High temperature resistant, two component, low viscosity silicone composition

A composition and two-component technology, applied in mechanical equipment, engine components, engine sealing, etc., can solve problems such as difficult application of sealing surfaces, lack of tolerance, viscosity of curable organosiloxane compositions, etc. , to achieve the effect of good tolerance and good adhesion

Active Publication Date: 2018-03-27
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Curable organosiloxane compositions can be very viscous and difficult to apply to sealing surfaces
Some curabl

Method used

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  • High temperature resistant, two component, low viscosity silicone composition
  • High temperature resistant, two component, low viscosity silicone composition
  • High temperature resistant, two component, low viscosity silicone composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] Preparation of 1-A

[0081] Element

[0082] 1 Hydroxy-terminated PDMS

[0083] 2 Silbond 8000TST

[0084] 3 Zeothix 95

[0085] Example 1-A was prepared as follows. Add cristobalite powder, colorant, hexamethyldisilazane, and most of the organosiloxane polymer to the mixer. The ingredients were mixed at high speed and heated to 100°C for 30 minutes. Heat and vacuum strip (strip) for 30 minutes. Let cool to room temperature. The remaining ingredients were added and mixed under vacuum for 30 minutes while maintaining the batch temperature below 50°C. The final Part A composition has a viscosity of about 40,000-50,000 cP.

[0086] Preparation of 1-B

[0087] Element

[0088] 1 Methyl-terminated PDMS

[0089] 2 Aerosil R8200

[0090] 3 Silbond 8000TST

[0091] 4 LM400

[0092] 5 AMMOs

[0093] 6 UL 38

[0094] Example 1-B was prepared as follows. Add plasticizer, cristobalite powder and fumed silica to the mixer. Mix at high speed and he...

Embodiment 2

[0105] Preparation of 2-A

[0106] Element

weight%

organosiloxane polymer 1

77.4

Fumed silica, surface treated 2

15

carbon black filler

2.5

Precipitated silica 3

3.6

iron oxide black

1.5

[0107] 1 Hydroxy-terminated PDMS

[0108] 2 Aerosil R8200

[0109] 3 Zeothix 95

example 2-A

[0110] Example 2-A was prepared as follows. Fumed silica, iron oxide powder, colorant, hexamethyldisilazane and most of the organosiloxane polymer were added to the mixer. The ingredients were mixed at high speed and heated to 100°C for 30 minutes. Heat and vacuum strip for 30 minutes. Let cool to room temperature. The remaining ingredients were added and mixed under vacuum for 30 minutes while maintaining the batch temperature below 50°C. The final Part A composition has a viscosity of about 45,000-55,000 cP.

[0111] Preparation of 2-B

[0112] Element

[0113] 1 Methyl-terminated PDMS

[0114] 2 Aerosil R8200

[0115] 3 LM400

[0116] 4 AMMOs

[0117] 5 UL 38

[0118] Example 2-B was prepared as follows. Add plasticizer, quartz filler and fumed silica to the mixer. Mix at high speed and heat to 100°C under vacuum for 30 minutes. Let cool to room temperature. Add the oxime crosslinker and mix under vacuum for 5 minutes. Add the adhesion promoter and m...

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Abstract

A two part curable composition comprising organosiloxane polymer; water; an organosilane such as hexamethyldisilazane (HMDS) or vinyltrimethoxysilane; crosslinker; adhesion promoter and catalyst; andoptionally comprising plasticizer; colorant and filler. The first part can comprise organosiloxane polymer and water. The second part can comprise crosslinker; adhesion promoter and catalyst. Either or both parts can optionally further comprise an organosilane such as hexamethyldisilazane (HMDS) or vinyltrimethoxysilane; plasticizer; colorant and filler. The mixed parts have a low viscosity allowing injection under low pressure. Cured reaction products of the two part curable organosiloxane composition has good adhesion to metallic sealing surfaces and good resistance engine oil and other automotive fluids. Cured reaction products of the two part curable organosiloxane composition can surprisingly retain physical properties after long-term exposure to temperatures between 200 DEG C and 250DEG C and can retain physical properties after exposure to temperatures between 250 DEG C to 300 DEG C for short periods.

Description

technical field [0001] The present disclosure generally relates to two-part curable organosiloxane compositions having low viscosity and high temperature resistance. Background technique [0002] Small internal combustion engines are ubiquitous for use in lawn mowers, leaf blowers, generators, and the like. These engines typically have a block that surrounds and supports most of the moving engine parts. Other engine parts such as cylinders, cylinder caps, heads, intake manifolds, exhaust manifolds, etc. are attached to the block or to each other. A transmission or other unit may be attached to the engine to provide a drivetrain for some applications. Most small internal combustion engines rely on air cooling rather than fluids. These air-cooled engines can run at higher temperatures than liquid-cooled engines, and components on air-cooled engines can see higher operating temperatures than liquid-cooled engines. [0003] Many of the engines, transmissions, and other power...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L83/06C08K3/36C09K3/10
CPCC09K3/1018C08L83/04C08G77/16C08K5/5445C08K3/013C08K2003/085C08K3/04C08K3/36C08K3/34C08K5/5415C08K5/0016C08K2003/2265C08K5/5425C08K5/544C08K5/57C08L83/06F16J15/14C08G2190/00C08K3/08C08K3/22
Inventor C·维尔奥斯基S·拉瑙G·扎法罗尼
Owner HENKEL KGAA
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