CN114261047B - Rubber ring for heating pipeline and preparation process thereof - Google Patents
Rubber ring for heating pipeline and preparation process thereof Download PDFInfo
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- CN114261047B CN114261047B CN202111574012.1A CN202111574012A CN114261047B CN 114261047 B CN114261047 B CN 114261047B CN 202111574012 A CN202111574012 A CN 202111574012A CN 114261047 B CN114261047 B CN 114261047B
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- 229920001971 elastomer Polymers 0.000 title claims abstract description 119
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 238000010438 heat treatment Methods 0.000 title claims description 20
- 239000000463 material Substances 0.000 claims abstract description 53
- 230000007704 transition Effects 0.000 claims abstract description 36
- 238000004519 manufacturing process Methods 0.000 claims abstract description 18
- 238000003780 insertion Methods 0.000 claims description 11
- 230000037431 insertion Effects 0.000 claims description 11
- 239000002994 raw material Substances 0.000 claims description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 5
- 239000004636 vulcanized rubber Substances 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 4
- 229920000181 Ethylene propylene rubber Polymers 0.000 claims description 3
- 239000006229 carbon black Substances 0.000 claims description 3
- 239000008036 rubber plasticizer Substances 0.000 claims description 3
- 239000011787 zinc oxide Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 7
- 238000004073 vulcanization Methods 0.000 abstract description 6
- 238000002788 crimping Methods 0.000 abstract description 2
- 238000013386 optimize process Methods 0.000 abstract description 2
- 238000004886 process control Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 15
- 238000007789 sealing Methods 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920002943 EPDM rubber Polymers 0.000 description 1
- 229920001875 Ebonite Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
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- 239000011347 resin Substances 0.000 description 1
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Abstract
A rubber ring for a thermal pipeline is used at the assembling position of a socket thermal pipeline and comprises a high-hardness part, a low-hardness part and a transition part between the high-hardness part and the low-hardness part, wherein the hardness of the transition part gradually changes from high to low from one end close to the high-hardness part to one end close to the low-hardness part, and the difference of performance drops of an intermediate layer material when the intermediate layer material is combined with a soft base rubber material and a hard base rubber material is relieved. According to the preparation process of the rubber ring, raw rubber sheet combinations with different hardness are used as intermediate layer materials for gradual transition, a high-hardness part and a low-hardness part are preformed at low temperature in a pressurizing mode to obtain base rubber with an accurate shape and a certain density, then three materials are overlapped step by step and then are subjected to high-temperature pressurizing and final forming, final vulcanization integrated crimping is achieved in the final high-temperature pressurizing and final forming, industrial manufacturing which can be completed by using only one set of die is achieved through a ring-insert type combined structure in the whole process, and an optimized process route is provided for integral forming of the whole multi-performance rubber ring material through process control.
Description
Technical Field
The utility model relates to the technical field of assembly of heating power pipelines, in particular to a rubber ring for a heating power pipeline and a preparation process thereof.
Background
The thermodynamic pipeline is an assembled pipeline and is provided with an insertion end and a receiving end for receiving the insertion end, when the thermodynamic pipeline is assembled, a soft and hard combined rubber ring is usually adopted, a low-hardness part is used for front section sealing, a high-hardness part is used for rear section sealing, and the rear section is more prone to bearing pressure, and the rubber ring is introduced in the patent with the patent number of 202021458878.7, the name of sealing rubber ring and pipeline connecting structure applied to the socket pipeline, or the patent with the patent number of 201720157865.8, the name of anti-drop rubber sealing ring and pipeline connecting system. The soft and hard combined rubber ring in the prior art is manufactured by adopting an adhesive mode or an integral vulcanization mode, but cannot overcome the problems of poor joint and easy breakage and easy cracking of a joint caused by performance differences, particularly different deformability and stress of the joint, particularly the probability of the problems under the complex axial and radial acting force of the assembled heating power pipeline and the complex temperature and corrosive fluid influence of the heating power pipeline.
There have been some theories that intermediate layers can be added to properly transition when manufacturing rubber materials with soft and hard rubber overlapped, but no practical solution is applied to the manufacturing of rubber rings for heating power pipelines, and no reference means is available to guide the construction of the intermediate layers and the integral molding of the whole multi-performance rubber ring material.
