CN121574468A - High-temperature-resistant EPDM (ethylene-propylene-diene monomer) rubber compound for engine sheath suitable for salt bath vulcanization and preparation method thereof - Google Patents
High-temperature-resistant EPDM (ethylene-propylene-diene monomer) rubber compound for engine sheath suitable for salt bath vulcanization and preparation method thereofInfo
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Abstract
本申请涉及混炼胶材料的技术领域，具体公开了一种适用于盐浴硫化的发动机护套用耐高温EPDM混炼胶及其制备方法。本申请公开的一种发动机护套用耐高温EPDM混炼胶，具体包括以下重量份的组分：EPDM生胶100‑150份、填料90‑150份、石蜡油25‑45份、氧化镁4‑7份、分散剂1‑3份、热氧防老剂1‑3份、交联剂4‑8份、助交联剂2‑5份；EPDM生胶由充油EPDM 10675C、低门尼EPDM S505A混合组成；填料由快压出炭黑N550、半补强炭黑N774、硅烷改性高岭土、PEG4000制备得到。本申请提供的方法，可有效平衡胶料的挤出加工性与耐高温性，制得的混炼胶适用于盐浴硫化。This application relates to the technical field of compounded rubber materials, specifically disclosing a high-temperature resistant EPDM compound for engine sleeves suitable for salt bath vulcanization and its preparation method. The high-temperature resistant EPDM compound for engine sleeves disclosed in this application specifically comprises the following components by weight: 100-150 parts EPDM raw rubber, 90-150 parts filler, 25-45 parts paraffin oil, 4-7 parts magnesium oxide, 1-3 parts dispersant, 1-3 parts thermo-oxidative antioxidant, 4-8 parts crosslinking agent, and 2-5 parts co-crosslinking agent; the EPDM raw rubber is composed of oil-extended EPDM 10675C and low Mooney EPDM S505A; the filler is prepared from fast-extrusion carbon black N550, semi-reinforcing carbon black N774, silane-modified kaolin, and PEG4000. The method provided in this application can effectively balance the extrusion processability and high-temperature resistance of the rubber compound, and the resulting compound is suitable for salt bath vulcanization.
Description
Technical Field
The application relates to the technical field of rubber compound materials, in particular to a high-temperature-resistant EPDM rubber compound for an engine sheath suitable for salt bath vulcanization and a preparation method thereof.
Background
At present, the EPDM rubber compound for the traditional engine sheath mostly adopts a sulfur vulcanization system, has limited heat resistance, and can maintain short-term stability at the normal working temperature of an engine room of 120-150 ℃, but the problems of degradation of a crosslinked network, rising of hardness, loss of elasticity and the like are easy to occur after long-term use. In the local high-temperature area of the engine compartment (such as the vicinity of a turbocharger), the instantaneous temperature can reach 200 ℃, and a sheath made of common EPDM rubber compound can crack and embrittle within 3-6 months, so that a wire harness is exposed, and circuit faults and even potential safety hazards are caused.
In order to break through the high temperature resistance bottleneck, the peroxide vulcanization system can form stable carbon-carbon crosslinking bond, so that the EPDM rubber compound can be used for a long time at the high temperature of 150-200 ℃ theoretically. However, conventional peroxide curing is performed in a curing tank, and the low-temperature slow curing characteristic of the conventional peroxide curing is low in production efficiency and high in cost. In contrast, the salt bath vulcanization process has the advantages of high temperature environment and rapid vulcanization within 1-3 minutes, and the salt medium is uniformly transferred in the vulcanization process, so that local oversulfur or undersulfur can be effectively avoided. However, salt bath vulcanization is difficult to adapt to rubber materials, wherein Kong Quexian is easy to generate in the extrusion vulcanization process, EPDM rubber compound is designed to ensure flexibility by adopting lower hardness, the volatile content of auxiliary agents such as plasticizers in low-hardness rubber materials is higher, peroxide is easy to decompose in advance due to local shearing heat during high-speed extrusion, generated gas cannot be discharged in time, and the gas is wrapped to form a hole after the salt bath is rapidly vulcanized and shaped, so that the density of a product is reduced, and the mechanical properties (such as tensile strength) are reduced. Secondly, the flowability and the suitability of the sizing material under the working condition of high-speed extrusion are poor. The viscosity of the low-hardness sizing material is low, but under the combined action of screw shearing and machine head shearing during high-speed extrusion, the dispersion stability of peroxide is reduced, and meanwhile, the friction resistance of the sizing material and a runner of equipment is changed, so that the fluidity is difficult to be accurately matched with the extrusion speed and the vulcanization rhythm.
