SU595346A1 - Oligoorganovinylsiloxane-base composition - Google Patents

Description

one

The invention relates to the field of compositions based on oligoorganic vinyl siloxane, which can be used in sealing electronic and electronic equipment, in particular for integrated circuits.

A composition based on oligoorganovinylsiloxane, oligoorganosiloxane and polyaddition catalyst - platinum hydrochloric acid 1 is known.

A disadvantage of the known composition is low adhesion and elasticity, as well as a short shelf life.

The purpose of the invention is to increase the elasticity and adhesion to the surface.

This is achieved due to the fact that as a catalyst for the addition of a composition contains silicone peroxide selected from the group;

t / er-butylperoxytrimethylsilane, di-trigbutyldimethyldiperoxysilane, di-warmed-butyl diperoxytetramethyldisiloxane, in the following ratio of components, weight. h: Oligoorganovinylsiloxane100

Oligo-organosiloxane1-20

Organosilicon peroxide 3-10

As oligoorganic vinyl siloxane, the composition contains polydimethylvinylsiloxane with a viscosity of 1000-2000 c and contains 0.1 - 1 mol. % vinyl groups, and polydimethylhydridyl siloxane with a viscosity of 500-1500 cn, containing 5-12 mol. % hydride groups. The composition is prepared as follows.

Mix the appropriate amounts of oligoorganovinylsiloxane, oligoorganosiloxane and polyaddition catalyst, and vacuum them until air bubbles disappear for at least 30 minutes.

The shelf life of the composition in a sealed container is not limited at room temperature. Upon contact with air, hydrolytic decomposition of the initiating additive occurs due to moisture.

The prepared composition is applied to the protected surface and polymerized at temperatures of 170-210 ° C for 2-5 hours. After preliminary protection using the proposed composition, the product is subjected to final sealing in a plastic, metal, ceramic body.

Example 1. 100 wt. including polydimethylmethylvinylsiloxane (I) with 1 weight. including polydimethylmethylsiloxane (II) and 3 weight. including tert.butylperoxytrimethylsilane (III) is stirred, evacuated. The polymerization is carried out at 200 ° C for 4 hours.

i:

..r.t.- V-.

Example 2. Analogously to example 1, components I, II and III in the ratio of weight. hours equal to 100: 10: 5 mix, vacuum. Polymerization is carried out at 200 ° C for 3 h.

Example 3, In tax example 1, the components are 1:11: III in a weight ratio. hours equal to 100: 20: 10 mix, vacuum. The polymerization is carried out at 170 ° C for 2 hours.

Example 4. 00 weight. including polydimethylmethyl iviylsiloxane (I) with 1 weight. including yolidimethylhydrosyloxa (II) and 3 wt. including di-treg-butyldimethyldipyroxysilane (IV) is stirred and vacuum. The polymerization is carried out at 200 ° C for 5 hours.

Example 5. Analogously to example 4, the same components, I, II and IV in the ratio of weight. hours equal to 100: 15: 6 mix, vacuum. The polymerization is carried out at 180 ° C for 5 hours.

Physico-mechanical characteristics of the compositions

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Example 6. Analogously to example 4, the same components I, And and IV in the ratio of weight. hours equal to 100: 20: 10 mix, vacuum. The polymerization is carried out at a temperature of 170 ° C for 3 hours.

Example 7. 100 weight. Part I, 1 wt. Part II and 3 wt. h. V, mix and vacuum. The polymerization is carried out at 200 ° C for 5 hours.

Example 8. Analogously to example 7, the same components I, II and V in the ratio of weight. hours equal to 100: 13: 5,5 move, vacuum. The polymerization is carried out at 200 ° C for 3 hours.

Example 9. Analogously to example 7, the same components I, II and V in the ratio of weight. hours equal to 100: 20: 10 move, vacuum. The polymerization is carried out at 170 ° C for 3 hours.

The properties of the compositions of example 1-9 are shown in the table.

Thus, from the table it can be seen that the proposed composition allows to achieve high adhesion to the surface of the protected product and a higher elasticity, which

Claims (1)

allows you to reduce waste in the manufacture of devices with the same technological scheme of protection of products. 5 The claims of the composition based on oligoorganic vinyl siloxane, oligoorganic siloxane and polyaddition catalyst are distinguished by the fact that, in order to increase elasticity and adhesion to the surface, as a catalyst and olyadine, it contains organosilicon peroxide selected from the group: t /) e butylperoxytrime-10 tilsilane, di-treg-butyldimethyldipyroxysilane, di-gret-butyldiperoxytetramethyldisy6loksan in the following ratio of components, weight. including: Oligoorganovinylsiloxane 100 Oligoorganohydride siloxane 1-20 Silicon peroxide 3-10 Sources of information taken into account during the examination 1. USSR author's certificate No. 176421, cl. B 32B 27/04, 1965.