EPDM (Ethylene-Propylene-Diene Monomer) rubber material for high / low-temperature-resistant cooling-liquid-

Abstract

The invention discloses an EPDM (Ethylene-Propylene-Diene Monomer) sizing material for a high / low-temperature-resistant cooling-liquid-resistant colored sealing product and a preparation method of the EPDM sizing material, and belongs to the technical field of EPDM sizing materials, the EPDM sizing material comprises the following components in parts by mass: 100 parts of EPDM rubber, 20-60 parts of modified white carbon black, 5-25 parts of calcined kaolin, 5-15 parts of paraffin oil, 0-5 parts of a white smoke activator, 0-5 parts of a silane coupling agent, 0-1.5 parts of stearic acid and 3-8 parts of zinc oxide. The composition comprises the following components in parts by weight: 0-3 parts of an active agent, 0-3 parts of an anti-aging agent, 0-3 parts of a lubricating agent, 0-3 parts of low molecular weight polyethylene wax, 0-2 parts of a processing aid, 5-10 parts of TiO2 and colored glue, and 7-11 parts of a vulcanizing agent and a vulcanization accelerator. Through the mode, the EPDM rubber material prepared by the invention is better in stability, has the characteristics of high physical and mechanical properties, high-temperature aging resistance, low-temperature resistance, cooling liquid resistance and the like, and meets the use requirements of high and low temperature-resistant cooling liquid-resistant colored sealing products.

Description

Technical Field

[0001] The invention relates to the technical field of EPDM rubber compounds, in particular to an EPDM rubber compound for high- and low-temperature-resistant and coolant-resistant colored sealing products and a preparation method thereof. Background Art

[0002] With the development of the automotive industry and rising environmental awareness, China is placing increasingly high demands on the quality of automotive products. To improve fuel efficiency, modern automobile engines are designed to operate at higher temperatures, with the upper limit of normal operating temperatures generally exceeding 100°C. Since 60% of the engine's heat must be dissipated to the surrounding environment through the cooling system, a lack of antifreeze prevents effective engine cooling, causing the water temperature to rise, leading to engine overheating, reduced power, and even, in severe cases, engine burnout. Therefore, the engine cooling system is extremely critical. However, coolant leakage caused by cracked seals in automobile engine cooling systems is a common problem. Therefore, the performance and service life of seals are of paramount importance.

[0003] In order to continuously meet customer requirements, it is of great significance to design and develop rubber compounds for color sealing products that have stable performance, resistance to high and low temperatures, resistance to coolants, high physical and mechanical properties, and excellent process performance.

[0004] Based on this, the present invention designs an EPDM rubber material for high and low temperature resistant and coolant resistant colored sealing products and a preparation method thereof to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products and a preparation method thereof.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products has the following components in parts by mass: EPDM rubber: 100 parts, modified white carbon black: 20-60 parts, calcined kaolin: 5-25 parts, paraffin oil: 5-15 parts, white smoke activator: 0-5 parts, silane coupling agent: 0-5 parts, stearic acid: 0-1.5 parts, zinc oxide: 3-8 parts, activator: 0-3 parts, antioxidant: 0-3 parts, lubricant: 0-3 parts, low molecular weight polyethylene wax: 0-3 parts, processing aid: 0-2 parts, TiO2 and colored glue in total 5-10 parts, vulcanizing agent and vulcanization accelerator in total 7-11 parts.

[0008] Furthermore, the EPDM rubber adopts Mitsui EP4045M, or Mitsui EP4045M and Lanxess EP5470C; the paraffin oil adopts paraffin oil T16 or paraffin oil mp100h.

[0009] Furthermore, the calcined kaolin is 800 mesh ultrafine calcined kaolin, the white smoke active agent is diethylene glycol, the silane coupling agent model is HP669, the active agent is polyethylene glycol 4000, the antioxidant model is 445, the lubricant is Haftolat / P, the low molecular weight polyethylene wax model is AC617, and the processing aid model is AKTiPLAST T.

[0010] Furthermore, the vulcanization accelerators used are 14-40BD-PD and TAIC-70.

