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

A room temperature curing, optically transparent technology, applied in chemical instruments and methods, other chemical processes, etc., to achieve the effects of cost reduction, simple process, and improved optical transparency

Inactive Publication Date: 2004-03-17
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

[0030] Under normal temperature and vacuum conditions, first mix 100 parts of hydroxyl-terminated polydimethylsiloxane and 6 parts of methyltriacetoxysilane at a speed of 100 rpm for 15 minutes, and then dry at 120 ° C for 6 The specific surface area of ​​20 parts after hours is 200m 2 / g of fumed silicon dioxide is added, and after stirring and mixing at a speed of 800 rpm in a high-speed mixer for 30 minutes, add 30 parts of dimethylpolysiloxane and 40 parts of liquid paraffin, and reduce the stirring speed at 200 rpm Stir and mix for 25 minutes per minute to obtain a transparent room temperature curing organic silicone sealing mixture.

Embodiment 2

[0032] Under normal temperature and vacuum conditions, 80 parts of hydroxyl-terminated polydimethylsiloxane and 4.8 parts of methyltriacetoxysilane were stirred and mixed for 15 minutes at a speed of 100 rpm, and then dried at 120 ° C for 6 The specific surface area of ​​16 parts after hours is 400m 2 / g fumed silica is added, the silica adopts surface-treated hydrophobic fumed silica, after stirring and mixing for 15 minutes at a speed of 1200 rpm in a high-speed mixer, add dimethyl polysiloxane 18 parts of oxane and 32 parts of phenyl silicone oil were mixed at 300 rpm for 15 minutes at a reduced stirring speed to obtain a transparent room temperature curing organic silicone sealing mixture.

Embodiment 3

[0034] Under normal temperature and vacuum conditions, first mix 100 parts of hydroxyl-terminated polydimethylsiloxane and 8 parts of methyltriacetoxysilane at a speed of 100 rpm for 15 minutes, and then dry at 120 ° C for 6 The specific surface area of ​​5 parts after hours is 600m 2 Wet-process hydrophobic (Wet-process hydrophobic) prepared hydrophobic silicon dioxide per g was added, after stirring and mixing at a speed of 1000 rpm in a high-speed mixer for 20 minutes, 40 parts of dimethyl polysiloxane and liquid paraffin were added 53 parts of the 100:50 mixture of 108 oil, reduce the stirring speed at 250 rpm and stir and mix for 20 minutes to obtain a transparent room temperature curing organic silicone sealing mixture.

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PUM

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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 the silicone sealing mixture (also known as silicone sealant) can maintain a certain fluidity within 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 aging resistance, ozone resistance, electrical insulation and elasticity, and thus are widely used in construction, automobile, electronic appliances and other industries. However, the tensile strength of the silicone sealing compound not filled with reinforcing materials is very low, only 0.35Mpa, so it is generally necessary to add appropriate fillers to improve the tensile pr...

Claims

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Application Information

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Patent Type & Authority Applications(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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