Disclosure of Invention
In order to solve the problems, the utility model provides a rubber ring for a heating power pipeline and a preparation process thereof, provides a practical scheme for manufacturing the rubber ring for the heating power pipeline by using the integral rubber ring containing materials with different hardness, provides a new means for performance transition and material joint between materials with different hardness, and provides an optimized process route for integral molding of the whole multi-performance rubber ring material.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a rubber ring for a heat distribution pipeline, wherein the heat distribution pipeline is an assembled pipeline and is provided with an insertion end and a receiving end for receiving the insertion end, the rubber ring is used for an assembly position of the insertion end and the receiving end, the rubber ring comprises a high-hardness part, a low-hardness part and a transition part positioned between the high-hardness part and the low-hardness part, and the hardness of the transition part gradually changes from high to low from one end close to the high-hardness part to one end close to the low-hardness part.
Preferably, the rubber ring is made of vulcanized rubber material, and the Shore hardness is between 45 and 85.
A preparation process of a rubber ring for a thermal pipeline is used for preparing the rubber ring for the thermal pipeline for assembling a socket joint part, and comprises the following steps of:
step 1, low temperature pressurized preforming of high hardness portion and low hardness portion
Preparing a hot-press forming die, wherein the hot-press forming die comprises a first insert ring, a second insert ring and a third insert ring, the first insert ring is prepared according to the shape of a high-hardness part of the rubber ring to be manufactured, the second insert ring is prepared according to the shape of a transition part of the rubber ring to be manufactured, and the third insert ring is prepared according to the shape of a low-hardness part of the rubber ring to be manufactured;
when the high-hardness part is preformed, the mixed high-hardness rubber material is filled into a cavity of a first half mold of a hot-press forming mold, the cavity of the first half mold is the same as the high-hardness part in shape, the surface of the high-hardness rubber material is sequentially covered with a second inlaid ring, a third inlaid ring and a second half mold, the mold is closed, the temperature and the pressure are raised on a hot press, and the second half mold is a half mold with the same cavity as the low-hardness part in shape and can accommodate the third inlaid ring;
when the low-hardness part is preformed, the mixed low-hardness rubber material is filled into a cavity of a second half die of the hot-press forming die, a second insert ring, a first insert ring and a first half die are sequentially covered on the surface of the low-hardness rubber material, the die is closed, the temperature and the pressure are raised on a hot press, and the first half die can accommodate the first insert ring;
step 2, preparation of raw materials for transition part
Cutting raw films with different hardness according to the required hardness and shape of each layer of the transition part to form a raw material for forming the transition part;
step 3, high-temperature pressurizing final forming of the integral rubber ring
The method comprises the steps of accommodating a preformed high-hardness part in the step 1 in a cavity of a first half die, accommodating a preformed low-hardness part in the step 1 in a cavity of a second half die, stacking raw rubber pieces with different hardness, which are obtained by cutting in the step 2, according to the sequence that the hardness changes gradually from one end close to the high-hardness part to one end close to the low-hardness part from high to low, closing the dies, and heating and pressurizing on a hot press to obtain a final formed integral rubber ring;
wherein the low temperature of the low-temperature pressurizing preforming in the step 1 is not higher than 120 ℃, and the high temperature of the high-temperature pressurizing final forming in the step 3 is higher than the low temperature of the low-temperature pressurizing preforming in the step 1, and is not higher than 180 ℃ at most.
In the preparation process of the rubber ring for the heating power pipeline, in the step 1, the second insert ring is positioned at the parting surface of the first half mold and the second half mold, and after the first half mold and the second half mold are clamped, the second insert ring is positioned at the first half mold and at the second half mold; in the step 3, a transition part composed of raw rubber sheets with different hardness is positioned at the parting surface of the first half mould and the second half mould, and after the first half mould and the second half mould are clamped, one part of the transition part composed of raw rubber sheets with different hardness is positioned in the first half mould, and the other part is positioned in the second half mould.
Preferably, the shore hardness of the prepared high hardness portion is 70-85, and the shore hardness of the prepared low hardness portion is 45-60.
