A low friction coefficient and high wear resistance EPDM rubber composition, mixed rubber and preparation method and application thereof
By developing EPDM rubber compositions and mixing rubber with low friction coefficient and high wear resistance, combined with automated production processes, the problems of insufficient energy consumption, carbon emissions and wear resistance of traditional automotive seal strip production processes have been solved, and more environmentally friendly and High-performance sealing strip product.
Patent Information
- Application Number
- CN202411214878.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2024-12-31
- Estimated Expiration
- 2044-09-02
AI Technical Summary
Traditional automotive seal strip production processes have problems such as high energy consumption, large carbon emissions, dust pollution caused by spraying or flocking processes and insufficient wear resistance of products, especially water cutting and extrusion and permanent deformation of PVC materials, resulting in poor product performance. .
Develop a low friction coefficient and high wear resistance EPDM rubber composition and mixing glue, through specific formulas and automated production processes, including EPDM raw rubber, carbon black, reinforcement powder, paraffin oil, ultra-high molecular weight polyethylene and other raw materials. The method of high-speed high-pressure mixing and segmented mixing machines is used to cancel the spraying or flocking process to improve the wear resistance of the product.
It achieves lower carbon emissions, improves the wear resistance of the product, ensures automation and environmental protection of the production process, and improves the wear resistance of the product to 1Kg load and has wear resistance of more than 30,000 times.
Smart Images
Figure CN118725472B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of automobile sealing strip manufacturing, and in particular to an EPDM rubber composition with low friction coefficient and high wear resistance for automobile sealing strip, a rubber compound and a preparation method thereof. Background Art
[0002] As my country's environmental protection requirements become increasingly stringent, the sealing strip industry will also implement relevant control measures such as carbon emissions and carbon footprints in the future. The coating material on the surface of the sealing strip has been changed from solvent-based coatings to water-based coatings, but water-based coatings still contain a small amount of organic solvents, and the dust pollution generated during the spraying process still has some impact on the environment; at the same time, in order to further improve the wear resistance of the surface of the glass guide groove sealing strip, the use of low friction coefficient and high wear-resistant EPDM compound and ordinary EPDM compound co-extruded to replace the spraying process on the surface of the EPDM guide groove has become a new technological innovation trend. Summary of the invention
[0003] In view of this, the present invention discloses an EPDM rubber composition with low friction coefficient and high wear resistance, a mixed rubber, and a preparation method and application thereof.
[0004] It should be noted that the traditional automotive sealing strip guide groove or water cutting extrusion production process is Figure 1-Figure 3 .in Figure 1 The above is the mainstream production process. Most products are produced by this process. Its advantages are that the EPDM material has excellent aging resistance, good compression permanent deformation, good product quality, and the wear resistance requirements can meet the requirements of GB / T21282-2007 standard of 1Kg load and more than 10,000 times of wear resistance; the disadvantages are high energy consumption, and the spraying or flocking process will produce organic volatile waste gas, and the overall carbon emission is high; Figure 2 The process mainly produces water-cut products. Guide groove products are rarely used due to the poor compression permanent deformation of TPV materials and abnormal noise in aftermarket vehicles. Figure 3 The process described above has few use cases and is an eliminated process because of the poor compression permanent deformation and temperature resistance of PVC materials, as well as the influence of plasticizers in PVC.
[0005] In the present invention, a low friction coefficient and high wear resistance EPDM rubber formula is successfully developed and applied, which makes the production process of automobile sealing strip guide groove or water cutting have another option. This process combines Figure 1 and Figure 2 The advantages of the process while avoiding their respective disadvantages, while ensuring product performance, simplifying the production process, eliminating the spraying or flocking process, reducing carbon emissions, and at the same time improving the product's wear resistance to a load of 1Kg and a wear resistance of more than 30,000 times.
[0006] In order to achieve the above object, the present invention adopts the following technical solution:
[0007] The first technical purpose of the present invention is to provide an EPDM rubber composition with low friction coefficient and high wear resistance, wherein the rubber composition comprises the following raw materials in parts by weight:
[0008] EPDM raw rubber (Mitsui Chemicals K9720 raw rubber) 100 parts, carbon black N-550 50-70 parts, reinforcing powder E1 5-15 parts, paraffin oil 5-10 parts, ultra-high molecular weight polyethylene 40-60 parts, polyethylene wax 5-10 parts, zinc oxide 5-8 parts, stearic acid 1-2 parts, PEG-4000 1-2 parts, calcium oxide 3-5 parts, sulfur 0.5-1 parts, accelerator EG-3M 1.5-2 parts, scorch retarder E-80 0.6-1 parts.
