Rubber matrix for butyl rubber sealing plug, composition, vulcanized rubber and preparation method thereof
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A technology of butyl rubber and rubber matrix, which is applied in the field of vulcanized rubber, can solve problems such as dependence, and achieve the effects of avoiding migration, good physical and mechanical properties, and easy mixing and processing
Active Publication Date: 2022-03-01
CHINA PETROLEUM & CHEM CORP +1
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[0007] The purpose of the present invention is to overcome the problem of complete dependence on imported raw materials in the prior art, and to provide raw materials with better mixing processing and molding performance, faster vulcanization speed, and higher production efficiency
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preparation example Construction
[0052] In the method for preparing vulcanized rubber of the present invention, it may also include discharging the mixed rubber for a period of time, for example, for 3-5 hours.
[0053] In the method for preparing vulcanized rubber of the present invention, it may also include that the second-stage mixed rubber is thinned longitudinally in an open mill, for example, for 6 times, and then sheeted.
[0054] Exemplarily, the injection molding process described in the present invention includes: weighing - kneading - preformed sheet - vacuum injection molding (primary vulcanization) - furnace setting (secondary vulcanization) - punching - —Cleaning—Packing and warehousing. Among them, the injection molding process, that is, the primary vulcanization process, the temperature is controlled at 200-220°C, the vacuum degree is ≥700mmHg, the pressure is 2-3MPa, and the vulcanization time is 120-300s; the furnace setting process, that is, the secondary vulcanization process, the tempera...
Embodiment 6
[0099] The present embodiment adopts the formula similar to embodiment 1 to carry out, and difference is, the butyl rubber (1#) of low molecular weight in the high degree of unsaturation used in the present embodiment is 3 parts by weight, and all the other are all the same as embodiment 1 The same, the specific formulations are listed in Table 3.
Embodiment 7
[0101] The present embodiment adopts the formula similar to embodiment 1 to carry out, and difference is, the butyl rubber (1#) of low molecular weight in the high degree of unsaturation used in the present embodiment is 25 parts by weight, all the other are all the same as embodiment 1 The same, the specific formulations are listed in Table 3.
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Abstract
The invention relates to the field of vulcanized rubber, and discloses a rubber matrix for a butyl rubber sealing plug, a composition, vulcanized rubber and a preparation method of the vulcanized rubber. The rubber matrix contains low-unsaturation high-molecular-weight butyl rubber and high-unsaturation middle-low-molecular-weight butyl rubber; the content weight ratio of the low-unsaturation high-molecular-weight butyl rubber to the high-unsaturation medium-low-molecular-weight butyl rubber is 100: (3-25); the butyl rubber with low unsaturation degree and high molecular weight has the characteristic of bimodal molecular weight distribution. According to the composition containing the rubber matrix for the butyl rubber sealing plug, provided by the invention, all the components are matched, so that the obtained vulcanized rubber has higher hardness and lower compression set, and also has more excellent sealing property, thermo-oxidative aging resistance and dimensional stability.
Description
technical field [0001] The invention relates to the field of vulcanized rubber, in particular to a rubber matrix, composition, vulcanized rubber and a preparation method thereof for butyl rubber sealing plugs for aluminum electrolytic capacitors. Background technique [0002] Aluminum electrolytic capacitor is an important electronic component, and rubber sealing plug is an important component used to seal the electrolyte in the capacitor structure. The sealing performance and insulation performance of the sealing plug are the key factors to ensure the service life of the capacitor. With the continuous advancement of electronic technology, the performance requirements of electronic components—capacitors are getting higher and higher, especially capacitors with high temperature, high pressure and long life. [0003] Butyl rubber has become the preferred material for long-life capacitor sealing plugs due to its excellent sealing performance. It has become an inevitable develo...
Claims
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