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Gas-emission-reduced silicone gel

A technology of silicone gel and organosiloxane, applied in the field of silicone gel to reduce gas emissions

Pending Publication Date: 2021-08-24
ELANTAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, at temperatures above 150°C, these silicone gels are subject to oxidative degradation, leading in the case of methyl-containing siloxane polymers to the emission of gases including carbon monoxide and formaldehyde

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0266] 1985.42 parts (weight) of divinyl polydimethylsiloxane (component A) with a viscosity of 2000mPa·s, 13.5 parts (weight) of polydimethylsiloxane containing 7mmol / g Si-H content (Component B), 0.08 parts (weight) 3,5-dimethyl-1-hexyn-3-ol (component D), 1 part (weight) of 1% Karstedt complex (component C) A solution of 1,2-divinyltetramethyldisiloxane (component D) and a mixture of 10 parts by weight of iron-doped pyrogenic titanium dioxide (component E) were thoroughly mixed. The mixture was then crosslinked at 206°C for 72 hours. During storage, the penetration hardness and lost mass were determined at 206°C.

[0267] figure 1 The mass loss in % during storage at 206° C. for inventive example 1 and comparative example 1 (ordinate) is plotted against the storage time in days (abscissa). The mass loss at time x is based on the mass at time 0, i.e. the moment when storage begins at 206 °C, and is calculated as follows:

[0268] Mass loss % (moment x) =

[0269] (mass(...

Embodiment 2

[0276] 1985.42 parts (weight) of divinyl polydimethylsiloxane (component A) with a viscosity of 2000mPa·s, 13.5 parts (weight) of polydimethylsiloxane containing 7mmol / g Si-H content (Component B), 0.08 parts (by weight) of 3,5-dimethyl-1-hexyn-3-ol (component D), 1 part (by weight) of 1% Karstedt complex (component C) A solution of 1,2-divinyltetramethyldisiloxane (component D) and a mixture of 20 parts by weight of iron-doped pyrogenic titanium dioxide (component E) were mixed thoroughly. The mixture was then crosslinked at 206°C for 72 hours. During storage, the penetration hardness was determined at 206°C.

Embodiment 3

[0278] 1985.42 parts (weight) of divinyl polydimethylsiloxane (component A) with a viscosity of 2000mPa·s, 13.5 parts (weight) of polydimethylsiloxane containing 7mmol / g Si-H content (Component B), 0.08 parts (by weight) of 3,5-dimethyl-1-hexyn-3-ol (component D), 1 part (by weight) of 1% Karstedt complex (component C) A solution of 1,2-divinyltetramethyldisiloxane (component D) and a mixture of 30 parts by weight of iron-doped pyrogenic titanium dioxide (component E) were mixed thoroughly. The mixture was then crosslinked at 206°C for 72 hours. During storage, the penetration hardness was determined at 206°C.

[0279] image 3 The penetration depth in mm (ordinate) is plotted for inventive examples 1 to 3 during storage at 206° C. against the storage time in hours (abscissa).

[0280] from image 3 It can be seen that there is an ideal concentration of iron-doped pyrolytic titania. If this value is exceeded, oxidative degradation increases and hardness increases. This b...

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Abstract

The invention relates to compositions which contain polyorganosiloxanes, a hydrosilylation catalyst, an inhibitor or moderator and doped pyrogenic titanium dioxide, to the use thereof for applying protective coatings to an electrical or electronic component or device and to the protective coatings as such.

Description

technical field [0001] The present invention relates to compositions comprising polyorganosiloxanes, hydrosilylation catalysts, inhibitors or regulators and doped fumed titanium dioxide and to the use of these compositions for the application of protective coatings to electrical or electronic components or devices and The protective coating itself. Background technique [0002] The existence of silicone gels has long been known, which includes polyorganosiloxanes containing alkenyl groups, such as vinyl-terminated polydimethylsiloxane, which also includes polyorganohydridosiloxanes and hydrosilanes Catalyst crosslinking is used. [0003] However, at temperatures above 150° C., these silicone gels are subject to oxidative degradation, leading in the case of methyl-containing siloxane polymers to the emission of gases comprising carbon monoxide and formaldehyde. [0004] US 5,571,853 describes a silicone gel for the protection of electrical and electronic components which ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/07C09D183/05C09D7/61
CPCC08G77/12C08G77/20C08K2003/2241C01G23/07C01P2002/54C01P2004/64C01P2006/11C01P2006/12B01J31/1608B01J2231/323B01J2531/828C09D183/04C08L83/00C08K5/56C08K9/02C08L83/04
Inventor 安德烈亚斯·施泰因曼
Owner ELANTAS
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