Precipitation-free rubber material for stabilizer bar bushing and preparation method of precipitation-free rubber material
By combining multiple antioxidants and using a reasonable mixing process, a stable cross-linked network structure is formed, which solves the problem of protective wax precipitation in the stabilizer bushing material under high and low temperature environments. This achieves excellent ozone and thermo-oxidative aging resistance, extends service life, and improves physical properties.
Patent Information
- Application Number
- CN202511303934.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-12
- Publication Date
- 2025-12-12
AI Technical Summary
The existing stabilizer bar bushing rubber material is prone to precipitating protective wax under high and low temperature environments, leading to adhesion failure and ozone corrosion, which affects service life and safety.
The formulation of non-exudable rubber materials, which uses a combination of various antioxidants, including natural rubber, zinc oxide, carbon black, vulcanizing agents and accelerators, forms a cross-linked network structure in which polysulfide bonds and monosulfide bonds coexist through reasonable matching and mixing processes. This avoids the exudation of protective wax and improves the resistance to ozone and thermo-oxidative aging.
It significantly improves the ozone and thermo-oxidative aging resistance of rubber materials, extends service life, reduces vehicle maintenance costs, solves the problem of adhesive failure, and maintains good physical properties.
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of automobile accessory materials, and particularly relates to a stable rod bushing non-extracated rubber material and a preparation method thereof. BACKGROUND
[0002] At present, most of the automobiles are equipped with a stabilizer bar (also known as an anti-roll bar), which is a simple U-shaped metal connecting rod responsible for linking the two sides of the suspension. The role is to stretch the inner side of the suspension and compress the outer side when the vehicle turns, and the stabilizer bar at this time plays a role of resisting torsion to reduce the stretching and compression amplitude, so as to control the roll amplitude of the vehicle. The two ends of the stabilizer bar are connected with the suspension, and the middle part is fixed to the subframe through a clamp and a bushing, so that the suspension, the subframe and the stabilizer bar are connected into a whole, effectively balancing the turning inclination angle and the stress to the minimum. When the vehicle turns, the excitation generated by the road is transmitted to the rubber bushing through the rod, and at this time the bushing will bear a certain stress and torsional friction, and the performance requirements of the bushing are also relatively high, the most important of which is that there is no abnormal sound in the friction under high and low temperature environments and the durability life is 100,000 kilometers.
[0003] The existing stabilizer bar bushing material is generally the same as the ordinary chassis bushing, mainly a natural rubber composition. In the production and use process of the stabilizer bar bushing, in order to improve the ozone resistance of the natural rubber and avoid cracks caused by ozone corrosion of the rubber, a protective wax is usually added to the rubber formula. However, the protective wax is easy to extracate from the inside of the rubber to the surface during the use of the rubber, and the stabilizer bar bushing is usually assembled by using a secondary bonding method, and the extracation of the protective wax will cause the bonding performance of the bonding interface to decrease, and then cause the bonding failure problem, thereby affecting the service life and safety of the stabilizer bar bushing. If the protective wax is not added, the natural rubber is easy to be corroded by ozone during use and produce cracks, and also cannot meet the use requirements of the stabilizer bar bushing. Therefore, how to ensure that the stabilizer bar bushing has excellent ozone resistance while avoiding the bonding failure problem caused by the extracation of the protective wax has become a technical problem to be solved. SUMMARY
[0004] One of the purposes of the present application is to provide a stabilizer bar bushing non-extracated rubber material to solve the problems of bonding failure and cracks caused by ozone corrosion due to the extracation of the protective wax of the stabilizer bar bushing rubber material. The second purpose of the present application is to provide a preparation method of a stabilizer bar bushing non-extracated rubber material.
[0005] The purposes of the present application can be realized by the following technical solutions. In a first aspect, a stabilizer bar bushing non-extracated rubber material comprises the following components in parts by weight: 100 parts of natural rubber; Zinc oxide 4-8 parts; Stearic acid 1-3 parts; Compound antioxidant 3-8 parts; Carbon black 20-60 parts; Vulcanizing agent 0.3-2 parts; Compound accelerator 1.5-5.5 parts; Anti-scorching agent 0.1-0.5 parts.
[0006] Further, the compound antioxidant is at least 3 of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, N-N'-diphenyl-p-phenylenediamine, N-(1,3 dimethylbutyl)-N' phenyl-p-phenylenediamine, N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine in any proportion.
[0007] Further, the compound antioxidant is composed of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, N-N'-diphenyl-p-phenylenediamine, N-(1,3 dimethylbutyl)-N' phenyl-p-phenylenediamine, N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine in a weight ratio of 1-2:1-2:1-2:1-3.
