Protective-adhesive lacquer for inhibiting solid-propellant charge

FIELD: chemistry.

SUBSTANCE: invention relates to rocket engineering, particularly to production of a protective-adhesive lacquer which is used as a primer for binding an inhibiting coating with the surface of the charge when inhibiting solid-propellant charge. The protective-adhesive lacquer contains 4,4',4"-triphenylmethane triisocyanate, dichloroethane, as an adhesive additive - a product of polycondensation of ethylene glycol, adipic acid and glycerine, with content of hydroxyl groups from 2.00 to 2.30 wt % and dibutyltin dilaurate as a curing agent.

EFFECT: obtaining lacquer with high capacity for protection from migration processes in the "fuel-inhibiting coating" system, which reduces smoke formation, increases adhesion strength between the inhibiting coating and the surface of the propellant charge, which contains polyformaldehyde derivative-based components, avoids use of an additional cellulose acetate-based primer, which ensures strong adhesion of solid-propellant charge pellets with the inhibiting coating for the guaranteed storage life of the charge and which enables to use readily available domestic raw materials.

1 tbl

 

The invention relates to the field of rocket technology, namely the development of a protective and adhesive lacquer to ensure a lasting bond Bonaparte with the surface of the fuel pieces and can be used in the development and manufacture of a charge of solid propellant (TRT).

Design supplementary charges from ballistic solid fuels, armored on certain surfaces, widely used in rocket technology, particularly for engines of active-reactive systems (ARS), anti-tank guided missiles (pturs) and other

The creation of precision-guided missiles, including the most modern methods of targeting (laser and beam) is complicated by the low reliability of the transmission of commands on Board the projectile in the presence of significant smoke route of flight.

The main sources of smoke at work managed rockets are products of combustion of solid rocket fuel and Bonaparte.

Currently booking charges ptors and ARS are widely used Bonaparte on the basis of cellulose acetate having a low power smoke. During long-term storage charges due to migration of plasticizer - nitroglycerin in Bonaparte decreases thermal stability of ultrafine cellulose acetate Bonaparte, the zoom is by the power of smoke, there is a change in the chemical composition of the fuel and Bonaparte. To reduce migration nitroethanol of fuel in Bonaparte, fuel is applied to the protective adhesive lacquer.

Known protective adhesive sublayer patent RU No. 2217460 stated 23.07.2001, published 27.11.2003,, IPC C09D 175/00 for booking charge TRT, consisting of a 20% solution of 4,4',4"-triphenyltetrazolium in dichloroethane, and as an adhesive additive is injected to it allyl alcohol in the amount of 0.5-2%. The sublayer is cured on the surface of the fuel checkers at a temperature of from 15°to 35 ° C under the action of ORGANOTIN catalyst for the 0.75 to 6.0 hours. The composition selected by the authors as a prototype of the proposed invention. However, in the process of manufacturing charges with the use of a protective and adhesive sublayer at the specified patent identified the following disadvantages:

- when booking charges of fuels containing components derived polyformaldehyde requires the application of additional sublayer on the basis of cellulose acetate, as derivatives of polyformaldehyde significantly reduce the adhesion of ultrafine cellulose acetate Bonaparte fuel through the known protective adhesive sublayer;

- due to objective reasons, the domestic production of allyl alcohol is missing;

- allyl alcohol having aetsa toxic product, belongs to the first class of danger by MAC.

Also known protective adhesive sublayer under the patent RU №2280054 declared 14.02.2005, published 20.07.2006,, IPC C09D 175/00, consisting of a 20% solution of 4,4',4"-triphenyltetrazolium in dichloroethane, and as an adhesive additive contains monomethacrylate ether of ethylene glycol. Monomethacrylate ether of ethylene glycol is the product of chemically not stable and after the warranty period of storage (6 months) not suitable for further use. Also, at this time the release of its domestic industry is paused.

With the aim of enhancing domestic resource base to ensure the manufacturing charges of solid rocket fuel, the necessity arose to develop a new protective adhesive varnish.

The technical objective of the proposed invention is the development of a protective and adhesive lacquer to ensure a lasting bond the pieces of the TRT with Bonapartism with high protective ability of the migration processes in the system "fuel-Bonaparte"contributing to the reduction of smoke in the process, solid rocket motor that eliminates the use of additional sublayer on the basis of cellulose acetate when booking products with a low burning rate.

