Brominated butyl rubber composition for slurry pump and preparation method and application thereof

Abstract

The present invention relates to a brominated butyl rubber composition for a slurry pump, a preparation method thereof and an application thereof, wherein the brominated butyl rubber composition comprises the following components by weight: 78-82 parts of brominated butyl rubber; 18-22 parts of butyl rubber; 0.4-0.6 parts of MgO; 0.8-1.2 parts of PEG4000; 38-42 parts of carbon black; 2.2-2.8 parts of paraffin oil; 4-6 parts of Deoflow S; 0.8-1.2 parts of zinc oxide; 0.8-1.2 parts of stearic acid; 1.0-2.0 parts of 2,2'-dithiodibenzothiazole; and 0.4-0.6 parts of sulfur. The present invention also provides a preparation method and application of the composition, a method for improving the scorch time of rubber, rubber and its preparation method and application thereof, and a slurry pump, wherein by adding Deoflow S to the rubber component, the scorch time can be significantly prolonged on the basis of improving or maintaining other physical properties in compliance with the requirements.

Description

Technical Field

[0001] The invention belongs to the field of manufacturing wear-resistant rubber parts, and in particular relates to a brominated butyl rubber composition for a slurry pump, a preparation method and an application thereof. Background Art

[0002] Rubber is widely used in industry, agriculture, aerospace, transportation and other fields due to its excellent properties such as high elasticity, high strength and high elongation. It is closely related to economic construction and people's lives. Scorch time and positive vulcanization time are two important indicators that need to be considered in the design and processing of rubber formulas. Different rubber products have different requirements for scorch time and positive vulcanization time, and the length of scorch time is directly related to the operational safety, storage period and fluidity of the rubber during processing. Specifically, the longer the scorch time, the better the stability of the rubber before processing, the higher the operational safety, and the longer the storage period of the rubber. On the contrary, too short a scorch time may cause early vulcanization of the rubber during processing, thereby affecting the fluidity and processing safety of the rubber. Among them, brominated butyl rubber or butyl rubber has a highly saturated main chain, so quasi-superspeed and superspeed accelerators are needed during vulcanization to give the rubber good physical properties and suitable vulcanization efficiency, and its products have the problem of too short scorch time during vulcanization, which affects processing safety. Therefore, it is necessary to extend the scorch time as much as possible without affecting the vulcanization rate and physical properties.

[0003] In the mining industry, during the process of extracting valuable metal elements from ores through acid leaching, the ore is first crushed into small particles and then mixed with an acidic solution. The hydrogen ions in the acidic solution will react chemically with the metal elements in the ore to form water-soluble metal salts, and then the pure metal can be separated from the solution through filtration, precipitation, electrolysis and other methods. Therefore, during the acid leaching process, the flow-through parts of the slurry pump will be corroded by the acidic slurry during the slurry transportation process, and the flow-through parts made of metal will fail due to acid corrosion, making them unable to meet the use requirements. Therefore, it is necessary to improve the corrosion resistance of the rubber lining of the slurry pump under acidic conditions. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a brominated butyl rubber composition, wherein the brominated butyl rubber composition comprises the following components in parts by weight:

[0005] Bromobutyl rubber 70-90 parts

[0006] Butyl rubber 10-30 parts

[0007] Anti-scorch agent 1.0-2.0 parts

[0008] Carbon black 30-50 parts

[0009] 2-3 parts paraffin oil

[0010] Dispersant Deoflow S 0.5-10 parts

[0011] Zinc oxide 0.5-1.5 parts

[0012] Stearic acid 0.5-1.5 parts

[0013] Accelerator 1.0-2.0 parts

[0014] Sulfur 0.25-0.75 parts.

[0015] According to an embodiment of the present invention, the brominated butyl rubber is preferably BIIR2222 type brominated butyl rubber. For example, the weight parts of the brominated butyl rubber can be 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89 or 90 parts.

