Adhesive silicone composition and adhesion method using the same

A composition, silicone technology, applied in the direction of bonding method of adhesive heating, bonding method of surface pretreatment, adhesive, etc., can solve the problem of excessive crosslinking time, insufficient elongation performance and tensile strength And other issues

Active Publication Date: 2009-12-02
ELKEM SILICONES FRANCE SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the crosslinking time is still too long and the elongation properties and tensile strength are insufficient for this specific application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0216] Embodiment 1 (the present invention):

[0217] First, 30 parts by weight of polydimethylsiloxane (viscosity 20,000 mpa.s) terminated with dimethylvinylsiloxy units at each end, 13 parts by weight of fumed silica and 1 parts by weight of water mixed, the silica has 300m 2 / g of BET specific surface area, treated with 3.8 parts by weight of a mixture of hexamethyldisilazane in combination with divinyltetramethyldisilazane.

[0218] Then to the resulting mixture was added: 10 parts by weight of MDD Vi M Silicone copolymer gum with 720 ppm by weight of vinyl groups randomly distributed along the silicone chain, with a consistency of 600-900; 28 parts by weight at each end with dimethylvinylsiloxy units End-blocked polydimethylsiloxane with a viscosity of 100,000 mPa.s; 13 parts by weight of precipitated calcium carbonate with an average particle size of about 1.9 μm; 1.1 parts by weight of dimethyl Polysiloxane crosslinking agent (bi), viscosity is 9mPa.s; 0.6 parts by w...

Embodiment 2

[0220] Embodiment 2 (comparative example)

[0221] As a comparison, an adhesive composition similar to Example 1 was prepared, but without glue and with polydimethylsiloxane (viscosity 100,000 mpa.s) instead of the glue.

[0222] Characterization of Adhesives

[0223] a) Measuring performance

[0224] After the adhesive compositions had been degassed, they were used to prepare the test specimens required for measuring the dynamometric properties. For this purpose, 2 mm thick test pieces were prepared from the adhesive molded in a press at 150° C. under a pressure of 3 bar and crosslinked under these conditions for 15 minutes. After cross-linking, the samples were placed under laboratory conditions (25° C., 50% RH) for 16 hours before testing. Modulus, tensile strength, elongation at break (method according to standard ASTM D412) at 100%, 200% and 300% were measured.

[0225] Hardness (Shore A) was also measured according to standard ASTM D2240.

[0226] b) Adhesive force...

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Abstract

The present invention relates to a cross-linkable adhesive silicone composition, having a very short cross-linking time and capable of providing an adhesive having mechanical properties sufficient so that it can be used as an adhesive joint and provide waterproofing of a seam joining two substrates. The invention also relates to an adhesion method using the adhesive silicone composition. Such a composition comprises: (A) at least a polyorganosiloxane (POSA) having, for each molecule, at least two alcenyl groups, preferably, C2-C6 linked to silicon; (B) at least one polyorganosiloxane cross-linking agent having, for each molecule, at least two hydrogen atoms linked to silicon; (C) a catalytically efficient amount of at least one catalyst containing at least one metallic compound, preferably platinum; (D) a reinforcing mineral filler; and is characterized in that it also comprises at least one poluorganosiloxane (POS A') gum having a weight content of alcenyl(s) group(s), preferably vinyl(s), between 0.001% and 0.2%, and having a consistency of between 300 and 1200 at 25 DEG C.

Description

technical field [0001] The general field of the invention relates to silicone compositions crosslinkable by addition. The polyorganosiloxanes (POS) considered are of the cold-vulcanizable type (RTV), which are known conventionally in the form of two-component systems, the vulcanization of which can be accelerated by heat. [0002] More particularly, within the scope of the present invention are adhesive silicone compositions which crosslink by means of an addition reaction, wherein the kinetics of this reaction can be significantly increased by increasing the temperature. [0003] The invention also relates to a method for bonding at least two substrates using such a crosslinkable adhesive silicone composition. [0004] Within the scope of the present invention, this method applies more particularly to the production of inflatable bags for the protection of vehicle occupants, commonly referred to as "airbags". Background technique [0005] Traditionally, airbags are formed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J5/02C09J183/04B60R21/16C08L83/04
CPCC09J5/02B60R21/235C09J183/04B60R2021/2358C08L83/04C08L83/00C08L2666/16C09J5/06
Inventor L·迪蒙B·博尔德
Owner ELKEM SILICONES FRANCE SAS
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