CN108638553B - Processing method of low-hardness rubber sealing ring - Google Patents
Processing method of low-hardness rubber sealing ring Download PDFInfo
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- CN108638553B CN108638553B CN201810392646.7A CN201810392646A CN108638553B CN 108638553 B CN108638553 B CN 108638553B CN 201810392646 A CN201810392646 A CN 201810392646A CN 108638553 B CN108638553 B CN 108638553B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0082—Producing articles in the form of closed loops, e.g. rings
- B29D99/0085—Producing articles in the form of closed loops, e.g. rings for sealing purposes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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Abstract
The invention discloses a processing method of a low-hardness rubber sealing ring, and belongs to the field of processing of rubber products. The method comprises the following steps: a) adding a part of plasticizer during material mixing, and processing into a medium-hardness rubber sealing ring; b) spraying residual plasticizer to the rubber sealing ring in the step a) for softening, and finally forming the low-hardness rubber sealing ring. The softening process of the step b) is as follows: the rubber sealing ring is arranged in a roller, the roller is arranged in a closed box body, the temperature of the box body is controlled, and the roller is rotated and simultaneously sprayed with a plasticizer; and after the plasticizer is completely absorbed by the rubber sealing ring, the softening state is continuously kept. The hardness of the medium-hardness rubber sealing ring is 35-45 Shore A. The method of the invention overcomes the defects of extremely low rubber Mooney and difficult post processing caused by adding the plasticizer once in the prior art, increases the Mooney viscosity and hardness of the rubber, improves the production efficiency, has high product qualification rate and is beneficial to popularization.
Description
Technical Field
The invention belongs to the field of rubber product processing, and particularly relates to a processing method of a low-hardness rubber sealing ring.
Background
The low-hardness rubber sealing ring is widely applied to sealing places such as washing machines, refrigerators, automobile air filtering systems and the like. When the low-hardness rubber sealing ring is produced in the prior art, particularly when the hardness is not more than 30 Shore A, a large amount of plasticizer needs to be filled in the rubber material, so that the Mooney of the rubber material is extremely low, and the product processing is very difficult. The main performance is that the rubber material is not dispersed uniformly during mixing; when in preforming, the sizing material is too soft and has high cold flowability, the shape is not easy to keep, the preforming is difficult, preformed rubber blanks are easy to adhere to each other, and the preformed rubber blanks are not easy to store; air pocket is easy to generate during vulcanization; difficult trimming, etc.
Through retrieval, related applications also exist in the prior art, for example, the application with Chinese patent application No. CN201310747395.7 and publication date 2014.04.16 discloses a low-hardness high-damping rubber composition and a preparation method thereof, the composition combines butyl rubber and polynorbornene rubber, the application range of material damping is improved, the application temperature is-40 to 80 ℃, and the heat resistance and ozone resistance of the material are improved to a certain extent; the invention can be blended to prepare the material with wide temperature range, low hardness and high damping, and improve the application range of the damping material.
The Chinese patent application No. CN201710773513.X with the publication date of 2017.11.24 discloses a preparation method of a low-hardness rubber sealing element material, which comprises the steps of material mixing preparation, mixed latex preparation and sealing element material preparation. Compared with the prior art, the invention has the following advantages: according to the invention, the raw materials with different properties are respectively processed, so that the obtained material reaches 32-36 Shore hardness, the mixed latex has better oil resistance due to the preparation, can meet the technical index requirements of VW2.8.1-P35, has better excellent performances such as high temperature resistance and resilience, can realize better reinforcing effect by using a common reinforcing filler, is simple in process flow and easy to control conditions, prolongs the service life by about 30% after being used for preparing the sealing element for the automobile gearbox converter, and is convenient to popularize and use.
Although the methods of the two applications improve the performance of the sealing ring material to a certain extent, in the methods, all the softening agents are added during mixing, so that the mixing uniformity of the material is affected, the problems cannot be fundamentally solved, and the production efficiency cannot be improved.
