A kind of alkyne-terminated curing agent and preparation method thereof
A technology of terminal alkyne group and curing agent, which is applied in chemical instruments and methods, preparation of organic compounds, preparation of carbamic acid derivatives, etc., which can solve the problem of propellant density decrease, impact on mechanical properties, propellant safety and reliability decline and other problems, to achieve the effect of increasing elongation, improving mechanical strength, and promoting microphase separation
Active Publication Date: 2017-08-08
XIAN MODERN CHEM RES INST
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Problems solved by technology
When GAP is used, it generally forms an isocyanate curing system with a multifunctional isocyanate curing agent, which is cured by the reaction between the terminal hydroxyl group and the isocyanate group. However, the isocyanate curing agent in this type of curing system is highly active and is easy to react quickly with water or protonic acid to generate CO 2 , many air holes are formed during the curing process of the propellant, which reduces the density of the propellant, affects its mechanical properties, and at the same time reduces the safety and reliability of the propellant
Method used
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Embodiment 1
[0026] Add 200ml tetrahydrofuran, 100g (0.25mol) PEG400 and 7.4ml (0.0125mol) dibutyltin dilaurate successively in a 500ml four-neck round bottom flask equipped with mechanical stirring, reflux condenser, thermometer, and dropping funnel, and stir evenly , heated to 40°C, then added 87.08g (0.5mol) of TDI, and reacted at 43°C to 45°C for 6h. Then, 29.4 g (0.525 mol) of propynyl alcohol was added dropwise to the above reaction system, and reacted at 80° C. to 82° C. for 8 hours after the dropwise addition was completed. Cooled to room temperature, extracted with saturated brine, and the upper layer liquid was rotary evaporated and vacuum dried to obtain 193.7 g of a light yellow transparent viscous liquid with a yield of 90.1%.
[0027] Structure Identification: Infrared (KBr,cm -1 ): 3309 (≡C-H), 3067 (C-H on the benzene ring), 2965 (-CH 3 ),2846(-CH 2 ), 2110(C≡C), 1728(C=O), 1107~1115(C-O-C).
[0028] The theoretical number average molecular weight is 860, and the measur...
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Abstract
The invention discloses an alkyne-terminated curing agent, the structural formula of which is as follows: Wherein, n=5-20, which is an integer. The preparation method is as follows: use dibutyltin dilaurate as a catalyst, tetrahydrofuran as a solvent, react hydroxyl-terminated polyethylene glycol with toluene diisocyanate to generate isocyanate-terminated polyethylene glycol, and then add propynyl alcohol to the reaction system for capping reaction , forming an alkyne-terminated curing agent containing a urethane-based polyether chain. The present invention is mainly used for solid propellants.
Description
technical field [0001] The invention relates to an alkynyl-terminated curing agent for a solid propellant, in particular to an alkynyl-terminated curing agent containing a urethane-based polyether chain. Background technique [0002] Azide binders have the advantages of positive heat of formation, fast combustion, high energy, clean gas, good thermal stability and low mechanical sensitivity, and are ideal for high-energy low-signature propellants, gas generators and propellants with high solid content adhesive. A typical representative of the azide binder is azide glycidyl ether (GAP), and GAP has the advantages of the above azide binder. When GAP is used, it generally forms an isocyanate curing system with a multifunctional isocyanate curing agent, which is cured by the reaction between the terminal hydroxyl group and the isocyanate group. However, the isocyanate curing agent in this type of curing system is highly active and is easy to react quickly with water or protonic...
Claims
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IPC IPC(8): C08G65/00C07C269/02C07C271/28C08G73/08C06D5/00
Inventor 李娜赵凤起莫洪昌轩春雷高红旭曲文刚梁勇肖立柏王瑛陈雪莉
Owner XIAN MODERN CHEM RES INST