CN114106422A - Rubber and preparation method and application thereof - Google Patents
Rubber and preparation method and application thereof Download PDFInfo
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- CN114106422A CN114106422A CN202010883427.6A CN202010883427A CN114106422A CN 114106422 A CN114106422 A CN 114106422A CN 202010883427 A CN202010883427 A CN 202010883427A CN 114106422 A CN114106422 A CN 114106422A
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Abstract
The application provides rubber which comprises the following components in parts by weight: 100 parts of main rubber, 5-83 parts of auxiliary agent, 1-3 parts of polytetrafluoroethylene, 0.5-2 parts of metal compound lubricant, 5-20 parts of amide slipping agent, 2-10 parts of lipophilic polyglycerol ester, 1-10 parts of coupling agent, vulcanizing agent and vulcanization accelerator. The rubber can be in a self-lubricating state for a long time, has a small friction coefficient, an excellent damping effect, good wear resistance and excellent mechanical property, and is beneficial to wide application. The application also provides a preparation method and application of the rubber.
Description
Technical Field
The application relates to the technical field of materials, in particular to rubber, and a preparation method and application thereof.
Background
The rubber material has the advantages of high elasticity, wear resistance, impact resistance and the like, and is often made into a damping part for use. Because the performance of the rubber is limited, the rubber shock absorption piece still can rub with a product in the using process, even generates abnormal sound, and further influences the wide use of rubber materials.
Disclosure of Invention
In view of the above, the application provides a rubber and a preparation method thereof, the rubber can be in a self-lubricating state for a long time, has a small friction coefficient, an excellent damping effect, good wear resistance and excellent mechanical properties, can greatly reduce the friction force between the rubber and a product when being applied to a damping part, eliminates abnormal sound, and is beneficial to wide application.
In a first aspect, the present application provides a rubber comprising the following components in parts by weight:
and a vulcanizing agent and a vulcanization accelerator.
In the application, the polytetrafluoroethylene, the metal compound lubricant and the amide slipping agent greatly improve the self-lubricating property of the rubber, and simultaneously enable the rubber to keep the self-lubricating effect for a long time, reduce the friction coefficient and improve the damping effect; meanwhile, the lipophilic polyglycerol ester, the coupling agent and the auxiliary agent increase the compatibility and the dispersion uniformity among the components, improve the mechanical property, the wear resistance and the fatigue durability of the rubber and prolong the service life of the rubber.
Optionally, the rubber further comprises 1-10 parts by weight of a surfactant, and the surfactant comprises at least one of linear alkyl benzene sulfonate, polysorbate and lignosulfonate.
Optionally, the mass ratio of the polytetrafluoroethylene to the metal compound lubricant is (1-3): 1.
optionally, the main rubber comprises at least one of natural rubber, styrene butadiene rubber, chloroprene rubber, ethylene propylene rubber, nitrile rubber and isoprene rubber; the auxiliary agent comprises at least one of a plasticizer, a reinforcing agent, an active agent and an anti-aging agent; the metal compound lubricant comprises at least one of molybdenum disulfide, tungsten disulfide, niobium diselenide, tungsten diselenide, ferroferric oxide, aluminum oxide, lead oxide, ferric chloride, cadmium iodide, lead iodide and mercury iodide; the amide slipping agent comprises at least one of oleamide and erucamide; the lipophilic polyglycerol ester comprises at least one of triglycerol distearate, hexaglycerol tristearate and hexaglycerol pentastearate; the coupling agent comprises at least one of a silane coupling agent and a titanate coupling agent; the vulcanizing agent comprises at least one of sulfur, 4-4' -dimorpholinyl disulfide, tetramethylthiuram disulfide, dipentamethylenethiuram tetrasulfide and disulfide dichloride; the vulcanization accelerator comprises at least one of sulfenamide accelerators, dithiocarbamate accelerators, thiuram accelerators and thiazole accelerators.
Optionally, the auxiliary agent comprises the following components in parts by weight:
further, the plasticizer comprises at least one of fatty hydrocarbon oil, naphthenic hydrocarbon oil, aromatic hydrocarbon oil and ester plasticizer; the reinforcing agent comprises at least one of carbon black, white carbon black, calcium carbonate, argil, talcum powder and diatomite; the active agent comprises at least one of zinc oxide, zinc carbonate, zinc stearate, stearic acid, sodium stearate salt and potassium stearate salt; the anti-aging agent comprises at least one of N-isopropyl-N-base plastic phenyl-p-phenylenediamine, N-base p-xylyl-p-phenylenediamine, 2, 4-trimethyl-1, 2-dihydroquinoline polymer, microcrystalline wax and paraffin.
The application provides a rubber can be in the self-lubricating state for a long time, and coefficient of friction is little, and the shock attenuation effect is good, and the wearability is good, and mechanical properties is excellent.
In a second aspect, the present application provides a method of preparing a rubber, comprising:
plasticizing 100 parts by weight of main rubber, and mixing with 1 part by weight to 3 parts by weight of polytetrafluoroethylene, 0.5 part by weight to 2 parts by weight of metal compound lubricant, 1 part by weight to 10 parts by weight of coupling agent, 2 parts by weight to 10 parts by weight of lipophilic polyglycerol ester, 5 parts by weight to 20 parts by weight of amide slipping agent and 5 parts by weight to 83 parts by weight of auxiliary agent to prepare a co-mixed rubber;
and mixing the blended rubber with a vulcanizing agent and a vulcanization accelerator, and vulcanizing to obtain the rubber.
