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A self-separating oil compound rubber with high temperature resistance and low compression set and preparation method thereof
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A technology of permanent deformation and low compression, applied in the field of self-separating oil compound and its preparation, can solve the problems of unreliable high-speed sealing, poor mechanical properties, high compression set, and improve the low-compression set and self-separation Effects of improved oil properties, good mechanical properties
Active Publication Date: 2022-05-17
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD +1
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[0006] In view of the above-mentioned existing problems, the purpose of the present invention is to provide a self-separating oil compound with high temperature resistance and low compression set, which improves the poor heat resistance of existing silicone rubber as a dynamic sealing material, high compression set, and mechanical failure. Poor performance, unreliable high-speed sealing, and low service life
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Embodiment 1
[0045] A self-separating oil compound rubber with high temperature resistance and low compression set, the preparation method of which is as follows:
[0046] Put 89 parts of vinyl mole fraction 0.08%, 8 parts of vinyl mole fraction 0.16%, 3 parts of methyl vinyl silicone rubber with vinyl mole fraction 1% into the kneader, and carry out nitrogen passivation treatment to the kneader; 8.4 Parts of fumed silica and 3.36 parts of hydroxy silicone oil are added to the kneader and kneaded with methyl vinyl silicone rubber. After mixing evenly, the remaining 19.8 parts of silicon dioxide are added in 3 times and mixed evenly. After mixing evenly, gradually raise the temperature, pass nitrogen protection throughout, raise the temperature to 120°C, turn off the nitrogen, start vacuuming, the vacuum degree is -0.09Mpa, gradually raise the temperature to 155°C, and maintain it for 1.5 hours, then release the vacuum, and switch to nitrogen; Cool the obtained product to 100°C, and add 6.6...
Embodiment 2
[0048] A self-separating oil compound rubber with high temperature resistance and low compression set, the preparation method of which is as follows:
[0049] Other conditions are the same as in Example 1, except that: after all the benzyl silicone oil is added to the silicone rubber and mixed evenly, 0.03 parts of metal compound additive magnesium hydroxide is added and mixed for 30 minutes; the obtained rubber is cooled to room temperature , discharge and filter.
Embodiment 3
[0051] A self-separating oil compound rubber with high temperature resistance and low compression set, the preparation method of which is as follows:
[0052] Other conditions are the same as in Example 1, except that: after all the benzyl silicone oil is added to the silicone rubber and mixed uniformly, 1.3 parts of modifier nano cerium oxide / nano lanthanum oxide compound, nano cerium oxide and nano cerium oxide are added. The weight ratio of nano-lanthanum oxide is 1:2, and the mixture is mixed for 30 minutes; the obtained rubber material is cooled to room temperature, discharged and filtered.
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Abstract
A high-temperature-resistant, low-compression-set self-separating oil compound and its preparation method, the compound comprising the following raw materials: methyl vinyl silicone rubber, reinforcing filler, structure control agent, and self-separating oil additive and other additives, the other additives also include a modifier, the modifier is selected from at least one of nano-iron oxide-doped gas-phase nano-titanium dioxide, or a compound of nano-cerium oxide and nano-lanthanum oxide. The self-separating oil compound prepared by adding a modifier in the present invention has good heat resistance stability, can be used for a long time in the range of -70°C-280°C, and can also be used for multiple times in a short period of time in the range of 280°C-350°C; The present invention also unexpectedly finds that there is a synergistic effect between the used modifier and magnesium hydroxide, and adjusting the amount of the two can obtain a rubber compound with better resistance to compression set; the present invention adopts three kinds of specific ethylene The methyl vinyl silicone rubber with base content is used as raw rubber, which has an unexpected effect on improving the comprehensive mechanical properties of the mixed rubber.
Description
technical field [0001] The invention relates to the field of silicone rubber production, in particular to a self-separating oil compound rubber with high temperature resistance and low compression set and a preparation method thereof. Background technique [0002] Silicone rubber is a polymer material with both inorganic and organic properties. The main chain is alternately connected by Si-O-Si bonds, and the side chains are various substituents connected by Si-C bonds. The substituents can be base, vinyl or other organic groups. Compared with ordinary carbon chain rubber, silicone rubber has better heat resistance (long-term use at 260°C). Based on this performance, silicone rubber is widely used as a sealing material in aerospace, power electronics industry and automotive machinery industry. . However, with the further development of science and technology, the temperature and pressure of the working environment of sealing materials are gradually increasing, and the perf...
Claims
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