Therefore, developing an EPDM rubber compound which can fully exert the high temperature resistance advantage of peroxide and adapt to the salt bath rapid vulcanization process becomes a key for solving the dual requirements of high performance and high efficiency in the industry.
Disclosure of Invention
In order to solve the technical problems, the application provides a high-temperature-resistant EPDM rubber compound for an engine sheath suitable for salt bath vulcanization and a preparation method thereof.
The application provides a high-temperature resistant EPDM rubber compound for an engine protection sleeve, which comprises, by weight, 100-150 parts of EPDM rubber, 90-150 parts of filler, 25-45 parts of paraffin oil, 4-7 parts of magnesium oxide, 1-3 parts of dispersing agent, 1-3 parts of thermal oxidation anti-aging agent, 4-8 parts of cross-linking agent and 2-5 parts of auxiliary cross-linking agent;
the EPDM raw rubber is formed by mixing oil-filled EPDM 10675C and low-Mooney EPDM S505A in a weight ratio of 5-8:5-7;
The filler is prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin and PEG4000 in a weight ratio of 5-7:3-5:1-3:0.1-0.3.
The online extrusion vulcanization needs to have good fluidity of the mixed sizing material, is convenient for molding by the screw rod and the die of the extruder, avoids the problems of overlarge extrusion pressure, rough surface or material breakage caused by overlarge viscosity, but cannot cause melt fracture, unstable size and the like caused by overlarge viscosity. In addition, it is considered to reduce the use of paraffin oil to avoid too much generation of pores of low molecular substances. Therefore, the EPDM raw rubber needs to select the high-Mooney oil-filled EPDM 10675C and the low-Mooney EPDM S505A to be used together, so that extrusion performance is met and certain Mooney is reserved.
In the filler system selected by the application, the high-structure quick-extrusion carbon black N550 has good processing fluidity, can endow a product with good physical and mechanical properties, but aggregates of the high-structure quick-extrusion carbon black N550 are dendritic, are easy to form a network structure, can easily adsorb peroxide or bubbles and increase the risk of pore formation, and the semi-reinforcing carbon black N774 with a middle-low structure can reduce the adsorption of the peroxide, avoid bubbles generated by uneven local crosslinking during vulcanization, but the reinforcing efficiency is insufficient to influence the strength of the product. Therefore, the carbon black is selected from the specific amount of the fast extrusion carbon black N550 and the semi-reinforcing carbon black N774. In the salt bath vulcanization process, volatile residual low molecular substances in the sizing material and gas products generated by decomposition of a peroxide vulcanization system can not escape in time because a salt bath medium is in a liquid state, and air holes are easily formed in rubber products in an accumulated manner, and a proper amount of silane modified kaolin is added into the sizing material to effectively inhibit air hole defects. PEG4000 can be wrapped on the surface of filler particles to reduce interaction between the fillers, so that the dispersion of the fillers in a rubber matrix is promoted, the uniformity of the system is improved, the extrusion pressure is reduced, the PEG has certain lubricity, the viscosity of rubber materials can be further reduced, the demolding property and the surface smoothness of an extrudate are improved, the filler can fully play a role, and the controllability of a vulcanization process at a high temperature is ensured.
The application selects the paraffin oil with high flash point and low volatility, reduces volatilization of low molecular substances during high-temperature vulcanization of the peroxide salt bath, avoids gas holes on the cross section of the product from influencing the product performance, ensures the stability of a vulcanization system, and avoids fluctuation of the vulcanization speed or reduction of the crosslinking density caused by volatilization of oil.
The application selects peroxide with high-temperature half-life adapted to the salt bath vulcanization temperature (200-300 ℃) as a cross-linking agent, has half-life of about 1 minute at 200 ℃, is matched with a crosslinking assistant, can optimize vulcanization efficiency, promote crosslinking density and improve rubber product performance through synergistic effect, and can neutralize acidic byproducts (such as tertiary butyl alcohol) generated by decomposition of the peroxide with MgO (the pollution of salt-containing wastewater heavy metal is avoided in the zinc-free formula design), stabilize a vulcanization system, ensure that the crosslinking reaction is synchronous with gas release, and avoid that a large amount of gas cannot be discharged due to too fast decomposition.
