Single-component dealcoholization type RTV (room temperature vulcanization) organopolysiloxane composition

An organopolysiloxane, room temperature vulcanization technology, applied in the direction of adhesive additives, non-polymer adhesive additives, adhesives, etc., can solve the problems of difficult processing and poor storage stability, and achieve easy operation, easy processing, and easy The effect of industrialization

Active Publication Date: 2019-07-12
YANTAI DARBOND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The traditional one-component condensation RTV silica gel uses hydroxyl-terminated polydimethylsiloxane (commonly known as 107 glue) as the matrix polymer, which has the problem of difficult processing at the peak of viscosity and poor storage stability.

Method used

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  • Single-component dealcoholization type RTV (room temperature vulcanization) organopolysiloxane composition
  • Single-component dealcoholization type RTV (room temperature vulcanization) organopolysiloxane composition
  • Single-component dealcoholization type RTV (room temperature vulcanization) organopolysiloxane composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Double-ended alkoxy-terminated polydimethylsiloxane

[0028] Under inert gas conditions, add 100 g of double-ended vinyl polydimethylsiloxane with a viscosity of 1000 mPa.s (vinyl content is 0.32%) and 0.6 g of a commercially available platinum catalyst with a Pt content of 3000 ppm to the reactor Pt-3000, stir evenly, and keep warm at 40°C for 1 hour, then slowly add 1.95g of triethoxysilane dropwise to it, after the dropwise addition, keep warm at 120°C for 3h to get colorless and transparent Two-terminal alkoxy-terminated polydimethylsiloxane A with the same two-terminal functional groups.

Embodiment 2

[0029] Example 2 Double-ended alkoxy-terminated polydimethylsiloxane

[0030] Under inert gas conditions, add 200 g of double-ended vinyl polydimethylsiloxane with a viscosity of 100,000 mPa.s (vinyl content of 0.06%) and 0.01 g of commercially available carboxy with a Pt content of 20% to the reactor. Stirr catalyst, stirred evenly, and kept at 50°C for 0.5 h, then slowly added dropwise a mixture of 0.56g of hydrogen-containing alkoxysilane I and 0.53g of hydrogen-containing alkoxysilane II, after the dropwise addition, Insulated and reacted at 80°C for 6 hours, a colorless and transparent two-terminal alkoxy-terminated polydimethylsiloxane B with different functional groups at both ends was obtained. The infrared spectrum is shown in figure 1 , IR results show that the alkoxy-terminated polydimethylsiloxane prepared by this method has no Si-OH.

Embodiment 3

[0031] Example 3 Single-ended alkoxy-terminated polydimethylsiloxane

[0032] Under inert gas conditions, add 150 g of single-ended vinyl polydimethylsiloxane with a viscosity of 20,000 mPa.s (vinyl content is 0.05%) and 0.15 g of a commercially available platinum catalyst with a Pt content of 5,000 ppm to the reactor Pt-5000, stirred evenly, and reacted at 60°C for 0.5 h, then slowly added 0.39g of trimethoxysilane dropwise to it, after the dropwise addition, kept at 100°C for 5h to obtain trifunctional mono Alkoxy-terminated polydimethylsiloxane C.

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Abstract

The invention relates to single-component dealcoholization type RTV (room temperature vulcanization) organopolysiloxane composition. The single-component dealcoholization type RTV organopolysiloxane composition is prepared from components in parts by weight as follows: 100 parts of double-end alkoxy-terminated polydimethylsiloxane, 0-30 parts of single-end alkoxy-terminated polydimethylsiloxane, 0-30 parts of dimethyl silicone oil, 2-30 parts of fumed silica, 0.5-2 parts of a water absorbent, 3-15 parts of a cross-linking agent, 0.2-3 parts of a silane coupling agent and 0.1-3 parts of a catalyst. According to the single-component dealcoholization type RTV organopolysiloxane composition, single-end and double-end alkoxy-terminated polydimethylsiloxane is adopted to replace glue 107 to serve as base polymer, peak viscosity cannot appear during processing, and the composition has the characteristic of being easy to process; meanwhile, a preparation method of single-end and double-end alkoxy-terminated polydimethylsiloxane adopts a hydrosilylation mode, introduction of Si-OH in the system is eliminated, and particularly, by introduction of single-end alkoxy-terminated polydimethylsiloxane, excellent storage stability of a single-component product is guaranteed.

Description

technical field [0001] The invention relates to a one-component dealcoholized room temperature vulcanized organopolysiloxane composition and a preparation method thereof, in particular to a one-component dealcoholized room temperature vulcanized organopolysiloxane for electronic coating and potting The composition and its preparation method belong to the field of organic synthesis. Background technique [0002] Due to its excellent performance, organosilicon room temperature vulcanizing silica gel has achieved rapid development in recent decades and has been widely used in various fields of the national economy. Among them, the one-component condensation type RTV silica gel is cured by the moisture in the air, which has the advantages of convenient operation, no heat release during the curing process, excellent aging resistance, energy saving and environmental protection, etc., and its development is particularly rapid. One-component dealcoholized silica gel produces methan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/04C09J11/04C09J11/06C08G77/38
CPCC08G77/38C08L2205/025C08L2205/03C09J11/04C09J11/06C09J183/04C08L83/04C08K3/36C08K5/544C08K13/02
Inventor 姜云王建斌陈田安
Owner YANTAI DARBOND TECH
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