Room-temperature vulcanized antiflaming single-component dealcoholization-type silicone rubber sealant and preparation method thereof

Abstract

The invention discloses a room-temperature vulcanized antiflaming single-component dealcoholization-type silicone rubber sealant and a preparation method thereof. The room-temperature vulcanized antiflaming single-component dealcoholization-type silicone rubber sealant comprises 40-60 parts of alpha, omega-divinyl polydimethylsiloxane (A), 5-15 parts of polydimethylsiloxane (B) the end group of which is hydrogen group, 1-5 parts of vinyltrimethoxysilane (C), 1-5 parts of platinum catalyst (D), 1-10 parts of gas phase method white carbon black (E), 15-30 parts of inorganic fire retardant (F), 5-10 parts of crosslinker (G), 2-8 parts of titanate catalyst (H), 1-5 parts of silane coupling agent (I) and 1-3 parts of hydroxyl and moisture scavenger (J). The preparation method comprises: evenly mixing components (A), (B) and (C) under the protection of N2; adding (D), reacting for 4 hours to finish blocking under the protection of N2; when the vacuum degree is more than -0.09, removing bubble for 10-30 minutes; successively adding components (F), (J) and (E); evenly mixing when the vacuum degree is more than -0.09; adding components (G), (H) and (I); and reacting for 30-60 minutes when the vacuum degree is more than -0.09.

Description

technical field [0001] The invention relates to a silicone rubber sealant and a preparation method, in particular to a room temperature vulcanized flame-retardant single-component dealcoholized silicone rubber sealant and a preparation method. Background technique [0002] At present, the flat panel display technology with Japan, South Korea, Taiwan and China as the main markets is developing rapidly. TFT-LCD will quickly occupy the audio-visual market, and the driving transformers matching the LCD display will begin to be produced in China. Since the output end of the driving transformer matching the LCD is high frequency and high voltage, it needs to be packaged with silica gel to increase the creepage distance, prevent breakdown, and play the role of insulation and moisture resistance. [0003] The output end of the drive transformer for liquid crystal displays is mainly sealed with room temperature vulcanized single-component dealcoholized silica gel. This type of silica...

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Problems solved by technology

Due to the halogen-free requirements of the electronics industry and the harmful gases released by halogen-based flame retardants during the flame-retardant process, the application of halogen-based flame retardants in the electronics industry is limited; and inorganic flame retardants need to be added in sealants. A large quantity can achieve a good flame retardant effect. Adding a large amount of inorganic flame retardants will increase the hardness of the sealant and reduce the mechanical properties. At the same time, adding a large amount of certain inorganic flame retardants, such as inorganic aluminum hydroxide, will seriously Affect the electrical properties of the sealant

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