Chinese patent application No. CN201310515327.8, published as 2014.02.26, relates to a low-hardness rubber gasket, which comprises 125 parts of fluororubber, 14 parts of acrylonitrile, 2 parts of magnesium oxide, 2 parts of zinc oxide, 2 parts of nano calcium carbonate, 2 parts of stearic acid, 7 parts of toluene diisocynate, 18 parts of magnesium oxide, 4 parts of calcium hydroxide, 1 part of fluorine wax, 6 parts of carbon black, 17 parts of chlorinated paraffin, 23 parts of polypropylene and 8 parts of dodecylbenzene; the low-hardness fluororubber can be obtained while keeping good physical and mechanical properties. By adopting the formula, the production resources of enterprises can be greatly saved, the production cost of the enterprises is reduced, the processing fluidity is good, and the fluororubber can be conveniently processed to be made into various fluororubber products, such as framework oil seals, gaskets, diaphragms, rubber pipes, O-shaped rings and the like; the fluororubber product has excellent chemical resistance and good low-temperature flexibility. However, the method of this application has the following drawbacks: the 17 parts of chlorinated paraffin is added into the fluororubber, and the fluororubber has stronger polarity and is very soluble with the chlorinated paraffin, so that the fluororubber is very easy to stick to a mold in the vulcanization process, and the risk of oil injection of the same product is higher.
In summary, the above improved methods start with the selection of the preparation materials of the rubber seal ring, and do not effectively improve the production and processing technology, so that the problems of extremely low mooney of the rubber material and difficulty in later processing during the production and processing of the low-hardness rubber seal ring cannot be fundamentally solved, and therefore, based on the defects of the prior art, the improvement of the existing processing technology is urgently needed, the fundamental problem of the processing and production is solved by adopting a more convenient processing method, the product quality and the production efficiency are improved, and the manufacturing cost is reduced.
Disclosure of Invention
1. Technical problem to be solved
The invention provides a novel processing method of a low-hardness rubber sealing ring, aiming at the problems that in the prior art, when the low-hardness rubber sealing ring is produced, particularly when the hardness is not more than 30 Shore A, a large amount of plasticizer needs to be filled in a rubber material, so that the Mooney property of the rubber material is extremely low, and the subsequent processing process is difficult.
2. Technical scheme
A processing method of a low-hardness rubber sealing ring comprises the following steps:
the invention provides a processing method of a low-hardness rubber sealing ring, which comprises the following steps:
a) adding a part of plasticizer during material mixing, and processing into a medium-hardness rubber sealing ring;
b) spraying residual plasticizer to the rubber sealing ring in the step a) for softening, and finally forming the low-hardness rubber sealing ring.
As a further improvement of the present invention, the softening process of step b) is: the rubber sealing ring is arranged in a roller, the roller is arranged in a closed box body, the temperature of the box body is controlled, and the roller is rotated and simultaneously sprayed with a plasticizer; and after the plasticizer is completely absorbed by the rubber sealing ring, the softening state is continuously kept.
As a further improvement of the invention, the hardness of the medium-hardness rubber sealing ring is 35-45 Shore A; the hardness of the low-hardness rubber sealing ring is 20-30 Shore A.
As a further improvement of the invention, the mass of the plasticizer added during the material mixing is not more than 50% of the total mass, and the material mixing is divided into 3 steps: 1) mixing for 50-60 seconds at 50-100 ℃; 2) mixing for 150-180 seconds at the temperature of 80-110 ℃; 3) 30-40 seconds at the temperature of 80-100 ℃.
As a further improvement of the present invention, said step a) comprises the steps of:
a-1) mixing materials: adding part of plasticizer during material mixing;
a-2) preforming: preforming the material mixed in the step a-1) into a circular rubber blank;
a-3) vulcanization: producing a rubber sealing ring with medium hardness by a compression molding mode on the rubber blank preformed in the step a-2);
a-4) trimming: trimming and removing the flash on the rubber sealing ring produced in the step a-3).
As a further improvement of the invention, in the step b), the temperature in the box body is controlled to be 70-80 ℃, and the rotating speed of the roller is controlled to be 10-20 r/min.
As a further improvement of the invention, in the step b), the time for continuously keeping the softening state is 30-50 minutes.
As a further improvement of the invention, in the step b), the volume of the rubber sealing ring does not exceed 3/4 of the volume of the roller, the wall of the roller is of a net structure, and the diameter of the net hole is smaller than the outer diameter of the rubber sealing ring.