Optionally, the preparing of the blend glue includes: mixing the polytetrafluoroethylene and the metal compound lubricant, and adding the coupling agent to form a first mixture; mixing said first mixture with said lipophilic polyglycerol ester, said amide slip agent to form a second mixture; and plasticizing the main rubber, and mixing the plasticized main rubber with the second mixture and the auxiliary agent to obtain the blended rubber.
Optionally, the forming the first mixture further comprises: and mixing the polytetrafluoroethylene and the metal compound lubricant, adding 1-10 parts by weight of surfactant, uniformly mixing, and adding the coupling agent to form the first mixture.
Optionally, the forming the second mixture further comprises: the first mixture is mixed with the lipophilic polyglycerol ester, the amide slip agent, and the strengthening agent to form the second mixture.
The preparation method of the rubber is simple, convenient to operate, capable of realizing large-scale production and beneficial to wide application.
In a third aspect, the present application provides the use of the rubber obtained by the preparation method of the first aspect or the second aspect in a shock absorbing member.
In this application, this rubber can keep self-lubricating property for a long time, and coefficient of friction is little, and the wearability is good, and mechanical properties is excellent, when being applied to the damper, can greatly reduce the frictional force between damper and the product to eliminate the abnormal sound because of the friction causes, be favorable to its use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.
FIG. 1 is a flow chart illustrating the preparation of a rubber according to an embodiment of the present disclosure.
FIG. 2 is a flow chart illustrating the preparation of a rubber according to another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The application provides rubber which comprises the following components in parts by weight:
and a vulcanizing agent and a vulcanization accelerator.
In the application, the friction coefficient of the polytetrafluoroethylene is extremely low, so that the lubricating property of the rubber can be greatly improved, the crushing resistance of the rubber can be improved, and the rubber is prevented from being crushed and broken in the demolding and using processes; the metal compound lubricant can reduce friction at low temperature, can improve the luster, wear resistance, pollution resistance and tensile property of rubber, and can prevent cracking at high temperature; the amide slipping agent can improve the lubricating, antistatic and moisture-proof performances of the rubber, remarkably reduce the friction and bonding resistance and prevent bonding. When the rubber provided by the application is used, the amide slipping agent is separated out to the surface of the rubber, so that the lubricating effect of the rubber is ensured, the friction is reduced, the damping effect is improved, and abnormal sound is avoided; after the amide slipping agent is lost, the metal compound lubricating agent can slip to the surface of the rubber, so that the lubricating effect and the friction coefficient of the rubber are further ensured; after the metal compound lubricant is lost, the polytetrafluoroethylene dispersed in the rubber plays a role, and the lubricating effect and the friction coefficient of the rubber are ensured. The application provides a rubber is in the use, and the material that has the lubrication action can continuously guarantee the self-lubricating performance of rubber, reduces the coefficient of friction of rubber as far as possible, promotes the shock attenuation effect, avoids the emergence of abnormal sound, and rubber has better fatigue durability simultaneously, is favorable to its application.
In the application, the lipophilic polyglycerol ester, the coupling agent and the auxiliary agent can improve the dispersion degree of polytetrafluoroethylene, metal compound lubricants and amide slipping agents in rubber, avoid the problem of rubber performance reduction caused by uneven dispersion, improve the mechanical property and the wear resistance of the rubber, improve the fatigue durability and prolong the service life of the rubber.
In one embodiment of the present application, the rubber further comprises 1 to 10 parts by weight of a surfactant. In the application, the surface performance of the main rubber can be improved by adding the surfactant, so that the compatibility between the main rubbers is improved, the interface bonding force is enhanced, and the mechanical property and the fatigue durability of the rubber are improved. In an embodiment of the application, the surfactant comprises at least one of linear alkyl benzene sulfonate, polysorbate and lignosulfonate, so that the surface performance of the main rubber can be improved, the stability of the rubber can be improved, and the dispersibility of organic components can be improved, so that the service performance of the rubber is improved. In another embodiment of the present application, the rubber further comprises 3 parts to 10 parts of a surfactant. Thereby further improving the compatibility between the main rubbers.
In the application, the rubber comprises 1-3 parts by weight of polytetrafluoroethylene, and the added polytetrafluoroethylene can ensure the self-lubricating and damping effects of the rubber and also avoid the influence of excessive content on the strength and fatigue durability of the rubber. Specifically, the rubber may include, but is not limited to, 1 part by weight, 1.5 parts by weight, 2 parts by weight, 2.5 parts by weight, or 3 parts by weight of polytetrafluoroethylene. In one embodiment of the present application, the particle size of the polytetrafluoroethylene is 1 μm to 5 μm. Thereby being beneficial to the uniform dispersion of the polytetrafluoroethylene in the rubber, avoiding the agglomeration phenomenon and ensuring the uniform lubricating effect of the rubber.
