CN112679866A - Low-temperature-resistant sponge rubber sealing strip and production process thereof - Google Patents
Low-temperature-resistant sponge rubber sealing strip and production process thereof Download PDFInfo
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- CN112679866A CN112679866A CN202011496238.XA CN202011496238A CN112679866A CN 112679866 A CN112679866 A CN 112679866A CN 202011496238 A CN202011496238 A CN 202011496238A CN 112679866 A CN112679866 A CN 112679866A
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Abstract
The invention discloses a low-temperature-resistant sponge rubber sealing strip which comprises the following raw materials in parts by weight: 80-100 parts of low-ethylene EPDM raw rubber, 120-140 parts of semi-reinforcing carbon black, 80-100 parts of paraffin oil, 20-30 parts of white filler, 3.0-5.0 parts of active zinc oxide, 1.5-2 parts of stearic acid, 0.6-0.8 part of sulfur, 0.5-0.8 part of sulfur-containing accelerator, 3-5 parts of accelerator, 2-2.5 parts of foaming agent and 5-8 parts of moisture absorbent; the invention also comprises a production process of the low-temperature-resistant sponge rubber sealing strip. The invention belongs to the technical field of sponge rubber sealing strips, and particularly relates to a low-temperature-resistant sponge rubber sealing strip and a production process thereof, wherein a low-ethylene-content ethylene propylene diene monomer, high-flash-point paraffin oil and low-sulfur high-acceleration peroxide vulcanization system is adopted to greatly reduce the change of hardness of a product at low temperature and solve the problems of difficult lifting of a sliding groove rubber and large door closing force of a sponge strip.
Description
Technical Field
The invention belongs to the technical field of sponge rubber sealing strips, and particularly relates to a low-temperature-resistant sponge rubber sealing strip and a production process thereof.
Background
The automobile door sealing strip mainly plays roles in sealing, dust prevention, water prevention, decoration and the like, and is installed on a metal plate around an automobile door. Under the closed state of car door, realize sealed effect through the laminating between sealing strip and the door frame to this can prevent that outside harmful substance such as wind, rain and dust from invading in the car, and the vibration that the reducible car produced at positions such as in-process door and window of driving, with the clean nature and travelling comfort and exquisite perception in keeping the car. Meanwhile, the arrangement of the sealing strip can also improve the working environment of the door part device, prolong the service life of the door part working component, but the elasticity of the existing sealing rubber strip is lost in a low-temperature environment, and the problems of difficult lifting and large door closing force of the automobile glass chute occur.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a low-temperature-resistant sponge rubber sealing strip, and aims to solve the problems that the elasticity of a product is lost in a low-temperature environment, a glass chute is difficult to lift, and the door closing force of the sponge rubber sealing strip is large.
The technical scheme adopted by the invention is as follows: a low-temperature-resistant sponge rubber sealing strip comprises the following raw materials in parts by weight: 80-100 parts of low-ethylene EPDM raw rubber, 120-140 parts of semi-reinforcing carbon black, 80-100 parts of paraffin oil, 20-30 parts of white filler, 3.0-5.0 parts of active zinc oxide, 1.5-2 parts of stearic acid, 0.6-0.8 part of sulfur, 0.5-0.8 part of sulfur-containing accelerator, 3-5 parts of accelerator, 2-2.5 parts of foaming agent and 5-8 parts of moisture absorbent.
The low-temperature-resistant sponge rubber sealing strip disclosed by the invention is prepared from the following preferred raw materials in parts by weight: the material comprises the following raw materials in parts by weight: 85-95 parts of low-ethylene EPDM raw rubber, 125-135 parts of semi-reinforcing carbon black, 85-95 parts of paraffin oil, 22-28 parts of white filler, 3.5-4.5 parts of active zinc oxide, 1.6-1.9 parts of stearic acid, 0.65-0.75 part of sulfur, 0.6-0.7 part of sulfur-containing accelerator, 3.4-4.5 parts of accelerator, 2.1-2.4 parts of foaming agent and 6-7 parts of moisture absorbent.