[0016] According to an embodiment of the present invention, the butyl rubber is preferably IIR268 type butyl rubber. For example, the weight parts of the butyl rubber can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29 or 30 parts.

[0017] According to an embodiment of the present invention, the scorch retarder is one of MgO and polyethylene glycol, or a mixture of MgO and polyethylene glycol.

[0018] According to an embodiment of the present invention, the molecular weight of the polyethylene glycol may be 1000-6000, such as PEG1000, PEG2000, PEG3000, PEG4000, PEG5000 or PEG6000, for example, PEG4000.

[0019] According to an embodiment of the present invention, the weight portion of the anti-scorch agent may be 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2.0 parts in total. For example, when the anti-scorch agent is a mixture of MgO and polyethylene glycol, the weight portion of MgO may be 0.25-0.75 parts, such as 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70 or 0.75 parts; the weight portion of polyethylene glycol may be 0.75-1.25 parts, such as 0.75, 1.0 or 1.25 parts.

[0020] According to an embodiment of the present invention, the weight parts of the carbon black may be 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49 or 50 parts.

[0021] According to an embodiment of the present invention, the weight parts of the paraffin oil can be 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3 parts.

[0022] According to an embodiment of the present invention, the weight portion of the dispersant Deoflow S can be 0.5, 1.0, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10 parts.

[0023] According to an embodiment of the present invention, the weight portion of zinc oxide may be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4 or 1.5 parts.

[0024] According to an embodiment of the present invention, the weight portion of stearic acid may be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4 or 1.5 parts.

[0025] According to an embodiment of the present invention, the accelerator may be at least one of a thiazole accelerator, a sulfonamide accelerator, a thiuram accelerator, a dithiocarbamate accelerator, a guanidine accelerator and DTDM (dimorpholine disulfide). For example, the thiazole accelerator includes at least one of accelerator M (2-mercaptobenzothiazole), accelerator DM (2,2'-dithiobenzothiazole), and accelerator MZ (2-mercaptobenzothiazole zinc salt); the sulfonamide accelerator includes accelerator CZ (N-cyclohexyl-2-benzothiazole sulfonamide), accelerator NOBS (2-(4-morpholinethio)benzothiazole), accelerator AZ (diethylbenzothiazole sulfonamide), accelerator DZ ((4) N,N-dicyclohexyl-2-2benzothiazole sulfonamide), accelerator MBS (N-oxydiethylene). The accelerator comprises at least one of accelerator TMTM (tetramethylthiuram monosulfide), accelerator TMTD (tetramethylthiuram disulfide), and accelerator TETD (tetraethylthiuram disulfide); the dithiocarbamate accelerator comprises at least one of accelerator ZDEC (zinc diethyldithiocarbamate) and accelerator ZDMC (zinc dimethyldithiocarbamate); the guanidine accelerator is accelerator D (diphenylguanidine). For example, the weight of the accelerator can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2 parts.

[0026] According to an embodiment of the present invention, the weight portion of sulfur may be 0.25, 0.5 or 0.75 parts.

[0027] According to an embodiment of the present invention, the brominated butyl rubber composition comprises the following components in parts by weight:

[0028] 75-85 parts of brominated butyl rubber

[0029] Butyl rubber 15-25 parts

[0030] MgO 0.25-0.75 parts

[0031] PEG4000 0.75-1.25 parts

[0032] Carbon black 35-45 parts

[0033] 2-3 parts paraffin oil

[0034] Deoflow S 4-6 parts

[0035] Zinc oxide 0.5-1.5 parts

[0036] Stearic acid 0.5-1.5 parts

[0037] 2,2'-Dibenzothiazole disulfide 1.0-2.0 parts

[0038] Sulfur 0.25-0.75 parts.