In the application, the rubber comprises 0.5-2 parts by weight of metal compound lubricant, and the metal compound lubricant is used as an important solid lubricant in the rubber, so that the self-lubricating effect of the rubber is greatly improved. Specifically, the rubber may include, but is not limited to, 0.8 parts by weight, 1 part by weight, 1.5 parts by weight, 1.7 parts by weight, or 2 parts by weight of a metal compound-based lubricant. In an embodiment of the present application, the metal compound-based lubricant includes at least one of molybdenum disulfide, tungsten disulfide, niobium diselenide, tungsten diselenide, ferroferric oxide, aluminum oxide, lead oxide, ferric chloride, cadmium iodide, lead iodide, and mercury iodide. Therefore, the lubricating oil can be separated out to the surface of the rubber during the use of the rubber, and a lubricating effect is generated. In an embodiment of the present application, the metal compound-based lubricant includes at least one of molybdenum disulfide and tungsten disulfide. Molybdenum disulfide, tungsten disulfide are lamellar structure, very easily the slippage to the rubber surface, promote the self-lubricating and the shock attenuation effect of rubber, play the guard action, increase of service life to rubber. In one embodiment of the present application, the size of the metal compound-based lubricant is on the nanometer scale. Further, the size of the metal compound lubricant is 100nm to 600 nm. By adding the nano-level metal compound lubricant, the compatibility with rubber and the self-dispersion uniformity are further improved, agglomeration is not easy to occur, and the rubber with excellent performance is favorably prepared.
In the application, the rubber comprises 5-20 parts by weight of the amide slipping agent, so that the lubricating property of the rubber is effectively improved, the frictional resistance is remarkably reduced, the content is not excessive, the rubber can be uniformly dispersed, and the physical property of the rubber is not influenced. Specifically, the rubber may include, but is not limited to, 7 parts by weight, 9 parts by weight, 10 parts by weight, 12 parts by weight, 15 parts by weight, 18 parts by weight, or 19 parts by weight of the amide-based slipping agent. In one embodiment of the present application, the amide slip agent comprises at least one of oleamide and erucamide. The oleamide belongs to unsaturated fatty amide, can effectively improve the viscosity of a system, simultaneously, the amido can improve the surface tension, can adjust the compatibility among all components to a certain degree, simultaneously plays a role in lubrication, and prolongs the service life of rubber; erucamide has excellent stability, reduces the dynamic and static friction coefficient on the surface of rubber, gives the rubber self-lubricating effect, promotes the shock attenuation effect.
In this application, three kinds of lubricating material of polytetrafluoroethylene, metallic compound class lubricant and the smooth agent of amide class use simultaneously, mutually support, the synergism to make rubber can be in the state of self-lubricating for a long time, the shock attenuation effect is excellent, avoids the production of abnormal sound, prolongs rubber life greatly. The polytetrafluoroethylene, the metal compound lubricant and the amide slipping agent have low solubility and general compatibility in rubber, and the weight ratio of the polytetrafluoroethylene, the metal compound lubricant and the amide slipping agent is low, so that the problems of uneven dispersion and agglomeration are avoided, and the mechanical property and the fatigue resistance of the rubber are reduced; the three are used simultaneously, so that the problem that the rubber cannot keep self-lubricating for a long time due to the fact that the lubricating effect is general when only one or two lubricating materials are used is also avoided.
In the present application, both the polytetrafluoroethylene and the metal compound-based lubricant are solid lubricating materials. In one embodiment of the present application, the mass ratio of the polytetrafluoroethylene to the metal compound-based lubricant is (1-3): 1. the compatibility of the polytetrafluoroethylene in the rubber is slightly better than that of the metal compound lubricant in the rubber, the polytetrafluoroethylene and the metal compound lubricant can be well dispersed in the rubber through the arrangement, the improvement of the mechanical property of the rubber is facilitated, meanwhile, the polytetrafluoroethylene and the metal compound lubricant can be matched with each other, the long-term self-lubricating effect of the rubber is improved, and the phenomenon that the tensile property of the rubber is influenced due to the agglomeration caused by excessive content of the metal compound lubricant is avoided. Specifically, the mass ratio of the polytetrafluoroethylene to the metal compound lubricant may be, but is not limited to, 2: 1.
in one embodiment of the present application, the mass ratio of the polytetrafluoroethylene to the metal compound-based lubricant to the amide-based lubricant is (1-3): 1: (5-15). Further, the mass ratio of the polytetrafluoroethylene to the metal compound lubricant to the amide slipping agent is (1-2): 1: (7-13). Specifically, the mass ratio of the polytetrafluoroethylene to the metal compound lubricant to the amide lubricant may be, but is not limited to, 2: 1: 10. therefore, the polytetrafluoroethylene, the metal compound lubricant and the amide slipping agent can act synergistically, and the self-lubricating and damping effects of the rubber are greatly improved.
In the present application, the lipophilic polyglycerol ester is included in the rubber in an amount of 2 to 10 parts by weight. The lipophilic polyglycerol ester is polyglycerol ester with HLB (hydrophilic-lipophilic balance) value less than 10; the lipophilic polyglycerol ester can be well dispersed in the rubber, promotes substances incompatible with the main rubber to be well dispersed in the main rubber, particularly promotes the compatibility of the lubricating material and the main rubber, and enhances the dispersion uniformity of the lubricating material. Specifically, the rubber may include, but is not limited to, 3 parts by weight, 5 parts by weight, 6 parts by weight, 8 parts by weight, 9 parts by weight, or 10 parts by weight of the lipophilic polyglycerol ester. In one embodiment of the present application, the lipophilic polyglycerol ester includes at least one of triglycerol distearate, hexaglycerol tristearate and hexaglycerol pentastearate, which has good stability and is more favorable for promoting compatibility among the components.