The optimal weight ratio of the raw materials of the low-temperature-resistant sponge rubber sealing strip is as follows: the material comprises the following raw materials in parts by weight: 90 parts of low-ethylene EPDM raw rubber, 130 parts of semi-reinforcing carbon black, 90 parts of paraffin oil, 25 parts of white filler, 4 parts of active zinc oxide, 1.7 parts of stearic acid, 0.7 part of sulfur-containing accelerator, 4 parts of accelerator, 2.3 parts of foaming agent and 7 parts of moisture absorbent.
The invention also comprises a production process of the low-temperature-resistant sponge rubber sealing strip, which comprises the following steps:
(1) respectively weighing the raw materials in parts by weight;
(2) adjusting the rotating speed of an internal mixer to 35-40 RPM, placing the low-ethylene EPDM raw rubber weighed in the step (1), active zinc oxide and stearic acid into the internal mixer, plasticating the raw rubber, controlling the temperature to be below 90 ℃, plasticating for 60 seconds, sequentially adding the weighed white filler, semi-reinforcing carbon black and paraffin oil, mixing, controlling the mixing temperature to be 140-150 ℃, and preparing a primary rubber compound;
(3) dropping the primary rubber prepared in the step (2) into an open mill for thin passing and roller wrapping for a plurality of times, blanking through a release agent to prepare a section of rubber, and standing for more than 8 hours;
(4) adjusting the rotating speed of an internal mixer to 20-25 RPM, placing the first-stage rubber prepared in the second step after parking in the internal mixer, adding the sulfur, the accelerator, the sulfur-containing accelerator and the moisture absorbent weighed in the step (1), and mixing at the mixing temperature of 80-90 ℃ for not less than 2 minutes; dropping into an open mill, passing through the mill thinly, wrapping with rollers for several times, discharging, standing, and making into final sponge rubber;
(5) placing the final sponge rubber prepared in the step (4) into an extruder, and preparing sealing strip products with various required shapes through an extrusion die;
(6) placing the sealing strip product prepared in the step (5) into a microwave oven and a hot air oven for vulcanization to prepare a vulcanized sealing strip product, wherein the vulcanization temperature range is 200-260 ℃, the microwave power range is 4.5-8.0 KW, and the vulcanization time is controlled to be 10-15 minutes;
(7) and (4) passing the vulcanized sealing strip product prepared in the step (6) through a curing oven, a cooling tank, a forming machine and a blanking machine to form a required semi-finished sealing strip.
After adopting the structure, the invention has the following beneficial effects: according to the low-temperature-resistant sponge rubber sealing strip and the production process thereof, the change of hardness of the product at low temperature is greatly reduced by calling the low-ethylene-content ethylene propylene diene monomer, paraffin oil and a low-sulfur high-acceleration peroxide vulcanization system, and the problems of difficult lifting of the sliding groove rubber and large door closing force of the sponge rubber are solved.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments; all other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. And, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
The embodiment provides a low temperature resistant sponge rubber sealing strip which comprises the following raw materials in parts by weight: 90 parts of low-ethylene EPDM raw rubber, 130 parts of semi-reinforcing carbon black, 90 parts of paraffin oil, 25 parts of white filler, 4 parts of active zinc oxide, 1.7 parts of stearic acid, 0.7 part of sulfur-containing promoter, 4 parts of promoter, 2.3 parts of foaming agent and 7 parts of moisture absorbent.
The embodiment also provides a preparation method of the low-temperature-resistant sponge rubber sealing strip, which comprises the following steps:
(1) respectively weighing the raw materials in parts by weight;
(2) adjusting the rotating speed of an internal mixer to 35-40 RPM, placing the low-ethylene EPDM raw rubber weighed in the step (1), active zinc oxide and stearic acid into the internal mixer, plasticating the raw rubber, controlling the temperature to be below 90 ℃, plasticating for 60 seconds, sequentially adding the weighed white filler, semi-reinforcing carbon black and paraffin oil, mixing, controlling the mixing temperature to be 145 ℃, and preparing a primary rubber compound;
(3) dropping the primary rubber prepared in the step (2) into an open mill for thin passing and roller wrapping for a plurality of times, blanking through a release agent to prepare a section of rubber, and standing for 9 hours;
(4) adjusting the rotating speed of an internal mixer to 20-25 RPM, placing the first-stage rubber prepared in the second step after placement into the internal mixer, adding the sulfur, the accelerator, the sulfur-containing accelerator and the moisture absorbent weighed in the step (1), and mixing at 85 ℃ for not less than 2 minutes; falling into an open mill for thin passing and roller wrapping for a plurality of times, discharging pieces, standing, and preparing into final sponge rubber;
(5) placing the final sponge rubber prepared in the step (4) into an extruder, and preparing sealing strip products with various required shapes through an extrusion die;
(6) placing the sealing strip product prepared in the step (5) into a microwave oven and a hot air oven for vulcanization to prepare a vulcanized sealing strip product, wherein the vulcanization temperature range is 230-250 ℃, the microwave power range is 6-7 KW, and the vulcanization time is controlled to be 14 minutes;
(7) and (4) passing the vulcanized sealing strip product prepared in the step (6) through a curing oven, a cooling tank, a forming machine and a blanking machine to form a required semi-finished sealing strip.