[0039] According to an embodiment of the present invention, the brominated butyl rubber composition comprises the following components in parts by weight:

[0040] Bromobutyl rubber 78-82 parts

[0041] Butyl rubber 18-22 parts

[0042] MgO 0.4-0.6 parts

[0043] PEG4000 0.8-1.2 parts

[0044] Carbon black 38-42 parts

[0045] Paraffin oil 2.2-2.8 parts

[0046] Deoflow S 4-6 parts

[0047] Zinc oxide 0.8-1.2 parts

[0048] Stearic acid 0.8-1.2 parts

[0049] 2,2'-Dibenzothiazole disulfide 1.0-2.0 parts

[0050] Sulfur 0.4-0.6 parts.

[0051] According to an embodiment of the present invention, the brominated butyl rubber composition comprises the following components in parts by weight: 80 parts of brominated butyl rubber, 20 parts of butyl rubber, 0.5 parts of MgO, 1 part of PEG 4000, 40 parts of carbon black, 2.5 parts of paraffin oil, 5 parts of Deoflow S, 1 part of zinc oxide, 1 part of stearic acid, 1.5 parts of accelerator, and 0.5 parts of sulfur. Alternatively, the brominated butyl rubber composition consists of the above components in parts by weight.

[0052] According to an exemplary embodiment of the present invention, the brominated butyl rubber composition comprises the following components by weight: 80 parts of brominated butyl rubber BIIR2222, 20 parts of butyl rubber IIR 268, 0.5 parts of MgO, 1 part of PEG 4000, 40 parts of carbon black, 2.5 parts of paraffin oil, 5 parts of Deoflow S, 1 part of zinc oxide, 1 part of stearic acid, 1.5 parts of accelerator DM, and 0.5 parts of sulfur. Alternatively, the brominated butyl rubber composition consists of the above components by weight.

[0053] According to an embodiment of the present invention, the brominated butyl rubber composition is a rubber composition for a corrosion-resistant slurry pump.

[0054] The present invention also provides a method for preparing the brominated butyl rubber composition, comprising mixing the above components according to the above parts by weight.

[0055] The present invention also provides the use of the above dispersant DeoflowS and / or the above brominated butyl rubber composition in improving the scorch time of rubber.

[0056] The present invention also provides a method for improving the scorch time of rubber, comprising adding the above dispersant and / or the above brominated butyl rubber composition during the rubber preparation process.

[0057] The present invention also provides a rubber obtained by kneading the brominated butyl rubber composition.

[0058] According to an embodiment of the present invention, the rubber is rubber for a slurry pump, preferably corrosion-resistant rubber for a corrosion-resistant slurry pump.

[0059] The present invention also provides a method for preparing the rubber, which comprises mixing the above components in proportion and kneading to obtain the rubber.

[0060] According to an embodiment of the present invention, the method for preparing rubber further comprises preheating the internal mixer. For example, the preheating temperature of the internal mixer is 80-120°C, exemplarily 100°C.

[0061] According to an embodiment of the present invention, the rubber preparation method further comprises rolling the rubber discharged from the internal mixer on a preheated open rubber mixer. For example, the temperature of the front roller of the preheated open rubber mixer is 50-55°C, and the temperature of the rear roller is 45-50°C.

[0062] According to an embodiment of the present invention, the method for preparing the rubber may include the following steps:

[0063] (1) Preheat the internal mixer;

[0064] (2) Putting the brominated butyl rubber and butyl rubber (cut into small pieces) into an internal mixer for mixing;

[0065] (3) Add the anti-scorching agent into an internal mixer for mixing;

[0066] (4) Add 1 / 2 of the carbon black into an internal mixer for mixing;

[0067] (5) Add the remaining 1 / 2 of the carbon black, paraffin oil and dispersant into an internal mixer for mixing;

[0068] (6) Add zinc oxide and stearic acid into an internal mixer, mix and discharge;

[0069] (7) The rubber material discharged from the internal mixer is wrapped on an open rubber mixer with the front roller preheated to 50-55℃ and the rear roller preheated to 45-50℃, ensuring that there is a small amount of residual rubber between the two rollers;

[0070] (8) Add accelerator and sulfur after rolling, and tap the rubber three times on each side;

[0071] (9) Adjust the roller distance, make triangle packs (for example, make triangle packs 5 times), then place the unloaded sheet aside, let it stand and cool, and obtain rubber.