[0009] Preferably, the carbon black is furnace N-550 carbon black.
[0010] Preferably, the reinforcing powder is a mixture of silicon dioxide, aluminum silicate and the like.
[0011] Preferably, the scorch retarder is N-phenyl-N(trichloromethyl-sulfonyl)-phenylsulfonylanilide.
[0012] The second object of the present invention is to provide an EPDM rubber compound with low friction coefficient and high wear resistance, wherein the rubber compound is prepared by using the above-mentioned EPDM rubber composition with low friction coefficient and high wear resistance.
[0013] The invention also discloses a method for preparing the EPDM rubber compound with low friction coefficient and high wear resistance, which is as follows:
[0014] S1, the materials of stage I are automatically fed into the fully enclosed internal mixer through the fully enclosed automatic conveying system and the fully enclosed feeding system for internal mixing. High-speed and high-pressure mixing is first adopted, wherein the rotor speed is 35-40r / min, the upper push bolt pressure is 12-16MPa, the temperature is raised to 130-140℃, the upper push bolt is lifted, the rotor speed is reduced to 30-35r / min, the mixing time is 4-6 minutes, and when the temperature rises to 170-180℃, the system automatically discharges the materials; the whole process is fully automatically controlled feeding, without manual operation;
[0015] S2, the rubber material discharged from step S1 enters the open mixing mill once, and the sheet is wetted by the isolation liquid in the isolation tank and hung on the sheet cooling machine. After air cooling, it is weighed and moved into a special rubber mixing transfer vehicle, and parked and cooled to 50-70°C;
[0016] S3, put the weighed stage I mixed rubber produced in step S2 into the internal mixer 2, and pour in the small stage II material, press down the top plug, and set the top plug pressure at 0.5-0.6Kgf / cm 2, mix for 100-120 seconds and then drain the glue, the temperature of draining glue is 80-100℃;
[0017] S4, the rubber material discharged from step S3 enters the second mixing mill for one time, and the sheet is produced after the rubber is swung for 60-70 seconds. After being soaked in the isolation liquid in the isolation tank, it is hung on the sheet cooler, and after being air-cooled, it is weighed and moved into a special rubber mixing transfer vehicle. After passing the inspection, it is transferred to the extrusion process.
[0018] Preferably, the materials in stage I are EPDM raw rubber (Mitsui Chemicals K9720 raw rubber), carbon black, reinforcing powder, paraffin oil, ultra-high molecular weight polyethylene, polyethylene wax, zinc oxide, stearic acid, polyethylene glycol, and calcium oxide.
[0019] Preferably, the small materials in stage II are vulcanizing agent, accelerator and scorch retarder.
[0020] Preferably, the step S1 further comprises: the materials in section I are automatically weighed by the laying machine and then transported to a fully enclosed automatic conveying system.
[0021] Preferably, in step S2, the sheet width of the open mixing mill 1 is 250-350 mm, and the thickness is 8-10 mm.
[0022] Preferably, in step S4, the sheet width of the second mixing mill is 20-30 mm and the thickness is 6-8 mm.
[0023] It should be noted that the present invention puts the raw materials into the internal mixer in batches and sections, and the system automatically puts in the mixing, and the overall equipment automation level is high; the materials are not put into the open mixer, the open processing links are fewer, there is no dust flying outside, and the workshop environment is better.
[0024] The third technical purpose of the present invention is to provide the use of the EPDM rubber compound with low friction coefficient and high wear resistance as described above in the field of vehicles.
[0025] Specifically, the EPDM rubber compound with low friction coefficient and high wear resistance prepared by the present invention can be used for automobile sealing strips.
[0026] Compared with the prior art, the present invention has the following beneficial effects:
[0027] (1) The present invention uses ultra-high molecular weight polyethylene to make the rubber mix have low friction and good wear resistance. At the same time, the use of EPDM raw rubber with a high ethylene content increases the hardness and fluidity of the rubber mix, improves the wear resistance and increases the fluidity of the rubber mix during extrusion processing.
[0028] (2) The present invention combines the advantages of tradition and avoids the disadvantages. While ensuring product performance, it simplifies the production process, eliminates the spraying or flocking process, reduces carbon emissions, and improves the wear resistance of the product.
[0029] (3) The present invention puts the raw materials into the internal mixer in batches and sections, and the system automatically puts in and mixes them, so the overall equipment automation level is high; the materials are not put into the open mixer, the open processing links are reduced, there is no dust flying outside, and the workshop environment is better.