The technical result is achieved due to the fact that the protective adhesive varnish for booking TRT on the basis of 4,4,4"-triphenyltetrazolium, dichloroethane, as the adhesion of the additive contains a polycondensation product of ethylene glycol, adipic acid and of glycerol content of hydroxyl groups of from 2.00 to 2.30 wt.%, and as a catalyst for curing the lacquer is entered dibutyltindilaurate.

The proposed varnish allows you to securely fasten Bonaparte with the surface of the fuel charge, containing in its composition-based components derived polyformaldehyde and thus avoid the use of additional sublayer on the basis of cellulose acetate ("HELL"), and also reduces the diffusion of nitrofuran of fuel in Bonaparte during long-term storage of charges, thereby reducing power of smoke in the process, solid rocket motor. Additionally, the polycondensation product of ethylene glycol with adipic acid and glycerol content of hydroxyl groups of from 2.00 to 2.30 wt.%, is low-toxic product compared to allyl alcohol, and is also widely used in fastening adhesives in the manufacture of Bonaparte for various solid rocket motor systems.

Technology of preparation of the proposed varnish, applying it to the fuel block and the drying mode, similar to the prototype and does not require a process and apparatus for modifying the process of booking charges by casting under pressure.

In the table given the s examples of formulations intended varnish, its adhesion, migration and technological properties.

Table
Namethe placeholderThe estimated compositions, examples No.
indicators1234567
The composition of the sublayer, %,
- 4,'4,'4" triphenyltetrazolium19,55-19,8519,6519,6519,7519,8019,8519,9019,90
- dichloroethane78,4-79,878,3079,80 78,6078,7078,9579,5079,6
- allyl alcohol0,5-2,0-------
- a polycondensation product of ethylene glycol, adipic acid and of glycerol content of hydroxyl groups of from 2.00 to 2.30, wt.%-2,00,51,51,01,00,50,4
- dibutyltindilaurateof 0.05-0.20,050,050,150,50,2ml0,1
The adhesion strength of Bonaparte to solid rocket fuel, kgf/cm2,
- high63,1-68,4Adhesion is missing68,769,070,3to 70.268,848,1
with a lower burning rate64,0-66,5*Adhesion is missing68,068,369,469,768,242,6
The content of nitrofuran in bonapartei after storage for 30 days. for charges of high-energy fuel, %,
at 20°C0,54-0,7-0,400,430,410,42 0,45-
at 60°C2,38-2,96-2,152,422,232,342,6-

Continuation of the table
Indicesthe placeholderThe estimated compositions, examples No.
1234567
The content of nitrofuran in bonapartei after storage for 30 days. for charges of fuel with a low burning rate, %,
at 20°C0,4-0,6 -0,280,260,320,310,24-
at 60°C5,9-7,4-4,24,34,54,34,0-
Power smoke after accelerated aging of the charges at the test temperature 50°C m2/s
- high-energy fuel0,8-1,8-0,8-1,21,0-1,40,7-1,10,7-1,20,9-1,3-
fuel with a low burning rate1,2-2,1-1.3 to 1.71,4-1,8/td> 1,0-1,31.1 to 1.41,1-1,6-
* Products with an additional sublayer based on the "AC"

From the table it is seen that the adhesion strength of Bonaparte to solid rocket fuel increased to 70,3 kg/cm2(example 4), the content of nitrofuran in bonapartei after prolonged storage at temperatures above 20°C and + 60°C decreased to 0.4 and 2.5% (example 1), and output of the smoke after accelerated aging armored charges with the proposed protective adhesive varnish was reduced to 0.7 and 1.0% (example 4). In addition it should be noted that the adhesion strength of the proposed Lac example (2-6) fuel with a low burning rate and contain components based on the derivatives of polyformaldehyde higher than that of the prototype and this prevents the application of additional sublayer on the basis of "AC". With the introduction of the protective adhesive lacquer polycondensation product of ethylene glycol, adipic acid and of glycerol content of hydroxyl groups of from 2.00 to 2.30, wt.% in the amount of 2.0 wt.% (example 1) - adhesion is missing, because of the rapid curing of the varnish on the surface of the fuel checkers, which is 0.1-0.2 hour. With the introduction of 0.4 wt % (example 7), adhese is significantly reduced, as the varnish for a long time (more than 6 hours) are not cures on the surface of the fuel checkers. In this regard, examples 1 and 7 technologically unacceptable when booking products and further research with these examples have not been conducted. In addition to manufacturing, we offer protective adhesive varnish is used available raw materials domestic production.

The proposed protective adhesive lacquer tested with a positive result in the manufacture of full-scale payment products and conduct their bench tests in the conditions of the FSUE "December".

