RU2750222C2 - Solid propellant fuel charge - Google Patents

Abstract

FIELD: fuels.

SUBSTANCE: invention relates to the area of development of solid propellant fuel charges and can be used as an armouring adhesive coating of highly filled polymer compounds (energy condensed systems) and as filling compounds in electronics, electrical and radio engineering, construction. A charge of solid propellant fuel made in form of a block, armoured along the outer surface with an armouring coating with a thickness of 1.5 to 5 mm. A composition based on polyether urethane rubber with end epoxyurethane groups (PPG-3A), epoxy resins based on 4,4'-dioxyphenylpropane with a molecular weight of 340 to 600 (ED-20) and a dehydrochlorination product of dehydrochlorohydrins obtained through condensation of epichlorohydrin with water under the action of an acidic catalyst (UP-655) is used as a polymer coating. A stabilised liquid mixture of aromatic amines is used as a curing agent, a mixture of ammonium polyphosphate and a mineral filler is used as a filler, diatomic phenol is used as a hardening accelerator. The composition therein contains epoxyurethane rubber PPG-3A 80 to 120 mass parts, epoxy resin ED-20 40-60 pts. wt., epoxy resin UP-655 50 to 70 pts. wt., mineral filler 10 to 170 pts. wt., ammonium polyphosphate 10 to 100 pts. wt., aromatic hardener 20 to 40 pts. wt., hardening accelerator 3 to 10 pts. wt.

EFFECT: technical result is increased deformation properties in the temperature range of 60°C below zero to 60°C above zero and a lower glass transition point.

1 cl, 3 tbl

Description

The invention relates to the field of development of charges of solid rocket fuel and can be used as a protective adhesive coating for highly filled polymer compositions (energy condensed systems), as well as potting compounds in electronics, electrical and radio engineering, in construction and other purposes.

Known charge of ballistic propellant with armor, adhesive coating based on epoxyurethane resin, hardener and filler, described in patent RU 2275521 C1 from 27.04.2006, The disadvantage of the charge is the use of an armor coating with a high glass transition temperature, which does not allow exploitation of charges in low temperature conditions due to cracking of the polymer coating.

The technical objective of the invention is to create a charge with an armor coating of accelerated curing, having a low glass transition temperature and high deformation properties in a wide temperature range from -60 to 60 ° C.

The task is achieved by obtaining a charge with an armor coating with a thickness of 1.5 to 5 mm, which uses polyester urethane rubber with end epoxyurethane groups (PPG-3A), epoxy resins based on 4,4'-dioxydiphenylpropane with a molecular weight of 340 to 600 ( ED-20) and on the basis of the dehydrochlorination product of dehydrochlorins obtained by condensation of epichlorohydrin with water under the action of an acid catalyst (UP-655), the hardener is a stabilized liquid mixture of aromatic amines, the filler is a mixture of a mineral filler and ammonium polyphosphate and the curing accelerator is diatomic phenol in the following ratio components by weight: 80-120 rubber PPG-3A; 40-60 epoxy resin ED-20; 50-70 epoxy resin UP-655; 10-170 mineral filler; 10-100 ammonium polyphosphate; 20-40 hardener; 3-10 curing accelerator.

The claimed charge with an accelerated curing armor coating with a low glass transition temperature and increased deformation characteristics provides operational characteristics and operability in a wide temperature range from -60 to + 60 ° C in comparison with the known solution.

This is confirmed by examples.

Example 1

Obtaining an armor coating and a charge based on it using a polymer composition in which an epoxyurethane rubber with end epoxyurethane groups and a curing accelerator diatomic phenol are introduced.

Getting a double mix

In a reactor equipped with a heating and a stirrer, load epoxy resin UP-655, obtained by hydrolysis of epichlorohydrin in the presence of a catalyst with an epoxy number of 21 (C) and resorcinol (D) in a ratio of 70: 7, raise the temperature to 60 ° C and with a running stirrer with the number of revolutions of at least 60 rpm is stirred for 20 minutes.

The double mixture is poured into a metal container and cooled to 20 ° C.

The parameters for obtaining double mixtures according to examples 2-8 are shown in table 1

Example 2

Obtaining a polymer coating and a charge based on it

In another reactor, equipped with a vacuum system, load 33.0 mass. including double mixture, after which 30 mass is sequentially introduced. including epoxyurethane rubber with epoxyurethane groups PPG-3A, 60 wt. including epoxy resin ED-20, 15 wt. including mineral filler, 80 mass. including ammonium polyphosphate and 20 wt.h. a liquid eutectic mixture of 1,3-phenylenediamine, 4,4'-diaminodiphenylmethane and technical p-aminobenzylaniline in a ratio of 30:30:40. The composition is stirred at a temperature of 35 ° C with the included vacuum.

To obtain a charge, a blank checker, representing a monolithic cylinder of solid rocket fuel, is placed in a metal mold, on which an anti-adhesive coating based on an organosilicon liquid 136-41 in nefras is preliminarily applied and cured at a temperature of 120 ° C for 8 hours by supplying steam to the jacket forms. The gap between the form and the block is 3 mm. The composition is poured into the gap between the metal mold and the block and kept at a temperature of 60 ° C by supplying hot water to the mold jacket for 4 hours. After turning off the heating, the armor-coated charge is cooled to room temperature, removed from the mold, rejected and sent for acceptance tests.

Examples 2-8 are carried out in a similar manner under the conditions shown in table 2.

The properties of polymer coatings obtained using the composition in which the polyether urethane rubber is introduced in comparison with the prototype are shown in Table 3.

As can be seen from the above table, the claimed charge with a polymer coating, which uses a polymer composition with polyurethane rubber, has significant advantages over the known technical solution.

Claims (2)

A solid propellant charge, made in the form of a checker, armored on the outer surface with an armor coating, with a thickness of 1.5 to 5 mm, characterized in that a composition based on polyester urethane rubber with end epoxyurethane groups (PPG-3A) is used as a polymer coating, epoxy resins based on 4,4'-dioxyphenylpropane with a molecular weight of 340 to 600 (ED-20) and the dehydrochlorination product of dehydrochlorohydrins obtained by condensation of epichlorohydrin with water under the action of an acid catalyst (UP-655); a stabilized liquid mixture of aromatic amines, as a filler - a mixture of ammonium polyphosphate and a mineral filler, as a curing accelerator - diatomic phenol, while the composition contains in mass parts: Rubber PPG-3A 80-120 Epoxy resin ED-20 40-60 Epoxy resin UP-655 50-70 Mineral filler 10-170 Ammonium polyphosphate 10-100 Aromatic hardener 20-40 Curing accelerator 3-10