RU2263577C1 - Method of armoring of charges made out of a ballistite solid rocket propellant - Google Patents

Abstract

FIELD: methods of production of armoring of solid fuel charges made out of a ballistite solid rocket propellants.

SUBSTANCE: the invention is pertaining to the field of production of armoring of solid fuel charges made out of ballistite solid rocket propellants. The method provides for application of the adhesive underlayer on a propellant grain, its placement in a mould and injection of the heated up to a yield state of the armoring composition in the clearance between the mould and the propellant grain. After solidification of the armoring composition the surface of the armoring coating is treated with a 3 % solution surfactant in an acetone with drying at the temperature of 15... 35°C during no less than 10 minutes, then apply by a dipping the surface screening film layer of a composition, which includes "Leikonat" adhesive (triphenylmethaneizocyonate) - 70 mass %, dibutylstannumacetate propionate - 0.2...0.4 ass %, acetone - the rest. The technical solution ensures a high manufacturability of manufacture of the charges with the reduced smoke formation.

EFFECT: the invention ensures a high manufacturability of manufacture of the charges with the reduced smoke formation.

3 cl, 1 dwg, 1 tbl

Description

The invention relates to the field of booking charges from ballistic solid rocket propellants (TRT) and can be used in the development and manufacture of charges TRT.

Among the well-known methods of booking TPT charges, the most advanced are methods of booking fast-curing thermoplastic armored personnel by injection molding in injection molds and injection molding machines (TPA) according to patents: US 3642961 A, 02.15.1972; RU 2209135, July 27, 2003. These methods make it possible to reserve charges with thermoplastic armored compounds based on cellulose acetate (Pat. RU 2179989, February 27, 2002) and, by applying a shielding film layer based on Leikonat glue to the reserved surface of cellulose acetate armor, provide reduced smoke generation of charges (US Pat. RU 2164616, 03/27/2001).

However, in the absence of regulated application modes of the shielding layer, it is not always possible to ensure the quality of its application to the surface of the armor coating and, therefore, it is guaranteed to achieve the final result - low smoke formation of the TRT charges.

The technical task of the patented invention is the development of a method of applying a shielding surface layer that provides high manufacturability of the manufacture of charges TRT with obtaining low smoke and high quality manufactured charges.

The specified technical problem is solved in the present invention by selecting the optimal formulation of the technological solution of the shielding layer based on glue "Leikonat" and the temperature-time modes of its application.

The invention is illustrated graphic materials.

Drawing. Patented reservation process diagram

1 - checker TRT;

2 - armored personnel;

3 - capacity;

4 - technological varnish solution based on glue "Leikonat";

5 - surface shielding film layer (PEPS);

L is the length of the armored portion of the charge;

N is the depth of dipping the pieces into the varnish solution.

The technical result of the invention consists (see drawing) in the reservation of the TPT checker (1) with a thermoplastic armored composition (2) based on cellulose acetate, including applying an adhesive sublayer to the fuel block, installing it in the mold and injecting the armor heated to a fluidity state in the gap between the press -form and a fuel bomb, curing the armor, surface treatment of the mold formed in the mold of the armored coating with a 3% solution of a surface-active substance (surfactant) in acetone, followed by drying for at least 10 minutes at a temperature of 15 ... 35 ° C, dipping the fuel checkers in the varnish solution (4) located in the container (3), which includes Leykonat glue - 70 wt.%, dibutyltin acetate propionate - 0.2 ... 0.4 wt. %; acetone - the rest, after polymerization of which a shielding film layer forms on the surface of the armor coating (5). In this case, dipping a charge into a varnish solution is carried out to a depth of: H = L, where L is the length of the armored portion of the charge. It is recommended to use OP-7, OP-10 substances (products of the interaction of mono- and dialkylphenols with ethylene oxide) as surfactants. The formulation of the technological varnish solution adopted in the patented method, in terms of the content of the Leikonat adhesive, ensures its satisfactory spreadability over the surface of the armor coating (taking into account the pre-treatment of surfactants). In terms of hardener content (dibutyltin acetate acetate), the lower limit (0.2%) is the polymerization period acceptable for factory mass production of charges, and the upper limit (0.4%) is the acceptable durability of the varnish solution (acceptable "density" when applied by dipping).

Application options for the shielding layer are shown in the table.

A positive effect of the invention is the high quality of the booked charges, providing reduced smoke generation.

The method has been practically tested in industrial production in the manufacture of TRT charges from 4 grades of ballistic compositions armored with cellulose acetate cellulose on TPA.

Claims (2)

1. The method of booking charges from ballistic solid rocket fuel with thermoplastic cellulose-based thermoplastic armored compounds, comprising applying an adhesive sublayer to the fuel block, installing it in the mold and injecting the armored mixture heated to a state of fluidity in the gap between the mold and the fuel block, characterized in that after the curing of the bronze composition the surface of the armored coating is treated with a 3% solution of a surfactant in acetone with drying at a temperature of 15 ... 35 ° C for at least 10 minutes, the last which are applied by dipping a surface shielding film layer composition comprising adhesive "Leikonat" (trifenilmetanizotsionat) - 70 wt%, dibutilolovoatsetatpropionat -. 0.2 ... 0.4 wt% acetone -. else. 2. The method of booking charges according to claim 1, characterized in that the surface-active substances are used commercially available substances OP-7, OP-10.