Preferably, the number of raw rubber pieces with different hardness in the step 3 is more than 3 layers, preferably 5-12 layers.
Preferably, the hardness values of the adjacent layers of film stock are uniformly transited.
As an example, the vulcanized rubber material used is a heat-resistant ethylene propylene rubber-based material provided with a rubber plasticizer, and the filler is selected from carbon black and zinc oxide.
Preferably, the low temperature range of the low temperature pressurizing preforming in the step 1 is 90-120 ℃, the high temperature range of the high temperature pressurizing final forming in the step 3 is 140-170 ℃, and the heat preservation and pressure maintaining time of the low temperature pressurizing preforming in the step 1 is not more than 45min.
Preferably, the pressurizing pressure of the low-temperature pressurizing pre-forming in the step 1 is the same as the pressurizing pressure of the high-temperature pressurizing final forming in the step 3, or the pressurizing pressure of the low-temperature pressurizing pre-forming in the step 1 is smaller than the pressurizing pressure of the high-temperature pressurizing final forming in the step 3.
The utility model has the beneficial effects that:
according to the rubber ring for the thermal pipeline, the transition part between the high-hardness part and the low-hardness part is gradually changed from high to low from one end close to the high-hardness part to one end close to the low-hardness part, so that the difference of performances of the middle layer material when being combined with two different soft and hard base rubber materials is relieved, and compared with the middle layer material with single performances, the rubber ring for the thermal pipeline is connected with the soft and hard base rubber materials which are more suitable for large differences.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required for the embodiments will be briefly described below.
Fig. 1 is a schematic diagram (cross-sectional view) of hardness composition of a rubber ring for a thermal pipeline according to an embodiment of the present utility model.
Fig. 2 is a block diagram (sectional view) of a mold insert used in combination in the process for manufacturing a rubber ring for a heat pipe according to an embodiment of the present utility model.
Reference numerals illustrate:
in fig. 1: a high hardness portion 1, a low hardness portion 2, and a transition portion 3;
in fig. 2: a first insert 4, a second insert 5, and a third insert 6.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Example 1
The utility model provides a rubber ring for heating power pipeline, heating power pipeline is assembled pipeline, has the insertion end and accepts the accepting end of insertion end, the rubber ring is used for the equipment department of insertion end and accepting end.
As shown in fig. 1, the rubber ring of the present embodiment includes a high hardness portion 1, a low hardness portion 2 and a transition portion 3 between the high hardness portion 1 and the low hardness portion 2, wherein the hardness of the transition portion 3 gradually changes from high to low from one end near the high hardness portion 1 to one end near the low hardness portion 2, 6 levels are exemplified in the figure, more or less than the high hardness portion 1 can be actually produced, but more than 3 levels are necessarily ensured, and 5-12 levels are the best choice.
In order to meet the sealing requirement of a socket type heating power pipeline, the rubber ring manufactured by the embodiment is made of vulcanized rubber, the Shore hardness is between 45 and 85, specifically, the Shore hardness of the manufactured high-hardness part 1 is between 70 and 85, the Shore hardness of the manufactured low-hardness part 2 is between 45 and 60, and the hardness values of the interlayer materials adjacent step by step in the transition part are in uniform transition.
The utility model is not limited in principle to the type of vulcanized rubber material used for the whole rubber ring, and can be a single-matrix rubber material or a multi-matrix rubber material as long as the connection requirement of the heating power pipeline is basically met. As a preferable example, the rubber material can be selected from heat-resistant ethylene propylene rubber-based heat-resistant corrosion-resistant rubber materials which are specially developed for heating pipelines and are provided with rubber plasticizers, the filler is carbon black and zinc oxide, and the rubber material contains components such as required rubber vulcanizing agent, rubber accelerator, rubber dispersing agent, anti-aging agent, petroleum resin and the like, and rubber materials with different hardness can be flexibly obtained by adjusting the proportion of a matrix to the plasticizer, the proportion of the filler or auxiliary materials, the vulcanization density and the like.