In the present application, the coupling agent is included in the rubber in an amount of 1 to 10 parts by weight. The coupling agent can play a chemical role with the surface of an inorganic substance, so that the compatibility of the inorganic substance in the organic substance is improved, therefore, the coupling agent in the rubber promotes the compatibility of the metal compound lubricant in the rubber, the dispersing performance of the metal compound lubricant is improved, the metal compound lubricant can fully exert the lubricating performance, and the metal compound lubricant is uniformly dispersed in the rubber, and the uniformity of self-lubrication of the rubber is improved. Specifically, the coupling agent may be included in the rubber in, but not limited to, 3 parts by weight, 5 parts by weight, 6 parts by weight, 7 parts by weight, 8 parts by weight, or 10 parts by weight. In one embodiment of the present application, the coupling agent includes at least one of a silane coupling agent and a titanate coupling agent, which can better cause the inside of the rubber to be bent and tangled, enhance the compatibility of organic and inorganic substances, and improve the impact resistance of the rubber. Specifically, the coupling agent may include, but is not limited to, at least one of bis- [ gamma- (triethoxysilyl) propyl ] tetrasulfide and gamma-mercaptopropyltriethoxysilane.
In the present application, the rubber comprises 5 to 83 parts by weight of an auxiliary agent in order to improve the properties of the rubber. Specifically, the rubber may include, but is not limited to, 10 parts by weight, 20 parts by weight, 35 parts by weight, 50 parts by weight, 65 parts by weight, 70 parts by weight, or 75 parts by weight of an auxiliary.
In an embodiment of the present application, the auxiliary includes at least one of a plasticizer, a reinforcing agent, an activator, and an anti-aging agent. The plasticizer can reduce the acting force among main rubber molecules, improve the plasticity and the fluidity of the main rubber, facilitate the mixing of the main rubber and other components, and simultaneously improve the physical and mechanical properties of the rubber; the reinforcing agent improves the mechanical property and the wear damage resistance of the rubber material, and improves the mechanical properties such as heat resistance, hardness and the like of the rubber by being matched with other additives; the activator can activate a vulcanization system, shorten the vulcanization time and improve the crosslinking degree in the rubber; the anti-aging agent can enhance the aging resistance of rubber, effectively slow down the aging speed and the aging degree, and prolong the service life of the rubber material.
In one embodiment of the present application, the auxiliary comprises the following components in parts by weight:
in the application, the rubber performance is further improved, the aging speed and the aging degree are reduced, and the service life of the rubber is prolonged by adopting the auxiliary agent; the content of each component is proper, so that the rubber performance is improved, and the problems of agglomeration and damage to the mechanical property of the rubber caused by overhigh content are avoided.
In the present application, the rubber includes 10 to 30 parts by weight of a plasticizer. Specifically, the rubber may include, but is not limited to, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, or 28 parts by weight of a plasticizer. In one embodiment herein, the plasticizer comprises at least one of fatty hydrocarbon oils, naphthenic oils, aromatic oils, and ester plasticizers.
In the present application, the rubber includes 10 to 30 parts by weight of a reinforcing agent. Specifically, the rubber may include, but is not limited to, 10 parts by weight, 15 parts by weight, 20 parts by weight, 25 parts by weight, or 28 parts by weight of a reinforcing agent. In an embodiment of the present application, the reinforcing agent includes at least one of carbon black, white carbon, calcium carbonate, clay, talc, and diatomaceous earth. In the present application, when the reinforcing agent is included in the rubber, the coupling agent can also act on the surface of the reinforcing agent, promote the compatibility of the reinforcing agent in the rubber, and reduce agglomeration. In one embodiment of the present application, the particle size of the strengthening agent is less than or equal to 10 μm. Thereby being beneficial to the uniform dispersion of the reinforcing agent in the rubber, avoiding the agglomeration phenomenon and ensuring the performance of the rubber.
In the present application, the active agent is included in the rubber in an amount of 5 to 15 parts by weight. Specifically, the rubber may include, but is not limited to, 6 parts by weight, 8 parts by weight, 9 parts by weight, 10 parts by weight, or 14 parts by weight of an active agent. In one embodiment of the present application, the active agent comprises at least one of zinc oxide, zinc carbonate, zinc stearate, stearic acid, sodium stearate salt, and potassium stearate salt. In another embodiment of the present application, the particle size of the active agent is on the nanometer scale. Further, the particle size of the active agent is less than 500 nm. Thus, the nano-sized active agent can more effectively promote the vulcanization process.
In the present application, the rubber contains 5 to 8 parts by weight of an antioxidant. Specifically, the rubber may include, but is not limited to, 5 parts by weight, 6 parts by weight, 7 parts by weight, or 8 parts by weight of an antioxidant. In one embodiment of the present application, the antioxidant comprises at least one of N-isopropyl-N '-phenyl-p-phenylenediamine, N' -ditolyl-p-phenylenediamine, 2, 4-trimethyl-1, 2-dihydroquinoline polymer, microcrystalline wax, and paraffin wax.