The high-temperature resistant EPDM rubber compound for the engine jacket specifically comprises, by weight, 120-140 parts of EPDM raw rubber, 110-130 parts of filler, 30-40 parts of paraffin oil, 5-6 parts of magnesium oxide, 1.5-2.5 parts of dispersing agent, 1.5-2.5 parts of thermal oxidation anti-aging agent, 5-7 parts of cross-linking agent and 3-4 parts of auxiliary cross-linking agent.
Preferably, the EPDM rubber is formed by mixing oil-filled EPDM 10675C and low-Mooney EPDM S505A in a weight ratio of 7-8:5-6.
In a specific embodiment, the weight ratio of oil filled EPDM 10675C, low mooney EPDM S505A in the EPDM raw rubber can be 7:5, 7:6, 8:5, 8:6.
Experimental analysis shows that the EPDM rubber is prepared by mixing the oil-filled EPDM 10675C and the low-Mooney EPDM S505A according to the weight ratio, so that the performance of the finished rubber product can be further improved.
Preferably, the filler is prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin and PEG4000 in a weight ratio of 6-7:3-4:1-2:0.15-0.25.
In a specific embodiment, the filler may be prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin, PEG4000 in a weight ratio of 6.5:3.5:1.5:0.2, 6:3:1:0.2.
Experimental analysis shows that the filler prepared by the quick extrusion carbon black N550, the semi-reinforcing carbon black N774, the silane modified kaolin and the PEG4000 in the weight ratio can further improve the performance of a finished product of the rubber compound.
Preferably, in the filler, the preparation method of the silane modified kaolin comprises the following steps:
The preparation method comprises the steps of placing kaolin into an ethanol aqueous solution of 0.8-1.5wt% of silane coupling agent KH-550, stirring at 60-70 ℃ for reaction for 2-3h, and then drying at 80-90 ℃ for 4-6h to obtain silane modified kaolin, wherein the ethanol aqueous solution is formed by mixing ethanol and water in a volume ratio of 8-10:1, and the pH value is adjusted to 4-5 by acetic acid.
Preferably, the preparation method of the filler comprises the following steps:
Mixing the fast extruded carbon black N550 and the semi-reinforcing carbon black N774, adding dispersion medium ethanol with the total mass of 5-8% of the carbon black, ball milling for 2-3 hours under the conditions of a ball-material ratio of 7-9:1 and a rotating speed of 300-400r/min, drying for 3-4 hours under the conditions of 70-80 ℃, crushing and sieving with a 200-mesh sieve to obtain carbon black mixed powder;
Uniformly mixing silane modified kaolin and carbon black mixed powder at the rotating speed of 800-1000r/min, heating to 60-70 ℃, adding PEG4000, heating to 80-90 ℃, increasing the rotating speed to 1200-1500r/min, and stirring for 30-50min;
The temperature of the material is reduced to below 40 ℃, and the material is crushed and sieved by a 200-mesh sieve to obtain the filler.
Preferably, the dispersant is L-24, and the thermal oxidation anti-aging agent is 445.
Preferably, the cross-linking agent is dipentyl dithiocarbonate, and the auxiliary cross-linking agent is TMPTMA.
In a second aspect, the application provides a preparation method of the high-temperature-resistant EPDM rubber compound for an engine sheath, which specifically comprises the following steps in sequence:
(1) Mixing, namely adding EPDM raw rubber, magnesium oxide, a dispersing agent and a thermal oxidation antioxidant into an internal mixer, and reducing the pressure of 5-7bar by an upper bolt at the rotating speed of 40-50r/min for 70-90s;
adding filler and paraffin oil, and reducing the pressure of 5-7bar of the upper bolt at 20-40r/min until the temperature reaches 110-120 ℃;
Keeping the upper bolt at the high position for 8-15s at the rotating speed of 20-40 r/min;
Reducing the pressure of the upper bolt by 2-4bar at the rotating speed of 10-20r/min until the temperature reaches 130-140 ℃;
Adding a cross-linking agent and a crosslinking assistant agent, reducing the pressure of an upper top bolt and 2-4bar at a rotating speed of 10-20r/min for 15-30s, and opening a discharging door after the temperature is less than or equal to 140 ℃ to discharge the sizing material to a lower open mill to obtain a sizing material semi-finished product;
(2) And (3) post-treatment, namely cooling the sizing material semi-finished product through two open mills with the roller temperature less than or equal to 60 ℃, and then filtering sizing materials, discharging sizing materials, cooling and storing.
