A high wear-resistant rubber track material and its preparation method

Abstract

This invention belongs to the field of new material preparation technology, specifically disclosing a high-wear-resistant rubber track material and its preparation method. The high-wear-resistant rubber track material, by weight, is prepared from the following raw materials: 60-100 parts nitrile rubber, 20-50 parts NV rubber-plastic alloy, 30-80 parts silica, 10-30 parts kaolin, 5-20 parts dioctyl terephthalate, 1-8 parts zinc oxide, 0.5-2 parts stearic acid, 0.5-5 parts antioxidant, 0.5-2 parts microcrystalline wax, 1-5 parts PEG4000, 0.5-5 parts coupling agent, 0.5-2 parts vulcanizing agent, and 2-8 parts accelerator. The rubber track material provided by this invention is mainly composed of NBR+PVC blend material. By combining functional additives and optimizing the preparation process, the prepared material is suitable for making tracks, meeting the requirements of wear resistance, no black mark, and excellent overall performance.

Description

Technical Field

[0001] This invention belongs to the field of new material preparation technology, specifically relating to a high wear-resistant rubber track material and its preparation method. Background Technology

[0002] Rubber tracks, as crucial running gear in construction machinery, agricultural machinery, and special vehicles, are widely used in excavators, harvesters, tracked transporters, and military equipment. Compared to traditional metal tracks, rubber tracks offer advantages such as lighter weight, reduced vibration and noise, less damage to the ground, and smoother travel. However, under complex working conditions (such as gravel roads, muddy environments, and high loads), rubber tracks are subjected to repeated bending, stretching, compression, and friction over extended periods, making them highly susceptible to wear, cracking, tearing, and delamination, severely impacting their service life and the reliability of equipment operation.

[0003] Currently, rubber tracks typically use natural rubber (NR) or styrene-butadiene rubber (SBR) as the main material, combined with reinforcing fillers such as carbon black to improve mechanical properties and wear resistance. However, this type of material system has certain limitations in terms of oil resistance, aging resistance, and heat resistance, especially under oily environments or high-temperature conditions, where performance degradation is more pronounced. Nitrile rubber (NBR), due to the presence of polar nitrile groups in its molecular structure, possesses excellent oil resistance, wear resistance, and aging resistance, and is increasingly being used in high-requirement rubber products. However, its processing performance, low-temperature performance, and dynamic fatigue performance still need to be optimized through blending modification.

[0004] On the other hand, with the deepening research on precipitated silica reinforcing systems, precipitated silica, due to its large specific surface area, tunable structure, and significant reinforcing effect, is widely used to improve the wear resistance and tear resistance of rubber materials. However, precipitated silica is rich in hydroxyl groups on its surface, exhibiting strong polarity, resulting in poor compatibility with non-polar or weakly polar rubber matrices. This leads to agglomeration and uneven dispersion, thus affecting the overall material performance. Therefore, silane coupling agents are typically introduced to improve interfacial bonding, enhance filler dispersibility, and increase reinforcing efficiency. However, the reaction conditions (such as temperature and time) and process control are quite stringent.

[0005] Furthermore, to further improve the overall performance of rubber track materials, rubber-plastic alloy systems (such as NBR and thermoplastic resin blends) have been gradually introduced in recent years to balance the elasticity of rubber with the strength and wear resistance of plastics. However, such systems are prone to problems such as phase separation, uneven dispersion, and narrow processing window during the mixing process, which places higher demands on process control.

[0006] In existing technologies, although increasing the amount of filler or introducing various additives can improve wear resistance to some extent, it often leads to problems such as decreased processing performance, deteriorated dynamic performance, or insufficient aging resistance. At the same time, some processes fail to effectively control the dispersion and coupling reaction of silica, resulting in large fluctuations in material properties, making it difficult to meet the comprehensive requirements of rubber tracks for wear resistance, tear resistance, and durability under high-strength working conditions.

[0007] Therefore, developing a high-wear-resistant rubber track material based on nitrile rubber, through the rational introduction of rubber-plastic alloys, optimization of the silica reinforcement system, and scientific preparation process, is of great significance for improving the service life and reliability of rubber tracks.