Example 2
The embodiment provides an industrialized preparation process for the rubber ring for the heating pipeline in the embodiment 1. Specifically, the method comprises the following steps:
step 1, low temperature pressurized preforming of high hardness portion 1 and low hardness portion 2
In this step, a hot-press forming die is first prepared, and the hot-press forming die adopts a two-half die structure commonly used in the prior art, but in this embodiment, in order to adapt to the low-temperature pressurizing preforming of the high-hardness part 1 and the low-hardness part 2, as shown in fig. 2, three insert rings, namely a first insert ring 4, a second insert ring 5 and a third insert ring 6, are manufactured for the hot-press forming die in a matching manner, wherein the shape of the first insert ring 4 is prepared according to the shape of the high-hardness part 1 of the rubber ring to be manufactured, the shape of the second insert ring 5 is prepared according to the shape of the transition part 3 of the rubber ring to be manufactured, and the shape of the third insert ring 6 is prepared according to the shape of the low-hardness part 2 of the rubber ring to be manufactured.
In the low-temperature pressurizing preforming process of the high-hardness part 1 and the low-hardness part 2, the hot-press forming die and the related insert are specifically used as follows:
when the high-hardness part 1 is preformed, the mixed high-hardness rubber material is filled into a cavity of a first half mold of a hot-press forming mold, the cavity of the first half mold is the same as the high-hardness part 1 in shape, the surface of the high-hardness rubber material is sequentially covered with a second insert ring 5, a third insert ring 6 and a second half mold, the mold is closed, the temperature and the pressure are raised on a hot press, and the second half mold is a half mold with the same cavity as the low-hardness part 2 in shape and can accommodate the third insert ring 6.
Similarly, when the low-hardness part 2 is preformed, the mixed low-hardness rubber material is filled into a cavity of a second half die of the hot-press forming die, the surface of the low-hardness rubber material is sequentially covered with a second insert 5, a first insert 4 and the first half die, the die is closed, and the temperature and the pressure are raised on the hot press, and the first half die can accommodate the first insert 4.
The upper and lower relationship of the two half molds is not important in actual manufacturing, and as can be clearly understood in conjunction with fig. 1 and 2, the second insert 5 is located at the parting plane of the first half mold and the second half mold, and after the first half mold and the second half mold are clamped, a part of the second insert 5 is located in the first half mold and a part of the second insert is located in the second half mold.
The purpose of the low temperature pressurized preforming in this step is to obtain a matrix rubber with an accurate shape and a certain density, the temperature is to facilitate the extrusion flow and sufficient venting of the compound, but should not be too high, it is only necessary to keep the temperature and pressure for a short time at a certain temperature difference from the maximum vulcanization temperature, similar to IIR, EPDM, NBR base compounds commonly used in production and some mixed compounds, with a temperature range of 90-120 ℃ being preferred, the holding time generally not exceeding 45min.
Step 2, transition section 3 raw material preparation
In this step, the raw rubber pieces with different hardness are cut according to the required hardness and shape of each layer of the transition part 3, and as the raw material for forming the transition part 3, the raw rubber pieces are not vulcanized or not vulcanized sufficiently, and can be co-vulcanized and laminated with each other and with the base rubber in hot pressing, and the raw material can be taken and cut on a production line without special manufacturing.
Step 3, high-temperature pressurizing final forming of the integral rubber ring
In the step, the preformed high-hardness part 1 in the step 1 is accommodated in a cavity of a first half die, the preformed low-hardness part 2 in the step 1 is accommodated in a cavity of a second half die, the raw rubber pieces with different hardness obtained by cutting in the step 2 are stacked in a sequence that the hardness changes gradually from one end close to the high-hardness part 1 to one end close to the low-hardness part 2, and the raw rubber pieces are assembled and heated and pressurized on a hot press to obtain the final formed integral rubber ring. In this step, a transition portion 3 composed of green sheets of different hardness is located at the parting plane of the first and second mold halves, and after the first and second mold halves are closed, the transition portion 3 composed of green sheets of different hardness is located partly in the first mold half and partly in the second mold half.
