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Optically transparent room temperature solidifying silicone mixture for sealing and process of preparation

A room temperature curing, optically transparent technology, applied in the direction of chemical instruments and methods, other chemical processes, etc., to achieve the effect of improving the refractive index, easy control, and improving optical transparency

Inactive Publication Date: 2005-03-30
SICHUAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide an optically transparent room temperature curing silicone sealing compound for the deficiencies of the existing one-component room temperature curing silicone sealing compound

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Under vacuum conditions at room temperature, 100 parts of hydroxy-terminated polydimethylsiloxane and 6 parts of methyltriacetoxysilane are stirred and mixed at a speed of 100 revolutions per minute for 15 minutes, and then dried at 120°C. The specific surface area of ​​20 parts after hours is 200m 2 / g of fumed silica was added. After mixing for 30 minutes at a speed of 800 revolutions per minute in a high-speed mixer, add 30 parts of dimethyl polysiloxane and 40 parts of liquid paraffin, and reduce the stirring speed to 200 revolutions. Stir and mix for 25 minutes per minute to obtain a transparent room temperature curing silicone sealing mixture.

Embodiment 2

[0033] Under vacuum conditions at room temperature, 80 parts of hydroxy-terminated polydimethylsiloxane and 4.8 parts of methyltriacetoxysilane were stirred and mixed at a speed of 100 revolutions per minute for 15 minutes, and then dried at 120°C. The specific surface area of ​​16 parts after hours is 400m 2 / g fumed silica is added. The silica uses surface-treated hydrophobic fumed silica. After mixing for 15 minutes at a speed of 1200 revolutions per minute in a high-speed mixer, add dimethyl polysilicon 18 parts of oxane and 32 parts of phenyl silicone oil, reduce the stirring speed and stir and mix at 300 rpm for 15 minutes, to obtain a transparent room temperature curing organosilicone sealing mixture.

Embodiment 3

[0035] Under vacuum conditions at room temperature, 100 parts of hydroxy-terminated polydimethylsiloxane and 8 parts of methyltriacetoxysilane were stirred and mixed at a speed of 100 revolutions per minute for 15 minutes, and then dried at 120°C. The specific surface area of ​​5 parts after hours is 600m 2 / g of wet process (Wet-process hydrophobic) to prepare hydrophobic silica and add it, stir and mix in a high-speed mixer at a speed of 1000 rpm for 20 minutes, then add 40 parts of dimethyl polysiloxane and liquid paraffin and 108 oil is 53 parts of the mixture at a ratio of 100:50, and the stirring speed is reduced at 250 rpm and mixed for 20 minutes to obtain a transparent room temperature curing silicone sealing mixture.

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Abstract

The present invention is one kind of room temperature cured sealing silicone mixture, which contains hydroxyl capped polydimethyl siloxane, crosslinking agent, silica, etc as well as characterized refractive index regulator. The present invention also relates to the preparation process of the sealing mixture. During its preparation, agglomerate silica grains are crushed via high speed stirring for dispersing in base material. Owing to the refractive index regulator, the mixture has high tensile strength and optical transparency. In addition, the mixture has low cost and simple and easy-to-control preparation process.

Description

1. Technical Field [0001] The invention belongs to the technical field of room temperature curing silicone sealing mixture and its preparation, and in particular relates to an optically transparent room temperature curing silicone sealing mixture and a preparation method thereof. 2. Background technology [0002] Since silicone sealing compound (also known as silicone sealant) can maintain a certain degree of fluidity in a wide molecular weight range, it is less affected by temperature, can be used in a variety of environments, and has excellent high and low temperature resistance after curing , Weather resistance, ozone resistance, electrical insulation and elasticity, so it is widely used in construction, automobiles, electronic appliances and other industries. However, the tensile strength of the silicone sealing compound that is not filled with reinforcing materials is very low, only 0.35Mpa, so it is generally necessary to add appropriate fillers to improve the tensile prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/06C09K3/10
Inventor 傅强彭娅王跃林王洪敏
Owner SICHUAN UNIV
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