[0030] (4) Since the low friction coefficient and high wear resistance EPDM compound rubber prepared by the present invention is similar to the raw rubber used in the ordinary EPDM material used in automobile sealing strips, the two have good compatibility. Through the co-extrusion technology, unqualified products in the spraying or flocking process are eliminated, and the stability and yield rate of the production process are improved. BRIEF DESCRIPTION OF THE DRAWINGS
[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0032] Figure 1 This is the production process diagram of traditional automobile sealing strip guide groove (EPDM material) or water cutting extrusion.
[0033] Figure 2 This is the production process diagram of traditional automobile sealing strip guide groove (TPV material) or water cutting extrusion.
[0034] Figure 3 This is the production process diagram of traditional automobile sealing strip guide groove (PVC material) or water cutting extrusion.
[0035] Figure 4 It is a production process diagram of water-cut extrusion of the present invention.
[0036] Figure 5 It is a preparation process diagram of the rubber compound of the present invention. DETAILED DESCRIPTION
[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0038] The word "embodiment" used here as an "exemplary" does not necessarily mean that any embodiment described is superior to or better than other embodiments. Unless otherwise specified, the performance index tests in the embodiments of this application are performed using conventional test methods in the art. It should be understood that the terms described in this application are only used to describe specific implementation methods and are not used to limit the content disclosed in this application.
[0039] Unless otherwise specified, the technical and scientific terms used in this document have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs; other experimental methods and technical means not specifically specified in this application refer to experimental methods and technical means commonly used by ordinary technicians in this field.
[0040] In order to better illustrate the content of the present application, numerous specific details are provided in the specific examples below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In the embodiments, some methods, means, instruments, equipment, etc. well known to those skilled in the art are not described in detail in order to highlight the main purpose of the present application.
[0041] Under the premise of no conflict, the technical features disclosed in the embodiments of the present application can be combined arbitrarily, and the resulting technical solutions belong to the contents disclosed in the embodiments of the present application.
[0042] In order to better understand the present invention, the present invention is further specifically described through the following examples, but it should not be understood as limiting the present invention. Some non-essential improvements and adjustments made by technicians in this field according to the above invention content are also considered to fall within the protection scope of the present invention.
[0043] The raw materials used in the manufacturing examples / embodiments of the EPDM rubber composition with low friction coefficient and high wear resistance in the present invention are as follows:
[0044]
[0045] Unless otherwise specified, the rubber compound obtained in the manufacturing examples / embodiments is prepared by the following method:
[0046] S1, the materials of stage I are automatically fed into the fully enclosed internal mixer through the fully enclosed automatic conveying system and the fully enclosed feeding system for internal mixing. High-speed and high-pressure mixing is first adopted, wherein the rotor speed is 38r / min, the upper push bolt pressure is 12MPa, the temperature is raised to 135℃, the upper push bolt is lifted, the rotor speed is reduced to 33r / min, the mixing time is about 5 minutes, and when the temperature rises to 180℃, the system automatically discharges the materials; the whole process is fully automatically controlled feeding, without manual operation;
[0047] S2, the rubber material discharged from step S1 enters the open mixing mill once, and the sheet is wetted by the isolation liquid in the isolation tank and hung on the sheet cooling machine. After air cooling, it is weighed and moved into a special rubber mixing transfer vehicle, and parked and cooled to 50-70°C;
[0048] S3, put the weighed stage I mixed rubber produced in step S2 into the internal mixer 2, and pour in the small stage II material, press down the top plug, and set the top plug pressure at 0.5-0.6Kgf / cm 2 , mix for 110 seconds and then discharge the glue, the temperature of which is controlled at 80-100℃;
[0049] S4, the rubber material discharged from step S3 enters the second mixing mill for one time, and the rubber is swung for 70 seconds before being discharged into a sheet. After being soaked in the isolation liquid in the isolation tank, it is hung on a sheet cooler, and after being air-cooled, it is weighed and moved into a special rubber mixing transfer vehicle. After passing the inspection, it is transferred to the extrusion process;
[0050] Among them, the materials in Section I are EPDM raw rubber (Mitsui Chemicals K9720 raw rubber), carbon black, reinforcing powder, paraffin oil, ultra-high molecular weight polyethylene, polyethylene wax, zinc oxide, stearic acid, polyethylene glycol, and calcium oxide; the small materials in Section II are vulcanizers, accelerators, and anti-scorch agents.