As a further improvement of the invention, the plasticizer is mineral oil or an ester.
In the step a-1), the process of mixing the materials is shown in the following table:
TABLE 1 Process for compounding of materials
The ethylene propylene rubber Keltan 4869 is oil-extended rubber, and 100 parts of paraffin oil is filled in the rubber during synthesis.
3. Advantageous effects
The technical scheme provided by the invention has the following remarkable effects when used for processing the low-hardness rubber sealing ring:
(1) according to the processing method of the low-hardness rubber sealing ring, the sealing ring can be produced into the easily-processed medium-hardness rubber sealing ring, and then the hardness of the rubber sealing ring is reduced to the required hardness through later softening, so that the product quality and the production efficiency are improved, the manufacturing cost is reduced, the method has simple steps, the cost is low, the product qualification rate is high, and the hardness of the final product can reach 20-30 Shore A; the problem that the Mooney property of the rubber material is extremely low in the processing process in the prior art, so that the subsequent processing process is difficult is solved; in the prior art, the hardness of the product obtained by adopting a method of adding the plasticizer at one time is about 25 +/-3 ℃, but the difficulty of oil mixing and refining of the produced rubber material is high, various substances in the rubber material are not uniformly dispersed, and the product is easy to stick to a die and difficult to trim during vulcanization and is only about 70% qualified.
(2) According to the processing method of the low-hardness rubber sealing ring, when the rubber material is mixed, the addition of the plasticizer is greatly reduced, so that the Mooney viscosity and the hardness of the rubber material are increased, and the rubber material is easy to mix, so that the processing method can obviously improve the mixing efficiency, and compared with a method for adding the plasticizer at one time in the prior art, the mixing time can be shortened by 60% at most; in addition, as the Mooney viscosity and hardness of the rubber compound are increased, the rubber compound is easier to perform than low-hardness rubber compound, the rubber blank is easier to store and circulate, the preforming efficiency can be improved by 47% compared with the method in the prior art, the product is easier to edge, and the edge trimming efficiency is increased by 30%.
(3) According to the processing method of the low-hardness rubber sealing ring, as the Mooney viscosity and hardness of the rubber material are increased, the air is easier to exhaust during vulcanization, the product percent of pass is higher, and the product percent of pass can reach 98.8% compared with the method in the prior art.
(4) According to the processing method of the low-hardness rubber sealing ring, the one-time loading amount is large during later softening, the total volume of the rubber sealing ring can reach 3/4 of the volume of the roller, and the softening efficiency is high; and the plasticizer is sprayed on the surface of the product in a spraying mode, so that the softening of the product is more uniform, and the surface hardness of the product can be controlled within +/-1 Shore A.
(5) The processing method of the low-hardness rubber sealing ring is simple in operation steps, low in cost and beneficial to popularization.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
The embodiment provides a processing method of a low-hardness rubber sealing ring, which comprises the following steps:
(1) mixing materials: in the process of mixing materials, the plasticizer is only added to 50% of the total mass, if too much plasticizer is added, the hardness of the rubber material is too low, and the uniformity of material mixing is influenced; too low hardness of the rubber compound also affects the vulcanization processing of the later-stage product.
The procedure for kneading the materials of example 1 is shown in Table 2.
Table 2 example 1 material mixing procedure
(2) Preforming: preforming the mixed material in the step (1) into a circular rubber blank;
(3) and (3) vulcanization: and (3) producing the rubber sealing ring by the preformed rubber blank in the step (2) in a compression molding mode, wherein the hardness of the product produced in the step is 35 Shore A.