In the application, the main rubber is used as the main component of the self-lubricating rubber material and is matched with other components, the performance of the main rubber is further improved on the basis of ensuring the performances of wear resistance, damping, shock absorption, tensile resistance and the like of the main rubber, so that the rubber capable of separating out the lubricating material and keeping the long-term self-lubricating effect is prepared, the excellent shock absorption effect is achieved, and the generation of abnormal sound in the use process is avoided. In the present application, the main rubber may include at least one of natural rubber, synthetic rubber, and modified rubber. In an embodiment of the application, the main rubber comprises at least one of natural rubber, styrene-butadiene rubber, chloroprene rubber, ethylene propylene rubber, nitrile rubber and isoprene rubber, so that the rubber has good mechanical properties and fatigue resistance.
In the application, the vulcanizing agent and the vulcanization accelerator can promote rubber to generate crosslinking, the linear structure is changed into a three-dimensional network structure, other components can be uniformly dispersed in the linear structure, and the rubber performance is improved. In one embodiment of the present application, the rubber includes 2 to 5 parts by weight of a vulcanizing agent, and 2 to 7 parts by weight of a vulcanizing agent accelerator. Specifically, the rubber may include, but is not limited to, 2 parts by weight, 3 parts by weight, 4 parts by weight, or 5 parts by weight of a vulcanizing agent, 2 parts by weight, 4 parts by weight, 5 parts by weight, or 6 parts by weight of a vulcanizing agent accelerator. In one embodiment herein, the vulcanizing agent comprises at least one of sulfur, 4-4' -dimorpholine disulfide, tetramethylthiuram disulfide, dipentamethylenethiuram tetrasulfide, and disulfide dichloride. In another embodiment of the present application, the vulcanization accelerator includes at least one of a sulfenamide type accelerator, a dithiocarbamate type accelerator, a thiuram type accelerator, and a thiazole type accelerator. Further, the sulfenamide-based accelerator includes at least one of N-cyclohexyl-2-phenylpropylthiothiazolesulfonamide and N-tert-butyl-2-benzothiazosulfonamide, the dithiocarbamate-based accelerator includes at least one of zinc dibutyldithiocarbamate and zinc diethyldithiocarbamate, the thiuram-based accelerator includes tetraethylthiuram disulfide, and the thiazole-based accelerator includes at least one of 2-mercaptobenzothiazole and 2, 2' -dithiodibenzothiazole. Thereby further promoting the vulcanization effect and shortening the vulcanization time.
Referring to fig. 1, a flow chart of a rubber preparation method according to an embodiment of the present application includes:
operation 101: plasticizing 100 parts by weight of main rubber, and mixing with 1 part by weight to 3 parts by weight of polytetrafluoroethylene, 0.5 part by weight to 2 parts by weight of metal compound lubricant, 1 part by weight to 10 parts by weight of coupling agent, 2 parts by weight to 10 parts by weight of lipophilic polyglycerol ester, 5 parts by weight to 20 parts by weight of amide slipping agent and 5 parts by weight to 83 parts by weight of auxiliary agent to prepare the co-mixed rubber.
Operation 102: and mixing the blended rubber with a vulcanizing agent and a vulcanization accelerator, and vulcanizing to obtain the rubber.
In the application, the rubber with self-lubricating effect and excellent shock absorption performance is prepared by mixing main rubber, polytetrafluoroethylene, a metal compound lubricant, a coupling agent, lipophilic polyglycerol ester and an amide slipping agent auxiliary agent and vulcanizing; the method is simple and convenient to operate, and the rubber with excellent performance can be obtained, thereby being beneficial to the application of the rubber.
In one embodiment of the present application, operation 101 further includes mixing polytetrafluoroethylene and a metal compound lubricant, and adding a coupling agent to form a first mixture; mixing the first mixture with lipophilic polyglycerol ester and amide slipping agent to form a second mixture; and plasticizing the main rubber, and mixing the main rubber with the second mixture and the auxiliary agent to obtain the blended rubber. The components with the lubricating effect are premixed and then mixed with the main rubber, so that the dispersing performance of the components with the lubricating effect is greatly improved, and the performance of the rubber is improved.
Referring to fig. 2, a flow chart of a rubber preparation method according to another embodiment of the present application includes:
operation 201: mixing 1-3 parts by weight of polytetrafluoroethylene and 0.5-2 parts by weight of metal compound lubricant, and adding 1-10 parts by weight of coupling agent to form a first mixture;
operation 202: mixing the first mixture with 2-10 parts by weight of lipophilic polyglycerol ester and 5-20 parts by weight of amide slipping agent to form a second mixture;
operation 203: plasticizing 100 parts by weight of main rubber, and mixing with the second mixture and 5-83 parts by weight of auxiliary agent to obtain blended rubber;
operation 204: and mixing the blended rubber with a vulcanizing agent and a vulcanization accelerator, and vulcanizing to obtain the rubber.
In operation 201, the ptfe, the metal compound-based lubricant, and the coupling agent are mixed, thereby improving the surface properties of the ptfe and the metal compound-based lubricant to facilitate mixing with the main rubber. In one embodiment of the present application, the mass ratio of the polytetrafluoroethylene to the metal compound lubricant is (1-3): 1.
in an embodiment of the present application, forming a first mixture further comprises: mixing polytetrafluoroethylene and a metal compound lubricant, adding 1-10 parts by weight of a surfactant, uniformly mixing, and adding a coupling agent to form a first mixture. By adding the surfactant, the compatibility among main rubber is favorably improved, the interface binding force is enhanced, and the performance of the rubber is improved. Further, the polytetrafluoroethylene, the metal compound lubricant and the surfactant are mixed for 20min to 60min, and then the coupling agent is added and mixed for 30min to 90min, so that the components are uniformly dispersed.