[0072] According to an exemplary embodiment of the present invention, the method for preparing the rubber comprises performing the following steps according to the ratio of the above-mentioned brominated butyl rubber composition:

[0073] (1) Preheat the internal mixer to 100°C and 34 rpm;

[0074] (2) Put the bromobutyl rubber BIIR2222 and butyl rubber IIR 268 cut into small pieces into an internal mixer for mixing;

[0075] (3) Put MgO and PEG4000 into an internal mixer for mixing;

[0076] (4) Add 1 / 2 of the carbon black into an internal mixer for mixing;

[0077] (5) Add the remaining 1 / 2 of the carbon black, paraffin oil and Deoflow S into an internal mixer for mixing;

[0078] (6) Add zinc oxide and stearic acid into an internal mixer, mix and discharge;

[0079] (7) The rubber material discharged from the internal mixer is wrapped on an open rubber mixer with the front roller preheated to 50-55°C and the rear roller preheated to 45-50°C, ensuring that there is a small amount of residual rubber between the two rollers;

[0080] (8) After the roll is wrapped, add 2,2'-dibenzothiazole disulfide and sulfur, and tap the rubber three times on each side;

[0081] (9) Adjust the roller distance from 1.5-2 mm to 0.3-0.5 mm, make triangle packs 5 times and then put the sheet down and park, and let the mixed rubber stand and cool (e.g., for 24 hours) to obtain rubber.

[0082] The present invention also provides a method for improving the corrosion resistance of a slurry pump, comprising using a flow-through component made of the rubber.

[0083] The present invention also provides application of the rubber in a slurry pump, for example, the rubber is used to manufacture flow-through components of the slurry pump.

[0084] The present invention also provides a slurry pump, which comprises a flow-through component made of the rubber.

[0085] According to an embodiment of the present invention, the flow component may be selected from at least one of a liner, a jacket, an impeller, and a guard plate. Beneficial Effects

[0086] The flow-through parts of the rubber lining of the slurry pump are products with relatively thick cross-sections. Therefore, when the rubber is filled in the mold cavity, a longer scorch time is required to obtain good filling and avoid the appearance defects. Adding the dispersant Deoflow S used for filler dispersion to the rubber component can significantly prolong the scorch time while improving or maintaining other physical properties in compliance with the requirements. Therefore, the rubber composition of the present invention can ensure that the rubber is fully filled in the mold cavity to prevent the occurrence of defects such as shrinkage, thereby improving the performance and service life of the slurry pump components, especially the service life of the slurry pump lining under harsh working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0087] Figure 1 This is a real photo of rubber sample A3.

[0088] Figure 2 This is a real photo of rubber sample A1. DETAILED DESCRIPTION

[0089] The technical scheme of the present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present invention, and should not be construed as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope that the present invention is intended to protect.

[0090] Unless otherwise specified, the raw materials and reagents used in the following examples are commercially available or can be prepared by known methods.

[0091] The component abbreviations, grades or specifications used in this article are as follows:

[0092] Bromobutyl rubber: BIIR2222, ExxonMobil

[0093] Butyl rubber: IIR 268, ExxonMobil

[0094] MgO, Hebei Meishen Technology Co., Ltd.

[0095] PEG 4000: Lotte Group

[0096] Carbon black: Shanxi Sanqiang New Energy Technology Co., Ltd., -N220

[0097] Paraffin oil: Sunpar 2280, Sunoco Oil Company

[0098] Dispersant: Deoflow S, DOG, Germany (https: / / www.dog-chemie.de / en / additive-program / rubber-industry / processing-additives)

[0099] Accelerator: 2,2'-dibenzothiazole disulfide (DM), Kemai Chemical Co., Ltd.