(4) Trimming: trimming and removing the flash on the rubber sealing ring produced in the step (3);
(5) softening: the rubber sealing ring is arranged in the roller, the volume of the rubber sealing ring is 3/4 of the volume of the roller, the wall of the roller is of a net structure, and the mesh holes are smaller than the outer diameter of the rubber sealing ring, so that the rubber sealing ring is prevented from falling off the roller; placing the roller with the rubber sealing ring in a closed box body, wherein the temperature in the box body is 70 ℃; rotating the drum at a rotational speed of 20 rpm; the rest 50% of the plasticizer is uniformly sprayed on the surface of the rubber sealing ring by using a spray gun, and the plasticizer can be absorbed by the soft rubber sealing ring because the plasticizer and the rubber sealing ring have better compatibility, and the future and absorbed plasticizer can be collected and repeatedly sprayed on the surface of the rubber sealing ring until the plasticizer is completely absorbed. After the plasticizer is completely absorbed by the rubber sealing ring, the softening state is continuously kept for 30 minutes, so that the plasticizer is more uniformly diffused in the rubber sealing ring by being absorbed by the rubber sealing ring, and the hardness of the rubber sealing ring is more uniform; the hardness of the final product is 20 Shore A.
When the method of the embodiment is used for processing the low-hardness rubber sealing ring, the following remarkable effects are achieved:
(1) when the rubber material is mixed, the addition of the plasticizer is greatly reduced, so that the Mooney viscosity and the hardness of the rubber material are increased, the rubber material is easier to mix, and the mixing time is shortened by about 50%;
(2) the Mooney viscosity and hardness of the rubber material are increased, the rubber material is easier to perform than low-hardness rubber material, the rubber blank is easier to store and circulate, and the performing efficiency is increased by 40%;
(3) the Mooney viscosity and the hardness of the rubber material are increased, the air is easier to exhaust during vulcanization, and the product percent of pass is 98.5%;
(4) as the Mooney viscosity and the hardness are increased, the product is easier to trim, and the efficiency is increased by 30 percent;
(5) the one-time loading amount is large during later softening, the total volume of the rubber sealing ring can reach 3/4 of the volume of the roller, and the softening efficiency is high;
(6) the plasticizer is sprayed on the surface of the product in a spraying mode, so that the softening of the product is more uniform, and the surface hardness of the product is uniform and can be controlled within +/-1 Shore A.
Example 2
The processing method of the low-hardness rubber sealing ring comprises the following steps:
(1) mixing materials: in the process of mixing materials, 40 percent of the total mass of the plasticizer is added;
the procedure for kneading the materials of example 2 is shown in Table 3.
Table 3 example 2 material mixing procedure
(2) Preforming: preforming the mixed material into a cylindrical rubber blank;
(3) and (3) vulcanization: producing the rubber sealing ring in a compression molding mode, wherein the hardness of the product is 40 Shore A;
(4) trimming: trimming and removing the flash on the rubber sealing ring;
(5) softening: the rubber sealing ring is arranged in the roller, the volume of the rubber sealing ring does not exceed 3/4 of the volume of the roller, the wall of the roller is of a net structure, and the mesh holes are smaller than the outer diameter of the rubber sealing ring, so that the rubber sealing ring is prevented from falling from the roller; placing the roller with the rubber sealing ring in a closed box body, wherein the internal temperature of the box body is 75 ℃; rotating the drum at a rotational speed of 15 rpm; the rest 60% of the plasticizer is uniformly sprayed on the surface of the rubber sealing ring by using a spray gun, and the plasticizer is absorbed by the soft rubber sealing ring due to the good compatibility of the plasticizer and the rubber sealing ring, and the future and absorbed plasticizer is collected and repeatedly sprayed on the surface of the rubber sealing ring until the plasticizer is completely absorbed. After the plasticizer is completely absorbed by the rubber sealing ring, the softening state is continuously kept for 40 minutes, so that the plasticizer is more uniformly diffused in the rubber sealing ring by being absorbed by the rubber sealing ring, the hardness of the rubber sealing ring is more uniform, and the hardness of a finally produced product is 25 Shore A.
When the method of the embodiment is used for processing the low-hardness rubber sealing ring, the following remarkable effects are achieved:
(1) when the rubber material is mixed, the addition of the plasticizer is greatly reduced, so that the Mooney viscosity and the hardness of the rubber material are increased, the rubber material is easier to mix, and the mixing time is shortened by about 55%;
(2) the Mooney viscosity and hardness of the rubber material are increased, the rubber material is easier to perform than low-hardness rubber material, the rubber blank is easier to store and circulate, and the performing efficiency is increased by 45%;
(3) the Mooney viscosity and the hardness of the rubber material are increased, the air is easier to exhaust during vulcanization, and the product percent of pass is 98.7%;
(4) as the Mooney viscosity and the hardness are increased, the product is easier to trim, and the trimming efficiency is increased by 30 percent;
(5) by adopting the method, the one-time loading amount is large during the later softening, the total volume of the rubber sealing ring can reach 3/4 of the volume of the roller, and the softening efficiency is high.