In operation 202, the first mixture, lipophilic polyglycerol ester, and amide slip agent are mixed to further enhance the dispersancy properties of the components.
In an embodiment of the present application, forming a second mixture further comprises: the first mixture is mixed with a lipophilic polyglycerol ester, an amide slip agent, and a strengthening agent to form a second mixture. The second mixture is preformed by adding the reinforcing agent to facilitate mixing with the host rubber. In the present application, when the auxiliary agent includes a strengthening agent, it may be added during the formation of the second mixture to increase the strength of the second mixture. In one embodiment, 10 to 30 parts by weight of the strengthening agent is added to the second mixture. Further, 5 to 10 parts by weight of a reinforcing agent is added to the second mixture. In the present application, the reinforcing agent may be added in one part in forming the second mixture and in another part when subsequently mixed with the host rubber. In another embodiment, forming the second mixture includes mixing at 50 ℃ to 90 ℃ for 30min to 90min such that the components are thoroughly mixed.
In the application, after the components with the lubricating effect are premixed and subjected to surface treatment through operation 201 and operation 202, the wettability of the lubricating components is improved, meanwhile, the lipophilic polyglycerol ester can be wrapped and pre-dispersed and then mixed with the main rubber, so that the dispersibility of the components with the lubricating effect in the rubber is greatly improved, and the performance of the rubber is improved.
In the present application, operation 203 is a one-step glue preparation process. In one embodiment of the present application, bulk rubber plasticizing includes plasticizing at 60 ℃ to 100 ℃ for 5min to 10 min. Thereby facilitating the compatibility of the host rubber with the second mixture. Further, the plasticizing comprises plasticizing at 70-85 ℃ for 5-8 min. In another embodiment of the present application, the plasticizing of the body rubber with the second mixture, the auxiliary agent, comprises: and plasticizing the main rubber, placing the second mixture and the auxiliary agent into an internal mixer, and mixing for 5-8 min to fully mix the components. Further, discharging at 100-150 ℃ to prepare the blended rubber, namely the first-stage rubber.
In the present application, operation 204 is a process for preparing a two-stage adhesive. In an embodiment of the present application, the blending rubber is mixed with a vulcanizing agent and a vulcanization accelerator, and the rubber obtained after vulcanization includes: placing the co-mixed rubber, a vulcanizing agent and a vulcanization accelerator in an internal mixer for mixing for 3min-5min, wherein the temperature is not more than 85 ℃, the thickness of the thin tube is 2mm, and the mixed rubber material is prepared after the thin tube is passed for 3 times; and putting the mixed rubber material into an injection molding machine, vulcanizing at the charging barrel temperature of 75-85 ℃ and the temperature of 150-190 ℃ for 300-500 s under the pressure of 2.5-5 MPa.
The preparation method of the rubber is simple, convenient to operate, capable of realizing large-scale production and beneficial to wide application.
The application also provides the application of the rubber in the shock absorption piece. In this application, this rubber can keep self-lubricating property for a long time, and coefficient of friction is little, and the wearability is good, and mechanical properties and fatigue durability are excellent, when being applied to the damper, can greatly reduce the frictional force between damper and the product to eliminate the abnormal sound because of the friction causes, be favorable to its use.
In an embodiment of the present application, the shock absorbing member may be, but is not limited to, a bushing. In one embodiment, the bushing is an automotive bushing. In the vehicle road test process, the conventional bushing can rub against other parts in the process to generate huge abnormal sound, so that the vehicle performance is influenced. The bushing made of the rubber provided by the application can generate a self-lubricating effect for a long time, and greatly improves the damping amplitude, so that abnormal sound is avoided; compared with the lubricant coating, the bushing provided by the application does not need an additional coating process, and the problem of part contamination caused by additional coating is avoided.
Example 1
Mixing 2 parts by weight of polytetrafluoroethylene and 1 part by weight of tungsten disulfide (particle size of 300nm), then adding 1 part by weight of lignosulfonate, stirring for 30min, then adding 1 part by weight of coupling agent Si-69, and stirring and mixing for 1h to obtain a first mixture.
Heating 5 parts by weight of hexaglycerol pentastearate in a water bath at 80 ℃ under stirring, slowly adding the first mixture, continuously adding 10 parts by weight of oleamide, adding 10 parts by weight of carbon black N550 according to the formula, stirring to form a liquid sticky matter, and continuously keeping the temperature and heating for 1 hour to form a second mixture.
The rubber mixing process is carried out according to GB/T6038-2006 GBT 6038-: plasticizing 100 parts by weight of natural rubber in an internal mixer for 5-10min, and controlling the temperature of the internal mixer to be less than 100 ℃.