In a specific embodiment, the upper plug is lowered to a pressure of 2-4bar at a speed of 10-20r/min to a temperature of 130-140 ℃;
Adding a crosslinking agent and a crosslinking assistant agent, reducing the pressure of the upper ram by 2-4bar at the rotating speed of 10-20r/min for 15-30s, and after the temperature is less than or equal to 140 ℃ at the same time (the temperature of a reaction system can be increased in the process of maintaining the pressurizing force for a period of time, and discharging can be performed only by controlling the temperature to be not higher than 140 ℃ in the pressurizing process), opening a discharging door, and discharging the sizing material to a lower open mill to obtain a sizing material semi-finished product.
In a specific embodiment, the concrete steps of sizing material blanking, cooling and storing are that the filtered rubber compound is sequentially immersed into a cold water tank and a separant tank from a rubber filter in a multi-strip mode through a selected die with fixed width and thickness, then rubber strips enter a cooling bellows to be suspended for cooling and air drying, and after the temperature of the rubber strips is reduced to below 35 ℃, the rubber strips are stacked and packaged.
In a third aspect, the application provides the use of said high temperature EPDM elastomeric compound in an engine boot.
In summary, the technical scheme of the application has the following effects:
the rubber compound provided by the scheme solves the problem of poor adaptation of the salt bath extrusion section hole forming and the rapid extrusion fluidity of the engine sheath through the precise type selection of raw rubber varieties, the matching of the varieties of filler such as rapid extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin and PEG4000 and the matching of the crosslinking agent and the auxiliary crosslinking agent.
The rubber compound provided by the scheme is used as an engine sheath to be in a compact state as a whole, and no pore defect which can be identified by naked eyes exists.
The rubber compound provided by the scheme can meet the vulcanization extrusion speed of salt bath, can realize continuous production, improves the production efficiency, and can effectively avoid partial over-sulfur or under-sulfur by uniformly transferring heat of salt medium in the vulcanization process, improve the product quality and reduce the manufacturing cost.
The rubber compound provided by the scheme successfully realizes the deep fusion of the high-temperature-resistant advantage of the peroxide curing system and the salt bath rapid curing process, and effectively solves the double challenges of high performance and high efficiency in the industry.
Detailed Description
The present application is described in further detail below in conjunction with examples, comparative examples and performance test experiments, which should not be construed as limiting the scope of the application as claimed.
Examples
Examples 1 to 5
Examples 1-5 provide a high temperature resistant EPDM rubber compound for an engine cover and a preparation method thereof, respectively.
The difference between the above examples is that the amounts of the raw material components are different, as shown in Table 1.
The preparation method of the high temperature resistant EPDM rubber compound for the engine sheath suitable for salt bath vulcanization in the above embodiment is specifically shown as follows.
(1) Mixing
EPDM raw rubber (composed of oil-filled EPDM 10675C and low-mooney EPDM S505A in a weight ratio of 7:6) was charged into an internal mixer with magnesium oxide, dispersant L-24, and thermal-oxygen anti-aging agent 445, and the pressure of 6bar was lowered by the upper ram at a rotation speed of 45r/min, and maintained for 80S. Wherein, oil filled EPDM 10675C, low mooney EPDM S505A is provided by aroneaceae.
Filler (prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin and PEG4000 with the weight ratio of 6.5:3.5:1.5:0.2) and paraffin oil are added, and the pressure of the upper top bolt for adding 6bar is reduced to reach 110 ℃ at the rotating speed of 30 r/min. The preparation method of the filler comprises the steps of placing kaolin into an ethanol water solution of 1wt% of silane coupling agent KH-550, stirring and reacting for 3 hours at 65 ℃, then placing the mixture into a condition of 85 ℃ and drying for 5 hours to obtain silane modified kaolin, wherein the ethanol water solution is formed by mixing ethanol and water in a volume ratio of 9:1, and the pH value of the ethanol water solution is adjusted to 4.5 by acetic acid. Mixing 65g of quick-extrusion carbon black N550 and 35g of semi-reinforcing carbon black N774, adding 6g of ethanol (6% of total mass of carbon black), ball-milling for 3 hours under the conditions of a ball-material ratio of 8:1 and a rotating speed of 350r/min, drying for 4 hours under the conditions of 75 ℃, crushing and sieving with a 200-mesh sieve to obtain carbon black mixed powder, uniformly mixing 15g of silane modified kaolin and carbon black mixed powder under the conditions of 900r/min, heating to 65 ℃, adding 2g of PEG4000, heating to 85 ℃, increasing the rotating speed to 1400r/min, stirring for 40min, reducing the temperature of materials to below 40 ℃, crushing and sieving with a 200-mesh sieve to obtain the filler.