[0008] In view of this, the present invention is proposed. Summary of the Invention

[0009] To address the shortcomings of existing technologies, the present invention aims to provide a high wear-resistant rubber track material and its preparation method, which exhibits good wear resistance and excellent overall performance.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a high wear-resistant rubber track material, which is prepared by weight from the following raw materials: 60-100 parts of nitrile rubber, 20-50 parts of NV rubber-plastic alloy, 30-80 parts of silica, 10-30 parts of kaolin, 5-20 parts of dioctyl terephthalate, 1-8 parts of zinc oxide, 0.5-2 parts of stearic acid, 0.5-5 parts of antioxidant, 0.5-2 parts of microcrystalline wax, 1-5 parts of PEG4000, 0.5-5 parts of coupling agent, 0.5-2 parts of vulcanizing agent, and 2-8 parts of accelerator.

[0011] As a preferred embodiment of the present invention, the high wear-resistant rubber track material, by weight, is prepared from the following raw materials: 65-90 parts nitrile rubber, 25-40 parts NV rubber-plastic alloy, 40-70 parts silica, 15-25 parts kaolin, 8-15 parts dioctyl terephthalate, 2-6 parts zinc oxide, 0.8-1.5 parts stearic acid, 1-4 parts antioxidant, 0.8-1.5 parts microcrystalline wax, 1.5-4 parts PEG4000, 1-4 parts coupling agent, 0.5-1.5 parts vulcanizing agent, and 2.5-6 parts accelerator.

[0012] As a further preferred embodiment of the technical solution of the present invention, the high wear-resistant rubber track material is prepared from the following raw materials in parts by weight: 70 parts nitrile rubber, 30 parts NV rubber-plastic alloy, 50 parts silica, 20 parts kaolin, 10 parts dioctyl terephthalate, 5 parts zinc oxide, 0.5-2 parts stearic acid, 2 parts antioxidant, 1 part microcrystalline wax, 2 parts PEG4000, 2 parts coupling agent, 1 part vulcanizing agent, and 3 parts accelerator.

[0013] As a preferred embodiment of the technical solution of the present invention, the grade of silica is 975#.

[0014] As a preferred embodiment of the present invention, the antioxidant is selected from one or two of antioxidant RD and antioxidant KY405.

[0015] As a preferred embodiment of the present invention, the coupling agent is silane coupling agent Si-69.

[0016] As a preferred embodiment of the present invention, the vulcanizing agent is vulcanizing agent S-80.

[0017] As a preferred embodiment of the present invention, the accelerator is selected from one or both of accelerators TBBS-80 and accelerator TMTD-80.

[0018] Secondly, the present invention provides a method for preparing the high wear-resistant rubber track material, comprising the following steps: After drying the silica, premix it with the coupling agent to obtain a premix. Plasticize the nitrile rubber and NV rubber-plastic alloy, then add the premix in batches and maintain at 135~140℃ for 2~3 minutes. Then add clay, zinc oxide, stearic acid, dioctyl terephthalate, PEG4000, microcrystalline wax, and antioxidant. Mix at 145~155℃ for 5~10 minutes and then discharge the material. Sheet it and cool it for 8~24 hours. Next, add the vulcanizing agent and accelerator, and perform final mixing on a two-roll mill. Finally, vulcanize and cool it naturally.

[0019] As a preferred embodiment of the present invention, the plasticizing temperature is 60~70℃; the final refining temperature is 80~90℃; and the vulcanization temperature is 150~160℃.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The rubber track material provided by this invention is mainly composed of NBR+PVC blend material. By combining functional additives and optimizing the preparation process, the prepared material is suitable for making tracks, meeting the requirements of wear resistance, no black marks, and excellent comprehensive performance. Detailed Implementation

[0021] The embodiments of the present invention are described in detail below. All embodiments are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0022] Unless otherwise specified, all chemical reagents and production equipment involved in this invention are purchased from the market.

[0023] The nitrile rubber used was NBR 3350, purchased from Guangzhou Liben Rubber Raw Material Trading Co., Ltd.

[0024] The NV rubber-plastic alloy is NV 3375, purchased from Shanghai Xiangtong Rubber & Chemical Co., Ltd.

[0025] The silica is silica 975#, purchased from Shandong Lianke New Materials Co., Ltd.

[0026] Dioctyl terephthalate, or DOTP.

[0027] The microcrystalline wax used was microcrystalline wax H3236, purchased from Shandong Ruiqi Chemical Co., Ltd.

[0028] The coupling agent was silane coupling agent Si-69, purchased from Guangzhou Housheng New Materials Co., Ltd.

[0029] Furthermore, unless otherwise specified, all weight parts mentioned in this invention are mass parts, and the weights mentioned can be scaled up proportionally.

