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A kind of anti-aging EPDM composition and preparation method thereof
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A technology of EPDM rubber and composition, which is applied in the field of rubber materials, and can solve problems such as slow operation, low production efficiency, and low pass rate
Active Publication Date: 2020-03-24
无锡朴业高分子材料科技有限公司
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Problems solved by technology
[0003] The existing formula has the following problems: a. The customer requires that the hardness change in the 100°C*70h heat-resistant aging test is between 0 and +10. The hardness change of the current formula is about +10, which is on the edge of the performance required by the customer. This kind of result requires high precision for the operation of the material workers. If there is a little carelessness in the process operation, the change of heat resistance and aging hardness may be unqualified; b. During the vulcanization process of the product, due to the acidity of ordinary white carbon black, the vulcanized product The affinity with the mold is relatively high, it is laborious to demould, the product is easy to tear, and the qualified rate is low
c. Because it is difficult to remove the film during vulcanization, the operation of workers is slow when removing the film, and the production efficiency is low
Method used
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Embodiment 1
[0027] A kind of preparation method of described EPDM composition, described preparation method comprises the steps:
[0028] (1) Add 100 parts of EPDM rubber (the mass ratio of 3072M to 4045M is 70:50) into the internal mixer and masticate for 3 minutes;
[0029] (2) After that, add 5 parts of zincoxide, 1 part of stearic acid, 2.5 parts of PEG4000, and knead for 1 minute;
[0030] (3) After that, add 35 parts of basic white carbon black 3230, 140 parts of light calciumcarbonate (containing 40 parts of nano-light calcium), 65 parts of paraffin oil for mixing and kneading, lift and drag once in the middle, clean once, and finally After the temperature reaches 120°C, unload;
[0031] (4) the material of step (3) is pressed into a film of 10mm, and cooled;
[0032] (5) When the temperature of the film drops to 50°C, add the film to the internal mixer, and add 1.5 parts of accelerator CZ, 1.0 parts of accelerator M, 1.5 parts of accelerator BZ, 0.5 parts of accelerator DTDM, ...
Embodiment 2
[0039] A kind of preparation method of described EPDM composition, described preparation method comprises the steps:
[0040] (1) Add 100 parts of EPDM rubber (the mass ratio of 3072M to 4045M is 70:50) into the internal mixer and masticate for 2 minutes;
[0041] (2) After that, add 5 parts of zincoxide, 1 part of stearic acid, 2.5 parts of PEG4000, and knead for 2 minutes;
[0042] (3) After that, add 35 parts of basic white carbon black 3230, 140 parts of light calcium carbonate (containing 40 parts of nano-light calcium), 65 parts of paraffin oil for mixing and kneading, lift and drag once in the middle, clean once, and finally After the temperature reaches 100°C, unload;
[0043] (4) the material of step (3) is pressed into a film of 10mm, and cooled;
[0044] (5) When the temperature of the film drops to 55°C, add the film to the internal mixer, and add 1.5 parts of accelerator CZ, 1.0 parts of accelerator M, 1.5 parts of accelerator BZ, 0.5 parts of accelerator DTDM,...
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Abstract
The invention discloses an anti-aging ethylene propylene dienemonomer rubber composition. The composition is prepared from the following raw materials in parts by weight: 100 parts of ethylene propylene dienemonomer rubber, 5 parts of zincoxide, 1 part of stearic acid, 35 parts of alkaline white carbon black 3230, 140 parts of calciumbicarbonate, 65 parts of paraffin base oil, 2.5 parts of PEG4000, 1.5 parts of accelerant CZ, 1.0 part of accelerant M, 1.5 parts of accelerant BZ, 0.5 part of accelerant DTDM, 0.5 part of accelerant TT and 1 part of S. According to the anti-aging ethylene propylene dienemonomer rubber composition disclosed by the invention, common white carbon black is changed into existing novel white carbon black 3230; under the condition that a large amount of heat-resisting anti-aging agents are not added, the heat resistance of a product is improved and the rubber composition has better anti-aging property.
Description
technical field [0001] The invention relates to the technical field of rubber materials, in particular to a rubber composition with excellent aging resistance prepared from ethylene propylene diene monomer rubber as a main raw material. Background technique [0002] Before the discovery of alkaline silica, we wanted to improve the aging resistance of the formula. The general method was to add heat-resistant anti-aging agent. The addition of this anti-aging agent has two disadvantages. One is that the price of the anti-aging agent itself is high. , after adding, the formula cost will be increased; secondly, the compatibility of anti-aging agent and rubber has certain limitations, and the amount of addition is not well controlled, which will easily cause surface blooming and affect the appearance of rubber products. Now, we use alkaline silica instead of ordinary silica, which can not only improve the heat resistance of the product, but also have no effect on the appearance. ...
Claims
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Application Information
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