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Nonisocyanate-cured azide polyether binder system and propellant

A non-isocyanate and azide polyether technology, applied in explosives and other fields, can solve the problems of unreasonable rigid structure network crosslinking structure, poor mechanical properties, low mechanical properties, etc., achieve stable and controllable charge quality, and solve thermal problems. Stress problem, the effect of excellent mechanical properties

Active Publication Date: 2019-12-20
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polytriazole systems based on GAP adhesives reported at home and abroad generally have the problem of low mechanical properties. The rigid structure of the triazole ring on the side chain and the network cross-linking structure constructed are unreasonable, so the mechanical properties are poor and the elongation is generally low

Method used

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  • Nonisocyanate-cured azide polyether binder system and propellant
  • Nonisocyanate-cured azide polyether binder system and propellant
  • Nonisocyanate-cured azide polyether binder system and propellant

Examples

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preparation example Construction

[0054] In an optional embodiment, the preparation method of the alkynyl-terminated polyether comprises the following steps:

[0055] (1): Dissolve the hydroxyl-terminated polyether in an organic solvent, and add an alkali metal hydride into the hydroxyl-terminated polyether solution under the protection of an inert gas, wherein the molar percentage range of the hydroxyl-terminated polyether and the alkali metal hydride is 1 :2~1:3;

[0056] Wherein, the organic solvent can be tetrahydrofuran, acetone, ethanol, etc., preferably tetrahydrofuran; the alkali metal hydride can be sodium hydride, potassium hydride, lithium hydride, etc., preferably sodium hydride;

[0057] (2): React the mixed solution obtained in step (1) at 20-40°C for 3h-5h;

[0058] (3): The system after the reaction in step (2) is cooled to 0-10°C, and after the temperature is balanced, propyne bromide is added dropwise in proportion, wherein the molar percentage of propyne bromide and alkali metal hydride is ...

Embodiment 1

[0074] (1) Preparation of alkynyl-terminated polyether:

[0075] (a) Dissolving PEG (Mn=700) in tetrahydrofuran to obtain a solution, adding sodium hydride to the solution in a nitrogen atmosphere in proportion, wherein the molar percentage of PEG and sodium hydride is 1:2;

[0076] (b) Move the mixed solution obtained in step (a) into a constant temperature reaction bath at 30° C., and the reaction time is 4 hours;

[0077] (c) The reactant obtained in step (b) is moved into an ice-water bath, and after the temperature is balanced, propyne bromide is added dropwise in proportion, and the molar ratio of propyne bromide to sodium hydride is 1:1.5;

[0078] (d) Seal the reactant obtained in step (c) with nitrogen gas, and move the reaction system into a temperature environment of 20°C, and continue to react at 20°C for 48h;

[0079] (e) filtering the reactant obtained in step (d), and evaporating the THF solvent to dryness to obtain the crude product of the alkynyl-terminated p...

Embodiment 2

[0091] (1) Preparation of alkynyl-terminated polyether:

[0092] The preparation method is basically the same as in Example 1, except that the raw material used in step (a) is QJPEG (Mn=3500), and the final alkynyl-terminated polyether obtained is QJPEG (Mn=3500);

[0093] (2) Propellant formula composition (mass percent %):

[0094]

[0095] (3) Propellant performance:

[0096] Theoretical standard specific impulse: 2664.6N.s / kg (271.9s)

[0097] Mechanical properties: Maximum tensile strength σ at 20°C m =0.40MPa, maximum elongation ε m =143.2%

[0098] Maximum elongation at 70℃ε m=35.9%

[0099] -40℃maximum elongationε m = 39.6%

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Abstract

The invention relates to a nonisocyanate-cured azide polyether binder system and a propellant, and belongs to the technical field of solid propellants. The system includes the following components inparts by mass: 54% to 96.6% of a binder, 3.2% to 45.3% of a curing agent, and 0.2% to 1.5% of a curing catalyst, wherein the binder is glycidyl azide polymer (GAP), the curing agent is a bifunctionalor multifunctional alkynyl-terminated polyether, and the curing catalyst is at least one of nano copper powder and a cuprous salt. The propellant provided by the invention has higher curing reaction activity and a faster reaction speed, can be cured at normal temperature, and solves the problem of residual thermal stress of grain solidification; the reaction mechanism is not affected by moisture,and the affect of environmental humidity and the moisture of the raw materials on curing and mechanical properties can be eliminated; and the obtained propellant has excellent mechanical properties, especially has higher elongation, and the elongation can reach 100% or more and is much higher than a level of mechanical properties reported outside China.

Description

technical field [0001] The invention relates to a non-isocyanate-cured azide polyether adhesive system and a propellant, belonging to the technical field of solid propellants. Background technique [0002] Glycidyl azide polyether (GAP) binder has shown good performance in the fields of gas generating agents, explosives and propellants due to its advantages such as high heat of formation, high density, good stability, clean gas, and low characteristic signals. The application prospect has received extensive attention and in-depth research from all over the world. [0003] However, because the GAP adhesive molecule contains a large azidomethyl functional group side chain, and the hydroxyl group at the end of the molecular chain is a secondary hydroxyl group with low reactivity, the curing reaction process of the GAP propellant is more susceptible to moisture in the environment. Impact. First, water reacts with isocyanate to generate carbon dioxide, which causes holes and cr...

Claims

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Application Information

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IPC IPC(8): C06B45/10C08G65/337
CPCC06B45/105C08G65/337
Inventor 李伟唐泉杨品高王小英刘雄尹欣梅汪越
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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