[0008] The use of multiple antioxidants in combination can fully exert the synergistic effect of each antioxidant, reduce the amount of single antioxidant and the risk of precipitation, and significantly improve the anti-ozone aging performance and anti-thermal aging performance of the rubber material.
[0009] Further, the carbon black is at least one or more of carbon black N330, carbon black N550, carbon black N774 in any proportion.
[0010] Carbon black, as a reinforcing agent for rubber, can improve the physical and mechanical properties of rubber such as hardness and tensile strength. Different types of carbon black have different effects on the performance of rubber. By reasonably selecting and matching the type and amount of carbon black, the rubber material can meet the performance requirements of the stabilizer bushing.
[0011] Further, the vulcanizing agent is any one of 4'4-dithiodimorpholine or sulfur.
[0012] Further, the vulcanizing agent is sulfur.
[0013] The vulcanizing agent causes cross-linking reaction of rubber molecules, forming a three-dimensional network structure, improving the elasticity and strength of rubber, and 4'4-dithiodimorpholine and sulfur can effectively vulcanize rubber and improve the performance of vulcanized rubber.
[0014] Further, the complex accelerator is at least two of N-cyclohexyl-2-benzothiazole sulfenamide, N,N'-dimethyl-N,N'-diphenylthiuram disulfide, 2-mercapto benzothiazole, tetraethyl thiuram disulfide, 2,2'-dithiobisbenzothiazole, tetramethyl thiuram disulfide in any proportion.
[0015] Further, the complex accelerator is composed of N-cyclohexyl-2-benzothiazole sulfenamide and N,N'-dimethyl-N,N'-diphenylthiuram disulfide in a weight ratio of 1.5-2.5:1.5-3.
[0016] The accelerator can accelerate the vulcanization speed of the rubber, shorten the vulcanization time, improve the vulcanization efficiency, and also improve the physical and mechanical properties of the vulcanized rubber.
[0017] Further, the anti-scorching agent is N-cyclohexyl thio phthalimide, which can combine with the active groups of the accelerator to form a stable 'temporary complex', temporarily blocking the reaction of the accelerator with the sulfide, and delaying the generation of active intermediates.
[0018] In a second aspect, a preparation method of a stable rod bushing without precipitation rubber material includes the following steps: S1 First-stage mixing: mixing natural rubber in a Banbury mixer for 25-30s, then adding zinc oxide, stearic acid and complex anti-aging agent to mix to 70-80 DEG C, then adding carbon black to mix to 128-132 DEG C, and respectively pulling out the jack at 100 DEG C and 120 DEG C for 15-30s; the glue is discharged to obtain a first-stage rubber; S2 Second-stage mixing: after the first-stage rubber is parked for 8-16h, adding vulcanizing agent, complex accelerator and anti-scorching agent, mixing to 100-110 DEG C, and then discharging the glue to obtain a final rubber; S3 Vulcanization: after the final rubber is formed, it is sent into a vulcanizing machine to be vulcanized at 145-155 DEG C for 7-12min to obtain a finished rubber material.
[0019] Compared with the prior art, the present application has the following advantages: 1.The present application provides a stable rod bushing without precipitation rubber material, comprising natural rubber 100 parts; zinc oxide 4-8 parts; stearic acid 1-3 parts; compound antioxidant 3-8 parts; carbon black 20-60 parts; vulcanizing agent 0.3-2 parts; compound accelerator 1.5-5.5 parts; scorch retarder 0.1-0.5 parts; reasonable collocation of antioxidants in the formula, such as the selected 2,2,4-trimethyl-1,2-dihydroquinoline polymer (polymeric antioxidant, high molecular weight, low migration), N-N'-diphenyl-p-phenylenediamine and the like are low migration antioxidants, and the concentration of single additive is further reduced by "at least three compounds", reducing the risk of precipitation from the source, replacing the traditional protective paraffin, improving long-term stability; N-(1,3-dimethylbutyl)-N' phenyl-p-phenylenediamine and N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine are compounded to provide excellent ozone and ultraviolet aging resistance, which can maintain stable performance at -40℃-120℃, and is suitable for extremely cold or high temperature working conditions; natural rubber as the matrix provides high elasticity, and is matched with carbon black N550 / N774 (medium-high structure, low heat generation) to balance hardness and flexibility, significantly reduce the dynamic heat generation and permanent deformation of the stable rod bushing under repeated torsion and compression load, and prolong the service life; the compound accelerator optimizes the vulcanization network structure to form a coexisting system of polysulfide bonds and monosulfide bonds, improve the uniformity of crosslinking density, and enhance the flex fatigue resistance; the scorch retarder precisely controls the scorching time to avoid premature vulcanization during high temperature mixing, while the vulcanizing agent + compound accelerator system realizes rapid vulcanization, reduces energy consumption and improves production efficiency. A small amount of zinc oxide reduces the vulcanization temperature, reacts with stearic acid to form zinc stearate, and enhances the utilization rate of the vulcanizing agent; the generated zinc stearate further promotes the vulcanization reaction, and both of them assist to improve the material performance. The present application ensures that the rubber material has excellent ozone resistance, avoids the problem of precipitation of protective wax, reduces the chemical corrosion to the surrounding metal parts (such as the stabilizer bar), and reduces the maintenance cost of the whole vehicle; at the same time, the problem of secondary bonding and degumming of the stabilizer bushing is solved, and the rubber material also has good hardness, tensile strength, elongation at break, pressure change and other physical properties, has good anti-aging ability, and has long service life.