[0011] Furthermore, the components are as follows in parts by mass: 100 parts of EPDM Mitsui EP4045M, 30 parts of modified white carbon black, 15 parts of 800 mesh ultrafine calcined kaolin, 5 parts of paraffin oil T16, 1.5 parts of white smoke activator diethylene glycol, 2 parts of silane coupling agent HP669, 0.5 parts of stearic acid, 5 parts of zinc oxide, 1.5 parts of activator polyethylene glycol 4000, 1.5 parts of antioxidant 445, 1 part of lubricant Haftolat / P, 1 part of low molecular weight polyethylene wax AC617, 1 part of processing aid AKTiPLAST T, 8.726 parts of TiO2 and color glue in total, and 8 parts of vulcanizing agent and vulcanization accelerator 14-40BD-PD and TAIC-70 in total.

[0012] Furthermore, the components are as follows in parts by mass: Mitsui EP4045M: 80 parts, Lanxess EP5470C: 20 parts, modified white carbon black: 30 parts, 800 mesh ultrafine calcined kaolin: 15 parts, paraffin oil T16: 5 parts, white smoke activator diethylene glycol: 1.5 parts, silane coupling agent HP669: 2 parts, stearic acid: 0.5 parts, zinc oxide: 5 parts, activator polyethylene glycol 4000: 1.5 parts, antioxidant 445: 1 part, lubricant Haftolat / P: 1 part, low molecular weight polyethylene wax AC617: 1 part, processing aid AKTiPLAST T: 1 part, TiO2 and color pigment totaling 8.726 parts, vulcanizing agent and vulcanization accelerator 14-40BD-PD and TAIC-70 totaling 8 parts.

[0013] Furthermore, the components are as follows in parts by mass: Mitsui EPDM rubber EP4045M: 80 parts, Lanxess EPDM rubber EP5470C: 20 parts, modified white carbon black: 30 parts, 800 mesh ultrafine calcined kaolin: 15 parts, paraffin oil MP100H: 5 parts, white smoke activator diethylene glycol: 1.5 parts, silane coupling agent HP669: 2 parts, stearic acid: 0.5 parts, zinc oxide: 5 parts, activator polyethylene glycol 4000: 1.5 parts, antioxidant 445: 1 part, lubricant Haftolat / P: 1 part, low molecular weight polyethylene wax AC617: 1 part, processing aid AKTiPLAST T: 1 part, TiO2 and color pigment totaling 8.726 parts, vulcanizing agent and vulcanization accelerator 14-40BD-PD and TAIC-70 totaling 8 parts.

[0014] Furthermore, the preparation method of the modified silica is as follows: adding silica ZC185 to water to prepare a silica dispersion; placing the silica dispersion in an irradiation device, first performing weak irradiation treatment with an electron beam, and then performing strong irradiation treatment; the parameters of the weak irradiation treatment are controlled as follows: acceleration voltage: 55-85kV; electron beam current: 20-30mA; irradiation dose: 58-83kGy; irradiation time: 5-10min; the parameters of the strong irradiation treatment are controlled as follows: acceleration voltage: 100-115kV; electron beam current: 32-40mA; irradiation dose: 108-113kGy; irradiation time: 10-20s; adding silane coupling agent HP669 to the silica dispersion after irradiation treatment, the amount of silane coupling agent HP669 is 0.1-1% of the mass of the silica dispersion, stirring for 2-3h, and freeze-drying to obtain modified silica.

[0015] In order to better achieve the purpose of the present invention, the present invention also provides a method for preparing an EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products, comprising the following steps:

[0016] Step (1), first mixing: put EPDM rubber, stearic acid, zinc oxide, TiO2, color glue, modified white carbon black, white smoke active agent and silane coupling agent into an internal mixer, and mix at 84-90°C for 50-70s; then put processing aid, calcined kaolin and active agent into the internal mixer, and continue to heat at a heating rate of 5-10°C / min while mixing. When the mixing temperature reaches 105-115°C, continue to add paraffin oil, antioxidant, lubricant and low molecular weight polyethylene wax, mix for 50-60s, and then clean the top bolt; then continue to heat to 150-152°C at a heating rate of 10-15°C / min, keep it for 50-70s, unload and flake to obtain mixed rubber A for standby use;

[0017] Step (2), second mixing: mix the rubber mix A that has been parked for more than 7-8 hours with the vulcanizer and the vulcanization accelerator, mix at 100-101°C for 45-50s, clean it and mix it again at 100-101°C for 45-50s, then cut the material into sheets to obtain EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products.

[0018] In order to better achieve the purpose of the present invention, the present invention also provides an EPDM rubber material for high- and low-temperature resistant and coolant-resistant colored sealing products obtained according to the preparation method.