(6) The plasticizer is sprayed on the surface of the product in a spraying mode, so that the softening of the product is more uniform. The surface hardness of the product can be controlled within +/-1 Shore A.
Example 3
The processing method of the low-hardness rubber sealing ring comprises the following steps:
(1) mixing materials: in the process of mixing materials, the plasticizer is only added into 30 percent of the total mass;
the procedure for kneading the materials of example 3 is shown in Table 4.
Table 4 example 3 material mixing procedure
(2) Preforming: preforming the mixed material into a cylindrical rubber blank;
(3) and (3) vulcanization: producing a rubber sealing ring in a compression molding mode; the hardness of the product is 45 Shore A;
(4) trimming: trimming and removing the flash on the rubber sealing ring;
(5) softening: the rubber sealing ring is arranged in the roller, the volume of the rubber sealing ring does not exceed 3/4 of the volume of the roller, the wall of the roller is of a net structure, and the mesh holes are smaller than the outer diameter of the rubber sealing ring, so that the rubber sealing ring is prevented from falling from the roller; placing the roller with the rubber sealing ring in a closed box body, wherein the internal temperature of the box body is 80 ℃; a rotary drum, wherein the rotary speed is controlled to be 10 rpm; the rest 70% of the plasticizer is uniformly sprayed on the surface of the rubber sealing ring by using a spray gun, and the plasticizer can be absorbed by the soft rubber sealing ring because the plasticizer and the rubber sealing ring have better compatibility, and the future and absorbed plasticizer can be collected and repeatedly sprayed on the surface of the rubber sealing ring until the plasticizer is completely absorbed. After the plasticizer is completely absorbed by the rubber sealing ring, the softening state is continuously kept for 50 minutes, so that the plasticizer is more uniformly diffused in the rubber sealing ring by being absorbed by the rubber sealing ring, the hardness of the rubber sealing ring is more uniform, and the hardness of a finally produced product is 30 +/-Shore A.
When the method of the embodiment is used for processing the low-hardness rubber sealing ring, the following remarkable effects are achieved:
(1) when the rubber material is mixed, the addition of the plasticizer is greatly reduced, so that the Mooney viscosity and the hardness of the rubber material are increased, the rubber material is easier to mix, and the mixing time is shortened by about 60%;
(2) the Mooney viscosity and hardness of the rubber material are increased, the rubber material is easier to perform than low-hardness rubber material, the rubber blank is easier to store and circulate, and the performing efficiency is increased by 47%;
(3) the Mooney viscosity and the hardness of the rubber material are increased, the air is easier to exhaust during vulcanization, and the product percent of pass is 98.8%;
(4) as the Mooney viscosity and the hardness are increased, the product is easier to trim, and the trimming efficiency is increased by 30 percent;
(5) by adopting the method, the one-time loading amount is large during the later softening, the total volume of the rubber sealing ring can reach 3/4 of the volume of the roller, and the softening efficiency is high;
(6) the plasticizer is sprayed on the surface of the product in a spraying mode, the softening of the product is more uniform, and the hardness of the surface of the product can be controlled within +/-1 Shore A.
Comparative example 1
The comparative example 1 is a comparative example produced by adding the plasticizer at one time in the prior art, and comprises the following steps.
(1) Mixing materials: in the process of mixing materials, adding all the plasticizers; the mixing procedure of the materials of comparative example 1 is shown in the table
5, respectively.
TABLE 5 compounding procedure of comparative example 1 materials
(2) Preforming: preforming the mixed material into a cylindrical rubber blank;
(3) and (3) vulcanization: producing a rubber sealing ring in a compression molding mode;
(4) trimming: trimming and removing the flash on the rubber sealing ring;
the hardness of the product obtained by adopting the method of adding the plasticizer at one time in the prior art is about 25 Shore A, but the difficulty of oil blending of the produced rubber material is high, various substances in the rubber material are not uniformly dispersed, the product is easy to stick to a mold during vulcanization, the trimming is difficult, and the product is only about 70% qualified.
