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Silicon rubber composition and its preparation process and use

A technology of silicone rubber composition and silicone raw rubber, which is applied in the field of silicone rubber composition and its preparation, can solve problems such as resistance to hydrolysis and unsatisfactory bonding, and achieve the effect of improving bonding strength

Inactive Publication Date: 2005-01-19
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the Si-O-M (M represents metal atom) bond is not resistant to hydrolysis, known silane coupling agents are not ideal for improving the bonding between silicone rubber and difficult-to-bond metals

Method used

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  • Silicon rubber composition and its preparation process and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Prepare silicone rubber according to the following ratio:

[0020] 107 raw silicon rubber (Beijing Chemical Plant) 100 parts by weight

[0021] Ethyl Tetrasilicate (Beijing Xinzhong Chemical Factory) 3 parts by weight

[0022] Dibutyltin dilaurate (Beijing Chemical Plant) 0.4 parts by weight

[0023] No. 2 white carbon black (Shenyang Chemical Plant) 10 parts by weight

[0024] Titanium dioxide (Beijing Chemical Plant) 40 parts by weight

[0025] γ-(3-Acetylacetonyl)propyltrimethoxysilane (self-made) 1 part by weight

[0026] 1% gamma-(3-acetylacetonate) propyltrimethoxysilane ethanol solution was applied on the surface of 304# stainless steel and dried. After standing at room temperature for 24 hours, the stainless steel test piece was bonded with the above-mentioned silicone rubber. Place it at room temperature for 7 days to fully cure the silicone rubber. The shear strength test results are as follows:

[0027] Shear Strength Failure Mode

[0028] 2.95MPa coh...

Embodiment 2

[0041] Prepare silicone rubber according to the following formula:

[0042] 107 raw silicon rubber (Beijing Chemical Plant) 100 parts by weight

[0043] Ethyl Tetrasilicate (Beijing Xinzhong Chemical Factory) 3 parts by weight

[0044] Dibutyltin dilaurate (Beijing Chemical Plant) 0.4 parts by weight

[0045] No. 2 white carbon black (Shenyang Chemical Plant) 10 parts by weight

[0046] Titanium dioxide (Beijing Chemical Plant) 40 parts by weight

[0047] γ-(3-Acetylacetonyl)propyltrimethoxysilane (self-made) 1-5 parts by weight

[0048] The brass test piece was bonded with the above-mentioned silicone rubber. Place at room temperature for 24h, and treat at 100°C for 6h. The shear strength test results are as follows:

[0049] γ-(3-Acetylacetonyl)propyltri

[0050] 0 1 3 5

[0051] Methoxysilane content (weight points)

[0052] Shear strength (MPa) <0.5 2.46 2.79 2.83

[0053] Failure mode Adhesive failure Cohesive failure Cohesive failu...

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Abstract

A silicon- rubber composition comprises crude silica gel, cross linking agent, catalyst, filling material and gamma-(3-acetylacetone) propyl trialkoxy silicane, these components are blended at room temperature (25-40 deg. C.). The composition can be used for the adhesion with metals.

Description

technical field [0001] The invention relates to a silicone rubber composition and its preparation method and application. The composition is composed of silica gel, crosslinking agent, catalyst, filler and gamma-(3-acetylacetonyl)propyltrialkoxysilane. The composition is prepared by blending the above components at room temperature (25-40° C.). The composition can be used for bonding with metals. Background technique [0002] Silicone rubber has high and low temperature resistance, weather aging resistance and excellent electrical properties, and is an important bonding and sealing material. Silicone rubber is widely used in construction, transportation and electronic devices in modern industry. However, due to the low surface energy of silicone rubber, its bonding strength with metal surfaces, especially difficult-to-bond metals such as stainless steel and brass, is also very low, which affects the service life of many bonded and sealed parts. Therefore, it is of great ...

Claims

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Application Information

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IPC IPC(8): C08K5/5415C08L83/00
Inventor 姚远余云照
Owner INST OF CHEM CHINESE ACAD OF SCI
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