The process can volatilize water and low molecular substances in the sizing material reaching 110 ℃ at the rotating speed of 30r/min and keeping the upper bolt at the high position for 10 s.
The pressure of 3bar is reduced to 130 ℃ by the rotating speed of 15r/min, the process mainly comprises the steps of further dispersing raw rubber and various compounding agents, and the rubber compound can obtain good fluidity.
Adding a cross-linking agent dipentyl dithiocarbonate and a co-cross-linking agent TMPTMA, reducing the pressure of an upper top bolt and 3bar for 20s at the rotating speed of 15r/min, and opening a discharging door after the temperature is less than or equal to 140 ℃, and discharging the sizing material to a lower open mill to obtain a sizing material semi-finished product.
(2) Post-treatment
Cooling and filtering the raw material semi-finished product by an open mill with the roller temperature less than or equal to 60 ℃ and then filtering the raw material by a rubber filter;
And (3) unloading, cooling and storing the mixed rubber, namely sequentially immersing the filtered mixed rubber into a cold water tank and a separant tank from a rubber filter in a multi-strip mode with fixed width and thickness through a selected die. Then the adhesive tape enters a cooling bellows to be suspended for cooling and air drying, and after the temperature of the film is reduced to below 35 ℃, the film is stacked and packaged.
TABLE 1 amounts of the raw material components in examples 1-5 and comparative examples 1-2
Examples 6 to 7
Examples 6-7 provide a high temperature resistant EPDM rubber compound for an engine cover and a preparation method thereof, respectively.
The above-described embodiment differs from embodiment 1 in particular in the type of EPDM raw rubber, as shown below.
In example 6, the EPDM rubber stock was composed of a blend of oil-extended EPDM 10675C and low Mooney EPDM S505A in a weight ratio of 8:5.
In example 7, the EPDM rubber stock was composed of a blend of 5:7 weight percent oil filled EPDM 10675C, low Mooney EPDM S505A.
Other process parameters in the above examples are the same as in example 1.
Examples 8 to 10
Examples 8-10 provide a high temperature resistant EPDM rubber compound for an engine cover and a preparation method thereof, respectively.
The above embodiment differs from embodiment 1 in the specific type of filler as shown below.
In the example 8, the filler is prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin and PEG4000 in a weight ratio of 6:4:1:0.25.
In example 9, the filler was prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin, and PEG4000 in a weight ratio of 7:3:2:0.15.
In example 10, the filler was prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin, and PEG4000 in a weight ratio of 5:5:3:0.1.
Other process parameters in the above examples are the same as in example 1.
Comparative example
Comparative examples 1 to 2
Comparative examples 1-2 provide an EPDM rubber mix and a method of making the same, respectively.
The above comparative example differs from example 1 in the amounts of the components in the EPDM mix, as shown in table 1.
Other process parameters in the above comparative example were the same as in example 1.
Comparative examples 3 to 6
Comparative examples 3-6 provide an EPDM mix and a method of making the same, respectively.
The above comparative example is different from example 1 in the following.
In comparative example 3, the EPDM rubber was composed of a blend of oil-extended EPDM 10675C and low-Mooney EPDM S505A in a weight ratio of 3:7.
In comparative example 4, the filler was obtained by directly mixing fast extrusion carbon black N550, semi-reinforcing carbon black N774, kaolin (unmodified) and PEG4000 in a weight ratio of 6.5:3.5:1.5:0.2.
In comparative example 5, the filler was prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin, and PEG2000 in a weight ratio of 6.5:3.5:1.5:0.2.
In comparative example 6, the filler was prepared from fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin, and PEG4000 in a weight ratio of 3.5:6.5:4:0.5.
