High-flame-retardant organic silicon foam sheet and preparation method thereof

Abstract

The invention discloses a high-flame-retardant organic silicon foam sheet. The foam sheet is prepared from the following raw materials: a halogen-free flame retardant, vinyl-terminated polysiloxane, a polysiloxane coupling agent with a side chain containing a silicon-hydrogen group, a catalyst, an inhibitor, polysiloxane with a side chain containing a silicon-hydrogen group, a foaming agent and a reinforcing filler. In the high-flame-retardant organic silicon foam sheet, inorganic flame retardant particles are uniformly dispersed and serve as physical cross-linking points, so that the cross-linking density of organic silicon foam is greatly improved; and the inorganic flame retardant particles serve as bubble nucleation centers during foaming at the same time, so that generated foam pores are more uniform in size and distribution, and the buffering performance, the tearing strength, the pressure change performance and the elongation of the organic silicon foam are greatly improved. The organic silicon foam has the advantages of being excellent in buffering performance, high in tearing strength, large in elongation, good in pressure change performance and excellent in flame retardant performance, the flame retardant performance reaches the UL942.5mm V0 grade, and the organic silicon foam is quite suitable for vibration buffering and sealing of a lithium ion power battery pack of a new energy automobile.

Description

technical field [0001] The invention belongs to the field of high flame-retardant and slow-vibration sealing materials, and more specifically relates to a high flame-retardant organic silicon foam sheet and a preparation method thereof. Background technique [0002] Lithium-ion power battery packs generally require a better thermal management system. Between the batteries in the battery pack (typically Panasonic 18650 batteries used by Tesla), gaps are reserved during design as air ducts or liquid cooling channels. Polyurethane foam, liquid silicone rubber, silicone foam and other materials are generally used as vibration damping sealing materials between the battery core and the battery core, and between the battery core and the shell. These materials play the role of vibration damping and sealing of the battery core. If the battery core falls off due to vibration, it is easy to cause battery power failure, short circuit, overload, resulting in sudden stop, combustion, ex...

AI Technical Summary

Problems solved by technology

However, the general silicone foam material often has poor tear resistance and pressure change performance, which is not conducive to sealing and long-term use as a buffer; or poor flame retardancy, which cannot meet the requirements of lithium batteries.

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