[0019] Compared with the prior art, the present invention has the following beneficial effects: the present invention selects Mitsui EPDM rubber EP4045M as the main material of the rubber compound, which has low Mooney and good fluidity, low ethylene content, good low temperature performance, high third monomer content and fast vulcanization speed, and uses Lanxess EPDM rubber EP5470C with medium Mooney and high ethylene content to improve strength, and modified white carbon black (white carbon black modified by irradiation and silane coupling agent) is beneficial to enhance the bonding force with EPDM rubber compound, improve the crosslinking density of the rubber compound and the stability of the network structure, and is not easy to produce irreversible deformation, which helps The invention also uses a white smoke activator, diethylene glycol (DEG), and a silane coupling agent, HP669, to effectively react with the silanol groups on the surface of modified silica to further enhance the physical properties and processing requirements of the rubber. The addition of paraffin oil and ultrafine calcined kaolin ensures that the physical properties of the rubber compound are not reduced, while ensuring excellent aging resistance and coolant resistance, further reducing costs and improving the processability of the rubber. The use of a peroxide curing agent (DTBP) ensures the high-temperature resistance of the rubber product and effectively extends its service life. The EPDM rubber compound prepared by the present invention has better stability, high physical and mechanical properties, high-temperature aging resistance, low-temperature resistance, and coolant resistance, meeting the requirements for use in high- and low-temperature resistant and coolant-resistant colored sealing products. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example 1: The preparation method of EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products is as follows:

[0022] (1) Ingredients: Weigh the following raw materials by mass: 100 parts of EPDM Mitsui EP4045M, 30 parts of modified white carbon black, 15 parts of 800 mesh ultrafine calcined kaolin, 5 parts of paraffin oil T16, 1.5 parts of white smoke active agent diethylene glycol (DEG), 2 parts of silane coupling agent HP669, 0.5 parts of stearic acid (SA), 5 parts of zinc oxide, 1.5 parts of active agent polyethylene glycol (PEG) 4000, 1.5 parts of antioxidant 445, 1 part of lubricant Haftolat / P, 1 part of low molecular weight polyethylene wax AC617, and AKTiPLAST processing aid. T: 1 part, TiO2 and color glue (mass ratio 3:1) totaling 8.726 parts, vulcanizing agent (DTBP), vulcanization accelerator 14-40BD-PD and vulcanization accelerator TAIC-70 (mass ratio 6:1:1) totaling 8 parts.

[0023] The modified silica preparation method comprises the following steps: adding silica ZC185 into water to prepare a silica dispersion; placing the silica dispersion in an irradiation device, first performing weak irradiation treatment with an electron beam, and then performing strong irradiation treatment; the parameters of the weak irradiation treatment are controlled as follows: acceleration voltage: 55 kV; electron beam current: 30 mA; irradiation dose: 58 kGy; irradiation time: 10 minutes; the parameters of the strong irradiation treatment are controlled as follows: acceleration voltage: 100 kV; electron beam current: 40 mA; irradiation dose: 108 kGy; irradiation time: 20 seconds; adding a silane coupling agent HP669 to the irradiated silica dispersion in an amount of 0.1% by mass of the silica dispersion, stirring for 3 hours, and freeze-drying to obtain the modified silica.

[0024] (2) First mixing: put EPDM rubber, stearic acid, zinc oxide, TiO2, color glue, modified white carbon black, white smoke active agent and silane coupling agent into an internal mixer and mix at 90℃ for 60s; then put processing aid, calcined kaolin and active agent into the internal mixer and continue to heat up at a heating rate of 6℃ / min while mixing. When the mixing temperature reaches 110℃, continue to add paraffin oil, antioxidant, lubricant and low molecular weight polyethylene wax and mix for 60s, then clean the top bolt; then continue to heat up to 152℃ at a heating rate of 11℃ / min, keep it for 60s, unload and flake to obtain mixed rubber A for standby use;

[0025] (3) Second mixing: Mix the rubber mix A that has been stored for more than 8 hours with the vulcanizer and vulcanization accelerator, mix at 100°C for 50 seconds, clean it and mix at 100°C for 50 seconds again, then cut the material into sheets to obtain EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products.

