A wear resistant rubber composition for dredging hose liners

Abstract

The present application relates to the technical field of rubber, in particular to a kind of wear-resistant rubber composition for dredging rubber pipe lining, which can be widely applied to dredging rubber pipe lining for conveying sand, gravel, coral hard particulate material in the working conditions such as channel dredging, port construction, artificial island development, seabed mining, etc.The present application greatly reduces the DIN abrasion value of rubber by synergistic reinforcement of two kinds of carbon black.Testing shows that the DIN abrasion value of vulcanized rubber of the compounded formula is only 90mm³, which is much better than the traditional single carbon black formula of 110mm³;At the same time, the rubber processing fluidity, anti-aging and bonding performance are considered, which is suitable for strong abrasion working conditions of dredging engineering for conveying gravel, rock, coral hard particles, effectively prolongs the service life of dredging rubber pipe lining, reduces the replacement cost of engineering, and can also be popularized to mine wear-resistant conveyor belt, wear-resistant lining plate and other products.The preparation process of the present application is simple, which can be directly adapted to existing rubber mixing and vulcanization production line, and the industrial production feasibility is high.

Description

Technical Field

[0001] This invention relates to the field of rubber technology, specifically to a wear-resistant rubber composition for the inner lining of dredging hoses. It can be widely used in dredging hose linings for transporting hard granular materials such as sand, gravel, and coral in conditions such as waterway dredging, port construction, artificial island and reef development, and seabed mining. Background Technology

[0002] In recent years, the application scope of dredging hoses has greatly expanded, not only for dredging of river, lake, and sea channels and port construction, but also for artificial land reclamation, island and reef development, marine construction, and seabed mining projects. The materials being transported contain large particles such as gravel, rock, and coral. The inner rubber lining continuously withstands the impact, friction, and cutting action of these particles. Ordinary rubber linings wear out quickly and are prone to short-term wear-through failure. Frequent hose replacements severely disrupt construction, significantly increase project costs, and affect the construction progress.

[0003] Existing conventional dredging hose rubber formulations mostly use a single carbon black reinforcement system, which has significant shortcomings in wear resistance and cannot meet the requirements of long-term high-intensity dredging conditions. Single carbon black reinforcement has defects such as insufficient reinforcement efficiency and poor resistance to cutting wear; if the total carbon black filling amount is simply increased, it will cause the rubber compound to deteriorate in processing fluidity, have higher hardness, reduce tear resistance, and shorten the bending fatigue life of the hose.

[0004] The industry urgently needs a rubber formulation that balances processing performance, mechanical properties, and ultra-low abrasion performance to address the industry pain point of rapid wear and scrapping of dredging hose linings. Summary of the Invention

[0005] To address the shortcomings of existing dredging hose linings, such as high wear and short service life, this invention provides a wear-resistant rubber composition for dredging hose linings. Through a synergistic reinforcement system of N134 high abrasion-resistant carbon black and N330 general-purpose carbon black, the composition significantly reduces the DIN volumetric wear value, improves the rubber's resistance to cutting and particle abrasion, and is suitable for long-term transportation of hard sand and gravel materials.

[0006] The specific solution adopted in this invention is as follows: A wear-resistant rubber composition for use as the inner lining of dredging hoses, made from the following raw materials in parts by weight: 70-80 parts natural rubber 20-30 parts of butadiene rubber 5-10 parts of octylphenol resin 4-8 parts zinc oxide Stearic acid 1.5-3.0 parts 0.5-1.5 parts of N-cyclohexyl-2-benzothiazole sulfenamide 0.1-0.5 parts of dibenzothiazole disulfide 1-3 parts of N-isopropyl-N′-phenyl-p-phenylenediamine 1-3 parts of 2,2,4-trimethyl-1,2-dihydroquinoline 0.1-0.3 parts of N-cyclohexylthiodicarboximide Carbon black N134 10-20 parts Carbon black N330 30-50 parts Industrial ester 1.5-3.0 parts 1.5-3.0 parts pine tar 1.5-3.5 parts machine oil 1-3 parts insoluble sulfur.

[0007] Further improvements to the above technical solution utilize the following components: 80 parts natural rubber, 30 parts butadiene rubber, 10 parts octylphenol resin, 8 parts zinc oxide, 3.0 parts stearic acid, 1.5 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.5 parts dibenzothiazole disulfide, 3 parts N-isopropyl-N′-phenyl-p-phenylenediamine, 3 parts 2,2,4-trimethyl-1,2-dihydroquinoline, 0.3 parts N-cyclohexylthiodicarboximide, 20 parts carbon black N134, 50 parts carbon black N330, 3.0 parts industrial ester, 3.0 parts pine tar, 3.5 parts machine oil, and 3 parts insoluble sulfur.