Example 2
The embodiment provides a low temperature resistant sponge rubber sealing strip which comprises the following raw materials in parts by weight: 95 parts of low-ethylene EPDM raw rubber, 135 parts of semi-reinforcing carbon black, 95 parts of paraffin oil, 27 parts of white filler, 4.5 parts of active zinc oxide, 1.6 parts of stearic acid, 0.65 part of sulfur-containing accelerator, 4.5 parts of accelerator, 2.5 parts of foaming agent and 6.5 parts of moisture absorbent.
The embodiment also provides a preparation method of the low-temperature-resistant sponge rubber sealing strip, which comprises the following steps:
(1) respectively weighing the raw materials in parts by weight;
(2) adjusting the rotating speed of an internal mixer to 35-40 RPM, placing the low-ethylene EPDM raw rubber weighed in the step (1), active zinc oxide and stearic acid into the internal mixer, plasticating the raw rubber, controlling the temperature to be below 90 ℃, plasticating for 60 seconds, sequentially adding the weighed white filler, semi-reinforcing carbon black and paraffin oil, mixing, and controlling the mixing temperature to be 140 ℃ to prepare primary rubber;
(3) dropping the primary rubber prepared in the step (2) into an open mill for thin passing and roller wrapping for a plurality of times, blanking through a release agent to prepare a section of rubber, and standing for 10 hours;
(4) adjusting the rotating speed of an internal mixer to 22-24 RPM, placing the first-stage rubber prepared in the second step after placement into the internal mixer, adding the sulfur, the accelerator, the sulfur-containing accelerator and the moisture absorbent weighed in the step (1), and mixing at 80 ℃ for not less than 3 minutes; falling into an open mill for thin passing and roller wrapping for a plurality of times, discharging pieces, standing, and preparing into final sponge rubber;
(5) placing the final sponge rubber prepared in the step (4) into an extruder, and preparing sealing strip products with various required shapes through an extrusion die;
(6) placing the sealing strip product prepared in the step (5) into a microwave oven and a hot air oven for vulcanization to prepare a vulcanized sealing strip product, wherein the vulcanization temperature range is 220-240 ℃, the microwave power range is 5-6 KW, and the vulcanization time is controlled to be 15 minutes;
(7) and (4) passing the vulcanized sealing strip product prepared in the step (6) through a curing oven, a cooling tank, a forming machine and a blanking machine to form a required semi-finished sealing strip.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The utility model provides a low temperature resistant sponge rubber sealing strip which characterized in that: the material comprises the following raw materials in parts by weight: 80-100 parts of low-ethylene EPDM raw rubber, 120-140 parts of semi-reinforcing carbon black, 80-100 parts of paraffin oil, 20-30 parts of white filler, 3.0-5.0 parts of active zinc oxide, 1.5-2 parts of stearic acid, 0.6-0.8 part of sulfur, 0.5-0.8 part of sulfur-containing accelerator, 3-5 parts of accelerator, 2-2.5 parts of foaming agent and 5-8 parts of moisture absorbent.