[0030] Example 1 A high-wear-resistant rubber track material, by weight, is prepared from the following raw materials: 3500g nitrile rubber (NBR3350, Guangzhou Liben Rubber Raw Material Trading Co., Ltd.), 1500g NV rubber-plastic alloy (NV 3375, Shanghai Xiangtong Rubber Chemical Co., Ltd.), 2500g silica 975# (Shandong Lianke New Material Co., Ltd.), 1000g kaolin, 500g dioctyl terephthalate, 250g zinc oxide, 50g stearic acid, 100g antioxidant (50g antioxidant RD, 50g antioxidant KY405), 50g microcrystalline wax (microcrystalline wax H3236, Shandong Ruiqi Chemical Co., Ltd.), 100g PEG4000, 100g coupling agent (silane coupling agent Si-69, Guangzhou Housheng New Material Co., Ltd.), 50g vulcanizing agent S-80, and 150g accelerator (100g... Accelerator TBBS-80, 50g accelerator TMTD-80).

[0031] In this embodiment, the preparation of the above-mentioned high wear-resistant rubber track material includes the following steps: drying silica and premixing it with a coupling agent to obtain a premix; plasticizing nitrile rubber and NV rubber-plastic alloy (65°C, 60s), then adding the premix in batches, maintaining at 135°C for 3min, then adding clay, zinc oxide, stearic acid, dioctyl terephthalate, PEG4000, microcrystalline wax, and antioxidant, mixing at 150°C for 5min, then discharging the material and cooling it for 16h; then adding vulcanizing agent and accelerator, performing final mixing on a two-roll mill (85°C, 5min), and finally vulcanizing (155°C, 35min), followed by natural cooling.

[0032] Example 2 A high-wear-resistant rubber track material, by weight, is prepared from the following raw materials: 3400g nitrile rubber (NBR3350, Guangzhou Liben Rubber Raw Material Trading Co., Ltd.), 1550g NV rubber-plastic alloy (NV 3375, Shanghai Xiangtong Rubber Chemical Co., Ltd.), 2500g silica 975# (Shandong Lianke New Material Co., Ltd.), 940g kaolin, 520g dioctyl terephthalate, 210g zinc oxide, 80g stearic acid, 100g antioxidant (40g antioxidant RD, 60g antioxidant KY405), 60g microcrystalline wax (microcrystalline wax H3236, Shandong Ruiqi Chemical Co., Ltd.), 110g PEG4000, 95g coupling agent (silane coupling agent Si-69, Guangzhou Housheng New Material Co., Ltd.), 50g vulcanizing agent S-80, and 150g accelerator (80g... Accelerator TBBS-80, 70g accelerator TMTD-80).

[0033] In this embodiment, the preparation of the above-mentioned high wear-resistant rubber track material includes the following steps: drying silica and premixing it with a coupling agent to obtain a premix; plasticizing nitrile rubber and NV rubber-plastic alloy (65°C, 60s), then adding the premix in batches, maintaining at 135°C for 3min, then adding clay, zinc oxide, stearic acid, dioctyl terephthalate, PEG4000, microcrystalline wax, and antioxidant, mixing at 150°C for 5min, then discharging the material and cooling it for 16h; then adding vulcanizing agent and accelerator, performing final mixing on a two-roll mill (85°C, 5min), and finally vulcanizing (155°C, 35min), followed by natural cooling.

[0034] Example 3 A high-wear-resistant rubber track material, by weight, is prepared from the following raw materials: 3500g nitrile rubber (NBR3350, Guangzhou Liben Rubber Raw Material Trading Co., Ltd.), 1450g NV rubber-plastic alloy (NV 3375, Shanghai Xiangtong Rubber Chemical Co., Ltd.), 2600g silica 975# (Shandong Lianke New Material Co., Ltd.), 965g kaolin, 510g dioctyl terephthalate, 190g zinc oxide, 75g stearic acid, 100g antioxidant (55g antioxidant RD, 45g antioxidant KY405), 55g microcrystalline wax (microcrystalline wax H3236, Shandong Ruiqi Chemical Co., Ltd.), 1080g PEG4000, 105g coupling agent (silane coupling agent Si-69, Guangzhou Housheng New Material Co., Ltd.), 50g vulcanizing agent S-80, and 150g accelerator (70g... Accelerator TBBS-80, 80g accelerator TMTD-80).

[0035] In this embodiment, the preparation of the above-mentioned high wear-resistant rubber track material includes the following steps: drying silica and premixing it with a coupling agent to obtain a premix; plasticizing nitrile rubber and NV rubber-plastic alloy (65°C, 60s), then adding the premix in batches, maintaining at 135°C for 3min, then adding clay, zinc oxide, stearic acid, dioctyl terephthalate, PEG4000, microcrystalline wax, and antioxidant, mixing at 150°C for 5min, then discharging the material and cooling it for 16h; then adding vulcanizing agent and accelerator, performing final mixing on a two-roll mill (85°C, 5min), and finally vulcanizing (155°C, 35min), followed by natural cooling.