[0008] Further improvements to the above technical solution utilize the following components: 70 parts natural rubber, 20 parts butadiene rubber, 5 parts octylphenol resin, 4 parts zinc oxide, 1.5 parts stearic acid, 0.5 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.1 parts dibenzothiazole disulfide, 1 part N-isopropyl-N′-phenyl-p-phenylenediamine, 1 part 2,2,4-trimethyl-1,2-dihydroquinoline, 0.1 parts N-cyclohexylthiodicarboximide, 10 parts carbon black N134, 30 parts carbon black N330, 1.5 parts industrial ester, 1.5 parts pine tar, 1.5 parts machine oil, and 1 part insoluble sulfur.

[0009] A further improvement to the above technical solution is made from the following raw materials in parts by weight: 75 parts natural rubber, 25 parts butadiene rubber, 5 parts octylphenol resin, 5 parts zinc oxide, 1.5 parts stearic acid, 1.0 part N-cyclohexyl-2-benzothiazole sulfenamide, 0.3 parts dibenzothiazole disulfide, 1.5 parts N-isopropyl-N′-phenyl-p-phenylenediamine, 1.5 parts 2,2,4-trimethyl-1,2-dihydroquinoline, 0.1 parts N-cyclohexylthiodicarboximide, 10 parts carbon black N134, 40 parts carbon black N330, 1.5 parts industrial ester, 1.5 parts pine tar, 1.5 parts machine oil, and 1.5 parts insoluble sulfur.

[0010] In the above technical solution, the natural rubber is 3L rubber from Vietnam, the butadiene rubber is "Qilu" brand BR9000 rubber from Sinopec Qilu Co., Ltd., the octylphenol resin is produced by Wuxi Binwang Chemical Plant, the zinc oxide is produced by Yangzhou Zhenzhong Zinc Industry Co., Ltd., the stearic acid is produced by Indonesian PALMATA 1801 Company, the N-isopropyl-N′-phenyl-p-phenylenediamine is produced by Nanjing Chemical Industry Co., Ltd., the 2,2,4-trimethyl-1,2-dihydroquinoline is produced by Tianjin Kemai Chemical Co., Ltd., the N-cyclohexyl-2-benzothiazole sulfenamide is produced by Tianjin Labo Additives Co., Ltd., the dibenzothiazole disulfide is produced by Tianjin Labo Additives Co., Ltd., the carbon black N134 is produced by Jiangxi Black Cat Carbon Black Co., Ltd., the carbon black N330 is produced by Jiangxi Black Cat Carbon Black Co., Ltd., the pine tar is produced by Shaxian Changsheng Forest Products Chemical Co., Ltd., the engine oil is produced by Wuxi Refinery, and the insoluble sulfur is produced by Shandong Shangshun Chemical Co., Ltd.

[0011] The beneficial effects of this invention are: Synergistic wear resistance advantages of carbon black compound This invention employs a compound of N134 high-abrasion-resistant carbon black and N330 carbon black for reinforcement. N134 has a small particle size and high surface activity, significantly improving the rubber's resistance to cutting and wear. N330 balances the processing flowability and tensile strength of the rubber compound, and the compound avoids the defects of a single carbon black system. According to the DIN abrasion standard test conducted by the Key Laboratory of the Ministry of Education at Qingdao University of Science and Technology, the DIN abrasion value of the vulcanizate of this compound formulation is only 90 mm³, far lower than the original single carbon black formulation's 110 mm³, representing an 18.2% improvement in abrasion performance. The relative volumetric abrasion is consistently below 100 mm³, meeting the requirements for high-intensity dredging and abrasion-resistant conditions.

[0012] Anti-aging and long service life The rubber is formulated with a dual antioxidant system of 4010NA and RD, and reinforced with phenolic resin for increased viscosity. It exhibits excellent resistance to heat and oxygen aging and fatigue aging. The hose is not prone to cracking or hardening when transporting high-temperature sand and gravel for a long time, and the service life of the inner lining is significantly extended.

[0013] Excellent processing performance The industrial ester, pine tar, and machine oil composite softening and lubrication system reduces the Mooney viscosity of the rubber compound, ensuring smooth mixing and calendering without carbon black agglomeration or blistering defects in the rubber sheets; the insoluble sulfur combined with the composite accelerator system ensures uniform vulcanization without blooming, high bonding strength of the rubber hose, and prevents the inner lining from delaminating and falling off.