Mixing the plasticized natural rubber with 10 parts by weight of carbon black N550, 25 parts by weight of paraffin oil KP6030, 7 parts by weight of zinc oxide, 1 part by weight of stearic acid SA, 1 part by weight of anti-aging agent 4020 and 3 parts by weight of microcrystalline wax, adding the mixture into an internal mixer for mixing, continuously controlling the temperature, mixing for 180s, discharging the mixture until the temperature reaches 130 ℃, thinly passing the mixture through an open mill for three times, discharging the mixture, and cooling the mixture to room temperature for later use.
And adding the product, 1.8 parts by weight of sulfur and 2 parts by weight of vulcanization accelerator into an internal mixer for mixing for 240s, controlling the temperature to be less than or equal to 85 ℃, thinly passing through an open mill, then taking out a sheet to form a rubber material, and vulcanizing for 480s at 160 ℃ to obtain the rubber.
Example 2
The same as example 1 except that no lignosulfonate was added.
Example 3
The procedure was as in example 1 except that 3 parts by weight of polytetrafluoroethylene and 0.5 part by weight of tungsten disulfide were added.
Example 4
The same as example 1 except that 10 parts by weight of oleamide was changed to 10 parts by weight of erucamide and 1 part by weight of tungsten disulfide was changed to 1 part by weight of molybdenum disulfide.
Example 5
The procedure was repeated in substantially the same manner as in example 1 except that 1 part by weight of polytetrafluoroethylene, 2 parts by weight of tungsten disulfide, 5 parts by weight of oleamide, 2 parts by weight of hexaglycerol pentastearate, and 10 parts by weight of a coupling agent Si-69 were added.
Example 6
The procedure was repeated in substantially the same manner as in example 1 except that 2.5 parts by weight of polytetrafluoroethylene, 1.5 parts by weight of tungsten disulfide, 20 parts by weight of oleamide, 10 parts by weight of hexaglycerol pentastearate, and 5 parts by weight of a coupling agent Si-69 were added.
Example 7
The difference was that tungsten disulfide had a particle size of 1 μm, which was substantially the same as in example 1.
Example 8
The difference is that the manufacturing process is substantially the same as that of the embodiment 1:
plasticizing 100 parts by weight of natural rubber in an internal mixer for 5-10min, and controlling the temperature of the internal mixer to be less than 100 ℃.
Mixing the plasticized natural rubber with 2 parts by weight of polytetrafluoroethylene, 1 part by weight of tungsten disulfide, 1 part by weight of lignosulfonate, 1 part by weight of coupling agent Si-69, 10 parts by weight of oleamide, 20 parts by weight of carbon black N550, 25 parts by weight of paraffin oil KP6030, 7 parts by weight of zinc oxide, 1 part by weight of stearic acid SA, 1 part by weight of anti-aging agent 4020 and 3 parts by weight of microcrystalline wax, adding the mixture into an internal mixer for mixing, continuously controlling the temperature, mixing for 180s, discharging at 130 ℃, thinly passing the mixture through an open mill for three times, discharging, and cooling the mixture to room temperature for later use.
And adding the product, 1.8 parts by weight of sulfur and 2 parts by weight of vulcanization accelerator into an internal mixer for mixing for 240s, controlling the temperature to be less than or equal to 85 ℃, thinly passing through an open mill, then taking out a sheet to form a rubber material, and vulcanizing for 480s at 160 ℃ to obtain the rubber.
Comparative example 1
The procedure was as in example 1, except that no hexaglycerol pentastearate was added.
Comparative example 2
The same as in example 1, except that the coupling agent Si-69 and lignosulfonate were not added.
Comparative example 3
The procedure was as in example 1 except that no polytetrafluoroethylene, tungsten disulfide and oleamide were added.
Comparative example 4
The difference was that polytetrafluoroethylene was not added, substantially the same as in example 1.
Comparative example 5
The difference was that tungsten disulfide was not added, which was the same as in example 1.
Comparative example 6
The procedure was as in example 1 except that oleamide was not added.
Comparative example 7
The composition was substantially the same as in example 1, except that the amount of polytetrafluoroethylene added was changed to 10 parts by weight.
Comparative example 8
The procedure was as in example 1 except that the amount of tungsten disulfide added was changed to 5 parts by weight.
Comparative example 9
The procedure was repeated in substantially the same manner as in example 1 except that the amount of oleamide added was changed to 30 parts by weight.
Comparative example 10
The procedure was repeated in substantially the same manner as in example 1 except that the amount of the hexaglycerol monostearate was changed to 18 parts by weight.
The rubbers prepared in the above examples and comparative examples were made into bushings, and the tensile strength, elongation at break and tear strength were measured according to GB/T528-; the fatigue durability test comprises the steps that the manufactured rubber bushing is placed on a universal fatigue test stand, a standard tool is fixed on a base at the lower part of the universal fatigue test stand, a flat plate is adopted to apply a load of 3KN at the upper part of the universal fatigue test stand, the frequency of the stand is 5HZ, and the test is carried out until the appearance of a product is seriously damaged or the rubber cracks or the rubber and a metal piece crack; the simulated car-loading abnormal sound test comprises sleeving a prepared rubber bushing with a polyamide part, placing the rubber bushing on a test bench (vibration simulation tester VS-2001 in bright colors), vibrating at 20HZ and 3KN load, and distinguishing whether abnormal sound of rubber friction is generated in the test process, wherein the polyamide part is prepared by mixing polyamide (PA66-GF33) with 33% of glass fiber; the results of the above measurements are shown in Table 1.
