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Solid propellant taking polyester-butyl hydroxyl block polymer as adhesive

A solid propellant, butylated hydroxy block technology, applied in the field of rocket propellants, can solve the problems such as the melting characteristics of block polymers that have not been studied, the incompatibility of block polymers with plasticizers, and the poor mechanical properties of propellants. , to achieve the effect of improving low vulnerability performance, improving slow baking characteristics, and improving melt fluidity

Active Publication Date: 2020-04-07
HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The block polymer with this structure cannot be compatible with the plasticizer in the butyl-hydroxyl system, nor can it match the bonding agent of the butyl-hydroxyl system, and it will also lead to poor mechanical properties of the propellant, which is not suitable for the existing butyl-hydroxyl system
[0007] In summary, it can be seen that there are few research reports on polyester-butylene hydroxyl block polymers at home and abroad, and domestic research mainly focuses on the synthesis of block polymers, and its application in propellants has not yet been carried out; However, foreign research mainly focuses on higher polar block polymers, which are suitable for high-energy propellants with low solid content and high plasticizing ratio, but not for the existing butylated hydroxyl system, and have not been studied at home and abroad. Melting properties of block polymers and their possible impact on propellant slow-bake performance

Method used

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  • Solid propellant taking polyester-butyl hydroxyl block polymer as adhesive
  • Solid propellant taking polyester-butyl hydroxyl block polymer as adhesive
  • Solid propellant taking polyester-butyl hydroxyl block polymer as adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A kind of solid propellant, take polyester-butylene hydroxyl block polymer as binding agent, the structure of polyester-butylene hydroxyl block polymer is as follows:

[0034]

[0035] The propellant formula (each component is by mass percentage) with this block polymer as binder is as shown in Table 1:

[0036] Table 1 is the propellant formulation of binder with polyester-butylene hydroxyl block polymer

[0037]

[0038] The solid content of the propellant with the above-mentioned energetic plasticizer and the polyester-butylene hydroxyl block polymer as the binder is as high as 87%, and the propellant process performance is good, and if the block polymer is replaced by the butylated hydroxyl rubber , The process performance of the propellant is poor, indicating that the energetic plasticizer bis-2,2-dinitrododecyl formal only has good compatibility with block polymers. The mechanical properties and propellant density of the obtained propellants are shown in Ta...

Embodiment 2

[0044] A kind of solid propellant, with polyester-butylene hydroxyl block polymer as binder, its structure is:

[0045]

[0046] The propellant formula (each component is by mass percentage) with this block polymer as binder is as shown in table 3:

[0047] Table 3 is the propellant formulation of binder with polyester-butylene hydroxyl block polymer

[0048]

[0049] In formula 2, the propellant with polyester-butylene hydroxyl block polymer as the binder has a solid content of 86.5%, TDI is used as the curing agent, and it is mixed for 90 minutes at 50°C. The technological properties of the obtained propellant slurry are as follows: Table 4 shows.

[0050] Table 4 Process performance of propellant slurry

[0051] Numbering time, h 1h 3h 5h Recipe 2 η / Pa·s 409.7 493.3 758.0

[0052] It can be seen from Table 4 that the viscosity of the propellant after heat preservation at 50°C for 5 hours is only 758 Pa·s, which can meet the needs of exp...

Embodiment 3

[0058] A kind of solid propellant, with polyester-butylene hydroxyl block polymer as binder, its structure is:

[0059]

[0060] The propellant formula (each component is by mass percentage) with this block polymer as binder is as shown in table 6:

[0061] Table 6 is the propellant formulation of binder with polyester-butylene hydroxyl block polymer

[0062]

[0063] The solid content of formula 3 is 85.5%, and the mechanical properties of the obtained propellant are shown in Table 7.

[0064] Table 7 takes polyester-butylene hydroxyl block polymer as the mechanical property of the propellant of binding agent

[0065]

[0066] It can be seen from Table 7 that the mechanical properties of the propellant are excellent, and the elongation at room temperature, high temperature and low temperature is all greater than 45%, which can meet the needs of practical applications.

[0067] In addition, the state of the film made of this block polymer after heating to 400°C is a...

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Abstract

The invention provides a solid propellant formula taking a polyester-butyl hydroxyl block polymer as an adhesive. The structure of the polyester-butyl hydroxyl block polymer is clarified, a polyester-hydroxyl block polymer is used for replacing hydroxyl-terminated butadiene rubber in a hydroxyl-terminated butadiene propellant as an adhesive, and all components and contents in the propellant are optimally designed, so that the propellant can keep good compatibility with an energetic plasticizer while keeping good process, mechanical properties and high solid content of the hydroxyl-terminated polybutadiene propellant, thereby the energy performance of the propellant is improved. The polyester-butyl hydroxyl block polymer is used as the adhesive, so that the fluidity of an adhesive melt is remarkably improved, holes and cracks generated by AP decomposition in the propellant can be filled up, and the propellant can pass a low-speed baking test to meet the requirement of low vulnerabilityof the propellant.

Description

technical field [0001] The invention generally belongs to the technical field of rocket propellants, and in particular relates to a solid propellant for charge of a solid rocket motor. Background technique [0002] Butylated hydroxy propellant has become the most widely used propellant variety in solid rocket motors at home and abroad because of its excellent mechanical and process properties and moderate cost. However, due to the low polarity of the HTPB adhesive itself, it cannot be compatible with energetic plasticizers such as nitrate esters, which restricts the further improvement of its energy performance. In addition, due to the poor fluidity of the molten liquid of the hydroxybutylated binder, it is impossible to fill the holes that appear when ammonium perchlorate is decomposed at low temperature, resulting in a severe detonation response of the hydroxybutylated propellant in the slow cook-off test, so Hydroxybutylene propellant also failed the slow cook-off test a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C06D5/06C06B23/00
CPCC06B45/105C06D5/06
Inventor 李爽石玉婷唐超凡子侯斌李忠友胡期伟张晨孟嘉鑫
Owner HUBEI INST OF AEROSPACE CHEMOTECHNOLOGY
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