Protective adhesive varnish for booking charge of solid propellant containing 4,4',4" triphenyltetrazolium, dichloroethane, curing catalyst, dibutyltindilaurate and adhesive additive, characterized in that the adhesion of the additive contains a polycondensation product of ethylene glycol, adipic acid and of glycerol content of hydroxyl groups of from 2.00 to 2.30 wt.%, in the following ratio, wt.%:

4,4',4" Triphenyltetrazolium19,65-19,90
Dichloroethane78,60-79,80
A polycondensation product of ethylene glycol,
adipic acid and of glycerol content
hydroxyl groups from 2.00 to 2.30, wt.%0.5 to 1.5
Dibutyltindilaurate0,05-0,50



 

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18 cl, 4 tbl, 7 ex

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18 cl, 4 tbl, 7 ex

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15 cl, 2 tbl, 4 ex

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2 tbl

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EFFECT: high efficiency of coating manufacturing, higher reliability and durability of a coating, possibility to manufacture a double-layer coating with damping properties.

8 cl

FIELD: chemistry.

SUBSTANCE: formulation composition contains: A) 5-95 wt % at least one radiation-curable resin, B) 5-25 wt % silicic acid, C) 0.1-10 wt % at least one adhesion promoter, D) 5-90 wt % at least one radiation-curable reactive diluent, E) 0.5-5 wt % at least one dispersant. The adhesion promoter is selected form phosphoric acid and/or phosphonic acid and/or products of reaction thereof with functionalised acrylates. The composition can additionally contain photoinitiators, pigments and additives, selected from diffusion promoting agents, delustering agents and degassing agents. The compositions are used as a primer, an intermediate layer, coating varnish and/or clear varnish, as well as for making coatings via a coil coating technique.

EFFECT: coatings have flexibility, thereby providing excellent protection of metal substrates from corrosion.

18 cl, 2 tbl, 6 ex

FIELD: chemistry.

SUBSTANCE: invention relates to a self-crosslinking binder for coating compositions containing an aqueously dispersed polymer component A having at least one carbonyl group of the ketone or aldehyde type per molecule, and a component B having at least two hydrazine or hydrazide groups per molecule, and at least one structural unit -NR1-NR2-CHR3-CHR4-NH-R5 (I), where the radicals R1, R2, R3 and R4 are each individually selected from a group consisting of a hydrogen radical and a linear or branched alkyl radical having from 1 to 10 carbon atoms, R3 and R4 may additionally be selected from a group consisting of aryl and alkylaryl radicals having from 6 to 15 carbon atoms, and from oxyalkyl radicals with 1 to 10 carbon atoms, where oxy groups may be inserted into the alkyl chain or at the end of an alkyl chain, and R5 is selected from a group consisting of a hydrogen radical, alkyl radicals which may be linear, branched or cyclic and may have from 1 to 10 carbon atoms, and residues of formula -(CH2)n-CO-O-X, where n is an integer of from 1 to 6, and X is a residue of a polyatomic alcohol or phenol. A method of producing such a binder is also described.

EFFECT: producing a coating binder which is self-crosslinking when drying, having fast drying properties and improved chemical resistance and weather resistance.

17 cl, 5 ex, 5 tbl

FIELD: construction.

SUBSTANCE: invention represents an emulsion, in which oligomers with terminal isocyanate groups are a dispersion medium, and a disperse phase is a solution or a dispersion produced as a result of mixing a lime solution with calcium hydroxide content of 10-70 wt % with glycerine in the amount of 1-250 wt parts per 100 wt parts of calcium hydroxide, besides, the disperse phase content in the composition makes 1-55 wt %.

EFFECT: development of a cheap and easy to apply composition, coatings from which have high adhesion to moist metal or concrete surfaces, have proper adhesion to concrete applied onto them, are hardened with specified speed at temperature from zero and above, inhibit processes of metal corrosion and have low elasticity module.

1 tbl

FIELD: chemistry.

SUBSTANCE: coating has surface tension less than 20 mN/m, wherein the coating material used is hydrolysis-resistance lacquers, and where the hydrolysis-resistant lacquers are selected from a group consisting of polyurethanes, acryl and silicones, where the coating has a random topography with roughness of less than 500 nm, preferably less than 300 nm.

EFFECT: coating prevents deposit of bacteria and improves thermal conduction of the coated material.

19 cl, 4 dwg, 2 ex

FIELD: optical engineering.

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EFFECT: increased rupture strength and reduced light loss.

2 cl, 1 tbl, 8 ex

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