Epoxy caulking compound

 

(57) Abstract:

Epoxy caulking compound may be used as self-extinguishing sealing compounds for impregnation radio electrical goods, in particular for casting high-voltage devices, such as transformers, ignition coils. The compound contains aluminum hydroxide, pentabromodiphenylether, Antifoam, PGCO-1001", "Epoxide C-1281", trichloropropane, tetraethoxysilane, a mixture of isomers of diaminodiphenylmethane and epoxy Dianova resin ED-20. The combination of components in a certain ratio provides improved viscosity, electrodiagnostic and Flammability. 3 table.

The invention relates to the production of self-extinguishing sealing compounds based on epoxy resins and can be used for impregnation of electrical goods, in particular for casting high-voltage devices, such as transformers, ignition coils.

Known insulating impregnating and casting compound containing epoxy Dianova resin, filler - melkodispersnye hydrate of aluminum oxide, hardener - isomethyltetrahydrophthalic Ango composition and properties of the present invention is an epoxy molding compound, containing, in wt.h: epoxy Dianova resin ED-20 (90,0-100,0), fine aluminum hydroxide as filler (100,0-130,0), hardener - isomethyltetrahydrophthalic anhydride (78,0-90,0), silicone antifoam - epoxypropoxyphenyl (0,8-1,2), solvent - hexabromobenzene (20,0-40,0), accelerator - benzimidazole (0,8-1,2), the flame retardant is antimony trioxide (10,0-20,0) and the adduct of maleic anhydride with vinyltriethoxysilane (0,8-1,2) (A. with. The USSR 1451149, CL 08 L 63/02, 1989).

A disadvantage of known composition is the toxic component of antimony trioxide, which belongs to class II hazard and contains impurities - toxic (arsenic up to 0,09%) and a negative effect on the dielectric strength of the compound (iron and 0.04%).

The challenge which seeks the invention is the improvement of qualitative characteristics of the compound and the expansion of raw materials for its receipt.

This task is solved in that the epoxy molding compound containing epoxy Dianova resin ED-20, fine aluminum hydroxide as filler, hardener, thinner, silicone antifoam and the flame retardant, as a hardener contains compounds which TBE flame retardant - a mixture of pentabromophenoxy and trichloropropane, as a diluent for the tetraethoxysilane and Epoxide C-1281 as plasticizing agents, in the following ratio, wt.%:

Aluminium hydroxide - 26,0-40,0

The antifoam of PGCO-1001 - 0,2-0,5

The mixture of isomers of diaminodiphenylmethane - 6,0-9,0

Pentabromophenoxy - 4,0-7,0

Trichloropropylphosphate - 3,0-6,0

The tetraethoxysilane - 1,0-3,0

Epoxide WITH 1281 - 13,0-17,0

Epoxy Dianova resin ED-20 - Rest

The compound was prepared as follows and in the following modes.

Initially prepare the base: epoxy Dianova resin ED-20 is heated to 60-80oWith, mixed with dried fine aluminum hydroxide and molten pentabromodiphenylether in capacity, equipped with stirrer, then enter trichlorpropane and the Antifoam PGCO-1001". The mixture was incubated for 3-5 h at 60-80oC in vacuum with stirring.

In the ready the basis of introducing tetraethoxysilane and Epoxide C-1281, mix, and then vacuum at a residual pressure of 10-15 mm RT. Art. at 60oC for 40-60 minutes In the mixture enter the estimated amount of the molten mixture of isomers of diaminodiphenylmethane and re is

In table.1 shows the variations of the compound, prepared for tests.

Silicone antifoam, PGCO-1001 TU 6-00-05763441-64-92 made on the basis of liquid polymethylsiloxane.

Epoxide-1281 THE 6-22-232-85 made on the basis of a mixture of alkylphenolethoxylate, 1-3-dialkylphenols esters of glycerol and the source of the ALKYLPHENOLS.

The compound was tested for strength according to GOST 64.33.3-71 on the device UFO 829-4010 and Flammability according to GOST 21207-81. These indicators are essential to assess the suitability of the compound.

For testing the strength were prepared three batches of samples (10 each alternative composition) diameter 500,5 mm for tests for Flammability - three party (3 of each option).

In table.2 shows the test results of the proposed compound in comparison with commercially available under the name "Compound brand ASPS" and used for sealing the diode flyback transformers (YOU.028.115 TU).

In table.3 shows a comparative qualitative characteristics of the proposed compound and compound ASPS.

From the above table.2 and 3 one can see that the proposed composition has the best performance in CPA the values and Flammability (decrease in the length of the charred parts). This allows you to use the compound at elevated temperatures (up to 120oC), for example, for sealing ignition coils, designed for use in 12-volt contactless ignition system. The decrease in viscosity contributes to a better spreading of the compound for the sealing of products, providing the best impregnation of windings of the coils.

Epoxy caulking compound containing epoxy Dianova resin ED-20, fine aluminum hydroxide as filler, hardener, thinner, silicone antifoam and the flame retardant, characterized in that it contains as a curing agent mixture of isomers of diaminodiphenylmethane as diluent - tetraethoxysilane, as silicone antifoam a Defoamer, PGCO-1001, as a flame retardant is a mixture of pentabromophenoxy and trichloropropane and advanced Epoxide C-1281 - as plasticizing agents, in the following ratio, wt.%:

Aluminium hydroxide - 26,0-40,0

The antifoam of PGCO-1001 - 0,2-0,5

The mixture of isomers of diaminodiphenylmethane - 6,0-9,0

Pentabromophenoxy - 4,0-7,0

Trichloropropylphosphate - 3,0-6,0

The tetraethoxysilane - 1,0-3,0

E is

 

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