[0026] Example 2: The preparation method of EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products is as follows:

[0027] (1) Ingredients: Weigh the following raw materials by mass: Mitsui EP4045M: 80 parts, Lanxess EP5470C: 20 parts, modified silica: 30 parts, 800 mesh ultrafine calcined kaolin: 15 parts, paraffin oil T16: 5 parts, white smoke active agent diethylene glycol (DEG): 1.5 parts, silane coupling agent HP669: 2 parts, stearic acid (SA): 0.5 parts, zinc oxide: 5 parts, active agent polyethylene glycol (PEG) 4000: 1.5 parts, antioxidant 445: 1 part, lubricant Haftolat / P: 1 part, low molecular weight polyethylene wax AC617: 1 part, processing aid AKTiPLAST T: 1 part, TiO2 and color glue (mass ratio 3:1) totaling 8.726 parts, vulcanizing agent (DTBP), vulcanization accelerator 14-40BD-PD and vulcanization accelerator TAIC-70 (mass ratio 6:1:1) totaling 8 parts.

[0028] The modified silica preparation method comprises the following steps: adding silica ZC185 into water to prepare a silica dispersion; placing the silica dispersion in an irradiation device, first performing weak irradiation treatment with an electron beam, and then performing strong irradiation treatment; the parameters of the weak irradiation treatment are controlled as follows: acceleration voltage: 85 kV; electron beam current: 20 mA; irradiation dose: 83 kGy; irradiation time: 5 min; the parameters of the strong irradiation treatment are controlled as follows: acceleration voltage: 115 kV; electron beam current: 32 mA; irradiation dose: 113 kGy; irradiation time: 10 s; adding a silane coupling agent HP669 to the irradiated silica dispersion in an amount of 1% by mass of the silica dispersion, stirring for 2 h, and then freeze-drying to obtain the modified silica.

[0029] (2) First mixing: put EPDM rubber, stearic acid, zinc oxide, TiO2, color glue, modified white carbon black, white smoke active agent and silane coupling agent into an internal mixer and mix at 84℃ for 60s; then put processing aid, calcined kaolin and active agent into the internal mixer and continue to heat up at a heating rate of 6℃ / min while mixing. When the mixing temperature reaches 110℃, continue to add paraffin oil, antioxidant, lubricant and low molecular weight polyethylene wax and mix for 60s, then clean the top bolt; then continue to heat up to 150℃ at a heating rate of 11℃ / min, keep it for 60s, unload and flake to obtain rubber mix A for standby use;

[0030] (3) Second mixing: Mix the rubber mix A that has been stored for more than 8 hours with the vulcanizer and vulcanization accelerator, mix at 101°C for 45 seconds, clean it and mix at 101°C for another 45 seconds, then cut the material into sheets to obtain EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products.

[0031] Example 3: The preparation method of EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products is as follows:

[0032] (1) Ingredients: Weigh the following raw materials by mass: Mitsui EP4045M: 80 parts, Lanxess EP5470C: 20 parts, modified white carbon black: 30 parts, 800 mesh ultrafine calcined kaolin: 15 parts, paraffin oil MP100H: 5 parts, white smoke active agent diethylene glycol (DEG): 1.5 parts, silane coupling agent HP669: 2 parts, stearic acid (SA): 0.5 parts, zinc oxide: 5 parts, active agent polyethylene glycol (PEG) 4000: 1.5 parts, antioxidant 445: 1 part, lubricant Haftolat / P: 1 part, low molecular weight polyethylene wax AC617: 1 part, processing aid AKTiPLAST T: 1 part, TiO2 and color glue (mass ratio 3:1) totaling 8.726 parts, vulcanizing agent (DTBP), vulcanization accelerator 14-40BD-PD and vulcanization accelerator TAIC-70 (mass ratio 6:1:1) totaling 8 parts.

[0033] The modified silica preparation method comprises the following steps: adding silica ZC185 into water to prepare a silica dispersion; placing the silica dispersion in an irradiation device, first performing weak irradiation treatment with an electron beam, and then performing strong irradiation treatment; the parameters of the weak irradiation treatment are controlled as follows: acceleration voltage: 65 kV; electron beam current: 25 mA; irradiation dose: 70 kGy; irradiation time: 8 minutes; the parameters of the strong irradiation treatment are controlled as follows: acceleration voltage: 105 kV; electron beam current: 36 mA; irradiation dose: 110 kGy; irradiation time: 15 seconds; adding a silane coupling agent HP669 to the irradiated silica dispersion in an amount of 0.5% of the mass of the silica dispersion, stirring for 2.5 hours, and freeze-drying to obtain the modified silica.