The high temperature of the high temperature compression final forming in this step is a temperature higher than the low temperature of the low temperature compression pre-forming in step 1 and eventually reaches the highest vulcanization temperature, typically selected at 140-170 ℃, typically not exceeding 180 ℃. In the whole preparation process, the pressurizing pressure of the low-temperature pressurizing preforming in the step 1 and the pressurizing pressure of the high-temperature pressurizing final forming in the step 3 are set according to the process requirement and can be the same or different, and preferably, the pressurizing pressure of the low-temperature pressurizing preforming in the step 1 is smaller than the pressurizing pressure of the high-temperature pressurizing final forming in the step 3, so that the pressure connection and the combination of the materials of the later layers are more facilitated.
The rubber ring for the thermal pipeline, which has the Shore hardness of the high-hardness part 1 of 70-85 and the Shore hardness of the low-hardness part 2 of 45-60, is prepared through the steps, the number of raw rubber sheets with different hardness in the step 3 is controlled to be overlapped between 5-12 layers, so that the raw rubber sheets of adjacent layers are overlapped in a mode of uniformly transiting the hardness values, and finally the raw rubber sheets are hot-pressed into a whole.
In summary, according to the rubber ring for the thermal pipeline provided by the embodiment of the utility model, the transition part 3 between the high-hardness part 1 and the low-hardness part 2 is gradually changed from high to low from one end close to the high-hardness part to one end close to the low-hardness part due to the fact that the hardness is gradually changed from high to low, the difference of performances of the middle layer material when being combined with two different base rubber materials, namely soft base rubber materials and hard base rubber materials, is relieved, the rubber ring is more suitable for being connected with the soft base rubber materials and the hard base rubber materials with large differences than the single-performance middle layer material, in the preparation process, raw rubber sheet combinations with different hardness are used as middle layer materials for gradual transition, the high-hardness part 1 and the low-hardness part 2 are subjected to pressure preforming at a high temperature to obtain base rubber with an accurate shape and a certain density, three part materials are subjected to pressure forming at a high temperature after gradual superposition, final vulcanization integral crimping is realized in final high-temperature pressure forming, and the whole process is realized through a inlaid ring type combination structure.
The foregoing is merely a preferred embodiment of the present utility model and various modifications and variations can be made thereto by those skilled in the art without departing from the spirit and scope of the present utility model. Thus, it is intended that the present utility model also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (9)
1. A process for preparing a rubber ring for a heating power pipeline, wherein the heating power pipeline is an assembled pipeline and is provided with an insertion end and a receiving end for receiving the insertion end, the rubber ring is used for assembling the insertion end and the receiving end, the rubber ring comprises a high-hardness part (1), a low-hardness part (2) and a transition part (3) positioned between the high-hardness part (1) and the low-hardness part (2), and the hardness of the transition part (3) gradually changes from high to low from one end close to the high-hardness part (1) to one end close to the low-hardness part (2); the preparation process is characterized by comprising the following steps of:
step 1, low-temperature pressurized preforming of the high hardness portion (1) and the low hardness portion (2)
Preparing a hot-press forming die, wherein the hot-press forming die comprises a first insert ring (4), a second insert ring (5) and a third insert ring (6), the shape of the first insert ring (4) is prepared according to the shape of a high-hardness part (1) of the rubber ring to be manufactured, the shape of the second insert ring (5) is prepared according to the shape of a transition part (3) of the rubber ring to be manufactured, and the shape of the third insert ring (6) is prepared according to the shape of a low-hardness part (2) of the rubber ring to be manufactured;
when the high-hardness part (1) is preformed, the mixed high-hardness rubber material is filled into a cavity of a first half mold of a hot-press forming mold, the cavity of the first half mold is the same as the high-hardness part (1), the surface of the high-hardness rubber material is sequentially covered with a second insert ring (5), a third insert ring (6) and a second half mold, the mold is closed, the temperature and the pressure are raised on a hot press, and the second half mold is a half mold with the same cavity as the low-hardness part (2), and can accommodate the third insert ring (6);
when the low-hardness part (2) is preformed, the mixed low-hardness rubber material is filled into a cavity of a second half mould of a hot-press forming mould, a second inlay ring (5), a first inlay ring (4) and a first half mould are sequentially covered on the surface of the low-hardness rubber material, the mould is closed, the temperature and the pressure are raised on a hot press, and the first half mould can accommodate the first inlay ring (4);
step 2, preparation of raw material for transition portion (3)
Cutting the raw rubber sheets with different hardness according to the required hardness and shape of each layer of the transition part (3) to form the raw material of the transition part (3);
step 3, high-temperature pressurizing final forming of the integral rubber ring
Accommodating the preformed high-hardness part (1) in the step 1 in a cavity of a first half die, accommodating the preformed low-hardness part (2) in the step 1 in a cavity of a second half die, stacking the raw rubber pieces with different hardness, which are obtained by cutting in the step 2, according to the sequence that the hardness gradually changes from one end close to the high-hardness part (1) to one end close to the low-hardness part (2), closing the die, and heating and pressurizing on a hot press to obtain the final-molded integral rubber ring;
wherein the low temperature of the low-temperature pressurizing preforming in the step 1 is not higher than 120 ℃, and the high temperature of the high-temperature pressurizing final forming in the step 3 is higher than the low temperature of the low-temperature pressurizing preforming in the step 1, and is not higher than 180 ℃ at most.