[0020] 2.In the process of preparing the stable rod bushing without precipitation rubber material, the mixing and vulcanization temperature is lower than that of general natural rubber, and the formula rubber components can be further matched at the mixing temperature of the present application to reduce precipitation. DETAILED DESCRIPTION
[0021] The specific embodiments of the present application are described in detail below, but it should be understood that the protection scope of the present application is not limited by the specific embodiments.
[0022] The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the description of the application and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
[0023] It should be understood that, in various embodiments of the present application, the magnitude of the serial number of each process does not mean the order of execution, and part or all of the steps can be executed in parallel or in sequence, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.
[0024] The weight of the related components mentioned in the specification of the embodiments of the present application can not only refer to the specific content of each component, but also represent the weight ratio relationship between each component, therefore, as long as the content of the related components in the specification of the embodiments of the present application is enlarged or reduced in proportion, it is within the scope disclosed in the specification of the embodiments of the present application. Specifically, the mass mentioned in the specification of the embodiments of the present application can be μg, mg, g, kg and other mass units commonly known in the chemical field.
[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the application.
[0026] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present application can be purchased from the market or can be prepared by existing methods. Specifically, the natural rubber is any one of TSR 10CV, SMR5#, 1#RSS, 3#RSS and SVR 3L, these types of natural rubber have good physical and mechanical properties and processing performance, which can meet the requirements of the rubber base material for the stabilizer bushing; in the following examples and comparative examples, the natural rubber is TSR 10CV.
[0027] The following will be further described with specific examples.
[0028] Example 1
[0029] A non-precipitation rubber material for a stabilizer bushing, according to weight parts, includes the following components: 100 parts of natural rubber; 5 parts of zinc oxide; 1 part of stearic acid; Antioxidant package 6.5 parts, consisting of 1.5 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 2 parts of N-N'-diphenyl-p-phenylenediamine, 1 part of N-(1,3 dimethylbutyl)-N' phenyl-p-phenylenediamine, 2 parts of N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine; Carbon black 20 parts, consisting of carbon black N330; Vulcanizing agent 0.5 parts, consisting of sulfur; Accelerator package 5.5 parts, consisting of 2.5 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 3 parts of N,N'-dimethyl-N,N'-diphenylthiuram disulfide; Anti-scorching agent 0.1 part, consisting of N-cyclohexyl thio-phthalimide.
[0030] The preparation method of the stable rod bushing with no precipitation rubber material comprises the following steps: S1 First-stage mixing: the natural rubber is mixed in a mixer for 30 s, then zinc oxide, stearic acid and an antioxidant package are added and mixed until 75℃, then carbon black is added and mixed until 130℃, and the top bolt is pulled out at 100℃ and 120℃ respectively for 20 s; the glue is discharged to obtain a first-stage glue; S2 Second-stage mixing: the first-stage glue is placed for 14 h, then a vulcanizing agent, an accelerator package and an anti-scorching agent are added, and the glue is mixed until 100-110℃ and then discharged to obtain a final glue; S3 Vulcanization: the final glue is shaped and sent to a vulcanizing machine, vulcanized at 150℃ for 10 min, and a finished rubber material is obtained.