[0051] Step S1 also includes: the materials in section I are automatically weighed by the laying machine and then transported to the fully enclosed automatic conveying system.
[0052] In step S2, the sheet width of the open mixing mill 1 is 250-350 mm and the thickness is 9 mm;
[0053] In step S4, the sheet width of the second mixing mill is 25 mm and the thickness is 7 mm.
[0054] In addition, in order to further verify and illustrate the superiority of the technical solution claimed in this case over the prior art, the inventor also conducted the following experiments:
[0055] EPDM raw rubber (Mitsui Chemicals K9720 raw rubber) 100 parts, carbon black N-550 50-70 parts, reinforcing powder E1 5-15 parts, paraffin oil 5-10 parts, ultra-high molecular weight polyethylene 20-40 parts, polyethylene wax 10 parts, zinc oxide 5-8 parts, stearic acid 1-2 parts, PEG-4000 1-2 parts, calcium oxide 3-5 parts, sulfur 0.5-1 parts, accelerator EG-3M 1.5-2 parts, scorch retarder E-80 0.6-1 parts.
[0056]
[0057] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for preparing a low friction coefficient and high wear-resistant EPDM rubber compound, characterized in that: The rubber compound is prepared by using an EPDM rubber composition, and the rubber composition comprises the following raw materials in parts by weight: EPDM raw rubber 100 parts, carbon black N-550 50-70 parts, reinforcing powder E1 5-15 parts, paraffin oil 5-10 parts, ultra-high molecular weight polyethylene 40-60 parts, polyethylene wax 5-10 parts, zinc oxide 5-8 parts, stearic acid 1-2 parts, PEG-4000 1-2 parts, calcium oxide 3-5 parts, sulfur 0.5-1 parts, accelerator EG-3M 1.5-2 parts, scorch retarder E-80 0.6-1 parts; The method specifically comprises the following steps: S1, the materials of stage I are automatically fed into the fully enclosed internal mixer through the fully enclosed automatic conveying system and the fully enclosed feeding system for internal mixing. High-speed and high-pressure mixing is first adopted, wherein the rotor speed is 35-40r / min, the upper push bolt pressure is 12-16MPa, the temperature is raised to 130-140℃, the upper push bolt is lifted, the rotor speed is reduced to 30-35r / min, the mixing time is 4-6 minutes, and when the temperature rises to 170-180℃, the system automatically discharges the materials; the whole process is fully automatically controlled feeding, without manual operation; S2, the rubber material discharged from step S1 enters the open mixing mill once, and the sheet is wetted by the isolation liquid in the isolation tank and hung on the sheet cooling machine. After air cooling, it is weighed and moved into a special rubber mixing transfer vehicle, and parked and cooled to 50-70°C; S3, put the weighed stage I mixed rubber produced in step S2 into the internal mixer 2, and pour in the small stage II material, press down the top plug, and set the top plug pressure at 0.5-0.6Kgf / cm 2 , mix for 100-120 seconds and then drain the glue, the temperature of draining glue is 80-100℃; S4, the rubber material discharged from step S3 enters the second mixing mill for one time, and the rubber is swung for 60-70 seconds before being discharged into a sheet. After being soaked in the isolation liquid in the isolation tank, it is hung on a sheet cooler, and after being air-cooled, it is weighed and moved into a special rubber mixing transfer vehicle. After passing the inspection, it is transferred to the extrusion process; The materials in stage I are EPDM raw rubber - Mitsui Chemicals K9720 raw rubber, carbon black, reinforcing powder, paraffin oil, ultra-high molecular weight polyethylene, polyethylene wax, zinc oxide, stearic acid, polyethylene glycol, and calcium oxide; the small materials in stage II are vulcanizers, accelerators, and anti-scorch agents.
2. The method for preparing the EPDM rubber compound with low friction coefficient and high wear resistance according to claim 1, characterized in that: The step S1 also includes: the materials in section I are automatically weighed by the laying machine and then transported to the fully enclosed automatic conveying system.
3. The method for preparing the EPDM rubber compound with low friction coefficient and high wear resistance according to claim 1, characterized in that: In the step S2, the width of the sheet produced by the first open mixing mill is 250-350 mm, and the thickness is 8-10 mm; in the step S4, the width of the sheet produced by the second open mixing mill is 20-30 mm, and the thickness is 6-8 mm.
4. Use of the EPDM rubber compound with low friction coefficient and high wear resistance prepared by the method as claimed in claim 1 in the field of vehicles.