Comparative example 2
This embodiment is substantially the same as embodiment 1 except that: the internal temperature of the cabinet was controlled at 30 ℃.
Because the temperature in the box body is too low, the plasticizer is absorbed by the soft rubber sealing ring at a low speed, the absorption time is 4 hours, and the production efficiency is low.
Comparative example 3
This embodiment is substantially the same as embodiment 1 except that: the internal temperature of the cabinet was controlled at 100 ℃.
The inside temperature of box when 100 ℃, has certain influence to the rubber performance, can make rubber appear ageing a little, and rubber can give out certain smell under high temperature environment in addition, causes the influence to workman's operation travelling comfort.
Table 6 shows a comparison of the parameters of the examples and the comparative examples.
TABLE 6 comparison of the parameters of the examples and comparative examples
As can be seen from Table 6, the preforming efficiency can be improved by 40-50%, the trimming efficiency can be improved by 30%, the product percent of pass is about 99%, the production efficiency of each link is obviously improved, the product percent of pass is high, and the method is favorable for popularization. And the method of adding the plasticizer at one time in the prior art has the defects of incapability of forming and difficult trimming due to too low hardness, and the final product yield is not high.
The invention and its embodiments have been described above schematically and without limitation. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent.
Claims (7)
1. A processing method of a low-hardness rubber sealing ring is characterized by comprising the following steps: the method comprises the following steps:
a) adding a part of plasticizer during material mixing, and processing into a medium-hardness rubber sealing ring; the hardness of the medium-hardness rubber sealing ring is 35-45 Shore A; the mass of the added plasticizer is not more than 50% of the total mass of the plasticizer during the material mixing, and the material mixing is divided into 3 steps: 1) mixing for 50-60 seconds at 50-100 ℃; 2) mixing for 150-180 seconds at the temperature of 80-110 ℃; 3) 30-40 seconds at the temperature of 80-100 ℃;
b) spraying residual plasticizer to the rubber sealing ring in the step a) for softening, and finally forming a low-hardness rubber sealing ring, wherein the hardness of the low-hardness rubber sealing ring is 20-30 Shore A.
2. The method for processing a low-hardness rubber seal ring according to claim 1, characterized in that: the softening process of the step b) is as follows: the rubber sealing ring is arranged in a roller, the roller is arranged in a closed box body, the temperature of the box body is controlled, and the roller is rotated and simultaneously sprayed with a plasticizer; and after the plasticizer is completely absorbed by the rubber sealing ring, the softening state is continuously kept.
3. The method for processing a low-hardness rubber seal ring according to claim 1, characterized in that: the step a) comprises the following steps:
a-1) mixing materials: adding part of plasticizer during material mixing;
a-2) preforming: preforming the material mixed in the step a-1) into a circular rubber blank;
a-3) vulcanization: producing a rubber sealing ring with medium hardness by a compression molding mode on the rubber blank preformed in the step a-2);
a-4) trimming: trimming and removing the flash on the rubber sealing ring produced in the step a-3).
4. The method for processing a low-hardness rubber seal ring according to claim 2, characterized in that: in the step b), the temperature in the box body is controlled to be 70-80 ℃, and the rotating speed of the roller is controlled to be 10-20 rpm.
5. The method for processing a low-hardness rubber seal ring according to claim 2, characterized in that: in the step b), the time for continuously keeping the softening state is 30-50 minutes.
6. The method for processing a low-hardness rubber seal ring according to claim 2, characterized in that: in the step b), the volume of the rubber sealing ring does not exceed 3/4 of the volume of the roller, the wall of the roller is of a net structure, and the diameter of the mesh is smaller than the outer diameter of the rubber sealing ring.
7. The method for processing a low-hardness rubber seal ring according to claim 1 or 2, characterized in that: the plasticizer is mineral oil or esters.
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| CN105295203A (en) * | 2015-11-18 | 2016-02-03 | 厦门市金汤橡塑有限公司 | Low hardness EPDM composition adhered to metal member |
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