2. A process for preparing a rubber ring for a thermal pipeline according to claim 1, characterized in that in said step 1, said second insert (5) is positioned at the parting plane of said first half-mold and second half-mold, and after said first half-mold and second half-mold are clamped, said second insert (5) is positioned partially in the first half-mold and partially in the second half-mold; in the step 3, a transition part (3) composed of raw rubber sheets with different hardness is positioned at the parting surface of the first half mold and the second half mold, and after the first half mold and the second half mold are clamped, one part of the transition part (3) composed of raw rubber sheets with different hardness is positioned in the first half mold and one part of the transition part (3) composed of raw rubber sheets with different hardness is positioned in the second half mold.
3. A process for preparing a rubber ring for a thermal pipeline according to claim 1, characterized in that the shore hardness of the prepared high hardness portion (1) is 70-85 and the shore hardness of the prepared low hardness portion (2) is 45-60.
4. A process for preparing a rubber ring for a heat pipe according to claim 3, wherein the number of raw rubber sheets with different hardness in step 3 is more than 3 layers.
5. The process for preparing rubber rings for thermal pipelines according to claim 4, wherein the number of raw rubber sheets with different hardness in the step 3 is 5-12 layers.
6. A process for preparing a rubber ring for a thermal pipeline as claimed in claim 4 or claim 5, wherein the hardness values of adjacent layers of rubber sheets are uniformly transited.
7. The process for preparing rubber rings for thermal pipelines according to claim 1, characterized in that the vulcanized rubber material used is a heat-resistant ethylene propylene rubber-based material provided with rubber plasticizers, and the filler is selected from carbon black and zinc oxide.
8. The process for preparing a rubber ring for a heat pipe according to claim 1, wherein the low temperature range of the low temperature pressurizing preform in the step 1 is 90-120 ℃, the high temperature range of the high temperature pressurizing final molding in the step 3 is 140-170 ℃, and the heat preservation and pressure maintaining time of the low temperature pressurizing preform in the step 1 is not more than 45min.
9. The process for preparing a rubber ring for a heat pipe according to claim 7, wherein the pressure of the low-temperature pressurizing preform in the step 1 is the same as the pressure of the high-temperature pressurizing final molding in the step 3, or the pressure of the low-temperature pressurizing preform in the step 1 is smaller than the pressure of the high-temperature pressurizing final molding in the step 3.
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| CN202111574012.1A CN114261047B (en) | 2021-12-21 | 2021-12-21 | Rubber ring for heating pipeline and preparation process thereof |
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| CN202111574012.1A CN114261047B (en) | 2021-12-21 | 2021-12-21 | Rubber ring for heating pipeline and preparation process thereof |
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| CN114261047B true CN114261047B (en) | 2023-12-19 |
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| JP2001238851A (en) * | 2000-02-29 | 2001-09-04 | Fuji Photo Optical Co Ltd | Flexible tube of endoscope |
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| CN210679480U (en) * | 2019-06-20 | 2020-06-05 | 明月镜片股份有限公司 | Combined gasket for producing polarized lens |
| CN111251642A (en) * | 2020-01-16 | 2020-06-09 | 蓝世梁 | Double-layer elastic sole and manufacturing method thereof |
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