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Vulcanized silicone rubber and preparing method thereof

A technology for vulcanizing silicone rubber and silicone rubber raw rubber, applied in the field of vulcanized silicone rubber and its preparation, can solve the problems of affecting damping performance and mechanical properties, silicone rubber cannot be vulcanized, and material compatibility is not good, and achieve excellent mechanical properties. , The effect of improving mechanical properties and excellent mechanical properties

Inactive Publication Date: 2019-06-28
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the platinum catalyst two-component addition type silicone rubber cannot be compounded with polyborosilane to prepare damping materials, because polyborosilane will cause platinum catalyst poisoning, so that the silicone rubber cannot be vulcanized
[0005] In the prior art, the damping property of silicone rubber is also improved by blending modification. Although this method is simple and easy to operate, the compatibility of the material is not good, and cracking and delamination are easy to occur under the action of external force after blending. , seriously affecting its damping performance and mechanical properties

Method used

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  • Vulcanized silicone rubber and preparing method thereof
  • Vulcanized silicone rubber and preparing method thereof

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preparation example Construction

[0037] The present invention also provides a kind of preparation method of above-mentioned vulcanized silicone rubber, comprises the following steps:

[0038] Mix raw silicone rubber, peroxide and damping modifier, and vulcanize at 170-180°C to obtain vulcanized silicone rubber.

[0039] The components and proportions of the raw silicone rubber, peroxide and damping modifier are the same as above, and will not be repeated here. In the present invention, there is no special limitation on the sources of the raw silicone rubber, peroxide and damping modifier, which may be commercially available.

[0040] The temperature of the vulcanization treatment is 170-180°C. In an embodiment of the present invention, the temperature of the vulcanization treatment is 175°C, 170°C or 180°C. In an embodiment of the present invention, the time for the vulcanization treatment is 5-15 minutes. In some embodiments of the present invention, the vulcanization treatment time is 10 minutes, 15 minute...

Embodiment 1

[0045] Homemade polyborosiloxane (PBS):

[0046] Disperse 26.6mg of boric acid evenly in toluene, then add 5g of PDMS, stir at room temperature for 2h, heat in an oil bath at 120°C for 48h, then remove the toluene under reduced pressure at 60°C to obtain polyborosilane polymer (PBS);

[0047] 10 parts by weight of methyl vinyl silicone rubber raw rubber with a molar mass of 70,0000 g / mol and a vinyl content of 0.18 wt%, adding 0.1 part by weight of vulcanizing agent 2,5-dimethyl-2, 5-bis(tert-butylperoxy)hexane, using a twin-stick vulcanizer to mix it evenly. Then 2 parts by weight of self-made PBS with a weight average molecular weight of 11,000 was added, and treated with a flat vulcanizer at 175° C. for 10 minutes to obtain vulcanized silicone rubber. Use the MCR302 rheometer of Austria Anton Paar to test its frequency sweep curve (room temperature) under linear strain. The test standard is based on GB / T 33095.1-2016 Determination of rheological properties by dynamic rotor...

Embodiment 2

[0052] Add 20 parts by weight of methyl phenyl vinyl silicone rubber raw rubber with a molar mass of 400,0000 g / mol, a phenyl content of 30 wt%, and a vinyl content of 0.20 wt%, and add 0.2 parts by weight of vulcanizing agent 2,5- Dimethyl-2,5-bis(tert-butylperoxy)hexane, after mixing evenly, add 10 parts by weight of DOW 3179, treated with a flat vulcanizer at 175°C for 10 minutes to obtain vulcanized silicone rubber. Use the MCR302 rheometer of Austria Anton Paar to test its frequency sweep curve (room temperature) under linear strain. The test standard is based on GB / T 33095.1-2016 Determination of rheological properties by dynamic rotorless rheometer for unvulcanized rubber Part 1: frequency scanning method. Reflects the value of the loss factor of the material under different speed impact conditions (see figure 1 ).

[0053] from figure 1 It can be seen that the vulcanized silicone rubber prepared in this example has excellent damping performance, and its damping fa...

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Abstract

The invention provides vulcanized silicone rubber and a preparing method thereof. The vulcanized silicone rubber is obtained by conducting vulcanizing treatment on 8-22 parts by weight of crude silicone rubber through 1-90 parts by weight of a damping modifier and 0.1-0.3 part by weight of peroxide. The damping modifier comprises polyborosiloxane. The crude silicone rubber is adopted as the base rubber, the peroxide serves as a vulcanizing agent, the damping modifier comprises polyborosiloxane, the damping modifier can form a stable chemical crosslinking network together with the base rubber,and the mechanical performance of the vulcanizing rubber is improved; meanwhile, in the vulcanizing treatment system, reversible breakage and recombination happen to non-covalent bonds, the reversiblephysical crosslinking network structure is formed, great energy is absorbed, the damping performance of the material is improved, and moreover, the mechanical performance of the material is good.

Description

technical field [0001] The invention relates to the technical field of polymer composite materials, in particular to a vulcanized silicone rubber and a preparation method thereof. Background technique [0002] Silicone rubber is a semi-inorganic and semi-organic linear polymer whose main chain is composed of alternating silicon-oxygen bonds and whose side chains contain organic groups. It is an important type of silicone products. According to different curing reaction mechanisms, silicone rubber can be divided into two types: condensation type and addition type. Compared with condensation-type silicone rubber, addition-type silicone rubber does not produce by-products during the vulcanization process and has better mechanical properties. The common addition type silicone rubber is divided into peroxide vulcanized silicone rubber at high temperature and platinum catalyst two-component addition type silicone rubber at room temperature. Silicone rubber has been widely used a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/08C08K5/14
Inventor 潘鸽许东华石彤非王晓伟付志磊
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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