[0031] Example 2
[0032] A stable rod bushing with no precipitation rubber material, according to parts by weight, comprises the following components: Natural rubber 100 parts; Zinc oxide 5 parts; Stearic acid 2 parts; Antioxidant package 6.5 parts, consisting of 1.5 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 1 part of N-N'-diphenyl-p-phenylenediamine, 2 parts of N-(1,3 dimethylbutyl)-N' phenyl-p-phenylenediamine, 2 parts of N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine; Carbon black 35 parts, consisting of 10 parts of carbon black N330 and 25 parts of carbon black N550; Vulcanizing agent 0.5 parts, consisting of sulfur; Accelerator package 4 parts, consisting of 1.5 parts of N-cyclohexyl-2-benzothiazole sulfenamide and 2.5 parts of N,N'-dimethyl-N,N'-diphenylthiuram disulfide; Anti-scorching agent 0.3 parts, consisting of N-cyclohexylthiophthalimide; The preparation method is the same as that in Example 1.
[0033] Example 3
[0034] A non-precipitation rubber material for a stabilizer bar bushing, comprising the following components in parts by weight: Natural rubber 100 parts; Zinc oxide 8 parts; Stearic acid 1 part; Compound antioxidant 5.5 parts, consisting of 1.5 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 1 part of N-N'-diphenyl-p-phenylenediamine, 1 part of N-(1,3 dimethylbutyl)-N' phenyl-p-phenylenediamine, 2 parts of N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine; Carbon black 40 parts, consisting of carbon black N550; Vulcanizing agent 1.5 parts, consisting of sulfur; Compound accelerator 4 parts, consisting of 2 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 2 parts of N,N'-dimethyl-N,N'-diphenylthiuram disulfide; Anti-scorching agent 0.3 parts, consisting of N-cyclohexylthiophthalimide; The preparation method is the same as that in Example 1.
[0035] Example 4
[0036] A non-precipitation rubber material for a stabilizer bar bushing, comprising the following components in parts by weight: Natural rubber 100 parts; Zinc oxide 8 parts; Stearic acid 1 part; Compound antioxidant 6.5 parts, consisting of 2 parts of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 1.5 parts of N-N'-diphenyl-p-phenylenediamine, 1.5 parts of N-(1,3 dimethylbutyl)-N' phenyl-p-phenylenediamine, 1.5 parts of N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine; Carbon black 60 parts, consisting of 30 parts of carbon black N550, 30 parts of carbon black N774; Vulcanizing agent 1.5 parts, consisting of sulfur; Compound accelerator 3.5 parts, consisting of 2 parts of N-cyclohexyl-2-benzothiazole sulfenamide, 1.5 parts of N,N'-dimethyl-N,N'-diphenylthiuram disulfide; Anti-scorching agent 0.4 parts, consisting of N-cyclohexylthiophthalimide; The preparation method is the same as that in Example 1.
[0037] Example 5
[0038] A rubber material for stabilizer bushing without precipitation, comprising the following components by weight fraction: Natural rubber 100 parts; Zinc oxide 8 parts; Stearic acid 2 parts; Compound antioxidant 6.5 parts, consisting of 2 parts 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 1.5 parts N-N'-diphenyl-p-phenylenediamine, 1.5 parts N-(1,3 dimethylbutyl)-N' phenyl-p-phenylenediamine, 1.5 parts N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine; Carbon black 60 parts, consisting of 30 parts carbon black N330, 30 parts carbon black N774; Vulcanizing agent 2 parts, consisting of sulfur; Compound accelerator 4 parts, consisting of 2 parts N-cyclohexyl-2-benzothiazole sulfenamide, 2 parts N,N'-dimethyl-N,N'-diphenylthiuram disulfide; Anti-scorching agent 0.5 parts, consisting of N-cyclohexyl thio phthalimide; The preparation method remains the same as in Example 1.
[0039] Comparative Example 1
[0040] A rubber material for stabilizer bushing, which is different from Example 1 in that the compound antioxidant is replaced by 6.5 parts of paraffin wax; the rest of the components and the preparation method parameters remain the same.
[0041] Comparative Example 2
[0042] A rubber material for stabilizer bushing, which is different from Example 1 in that the compound antioxidant consists of 4.5 parts 2,2,4-trimethyl-1,2-dihydroquinoline polymer, 2 parts N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine; the rest of the components and the preparation method parameters remain the same.
[0043] Comparative Example 3
[0044] A rubber material for stabilizer bushing, which is different from Example 1 in that the compound accelerator is replaced by 5.5 parts of N-cyclohexyl-2-benzothiazole sulfenamide; the rest of the components and the preparation method parameters remain the same.
[0045] The weight fraction of each component in the above examples and comparative examples is shown in Table 1.
