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Polyazidoglycidyl ether cross-linked by triazoline bond and preparation method thereof

A glycidyl ether and triazoline bond technology, which is applied in the field of energetic materials, can solve the problems that the comprehensive mechanical properties cannot meet the application requirements and the overall mechanical properties are poor, and achieve the effect of good mechanical properties and improved mechanical properties.

Active Publication Date: 2020-10-27
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to completely react the alkynyl group and the azide group to obtain an adhesive with a high degree of crosslinking, a certain amount of catalyst (such as cuprous salt) needs to be added, and its comprehensive mechanical properties are difficult to meet the application requirements.
For example, Ding et al. studied terminal group modified in "Structure and mechanical properties of novelcomposites based on glycidylazide polymer and propargyl-terminated polybutadiene as potential binder of solid propellant" Journal of Applied Polymer Science, 2014, 131(7):40007-40015 HTPB and GAP prepared thermosetting azide adhesive by click chemical reaction, when the maximum tensile strength was 2.53MPa, the corresponding elongation was only 47.6%; when the maximum elongation was adjusted to 81.6%, the corresponding tensile strength was only 0.33MPa, the overall mechanical properties are poor

Method used

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  • Polyazidoglycidyl ether cross-linked by triazoline bond and preparation method thereof
  • Polyazidoglycidyl ether cross-linked by triazoline bond and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a 250mL three-necked flask equipped with a mechanical stirrer, a thermometer and a reflux device, add 80g (40mmol) of GAP with a relative molecular weight of 2000, and 3.52g (40mmol) of 1,4-butenediol, and heat the system to 60°C. Add 13.94g TDI and 50μL dibutyltin dilaurate under mechanical stirring, continue stirring for 30min until uniform, and then pour into the mold. The mold was placed in a vacuum oven, and air bubbles in the system were removed by circulating vacuum, and the reaction system was reacted at 75° C. for 14 d after nitrogen protection. After the reaction is finished, the film obtained in the mold is taken out, and the polyazide glycidyl ether cross-linked by triazoline bonds is obtained after drying.

[0029] Structure Identification:

[0030] Infrared (KBr,cm -1 ): 2924, 2846, 2099, 1740, 1600, 1532, 1276, 1221, 1135, 1062, 767.

[0031] The above analytical data confirm that the material obtained by this synthesis method is indeed a polyazide ...

Embodiment 2

[0033] In a 250mL three-neck flask equipped with mechanical stirring, thermometer and reflux device, add 80g (80mmol) of GAP with a relative molecular mass of 1000, 16.34g (160mmol) of 2-pentene-1,5-diol, and heat the system to 60 ℃. Add 43.90 g of TDI and 100 μL of dibutyltin oxide under mechanical stirring, continue stirring for 30 min until uniform, and then pour into the mold. The mold was placed in a vacuum oven, the air bubbles in the system were removed by circulating vacuum, and the reaction system was reacted at 65° C. for 28 days after nitrogen protection. After the reaction is finished, the film obtained in the mold is taken out, and the polyazide glycidyl ether cross-linked by triazoline bonds is obtained after drying.

Embodiment 3

[0035] In a 250mL three-neck flask equipped with mechanical stirring, thermometer and reflux device, add 80g (53.33mmol) of GAP with a relative molecular mass of 1500, 3.1g (26.67mmol) of 3-hexene-1,6-diol, and heat the system to 60°C. Add 13.24g TDI and 60μL stannous octoate under mechanical stirring, continue stirring for 30min until uniform, and then pour into the mold. The mold was placed in a vacuum oven, the air bubbles in the system were removed by circulating vacuum, and the reaction system was reacted at 85° C. for 7 days after nitrogen protection. After the reaction is finished, the film obtained in the mold is taken out, and the polyazide glycidyl ether cross-linked by triazoline bonds is obtained after drying.

[0036] Performance test: The thermal decomposition peak temperature of the polyazideglycidyl ether cross-linked by triazoline bonds obtained in Example 1 is 241.2°C, the initial weight loss temperature is 202.3°C, the tensile strength is 6.5MPa, and the el...

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Abstract

The invention relates to a triazoline bond cross-linked GAP (glycidyl azide polymer) and a preparation method thereof, and aims to solve the problem of excessive air bubbles caused by excessive isocyanate in the preparation process of a traditional thermosetting azide binder. The molecular structure of the triazoline bond cross-linked GAP is shown in the description, wherein m, x, y and z are integers and x / y is 0.2-5. The preparation method of the triazoline bond cross-linked GAP comprises the following steps: triazolin bond cross-linked GAP is prepared from GAP as the prepolymer, low molecular enediol as a chain extender and a curing agent and toluene diisocyanate as a coupling agent by chain extension and other reactions. The preparation route of the triazolin bond cross-linked GAP is simple and feasible, and the obtained product has better comprehensive performance.

Description

technical field [0001] The invention relates to a thermosetting azide adhesive, in particular to a polyazide glycidyl ether cross-linked by a triazoline bond, and belongs to the field of energetic materials. Background technique [0002] Thermosetting adhesives based on chemical crosslinking are an important research direction for solid propellants at present, mainly including polyurethane, polyether, carboxyl-terminated polybutadiene and hydroxyl-terminated polybutadiene, etc. The first generation of LOVA propellant is also used this binder. Thermosetting adhesives are easy to cast and have good process performance, and are widely trial-produced in the development of insensitive explosives in various countries. However, there are currently two deficiencies in the binder. One is that the binder is an inert component, which affects the energy of the charge; the other is that during the preparation of the thermosetting binder, it is easy to react and absorb water to form urea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/67C08G18/38
CPCC08G18/3851C08G18/675C08G18/7614
Inventor 徐明辉卢先明莫洪昌刘宁汪伟王晓川张倩卢莹莹
Owner XIAN MODERN CHEM RES INST