2) Shore (A) hardness test reference standard GB / T531.1-2008;

[0111] (3) The test reference standard for wear resistance (wear volume) is GB / T 1689-2014 (load 26.7N±0.2N);

[0112] (4) High temperature resistance: The material blocks were placed at 180°C for 24 hours, then cooled to room temperature, and the change rate of tensile strength was tested;

[0113] (5) Acid resistance: Cut the material into pieces and soak them in 20 wt% hydrochloric acid for 72 h. After taking them out, wash them, dry them, and then test the change rate of tensile strength.

[0114] (6) Alkali resistance: Cut the material into pieces and soak them in 20wt% sodium hydroxide solution for 72h. After taking them out, wash them, dry them, and then test the change rate of tensile strength.

[0115] The test results are shown in Table 1:

[0116] Table 1 Performance test results of different synchronous belt materials

[0117] Tensile strength (MPa) Shore A hardness <![CDATA[Akhron abrasion volume (cm 3 )]]> Change rate of tensile strength after high temperature treatment Change rate of tensile strength after acid treatment Change rate of tensile strength after alkali treatment Example 1 27.5 85 0.18 -3.9% -2.8% -4.3% Comparative Example 1 20.2 73 0.47 -8.2% -6.7% -9.4% Comparative Example 2 18.4 71 0.52 -11.5% -9.6% -12.1% Comparative Example 3 22.3 78 0.40 -7.4% -7.1% -8.5%

[0118] It can be seen from Table 1 that the synchronous belt material prepared in Example 1 of the present invention has higher strength and hardness, and also has better wear resistance, high temperature resistance, and acid and alkali corrosion resistance. In summary, it can be proved that the synchronous belt material prepared in Example 1 of the present invention has the advantages of high strength, high temperature resistance, wear resistance and chemical corrosion resistance.

[0119] In the description of this specification, reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0120] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A corrosion-resistant synchronous belt, characterized in that: Ingredients are calculated in parts by weight and include: 100 parts of EPDM rubber, 32-56 parts of modified cis-1,4-butadiene rubber, 25-45 parts of styrene-butadiene rubber, 4-8 parts of fluororubber, 22-38 parts of carbon black, 1.3-2.6 parts of antioxidant, 1-3 parts of lubricant, 0.6-1.2 parts of vulcanizing agent and 2.2-4.4 parts of vulcanization accelerator; The preparation method of the modified butadiene rubber comprises: S1. Dissolving butadiene rubber powder in cyclohexane and treating it with m-chloroperbenzoic acid to obtain epoxidized polybutadiene rubber; then dissolving the epoxidized polybutadiene rubber in tetrahydrofuran and treating it with periodic acid to obtain aldehyde-terminated polybutadiene rubber; S2. Dispersing tantalum diboride powder in anhydrous ethanol, adding γ-aminopropyltrimethoxysilane, and performing reflux treatment to obtain amination of tantalum diboride; S3. Add the aldehyde-terminated polybutadiene rubber to toluene, stir thoroughly until uniform, then add 5-aminobenzotriazole and amino tantalum diboride, stir thoroughly again, then heat to 85-105°C, keep stirring under the action of a catalyst for 6-12 hours, after the reaction is completed, remove the solvent under reduced pressure, wash three times with ethanol, and dry under reduced pressure to obtain modified butadiene rubber.

2. The corrosion-resistant synchronous belt according to claim 1, characterized in that: The brand of the EPDM rubber is at least one of EPDM 3722P, EPDM 3072EM, and EPDM 4045M; the brand of the styrene-butadiene rubber is at least one of SBR 1502, SBR 1516, SBR 1706, and SBR 1712; and the brand of the fluororubber is FPM 26 or FPM 246.

3. The corrosion-resistant synchronous belt according to claim 1, characterized in that: The carbon black is at least one of carbon black N220, carbon black N330, and carbon black N550.

4. The corrosion-resistant synchronous belt according to claim 1, characterized in that: The antioxidant is at least one of antioxidant 3100, antioxidant 4010, antioxidant 4010NA, and antioxidant 4020; and the lubricant is at least one of stearic acid, zinc stearate, and magnesium stearate.

5. The corrosion-resistant synchronous belt according to claim 1, characterized in that: The vulcanizing agent is sulfur; the vulcanization accelerator is at least one of vulcanization accelerator M, vulcanization accelerator TMTD, vulcanization accelerator CZ, and vulcanization accelerator NS.

6. The corrosion-resistant synchronous belt according to claim 1, characterized in that: In the step S1, the mass volume ratio of butadiene rubber powder, meta-chloroperbenzoic acid and cyclohexane is 1g:(0.03-0.05)g:(10-20)mL; the mass volume ratio of epoxidized polybutadiene rubber, periodic acid and tetrahydrofuran is 1g:(0.02-0.04)g:(10-20)mL.

7. The corrosion-resistant synchronous belt according to claim 1, characterized in that: In step S2, the mass volume ratio of tantalum diboride powder, γ-aminopropyltrimethoxysilane and anhydrous ethanol is 1 g: (0.2-0.4) g: (10-20) mL.

8. The corrosion-resistant synchronous belt according to claim 1, characterized in that: In step S3, the catalyst is glacial acetic acid, and the amount of the catalyst added is 2%-8% of the mass of the terminal aldehyde polybutadiene rubber; the mass volume ratio of the terminal aldehyde polybutadiene rubber, 5-aminobenzotriazole, amino tantalum diboride and toluene is 100g:(1.5-2.8)g:(3-8)g:(1000-2000)mL.

9. A method for preparing the corrosion-resistant synchronous belt according to claim 1, characterized in that: The following steps are involved: Step 1, weighing EPDM rubber, modified cis-1,4-butadiene rubber, styrene-butadiene rubber and fluororubber according to parts by weight, mixing them in an internal mixer, and mixing them at 160-170° C. for 10-20 minutes; Step 2: Cool the internal mixer in step 1 to 120-140° C., add carbon black, antioxidant and lubricant, and continue mixing for 8-16 minutes; Step 3: Add a vulcanizing agent and a vulcanization accelerator into an internal mixer, and perform a vulcanization treatment at 120-150° C. and 6-10 MPa for 20-30 minutes to obtain a corrosion-resistant synchronous belt.

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