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Vibration damping siloxane composition

A technology of vibration damping and composition, applied in the field of vibration damping siloxane composition, can solve the problems such as the reduction of vibration damping performance, and achieve the effects of low responsiveness, excellent storage stability, and excellent vibration damping performance

Inactive Publication Date: 2006-09-06
DOW CORNING TORAY SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, these compositions generally undergo changes during prolonged storage and / or use, resulting in a reduction in their vibration damping properties

Method used

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  • Vibration damping siloxane composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1000g viscosity is 10,000mm 2 / s of trimethylsiloxy-terminated dimethylpolysiloxane, 460 g consisting only of CH 3 SiO 3 / 2 Methyl polysilsesquioxane powder (average particle diameter = 20 μm) composed of siloxane units and 30 g of surface hydrophobic wet-process silica powder (pH = 7) prepared in Reference Example 1 were added to the Ross mixer middle. The resulting mixture was homogenized by scraping with a Ross mixer at low speed (150 rpm). The homogeneous mixture was then further mixed and kneaded for 2 hours under reduced pressure (100 mmHg). The viscosity of the obtained silicone composition was 70 Pa·s. The vibration damping properties of the silicone compositions were measured at 25°C and 60°C. The silicone composition was then stored for 3 months before its vibration damping properties were measured at 25°C. The change in vibration damping performance can be calculated by the following formula. Various results are listed in Table 1.

[0035]

[0036] ...

Embodiment 2

[0040] 1000g viscosity is 30,000mm 2 / s of trimethylsiloxy-terminated dimethylpolysiloxane, 800g consisting only of CH 3 SiO 3 / 2 Methyl polysilsesquioxane powder (average particle diameter = 20 μm) composed of siloxane units and 25 g of surface hydrophobic wet-process silica powder (pH = 7) prepared in Reference Example 1 were added to the Ross mixer middle. The resulting mixture was homogenized by scraping with a Ross mixer at low speed (150 rpm). The homogeneous mixture was then further mixed and kneaded for 2 hours under reduced pressure (100 mmHg). The viscosity of the obtained silicone composition was 1000 Pa·s.

[0041] The vibration damping properties of the silicone composition were measured as described in Example 1 for immediate (tan δ) 1 and (tanδ) after a three-month aging period 2 To measure the change of its vibration damping performance (Δtanδ). These results are listed in Table 1. The viscosity of the silicone composition was measured after storage for ...

Embodiment 3

[0043] 1000g viscosity is 20,000mm 2 / s of trimethylsiloxy-terminated dimethylpolysiloxane, 500g consisting only of CH 3 SiO 3 / 2 Methyl polysilsesquioxane powder (average particle diameter = 20 μm) composed of siloxane units and 30 g of surface hydrophobic wet-process silica powder (pH = 7) prepared in Reference Example 1 were added to the Ross mixer middle. The resulting mixture was homogenized by scraping with a Ross mixer at low speed (150 rpm). The homogeneous mixture was then further mixed and kneaded for 2 hours under reduced pressure (100 mmHg). The viscosity of the obtained silicone composition was 500 Pa·s.

[0044] The vibration damping properties of the silicone composition were measured as described in Example 1 for immediate (tan δ) 1 and (tanδ) after a three-month aging period 2 To measure the change of its vibration damping performance (Δtanδ). These results are listed in Table 1. The viscosity of the silicone composition was measured after storage for 1...

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Abstract

A vibration damping silicone composition that exhibits an excellent vibration damping performance and long-term storage stability comprising a silicone oil, a silicone resin powder that is solid at room temperature, and a surface-hydrophobic silica powder having a pH of greater than 6 but less than 9. The composition is particularly useful in shock absorbers for electronic and / or electrical equipment such as compact disk players, compact disk changers, mini-disk players, and car navigation devices.

Description

field of invention [0001] The present invention relates to a vibration damping silicone composition, and more particularly, the present invention relates to a vibration damping silicone composition excellent in long-term storage stability. Background technique [0002] Many kinds of vibration damping compositions containing viscous liquid and solid powder have been proposed, for example, a viscous liquid (such as silicone oil) and solid Vibration damping compositions of powders such as silica powder, glass powder or silicone resin powder. Japanese laid-open patent application No. Hei 10-251517 (251,517 / 1998) describes a vibration damping composition containing silicone resin powder and a viscous liquid such as silicone oil. Japanese laid-open patent application No. Hei 10-281202 (281,202 / 1998) describes a viscous liquid mixture containing silsesquioxane powder and non-surface-treated wet-process silica fine powder in silicone oil. Japanese Publish...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04F16F15/02C08K9/06C09K3/00F16F9/00F16F9/30
CPCY10T428/2995F16F9/30C08L83/04Y10T428/2982F16F9/006C08L83/00
Inventor 小林秀树林正之
Owner DOW CORNING TORAY SILICONE CO LTD
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