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Polyglycidyl ether nitrate (PGN)-based thermoplastic polyurethane elastomer containing Diels-Alder bonds and one-pot preparation method of PGN-based thermoplastic polyurethane elastomer

A thermoplastic polyurethane and elastomer technology, used in offensive equipment, non-explosive/non-thermal agent components, non-explosive fillers/gelling agents/thickeners, etc. To achieve multiple repairs and other problems, to achieve the effect of high energy characteristics and simple preparation methods

Inactive Publication Date: 2020-11-13
XIAN MODERN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the elastomer does not contain energy, and the preparation method is complicated, and it cannot be repaired multiple times, which limits its application in the formulation of explosives and needs further improvement.

Method used

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  • Polyglycidyl ether nitrate (PGN)-based thermoplastic polyurethane elastomer containing Diels-Alder bonds and one-pot preparation method of PGN-based thermoplastic polyurethane elastomer
  • Polyglycidyl ether nitrate (PGN)-based thermoplastic polyurethane elastomer containing Diels-Alder bonds and one-pot preparation method of PGN-based thermoplastic polyurethane elastomer
  • Polyglycidyl ether nitrate (PGN)-based thermoplastic polyurethane elastomer containing Diels-Alder bonds and one-pot preparation method of PGN-based thermoplastic polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a PGN-based thermoplastic polyurethane elastomer containing a Diels-Alder bond, which is prepared according to the following one-pot method:

[0030] In a 100mL three-neck round-bottom flask equipped with mechanical stirring, a thermometer and a reflux device, add dry PGN (4g, 2mmol) with a molecular weight of 2000Da, MDI (3g, 12mmol), 1.2mg of dibutyltin dilaurate and 15mL of anhydrous Chloroform forms a mixed solution. Under a nitrogen atmosphere, the mixed solution was placed in a water bath at 80° C., and mechanically stirred for 2 hours to obtain an isocyanate-terminated polyurethane prepolymer solution. Cool the mixed solution to 60°C, add 1-hydroxymethyl-10-oxatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione-2-aminoethanol (2.4g, 10mmol ), continue to react in a water bath at 80° C. for 4 h under a nitrogen atmosphere. After the reaction was completed, the reaction system was concentrated under reduced pressure, and the yield of the light yellow...

Embodiment 2

[0035] This embodiment provides a PGN-based thermoplastic polyurethane elastomer containing a Diels-Alder bond, which is prepared according to the following one-pot method:

[0036] In a 100mL three-neck round bottom bottle equipped with mechanical stirring, thermometer and reflux device, add dry PGN (6g, 2mmol) with a molecular weight of 3000Da, MDI (2g, 8mmol), 1.5mg dibutyltin dilaurate and 14mL anhydrous Dichloroethane forms a mixed solution. Under a nitrogen atmosphere, the mixed solution was placed in a water bath at 85° C., and mechanically stirred for 3 h to obtain an isocyanate group-terminated polyurethane prepolymer solution. Cool the mixed solution to 65°C, add 1-hydroxymethyl-10-oxatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione-2-aminoethanol (1.44g, 6mmol ), continue to react in a water bath at 85° C. for 3 h under a nitrogen atmosphere. After the reaction is finished, the reaction system is concentrated under reduced pressure, and the obtained light yellow elastomer ...

Embodiment 3

[0038] This embodiment provides a PGN-based thermoplastic polyurethane elastomer containing a Diels-Alder bond, which is prepared according to the following one-pot method:

[0039] In a 100mL three-neck round-bottom flask equipped with mechanical stirring, a thermometer and a reflux device, add dry PGN (8g, 2mmol) with a molecular weight of 4000Da, MDI (1.5g, 6mmol), 1.8mg dibutyltin dilaurate and 16mL no Water and toluene form a mixed solution. Under a nitrogen atmosphere, the mixed solution was placed in a 90° C. water bath, and mechanically stirred for 4 hours to obtain an isocyanate-terminated polyurethane prepolymer solution. Cool the mixed solution to 60°C, add 1-hydroxymethyl-10-oxatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione-2-aminoethanol (0.96g, 4mmol ), and continued to react in a water bath at 90° C. for 5 h under a nitrogen atmosphere. After the reaction is finished, the reaction system is concentrated under reduced pressure, and the obtained light yellow elastomer ...

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Abstract

The invention discloses a PGN-based thermoplastic polyurethane elastomer containing Diels-Alder bonds and a one-pot preparation method thereof. The invention aims to solve the problem that polyurethane elastomer is difficult to repair after cracking. The molecular structural formula of the PGN-based thermoplastic polyurethane elastomer containing the Diels-Alder bonds is as shown in the specification. In the formula, n is an integer ranging from 7 to 60, x is an integer ranging from 1 to 6, y is an integer ranging from 5 to 100, and y is an integer. According to the related preparation method,PGN is used as a prepolymer, 1-hydroxymethyl-10-oxabicyclo[5.2.1.02,6]dec-8-ene-3,5-dione-2-aminoethanol is used as a chain extender, diphenylmethane diisocyanate (MDI) is used as a coupling agent, and the PGN-based thermoplastic polyurethane elastomer containing Diels-Alder bonds is prepared through a chain extension reaction one-pot method. The PGN-based thermoplastic polyurethane elastomer containing the Diels-Alder bonds is simple and feasible in preparation route, has a self-repairing function, and has a wide application value in the field of polymer bonded (PBX) explosives.

Description

technical field [0001] The invention relates to a PGN-based thermoplastic polyurethane elastomer containing a Diels-Alder bond, which is suitable for the field of PBX explosives. Background technique [0002] Binder is an important component in the formula of explosives. As a skeleton and matrix, it binds oxidizers, metal fillers and other additive components together, which determines the processing technology, mechanical properties and performance of explosives products. Therefore, the binder’s Development is generally considered to be a sign of the replacement of explosives products. Continuously introducing new polymer binders into propellant and explosives to obtain better comprehensive performance is always the key technology and direction of the development of propellant and explosives. The design and preparation of functional binders has attracted extensive attention of researchers. [0003] John P. Swanson et al (John P. Swanson, Svetlana Rozvadovsky, Jonathan E. S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/50C08G18/32C08G18/10C06B25/34C06B23/00
CPCC06B23/001C06B25/34C08G18/10C08G18/5069C08G18/7671C08G18/3846
Inventor 徐明辉莫洪昌卢先明陈淼刘宁张倩段秉蕙汪伟
Owner XIAN MODERN CHEM RES INST
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