[0014] Wide range of applications In addition to lining dredging hoses, it can also be used for rubber products in high-wear conditions such as wear-resistant conveyor belts in mines, sand and gravel conveying hoses, and wear-resistant rubber liners for engineering machinery. Detailed Implementation

[0015] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0016] Example 1: A wear-resistant rubber composition for the inner lining of dredging hoses comprises 80 parts natural rubber, 30 parts butadiene rubber, 10 parts octylphenol resin, 8 parts zinc oxide, 3.0 parts stearic acid, 1.5 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.5 parts dibenzothiazole disulfide, 3 parts N-isopropyl-N′-phenyl-p-phenylenediamine, 3 parts 2,2,4-trimethyl-1,2-dihydroquinoline, 0.3 parts N-cyclohexylthiodicarboximide, 20 parts carbon black N134, 50 parts carbon black N330, 3.0 parts industrial ester, 3.0 parts pine tar, 3.5 parts machine oil, and 3 parts insoluble sulfur.

[0017] Example 2: A wear-resistant rubber composition for the inner lining of dredging hoses comprises 70 parts natural rubber, 20 parts butadiene rubber, 5 parts octylphenol resin, 4 parts zinc oxide, 1.5 parts stearic acid, 0.5 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.1 parts dibenzothiazole disulfide, 1 part N-isopropyl-N′-phenyl-p-phenylenediamine, 1 part 2,2,4-trimethyl-1,2-dihydroquinoline, 0.1 parts N-cyclohexylthiodicarboximide, 10 parts carbon black N134, 30 parts carbon black N330, 1.5 parts industrial ester, 1.5 parts pine tar, 1.5 parts machine oil, and 1 part insoluble sulfur.

[0018] Example 3: A wear-resistant rubber composition for the inner lining of dredging hoses is made from the following raw materials in parts by weight: 75 parts natural rubber, 25 parts butadiene rubber, 5 parts octylphenol resin, 5 parts zinc oxide, 1.5 parts stearic acid, 1.0 part N-cyclohexyl-2-benzothiazole sulfenamide, 0.3 parts dibenzothiazole disulfide, 1.5 parts N-isopropyl-N′-phenyl-p-phenylenediamine, 1.5 parts 2,2,4-trimethyl-1,2-dihydroquinoline, 0.1 parts N-cyclohexylthiodicarboximide, 10 parts carbon black N134, 40 parts carbon black N330, 1.5 parts industrial ester, 1.5 parts pine tar, 1.5 parts machine oil, and 1.5 parts insoluble sulfur.

[0019] In the above embodiments, the natural rubber is 3L rubber from Vietnam, the butadiene rubber is "Qilu" brand BR9000 rubber from Sinopec Qilu Co., Ltd., the octylphenol resin is from Wuxi Binwang Chemical Plant, the zinc oxide is from Yangzhou Zhenzhong Zinc Industry Co., Ltd., the stearic acid is from Indonesian PALMATA 1801 Co., Ltd., the N-isopropyl-N′-phenyl-p-phenylenediamine is from Nanjing Chemical Industry Co., Ltd., the 2,2,4-trimethyl-1,2-dihydroquinoline is from Tianjin Kemai Chemical Co., Ltd., the N-cyclohexyl-2-benzothiazole sulfenamide is from Tianjin Labo Additives Co., Ltd., the dibenzothiazole disulfide is from Tianjin Labo Additives Co., Ltd., the carbon black N134 is from Jiangxi Black Cat Carbon Black Co., Ltd., the carbon black N330 is from Jiangxi Black Cat Carbon Black Co., Ltd., the pine tar is from Shaxian Changsheng Forest Products Chemical Co., Ltd., the engine oil is from Wuxi Refinery, and the insoluble sulfur is from Shandong Shangshun Chemical Co., Ltd.

[0020] The samples produced by the above embodiments were sent to the Key Laboratory of the Ministry of Education of Qingdao University of Science and Technology for DIN abrasion testing. The test results showed that the DIN abrasion value was 90 mm³, the relative volumetric abrasion amount was <100 mm³, and the abrasion resistance performance met the standards.