[0100] The experimental equipment used in the following text are: internal mixer LN-1.5L, open rubber mixer XK-160, flat plate vulcanizer XLB-400x400, rotorless vulcanizer M-2000-AN, tensile testing machine AI-7000-S, roller abrasion machine GM-1, electronic balance JA203P, direct reading electronic density meter MDJ-300A, rubber hardness tester LX-A. Example 1

[0101] The preparation method of rubber samples A1-A4 comprises the following steps:

[0102] (1) Preheat the internal mixer to 100°C and 34 rpm.

[0103] (2) Put the bromobutyl rubber BIIR2222 and butyl rubber IIR 268 cut into small pieces into an internal mixer and mix for 1 minute.

[0104] (3) Add the anti-scorch agent MgO and PEG4000 into an internal mixer and mix for 1 minute.

[0105] (4) Add 1 / 2 of the carbon black into an internal mixer and mix for 1 minute.

[0106] (5) Add the remaining 1 / 2 amount of carbon black, paraffin oil and dispersant Deoflow S into an internal mixer and mix for 2 minutes.

[0107] (6) Add zinc oxide and stearic acid into an internal mixer and mix for 2 minutes before discharging.

[0108] (7) The rubber material discharged from the internal mixer is wrapped around an open rubber mixer with the front roller preheated to 50-55°C and the rear roller preheated to 45-50°C, ensuring that there is a small amount of residual rubber between the two rollers.

[0109] (8) After wrapping the roller, add DM accelerator and sulfur, and tap the rubber three times on each side.

[0110] (9) Adjust the roller distance from 1.5-2mm to 0.3-0.5mm, make triangle packs 5 times, and then put the sheet down and park. Let the mixed rubber stand and cool for 24 hours to obtain a rubber sample.

[0111] The specific composition of each sample is shown in Table 1 below, and the only difference is the amount of dispersant Deoflow S added:

[0112] Table 1

[0113]

[0114] Test Example 1: Fluidity and Scorch Time Test

[0115] Under the conditions of vulcanization temperature of 145°C and vulcanization time of 120 minutes, the fluidity and scorch time of samples A1-A4 were tested respectively. The results are shown in Table 2 below:

[0116] Table 2

[0117]

[0118] The above test results show that compared with sample A1 without adding Deoflow S, the fluidity of the rubber compounds of samples A2, A3 and A4 with the addition of Deoflow S (corresponding to ML in Table 2) is significantly improved, and the scorch time (corresponding to ts2 in Table 2) is also significantly prolonged.

[0119] Figure 1 This is a real photo of rubber sample A3. Figure 2 It is a real photo of rubber sample A1. It can be seen from the sample picture that the present invention improves the fluidity of the rubber and prolongs the scorch time by adding Deoflow S to the rubber, so that the rubber can be fully filled in the mold cavity, thereby greatly reducing the occurrence of shrinkage defects, and further can greatly prolong the life of the rubber during use.

[0120] Test Example 2: Mechanical properties test of samples A1-A4

[0121] Based on the above test results, the mechanical properties of samples A1-A4 were tested as follows:

[0122] Samples A1-A4 were prepared as follows: the thickness was 2 mm, and the curing time was the positive curing time tc90 + 5 minutes;

[0123] The hardness and elongation at break of the vulcanized samples were tested according to the following standards. The results are shown in Table 3 below:

[0124] Table 3

[0125]

[0126] The above test results show that, by adding Deoflow S to the rubber component, the obtained samples A2, A3 and A4 can significantly improve the elongation at break while maintaining the hardness not lower than A1.

[0127] Test Example 3: Wear performance test of the sample of the present invention

[0128] Based on the above test results, samples A2, A3 and A4 with better fluidity, scorch time and mechanical properties were selected for abrasion performance testing. The specific method is as follows:

[0129] Samples A2-A4 were prepared as follows: the thickness was 10 mm, and the curing time was the positive curing time tc90 + 10 minutes;

[0130] The vulcanized samples were subjected to roller wear index test according to the following standard, and the results are shown in Table 4 below:

[0131] Table 4

[0132]

[0133] After the content of Deoflow S was further increased to 10 parts by weight in sample A4, although the fluidity of the rubber compound was further improved and the scorch time was prolonged, it had no benefit on its physical properties. On the contrary, the roller wear index of samples A2 and A3 was significantly better than that of sample A4, achieving a more excellent wear resistance effect.