[0034] (2) First mixing: put EPDM rubber, stearic acid, zinc oxide, TiO2, color glue, modified white carbon black, white smoke active agent and silane coupling agent into an internal mixer and mix at 86℃ for 60s; then put processing aid, calcined kaolin and active agent into the internal mixer and continue to heat up at a heating rate of 6℃ / min while mixing. When the mixing temperature reaches 110℃, continue to add paraffin oil, antioxidant, lubricant and low molecular weight polyethylene wax and mix for 60s, then clean the top bolt; then continue to heat up to 151℃ at a heating rate of 11℃ / min, keep it for 60s, unload and flake to obtain rubber mix A for standby use;

[0035] (3) Second mixing: Mix the rubber mix A that has been stored for more than 8 hours with the vulcanizer and vulcanization accelerator, mix at 101°C for 47 seconds, clean it and mix at 101°C for another 47 seconds, then cut the material into sheets to obtain EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products.

[0036] Example 4: The preparation method of EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products is as follows:

[0037] (1) Ingredients: Weigh the following raw materials by mass: Mitsui EP4045M: 80 parts, Lanxess EP5470C: 20 parts, modified white carbon black: 20 parts, 800 mesh ultrafine calcined kaolin: 25 parts, paraffin oil MP100H: 5 parts, white smoke active agent diethylene glycol (DEG): 5 parts, silane coupling agent HP669: 0 parts, stearic acid (SA): 1.5 parts, zinc oxide: 3 parts, active agent polyethylene glycol (PEG) 4000: 3 parts, antioxidant 445: 0 parts, lubricant Haftolat / P: 3 parts, low molecular weight polyethylene wax AC617: 0 parts, processing aid AKTiPLAST T: 2 parts, TiO2 and color glue (mass ratio 3:1) total 5 parts, vulcanizing agent (DTBP), vulcanization accelerator 14-40BD-PD and vulcanization accelerator TAIC-70 (mass ratio 6:1:1) total 11 parts.

[0038] (2) First mixing: put EPDM rubber, stearic acid, zinc oxide, TiO2, color glue, modified white carbon black, white smoke active agent and silane coupling agent into an internal mixer and mix at 84℃ for 70s; then put processing aid, calcined kaolin and active agent into the internal mixer and continue to heat up at a heating rate of 5℃ / min while mixing. When the mixing temperature reaches 115℃, continue to add paraffin oil, antioxidant, lubricant and low molecular weight polyethylene wax and mix for 50s, then clean the top bolt; then continue to heat up to 150℃ at a heating rate of 15℃ / min, keep it for 70s, unload and flake to obtain rubber mix A for standby use;

[0039] (3) Second mixing: Mix the rubber mix A that has been stored for more than 7 hours with the vulcanizer and vulcanization accelerator, mix at 101°C for 45 seconds, clean it and mix at 101°C for another 45 seconds, then cut the material into sheets to obtain EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products.

[0040] Example 5: The preparation method of EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products is as follows:

[0041] (1) Ingredients: Weigh the following raw materials by mass: Mitsui EP4045M: 80 parts, Lanxess EP5470C: 20 parts, modified white carbon black: 60 parts, 800 mesh ultrafine calcined kaolin: 5 parts, paraffin oil MP100H: 15 parts, white smoke active agent diethylene glycol (DEG): 0 parts, silane coupling agent HP669: 5 parts, stearic acid (SA): 0 parts, zinc oxide: 8 parts, active agent polyethylene glycol (PEG) 4000: 0 parts, antioxidant 445: 3 parts, lubricant Haftolat / P: 0 parts, low molecular weight polyethylene wax AC617: 3 parts, processing aid AKTiPLAST T: 0 parts, TiO2 and color glue (mass ratio 3:1) total 10 parts, vulcanizing agent (DTBP), vulcanization accelerator 14-40BD-PD and vulcanization accelerator TAIC-70 (mass ratio 6:1:1) total 7 parts.