Other process parameters in the above comparative example were the same as in example 1.
Performance test
(1) Suitability of salt bath vulcanization process
(1.1) Viscosity according to the test method of GB/T1232.1-2016, the viscosity of the rubber compound sample prepared in the example or the comparative example is detected by keeping the temperature of the rubber compound sample at a fixed temperature of 100 ℃ (the temperature before extrusion of the extruded salt bath vulcanized rubber compound) at a rotating speed of 2r/min for 4 min.
(1.2) Appearance article the rubber compound samples prepared in the examples or comparative examples were extruded at an extrusion speed of 30m/min by using a phi 30mm single screw extruder (head temperature 65 ℃ C., screw speed 45 r/min), and the surface of the extruded article was observed for defects such as scratches and bubbles.
(2) Tensile Strength the tensile strength of the test pieces of the compounds prepared in the examples or comparative examples was measured according to the specification of GB/T528.
(3) High temperature resistance the rubber compound samples prepared in the examples or the comparative examples are put into an aging test box, are taken out after being stood for 168 hours at 150 ℃, are naturally cooled to room temperature, and then the tensile strength is measured again, and the tensile strength retention rate is calculated. Tensile strength retention = (tensile strength of test piece after high temperature test/tensile strength of original test piece) ×100%.
The results are shown in Table 2.
Table 2 results of the test of the properties of the compounds of examples and comparative examples
From the detection results in the table 2, it is apparent that the viscosity of the prepared mixed rubber material at 100 ℃ is 42.7-49.8 MPa.s, the fluidity is good, the extrusion processability is excellent, the surface of the rubber material product treated by the salt bath vulcanization process has no defects such as scratches and bubbles, and the retention rate of the tensile strength of the mixed rubber material after 150 ℃ multiplied by 168 hours aging is not less than 81%. The test performance results show that the method provided by the application can effectively balance the extrusion processability and the high temperature resistance of the sizing material through accurate cooperation of the types and the amounts of the raw material components, and is suitable for salt bath vulcanized rubber products.
From the results of comparative examples 1 to 5 and comparative examples 1 to 2, it is understood that the amounts of the respective raw material components have a large influence on the properties of the mixed glue. In comparative examples 1-2, the prepared rubber compound sample material was poor in performance, poor in fluidity, unsuitable for salt bath vulcanization, and poor in high temperature resistance. In contrast, the extrusion processability and the high temperature resistance of the prepared mixed glue finished product are excellent by accurately adjusting the dosage of each raw material component.
From the results of comparative examples 1, 6 to 7 and comparative example 3, it is understood that the kind of EPDM raw rubber has a large influence on the performance of the mixed rubber product. The EPDM rubber in comparative example 3 is prepared by mixing oil-filled EPDM 10675C and low-Mooney EPDM S505A in a weight ratio of 3:7, and the prepared rubber compound sample material has poor high temperature resistance. In contrast, the EPDM raw rubber is formed by mixing the oil-filled EPDM 10675C and the low-Mooney EPDM S505A in a weight ratio of 5-8:5-7, and the prepared mixed rubber finished product has excellent extrusion processability and high temperature resistance.
From the results of comparative examples 1,8 to 10 and comparative examples 4 to 6, it is understood that the kind of filler has a large influence on the properties of the mixed rubber product. The filler in the comparative example 4 is obtained by directly mixing fast extrusion carbon black N550, semi-reinforcing carbon black N774, unmodified kaolin and PEG4000 in a weight ratio of 6.5:3.5:1.5:0.2, the filler in the comparative example 5 is prepared by fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin and PEG2000 in a weight ratio of 6.5:3.5:1.5:0.2, and the filler in the comparative example 6 is prepared by fast extrusion carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin and PEG4000 in a weight ratio of 3.5:6.5:4:0.5, so that the extrusion processability and the high temperature resistance of the prepared rubber compound sample material are poor. In contrast, the filler is prepared by rapidly extruding carbon black N550, semi-reinforcing carbon black N774, silane modified kaolin and PEG4000, and the prepared mixed glue finished product has excellent extrusion processability and high temperature resistance.
While the invention has been described in detail in the foregoing general description and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Accordingly, such modifications or improvements may be made without departing from the spirit of the invention and are intended to be within the scope of the invention as claimed.
Claims (10)
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