[0134] The above examples are used to illustrate the specific implementation of the present invention. However, the protection scope of the present invention is not limited to the above exemplary implementation. Any modification, equivalent substitution, improvement, etc. made by those skilled in the art within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A method for improving the scorch time of rubber, characterized in that: The rubber is obtained by kneading a brominated butyl rubber composition, wherein the brominated butyl rubber composition comprises the following components in parts by weight: 78-82 parts of brominated butyl rubber, 18-22 parts of butyl rubber, 0.4-0.6 parts of MgO, 0.8-1.2 parts of PEG4000, 38-42 parts of carbon black, 2.2-2.8 parts of paraffin oil, 4-6 parts of Deoflow S, 0.8-1.2 parts of zinc oxide, 0.8-1.2 parts of stearic acid, 1.0-2.0 parts of 2,2'-dithiodibenzothiazole, and 0.4-0.6 parts of sulfur.

2. The method according to claim 1, characterized in that The brominated butyl rubber composition comprises the following components in parts by weight: 80 parts of brominated butyl rubber, 20 parts of butyl rubber, 0.5 parts of MgO, 1 part of PEG4000, 40 parts of carbon black, 2.5 parts of paraffin oil, 5 parts of Deoflow S, 1 part of zinc oxide, 1 part of stearic acid, 1.5 parts of 2,2'-dithiodibenzothiazole, and 0.5 part of sulfur.

3. The method according to claim 1, characterized in that The composition comprises the following components in parts by weight: 80 parts of brominated butyl rubber BIIR2222, 20 parts of butyl rubber IIR 268, 0.5 parts of MgO, 1 part of PEG4000, 40 parts of carbon black, 2.5 parts of paraffin oil, 5 parts of Deoflow S, 1 part of zinc oxide, 1 part of stearic acid, 1.5 parts of 2,2'-dithiodibenzothiazole, and 0.5 part of sulfur.

4. The method according to any one of claims 1 to 3, characterized in that The method for preparing the brominated butyl rubber composition comprises mixing the components of the brominated butyl rubber composition according to any one of claims 1 to 3 in the aforementioned parts by weight.

5. The method according to claim 1, characterized in that The method for preparing the rubber comprises the following steps according to the proportion of the brominated butyl rubber composition in the method according to any one of claims 1 to 3: (1) Preheat the internal mixer; (2) Adding bromobutyl rubber and butyl rubber into an internal mixer for mixing; (3) Put MgO and PEG4000 into an internal mixer for mixing; (4) Add 1 / 2 of the carbon black into an internal mixer for mixing; (5) Add the remaining 1 / 2 of the carbon black, paraffin oil and Deoflow S into an internal mixer for mixing; (6) Add zinc oxide and stearic acid into an internal mixer, mix and discharge; (7) The rubber material discharged from the internal mixer is wrapped on an open rubber mixer with the front roller preheated to 50-55°C and the rear roller preheated to 45-50°C, ensuring that there is excess rubber between the two rollers; (8) After the roll is wrapped, add 2,2'-dibenzothiazole disulfide and sulfur, and tap the rubber three times on each side; (9) Adjust the roller distance from 1.5-2 mm to 0.3-0.5 mm, place the lower sheet at rest after triangulation, and allow the mixed rubber to stand and cool to obtain rubber.

6. The method according to claim 5, characterized in that The rubber is used to make a flow-through component of a slurry pump, and the flow-through component is selected from at least one of a liner, a sleeve, an impeller, and a guard plate.

7. The method according to claim 6, characterized in that The slurry pump comprises a flow-through component made of the rubber in the method according to any one of claims 1 to 3, and the flow-through component is selected from at least one of a liner, a jacket, an impeller, and a guard plate.

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