[0021] The N134 / N330 compound carbon black reinforcement system was not used, and the remaining additive system was consistent with the example. After vulcanization under the same conditions, the DIN abrasion was tested. The test results showed that the DIN abrasion value was 110 mm³, which was significantly higher than that of the example of this invention, indicating insufficient abrasion resistance.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wear-resistant rubber composition for the inner lining of dredging hoses, characterized in that, Made from the following parts by weight of raw materials: 70-80 parts natural rubber 20-30 parts of butadiene rubber 5-10 parts of octylphenol resin 4-8 parts zinc oxide Stearic acid 1.5-3.0 parts 0.5-1.5 parts of N-cyclohexyl-2-benzothiazole sulfenamide 0.1-0.5 parts of dibenzothiazole disulfide 1-3 parts of N-isopropyl-N′-phenyl-p-phenylenediamine 1-3 parts of 2,2,4-trimethyl-1,2-dihydroquinoline 0.1-0.3 parts of N-cyclohexylthiodicarboximide Carbon black N134 10-20 parts Carbon black N330 30-50 parts Industrial ester 1.5-3.0 parts 1.5-3.0 parts pine tar 1.5-3.5 parts machine oil 1-3 parts insoluble sulfur.

2. The wear-resistant rubber composition for the inner lining of dredging hoses according to claim 1, characterized in that, Made from the following raw materials in parts by weight: 80 parts natural rubber, 30 parts butadiene rubber, 10 parts octylphenol resin, 8 parts zinc oxide, 3.0 parts stearic acid, 1.5 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.5 parts dibenzothiazole disulfide, 3 parts N-isopropyl-N′-phenyl-p-phenylenediamine, 3 parts 2,2,4-trimethyl-1,2-dihydroquinoline, 0.3 parts N-cyclohexylthiodicarboximide, 20 parts carbon black N134, 50 parts carbon black N330, 3.0 parts industrial ester, 3.0 parts pine tar, 3.5 parts machine oil, and 3 parts insoluble sulfur.

3. The wear-resistant rubber composition for the inner lining of dredging hoses according to claim 1, characterized in that, Made from the following raw materials in parts by weight: 70 parts natural rubber, 20 parts butadiene rubber, 5 parts octylphenol resin, 4 parts zinc oxide, 1.5 parts stearic acid, 0.5 parts N-cyclohexyl-2-benzothiazole sulfenamide, 0.1 parts dibenzothiazole disulfide, 1 part N-isopropyl-N′-phenyl-p-phenylenediamine, 1 part 2,2,4-trimethyl-1,2-dihydroquinoline, 0.1 parts N-cyclohexylthiodicarboximide, 10 parts carbon black N134, 30 parts carbon black N330, 1.5 parts industrial ester, 1.5 parts pine tar, 1.5 parts machine oil, and 1 part insoluble sulfur.

4. The wear-resistant rubber composition for the inner lining of dredging hoses according to claim 1, characterized in that, Made from the following raw materials in parts by weight: 75 parts natural rubber, 25 parts butadiene rubber, 5 parts octylphenol resin, 5 parts zinc oxide, 1.5 parts stearic acid, 1.0 part N-cyclohexyl-2-benzothiazole sulfenamide, 0.3 parts dibenzothiazole disulfide, 1.5 parts N-isopropyl-N′-phenyl-p-phenylenediamine, 1.5 parts 2,2,4-trimethyl-1,2-dihydroquinoline, 0.1 part N-cyclohexylthiodicarboximide, 10 parts carbon black N134, 40 parts carbon black N330, 1.5 parts industrial ester, 1.5 parts pine tar, 1.5 parts machine oil, and 1.5 parts insoluble sulfur.

5. The wear-resistant rubber composition for the inner lining of dredging hoses according to claim 2, characterized in that, The natural rubber is 3L rubber from Vietnam, the butadiene rubber is "Qilu" brand BR9000 rubber from Sinopec Qilu Co., Ltd., the octylphenol resin is from Wuxi Binwang Chemical Plant, the zinc oxide is from Yangzhou Zhenzhong Zinc Industry Co., Ltd., the stearic acid is from Indonesia PALMATA 1801 Co., Ltd., the N-isopropyl-N′-phenyl-p-phenylenediamine is from Nanjing Chemical Industry Co., Ltd., the 2,2,4-trimethyl-1,2-dihydroquinoline is from Tianjin Kemai Chemical Co., Ltd., the N-cyclohexyl-2-benzothiazole sulfenamide is from Tianjin Labo Additives Co., Ltd., the dibenzothiazole disulfide is from Tianjin Labo Additives Co., Ltd., the carbon black N134 is from Jiangxi Black Cat Carbon Black Co., Ltd., the carbon black N330 is from Jiangxi Black Cat Carbon Black Co., Ltd., the pine tar is from Shaxian Changsheng Forest Products Chemical Co., Ltd., the engine oil is from Wuxi Refinery, and the insoluble sulfur is from Shandong Shangshun Chemical Co., Ltd.