2. The low temperature resistant sponge rubber sealing strip according to claim 1, characterized in that: the material comprises the following raw materials in parts by weight: 85-95 parts of low-ethylene EPDM raw rubber, 125-135 parts of semi-reinforcing carbon black, 85-95 parts of paraffin oil, 22-28 parts of white filler, 3.5-4.5 parts of active zinc oxide, 1.6-1.9 parts of stearic acid, 0.65-0.75 part of sulfur, 0.6-0.7 part of sulfur-containing accelerator, 3.4-4.5 parts of accelerator, 2.1-2.4 parts of foaming agent and 6-7 parts of moisture absorbent.
3. The low temperature resistant sponge rubber sealing strip according to claim 1, characterized in that: the material comprises the following raw materials in parts by weight: 90 parts of low-ethylene EPDM raw rubber, 130 parts of semi-reinforcing carbon black, 90 parts of paraffin oil, 25 parts of white filler, 4 parts of active zinc oxide, 1.7 parts of stearic acid, 0.7 part of sulfur-containing accelerator, 4 parts of accelerator, 2.3 parts of foaming agent and 7 parts of moisture absorbent.
4. A production process of a low-temperature-resistant sponge rubber sealing strip is characterized by comprising the following steps: the method comprises the following steps:
(1) respectively weighing the raw materials in parts by weight;
(2) adjusting the rotating speed of an internal mixer to 35-40 RPM, placing the low-ethylene EPDM raw rubber, the active zinc oxide and the stearic acid weighed in the step (1) into the internal mixer, plasticating the raw rubber, controlling the temperature to be below 90 ℃, plasticating for 60 seconds, sequentially adding the weighed white filler, the semi-reinforcing carbon black and the paraffin oil, mixing, controlling the mixing temperature to be 140-150 ℃, and preparing a primary rubber compound;
(3) dropping the primary rubber prepared in the step (2) into an open mill for thin passing and roller wrapping for a plurality of times, blanking through a release agent to prepare a section of rubber, and standing for more than 8 hours;
(4) adjusting the rotating speed of an internal mixer to 20-25 RPM, placing the first-stage rubber prepared in the second step after parking in the internal mixer, adding the sulfur, the accelerator, the sulfur-containing accelerator and the moisture absorbent weighed in the step (1), and mixing at the mixing temperature of 80-90 ℃ for not less than 2 minutes; falling into an open mill for thin passing and roller wrapping for a plurality of times, discharging pieces, standing, and preparing into final sponge rubber;
(5) placing the final sponge rubber prepared in the step (4) into an extruder, and preparing sealing strip products with various required shapes through an extrusion die;
(6) placing the sealing strip product prepared in the step (5) into a microwave oven and a hot air oven for vulcanization to prepare a vulcanized sealing strip product, wherein the vulcanization temperature range is 200-260 ℃, the microwave power range is 4.5-8.0 KW, and the vulcanization time is controlled to be 10-15 minutes;
(7) and (4) passing the vulcanized sealing strip product prepared in the step (6) through a curing oven, a cooling tank, a forming machine and a blanking machine to form a required semi-finished sealing strip product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011496238.XA CN112679866A (en) | 2020-12-17 | 2020-12-17 | Low-temperature-resistant sponge rubber sealing strip and production process thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011496238.XA CN112679866A (en) | 2020-12-17 | 2020-12-17 | Low-temperature-resistant sponge rubber sealing strip and production process thereof |
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| CN112679866A true CN112679866A (en) | 2021-04-20 |
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Cited By (3)
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| CN112852062A (en) * | 2020-12-30 | 2021-05-28 | 上海荣南科技有限公司 | Low-density sponge rubber material for replacing butyl adhesive sticker of trunk sealing strip and composite extrusion process of low-density sponge rubber material |
| CN113444322A (en) * | 2021-06-03 | 2021-09-28 | 瀚德（中国）汽车密封系统有限公司 | Low-temperature-resistant sponge sealing strip and preparation method thereof |
| WO2023113707A1 (en) * | 2021-12-16 | 2023-06-22 | Standard Profil Otomotiv Sanayi ve Ticaret A.S. | Epdm with high electrical conductivity suitable for sealing extrusion |
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| CN112852062A (en) * | 2020-12-30 | 2021-05-28 | 上海荣南科技有限公司 | Low-density sponge rubber material for replacing butyl adhesive sticker of trunk sealing strip and composite extrusion process of low-density sponge rubber material |
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Application publication date: 20210420 |