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A kind of thixotropic silicone rubber, its preparation method and its application

A technology of silicone rubber and thixotropy, which is applied in the direction of electrical components, circuits, semiconductor devices, etc., can solve the problems of affecting LED luminous efficiency, increasing thixotropic index, and decreasing light transmittance, achieving high thixotropy and thixotropic index High, simple method and effect

Active Publication Date: 2017-07-07
BEIJING KMT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the amount of thixotropic materials increases, the thixotropic index increases and the light transmittance also decreases, which affects the luminous efficiency of LEDs, thus limiting the application of the above materials.

Method used

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  • A kind of thixotropic silicone rubber, its preparation method and its application
  • A kind of thixotropic silicone rubber, its preparation method and its application
  • A kind of thixotropic silicone rubber, its preparation method and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a 2L reactor, add in order: 10000mPa.s vinyl silicone oil with 0.12% vinyl content, 1000g, 35g hydrogen-containing silicone oil with a viscosity of 100mPa.s and 0.3% hydrogen content, 0.7g ethynyl cyclohexanol, Karstedt platinum catalyst 3ppm, hydrophilic fumed silica (Degussa A300) 50g, vinyltriethoxysilane 10g. Then stir and mix at room temperature (25° C.) for 3 hours to prepare the silicone rubber in the present invention. The silicone rubber has a light transmittance of 55% and a thixotropic index of 3.79. See Table 1 for the data.

Embodiment 2

[0033] In a 2L reactor, add in order: 10000mPa.s vinyl silicone oil with 0.12% vinyl content, 1000g, 35g hydrogen-containing silicone oil with a viscosity of 100mPa.s and 0.3% hydrogen content, 0.7g ethynyl cyclohexanol, Karstedt platinum catalyst 3ppm, hydrophilic fumed silica (Degussa A300) 50g, vinyltriethoxysilane 5g, dimethyldimethoxysilane 5g. Then stir and mix at room temperature for 3 hours to prepare the silicone rubber in the present invention. The silicone rubber has a light transmittance of 52% and a thixotropic index of 3.88. See Table 1 for the data.

Embodiment 3

[0035]In a 2L reactor, add in order: 10000mPa.s vinyl silicone oil with 0.12% vinyl content, 1000g, 35g hydrogen-containing silicone oil with a viscosity of 100mPa.s and 0.3% hydrogen content, 0.7g ethynyl cyclohexanol, Karstedt platinum catalyst 3ppm, hydrophobic fumed silica (Degussa R812) 50g, γ-methacryloxypropyltrimethoxysilane 10g. Then stir and mix at room temperature for 3 hours to prepare the silicone rubber in the present invention. The silicone rubber has a light transmittance of 50% and a thixotropic index of 5.85. See Table 1 for the data.

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Abstract

The invention discloses thixotropic silicone rubber, which is prepared from vinyl silicone oil, hydrogen-containing silicone oil, an inhibitor, a catalyst, a thixotropic agent and a coupling agent. The silicone rubber has good transparency, relatively high thixotropy and the like. The invention also relates to preparation and application of the thixotropic silicone rubber.

Description

technical field [0001] The invention belongs to the field of silicone rubber, in particular to a thixotropic silicone rubber. The present invention also relates to the preparation method and application of the above-mentioned silicone rubber. Background technique [0002] Light Emitting Diode, referred to as LED (Light Emitting Diode), is a kind of electroluminescent solid-state device. It is called "green lighting source". Today's LED applications are extremely extensive, status display, sign lighting, LCD backlight, traffic signs, graphic display full-color screens, and indoor lighting that requires point or surface light sources are all LED application markets. [0003] Generally, materials for LED packaging mainly include epoxy resin, polymethyl methacrylate, thermosetting epoxy resin, and optical nylon. With the increase of LED power and brightness, these materials are prone to yellowing due to poor heat resistance. Changes, leading to light decay, unable to meet the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05H01L33/56
Inventor 李振忠刘慧娟
Owner BEIJING KMT TECH
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