[0046] Table 1
[0047] The rubber materials prepared in Examples 1-5 and Comparative Examples 1-3 were subjected to performance tests: (1) Hardness test: referring to the standard method of Shore hardness meter in GB / T 531.1-2008; (2) Strength test: referring to the standard in GB / T 528-2009; (3) Elongation test: referring to the standard in GB / T 528-2009; (4) 200pphm ozone resistance test: referring to the standard in GB / T 7762-2014; (5) Precipitation: observed by naked eyes.
[0048] The above test results are shown in Table 2.
[0049] Table 2
[0050] It can be seen from the above tests that the natural rubber material without precipitation prepared according to the formulation and preparation method of the present application has no precipitation risk, solves the problem of secondary bonding and degumming of the stabilizer bushing, and at the same time maintains excellent ozone resistance, good physical properties such as hardness, tensile strength, elongation at break, pressure change, and anti-aging, and long service life.
[0051] It should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying that there is any such actual relationship or order between these entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.
[0052] The above disclosure is only a few specific embodiments of the present application, but the embodiments of the present application are not limited thereto, and any changes that can be thought of by those skilled in the art should fall within the protection scope of the present application.
Claims
1. A non-exudable rubber material for stabilizer bar bushings, characterized in that, Based on parts by weight, it includes the following components: 100 parts natural rubber; 4-8 parts zinc oxide; 1-3 parts stearic acid; 3-8 parts compound antioxidant; Carbon black 20-60 parts; vulcanizing agent 0.3-2 parts; compound accelerator 1.5-5.5 parts; anti-scorching agent 0.1-0.5 parts.
2. The stabilizer bar bushing non-exudable rubber material according to claim 1, characterized in that, The compound antioxidant is at least three of the following: 2,2,4-trimethyl-1,2-dihydroquinoline polymer, N-N'-diphenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, and N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine, combined in any proportion.
3. The non-exudable rubber material for the stabilizer bar bushing according to claim 2, characterized in that, The compound antioxidant is composed of 2,2,4-trimethyl-1,2-dihydroquinoline polymer, N-N'-diphenyl-p-phenylenediamine, N-(1,3-dimethylbutyl)-N'-phenyl-p-phenylenediamine, and N,N'-bis(1,4-dimethylpentyl)-p-phenylenediamine in a weight ratio of 1-2:1-2:1-2:1-3.
4. The non-exudable rubber material for the stabilizer bar bushing according to claim 1, characterized in that, The carbon black is at least one or more of carbon black N330, carbon black N550, and carbon black N774, combined in any proportion.
5. The non-exudable rubber material for the stabilizer bar bushing according to claim 1, characterized in that, The vulcanizing agent is either 4',4-dithiodimorpholine or sulfur.
6. The non-exudable rubber material for the stabilizer bar bushing according to claim 5, characterized in that, The sulfiding agent is sulfur.
7. The non-exudable rubber material for the stabilizer bar bushing according to claim 1, characterized in that, The compound accelerator is at least two of the following: N-cyclohexyl-2-benzothiazole sulfenamide, N,N'-dimethyl-N,N'-diphenylthiuram disulfide, 2-mercaptobenzothiazole, tetraethylthiuram disulfide, 2,2′-dibenzothiazole disulfide, and tetramethylthiuram disulfide, combined in any proportion.
8. The non-exudable rubber material for the stabilizer bar bushing according to claim 7, characterized in that, The compound accelerator is composed of N-cyclohexyl-2-benzothiazole sulfenamide and N,N'-dimethyl-N,N'-diphenylthiuram disulfide in a weight ratio of 1.5-2.5:1.5-3.
9. The non-exudable rubber material for the stabilizer bar bushing according to claim 1, characterized in that, The scorching inhibitor is N-cyclohexylthiophthalimide.
10. A method for preparing a non-exudable rubber material for stabilizer bar bushings, used to prepare the non-exudable rubber material for stabilizer bar bushings as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Mix natural rubber in a mixer for 25-30 seconds, then add zinc oxide, stearic acid and compound antioxidant and mix to 70-80℃, then add carbon black and mix to 128-132℃, and lift the top plug once at 100℃ and once at 120℃, for 15-30 seconds each time; discharge the rubber to obtain a section of rubber compound; S2: After letting a section of rubber compound stand for 8-16 hours, add vulcanizing agent, compound accelerator and anti-scorching agent, mix at 100-110℃ and then discharge the rubber to obtain the final rubber compound. S3: After the final rubber compound is molded, it is sent to a vulcanizing machine and vulcanized at 145-155℃ for 7-12 minutes to obtain the finished rubber material.