TABLE 1 bushing Performance test results
As can be seen by the tests, compared with the examples, the comparative examples 1-2 do not contain hexaglycerol pentastearate, a coupling agent or a surfactant, the lubricating material in the rubber may be unevenly dispersed, and the prepared bushing generates abnormal sound in the simulated loading abnormal sound test and has obviously reduced fatigue durability; the comparative examples 3 to 6 do not contain lubricating materials, so that the produced bushing generates very obvious abnormal sound in the test of simulating the abnormal sound of loading, the use requirement cannot be met, and the fatigue durability is also obviously reduced; the selection of each component in comparative examples 7 to 10 exceeds a certain range, resulting in the production of a bush having abnormal noise in the simulated car-loading abnormal noise test and a significant reduction in fatigue durability and mechanical properties. Therefore, the bush that the rubber that this application provided was made can avoid the production of abnormal sound completely in the test of simulation loading abnormal sound, has improved the performance of bush, still has excellent fatigue durability and mechanical properties simultaneously, accords with the user demand.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The rubber is characterized by comprising the following components in parts by weight:
and a vulcanizing agent and a vulcanization accelerator.
2. The rubber of claim 1, further comprising 1 part to 10 parts by weight of a surfactant comprising at least one of sodium linear alkylbenzene sulfonate, polysorbate, and lignosulfonate.
3. The rubber according to claim 1, wherein the mass ratio of the polytetrafluoroethylene to the metal compound-based lubricant is (1-3): 1.
4. the rubber of claim 1, wherein the host rubber comprises at least one of natural rubber, styrene-butadiene rubber, cis-butadiene rubber, neoprene rubber, ethylene-propylene rubber, nitrile rubber, and isoprene rubber;
the auxiliary agent comprises at least one of a plasticizer, a reinforcing agent, an active agent and an anti-aging agent;
the metal compound lubricant comprises at least one of molybdenum disulfide, tungsten disulfide, niobium diselenide, tungsten diselenide, ferroferric oxide, aluminum oxide, lead oxide, ferric chloride, cadmium iodide, lead iodide and mercury iodide;
the amide slipping agent comprises at least one of oleamide and erucamide;
the lipophilic polyglycerol ester comprises at least one of triglycerol distearate, hexaglycerol tristearate and hexaglycerol pentastearate;
the coupling agent comprises at least one of a silane coupling agent and a titanate coupling agent;
the vulcanizing agent comprises at least one of sulfur, 4-4' -dimorpholinyl disulfide, tetramethylthiuram disulfide, dipentamethylenethiuram tetrasulfide and disulfide dichloride;
the vulcanization accelerator comprises at least one of sulfenamide accelerators, dithiocarbamate accelerators, thiuram accelerators and thiazole accelerators.
5. The rubber according to claim 1, wherein the auxiliary comprises the following components in parts by weight:
6. the rubber of claim 5, wherein the plasticizer comprises at least one of a fatty hydrocarbon oil, a naphthenic oil, an aromatic oil, and an ester plasticizer;
the reinforcing agent comprises at least one of carbon black, white carbon black, calcium carbonate, argil, talcum powder and diatomite;
the active agent comprises at least one of zinc oxide, zinc carbonate, zinc stearate, stearic acid, sodium stearate salt and potassium stearate salt;
the anti-aging agent comprises at least one of N-isopropyl-N '-phenyl-p-phenylenediamine, N' -ditolyl-p-phenylenediamine, 2, 4-trimethyl-1, 2-dihydroquinoline polymer, microcrystalline wax and paraffin.
7. A method for preparing rubber, comprising:
plasticizing 100 parts by weight of main rubber, and mixing with 1 part by weight to 3 parts by weight of polytetrafluoroethylene, 0.5 part by weight to 2 parts by weight of metal compound lubricant, 1 part by weight to 10 parts by weight of coupling agent, 2 parts by weight to 10 parts by weight of lipophilic polyglycerol ester, 5 parts by weight to 20 parts by weight of amide slipping agent and 5 parts by weight to 83 parts by weight of auxiliary agent to prepare a co-mixed rubber;
and mixing the blended rubber with a vulcanizing agent and a vulcanization accelerator, and vulcanizing to obtain the rubber.
8. The method of claim 7, wherein the preparing the alloy comprises:
mixing the polytetrafluoroethylene and the metal compound lubricant, and adding the coupling agent to form a first mixture;
mixing said first mixture with said lipophilic polyglycerol ester, said amide slip agent to form a second mixture;
and plasticizing the main rubber, and mixing the plasticized main rubber with the second mixture and the auxiliary agent to obtain the blended rubber.
9. The method of claim 8, wherein forming the first mixture further comprises:
and mixing the polytetrafluoroethylene and the metal compound lubricant, adding 1-10 parts by weight of surfactant, uniformly mixing, and adding the coupling agent to form the first mixture.
10. Use of a rubber according to any one of claims 1 to 6 or obtained by the process according to any one of claims 7 to 9 in a shock-absorbing member.
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| CN117254659A (en) * | 2023-11-16 | 2023-12-19 | 荣耀终端有限公司 | Motor, lens module and terminal device |
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| CN116874894B (en) * | 2023-07-10 | 2024-02-09 | 昆山力普电子橡胶有限公司 | Automobile rubber shock pad and preparation method thereof |
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