Composition for sealing electrical connectors

 

(57) Abstract:

The invention relates to the field of compositions intended for sealing electrical connectors between the contacts and the insulator. The composition has the following ratio of components, wt.h.: amoxicillinpurchase resin CADM-2 90-110, low molecular weight polyamide resin L-20 40-60 and hexagonal boron nitride 80-100. The composition provides sealing electrical connectors between the contacts and the insulator with differing thermal coefficients of linear expansion, working in conditions of thermal Cycling exposure to temperatures from -60°C to +85°C with simultaneous protection of contacts for soldering and painting. table 2.

The invention relates to the field of compositions intended for sealing electrical connectors between the contacts and the insulator, and can be used in the radio industry, instrumentation, aviation industry.

In modern technique for sealing electrical connectors (e.g., plug connectors) known sealants and compounds based on silicone rubbers: “Sealers-68”, “Sealers PC-68”, 1-18, etc., and LM is URS”].

The disadvantages of silicone sealants and compounds is their poor adhesion ability and the low mechanical strength (0,35 0,2...) MPa, which does not provide reliable protection contacts during subsequent coating and is not recommended for use in combination with unprotected copper and its alloys.

Tokelove sealants cause darkening of copper, brass, silver and ethnologica in use: have a long curing time (7 days at a temperature of 25±10°C or 25±10°C for 24 hours, and then at a temperature of 70±10°C for 24 hours).

Closest to the technical nature of the proposed composition for sealing electrical connectors is glue W-25-200-based silicone resin (dry residue of not less than 98.5% of the epoxy groups of not less than 14%, silicon not less than 5%) [OST 4 TH.054.210-83 “Bonding metallic and nonmetallic materials, part 1].

Glue W - 25-200 has the following composition, wt.h.:

Resin CADM-2 (OST6-06-448-95) 100

The low molecular weight resin, polyamide L-20

(TU-360-09201-208-96) 50

The hexagonal boron nitride 60

(TU2-036-707-77)

However, the adhesive penetrates into the gaps between the contacts and izostericheskie connectors. Misused glue in large thicknesses (>250 µm) due to the internal stress does not stand the test cycle at a temperature of from -60°C to +85°C (3 cycles) and cracking. The tightness between the contacts and the insulator is broken. The viability of glue - 1 hour, which is not enough.

The technical object of the present invention is to provide a composition for sealing electrical connectors, providing sealing of electrical connectors between the contacts and the insulator with different coefficients of linear expansion, working in conditions of thermal Cycling exposure to temperatures from -60°C to +85°C with simultaneous protection of contacts for soldering and coating and increase vitality.

The solution of the problem is due to the fact that the composition for sealing electrical connectors based on amoxicillinpurchase resin of SEDM-2, low molecular weight polyamide resin L-20 and hexagonal boron nitride is characterized by the fact that the composition has the following ratio of components, wt.h.:

Resin CADM-2 (OST6-06-448-95) 90-110

The low molecular weight resin, polyamide L-20

(TU-360-09201-208-96) 40-60

Nor is the shadow, in table.2 - their properties.

The proposed composition for sealing electrical connectors at the stated ratio of the components provides a sealed electrical connectors between the contacts and the insulator with different coefficients of linear expansion, working in conditions of thermal Cycling exposure to temperatures from -60°C to +85°C with simultaneous protection of contacts for soldering and coating and increase vitality.

The results of comparative tests of analogue and claimed composition for sealing electrical connectors for connectors, consisting of materials having different coefficients of linear expansion (for example, brass and plastic), are given in table.2.

As can be seen from the data table.2, the proposed composition for sealing electrical connectors has a number of advantages:

- greater vitality (3 hours versus 1 hour);

- it is resistant to thermal Cycling to temperatures from -60°C to +85°C (more than 3 cycles against “cracking”);

- protects the contacts for soldering against “does not provide”).

Create a composition provides sealing electrical connectors between ilichevskogo exposure to temperatures from -60°C to +85°C with simultaneous protection of contacts for soldering and painting.

Composition for sealing electrical connectors, including amoxicillinpurchase the resin CADM-2, low molecular weight polyamide resin L-20 and hexagonal boron nitride, characterized in that the composition has the following ratio of components, wt.h.:

Resin CADM-2 90 - 110

The low molecular weight resin, polyamide L-20 40 - 60

The hexagonal boron nitride 80 - 100

 

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