[0042] (2) First mixing: put EPDM rubber, stearic acid, zinc oxide, TiO2, color glue, modified white carbon black, white smoke active agent and silane coupling agent into an internal mixer and mix at 90℃ for 50s; then put processing aid, calcined kaolin and active agent into the internal mixer and continue to heat up at a heating rate of 10℃ / min while mixing. When the mixing temperature reaches 105℃, continue to add paraffin oil, antioxidant, lubricant and low molecular weight polyethylene wax and mix for 60s, then clean the top bolt; then continue to heat up to 152℃ at a heating rate of 10℃ / min, keep it for 50s, unload and flake to obtain rubber mix A for standby use;

[0043] (3) Second mixing: Mix the rubber mix A that has been stored for more than 8 hours with the vulcanizer and vulcanization accelerator, mix at 100°C for 50 seconds, clean it and mix at 100°C for 50 seconds again, then cut the material into sheets to obtain EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products.

[0044] Comparative Example 1: The difference from Example 5 is that the modified silica is replaced by silica.

[0045] Experimental Example: The performance of the high-low temperature resistant and coolant resistant colored sealing products prepared in Examples 1-5 and Comparative Example 1 was tested using EPDM rubber. The results are shown in Table 1-2.

[0046] Table 1

[0047]

[0048]

[0049] Table 2

[0050]

[0051] As can be seen from Table 1, compared with Example 1, Example 2 of the present invention uses 20 parts of EP5470C to replace EP4045M, which not only significantly improves the strength of the EPDM rubber, but also correspondingly improves the aging and coolant resistance. Compared with Example 2, Example 3 uses environmentally friendly MP100H to replace the high-viscosity T16, which improves the stability of the EPDM rubber, and further improves the compression set, aging and coolant resistance. The low Mooney value facilitates processing.

[0052] As can be seen from Table 2, compared with Comparative Example 1, Example 5 of the present invention has a significant effect on the tensile strength, elongation at break, aging, compression set, aging, coolant resistance and low-temperature brittleness of the EPDM rubber after replacing the modified silica with silica.

[0053] The principle of the present invention is: Mitsui EPDM rubber EP4045M is selected as the main material of the rubber compound, which has low Mooney and good fluidity, low ethylene content, good low temperature performance, high third monomer content and fast vulcanization speed, and is matched with Lanxess EPDM rubber EP5470C with medium Mooney and high ethylene content to improve strength, and modified white carbon black (white carbon black modified by irradiation and silane coupling agent) is beneficial to enhance the bonding force with EPDM rubber compound, improve the crosslinking density of the rubber compound and the stability of the network structure, is not easy to produce irreversible deformation, and helps to resist low temperature The EPDM rubber compound prepared by the present invention has better stability, high physical and mechanical properties, high temperature aging resistance, low temperature resistance, and coolant resistance, and meets the requirements of high-temperature, low-temperature, and coolant-resistant colored sealing products.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products, characterized by: The components in parts by mass are as follows: EPDM rubber: 100 parts, modified white carbon black: 20-60 parts, calcined kaolin: 5-25 parts, paraffin oil: 5-15 parts, white smoke activator: 0-5 parts, silane coupling agent: 0-5 parts, stearic acid: 0-1.5 parts, zinc oxide: 3-8 parts, activator: 0-3 parts, antioxidant: 0-3 parts, lubricant: 0-3 parts, low molecular weight polyethylene wax: 0-3 parts, processing aid: 0-2 parts, TiO2 and color glue in total 5-10 parts, vulcanizing agent and vulcanization accelerator in total 7-11 parts.

2. The EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products according to claim 1, characterized in that: The EPDM rubber used is Mitsui EP4045M, or Mitsui EP4045M and Lanxess EP5470C; the paraffin oil used is paraffin oil T16 or paraffin oil mp100h.

3. The EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products according to claim 1, characterized in that: The calcined kaolin is 800 mesh ultrafine calcined kaolin, the white smoke active agent is diethylene glycol, the silane coupling agent model is HP669, the active agent is polyethylene glycol 4000, the antioxidant model is 445, the lubricant is Haftolat / P, the low molecular weight polyethylene wax model is AC617, and the processing aid model is AKTiPLAST T.

4. The EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products according to claim 1, characterized in that: The vulcanization accelerators used were 14-40BD-PD and TAIC-70.

5. The EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products according to claim 1, characterized in that: The components are as follows by mass: 100 parts of EPDM Mitsui EP4045M, 30 parts of modified white carbon black, 15 parts of 800 mesh ultrafine calcined kaolin, 5 parts of paraffin oil T16, 1.5 parts of white smoke active agent diethylene glycol, 2 parts of silane coupling agent HP669, 0.5 parts of stearic acid, 5 parts of zinc oxide, and 5 parts of active agent polyethylene glycol 4000. 1.5 parts, antioxidant 445: 1 part, lubricant Haftolat / P: 1 part, low molecular weight polyethylene wax AC617: 1 part, processing aid AKTiPLAST T: 1 part, TiO2 and color glue total 8.726 parts, vulcanizing agent and vulcanization accelerator 14-40BD-PD and TAIC-70 total 8 parts.