[0036] The materials prepared in Examples 1-3 were subjected to performance testing, and the methods are as follows: Hardness: Tested according to ASTM D2240.

[0037] Tensile strength: Tested according to ASTM D412.

[0038] Elongation at break: Tested according to ASTM D412.

[0039] Abrasion resistance: Tested according to ASTM D4060.

[0040] Tear strength: Tested according to ASTM D642.

[0041] Constant compression set: Tested according to ASTM D395, 100°C, 70h.

[0042] Thermal aging performance: After treatment at 100℃ for 70h, the test was conducted in accordance with ASTM D573.

[0043] Ozone cracking static tensile test: under conditions of 50 pphm concentration, 40℃, 20% tensile, and 96h, the test was conducted in accordance with ASTM D471.

[0044] The specific test results are shown in Table 1.

[0045] Table 1 Test Results

[0046] As can be seen from Table 1, the track material provided by this invention has good wear resistance and excellent overall performance, and has broad application prospects.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high wear-resistant rubber track material, characterized in that, It is prepared by weight from the following raw materials: 60-100 parts nitrile rubber, 20-50 parts NV rubber-plastic alloy, 30-80 parts silica, 10-30 parts kaolin, 5-20 parts dioctyl terephthalate, 1-8 parts zinc oxide, 0.5-2 parts stearic acid, 0.5-5 parts antioxidant, 0.5-2 parts microcrystalline wax, 1-5 parts PEG4000, 0.5-5 parts coupling agent, 0.5-2 parts vulcanizing agent, and 2-8 parts accelerator.

2. The high wear-resistant rubber track material according to claim 1, characterized in that, It is prepared by weight from the following raw materials: 65-90 parts nitrile rubber, 25-40 parts NV rubber-plastic alloy, 40-70 parts silica, 15-25 parts kaolin, 8-15 parts dioctyl terephthalate, 2-6 parts zinc oxide, 0.8-1.5 parts stearic acid, 1-4 parts antioxidant, 0.8-1.5 parts microcrystalline wax, 1.5-4 parts PEG4000, 1-4 parts coupling agent, 0.5-1.5 parts vulcanizing agent, and 2.5-6 parts accelerator.

3. The high wear-resistant rubber track material according to claim 1, characterized in that, The product is prepared by weight from the following raw materials: 70 parts nitrile rubber, 30 parts NV rubber-plastic alloy, 50 parts silica, 20 parts kaolin, 10 parts dioctyl terephthalate, 5 parts zinc oxide, 0.5-2 parts stearic acid, 2 parts antioxidant, 1 part microcrystalline wax, 2 parts PEG4000, 2 parts coupling agent, 1 part vulcanizing agent, and 3 parts accelerator.

4. The high wear-resistant rubber track material according to claim 1, characterized in that, The grade of silica is 975#.

5. The high wear-resistant rubber track material according to claim 1, characterized in that, The antioxidant is selected from one or both of antioxidants RD and antioxidant KY405.

6. The high wear-resistant rubber track material according to claim 1, characterized in that, The coupling agent is silane coupling agent Si-69.

7. The high wear-resistant rubber track material according to claim 1, characterized in that, The vulcanizing agent is vulcanizing agent S-80.

8. The high wear-resistant rubber track material according to claim 1, characterized in that, The accelerator is selected from one or both of accelerators TBBS-80 and accelerator TMTD-80.

9. A method for preparing the high wear-resistant rubber track material according to any one of claims 1 to 8, characterized in that, Includes the following steps: After drying the silica, premix it with the coupling agent to obtain a premix. Plasticize the nitrile rubber and NV rubber-plastic alloy, then add the premix in batches and maintain at 135~140℃ for 2~3 minutes. Then add clay, zinc oxide, stearic acid, dioctyl terephthalate, PEG4000, microcrystalline wax, and antioxidant. Mix at 145~155℃ for 5~10 minutes and then discharge the material. Sheet it and cool it for 8~24 hours. Next, add the vulcanizing agent and accelerator, and perform final mixing on a two-roll mill. Finally, vulcanize and cool it naturally.

10. The preparation method according to claim 9, characterized in that, The plasticizing temperature is 60~70℃; the final mixing temperature is 80~90℃; and the vulcanization temperature is 150~160℃.

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