Organic silicon foaming sheet for electronic product and preparation method thereof

A technology of foamed sheet and silicone, which is applied in the field of silicone foamed sheet for electronic products and its preparation, can solve problems such as the inability to prepare ultra-thin foamed sheet, and achieve excellent waterproof, shock-absorbing and sealing properties, Effects of excellent shock absorption performance, excellent flame retardancy and high temperature resistance

Active Publication Date: 2021-10-01
HUBEI XIANGYUAN NEW MATERIAL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, silicone foam is mainly used in rail transit and new energy battery industries, and its thickness is basically 2mm or more. Its formula, matching equipment and preparation process cannot produce ultra-thin foam sheet suitable for electronic products.

Method used

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  • Organic silicon foaming sheet for electronic product and preparation method thereof
  • Organic silicon foaming sheet for electronic product and preparation method thereof
  • Organic silicon foaming sheet for electronic product and preparation method thereof

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preparation example Construction

[0041] In some embodiments of the present invention, a method for preparing the silicone foam sheet is also provided, comprising the following steps:

[0042] (1) Mix the entire amount of the component (B), component (D), and component (H) with half of the amount of the component (A) with a non-interventional homogenizer to obtain the first combination Object A;

[0043] (2) The other half of the amount of component (C), component (E), component (F), component (G), component (I) and the other half of the amount of component (A) is not The intervening homogenizer is mixed to obtain the second composition B;

[0044] (3) Keep the first composition A and the second composition B at a constant temperature in a planetary mixer (heat is generated during the stirring process, cool with a mold temperature machine, and maintain the temperature at 30°C to 40°C), and stir under reduced pressure for 5 minutes to obtain silicone resin composition.

[0045] The present invention prepares...

Embodiment 1

[0052] 50 parts by mass of vinyl molar ratio (the ratio of the amount of vinyl to the amount of siloxane chain link) is 0.16% vinyl-terminated polysiloxane, 10 parts by mass of vinyl molar ratio is 5% Polyvinyl polysiloxane, 5 parts by mass The specific surface area of ​​surface treatment with hexamethyldisilazane is 160m 2 Fumed white carbon black (R8200, commercially available product) and 1 mass part of castor catalyst (platinum metal content: about 5000ppm) in / g were mixed with a non-interventional homogenizer for 8min to obtain component A;

[0053] 50 parts by mass of vinyl molar ratio (the ratio of the amount of vinyl to the amount of siloxane chain link) is 0.16% vinyl-terminated polysiloxane, 3.30 parts by mass of silicon hydrogen group content is 1.6wt% The side chain of polysiloxane containing silylhydrogen group (make the number of moles of hydrogen atoms bonded to silicon atoms in the polysiloxane of side chain containing silylhydrogen group relative to the termi...

Embodiment 2

[0056] 50 parts by mass of vinyl molar ratio (ratio of the amount of vinyl material to the amount of material of siloxane chain link) is 0.32% vinyl-terminated polysiloxane, 3 parts by mass vinyl molar ratio is 22% Polyvinyl polysiloxane, 5 parts by mass, surface-treated with hexamethylenedisilazane, has a specific surface area of ​​300m 2 / g of fumed white carbon black, 1 mass part of castor catalyst (platinum metal content: about 5000ppm) was mixed with a non-intervention homogenizer for 8min to obtain component A;

[0057] 50 parts by mass of vinyl molar ratio (the ratio of the amount of vinyl to the amount of siloxane chain link) is 0.32% vinyl-terminated polysiloxane, 4.72 parts by mass of silicon hydrogen group content is 1.6wt% The side chain of polysiloxane containing silylhydrogen group (make the number of moles of hydrogen atoms bonded to silicon atoms in the polysiloxane of side chain containing silylhydrogen group relative to the terminal vinyl polysiloxane and pol...

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Abstract

The invention belongs to the field of waterproof damping sealing materials, and particularly relates to an organic silicon foaming sheet for an electronic product and a preparation method thereof. The thickness of the organic silicon foaming sheet is 50-2000 microns, the organic silicon foaming sheet is of a closed-cell structure, and the closed-cell rate is 92% or above; the average cell diameter of the organic silicon foaming sheet is 16-40 [mu] m, and the cell diameter of more than 90% of all cells in the organic silicon foaming sheet is less than 70 [mu] m. The organic silicon foaming sheet can show excellent damping performance, can show a stable loss factor tan delta in a wide temperature range of -40 DEG C to 180 DEG C, and has relatively low compression set in the temperature range; meanwhile, the organic silicon foaming sheet has excellent waterproof sealing performance and flame retardant performance, and is very suitable for waterproof damping sealing of electronic products.

Description

technical field [0001] The invention belongs to the field of waterproof and shock-absorbing sealing materials, and more specifically relates to a silicone foam sheet for electronic products and a preparation method thereof. Background technique [0002] The existing waterproof and shock-absorbing sealing materials for consumer electronics are mainly ultra-thin IXPE foam, which has excellent sealing and waterproof performance and good shock-absorbing performance, but has extremely poor flame retardancy and poor high and low temperature resistance. As the thickness of the equipment becomes thinner and the data processing capability of the equipment becomes higher and higher, the power of the equipment increases and the heat generated increases, which in turn affects the resistance of the waterproof and shock-absorbing sealing materials used inside the equipment. The requirements for flammability and high temperature resistance are getting higher and higher. [0003] Compared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K7/26C08K3/22C08K3/34C08K3/40C08K13/04C08K9/06C08K13/06C08J9/32C08J5/18
CPCC08J9/32C08J9/0095C08J9/009C08J9/0066C08J9/0061C08J5/18C08J2383/07C08J2483/07C08J2483/05C08K2003/2227C08K2003/2224C08K2003/2296C08K7/26C08K3/34C08K3/40C08K13/04C08K9/06C08K13/06C08J2203/22
Inventor 方凯魏琼
Owner HUBEI XIANGYUAN NEW MATERIAL TECH INC
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