6. The EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products according to claim 3, characterized in that: The components are as follows by mass: Mitsui EPDM rubber EP4045M: 80 parts, Lanxess EPDM rubber EP5470C: 20 parts, modified white carbon black: 30 parts, 800 mesh ultrafine calcined kaolin: 15 parts, paraffin oil T16: 5 parts, white smoke active agent diethylene glycol: 1.5 parts, silane coupling agent HP669: 2 parts, stearic acid: 0.5 parts, zinc oxide: 5 parts, active agent polyethylene glycol 4000: 1.5 parts, antioxidant 445: 1 part, lubricant Haftolat / P: 1 part, low molecular weight polyethylene wax AC617: 1 part, processing aid AKTiPLASTT: 1 part, TiO2 and color glue total 8.726 parts, vulcanizing agent and vulcanization accelerator 14-40BD-PD and TAIC-70 total 8 parts.

7. The EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products according to claim 4, characterized in that: The components are as follows by mass: Mitsui EPDM rubber EP4045M: 80 parts, Lanxess EPDM rubber EP5470C: 20 parts, modified white carbon black: 30 parts, 800 mesh ultrafine calcined kaolin: 15 parts, paraffin oil MP100H: 5 parts, white smoke active agent diethylene glycol: 1.5 parts, silane coupling agent HP669: 2 parts, stearic acid: 0.5 parts, zinc oxide: 5 parts, active agent polyethylene glycol 4000: 1.5 parts, antioxidant 445: 1 part, lubricant Haftolat / P: 1 part, low molecular weight polyethylene wax AC617: 1 part, processing aid AKTiPLAST T: 1 part, TiO2 and color glue total 8.726 parts, vulcanizing agent and vulcanization accelerator 14-40BD-PD and TAIC-70 total 8 parts.

8. The EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products according to claim 4, characterized in that: The modified silica preparation method comprises the following steps: adding silica ZC185 into water to prepare a silica dispersion; placing the silica dispersion in an irradiation device, first performing weak irradiation treatment with an electron beam, and then performing strong irradiation treatment; the weak irradiation treatment parameters are controlled as follows: acceleration voltage: 55-85 kV; electron beam current: 20-30 mA; irradiation dose: 58-83 kGy; irradiation time: 5-10 minutes; the strong irradiation treatment parameters are controlled as follows: acceleration voltage: 100-115 kV; electron beam current: 32-40 mA; irradiation dose: 108-113 kGy; irradiation time: 10-20 seconds; adding a silane coupling agent HP669 to the irradiated silica dispersion in an amount of 0.1-1% by mass of the silica dispersion, stirring for 2-3 hours, and freeze-drying to obtain the modified silica.

9. A method for preparing the EPDM rubber compound for high and low temperature resistant and coolant resistant colored sealing products according to claim 8, characterized in that: The following steps are involved: Step (1), first mixing: put EPDM rubber, stearic acid, zinc oxide, TiO2, color glue, modified white carbon black, white smoke active agent and silane coupling agent into an internal mixer, and mix at 84-90°C for 50-70s; then put processing aid, calcined kaolin and active agent into the internal mixer, and continue to heat at a heating rate of 5-10°C / min while mixing. When the mixing temperature reaches 105-115°C, continue to add paraffin oil, antioxidant, lubricant and low molecular weight polyethylene wax, mix for 50-60s, and then clean the top bolt; then continue to heat to 150-152°C at a heating rate of 10-15°C / min, keep it for 50-70s, unload and flake to obtain mixed rubber A for standby use; Step (2), second mixing: mix the rubber mix A that has been parked for more than 7-8 hours with the vulcanizer and the vulcanization accelerator, mix at 100-101°C for 45-50s, clean it and mix it again at 100-101°C for 45-50s, then cut the material into sheets to obtain EPDM rubber for high and low temperature resistant and coolant resistant colored sealing products.

10. An EPDM rubber compound for high- and low-temperature resistant and coolant-resistant colored sealing products obtained by the preparation method according to claim 9.

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